Experimental Research on the Recovery of Waste Heat from Gas-fired Boiler Flue Gas Using a Compression Heat Pump

DENG Shifeng; ZHANG Haoyuan; GUO Hui; LI Guangying; DONG Kai; QU Teng; GAO Yunlong; ZHAO Qinxin

doi:10.19805/j.cnki.jcspe.2025.240283

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Experimental Research on the Recovery of Waste Heat from Gas-fired Boiler Flue Gas Using a Compression Heat Pump

更新时间：2026-10-10

- Experimental Research on the Recovery of Waste Heat from Gas-fired Boiler Flue Gas Using a Compression Heat Pump
- Chinese Journal of Power Engineering Vol. 45, Issue 7, Pages: 1144-1152(2025)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,陕西,西安,710049
  2. 博瑞特热能设备股份有限公司,安徽,宣城,242000
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240283
  CLC：
- Online First：14 July 2025，
  
  Published：2025
- 稿件说明：
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邓世丰,张浩远,郭辉,李光英,董凯,曲腾,高云龙,赵钦新. 压缩式热泵回收燃气锅炉烟气余热的实验研究动力工程学报, 2025, 45(7): 1144-1152 https://doi.

org/10.19805/j.cnki.jcspe.2025.240283
邓世丰,张浩远,郭辉,李光英,董凯,曲腾,高云龙,赵钦新. 压缩式热泵回收燃气锅炉烟气余热的实验研究动力工程学报, 2025, 45(7): 1144-1152 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240283.

org/10.19805/j.cnki.jcspe.2025.240283 DOI：

摘要

基于现有燃气热水锅炉排烟中占燃料输入低位热值约10%的潜热和显热并未被有效利用

搭建了燃气锅炉烟气余热回收实验平台

分析了电压缩式热泵回收烟气冷凝热对锅炉系统效率以及经济性的影响

并提出了气电耦合系统运行优化策略。结果表明:锅炉回水温度和热负荷越高

锅炉本体的排烟温度越高

热效率越低;随着锅炉本体热负荷和回水温度的升高

耦合热泵后的锅炉系统热效率提升幅度越大

提升幅度为4.4百分点~10.4百分点;增加锅炉负荷、降低回水温度有利于提高热泵性能系数(coefficient of performance

COP)

热泵系统的投资回收期可缩短至3 a以内;由于热泵的最优实时功率随着电价的增加不断向低功耗高效率的方向移动

应根据锅炉负荷和气电价比实时调整热泵出力。

Abstract

The latent and sensible heat in the exhaust of the existing gas-fired hot water boiler

which accounts for about 10% of the lower heating value of the fuel input

remains underutilized. In response to this

an experimental platform to recover waste heat from gas-fired boiler flue gas was built and the impact of electro-compression heat pumps recovering flue gas condensation heat on boiler system efficiency and economy was analyzed. Additionally

an operation optimization strategy for the coupled gas-electricity system was proposed. Results show that the higher the return water temperature and heat load of the boiler

the higher the exhaust gas temperature of the boiler body

and the lower the thermal efficiency. As the boiler proper's thermal load and return water temperature increase

the heat pump integration improves more significantly the coupled system's thermal efficiency

with an increase of 4.4-10.4 percentage points. Raising the boiler load and lowering the return water temperature can enhance the heat pump's coefficient of performance (COP)

shortening the payback period of the heat pump system to within three years. Since the heat pump's optimal real-time power shifts toward lower power consumption and higher efficiency with increasing electricity prices

the heat pump output should be adjusted in real-time based on boiler load and gas-to-electricity price ratio.

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references

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