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DLT467-2019

Chinese Standard: 'DLT467-2019'
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DL/T 467-2019English1559 Add to Cart Days<=8 Performance test for pulverizers and pulverizing systems of power station Valid DL/T 467-2019
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BASIC DATA
Standard ID DL/T 467-2019 (DL/T467-2019)
Description (Translated English) Performance test for pulverizers and pulverizing systems of power station
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard F24
Classification of International Standard 27.010
Word Count Estimation 78,777
Date of Issue 2019-06-04
Date of Implementation 2019-10-01
Older Standard (superseded by this standard) DL/T 467-2004
Quoted Standard GB/T 474; GB/T 475; GB/T 6075.1; GB/T 17248.3; DL/T 567.5; DL/T 5145; ISO 3966-2008
Drafting Organization Xi'an Thermal Power Research Institute Co., Ltd.
Administrative Organization Electric Power Industry Boiler Standardization Committee
Regulation (derived from) Natural Resources Department Announcement No. 7 of 2019
Summary This standard specifies the principles and methods for performance testing of coal mills and pulverizing systems. This standard is applicable to equipment performance acceptance or performance appraisal, and equipment operation adjustment test of coal mills and pulverizing systems in coal-fired power plants.

DL/T 467-2019
Performance test for pulverizers and pulverizing systems of power station
ICS 27.100
F 24
People's Republic of China Electric Power Industry Standard
Replace DL/T 467-2004
Performance test of coal mill and pulverizing system in power station
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...III
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Superscripts, symbols, units...3
5 Type and performance requirements of pulverizing system...4
5.1 Pulverizing system type...4
5.2 Performance requirements of the pulverizing system...4
6 Test items, content requirements and measuring point layout...5
6.1 Parameters to be tested...5
6.2 Test equipment...5
6.3 Layout of measuring points...6
6.4 Test items...11
6.5 Test Specification...11
7 Organization of the test...20
7.1 Agreement to be reached before the test...20
7.2 Test program...21
7.3 Test conditions...21
7.4 Conduct of the test...22
7.5 Sorting out the original test records...22
7.6 Test data processing...22
7.7 Test report...22
8 Measurement method...23
8.1 Output measurement...23
8.2 Air volume measurement...23
8.3 Wind pressure measurement...30
8.4 Sampling and screening of pulverized coal...30
8.5 Sampling of raw coal...32
8.6 Power measurement...33
9 Error Analysis and Test of Measurement Accuracy...34
9.1 Error elimination...34
9.2 Test of measurement accuracy...34
Appendix A (informative appendix) Principle system diagram of common milling system types...36
Appendix B (informative appendix) Comprehensive table of operation characteristics test of intermediate storage silo pulverizing system of steel ball mill...40
Appendix C (informative appendix) Comprehensive table of performance test of double inlet and double outlet steel ball mill...42
Appendix D (Informative Appendix) Performance Test Comprehensive Table of Medium Speed Coal Mill...44
Appendix E (Informative Appendix) Comprehensive Table of Pure Air Ventilation Characteristics Test of Fan Coal Mill...46
Appendix F (informative appendix) comprehensive table of characteristics test of fan coal mill...47
Appendix G (informative appendix) Atmospheric pressure and humid air density in major cities in China...49
Appendix H (informative appendix) General properties of commonly used gases...50
Appendix I (informative appendix) Viscosity of gas and flue gas...51
Appendix J (Normative Appendix) Standard Tachometer...52
Appendix K (Normative Appendix) Non-standard Tachometer...58
Appendix L (Normative Appendix) Coal Sampling Pipe and System...59
Appendix M (Normative Appendix) Sampling of Pulverized Coal Activities...65
Appendix N (Normative Appendix) Table of Basic Dimensions of Standard Sieves...66
Appendix O (Normative Appendix) Coordinate Chart of Coal Particle Size Distribution...67
Appendix P (Normative Appendix) Wiring Diagram of Power Meter...68
Preface
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
Please note that certain contents of this standard may involve patents. The issuing organization of this standard does not bear the responsibility for identifying these patents.
This standard replaces DL/T 467-2004 "Power Plant Coal Mill and Pulverizing System Performance Test". This standard is in line with DL/T 467-2004
Compared with the editorial changes, the main technical changes are as follows.
⎯ Added three items of fan power, fan power consumption, and pulverized power consumption in Chapter 3 "Terms and Definitions";
⎯ Modified some corner marks and symbols in Chapter 4 "Markers, Symbols and Units";
⎯ Chapter 5 "Pulverization System and Coal Mill Performance Requirements" has been revised. The performance requirements of various types of pulverization systems and coal mills have been revised.
It is requested to be unified, no longer classified by type, and the principle system diagram of the milling system is moved to the appendix (see Appendix A);
⎯ Chapter 6 "Test items, content requirements and measuring point layout" and "Parameters to be tested or recorded" are added;
⎯ Added Chapter 6 "Test items, content requirements and measuring point arrangement", "Testing equipment" section, to test equipment
Made a request
⎯ Chapter 6 "Test items, content requirements and measurement point layout" is revised, and the measurement point layout requirements are focused on "Measurement point layout"
In the first section, clear requirements are put forward for the measurement point layout of the powder-containing pipeline;
⎯ The layout requirements of vibration and noise measuring points in Chapter 6 "Test Items, Content Requirements and Measuring Point Arrangement" have been added;
⎯ Chapter 6 "Test items, content requirements and measuring point layout" is revised, and the test items required for performance testing
According to regulations, the test items are no longer classified according to the type of milling system;
⎯ Modify the method of measuring the amount of steel balls in Chapter 6 "Test items, content requirements and measuring point layout", and supplement the use of chord length
Calculation formula for calculating ball position;
⎯ Chapter 6 "Test items, content requirements and measuring point layout" is revised, and the minimum output test of the medium-speed coal mill is updated.
For clear regulations;
⎯ Added the relevant air volume characteristics test of the direct-blowing pulverizing system in Chapter 6 "Test items, content requirements and measuring point layout"
content;
⎯ Added related content of optimization test in Chapter 6 "Test Items, Content Requirements and Measuring Point Arrangement";
⎯ Added the variable-loading medium-speed coal mill and counter-loading force system in Chapter 6 "Test items, content requirements and measurement point layout"
related information;
⎯ The related content of the dynamic and static combined coarse powder separator in Chapter 6 "Test Items, Content Requirements and Measuring Point Arrangement" has been added;
⎯ Added the thermal primary air volume distribution check and adjustment test in Chapter 6 "Test items, content requirements and measurement point layout",
Related content of pulverized coal distribution adjustment test and air leakage test;
⎯ Added the section "Agreements to be reached before the test" in Chapter 7 "Test Organization";
⎯ Added the two sections "Test Program" and "Test Report" in Chapter 7 "Test Organization",
The preparation of the report put forward requirements;
⎯ Added the section "Experimental Data Processing" in Chapter 7 "Experimental Organization";
⎯ Modified the pure air flow measurement method in Chapter 8 "Measurement Method". According to ISO 3966-2008, the air flow measurement method
The method has been revised accordingly, and the characteristics of the standard lysate tube have been moved to the appendix (see appendix J);
⎯ The sampling method and requirements for the amount of pulverized exhaust gas contained in Chapter 8 "Measurement Methods" have been added, and the sampling of pulverized coal has been more detailed
Provisions;
⎯ Chapter 8 "Measurement Method" is revised, and clear requirements for pulverized coal screening are put forward;
⎯ Added a comprehensive table of performance test of double-in and double-out steel ball coal mill (see Appendix C);
⎯ Added filter cartridge type isokinetic sampling tube and rotating coal pulverized coal sampling tube (see Appendix L);
⎯ Modified the basic size table of the standard test sieve mesh (see Appendix N), and deleted the comparison with the original British and American test sieves.
Added the part with sieve holes greater than 4mm.
⎯ Modified the coordinate map of coal particle size distribution (see Appendix O), redrawn the coordinate map, and added examples.
In this standard, the "logarithmic-linear method to find the average flow velocity" (8.2.5) and the "logarithmic-Chebyshev method to find the average velocity" (8.2.6) in accordance with
Part of ISO 3966.2008 was compiled.
Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix I of this standard are all materials
Sexual appendix.
Appendix J, Appendix K, Appendix L, Appendix M, Appendix N, Appendix O, and Appendix P of this standard are all normative appendices.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Electric Power Industry Boiler Standardization Committee (DL/T C08).
Drafting organizations of this standard. Xi'an Thermal Power Research Institute Co., Ltd., China Datang Group Science and Technology Research Institute Co., Ltd. East China Power
Experimental Research Institute, Datang Environmental Industry Group Co., Ltd., Urumqi Hengsheng Yida Power Technology Co., Ltd.
Drafters of this standard. Jin Zhonghua Zhang Anguo Zhang Fengjing Xiaolei Shi Yongqiang Pan Cunhua Jiang Chengyu Li Tao.
The previous versions of the standard replaced by this standard are as follows.
-DL/T 467-1992 "Coal Mill Test Regulations"
-DL/T 467-2004 "Power Plant Coal Mill and Pulverizing System Performance Test"
Time for the first release of this standard. This standard was first released in.1992, and this is the second revision.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of the China Electricity Council (Baiguang Road, Beijing)
Er Tiao No. 1, 100761).
Performance test of coal mill and pulverizing system in power station
range
This standard specifies the principles and methods for performance testing of coal mills and pulverizing systems.
This standard is applicable to the equipment performance acceptance or performance appraisal and equipment operation adjustment test of coal mills and pulverizing systems in coal-fired power plants.
Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB 474 Coal sample preparation method
GB 475 Commercial coal sampling method
GB/T 6075.1-2012 Mechanical vibration. Measurement and evaluation of machine vibration on non-rotating parts. Part 1.General
GB/T 17248.3-1999 Acoustic machines and equipment emit noise at work locations and other designated locations to emit sound pressure level measurement
Site summary
DL/T 567.5 Fuel test method for thermal power plant Part 5.Determination of fineness of pulverized coal
DL/T 942-2005 Coal powder sampling method of direct blowing pulverizing system
DL/T 5145 Technical Regulations for Design and Calculation of Pulverizing System in Thermal Power Plants
ISO 3966,.2008-07-15 Fluid flow measurement in closed pipes-Velocity area method using pitot tube (Measurement of
fluid flow in closed conduits-Velocity area method using Pitot static tubes)
Terms and definitions
The following terms and definitions apply to this document.
3.1
Fineness of pulverized coal
The percentage of the mass of pulverized coal larger than a certain size in the total mass, the remaining amount after sieving the pulverized coal on a test sieve with a mesh size of x (μm)
It is expressed as a percentage Rx (%). The relationship between pulverized coal fineness Rx and pulverized coal particle size x reflects the distribution of particles in pulverized coal,
It can be expressed by the Rosin-Rammler equation.
3.2
Raw coal sizing
The mass percentage of raw coal particles larger than a certain size before entering the coal mill.
3.3
Recirculated air
In the intermediate storage bin pulverizing system, the exhaust gas returned from the outlet of the pulverizer to the inlet (or outlet) of the coal mill.
3.4
Vent air
The mixture of air (or flue gas-air mixture) and coal powder from the fine powder separator.
3.5
Primary air
The air (or flue gas-air mixture) that transports the pulverized coal into the burner.
3.6
Pebble coal refuse from pulverizer
Gangue, coal particles and iron parts discharged from the medium-speed coal mill.
3.7
Power consumption of pulverizer
Electric power input from the drive unit of the coal mill.
3.8
Power consumption of fan
The electric power input by the driving device of the primary fan, powder exhauster, and furnace smoke fan.
3.9
Power consumption rate of pulverizer
The electric energy consumed by the coal mill for grinding per ton of coal is equal to the actual operating power PM of the coal mill divided by the output power of the coal mill BM, namely.
3.10
Power consumption rate of fan
The electrical energy consumed by the fan, exhaust fan, and flue gas fan for grinding per ton of coal is equal to the sum of the actual operating power of each fan divided by PFan
The coal mill output BM, namely.
When the fan provides air volume for several sets of pulverizing systems at the same time, the test is calculated according to the percentage of the ventilation volume of the test pulverizing system to the total air volume of the fan.
Check the power consumed by the powder making system.
3.11
Power consumption rate of pulverizing system
Grind the electricity consumed by the coal-pulverized system per ton. The power consumption of the pulverizing system is equal to the power consumption of the coal mill, the power consumption of the fan and the power consumption of other equipment
The sum of consumption. The power consumption of other equipment in the pulverizing system may include. EFe for coal feeders, ECla for dynamic separators, and power consumption for sealed fans
ESF, electric air lock power consumption EAL, etc. are equal to the ratio of their actual operating power to the output of the coal mill.
3.12
Air leakage ratio of pulverizing system
In the negative pressure pulverizing system, the air leaking into the system through the system components accounts for the mass share of the total desiccant at the inlet of the system.
3.13
Direct-fired pulverizing system
A system in which the coal pulverizer conveys pulverized coal directly to the burner. Usually includes medium speed coal mill, double inlet and double outlet steel ball coal mill, fan coal mill
(Three-medium drying, two-medium drying) direct blowing powder milling system.
3.14
Storage pulverizing system
The pulverized coal ground by the coal mill is first stored in the pulverized coal silo, and then supplied to the pulverizing system of each burner as needed. According to the powder feeding guide
The difference in quality is divided into an intermediate storage bin type exhaust gas powder feeding system, an intermediate storage bin type hot air powder feeding (furnace smoke drying or hot air drying) powder making system.
3.15
Semi-direct-fired pulverizing system
After the coal pulverized by the coal mill is separated by the fine powder separator, the pulverized coal is directly transported to the burner by the hot air system.
Superscript, symbol, unit
4.1 Corner mark
In this standard, the commonly used angle labels and their meanings are shown in Table 1.
4.2 Symbols and units
In this standard, the commonly used symbols and their meanings and units are shown in Table 2.
Pulverizing system type and performance requirements
1.1 Type of pulverizing system
Common types of pulverizing system include steel ball coal mill intermediate storage bin hot air pulverizing system, steel ball coal mill intermediate storage bin exhaust gas delivery
Pulverizing system, steel ball coal mill intermediate storage bin furnace smoke drying hot air pulverizing system, double inlet and double outlet steel ball mill direct blowing pulverizing system
System, medium-speed coal mill direct blowing cold primary air mechanism pulverization system, medium speed coal mill direct blowing type hot primary air mechanism pulverization system, fan coal mill three
Medium drying direct blowing pulverizing system, fan coal mill two medium drying direct blowing pulverizing system, double inlet and double outlet steel ball mill semi-direct blowing system
The principle system diagrams of the powder system are shown in Appendix A, Figures A.1~A.9.
1.2 Performance requirements of the milling system
The performance of the pulverizing system should meet the following requirements.
a) Under the design conditions, when grinding the design coal, the output of the coal mill should reach the guaranteed value, and the lifting head of the fan coal mill should be the same
Time to meet the design requirements.
b) The fineness and uniformity of pulverized coal should meet the design requirements.
c) The electrical consumption of coal mills, fans, and other equipment should not exceed the guaranteed value.
d) The noise and vibration of the coal mill should not be higher than the guaranteed value.
e) The outlet air volume and air temperature of the coal mill should meet the design requirements.
f) The air volume and distribution of pulverized coal in each powder feeding pipeline should meet the design requirements.
g) The intermediate storage bin type pulverizing system of the steel ball coal mill. The coal mill should be operated under the best ventilation.
h) For medium-speed coal mills, the discharge of gravel coal or the calorific value of gravel coal should not exceed the guaranteed value or the provisions of 6.5.10.3 of this standard.
i) For the steel ball mill intermediate storage bin hot air powder feeding system, the steel ball mill intermediate storage bin furnace smoke drying hot air powder feeding system
For pulverized system, double-inlet and double-outlet steel ball mill semi-direct blowing pulverizing system, the three-time air volume should not exceed the design value.
j) For the intermediate storage type steel ball mill furnace smoke drying hot air powder feeding system, the ventilation volume of the two sets of fine powder separators should be balanced.
Test items, content requirements and measuring point layout
1.3 Parameters to be tested
The performance test of coal mill and pulverizing system should test the following parameters, which can be selected according to different test items, test purposes, and test requirements
Select some test parameters or add other test parameters.
a) Coal mill output. obtained from the calibrated coal feeder's coal supply (see 8.1 of this standard).
b) Raw coal particle size. obtained by sampling and screening raw coal.
c) Moisture of raw coal. obtained by sampling and analysis of raw coal.
d) The grindability index of raw coal. It is obtained by sampling and testing raw coal.
e) Moisture of pulverized coal. obtained by analysis of pulverized coal sampling.
f) Fineness of coal powder. obtained by sampling and sieving coal powder.
g) The amount of pulverized coal in the pulverized coal delivery pipeline at the outlet of the coal mill. calculated by sampling and weighing the pulverized coal.
h) The air volume of the powder feeding pipe at the outlet of the coal mill. measure the dynamic pressure in the pipe on the powder feeding pipe at the outlet of the coal mill through the calibrated speed measuring element
Calculated.
i) Ventilation volume of pulverizing system. measured by actual measurement or calibrated air volume measurement device.
j) Desiccant (hot air or flue gas) temperature. Obtained by on-site meter recording or actual measurement.
k) Ambient air temperature and humidity. measured by a dry and wet bulb thermometer.
l) Cold air temperature. Obtained by on-site meter recording or actual measurement.
m) The temperature at the inlet of the coal mill (air or flue gas mixed). It is recorded by an on-site meter or actually measured.
n) Raw coal temperature. measured with a thermometer.
o) The temperature of the air and powder mixture at the outlet of the coal mill. It is recorded by an on-site meter or actually measured.
p) Loading force of medium-speed coal mill. Obtained by on-site meter recording.
q) The amount of pebble coal or the calorific value of pebble coal. calculated by weighing the pebble coal discharged for a period of time, if the amount of pebble coal exceeds the grinding coal
For 0.05% of the rated output of the machine, the pebble coal should be sampled by shrinkage, and the calorific value of the pebble coal should be obtained by laboratory analysis.
r) Steel ball loading capacity. calculated by measuring the volume of steel balls in the mill or by weighing all the steel balls installed.
s) Coal pulverizer material level. obtained through on-site meter records.
t) Vibration of coal mill. measured by vibration meter.
u) Noise of coal mill. measured by sound level meter.
v) Opening degree of each air door. Obtained by recording on site meter.
w) The static pressure of the inlet and outlet of main equipment such as coal mill, fan, coarse powder separator, fine powder separator (dust collector). measured by on-site meters
Recorded or actually measured.
x) Working current of coal pulverizer, fan and other equipment. Obtained through on-site meter records.
y) The power of coal mills, fans, coal feeders, coarse powder separators, electric air locks and other equipment. measured by power meters or electric energy meters
get.
1.4 Test equipment
a) Coal powder sampling device. used for coal powder sampling. Select the appropriate pulverized coal sampling device according to 8.4.2.The pulverized coal sampling device should be compared
Pair inspection.
b) Micromanometer. used to measure the gas flow pressure and static pressure, and should be within the validity period of the inspection.
c) Pitot tube. used to measure air flow pressure and static pressure.
d) Backrest tube. used to measure the dynamic pressure of the powder-containing air flow. Pitot tube is used for calibration at the actual measuring point.
e) Thermometer. used to measure the temperature of the airflow, calibrated thermocouple or glass tube thermometer with appropriate range.
f) Test sieve. used for sieving coal samples and raw coal samples. For raw coal screening, the sieve aperture should be selected according to the test requirements. for
For pulverized coal screening, the sieve aperture and number of the test sieve shall be selected according to the requirements of 8.4.4.Should be within the validity period of the inspection.
g) Balance. used for weighing coal samples, with an accuracy of not less than 0.01g. Should be within the validity period of the inspection.
h) Vibration meter. used to measure the vibration of the coal mill. Measurable displacement (peak-peak value), speed (root mean square value), and the lowest
The response frequency is not more than 10Hz. Should be within the validity period of the inspection.
i) Sound level meter. used to measure the noise of coal mills. The accuracy is above level II, and the sensitivity error is not more than 0.5dB(A). Should be inspected
Validity period.
j) Power meter. used to measure the actual power of coal mills, fans and other equipment. Should be within the validity period of the inspection.
k) Stopwatch. used for timing during sampling. If the number of rotations of the armature of the electric energy meter is used to measure the power, a stopwatch is used for timing.
l) Tape measure. used to measure the size of pipes, the amount of steel balls in the steel ball mill, etc.
m) Scale. used to weigh raw coal when the coal feeder is calibrated.
n) Sample container. used to seal and preserve coal powder and raw coal samples.
1.5 Layout of measuring points
1.5.1 Setting of wind measuring hole
6.3.1.1 For circular pipes, when the upstream straight section of the air measurement point (D is the equivalent diameter of the measured pipe), the downstream straight section,
And when there is no local resistance element such as air damper, only one measuring hole can be opened, and the pre-calibrated representative point can be used
Method of measurement. If the above straight section conditions are not met, 2 to 3 measuring holes (evenly distributed along the circumference) should be opened.
6.3.1.2 For rectangular pipelines, the upstream straight section and downstream straight section should be selected as long as possible to install the measuring points.
6.3.1.3 The setting of measuring points on the measuring section shall be carried out according to 8.2.5 or 8.2.6.
1.5.2 Setting of static pressure measuring points
At the static pressure measuring point, the upstream straight section L1≥10D (D is the equivalent diameter of the pipe under test), the downstream straight section L2≥3D, one static pressure measuring point can be arranged
When the straight sections on the upstream and downstream sides of the static pressure measuring points are not long enough, no less than 2 static pressure measuring points should be arranged along the circumference of the pipeline;
At least 4 static pressure measuring points shall be arranged in the circumferential direction of the variable cross-section pipe. Each point shall be measured separately and then the average value shall be calculated, and the three-way connection shall not be used.
Measure after connection.
1.5.3 Setting of measurement points for pulverized coal sampling
6.3.3.1 The length of the straight pipe section (elbow, shrink tube, diffuser, baffle, etc.) of the upstream side of the sampling point is L1≥10D (D
Is the equivalent diameter of the pipe under test), the downstream straight section L2≥3D. When meeting the above requirements, the number of openings on the same circular section is 2 (complementing each other
90°). If the above requirements cannot be met, the number of openings on the same circular section should be 3 (120° mutually). Take on the same circular section
The sample points are divided according to the method of air volume measurement. When a rotary sampling device is used, the number of holes in the same circular section is one.
6.3.3.2 The sampling point of pulverized coal shall be avoided where there is eddy current in the pipeline.
6.3.3.3 The sampling and measuring points of the same coal pulverizer shall be arranged in similar positions.
6.3.3.4 The air flow measurement point or the pulverized coal sampling point on the powder feeding pipeline at the outlet of the coal mill should be arranged on the vertical pipeline as far as possible. When the vertical tube
When the road does not have a suitable location, it can be arranged on a shorter horizontal pipeline under the premise of meeting the requirements of measuring straight pipe sections, and measures should be taken to eliminate
In addition to the coal dust deposited at the bottom of the pipeline.
1.5.4 Vibration measuring point setting and vibration measurement
6.3.4.1 The layout of the vibration measuring points of the medium-speed coal mill is shown in Figure 1.The measuring points should be a flat metal surface.
Arrange 3 or more measuring points in the circumferential direction of the coal mill.
6.3.4.2 The measurement of vibration refers to the national standard "Mechanical Vibration Measurement and Evaluation on Non-rotating Parts Part 1.General Rules"
(GB/T 6075.1-2012). The vibration of the coal mill belongs to medium and low frequency vibration, and the displacement (peak-to-peak value) or velocity value (root mean square value) should be selected
As a vibration measurement. During the test, keep the measuring probe perpendicular to the measuring surface when measuring, the pressure should be between 5N~20N,
Each measuring point is continuously measured for more than 15s, and the maximum reading displayed by the vibrometer is recorded as the vibration value of the measuring point as the judgment basis, and recorded
Its measurement location.
6.3.4.3 In the performance test of the coal pulverizer, the vibration measurement of the coal pulverizer is carried out under the conditions of maximum output, common output and minimum output of the coal pulverizer.
The vibration measurement value of each measurement point of the coal mill bottom plate shall not exceed the design value, and the measurement points of other parts shall have no obvious abnormality.
Description.
1-- The base of the outer end of the motor (vertical); 2--The bottom plate of the coal mill (vertical); 3--coupling bearing box (vertical);
4--Coupling bearing box (horizontal); 5--motor base (vertical); 6-motor base (horizontal);
7--Mill body support (horizontal); 8--coal mill shell (horizontal)
Figure 1 Vibration measuring point layout of medium-speed coal mill
1.5.5 Noise measurement point setting and noise measurement
6.3.5.1 The noise measuring point should be arranged at a distance of 1m from the shell of the coal mill, and the height should be 1.55±0.075m from the ground. If there is a wall near the coal mill,
The distance between the measuring point and the wall should be greater than 1.5m, and at least 4 measuring points should be arranged to measure with a sound level meter (for medium-speed coal mills, refer to Figure 2),
According to needs, more measuring points can be arranged around the coal mill.
6.3.5.2 The noise measurement is based on the national standard "Acoustic Machinery and Equipment Emitted Noise Working Position and Other Specified Position Emitted Sound Pressure
The Simple Method of Level Measurement Site" (GB/T 17248.3-1999). During the test, the pickup probe is placed at the measuring point and the tester
The operator should be behind the measuring point and ensure that the distance to the probe is greater than 0.5m. Each measuring point is continuously measured for more than 15s, and the maximum noise sound pressure
The level is recorded as the noise sound pressure level of the measuring point, and its measuring position is recorded. Each working condition should be measured more than 3 times, and each measuring point should be measured multiple times
The average sound pressure level is used as the measured value of the measuring point.
6.3.5.3 The background noise of each measuring point shall be measured separately under the conditions that the tested coal pulverizer is out of operation and other equipment is in the same operating state.
If the background noise sound pressure level is less than the measured noise sound pressure level by more than 10dB, no correction is needed; if the sound pressure of the noise and background noise is measured
The level difference is between 3~10dB. According to the above standard, the measured sound pressure level is corrected for the background noise of each measuring point, that is, the measured value is reduced.
Figure 2 Layout of the noise measurement points of the medium-speed coal mill
6.3.5.4 During noise measurement, the output of the coal mill should be about 80% of the maximum output; or the agreed output, such as maximum output and no-load conditions.
Under normal use and the working conditions corresponding to the maximum noise output, etc.
1.6 Test items
6.4.1 The performance evaluation test of the pulverizing system shall be based on the specific conditions of the pulverizing system and the requirements of the contract and technical agreement. Specific test items shall be set up.
The test items should cover all the assessment indicators.
6.4.2 For the performance test of the intermediate storage bin pulverizing system of the steel ball coal mill, the following test items should be carried out.
a) Pulverizing system output characteristic test
b) Performance test of coarse powder separator
c) Efficiency test of fine powder separator
6.4.3 For the performance test of the medium-speed coal mill and the double-inlet and double-outlet steel ball coal mill, the following items should be tested.
a) Test of fineness characteristics of pulverized coal
b) Output characteristic test of pulverizing system
6.4.4 For the performance test of the fan coal mill, the following test items should be carried out.
a) Pure air ventilation characteristic test
b) Test of fineness characteristics of pulverized coal
c) Output characteristic test of pulverizing system
6.4.5 For the performance assessment conditions of the pulverizing system and coal mill, repeatability tests should be carried out.
6.4.6 For the optimization and adjustment test of the pulverizing system, the test items shall be set according to the type and specific purpose and requirements of the pulverizing system.
1.7 Test specification
1.7.1 Calibration test of coal feeder
6.5.1.1 In order to accurately test the output of the coal mill, the scraper coal feeder, belt coal feeder, vibration coal feeder, etc. should be calibrated.
If necessary, calibrate the weight type coal feeder to obtain the relationship between the feeder spindle speed (or vibration frequency) and the amount of coal (weighing type feeder).
The coal machine is calibrated with the weight display).
6.5.1.2 The weighing coal feeder can be calibrated with weights, and physical calibration should be carried out in the qualification test of the new equipment.
1.7.2 Calibration test of backrest tube and air volume measuring device
6.5.2.1 When the backrest tube is used to measure the airflow velocity in a dusty state, a calibration test in a pure air state should be carried out. Backrest tube speed system
The calibration of the number should be carried out under at least three different flow rates, and the speed coefficient should be calculated according to formula (48).
6.5.2.2 For the intermediate storage bin type powder making system, it shall be in the pure air state in the inlet pipe, powder feeding pipe, tertiary air pipe and re
Calibrate the flow coefficient of the backrest pipe at the circulation pipe.
6.5.2.3 For the direct-blowing pulverizing system, in order to verify the accuracy of the dial air volume, the display value of the dial air volume should be calibrated and checked.
It must be carried out in a purely ventilated state with at least three different flow rates.
6.5.2.4 For the double inlet and double outlet steel ball coal mill, the calibration of the inlet air volume and bypass air volume of the coal pulverizer shall be carried out.
The ventilation volume is directly measured on the inlet air duct and compared with the value displayed on the dial to obtain the correction coefficient displayed on the dial.
6.5.2.5 For medium-speed coal mills and fan coal mills, the air volume display of the dial coal mill should be compared with the actual measured value to get the display
The correction coefficient between the actual measurement value and the actual measurement value, and the flow coefficient of the coal mill air flow measurement device is corrected. The actual measurement can be
It is carried out on the inlet pipe of the machine or the powder feeding pipe at the outlet of the coal mill. The air volume of the coal mill on the dial shows the flow at the entrance of the coal mill.
The actual measured value is measured on the powder feeding pipe at the outlet of the coal mill, and they have the following relationship.
6.5.2.6 When the flow coefficient of the coal mill air flow measuring device has not been calibrated, the flow coefficient of the coal mill air flow measuring device should be calibrated.
set. The following formula is used to calculate the flow coefficient.
6.5.3.1 Adjust the shrinkage hole (or damper) on the powder feeding pipeline in the cold state so that the relative deviation of the air volume of each powder feeding pipeline is not more than ±5%.
6.5.3.2 The relative deviation of the maximum air volume is calculated as follows.
1.7.4 Pure air ventilation characteristic test of fan coal mill
6.5.4.1 In the purely ventilated state, measure the inlet, outlet and separator outlet pressures of the coal mill, the power of the coal mill under different ventilation rates,
From this, the lifting head, ventilation efficiency and separator resistance of the coal mill under different ventilation rates are calculated. If you want to measure the
The air leakage rate should also be measured at the same time as the inlet air volume of the coal mill, the separator outlet air volume, and the sealing air volume, according to the mass balance described in section 8.2.8
Method to calculate the air leakage rate.
1.7.5 Optimum steel ball loading test of steel ball coal mill
6.5.5.1 When carrying out the best steel ball loading test, all the steel balls in the original coal mill should be poured out and screened according to the steel ball specifications shown in Table 3.
Add steel balls to the ratio or design ratio.
6.5.5.2 Before carrying out the optimal steel ball loading test, the calculation of the optimal steel ball loading should be carried out, and the loading should be added to the calculation of the optimal steel ball loading.
About 80% of the amount, and then gradually add balls to test. The calculation formula for the optimal steel ball loading is as follows.
6.5.5.3 When the trolley is used to add steel balls to the empty mill, it is advisable to actually weigh the steel balls of each trolley to obtain the initial steel ball loading in the mill. Can also pass
The initial steel ball loading is calculated by measuring the ball position of the steel ball in the coal mill. The amount of steel balls increased in subsequent tests shall be carried out for each car of steel balls
Actual weighing.
6.5.5.4 Before the ball position measurement, the coal mill should be rotated to make the steel sphere flat (see Figure 9). Diameter d at journal, spherical surface from lower edge of journal
The distance h should be measured at both ends of the coal mill, d should be measured multiple times on different diameters, the chord length formed on the surface of the steel ball l
Multiple measurements should be taken in the length direction of the coal mill, and the average value shall be taken as the measurement value; using formula (18) and formula (19) to calculate respectively
To the central angle α, the average of the two is used as the final α value, and the absolute deviation between the two should not be greater than 0.05, otherwise the measurement should be repeated.
6.5.5.5 Before adding coal, measure the no-load current of the coal mill under different steel ball loadings, and draw the relationship between the no-load current of the coal mill and the steel ball loading.
The curve.
6.5.5.6 After coal is added, when carrying out different steel ball loading tests, keep the opening degree of the coarse powder separator baffle or the impeller speed unchanged, and the system will work.
The air volume is controlled according to the calculated optimal ventilation volume, and the opening of the hot air door and the recirculation air door is adjusted to keep the outlet temperature of the coal mill unchanged.
Corresponding to the maximum output of the coal mill with the load of the steel ball (with the principle of not blocking the coal mill).
6.5.5.7 Measure the maximum output of the coal mill, current, power of the coal mill and fan, and fineness of coal powder under different steel ball loadings. Will pulverize coal
The output of the mill, the electrical consumption of the coal mill, and the electrical consumption of pulverization are converted to the same pulverized coal fineness, and the output of the coal mill, the electrical consumption of the coal mill, and the pulverizing
The relationship curve between power consumption and steel ball loading. The optimum steel ball loading capacity is the steel ball loading capacity when the power consumption of powder making is the lowest.
6.5.5.8 The relationship between the output of the coal mill and the fineness of the pulverized coal is converted according to formula (22).
6.5.6.1 For the medium-speed coal mill, double-inlet and double-outlet steel ball mill direct-blowing pulverizing system, keep the coal mill output and ventilation constant (about
It is 80% of the rated output and the corresponding ventilation volume), and the fine coal powder is measured at different openings of the folding door baffle of the coarse powder separator or the impeller speed.
Operation of coal mill output, ventilation, coal mill and primary fan power, as well as coal mill inlet and outlet pressure, temperature, stone coal volume, etc.
parameter.
6.5.6.2 For the optimization test of the pulverizing system equipped with a dynamic separator, the pulverized coal fineness characteristic test should be carried out under different output to
Determine the appropriate impeller speed under different coal mill output, and draw the impeller speed-output curve.
6.5.6.3 For the fan coal mill direct-blowing pulverizing system, keep the output of the coal mill unchanged (80% of the rated output of the coal mill).
Measure the fineness of coal powder and the ventilation rate (air volume at the inlet of the coal mill, air volume at the seal and the outlet flow rate of the coal mill) under different baffle openings of the separator.
The temperature and pressure of the inlet and outlet of the machine, the outlet pressure of the separator, the power of the coal mill and other operating parameters.
1.7.7 Performance test of coarse powder separator in middle storage pulverizing system
6.5.7.1 Keep the output and ventilation of the coal mill unchanged (approximately 80% of the maximum output under the optimal steel ball loading and the optimal ventilation),
Measure the resistance of the coarse powder separator and the fine coal at the inlet and outlet of the coarse powder separator under different opening degree of the folding door baffle of the coarse powder separator or impeller speed.
Operating parameters such as the degree of power, the fineness of powder return, the ventilation of the coal mill, the power of the coal mill and the fan power. Calculate the coarse powder separation based on the above measurement
Unit efficiency, cycle rate, pulverized coal uniformity index, pulverized coal fineness adjustment coefficient, pulverized coal uniformity improvement coefficient, electrical consumption of coal mill and fan
Power consumption, and draw the performance curve of the coarse powder separator.
6.5.7.2 The powdered sample under the fine powder separator can be used to replace the coal powder sample at the outlet of the coarse powder separator, and the powdered sample and coarse powder under the fine powder separator can be separated
The coal sample at the outlet of the filter has the following relationships.
6.5.7.3 According to the requirements of 8.4.4, the pulverized coal sample at the inlet of the coarse powder separator and the pulverized coal sample at the outlet of the coarse powder separator (or the pulverized powder under the fine powder separator)
Sample), the powder sample is sieved to obtain the fineness of the coal powder of each powder sample, and the coarse powder separator inlet and the coarse powder separator outlet are calculated.
Coal powder uniformity index.
6.5.7.4 The cycle rate k of the coarse powder separator is the ratio of the amount of powder at the inlet and the outlet of the coarse powder separator.
The powder fineness and powder back fineness are calculated as follows.
6.5.7.5 The pulverized coal uniformity improvement coefficient z is the ratio of the pulverized coal uniformity index at the outlet of the coarse powder separator to the imported pulverized coal uniformity index.
6.5.7.7 The efficiency of the coarse powder separator is the difference between the fine powder removal rate and the coarse powder removal rate of the coarse powder separator, which is also called the comprehensive separation efficiency of the coarse powder separator.
rate.
6.5.7.8 The relationship between the cycle rate of the coal mill and the efficiency of the coarse powder separator (under the condition that the fineness of the outlet and inlet of the coarse powder separator is certain)
As shown in Figure 10.The recommended optimal cycle rate is shown in Table 4.In the performance assessment of the coarse powder separator, in addition to the assessment of coarse powder separation
In addition to whether the resistance of the filter and the fineness of the coal powder meet the requirements, it is also necessary to check whether the cycle magnification meets the requirements of the optimal cycle magnification.
1.7.8 Optimum ventilation characteristic test of middle storage pulverizing system
Under the optimal steel ball loading capacity, try to control the outlet temperature of the coal mill as much as possible, and select the appropriate opening degree of the coarse powder separator baffle or impeller rotation
Choose 4~5 types of air volume to test near the optimal ventilation volume calculation. The output of the coal mill is the maximum output under the corresponding ventilation volume.
The fineness of the powder and the power consumption of the coal mill and the fan are the best ventilation when the sum of the electrical power consumption of the coal mill and the power consumption of the fan is the lowest.
1.7.9 Air volume characteristic test of direct blowing pulverizing system
6.5.9.1 For the medium-speed coal mill direct blowing pulverizing system, maintain the output of the coal mill unchanged, and perform multiple working conditions at the design air volume and its vicinity
The test to test the operating performance of the coal mill, taking into account factors such as coal fineness, pulverized coal uniformity, stone coal displacement, and pulverized power consumption, etc.
Determine the appropriate amount of ventilation at this output. Under several different output, carry out the air volume characteristic test, draw the air volume-output relationship curve,
If necessary, revise the original air-to-coal ratio curve.
6.5.9.2 For the direct-blowing pulverizing system of the double-inlet and double-outlet steel ball mill with bypass air, the output of the coal mill is kept constant, and the bypass is designed
The air volume and its vicinity are tested under multiple working conditions to test the operation performance of the coal mill, taking into account the fineness of the coal, the uniformity of the coal, and the pulverizing
Factors such as power consumption, determine the appropriate bypass air volume for the output. When necessary, the air volume characteristic test can be carried out under several different output,
The original bypass air volume-output curve is revised.
6.5.9.3 The minimum ventilation rate of the coal mill should be able to ensure the normal and stable operation of the coal mill, and the minimum wind speed of the powder feeding pipeline at the outlet of the coal mill can meet
Requirements for pulverized coal transportation.
1.7.10 Test of output characteristics of coal mill
6.5.10.1 For the intermediate storage bin type pulverizing system of the steel ball coal mill, under the optimal steel ball loading capacity, select the appropriate coarse powder separator baffle
Opening degree or impeller speed, keep the outlet temperature of the coal mill and the ventilation rate of the coal mill unchanged (the optimal ventilation rate), under different output (until
The maximum output of the coal mill) to determine the operating performance parameters of the coal mill and the pulverizing system.
6.5.10.2 The output characteristic test of the medium-speed coal mill, the air-to-coal ratio changes according to the given value, and the load force of the coal mill with variable loading force is according to the given value.
The load force curve changes, and the operability of the coal mill and the pulverizing system is measured under different coal mill output (from minimum output to maximum output)
Can parameter.
6.5.10.3 The maximum output of the medium-speed coal pulverizer shall satisfy the differential pressure of the pulverizer, the current of the pulverizer, the outlet temperature of the pulverizer, the amount of pebble coal and the grinding
The requirements of coal mill vibration, that is, the differential pressure and current of the coal mill should not exceed the maximum design value, and the outlet temperature of the coal mill should not be lower than the minimum design temperature.
The amount of pebble coal is not more than 0.05% of the rated output or the calorific value of pebble coal is not more than 6.27MJ/kg, and the vibration of the coal mill floor does not exceed the design limit
When the value is reached, the output that the coal mill can reach is the maximum output of the coal mill.
6.5.10.4 For the minimum output test of the medium-speed coal mill, the minimum ventilation rate (wind
The speed of the powder feeding pipe with the lowest amount should not be less than 18m/s). Under this ventilation rate, gradually reduce the output of the coal mill and detect the vibration of the coal mill
Value, the vibration reaches the maximum allowable vibration value, meanwhile the outlet temperature of the coal mill does not exceed the designed maximum temperature, and the amount of pebble coal is not greater than the rated
0.05% of the output or the calorific value of the stone coal is not more than 6.27MJ/kg, which is considered to be the minimum operating output of the coal mill.
6.5.10.5 Double inlet and double outlet steel ball mill output characteristics test, under the designed steel ball loading capacity and steel ball ratio, in different coal mills
Under the ventilation rate, keep the coal level of the coal mill unchanged, and the output of the coal mill changes with the ventilation rate, and determine the operating performance parameters of the coal mill and the pulverizing system.
The parameters at both ends of the coal mill should be measured and recorded separately.
6.5.10.6 The output characteristic test of the fan coal mill, the fineness of pulverized coal is measured under different output of the coal mill (up to the maximum output), and the outlet is
Air volume, temperature and pressure of coal mill inlet and outlet, separator outlet pressure, coal mill power and other operating parameters. Maximum output of coal mill
The comparison between the lower lifting head and the design conditions shall be carried out according to 6.5.4.2.
6.5.10.7 Under the maximum output working condition, the resistance of the coal mill should be stable, and the outlet temperature of the coal mill and the fineness of coal can meet the requirements.
1.7.11 Efficiency test of fine powder separator
Under the condition of keeping the output of the coal mill and the ventilation of the system unchanged, perform isokinetic sampling on the inlet pipe of the pulverizer. According to the obtained powder
Sample size, calculate the efficiency of the fine powder separator. The calculation formula is as follows.
1.7.12 The characteristic test of the powder feeder of the intermediate storage bin hot air powder feeding system
6.5.12.1 When calculating the relationship between the speed of the powder feeder and the powder feed quantity of the powder feeder, the powder feed quantity of the intermediate storage type hot air powder feeding system
It can be calculated according to the method of heat balance as follows.
6.5.12.2 During the characteristic test of the powder feeder, the speed of the powder feeder is required to be tested from low to high and from high to low respectively to verify
The reproducibility of the powder supply under the same speed.
1.7.13 Loading pressure test of medium speed coal mill
6.5.13.1 Keep the output and ventilation of the coal mill unchanged (approximately 80% of the rated output and the corresponding ventilation), under different loading pressures
Measure coal fineness, coal mill output, ventilation, coal mill and primary fan power, and coal mill inlet and outlet pressure, temperature, stone
The operating parameters such as the amount of coal in order to obtain a more suitable loading pressure to meet the requirements of the coal output. Comparison of coal mill power consumption under different loading pressures
The condition is that the pulverized coal fineness is the same, and when the pulverized coal fineness is different, it should be converted to the same pulverized coal fineness for comparison.
6.5.13.2 For coal mills equipped with a counter-loading force system, the counter-loading force is set according to the designed counter-loading force curve.
Change the load force nearby to test.
6.5.13.3 The relationship between the coal grinding power consumption of the medium-speed coal mill and the fineness of coal is as follows.
6.5.13.4 For the optimization test of the coal mill with variable loading system, the loading force test can be carried out under different output to determine the different output
Draw the characteristic curve of the loading force for the appropriate loading force under the force.
1.7.14 Gap adjustment test between grinding roller and grinding disc of medium speed coal mill
For the medium-speed coal mill with a gap between the grinding roller and the grinding disc, change the setting value of the gap between the grinding roller and the grinding disc, and measure the fineness of coal powder and coal grinding
Machine output, ventilation, coal mill and primary fan power, and coal mill inlet and outlet pressure, temperature, stone coal volume and other operating parameters, get
Determine the proper clearance value based on the operating performance of the coal mill under different clearances.
1.7.15 Single-side operation characteristic test of double-inlet and double-outlet steel ball mill
Stop the coal feed from the coal feeder on one side, keep the ventilation running at full load, and increase the coal feed on the other side...
Related standard:   DL/T 341-2019  DL/T 345-2019
   
 
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