Experimental investigation on air-staged combustion and NO<sub>x</sub> emission characteristics of lean coal

WANG Yongqiang; ZHOU Yuegui; HAN Jiachen

doi:10.19666/j.rlfd.202103107

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Experimental investigation on air-staged combustion and NO_x emission characteristics of lean coal

更新时间：2025-09-28

- Experimental investigation on air-staged combustion and NO_x emission characteristics of lean coal
- Thermal Power Generation Vol. 50, Issue 11, Pages: 61-67(2021)
- 作者机构：
  
  上海交通大学机械与动力工程学院热能工程研究所
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202103107
  CLC： X701
- Published：2021
- 稿件说明：
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WANG Yongqiang, ZHOU Yuegui, HAN Jiachen. Experimental investigation on air-staged combustion and NO_x emission characteristics of lean coal[J]. Thermal power generation, 2021, 50(11): 61-67.
DOI：

WANG Yongqiang, ZHOU Yuegui, HAN Jiachen. Experimental investigation on air-staged combustion and NO_x emission characteristics of lean coal[J]. Thermal power generation, 2021, 50(11): 61-67. DOI： 10.19666/j.rlfd.202103107.

摘要

采用煤粉燃烧自维持一维试验炉研究了低挥发分贫煤空气分级燃烧和NO_x排放特性

重点研究了空气分级深度、分级燃尽风喷口位置对贫煤燃烧NOx排放的影响

探索能够实现低NO_x排放的空气分级燃烧布置方式。结果表明:随着主燃区过量空气系数αM减小

炉膛出口NO_x质量浓度逐渐降低

当αM为0.70时NO_x还原效率可以达到33.1%;随着分级燃尽风位置比Ms增加

煤粉颗粒在还原区内停留时间延长

炉膛出口NO_x质量浓度进一步降低

并存在一个最佳分级燃尽风位置比;当αM为0.85时

最佳分级燃尽风位置比Ms为0.47

对应的炉内NO_x还原效率为37.7%。

Abstract

A self-sustained one-dimensional experimental furnace for pulverized coal combustion was used to study the characteristics of air-staged combustion and NO_x emission of low-volatile lean coal. The investigation focuses on the influence of air-staged depth and over-fire air(OFA) nozzle position on the NO_x emission

so as to explore the optimal air-staged combustion arrangement to realize low NO_x emission of lean coal. The results show that

the NO_x mass concentration at the furnace outlet gradually decreased with the excess air coefficient αM in the primary combustion zone

and the NO_x reduction efficiency reached 33.1% when αM=0.70. With the increase of OFA nozzle position ratio Ms

the residence time of coal particles in the reduction zone prolonged

the NO_x mass emission further decreased

and there existed an optimal OFA nozzle position ratio. When αM=0.85

the optimal OFA nozzle position ratio was 0.47

and the corresponding NO_x reduction efficiency in the furnace was 37.7%.

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Experimental investigation on air-staged combustion and NOx emission characteristics of lean coal

DOI：10.19666/j.rlfd.202103107

摘要

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Experimental investigation on air-staged combustion and NO_x emission characteristics of lean coal