Effect of mixing ratio of flue gas in primary air on NO<sub>x</sub> generation characteristics in Π-type tangentially fired boiler at low load

JING Xuehui; TANG Quanli; ZHU Jianping; LI Ji; LIU Kunpeng; WANG Jianjiang; WEI Bo

doi:10.19666/j.rlfd.202006096

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Effect of mixing ratio of flue gas in primary air on NO_x generation characteristics in Π-type tangentially fired boiler at low load

Thermal Power Generation Vol. 49, Issue 12, Pages: 84-88(2020)

更新时间：2025-09-28

- Effect of mixing ratio of flue gas in primary air on NO_x generation characteristics in Π-type tangentially fired boiler at low load
- 作者机构：
  
  1. 新疆新能集团有限责任公司
  2. 新疆大学煤炭清洁转化与化工过程自治区重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202006096
  CLC： TK224
- Published Online：01 December 2020，
  
  Published：2020
- 稿件说明：
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JING Xuehui, TANG Quanli, ZHU Jianping, et al. Effect of mixing ratio of flue gas in primary air on NO_x generation characteristics in Π-type tangentially fired boiler at low load[J]. Thermal Power Generation, 2020, 49(12): 84-88.
DOI：

JING Xuehui, TANG Quanli, ZHU Jianping, et al. Effect of mixing ratio of flue gas in primary air on NO_x generation characteristics in Π-type tangentially fired boiler at low load[J]. Thermal Power Generation, 2020, 49(12): 84-88. DOI： 10.19666/j.rlfd.202006096.

摘要

锅炉在低负荷运行时

为了保证携粉能力

一次风量不能随负荷等比例降低

导致燃烧初期氧煤比增大

NO_x生成量增加。采用一次风掺烟方式

将风量与氧量解耦

分别控制一次风量和氧量

保证一次风量的同时降低含氧量

可从源头减少NO_x的生成。以某330 MW机组锅炉结构参数和低负荷运行参数为依据

对该锅炉在低负荷一次风不同掺烟量进行数值模拟研究

分析不同的掺烟量对炉内截面平均温度、氧体积分数、CO体积分数以及NO_x生成质量浓度的影响。结果表明:低负荷一次风掺烟能有效降低锅炉NO_x的生成

随着掺烟量的升高

炉内截面平均温度逐渐降低

CO体积分数逐渐降低

炉膛出口平均温度逐渐升高

NO_x生成质量浓度减少;掺烟量为15%时与未掺烟比较

炉内NO_x生成质量浓度降低79.92 mg/m~3。

Abstract

To ensure the powder carrying capacity of primary air

when the boiler is running at a low load

the primary air volume cannot be reduced in proportion to the load

which leads to an increase in oxygen-to-coal ratio at initial stage of combustion and an increase in NO_x production. By using the method of primary air mixed with flue gas

the air volume and oxygen quantity are decoupled

the primary air volume and oxygen quantity are controlled individually

thus to reduce the oxygen concentration on the premise of ensuring the primary air volume

which can decrease the formation of NO_x from the source. According to the structural parameters and low-load operating parameters of a 330 MW unit boiler

numerical simulation was carried out to study the effects of flue gas mixing ratio on the average temperature in furnace section and the volume fraction of O_2 and CO as well as the mass concentration of NO_x produced. The results show that

blending flue gas in primary air at low load can effectively reduce the NO_x generation in the boiler. With the increase of the mixing ratio of flue gas

the average temperature in the furnace section and the CO volume fraction gradually decreases

the average temperature at the furnace outlet gradually increases

and the NO_x production reduces. Compared with the furnace with no flue gas mixing in primary air

the mass concentration of NO_x production in the furnace with flue gas's mixing ratio of 15% reduces by 79.92 mg/m~3.

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Effect of mixing ratio of flue gas in primary air on NOx generation characteristics in Π-type tangentially fired boiler at low load

DOI：10.19666/j.rlfd.202006096

摘要

Abstract

关键词

Keywords

references

Effect of mixing ratio of flue gas in primary air on NO_x generation characteristics in Π-type tangentially fired boiler at low load