Distribution characteristics of reductive atmosphere close to water wall of an ultra supercritical 1000MW boiler with dual tangential circle

CHEN Xuwei; HE Lijun; CHEN Guoqing; FAN Zhen; CAI Pei

doi:10.19666/j.rlfd.201804075

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Distribution characteristics of reductive atmosphere close to water wall of an ultra supercritical 1000MW boiler with dual tangential circle

更新时间：2025-09-28

- Distribution characteristics of reductive atmosphere close to water wall of an ultra supercritical 1000MW boiler with dual tangential circle
- Thermal Power Generation Vol. 47, Issue 11, Pages: 115-122(2018)
- 作者机构：
  
  1. 国电泰州发电有限公司
  2. 国电科学技术研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201804075
  CLC： TK227.1
- Published Online：24 October 2018，
  
  Published：2018
- 稿件说明：
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CHEN Xuwei, HE Lijun, CHEN Guoqing, et al. Distribution characteristics of reductive atmosphere close to water wall of an ultra supercritical 1000MW boiler with dual tangential circle[J]. Thermal power generation, 2018, 47(11): 115-122.
DOI：

CHEN Xuwei, HE Lijun, CHEN Guoqing, et al. Distribution characteristics of reductive atmosphere close to water wall of an ultra supercritical 1000MW boiler with dual tangential circle[J]. Thermal power generation, 2018, 47(11): 115-122. DOI： 10.19666/j.rlfd.201804075.

摘要

以某电厂超超临界1000 MW机组双切圆锅炉为研究对象

采用现场试验的方法测量了不同运行工况下锅炉水冷壁近壁区烟气成分(O_2、CO和H_2S)

分析了二次风配风方式、分离燃尽风(SOFA)风量、周界风风量、同层燃烧器二次风风量分配方式等因素对水冷壁近壁区O_2、CO和H_2S体积分数的影响。结果表明:受炉内流场影响

主燃区和还原区热角区(2、3、5、8号角)还原性气氛比较强;通过调整二次风配风方式和SOFA风量

适当提高主燃区和还原区的风量

可以减弱炉膛四周水冷壁近壁区还原性气氛

缓解水冷壁高温腐蚀;通过调整同层燃烧器各角二次风风量和周界风风量

适当提高1、4、6、7号冷角燃烧器射流刚性

可减弱热角水冷壁近壁区还原性气氛。

Abstract

Taking an ultra supercritical 1 000 MW boiler with dual tangential circle as the research object

the flue gas components(O_2

CO and H_2S) near the water wall were detected under different operational conditions. Moreover

the influences of several factors

such as the second-air distribution mode

the separated over-fired air(SOFA) flow rate

the circumferential air flow rate and the second-air flow rate distribution at the same layer burners

on the volume fraction of O_2

CO and H_2S close to the water wall were analyzed. The results show that

affected by the special aerodynamic field inside the furnace

the areas close to burners 2

5 and 8 have the relative stronger reductive atmosphere and higher temperature. Regulating the secondary air distribution and SOFA flow rate

as well as increasing air flow rate of the primary combustion zone and reducing zone

could weaken the reductive atmosphere near the water wall. The reductive atmosphere near the hot corner water wall could be decreased by adjusting the circumferential air flow rate and second-air flow rate distribution at the same layer burner

and increasing the second air jet momentum of burners 1

6 and 7.

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