Optimization of Stable Combustion at Ultra-Low Load for 350 MW Wall Tangentially Fired Boiler

LIU Tao; XUE Yanfang; WANG Yungang; ZOU Li; ZHANG Yijia; SHEN Tao; ZHAO Qinxin

doi:10.7652/xjtuxb202503010

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Optimization of Stable Combustion at Ultra-Low Load for 350 MW Wall Tangentially Fired Boiler

更新时间：2026-01-06

- Optimization of Stable Combustion at Ultra-Low Load for 350 MW Wall Tangentially Fired Boiler
- Journal of Xi’an Jiaotong University Vol. 59, Issue 3, Pages: 99-109(2025)
- 作者机构：
  
  1.西安交通大学能源与动力工程学院， 710049，西安
  2.中国核电工程有限公司， 100840，北京
  3.哈尔滨锅炉厂有限责任公司， 150046，哈尔滨
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202503010
  CLC： TM621.2
- Received：02 August 2024，
  
  Online First：24 October 2024，
  
  Published：10 March 2025
- 稿件说明：
移动端阅览
LIU Tao, XUE Yanfang, WANG Yungang, et al. Optimization of Stable Combustion at Ultra-Low Load for 350 MW Wall Tangentially Fired Boiler[J]. Journal of Xi’an Jiaotong University, 2025, 59(3): 99-109.
DOI：

LIU Tao, XUE Yanfang, WANG Yungang, et al. Optimization of Stable Combustion at Ultra-Low Load for 350 MW Wall Tangentially Fired Boiler[J]. Journal of Xi’an Jiaotong University, 2025, 59(3): 99-109. DOI： 10.7652/xjtuxb202503010.

摘要

为获得墙式切圆燃煤锅炉在20%额定负荷下燃烧和污染物排放特性，以国内某台350 MW超临界墙式切圆燃煤锅炉为研究对象，研究了其在20%超低负荷下不同燃烧器水平摆角和一次风中掺混不同比例氢气（以热量计算）共燃对烟气温度和烟气主要成分的影响。结果表明：增大燃烧器水平摆角能够缓解20%负荷下锅炉近壁面空气流速较高的问题，但会导致煤粉初期着火延迟，推荐将水平摆角设置为15°；H

共燃比为15%时，主燃区截

面平均烟气温度最高达到1 592 K，比初始工况提高了34 K，共燃比的增加导致炉膛平均温度降低，推荐H

共燃比取15%；NO

排放随着H

共燃比的增加呈现先上升后下降的趋势，共燃比为20%时NO

排放比初始工况下降了21.2%，CO

排放也降低了18.2%，但出口烟气中H

O的摩尔分数增加了20.8%，容易造成低温腐蚀，需要对相关设备进行防腐处理。

Abstract

To investigate the combustion and pollutant emissions characteristics of a wall tangentially fired pulverized-coal boiler operating at 20% of its rated load

this paper focus on a 350 MW supercritical wall tangentially fired pulverized-coal boiler in China. The research explores the impacts of varying burner horizontal swing angles and different proportions of hydrogen (calculated by calorific content) in the primary air on flue gas temperature and the main components of flue gas under a 20% ultra-low load. The findings suggest that increasing the horizontal swing angle of the burners can mitigate the issue of high air velocity near the boiler walls at 20% load. However

this adjustment may result in a delay in the initial ignition of pulverized coal. It is advised to set the horizontal swing angle to 15°. With an H

co-firing ratio of 15%

the average flue gas temperature at the main combustion zone cross-section reaches up to 1 592 K

marking a 34 K increase from the initial conditions. Nevertheless

a rise in the co-firing ratio leads to a decline in the average furnace temperature

with a recommended H

co-firing ratio of 15%. Regarding NO

emissions

they exhibit an initial increase followed by a decrease with the rise in the H

co-firing ratio. At a co-firing ratio of 20%

emissions decrease by 21.2% compared to the initial conditions

and CO

emissions also witness an 18.2% reduction. However

the molar fractions of H

O in the outlet flue gas see a 20.8% increase

posing a risk of low-temperature corrosion. Hence

it is crucial to implement corrosio

n prevention measures for the relevant equipment.

关键词

Keywords

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