Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units

SONG Jinghui; LIU Guicai; LIAO Yanfen; MA Xiaoqian

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Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units

更新时间：2025-09-28

- Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units
- Thermal Power Generation Vol. 44, Issue 9, Pages: 57-60(2015)
- 作者机构：
  
  1. 广东电网有限责任公司电力科学研究院
  2. 华南理工大学电力学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK115;TM621
- Published：2015
- 稿件说明：
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SONG Jinghui, LIU Guicai, LIAO Yanfen, et al. Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units[J]. Thermal power generation, 2015, 44(9): 57-60.
DOI：

SONG Jinghui, LIU Guicai, LIAO Yanfen, et al. Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units[J]. Thermal power generation, 2015, 44(9): 57-60. DOI：

摘要

在锅炉烟道尾部安装低压省煤器

可降低排烟温度

提高锅炉效率;将烟气余热用于汽轮机抽汽回热系统

可使部分回热器抽汽返回汽轮机做功

提高机组的能源利用率。为此

以某100 MW燃煤机组为例

通过迭代-校核法和等效焓降法

验证了采用低压省煤器进行余热利用的节能效果。结果表明

余热利用改造方案可使该机组锅炉排烟温度降低23.7℃

锅炉效率提高1.214%

热耗率降低60kJ/(kW·h)

发电标煤耗量减少2.313g/(kW·h)。

Abstract

Installing low pressure economizer in tail flue duct of boilers can reduce exhaust temperature and enhance the boiler efficiency.The waste heat of flue gas is introduced into regenerative system of the steam turbine

so part of the exaction steam will return into the turbine to do work

thus to improve energy utilization efficiency of the unit.Taking a 100 MW unit coal-fire power unit as the example

the energy-saving effect of the above waste heat utilization technology was verified by applying the iteration-check method and the equivalent enthalpy drop method.The results show that

this waste heat recovery transformation scheme can reduce the exhaust temperature by 23.7 ℃

increase the boiler efficiency by 1.214%

decrease the heat rate by 60kJ/(kW·h)and save the coal consumption by 2.313g/(kW·h).

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