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Prediction method for NOx generation concentration of 300MW pulverized coal boiler

A prediction method and technology for pulverized coal boilers, which are applied in measurement devices, fuel oil testing, instruments, etc., can solve the problems of not considering the influence of combustion economy, differences, etc., and achieve scientific and reliable results.

Active Publication Date: 2020-06-12
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 prediction method for NOx generation concentration of a 300MW pulverized coal boiler. The prediction method comprises the following steps of firstly, providing the in-boilercoal quality parameters and the unit load; then predicting the NOx generation concentrations of different coal types; predicting the influence of the unit load on the NOx generation concentration; andfinally, predicting the influence of NOx generation concentrations of different coal types under specific loads. The method 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, so that the prediction result is more practical and conforms to the characteristic thatthe load of a power plant fluctuates at any time. Laboratory testing is conducted on the NOx generation concentrations of different coal types under the non-low-nitrogen combustion condition and under the same operation parameter, and the result is more scientific and reliable according to the influence law obtained according to the test result. The method can adapt to anthracite, meager coal, bituminous coal, lignite and other power coals, has a general rule, and also conforms to the actual situation of wide coal blending combustion of the power plant 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 Applications(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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