Characteristics analysis for centralized heating system using saturated flue gas waste heat in coal-fired power plants

CHEN Ou; TENG Da; LU Guangjie; LIU Xianghui; BI Dongxue; YUN Xiao

doi:10.19666/j.rlfd.202405101

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Characteristics analysis for centralized heating system using saturated flue gas waste heat in coal-fired power plants

更新时间：2025-09-28

- Characteristics analysis for centralized heating system using saturated flue gas waste heat in coal-fired power plants
- Thermal Power Generation Vol. 53, Issue 12, Pages: 102-111(2024)
- 作者机构：
  
  1. 国能龙源环保有限公司
  2. 华北电力大学能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202405101
  CLC： TU832;TM621.2
- Published：2024
- 稿件说明：
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CHEN Ou, TENG Da, LU Guangjie, et al. Characteristics analysis for centralized heating system using saturated flue gas waste heat in coal-fired power plants[J]. Thermal power generation, 2024, 53(12): 102-111.
DOI：

CHEN Ou, TENG Da, LU Guangjie, et al. Characteristics analysis for centralized heating system using saturated flue gas waste heat in coal-fired power plants[J]. Thermal power generation, 2024, 53(12): 102-111. DOI： 10.19666/j.rlfd.202405101.

摘要

燃煤电站锅炉尾部饱和烟气直接排放会导致大量的低品位余热损失。构建了饱和烟气余热回收集中供暖系统，分析了燃煤电站供暖抽汽参数，验证了饱和烟气余热用于加热供热管网回水的可行性，探究了以不同目标运行时集中供暖系统的经济效益，揭示了运行参数对集中供暖系统热力性能的影响特性。结果表明：以饱和烟气余热作为吸收式热泵的低温热源，经吸收式热泵回收的烟气余热温度可提升30～40℃；以350MW供热机组为例，吸收式热泵回收再利用饱和烟气余热为50.23 MW，提升供暖能力带来的经济效益明显优于增加发电量对应的经济效益，机组供热能力可提高13.4%，年度供暖收益新增1 975.20～3 442.32万元。研究结果可为燃煤电站饱和烟气余热回收再利用提供技术参考。

Abstract

Direct discharging of saturated flue gas from coal-fired utility boiler can lead to significant low-grade waste heat loss. The saturated flue gas waste heat recovery and utilization for centralized heating system is constructed

the operating parameters of the heating system in coal-fired power plant are analyzed

and the feasibility that the saturated flue gas waste heat can be used to heat the return water of the heating system is verified. Finally

the economic efficiency of the centralized heating system is investigated for operation with different targets

and the influence characteristics of the operating parameters are revealed for the thermal performance of the centralized heating system. The research results show that

the temperature of flue gas waste heat can be increased by 30～40 ℃ by absorption heat pump. With the 350 MW coal-fired heating unit as an example

the absorption heat pump recovers the saturated flue gas waste heat with 50.23 MW for re-utilization.The economic benefits brought by enhancing the heating capacity are significantly better than those corresponding to the increase in power generation

and the heating capacity of the coal-fired power plant is increased by 13.4%

and the annual heating revenue is increased by 19 752 000～34 423 200 yuan. The research provides technical references for the saturated flue gas waste heat recovery and utilization in coal-fired power plants.

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