Numerical simulation of NO<sub>x</sub> reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler

BAI Hao; ZHANG Zhongxiao; LI Zixiang; GUO Xinwei; ZHANG Jian; WU Xiaojiang

doi:10.19666/j.rlfd.202212174

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Numerical simulation of NO_x reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler

更新时间：2025-09-28

- Numerical simulation of NO_x reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler
- Thermal Power Generation Vol. 52, Issue 5, Pages: 136-144(2023)
- 作者机构：
  
  1. 上海理工大学环境与建筑学院
  2. 上海交通大学机械与动力工程学院
  3. 华北水利水电大学乌拉尔学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202212174
  CLC： X701
- Published：2023
- 稿件说明：
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BAI Hao, ZHANG Zhongxiao, LI Zixiang, et al. Numerical simulation of NO_x reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler[J]. Thermal power generation, 2023, 52(5): 136-144.
DOI：

BAI Hao, ZHANG Zhongxiao, LI Zixiang, et al. Numerical simulation of NO_x reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler[J]. Thermal power generation, 2023, 52(5): 136-144. DOI： 10.19666/j.rlfd.202212174.

摘要

以330 MW机组煤粉锅炉为研究对象，采用数值模拟方法研究了水煤浆热解气的脱硝作用，重点讨论了主燃区过量空气系数α_1和热解气比例β对炉内燃烧特性和NO_x排放的影响规律。结果表明：当β保持不变时，随着α_1减小，主燃区温度降低，燃尽区及炉膛出口温度升高；同时，α_1的减小增强了主燃区的还原性气氛，有利于提高热解气的脱硝速率，从而降低炉膛出口的NO_x质量浓度，但α_1的减小会影响煤粉的燃烧性能并使得炉膛出口CO增多；随着β的增加，炉膛火焰中心上移，热解气对NO_x的还原速率升高；当β从5%增至20%时，炉膛整体的NO_x质量浓度呈现先减小后增大的趋势，β=15%时NO_x质量浓度最低，热解气的NO_x还原效率为44.35%。

Abstract

The denitrification effect of coal-water slurry pyrolysis gas is investigated by numerical simulation in a 330 MW power station pulverized coal boiler

focusing on the influence law of excess air coefficient α_1 in the primary combustion zone(PCZ) and pyrolysis gas ratio β on the combustion characteristics and NO_x emission in the furnace. The results show that

when β is kept constant

the temperature of the PCZ decreases and the temperature of over-fire air(OFA) zone and furnace outlet increases as α_1 decreases. Meanwhile

the decrease of α_1 enhances the reducing atmosphere in the PCZ

which is beneficial to improve the denitrification rate of pyrolysis gas and thus to reduce the NO_x mass concentration at the furnace outlet. But the decrease of α_1 will affect the combustion performance of the pulverized coal and increase the CO concentration at the furnace outlet. With the increase of β

the center of the furnace flame moves up and the reduction rate of NO_x by pyrolysis gas increases. When β increases from 5% to 20%

the overall mass concentration of NO_x in the furnace shows a trend of first decreasing and then increasing

and when β=15%

the NO_x mass concentration reaches the lowest and the NO_x reduction efficiency of the pyrolysis gas reaches 44.35%.

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Numerical simulation of NOx reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler

DOI：10.19666/j.rlfd.202212174

摘要

Abstract

关键词

Keywords

references

Numerical simulation of NO_x reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler