Numerical study on effect of staged oxy-fuel combustion on NO<sub>x</sub> production in wall type tangentially fired boiler

ZHAO Xinghai; BAI Guisheng

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Numerical study on effect of staged oxy-fuel combustion on NO_x production in wall type tangentially fired boiler

更新时间：2025-09-28

- Numerical study on effect of staged oxy-fuel combustion on NO_x production in wall type tangentially fired boiler
- Thermal Power Generation Vol. 46, Issue 5, Pages: 63-68(2017)
- 作者机构：
  
  东北电力大学能源与动力工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.2
- Published：2017
- 稿件说明：
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ZHAO Xinghai, BAI Guisheng. Numerical study on effect of staged oxy-fuel combustion on NO_x production in wall type tangentially fired boiler[J]. Thermal power generation, 2017, 46(5): 63-68.
DOI：

ZHAO Xinghai, BAI Guisheng. Numerical study on effect of staged oxy-fuel combustion on NO_x production in wall type tangentially fired boiler[J]. Thermal power generation, 2017, 46(5): 63-68. DOI：

摘要

针对某电厂超临界660 MW机组墙式切圆燃煤锅炉

通过在空气分级燃烧技术上运用富氧燃烧的方法

对炉内温度场以及NO_x排放特性进行了数值模拟研究。结果表明:在25%、28%、30%富氧工况下

30%富氧工况表现出与电厂实际空气工况运行下良好的一致性

且炉膛火焰充满度更好

比采用空气分级燃烧稳定;再循环烟气中高摩尔分数的CO_2与煤焦反应加剧了还原性气氛

且煤粉气流在还原区停留时间的增大提高了NO_x污染物向N_2的转化

减少了NO_x生成量;墙式切圆燃烧煤粉锅炉采用分级富氧燃烧后炉膛出口NO_x生成量由原来的236 mg/m~3降低为125 mg/m~3

较空气分级燃烧降低了47.03%。

Abstract

Numerical simulation of NO_x emission characteristics for a supercritical 660 MW unit wall type tangentially fired pulverized coal boiler were carried out. The influence of temperature field and NOxconcentration in the furnace were studied by using the method of oxy-fuel combustion in the air staged combustion technology. The results show that

under oxy-fuel conditions with oxygen content of 25%

28% and 30%

the operation situation of the boiler under 30% oxy-fuel condition shows good agreement with that under the actual air condition in the power plant

and the flame fullness and combustion stability is better than that using the air staged combustion. The reaction between the high concentration CO_2 in flue gas recirculation and the char exacerbated the reducing atmosphere

and the increase of residence time of the pulverized coal flow in the reduction zone improves the transformation of NO_x to N_2

thus the NO_x generation is reduced. After the staged oxy-fuel combustion technology is apllied

the NO_x concentration at the furnace outlet reduces by 47.03%

which is from 236 mg/m~3 to 125 mg/m~3.

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Numerical study on effect of staged oxy-fuel combustion on NOx production in wall type tangentially fired boiler

DOI：

摘要

Abstract

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Numerical study on effect of staged oxy-fuel combustion on NO_x production in wall type tangentially fired boiler