Classification of heat exchanger and optimization of flue gas flow field in a 600 MW coal-fired boiler

LU Fen; WEN Shurong; FENG Runfu; ZHOU Yan; YUAN Yang; YANG Jianhua; ZHOU Fei; ZHANG Guangcai

doi:10.19666/j.rlfd.201802035

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Classification of heat exchanger and optimization of flue gas flow field in a 600 MW coal-fired boiler

更新时间：2025-09-28

- Classification of heat exchanger and optimization of flue gas flow field in a 600 MW coal-fired boiler
- Thermal Power Generation Vol. 47, Issue 5, Pages: 124-130(2018)
- 作者机构：
  
  1. 西安西热锅炉环保工程有限公司
  2. 内蒙古上都发电有限责任公司
  3. 北方联合电力有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201802035
  CLC： TK229
- Published Online：03 May 2018，
  
  Published：2018
- 稿件说明：
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LU Fen, WEN Shurong, FENG Runfu, et al. Classification of heat exchanger and optimization of flue gas flow field in a 600 MW coal-fired boiler[J]. Thermal power generation, 2018, 47(5): 124-130.
DOI：

LU Fen, WEN Shurong, FENG Runfu, et al. Classification of heat exchanger and optimization of flue gas flow field in a 600 MW coal-fired boiler[J]. Thermal power generation, 2018, 47(5): 124-130. DOI： 10.19666/j.rlfd.201802035.

摘要

燃煤机组锅炉低负荷运行时

易出现脱硝系统入口烟温偏低导致选择性催化还原反应(SCR)烟气脱硝系统无法正常投运

以及一次风温低、制粉系统干燥出力不足等问题。本文以某600 MW燃煤机组为例

提出了综合改造方案即割除部分水平低温过热器及高温省煤器换热面积

增加SCR脱硝系统后换热面

优化管式空气预热器(空预器)入口烟气流场。实施改造后

300 MW负荷下

管式空预器中出口一次风温提高26℃

SCR脱硝系统入口烟温提高28℃

制粉系统干燥出力提高

脱硝装置适应低负荷调峰能力增强。该技术的成功应用为同类型机组实施技术改造提供了思路。

Abstract

When coal-fired boiler is running at low load

there are some problems

such as the low inlet gas temperature causing SCR denitration system to be unable to operate normally

the low primary air temperature

and the insufficient drying capacity of the pulverizing system. In this study

taking a 600 MW coal-fired unit as an example

a comprehensive transformation scheme is proposed for cutting off part of the heat exchange surface of the horizontal low-temperature superheater and high-temperature economizer

increasing the heat exchange surface at the outlet of the SCR denitration system

and optimizing the flue gas flow field at the inlet of tubular pipe air preheater. After the transformation

under the load of 300 MW

the primary air temperature at the outlet of tubular pipe air preheater is increased by 26 ℃

the gas temperature at the inlet of the SCR denitration system increases by 28 ℃

the drying capacity of the pulverizing system is enhanced

and the adaptive ability of the SCR denitration system to depth peak regulation is greatly improved. The successful application of this technology provides ideas for the technical transformation of the same type of units.

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