TY  - EJOU
AU  - Wang, Yingchao 
AU  - Wang, Jie 
AU  - Li, Xin 
AU  - Qi, Changxin 
AU  - Gao, Jia 
AU  - Jiang, Jiading 
AU  - Yin, Shaowu 
AU  - Fan, Xiaochao 

TI  - Thermal-Fluid System Integration of a Lithium Bromide Absorption Heat Pump for Advanced Waste Heat Recovery in Coal-Fired Power Plants
T2  - Energy Engineering

PY  - 
VL  - 
IS  - 
SN  - 1546-0118

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

DO  - 10.32604/ee.2026.085760