Performance evaluation and comparison of novel combined power cycles consisting of partial pre-heating supercritical carbon dioxide power cycle and different absorption power cycles for waste heat recovery
Performance evaluation and comparison of novel combined power cycles consisting of partial pre-heating supercritical carbon dioxide power cycle and different absorption power cycles for waste heat recovery
Partial heating supercritical carbon dioxide(S-CO2)power cycle system is proven to be one promising option for waste heat recovery.By using LiBr-H2O and NH3-H2O as working fluids,two types of novel combined power systems consisting of a parting pre-heating S-CO2 cycle and different absorption power cycle(APC)systems are proposed.The detailed mathematical models of the proposed parting heating S-CO2/APC systems are built and verified.Based on the results of single-and multi-objective optimization,the performances of the proposed S-CO2/APC system and the standalone S-CO2 system are compared from the perspective of thermodynamics and economics.The single-objective optimization study reveals that the net power output and net efficiency of the S-CO2/LiBr-H2O system and the S-CO2/NH3-H2O system increases by 7.40％and 4.30％,respectively,compared with the standalone S-CO2 system.The multi-objective optimization results show that,the S-CO2/LiBr-H2O system and S-CO2/NH3-H2O system can obtain improvements of 7.94％and 5.13％in net efficiency as well as promotion of 12.35％and 9.02％in the specific investment cost respectively,indicating that the S-CO2/LiBr-H2O system has a greater potential.Exergy loss analysis reveals that the main exergy loss exists in the coolers and the heaters,and the proposed S-CO2/APC systems can significantly reduce the exergy loss in the S-CO2 cooler by about 45％.
关键词
部分预热超临界二氧化碳动力循环/吸收式动力循环/余热回收/经济分析/多目标优化
Key words
partial pre-heating supercritical carbon dioxide power cycle/absorption power cycle/waste heat recovery/economic analysis/multi-objective optimization
维普
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