Numerical simulation on low-NO<sub>x</sub> emission in a 600MW unit boiler with staged-air combustion

YANG Jiao; SUN Baomin

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Numerical simulation on low-NO_x emission in a 600MW unit boiler with staged-air combustion

Thermal Power Generation Vol. 43, Issue 10, Pages: 79-84(2014)

更新时间：2025-09-28

- Numerical simulation on low-NO_x emission in a 600MW unit boiler with staged-air combustion
- 作者机构：
  
  1. 北京巴布科克.威尔科克斯有限公司
  2. 华北电力大学电站设备状态监测与控制教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK221
- Published：2014
- 稿件说明：
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YANG Jiao, SUN Baomin. Numerical simulation on low-NO_x emission in a 600MW unit boiler with staged-air combustion[J]. Thermal Power Generation, 2014, 43(10): 79-84.
DOI：

YANG Jiao, SUN Baomin. Numerical simulation on low-NO_x emission in a 600MW unit boiler with staged-air combustion[J]. Thermal Power Generation, 2014, 43(10): 79-84. DOI：

摘要

某600MW机组四角切圆锅炉在满负荷运行方式下NOx排放浓度约400mg/m3

不能满足国家对电站锅炉NOx减排的要求。对此

采用高级复合式空气分级低NOx燃烧技术和炉膛布置相匹配的方法

降低NOx排放量。同时

以数值模拟软件FLUENT为工具

采用k-ε双方程模型

对燃烧器拟改进结构与原始结构锅炉煤粉燃烧过程和NOx生成特性进行模拟并对比。结果表明:采用空气分级燃烧后

炉膛温度场、速度场以及CO、O2的排放量均有相应的变化

且NOx排放量大大降低;数值模拟结果和试验结果的计算误差在5%以内

可准确预测燃烧器改进后NOx生成与排放量

为燃烧器的改造提供一定的理论依据。

Abstract

The NOxemitted from a 600 MW unit tangentially fired boiler at full load had a high concentration of about 400mg/Nm3

which can't meet the national requirements of NOxemissions for the utility boilers.Thus

the method combining the advanced hybrid air-staged low-NOxcombustion technology with furnace arrangement was applied to reduce the NOxemission.In addition

by the Fluent software and the realizable k-εmodel

comparison of NOxemissions and pulverized coal combustion process between the original burner structure and the being improved ones was conducted.The flue gas temperature field

velocity field and concentration distribution of CO

O2 and NOxaround the burner area were obtained.The results show that the staged-air combustion can reduce NOx emissions obviously and make the furnace temperature field

velocity field

CO and O2 concentration change correspondingly.The calculation error between the numerical simulation results and the experimental data was less than 5%

indicating the numerical simulation can predict the NOxformation and emission accurately

which provides some theoretical basis for the burners design and operation.

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Numerical simulation on low-NOx emission in a 600MW unit boiler with staged-air combustion

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摘要

Abstract

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Numerical simulation on low-NO_x emission in a 600MW unit boiler with staged-air combustion