Effect of biomass co-firing and air staging on NO<sub>x</sub> emissions

WEI Gang; FAN Xiaohua; WANG Yibin; WANG Xuebin; LI Yan; TAN Houzhang

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Effect of biomass co-firing and air staging on NO_x emissions

更新时间：2025-09-28

- Effect of biomass co-firing and air staging on NO_x emissions
- Thermal Power Generation Vol. 44, Issue 5, Pages: 7-11(2015)
- 作者机构：
  
  1. 国网河北省电力公司电力科学研究院
  2. 西安交通大学热流科学与工程教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK6
- Published：2015
- 稿件说明：
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WEI Gang, FAN Xiaohua, WANG Yibin, et al. Effect of biomass co-firing and air staging on NO_x emissions[J]. Thermal power generation, 2015, 44(5): 7-11.
DOI：

WEI Gang, FAN Xiaohua, WANG Yibin, et al. Effect of biomass co-firing and air staging on NO_x emissions[J]. Thermal power generation, 2015, 44(5): 7-11. DOI：

摘要

在一维沉降炉中进行了生物质(麦秆、木屑)与煤粉的纯烧、混烧实验

并研究了燃料种类、混燃比例、空气分级等不同因素对燃烧产生的NO和CO含量沿烟气流动方向的分布规律以及飞灰含碳量的影响。结果表明:纯烧生物质和煤粉时

NO含量沿烟气流动方向先增大后减小

煤粉燃烧产生的NO含量大约是麦秆和木屑燃烧产生的2~3倍;煤粉燃烧产生的CO含量随烟气流动先增加后减少

而生物质燃烧产生的CO含量则逐渐减小;分级风量的增加并不能改变沿烟气流动方向上NO和CO含量的变化趋势

但能对燃煤产生的NO具有较强的减排能力。当生物质与煤粉混燃时

NO排放量随麦秆混合比例的增加而逐渐减小

但当混合比例增至40%以后

继续增大生物质比例对NO减排作用影响很小;当麦秆比例达到40%以上、分级风量达到20%时

空气分级对NO减排的影响较小。

Abstract

Combustion of biomass(straw and wood)and coal was investigated in a drop tube furnace.Moreover

factors like mixing ratio and air staging on emissions of NO and CO along the flue gas flow direction was analyzed.Also

the unburned carbon content in fly ash was investigated.The results show that

along the flue gas flow direction

the NO concentration increased first and then decreased slowly for pure combustion of both biomass and coal

and the NO emission from straw or wood combustion only accounted for about 1/3or 1/2of that from coal combustion.The CO content during coal combustion increased first and then decreased

while that during the biomass combustion reduced gradually.Increasing the staging air quantity had little influence on variations of the NO and CO concentration but can reduce the NO emission dramatically for coal combustion.For co-combustion of the biomass and coal

the NO emission reduced gradually with the increasing mixing ratio

but when the mixing ratio increased to over 40%

increasing the biomass proportion had little effect on NO reduction.When the straw's proportion and the staging air volume reached over 40% and 20%respectively

staging air had little influence on NO emission.

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Effect of biomass co-firing and air staging on NOx emissions

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Effect of biomass co-firing and air staging on NO_x emissions