CN112163383A - Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction - Google Patents

Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction Download PDF

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CN112163383A
CN112163383A CN202011086526.8A CN202011086526A CN112163383A CN 112163383 A CN112163383 A CN 112163383A CN 202011086526 A CN202011086526 A CN 202011086526A CN 112163383 A CN112163383 A CN 112163383A
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耿察民
管诗骈
王亚欧
任少君
陶谦
陈波
杨振
肖杰
岳峻峰
蔡亮
何鹏飞
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Southeast University
Jiangsu Fangtian Power Technology Co Ltd
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Abstract

The invention discloses a coal-fired boiler lowest deep regulation load evaluation method considering coal type and environmental parameter correction, which comprises the following steps: calculating the ignition heat and the volatile component heat release quantity of the coal in the minimum stable combustion test by using the coal quality analysis parameters of the coal in the minimum stable combustion test; calculating the ignition heat and the volatile component heat release quantity of the coal to be solved by utilizing the coal quality analysis parameters of the coal to be solved; calculating the ratio of the heat absorption capacity of the water wall of the lowest stable combustion test and the coal operation condition to be solved; calculating the minimum stable combustion coal supply quantity of the coal to be evaluated according to the ratio of the heat absorption capacity of the water-cooled wall of the minimum stable combustion test and the operation condition of the coal to be evaluated and the obtained ignition heat and the volatile release quantity of the coal of the minimum stable combustion test and the coal to be evaluated; and calculating to obtain the lowest stable combustion electric load of the coal to be obtained. The invention establishes a minimum deep regulation load correction method suitable for various external factor changes on the basis of a minimum deep regulation load reference value, and forms a set of coal-fired generator group deep regulation capability evaluation system serving for power grid dispatching.

Description

Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction
Technical Field
The invention relates to a coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction.
Background
In recent years, with the rapid development of wind and light clean energy, the installed capacity proportion of the coal-fired power generator set in China is continuously reduced, and the installed capacity and the power generation proportion of the clean energy are continuously increased. Because the fluctuation of the clean energy power supply side is large, the large coal-fired unit also needs to have deep peak regulation capability to ensure the stability of the power grid. When the coal-fired unit operates under the deep peak regulation working condition, the operation load of the boiler is low, the boiler deviates from the normal working range, the pulverized coal in the hearth is difficult to catch fire, and even the risk of flameout exists, so that scientific evaluation on the lowest deep peak regulation load of the coal-fired boiler is necessary.
At present, a power generation enterprise usually adopts a field test mode to evaluate the lowest deep regulation load of a unit, but the test cost is high, the period is long, and the test working condition coverage is narrow. However, under the low-load working condition, the coal type and the environmental condition are key indexes influencing the stable combustion of the boiler, and the field test is usually difficult to adapt to the change of the coal type and the environmental parameters, so that the universality and the application range of the evaluation result are limited.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects of the prior art, the invention provides a coal-fired boiler minimum deep-regulation load evaluation method which is adaptive to the change of coal types and environmental parameters and takes coal type and environmental parameter correction into account.
The technical scheme is as follows: in order to solve the technical problems, the invention adopts the technical scheme that:
a coal-fired boiler minimum deep regulation load assessment method considering coal type and environmental parameter correction is characterized by comprising the following steps:
s1, calculating ignition heat and volatile component heat release quantity of the coal in the minimum stable combustion test by using the coal quality analysis parameters of the coal in the minimum stable combustion test;
s2, calculating ignition heat and volatile component heat release quantity of the coal to be solved by using the coal quality analysis parameters of the coal to be solved;
s3, calculating the ratio of the heat absorption capacity of the water wall of the lowest stable combustion test and the coal operation condition to be obtained according to the relationship between the coal quality parameters and the heat absorption capacity of the water wall;
s4, calculating the minimum stable combustion coal supply quantity of the coal to be evaluated according to the heat absorption capacity ratio of the water wall of the minimum stable combustion test and the operation condition of the coal to be evaluated and the ignition heat and the volatile component heat release quantity of the coal of the minimum stable combustion test and the coal to be evaluated obtained in S1 and S2;
and S5, calculating the lowest stable combustion electric load of the coal type to be obtained according to the lowest stable combustion test whole-plant efficiency and the lowest stable combustion coal supply quantity.
In the step S1, in the above step,
the coal quality analysis parameters comprise: air drying base volatile component Vad,1Air-dried base ash Aad,1Receiving base moisture Mar,1And a lower calorific value Qar,net,1；
Ignition heat q of coal in minimum stable combustion testzh1Comprises the following steps:
Figure BDA0002720541060000021
in the formula, tzh1The ignition temperature of the reference coal quality is taken as the ignition temperature of the reference coal quality;
Figure BDA0002720541060000022
and
Figure BDA0002720541060000023
respectively to reach the ignition temperature tzh1Specific heat capacity of hour moisture and dry fuel;
Figure BDA0002720541060000024
and
Figure BDA0002720541060000025
respectively is the initial temperature t0Specific heat capacity of hour moisture and dry fuel;
coal volatile heat release q in minimum stable combustion testv1：
qv1＝α*Qar,net,1；
In the formula, alpha is the portion of the heat released by the gas volatile matters of the coal in the ignition stage in the calorific value: 11 to 20 percent of anthracite and lean coal, 20 to 45 percent of bituminous coal and 45 to 60 percent of lignite.
In the step S2, in the above step,
the coal quality analysis parameters of the coal types to be determined comprise: air drying base volatile component Vad,2Air-dried base ash Aad,2Receiving base moisture Mar,2And a lower calorific value Qar,net,2；
The ignition heat of the coal to be determined is qzh2Comprises the following steps:
Figure BDA0002720541060000026
in the formula，tzh2The ignition temperature of the coal quality to be obtained;
Figure BDA0002720541060000027
and
Figure BDA0002720541060000028
respectively to reach the ignition temperature tzh2Specific heat capacity of hour moisture and dry fuel;
Figure BDA0002720541060000029
and
Figure BDA00027205410600000210
respectively is the initial temperature t0Specific heat capacity of hour moisture and dry fuel;
coal volatile heat release q in minimum stable combustion testv2Comprises the following steps:
qv2＝α*Qar,net,2；
in the formula, alpha is the portion of the heat released by the gas volatile matters of the coal in the ignition stage in the calorific value: 11 to 20 percent of anthracite and lean coal, 20 to 45 percent of bituminous coal and 45 to 60 percent of lignite.
The method for calculating the minimum stable combustion coal supply quantity of the coal type to be obtained comprises the following steps:
Figure BDA0002720541060000031
in the formula, B1The coal feeding amount of the coal to be burned under the working condition of the lowest stable combustion load of the field test is adopted; qs1The heat absorption capacity of the water wall under the lowest stable combustion test working condition is obtained; qs2The heat absorption capacity of the water-cooled wall under the coal operation condition is required to be calculated.
In step S5, the minimum stable combustion electrical load N of the coal type to be obtained is calculated2Comprises the following steps:
Figure BDA0002720541060000032
wherein N is1For adjusting the load base to the lowest depthA quasi value; beta is a protection coefficient set according to the actual condition of the power plant; eta1Setting the whole plant efficiency corresponding to the lowest deep-adjusting load reference value as the reference whole plant efficiency; eta2Setting the environment temperature corresponding to the lowest deep-adjusting load reference value as the reference environment temperature T for the whole plant efficiency corresponding to the coal operation condition to be solved, wherein the whole plant efficiency eta is a parameter related to the environment temperature T1Setting the corresponding environment temperature of the coal type operation condition to be solved as T2，η2＝f(η1,T1,T2)；。
Ignition temperature t of reference coal qualityzh1Or the ignition temperature t of the coal to be determinedzh2The calculation method comprises the following steps: establishing a prediction model of air drying base volatile components, air drying base ash and ignition temperature;
and the prediction model calculates the ignition temperature of the corresponding coal type according to the air drying base volatile component and the air drying base ash component.
The relation between the coal quality parameters and the heat absorption capacity of the water wall is established, and the heat absorption capacity Q of the water wall under the operating conditions of the minimum stable combustion test and the coal type to be solved is calculateds1And Qs2。
The method for establishing the relationship between the coal quality parameter and the heat absorption capacity of the water wall comprises the following steps:
step 1: building a hearth combustion numerical model for simulating actual hearth combustion by the object boiler;
step 2: the method comprises the following steps of collecting not less than 10 common coal types, and testing and collecting the following coal quality parameters of each coal quality, wherein the parameters comprise: industrial analysis parameters, elemental analysis parameters, calorific values, reaction kinetics parameters of volatile matter combustion and reaction kinetics parameters of coke oxidation;
step 3: taking the coal quality parameters obtained at Step2 as boundary conditions, and obtaining the heat absorption capacity of the water-cooling wall by adopting a numerical model at Step 1;
step 4: the numerical calculation results in Step3 are sorted into a database consisting of partial coal parameters and heat absorption capacity, wherein the partial coal parameters comprise volatile components, ash content and heat value in the element analysis parameters;
step 5: establishing a functional relation between the heat absorption capacity of the water wall and the coal quality parameters based on samples in a database in Step 4;
step 6: calculating the water wall heat absorption capacity Q under the minimum stable combustion test and the coal type operation condition to be solved by using the functional relation established by Step5s1And Qs2。
In Step5, a fitting method is adopted to establish a functional relation between the heat absorption capacity of the water wall and the coal quality parameters, and the fitting method is a polynomial, a neural network or a support vector machine.
The method for establishing the air drying base volatile component, air drying base ash and ignition temperature prediction model is polynomial fitting, a neural network or a support vector machine.
Compared with the prior art, the invention has the beneficial effects that:
according to the lowest deep load regulation standard of the coal type used for burning in the field test, the lowest deep load regulation of the coal-fired boiler corrected by the coal type and the environmental parameters can be evaluated, and reference is provided for the deep peak regulation of the field coal-fired boiler.
The invention takes the lowest deep regulation load of the coal type burned in the field test as the reference, and utilizes the known or derived related formula, wherein the parameters in the formula can be obtained by methods such as experience or simulation, and the like, and the lowest deep regulation load of the coal-fired boiler corrected by the coal type and the environmental parameters is obtained by calculation.
Drawings
FIG. 1 is a flow chart of the minimum deep turn load correction method adapted to coal type change according to the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
the invention relates to a coal-fired boiler lowest deep regulation load evaluation method considering coal type and environmental parameter correction, which comprises the following steps:
s1, calculating the ignition heat q of the coal in the minimum stable combustion experimentzh1：
Firstly, testing and calculating the air drying base volatile component, the air drying base ash content and the ignition temperature of at least 10 common coal types, and establishing a prediction model of the air drying base volatile component, the air drying base ash content and the ignition temperature, wherein the model can calculate the ignition temperature of the corresponding coal type according to the air drying base volatile component and the air drying base ash content. The modeling method is not limited to polynomial fitting, neural networks, support vector machines, and the like.
Secondly, setting the lowest stable combustion load or the historical lowest operation load of a field test as a lowest deep regulation load reference value, and acquiring key parameter information under the reference value through a test report, an SIS database and a coal quality test result, wherein the key parameter information comprises the following steps: (a) lowest deep regulation load reference value N1(b) coal quality analysis parameters (air drying base volatile component V) of coal type for combustionad,1Air-dried base ash Aad,1Receiving base moisture Mar,1Lower calorific value Qar,net,1) Setting the coal quality as a reference coal quality, (c) setting the environment temperature corresponding to the lowest deep load regulation reference value as a reference environment temperature T1(d) setting the whole plant efficiency corresponding to the lowest deep load regulation reference value as the reference whole plant efficiency eta1(e) coal supply amount B1。
Finally, the ignition heat q is calculatedzh1：
Figure BDA0002720541060000051
In the formula (I), the compound is shown in the specification,
Figure BDA0002720541060000052
and
Figure BDA0002720541060000053
respectively to reach the ignition temperature tzh1Specific heat capacity of hour water and dry fuel, kJ.kg-1·℃-1；
Figure BDA0002720541060000054
And
Figure BDA0002720541060000055
respectively is the initial temperature t0Specific heat capacity of hour water and dry fuel, kJ.kg-1·℃-1(ii) a The specific heat capacity of the dry fuel can be calculated according to the following formula: c. Cg0.912+0.00067t, bituminous coal: c. Cg0.952+0.001t, brown coal: c. Cg1.08+0.001 t; for coal used in the operation of the unit, the initial temperature of the pulverized coal airflow can adopt the primary air temperature at the outlet of the pulverizing system; for coal types which are not used in the unit operation, the initial temperatures of pulverized coal airflow of lignite, bituminous coal, lean coal and anthracite are recommended to be 60-70 ℃, 70-80 ℃ and 85-90 ℃; air drying base volatile component Vad,1Air-dried base ash Aad,1And receiving base moisture Mar,1The coal quality analysis parameters of the coal type of the known minimum stable combustion experiment are obtained.
S2, calculating the heat release quantity q of volatile components in the minimum stable combustion testv1：
qv1＝α*Qar,net,1
In the formula, Qar,net,1Alpha is the heat q released by the gaseous volatile matters of the coal in the ignition stagevOccupied Qar,netThe portion of (A): 11 to 20 percent of anthracite and lean coal, 20 to 45 percent of bituminous coal and 45 to 60 percent of lignite.
S3, calculating to obtain the ignition heat q of the unit fuel quantity of the coal to be obtained through S1zh2(ii) a Air drying base volatile component Vad,2Air-dried base ash Aad,2And receiving base moisture Mar,2And the coal quality analysis parameters of the coal types to be solved are obtained.
S4, calculating through S2 to obtain the volatile component heat release quantity q of the unit fuel quantity of the coal to be obtainedv2；Qar,net,2The lower calorific value of the coal type is required.
S5, establishing a relation between the coal quality parameters and the heat absorption capacity of the water wall by combining a numerical simulation calculation result and a machine learning method;
and S6, solving the ratio of the heat absorption capacity of the water wall under the minimum stable combustion test and the coal type operation condition to be solved according to the relation between the coal quality parameter and the heat absorption capacity of the water wall in the S5.
S7, calculating the minimum stable combustion coal supply quantity B2 of the coal type to be obtained:
Figure BDA0002720541060000061
in the formula B1The coal feeding quantity q is the minimum stable combustion test working conditionzh1、qv1、qzh2、qv2、Qs1/Qs2Has been calculated from the previous steps.
S8, calculating the lowest stable combustion electric load N of the coal types to be solved2：
Figure BDA0002720541060000062
Where the plant efficiency η is a parameter related to the ambient temperature T, η1Setting the whole plant efficiency and the environment temperature corresponding to the coal operation condition to be solved as eta respectively for the whole plant efficiency corresponding to the lowest deep load regulation reference value, also called the reference whole plant efficiency2And T2Eta is then2＝f(η1,T1,T2) (ii) a Beta is a protection coefficient set according to the actual condition of the power plant.

Claims (10)

1. A coal-fired boiler minimum deep regulation load assessment method considering coal type and environmental parameter correction is characterized by comprising the following steps:
s1, calculating ignition heat and volatile component heat release quantity of the coal in the minimum stable combustion test by using the coal quality analysis parameters of the coal in the minimum stable combustion test;
s2, calculating ignition heat and volatile component heat release quantity of the coal to be solved by using the coal quality analysis parameters of the coal to be solved;
s3, calculating the ratio of the heat absorption capacity of the water wall of the lowest stable combustion test and the coal operation condition to be obtained according to the relationship between the coal quality parameters and the heat absorption capacity of the water wall;
s4, calculating the minimum stable combustion coal supply quantity of the coal to be evaluated according to the heat absorption capacity ratio of the water wall of the minimum stable combustion test and the operation condition of the coal to be evaluated and the ignition heat and the volatile component heat release quantity of the coal of the minimum stable combustion test and the coal to be evaluated obtained in S1 and S2;
and S5, calculating the lowest stable combustion electric load of the coal type to be obtained according to the lowest stable combustion test whole-plant efficiency and the lowest stable combustion coal supply quantity.
2. The coal-fired boiler minimum deep turn load assessment method according to claim 1, characterized in that: in the step S1, in the above step,
the coal quality analysis parameters comprise: air drying base volatile component Vad,1Air-dried base ash Aad,1Receiving base moisture Mar,1And a lower calorific value Qar,net,1；
Ignition heat q of coal in minimum stable combustion testzh1Comprises the following steps:
Figure FDA0002720541050000011
in the formula, tzh1The ignition temperature of the reference coal quality is taken as the ignition temperature of the reference coal quality;
Figure FDA0002720541050000012
and
Figure FDA0002720541050000013
respectively to reach the ignition temperature tzh1Specific heat capacity of hour moisture and dry fuel;
Figure FDA0002720541050000014
and
Figure FDA0002720541050000015
respectively is the initial temperature t0Specific heat capacity of hour moisture and dry fuel;
coal volatile heat release q in minimum stable combustion testv1：
qv1＝α*Qar,net,1；
In the formula, alpha is the portion of the heat released by the gas volatile matters of the coal in the ignition stage in the calorific value: 11 to 20 percent of anthracite and lean coal, 20 to 45 percent of bituminous coal and 45 to 60 percent of lignite.
3. The coal-fired boiler minimum deep turn load assessment method according to claim 2, characterized in that: in the step S2, in the above step,
the coal quality analysis parameters of the coal types to be determined comprise: air drying base volatile component Vad,2Air-dried base ash Aad,2Receiving base moisture Mar,2And a lower calorific value Qar,net,2；
The ignition heat of the coal to be determined is qzh2Comprises the following steps:
Figure FDA0002720541050000021
in the formula, tzh2The ignition temperature of the coal quality to be obtained;
Figure FDA0002720541050000022
and
Figure FDA0002720541050000023
respectively to reach the ignition temperature tzh2Specific heat capacity of hour moisture and dry fuel;
Figure FDA0002720541050000024
and
Figure FDA0002720541050000025
respectively is the initial temperature t0Specific heat capacity of hour moisture and dry fuel;
coal volatile heat release q in minimum stable combustion testv2Comprises the following steps:
qv2＝α*Qar,net,2；
in the formula, alpha is the portion of the heat released by the gas volatile matters of the coal in the ignition stage in the calorific value: 11 to 20 percent of anthracite and lean coal, 20 to 45 percent of bituminous coal and 45 to 60 percent of lignite.
4. The coal-fired boiler minimum deep turn load assessment method according to claim 3, characterized in that: the method for calculating the minimum stable combustion coal supply quantity of the coal type to be obtained comprises the following steps:
Figure FDA0002720541050000026
in the formula, B1The coal feeding amount of the coal to be burned under the working condition of the lowest stable combustion load of the field test is adopted; qs1The heat absorption capacity of the water wall under the lowest stable combustion test working condition is obtained; qs2The heat absorption capacity of the water-cooled wall under the coal operation condition is required to be calculated.
5. The coal-fired boiler minimum deep turn load assessment method according to claim 4, characterized in that: in step S5, the minimum stable combustion electrical load N of the coal type to be obtained is calculated2Comprises the following steps:
Figure FDA0002720541050000027
wherein N is1The lowest deep regulation load reference value is obtained; beta is a protection coefficient set according to the actual condition of the power plant; eta1Setting the whole plant efficiency corresponding to the lowest deep-adjusting load reference value as the reference whole plant efficiency; eta2Setting the environment temperature corresponding to the lowest deep-adjusting load reference value as the reference environment temperature T for the whole plant efficiency corresponding to the coal operation condition to be solved, wherein the whole plant efficiency eta is a parameter related to the environment temperature T1Setting the corresponding environment temperature of the coal type operation condition to be solved as T2。
6. The coal-fired boiler minimum deep turn load evaluation method according to claim 2 or 3, characterized in that: ignition temperature t of reference coal qualityzh1Or the ignition temperature t of the coal to be determinedzh2The calculation method comprises the following steps: establishing a prediction model of air drying base volatile components, air drying base ash and ignition temperature;
and the prediction model calculates the ignition temperature of the corresponding coal type according to the air drying base volatile component and the air drying base ash component.
7. The coal-fired boiler minimum deep-adjustment load assessment method according to claim 4The method is characterized in that: the relation between the coal quality parameters and the heat absorption capacity of the water wall is established, and the heat absorption capacity Q of the water wall under the operating conditions of the minimum stable combustion test and the coal type to be solved is calculateds1And Qs2。
8. The coal-fired boiler minimum deep turndown load assessment method according to claim 7, characterized in that: the method for establishing the relationship between the coal quality parameter and the heat absorption capacity of the water wall comprises the following steps:
step 1: building a hearth combustion numerical model for simulating actual hearth combustion by the object boiler;
step 2: the method comprises the following steps of collecting not less than 10 common coal types, and testing and collecting the following coal quality parameters of each coal quality, wherein the parameters comprise: industrial analysis parameters, elemental analysis parameters, calorific values, reaction kinetics parameters of volatile matter combustion and reaction kinetics parameters of coke oxidation;
step 3: taking the coal quality parameters obtained at Step2 as boundary conditions, and obtaining the heat absorption capacity of the water-cooling wall by adopting a numerical model at Step 1;
step 4: the numerical calculation results in Step3 are sorted into a database consisting of partial coal parameters and heat absorption capacity, wherein the partial coal parameters comprise volatile components, ash content and heat value in the element analysis parameters;
step 5: establishing a functional relation between the heat absorption capacity of the water wall and the coal quality parameters based on samples in a database in Step 4;
step 6: calculating the water wall heat absorption capacity Q under the minimum stable combustion test and the coal type operation condition to be solved by using the functional relation established by Step5s1And Qs2。
9. The coal-fired boiler minimum deep turndown load assessment method according to claim 8, characterized in that: in Step5, a fitting method is adopted to establish a functional relation between the heat absorption capacity of the water wall and the coal quality parameters, and the fitting method is a polynomial, a neural network or a support vector machine.
10. The coal-fired boiler minimum deep turn load assessment method according to claim 6, characterized in that: the method for establishing the air drying base volatile component, air drying base ash and ignition temperature prediction model is polynomial fitting, a neural network or a support vector machine.
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Publication number Priority date Publication date Assignee Title
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CN110161996A (en) * 2019-06-12 2019-08-23 中国大唐集团科学技术研究院有限公司华东电力试验研究院 Method and system for the analysis of power plant units consumption
CN112032711A (en) * 2020-09-28 2020-12-04 西安热工研究院有限公司 Stable combustion burner based on temperature control of precombustion chamber and operation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103216845A (en) * 2013-01-17 2013-07-24 辽宁省电力有限公司电力科学研究院 Deep peak regulation method for thermal power generator set
CN104992028A (en) * 2015-07-17 2015-10-21 华北电力大学（保定） Fossil power generation unit coal blending scheme acquisition method
CN110161996A (en) * 2019-06-12 2019-08-23 中国大唐集团科学技术研究院有限公司华东电力试验研究院 Method and system for the analysis of power plant units consumption
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