Influence of cold flue gas recirculation on depth peak-load regulation capacity of boiler

DONG Xinguang; KONG Qingyu; SUN Jian; ZHANG Limeng; LIU Haojie

doi:10.19666/j.rlfd.201809184

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Influence of cold flue gas recirculation on depth peak-load regulation capacity of boiler

更新时间：2025-09-28

- Influence of cold flue gas recirculation on depth peak-load regulation capacity of boiler
- Thermal Power Generation Vol. 48, Issue 5, Pages: 126-132(2019)
- 作者机构：
  
  1. 国网山东省电力公司电力科学研究院
  2. 华电国际电力股份有限公司邹县发电厂
  3. 山东电力工业锅炉压力容器检验中心有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201809184
  CLC： TK227
- Published Online：29 April 2019，
  
  Published：2019
- 稿件说明：
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DONG Xinguang, KONG Qingyu, SUN Jian, et al. Influence of cold flue gas recirculation on depth peak-load regulation capacity of boiler[J]. Thermal power generation, 2019, 48(5): 126-132.
DOI：

DONG Xinguang, KONG Qingyu, SUN Jian, et al. Influence of cold flue gas recirculation on depth peak-load regulation capacity of boiler[J]. Thermal power generation, 2019, 48(5): 126-132. DOI： 10.19666/j.rlfd.201809184.

摘要

某电厂5号锅炉为670 t/h超高压自然循环锅炉

为提高机组深度调峰能力

安装冷烟气再循环系统

以满足机组深度调峰期间锅炉运行安全经济、环保排放合格。经过对一次冷烟气再循环量、二次冷烟气再循环量的调整优化

机组最低负荷由50%降至34%额定负荷

选择性催化还原(SCR)系统入口烟温达到316℃

再热蒸汽温度为519℃

一次冷烟气再循环量为2.0×10~4 m~3/h

二次冷烟气再循环量为2.5×10~4 m~3/h

机组运行稳定

SCR系统工作正常

深度调峰能力大幅度提高。

Abstract

The No. 5 boiler in a power plant is a 670 t/h ultra high pressure natural circulation boiler. In order to improve the depth peak-load regulation capacity of the unit

cold flue gas recirculation system was installed to meet the environmental protection emission standard and run in safety and economic state. Through adjustment and optimization on flow rate of the primary cold gas recirculation and the secondary cold flue gas

the minimum stable load of the unit was reduced from 50% to 34% of the rated load

the flue gas temperature at the SCR denitration system inlet was 316 ℃

the reheat steam temperature reached 519 ℃

the flow rate of the primary cold gas recirculation was 2.0×10~4 m~3/h

and the flow rate of the secondary cold flue gas was 2.5×10~4 m~3/h.Therefore

the unit ran stably

the SCR denitration system worked normally

and the depth peak-load regulation capacity of the unit was improved dramatically.

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