Numerical simulation of combustion process in a tangentially pulverized-coal-fired boiler under variable load operation

WANG Qiuhong; WANG Chao; ZHANG Xiaotao; WANG Aijun; QU Shixi

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Numerical simulation of combustion process in a tangentially pulverized-coal-fired boiler under variable load operation

更新时间：2025-09-28

- Numerical simulation of combustion process in a tangentially pulverized-coal-fired boiler under variable load operation
- Thermal Power Generation Vol. 45, Issue 9, Pages: 61-66(2016)
- 作者机构：
  
  1. 华北水利水电大学电力学院
  2. 新乡航空工业(集团)有限公司
  3. 山东电力工程咨询院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.2
- Published：2016
- 稿件说明：
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WANG Qiuhong, WANG Chao, ZHANG Xiaotao, et al. Numerical simulation of combustion process in a tangentially pulverized-coal-fired boiler under variable load operation[J]. Thermal power generation, 2016, 45(9): 61-66.
DOI：

WANG Qiuhong, WANG Chao, ZHANG Xiaotao, et al. Numerical simulation of combustion process in a tangentially pulverized-coal-fired boiler under variable load operation[J]. Thermal power generation, 2016, 45(9): 61-66. DOI：

摘要

为了研究不同负荷下炉内燃烧及污染物排放情况

基于Fluent软件对某台350MW四角切圆燃烧锅炉进行数值模拟

分析随着锅炉负荷的变化

炉内的流场、温度场、组分分布及污染物NO_x质量浓度分布。结果表明:炉内切圆明显

整个炉膛空间存在螺旋上升的流场;燃烧器区域温度最高

炉内温度随着炉膛高度增加而降低;随着负荷降低

炉内温度水平降低

30%额定负荷工况时炉内温度水平偏低

需要考虑炉内煤粉的引燃和稳燃问题;组分场分布与温度场有很大关系

高温区对应高CO浓度场和低CO_2浓度场;在炉膛高温区大量生成热力型NO_x

随着锅炉负荷降低

炉膛出口NO_x质量浓度逐渐降低。

Abstract

In order to study the combustion process and NO_x emission of supercritical 350 MW unit boilers

the Fluent software was applied to carry out numerical simulation on a 350 MW tangentially coal-fired boiler.The aerodynamic field

temperature field

component field and the NOxdistribution under variable load operation were analyzed.The simulation results indicate that

the tangential circle can be seen obviously and the aerodynamic field is swirling from bottom to top in the furnace.The temperature reaches the highest around the burner areas

it decreases with the increasing furnace height.The temperature difference in the burner zone is 352 Kfrom the BMCR condition to the 30% THA condition.At 30% THA condition

the temperature level in the furnace is low

so the ignition and combustion stabilization need to be considered.The component field is strongly related to the temperature field

the high temperature area corresponds to high CO and low CO_2 concentration.NOxis generated in great quantities in the highest temperature field.The NOxconcentration at the furnace outlet decreases gradually with the unit load.

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