Influence of boiler bottom air leakage on performance of a 600 MW unit boiler

TONG Jialin; QI Xiaojuan; HAN Ping; GUAN Jian; LYU Hongkun

doi:10.19666/j.rlfd.202006024

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Influence of boiler bottom air leakage on performance of a 600 MW unit boiler

更新时间：2025-09-28

- Influence of boiler bottom air leakage on performance of a 600 MW unit boiler
- Thermal Power Generation Vol. 50, Issue 4, Pages: 126-131(2021)
- 作者机构：
  
  1. 国网浙江省电力有限公司电力科学研究院
  2. 杭州意能电力技术有限公司
  3. 浙江省能源集团有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202006024
  CLC： TM621.2
- Published：2021
- 稿件说明：
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TONG Jialin, QI Xiaojuan, HAN Ping, et al. Influence of boiler bottom air leakage on performance of a 600 MW unit boiler[J]. Thermal power generation, 2021, 50(4): 126-131.
DOI：

TONG Jialin, QI Xiaojuan, HAN Ping, et al. Influence of boiler bottom air leakage on performance of a 600 MW unit boiler[J]. Thermal power generation, 2021, 50(4): 126-131. DOI： 10.19666/j.rlfd.202006024.

摘要

针对风冷式干排渣系统

采用数值模拟方法研究了各典型负荷下该系统炉底漏风对锅炉温度场、燃尽率、NO_x生成量等的影响。结果表明:干渣机冷空气漏入后

炉内整体温度水平降低

对中下层燃烧器层的稳燃能力影响较大

低负荷下底层燃烧器中心截面烟气温度可下降100K;煤粉不完全燃烧损失增大

NO_x生成量亦有所增加

特别是当系统密封不严时

其影响不容忽视;炉底漏风产生后

空气预热器X比减小

可使锅炉排烟温度大幅提高。

Abstract

Against air-cooled dry-type slag extractor system

numerical simulation is carried out to study the influence of boiler bottom air leakage on temperature field

burn-out rate

NOx production at typical loads. The results indicate that

after the cold air leaks from dry-type slag extractorthe overall temperature level in the furnace decreases

which has a great effect on combustion stability of the middle and lower burner layers

and the flue gas temperature at the center section of the bottom burner can be reduced by 100 K at low load. Meanwhile

the coal incomplete combustion loss and NO_x production also rises. The influence of air leakage can not be ignored especially when the system is poorly sealed. The exhaust gas temperature rises markedly because X ratio of the air preheater decreases after the boiler bottom air leakage happens.

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