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DL/T 467-2019: Performance test for pulverizers and pulverizing systems of power station
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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Count Estimation | 78,769 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Older Standard (superseded by this standard) | DL/T 467-2004 | | Quoted Standard | GB/T 474; GB/T 475; GB/T 6075.1; GB/T 17248.3; DL/T 567.5; DL/T 5145; ISO 3966-2008 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | | 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---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
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
Foreword
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 pre...
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