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DL/T 1976-2019: Technical specification of fuel trial burn test for semi-industrial pilot-plant circulating fluidized bed boiler
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Technical specification of fuel trial burn test for semi-industrial pilot-plant circulating fluidized bed boiler
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DL/T 1976-2019
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Basic data | Standard ID | DL/T 1976-2019 (DL/T1976-2019) | | Description (Translated English) | Technical specification of fuel trial burn test for semi-industrial pilot-plant circulating fluidized bed boiler | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F24 | | Classification of International Standard | 27.060 | | Word Count Estimation | 11,171 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 212; GB/T 213; GB/T 214; GB/T 219; GB/T 474; GB/T 475; GB/T 477; GB/T 1574; GB/T 2565; GB/T 3286; GB/T 10184; GB/T 13283; GB/T 16157; DL/T 465; DL/T 568; DL/T 964 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the fuel test burning test method for semi-industrial circulating fluidized bed (circulating fluidized bed, CFB) boiler combustion test bench (hereinafter referred to as "CFB combustion test bench"). This standard is applicable to the fuel test burning test of CFB combustion test benches with a thermal power of 1MW and above, and CFB combustion test benches for other purposes can be implemented by reference. | DL/T 1976-2019: Technical specification of fuel trial burn test for semi-industrial pilot-plant circulating fluidized bed boiler
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Technical specification of fuel trial burn test for semi-industrial pilot-plant circulating fluidized bed boiler
DL/T 996-2019
ICS 27.060
F 24
People's Republic of China Electric Power Industry Standard
Semi-industrial circulating fluidized bed boiler combustion test bench
Technical specification for fuel trial burning test
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...Ⅱ
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Test equipment and preparations...2
5 Test method and content...5
6 Test data recording and processing...7
7 Test result analysis and report writing...7
Appendix A (informative appendix) test bench test outline..9
Appendix B (informative appendix) the main content of the test report..10
Foreword
This part is drafted in accordance with the rules given in GB/T 1.1-2016 "Guidelines for Standardization Part 1.Standard Structure and Compilation".
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This part was proposed by the China Electricity Council.
This part is under the jurisdiction of the Power Plant Boiler Standardization Technical Committee (DL/T C08).
Drafting organization of this section. China Huaneng Group Clean Energy Technology Research Institute Co., Ltd.
The main drafters of this section. Zhao Pengbo, Gao Hongpei, Sun Xianbin, Xiao Ping, Huang Zhong.
This section is the first release.
The opinions or suggestions during the implementation of this part are fed back to the Standardization Management Center of the China Electricity Council (No. 2 Baiguang Road, Beijing)
One, 100761).
Technical specification for fuel trial burning test of semi-industrial circulating fluidized bed boiler combustion test bench
1 Scope
This part specifies the semi-industrial circulating fluidized bed (Circulating fluidized bed, CFB) boiler combustion test bed (abbreviated as "CFB
"Combustion test bench") fuel trial burning test method.
This part is applicable to fuel test burning test of CFB combustion test bench with thermal power of 1MW and above, and CFB burning test for other purposes.
Bench inspection can be implemented by reference.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all modified versions) applies to this document.
GB/T 212 Coal Industrial Analysis Method
GB/T 213 Method for measuring calorific value of coal
GB/T 214 Method for determination of total sulfur in coal
GB/T 219 Method for measuring coal ash fusibility
GB/T 474 Coal sample preparation method
GB/T 475 Commercial coal sampling method
GB/T 477 Coal screening test method
GB/T 1574 Method for analysis of coal ash composition
GB/T 2565 Coal Grindability Index Determination Method
GB/T 3286 Limestone and Dolomite Chemical Analysis Method
GB/T 10184 Specification for performance test of power station boilers
GB/T 13283 Accuracy level of testing instruments and display instruments for industrial process measurement and control
GB/T 16157 Determination of particulate matter in exhaust from stationary sources and sampling method of gaseous pollutants
DL/T 465 Test method for erosion and wear index of coal
DL/T 568 Quick analysis method for test coal elements
DL/T 964 Circulating fluidized bed boiler performance test specification
3 Terms and definitions
The following terms and definitions apply to this section.
3.1
Bed material
The solid particles with a certain thickness and a certain particle size are laid on the air distribution board before the fluidized bed is ignited. Bed material is generally recycled
Circulating fluidized bed boiler bottom slag or river sand.
3.2
Circulating material
The separator separates the materials returned to the furnace through the return system and the materials accumulated in the furnace itself.
3.3
Fluidized velocity
Assuming that there is no material in the fluidized bed, the air (or flue gas) passing through the empty section velocity of the furnace.
4 Test equipment and preparations
4.1 Test device and system
4.1.1 Refer to Figure 1 for the CFB combustion test bench system. The cross-sectional area of the furnace body should be greater than 0.08m2, in order to ensure sufficient fuel combustion stroke and
The residence time, the effective height of the furnace should be greater than 18m (fluidization velocity 3.5m/s-5m/s). Each section of the combustion chamber (11) should be equipped with temperature adjustment devices (water
The cooling device (7) adjusts the inlet temperature of the separator to achieve a temperature range of 400℃～1000℃ to simulate the actual furnace combustion conditions.
4.1.2 The CFB combustion test bench should be equipped with coal feeding system, air and smoke system, dust collector and cooling water system, etc., to ensure that the test bench has perfect
Features.
4.1.3 The CFB combustion test bench should be equipped with a data acquisition system, and DCS should be used for centralized monitoring.
4.1.4 CFB combustion test bench SNCR denitration reducing agent can be selected in the horizontal flue between the outlet of the combustion chamber (11) and the high temperature separator (13)
Point spray in.
Fig. 1 Reference diagram of CFB combustion test bench system
4.2 Test equipment requirements
4.2.1 The accuracy requirements of CFB combustion test bench test instrument are.
a) Primary air flow meter. accuracy level is 4;
b) Primary wind temperature meter. accuracy level is 2.5;
c) Secondary air flow meter. accuracy level is 4;
d) Secondary air temperature meter. accuracy level is 2.5;
e) The temperature gauge of each section of the furnace wall (the thermocouple is embedded in the furnace wall). the accuracy level is 0.5%;
f) The smoke temperature thermometer for each section (the thermocouple is embedded in the flue). the accuracy level is 0.5%.
The accuracy requirements of other test instruments shall be implemented in accordance with the requirements of GB/T 13283.
4.2.2 The CFB combustion test bench should be equipped with an online flue gas analyzer, which should be able to simultaneously measure the O2, CO2, CO, SO2, NO2, NO, N2O in the flue gas
And other important gas components for measurement. The on-line measuring instrument for flue gas composition should adopt suction sampling method for sampling analysis and measurement. The sampling tube should
Set the heat tracing tube, and the specific sampling method shall be implemented in accordance with GB/T 16157.
4.2.3 According to the needs, the CFB combustion test bench can be additionally equipped with test instruments or flue gas collection equipment. For other flue gas components of the test fuel,
For example, gaseous harmful trace elements and HCl, HF, dioxins, etc. are collected and measured online or sent to the laboratory for testing after sampling.
4.3 Inspection and preparation of test equipment condition
4.3.1 Check that the test device and system have the starting conditions, and record the status of the main equipment components and related auxiliary equipment.
4.3.2 When conducting special combustion tests, the CFB combustion test bench shall complete necessary improvements as required.
4.3.3 Check the related measurement meters and measurement systems of the CFB combustion test bench, and complete the verification and calibration of the necessary test instruments and systems.
4.3.4 Complete preparations for test fuels, desulfurizers (limestone, etc.), denitration reducing agents (urea solution, ammonia, etc.), including testing
The fuel and desulfurizer are prepared into appropriate particle sizes and sampled and analyzed.
4.3.5 Prepare the fuel (gas) required for ignition.
4.3.6 Prepare qualified starting bed material.
4.4 Sampling and testing of test fuel and ash
4.4.1 Sampling and testing of test fuel and limestone shall meet the following requirements
a) After the test fuel arrives at the CFB combustion test bench, multi-point sampling is performed on site. Sampling 2kg at each point and place in a sealed container
In the vessel, after sampling, the quartering method is used to mix and reduce into 4 parts, each 2kg. 1 copy each for the test party and the owner, keep the bottom for future use
2 servings. The specific sampling methods of test fuel, limestone, ash, etc. shall be conducted in accordance with GB/T 474 and GB/T 475.
b) The content of the sample test should include fuel characteristics such as particle size screening, industrial analysis, elemental analysis, calorific value, ash melting point and ash composition
It is also appropriate to use a thermogravimetric analyzer to test the ignition and burnout characteristics of the test fuel. The specific method is
GB/T 212 and GB/T 213 are implemented.
c) Limestone can be sampled in the limestone sample pile into the furnace. The procedure and method of limestone sample reduction are the same as the fuel. Sample transformation
The inspection content should include particle size screening, composition analysis, calcining and decomposition characteristics of limestone, and thermogravimetric analysis of desulfurization characteristics, according to GB/T 3286
carried out.
4.4.2 Sampling and testing of bottom slag and fly ash
The bottom slag is sampled at the bottom slag discharge port of the CFB combustion test bench. The fly ash can be sampled at the bottom of the dust collector or on-line isokinetic sampling.
Use the quarter method to mix down the points. The contents of the test of the ash sample include the combustible content in the ash, particle size screening, ash composition, fly ash specific resistance, etc.
4.5 Arrangement of test conditions
4.5.1 Before the start of the trial burn test, the test conditions should be designed according to the purpose of the test, and the test program should be compiled. See appendix for test program content
A. Determine the parameters to be adjusted for each working condition, and determine the measurement items for each working condition.
4.5.2 The parameters to be adjusted for the CFB combustion test bench mainly include.
a) Test fuel;
b) Blending ratio of different test fuels;
c) bed temperature;
d) The amount of limestone into the furnace (the molar ratio of calcium to sulfur);
e) Ammonia nitrogen ratio of SNCR denitration system.
5 Test method and content
5.1 Start of CFB combustion test bench
5.1.1 Before starting, the CFB combustion test bench has been filled with a certain thickness of bed material. The bed material should be sand with a maximum particle size of less than 1mm or
After screening, the bottom slag with the largest particle size less than 8mm.
5.1.2 Start the fan and ignition system, and proceed with ignition, feeding and heating in sequence. The CFB combustion test bench enters a stable combustion state.
5.1.3 Adjust the relevant test parameters to the predetermined test conditions, and after a certain period of stable operation according to the requirements of the operating conditions, start the normal operating conditions test.
5.2 Test parameter requirements
During the test, the main operating parameters should be kept stable, and their fluctuations should be guaranteed within the range listed in Table 1.During the test,
Operations that interfere with the test should not be performed.
5.3 Test conditions requirements
5.3.1 Test conditions time
The test time should meet the following requirements.
a) After the CFB combustion test bench enters a stable combustion state, it should continue to operate stably for more than 2 hours to perform formal test conditions;
Before the start of each working condition test, it should reach and maintain stable operation for more than 1h under the predetermined test condition parameters;
b) Desulfurization test test conditions, according to the set calcium-sulfur molar ratio, before the start of the test, limestone should be continuously thrown into the furnace for more than 4 hours;
c) SNCR denitration test test conditions, the denitration system should be put into operation stably for more than 1h according to the set ammonia-nitrogen ratio;
d) The test time of each working condition should be no less than 1h. For tests with relatively large parameter fluctuations or more accurate results, the test
The duration should be extended to more than 2h.
5.3.2 Data recording and sampling interval
Test data recording and sampling interval (sampling frequency) should meet the following requirements.
a) Test the main system operating parameters such as fuel input, average bed temperature, operating oxygen, etc., and record once 5min~10min (take DCS
Average of collected data);
b) The primary and secondary air volume, coal sowing air volume, furnace pressure and other secondary operating parameters are recorded once every 30 minutes (take DCS to collect data)
average value);
c) Analysis of smoke composition and exhaust temperature, record once 5min~10min (take the average of DCS collected data);
d) Sampling of the bottom slag, at least once every 60 minutes, and attention should be paid to the lag effect caused by the ash slag stroke;
e) For fly ash sampling, when isokinetic sampling is used, sampling should be continued during the entire test condition;
f) Main running screen, copy the screen every 30min.
5.3.3 Test record
The test data record should include at least the following items.
a) Test name;
b) Working condition number and working condition conditions;
c) Test date and record of abnormal conditions during working conditions;
d) Test start and end time;
e) Test time and detailed data;
f) Other items related to data processing;
g) Recorder, calculator and project leader.
5.4 Test content
5.4.1 Combustion characteristics
Combustion characteristics are one of the most important characteristics of fuel, mainly including.
a) Fire;
b) Stable combustion;
c) Burn out;
d) Coking;
e) Break coal and pressure fire.
5.4.2 Bed temperature distribution characteristics
The test firing test should be carried out under multiple conditions of the bed temperature distribution test, record the test data, and draw the bed temperature along the bed height distribution curve. In cum
Considering NOx, SO2 emission indicators and combustion efficiency, comprehensive analysis recommends the optimal bed temperature range for the design and operation of the CFB boiler.
5.4.3 Pollutant discharge characteristics
The discharge of pollutants shall meet the following requirements.
a) The pollutant emission test requires that the trial burning test should measure the emission value of each pollutant in the flue gas online (special flue gas components can be extracted and sent to
Laboratory analysis), combined with national and local standards, conduct a comprehensive analysis of the pollutant emission data measured in each working condition of the trial burning test,
Recommend appropriate pollutant emission control strategies and measures.
b) SO2 emissions
The trial burning test of the CFB combustion test bench assumes that the total sulfur in the coal is all generated as SO2 during the combustion process, and the corresponding desulfurization efficiency ηs is as follows
The above formula is calculated, including the total desulfurization efficiency including self-desulfurization.
c) NOX emissions
The CFB combustion test bench can be used for fluidized bed flue gas selective non-catalytic reduction (SNCR) denitration test to test the denitrification efficiency and determine
Appropriate ammonia-nitrogen ratio.
d) Emissions of CO, N2O, HCl, HF and other polluting gases and dioxins
Test and test the emission of CO, N2O, HCl, HF and other polluting gases and dioxin emission under various working conditions, and analyze CO, N2O, etc.
The emission of pollutants changes with bed temperature, excess air coefficient and other factors.
5.4.4 Analysis of Ash and Slag Characteristics
The ash and slag produced in the trial burning test shall be analyzed as follows.
a) Ash formation characteristics of test fuel
The trial burning test shall test the proportion of bottom slag and fly ash of the fuel under various working conditions.
b) Analysis of physical and chemical properties and comprehensive utilization of ash
The trial burning test should be based on the actual engineering needs, and the combustible content, ash composition, and particle size of the ash samples obtained in the test under typical conditions should be analyzed.
The analysis of characteristics such as specific resistance of cloth and fly ash provides reference for the design of power plant system and the comprehensive utilization of ash.
6 Test data recording and processing
6.1 For the data of multiple repeated measurements on the CFB combustion test bench, the arithmetic average is generally taken as the final measurement value. Before calculating the average,
The measurement records should be reviewed and analyzed when there are recorded values that differ greatly from the normal readings. In the measurement process, such as the specified working conditions for a short time
When it is damaged and the change of the parameter exceeds the limit range of the operation, all the measurement readings in the affected phase shall be cancelled in the observation record.
6.2 The calculation and processing method of test data shall be carried out in accordance with GB/T 10184 and DL/T 964.
7 Test result analysis and report writing
7.1 After the trial burn test is completed, the trial burn test research report shall be compiled on the basis of collating the test data and analyzing the test results.
Comprehensive analysis and summary of the test results of fuel combustion and pollutant emission characteristics. Refer to Appendix B for the contents of the test report.
7.2 The trial burning test report shall analyze the main factors that affect the combustion of the test fuel and the pollutant emission characteristics, and provide a report on this basis.
Opinions and suggestions when the test fuel is used in the actual project.
Appendix A
(Informative appendix)
Compilation of trial burning test outline
A.1 The test program shall at least include the following contents.
a) Test purpose and task, test content;
b) The condition of the test equipment;
c) Test procedures, measurement items, measurement point layout, test conditions;
d) Technical preparation points of the test, test requirements and implementation;
e) Test data collection and processing methods;
f) Test personnel organization division and overall schedule plan.
A.2 Refer to Figure A1 for the catalogue of trial burn test outline.
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