Study on co-combustion process and pollutant emission characteristics of biomass gas and pulverized coal at different temperatures

ZHANG Xiaotao; ZHAO Wei; WEN Meng

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Study on co-combustion process and pollutant emission characteristics of biomass gas and pulverized coal at different temperatures

Thermal Power Generation Vol. 46, Issue 9, Pages: 47-52(2017)

更新时间：2025-09-28

- Study on co-combustion process and pollutant emission characteristics of biomass gas and pulverized coal at different temperatures
- 作者机构：
  
  华北水利水电大学电力学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.2
- Published：2017
- 稿件说明：
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ZHANG Xiaotao, ZHAO Wei, WEN Meng. Study on co-combustion process and pollutant emission characteristics of biomass gas and pulverized coal at different temperatures[J]. Thermal Power Generation, 2017, 46(9): 47-52.
DOI：

ZHANG Xiaotao, ZHAO Wei, WEN Meng. Study on co-combustion process and pollutant emission characteristics of biomass gas and pulverized coal at different temperatures[J]. Thermal Power Generation, 2017, 46(9): 47-52. DOI：

摘要

为了研究不同温度生物质气与煤粉混燃对锅炉燃烧过程的影响

基于Fluent软件

搭建生物质气和煤粉混燃模型

对某电厂亚临界300 MW机组锅炉分别进行了纯煤粉燃烧和掺烧10%的300℃、450℃和600℃生物质气4种工况的炉内燃烧数值模拟

分析不同工况下炉内速度场、温度场、组分场以及污染物NO_x分布特征。结果表明:与纯煤粉燃烧相比

生物质气掺烧后

底层燃烧器生物质气出口烟气速度增加

炉膛中心燃烧温度降低

炉膛出口O_2和CO体积分数升高

而CO_2和NO体积分数降低;随着生物质气温度的升高

相对于纯煤粉工况

其他3种掺烧工况NO_x质量浓度分别降低了15%、24%、32%。

Abstract

In order to investigate the influence of temperature on combustion process of biomass gas mixed with pulverized coal

the co-firing models were built using the Fluent software.By taking a subcritical 300 MW unit boiler as the object

the combustion processes under different conditions were simulated

the velocity field

temperature field

flue gas components and the NO_x distribution features in the furnace were numerically analyzed.The four conditions were pure pulverized coal combustion case and three co-firing cases with 10% biomass gas at 300 ℃

450 ℃ and 600 ℃.The results show that

compared with pure coal combustion condition

during the cocombustion process

the outlet biomass gas velocity at lower burner increases

the temperature at the furnace center decreases

the O_2 and CO volume fraction at furnace outlet increases while the CO_2 and NO decreases.The mass concentration of NO_x decreases by 15%

24% and 32% with the increasing biomass gas temperature.

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