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A Prediction Method of Nox Generation Concentration in 300mw Pulverized Coal Boiler

A prediction method and pulverized coal boiler technology, applied in the direction of measuring devices, fuel oil testing, instruments, etc., can solve different problems without considering the impact of combustion economy, achieve a large statistical load range, strong representativeness, and practical prediction results Effect

Active Publication Date: 2022-02-22
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most thermal power plants only consider fuel cost in the coal blending process, and do not consider the impact of NOx emission cost control on fuel economy during the combustion process, which may lead to the selection of false "economic" blending. Formula
When the unit is determined, the concentration of NOx generated during combustion of different coal types (anthracite, lean coal, bituminous coal, and lignite) is different. and impact factor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment example 1

[0032] Specific implementation case 1, prediction of NOx formation concentration of a kind of high ash bituminous coal under 100% load (300MW):

[0033] Step 1: Provide the furnace coal quality parameters and unit load, the furnace coal quality parameters specifically include the total moisture M t ,%, dry basis ash A d ,%, received base volatile matter V ar , % and received base nitrogen content N ar ,%, unit load FH, MW;

[0034] This time the furnace coal M t =5.98%, A d = 37%, V ar =14.62%, N ar =0.74%; unit load FH=300MW;

[0035] Step 2: Predict the NOx concentration of different coal types (anthracite, lean coal, bituminous coal, lignite) NOx-YM, mg / Nm 3 ;

[0036] NOx-YM=(NOx-M t +NOx-A d +3×NOx-V ar +NOx-N ar ) / 4

[0037] =(209.8+299.0+3×268.3+365) / 4=419.7 (1)

[0038] In formula (1):

[0039] NOx-M t Indicates the predicted value of NOx formation concentration of different full-moisture coal types, mg / Nm 3 , see formula (2) for the specific calculat...

specific Embodiment example 2

[0052] Specific implementation case 2, prediction of NOx formation concentration of a kind of high ash bituminous coal under 50% load (150MW):

[0053] Step 1: Provide the furnace coal quality parameters and unit load, the furnace coal quality parameters specifically include the total moisture M t ,%, dry basis ash A d ,%, received base volatile matter V ar , % and received base nitrogen content N ar ,%, unit load FH, MW;

[0054] This time the furnace coal M t =5.98%, A d = 37%, V ar =14.62%, N ar =0.74%; unit load FH=150MW;

[0055] Step 2: Predict the NOx concentration of different coal types (anthracite, lean coal, bituminous coal, lignite) NOx-YM, mg / Nm 3 ;

[0056] NOx-YM=(NOx-M t +NOx-A d +3×NOx-V ar +NOx-N ar ) / 4

[0057] =(209.8+299.0+3×268.3+365) / 4=419.7 (1)

[0058] In formula (1):

[0059] NOx-M t Indicates the predicted value of NOx formation concentration of different full-moisture coal types, mg / Nm 3 , see formula (2) for the specific calculati...

specific Embodiment example 3

[0072] Specific implementation case 3, a kind of low ash content bituminous coal under 75% load (225MW) NOx production concentration prediction:

[0073] Step 1: Provide the furnace coal quality parameters and unit load, the furnace coal quality parameters specifically include the total moisture M t ,%, dry basis ash A d ,%, received base volatile matter V ar , % and received base nitrogen content N ar ,%, unit load FH, MW;

[0074] This time the furnace coal M t =14.9%, A d = 14.18%, V ar =26.41%, N ar =0.87%; unit load FH=225MW;

[0075] Step 2: Predict the NOx concentration of different coal types (anthracite, lean coal, bituminous coal, lignite) NOx-YM, mg / Nm 3 ;

[0076] NOx-YM=(NOx-M t +NOx-A d +3×NOx-V ar +NOx-N ar ) / 4

[0077] =(174.8+203.7+3×157.6+408.4) / 4=315.0 (1)

[0078] In formula (1):

[0079] NOx-M t Indicates the predicted value of NOx formation concentration of different full-moisture coal types, mg / Nm 3 , see formula (2) for the specific ca...

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Abstract

The invention discloses a method for predicting the NOx generation concentration of a 300MW pulverized coal boiler. Firstly, the furnace coal quality parameters and unit load are provided; then the NOx generation concentration of different coal types is predicted; and then the influence of the unit load on the NOx generation concentration is predicted; Finally, the influence of different coal types on the NOx generation concentration under specific loads is predicted; the present invention not only considers the change of coal quality parameters, but also considers the influence of the change of operating conditions under different loads on the NOx generation concentration, making the prediction results more practical , which is also in line with the characteristics of power plant load fluctuations at any time; the NOx formation concentration of different coal types under the same operating parameters under non-low nitrogen combustion conditions was tested in the laboratory, and the results were more scientific and reliable according to the influence law obtained from the test results ; The present invention can adapt to power coals such as anthracite, lean coal, bituminous coal and lignite, has universal rules, and also conforms to the actual situation of mixed combustion of wide coal types in power plants at present.

Description

technical field [0001] The present invention relates to the technical field of prediction of NOx generation concentration of pulverized coal boilers, in particular to a 300MW pulverized coal boiler of Huaneng Yushe Power Generation Co., Ltd. which uses different types of coal (anthracite, Prediction method of NOx generation concentration of lean coal, bituminous coal, lignite). Background technique [0002] According to statistics, 60% of NOx in my country's air pollutants comes from the combustion of coal, and about 5-30kg of nitrogen oxides are produced for every ton of coal burned. Among them, coal for power generation in thermal power plants accounts for 70% of the country's coal consumption. In order to control the emission level of NOx pollutants from coal-fired thermal power plants, China successively issued the "Emission Standards of Air Pollutants for Thermal Power Plants-GB13223-1996", "The Air Pollution Protection Law of the People's Republic of China" (implement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/22G01N33/00
CPCG01N33/222G01N33/0037
Inventor 刘家利姚伟张森杨忠灿
Owner XIAN THERMAL POWER RES INST CO LTD
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