School of Energy and Environmental Engineering, Hebei University of Engineering, Handan, People's Republic of China.
China Coal Energy Research Institute Co., Ltd., Xi, an, People's Republic of China.
Environ Technol. 2024 Nov;45(25):5318-5331. doi: 10.1080/09593330.2023.2290600. Epub 2023 Dec 12.
Combining mine exhaust waste heat with existing heat pump technology is a promising technical route to realise the efficient extraction and scientific use of low-grade waste heat resources in mines and to solve the problem of insufficient heat supply in remote mining areas. This study proposes a new type of mine-exhaust-air heat exchange coupled with heat-pump waste-heat-utilisation system based on deep enthalpy heat extraction. Using a mining area in Northwest China as a representative case, this study establishes a systematic exergy analytical model and a thermo-economic model. Through an in-depth analysis of the different evaporation temperatures and condensing temperatures, the system's energy efficiency ratio (COP) reaches its optimal performance, with the total exergy efficiency surpassing 90%. The minimum efficiency of the subsystem return air heat exchanger is 35%. The unit thermal costs of the mine exhaust air waste heat utilisation system and a conventional coal-fired boiler system are 0.1291 and 0.1573 million RMB/kW·h, respectively. This is a thermal economics cost saving of 21%. The studied system demonstrates great economic viability and the potential for energy saving throughout its life cycle.
将矿井乏风余热与现有的热泵技术相结合，是实现矿山低品位余热资源高效提取和科学利用、解决偏远矿区供热不足问题的一种有前途的技术路线。本研究提出了一种基于深层焓提取的新型矿井乏风热交换与热泵余热利用系统。以中国西北地区的一个矿区为例，建立了系统的火用分析模型和热经济模型。通过对不同蒸发温度和冷凝温度的深入分析，该系统的能源效率比（COP）达到最佳性能，总火用效率超过 90%。回风换热器子系统的最小效率为 35%。矿井乏风余热利用系统和常规燃煤锅炉系统的单位热成本分别为 0.1291 和 0.1573 万元/kW·h，节约了 21%的热力成本。研究系统在整个生命周期内具有巨大的经济可行性和节能潜力。
