Reason analysis and countermeasures for low reheat steam temperature of a 2030 t/h W-flame boiler at low load

YANG Hui; LIANG Shimang; YANG Yu; SU Lin; ZHANG Hailong; NIE Jianping

doi:10.19666/j.rlfd.201912269

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Reason analysis and countermeasures for low reheat steam temperature of a 2030 t/h W-flame boiler at low load

更新时间：2025-09-28

- Reason analysis and countermeasures for low reheat steam temperature of a 2030 t/h W-flame boiler at low load
- Thermal Power Generation Vol. 49, Issue 9, Pages: 114-120(2020)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能重庆珞璜发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201912269
  CLC： TK227.1
- Published Online：15 August 2020，
  
  Published：2020
- 稿件说明：
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YANG Hui, LIANG Shimang, YANG Yu, et al. Reason analysis and countermeasures for low reheat steam temperature of a 2030 t/h W-flame boiler at low load[J]. Thermal power generation, 2020, 49(9): 114-120.
DOI：

YANG Hui, LIANG Shimang, YANG Yu, et al. Reason analysis and countermeasures for low reheat steam temperature of a 2030 t/h W-flame boiler at low load[J]. Thermal power generation, 2020, 49(9): 114-120. DOI： 10.19666/j.rlfd.201912269.

摘要

某600 MW机组W火焰锅炉75%以下负荷时存在再热汽温较设计值(541℃)偏低问题

严重影响机组运行经济性。本文通过锅炉热力计算并结合炉内温度CFD分析

对再热汽温偏低原因进行了研究。结果表明:300 MW负荷下通过常规的运行调整方式无法提升再热汽温;锅炉低负荷下再热汽温偏低是高温对流受热面积分配相对不合理所致。对此

提出了增加低温再热器和高温再热器面积

减少高温过热器面积等方案

其中增加低温再热器和高温再热器受热面虽能够提高再热汽温达到设计值

但烟道布置空间受限

工程上无法实施

而减少高温过热器受热面积2 792 m2

能够在50%负荷下提升再热汽温到设计值

且可以控制再热器减温水量在0 t/h。虽然锅炉效率下降影响发电煤耗升高

但整体对煤耗的改善明显。

Abstract

The reheat steam temperature of a 600 MW unit W-flame boiler at 75% load and below is lower than the design value(541 ℃)

which seriously affects the economic efficiency of the unit operation. Through the boiler thermodynamic calculation and the CFD analysis on temperature in the furnace

the reason for low reheat steam temperature is studied. The results show that

at 300 MW

general operation adjustments cannot improve the reheat steam temperature further. The low reheat stem temperature at low load is caused by the relatively unreasonable distribution of high temperature convective heating area. Thus

it proposed to increase the heating area of low temperature heater and high temperature reheater

and reduce the heating area of high temperature superheater. Increasing the heating area of low temperature heater and high temperature reheater can increase the reheat steam temperature and make it reach the design value

but limited by the flue duct arrangement

this method can not be implemented in engineering. While reducing the heating area of the superheater by 2 792 m2 can increase the reheat steam temperature to the design value at 300 MW load

and control the desuperheaing water flow at 0 t/h. In this method

although the reduction of boiler efficiency increases the coal consumption for power generation

the overall reduction of coal consumption is obvious.

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