High exhaust temperature of an HG-1900 / 25.4-HM2boiler : cause analysis and countermeasures

SONG Dayong1; DI Wanfeng2; ZHANG Jiawei 1; WU Ju1; ZOU Tianshu1 1.Electric Power Research Institute of Liaoning Electric Power Co.

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High exhaust temperature of an HG-1900 / 25.4-HM2boiler : cause analysis and countermeasures

更新时间：2025-09-28

- High exhaust temperature of an HG-1900 / 25.4-HM2boiler : cause analysis and countermeasures
- Thermal Power Generation Vol. 42, Issue 7, Pages: 109-114(2013)
- 作者机构：
  
  1. 辽宁省电力有限公司电力科学研究院
  2. 华润电力(贺州)有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK227
- Published：2013
- 稿件说明：
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SONG Dayong1, DI Wanfeng2, ZHANG Jiawei 1, et al. High exhaust temperature of an HG-1900 / 25.4-HM2boiler : cause analysis and countermeasures[J]. Thermal power generation, 2013, 42(7): 109-114.
DOI：

SONG Dayong1, DI Wanfeng2, ZHANG Jiawei 1, et al. High exhaust temperature of an HG-1900 / 25.4-HM2boiler : cause analysis and countermeasures[J]. Thermal power generation, 2013, 42(7): 109-114. DOI：

摘要

从设计和实际运行两方面对HG-1900/25.4-HM2型锅炉排烟温度高的原因进行了分析。结果表明:(1)受烟气流量和烟气比热容增加等因素的影响

褐煤锅炉的排烟温度设计值比一般烟煤锅炉高约20℃;(2)再热器挡板开度过小使尾部受热面整体换热效率下降、尾部受热面积灰严重等造成空气预热器入口烟温高于设计值

空气预热器出口空气流量与理论空气流量之比(β″)下降。空气预热器入口风温高于设计值等是造成排烟温度高于设计值的主要原因。对此

通过采用提高磨煤机出口风温设定值、优化吹灰方式、增加再热器烟气挡板开度等措施

使排烟温度下降15～20℃

排烟温度恢复到设计值范围。

Abstract

The cause of high exhaust gas temperature of an HG-1900/25.4-HM2boiler was analyzed from design and operation aspects.The results showed that:(1)because of the increase of flue gas volume and specific heat capacity and other factors

the design value of exhaust temperature of boilers firing lignite coal was about 20℃higher than that firing bituminous coal;(2)a decrease in total heat transfer efficiency of tail heating surface caused by over small opening degree of the reheater damper

the gas temperature at air preheater inlet was higher than the design value which caused by serious fouling on the tail heating surface

drop of the air volume and theoretical air volume ratio(β″)at the air preheater outlet

and the gas temperature at air preheater inlet was higher than the design value were the main reasons for high exhaust temperature.Thus

measures such as increasing the air temperature set value at coal mill outlet

optimizing the soot blowing and enlarging opening degree of the reheater gas damper were adopted.After the improvement

the exhaust temperature decreased by 15℃to 20℃

returning to normal.

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