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Home / Journals / ENERGY / Online First / doi:10.32604/ee.2026.085760
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Thermal-Fluid System Integration of a Lithium Bromide Absorption Heat Pump for Advanced Waste Heat Recovery in Coal-Fired Power Plants

Yingchao Wang1,2,*, Jie Wang1, Xin Li1, Changxin Qi1, Jia Gao1, Jiading Jiang1, Shaowu Yin1,3, Xiaochao Fan1
1 School of Energy Engineering, Xinjiang Institute of Engineering, Urumqi 830023, China
2 School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
3 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
* Corresponding Author: Yingchao Wang. Email: email
(This article belongs to the Special Issue: Innovative Energy Engineering for Resilient and Green Systems)

Energy Engineering https://doi.org/10.32604/ee.2026.085760

Received 18 May 2026; Accepted 29 June 2026; Published online 07 September 2026

Abstract

Coal-fired power plants often face high thermal energy consumption for district heating and inadequate cascade utilization of waste heat. To address these challenges, this study proposes an integrated heat recovery system that couples a low-temperature economizer with a lithium bromide (LiBr) absorption heat pump. A 350 MW supercritical unit serves as the case study, where a cascaded heating system is configured, using turbine extraction steam as the driving heat source to recover waste heat from both pre-desulfurization flue gas and condenser circulating water. A steady-state simulation model is developed to evaluate the system performance. The results show that the system recovers 8.026 MW of waste heat from the flue gas, achieves a heat pump coefficient of performance (COP) of 1.718, and reduces the heating extraction steam consumption by 32.5% compared with conventional approaches. These findings demonstrate a viable strategy for energy-saving retrofits and enhanced operational flexibility of existing coal-fired units, particularly in regions with substantial heating demands.

Keywords

Absorption heat pump; coal-fired unit; waste heat recovery; performance analysis; simulation

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