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Performance Analysis and Evaluation of a Supercritical CO2 Rankine cycle Coupled with an absorption refrigeration cycle

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Journal of Thermal Science 2020年第4期29卷 1036-1052页

作者： CHEN Yi XU Dongjie CHEN Zheng GAO Xiang REN Fukang HAN Wei China Electric Power Planning&Engineering Institute Beijing 100120China College of Energy Engineering Zhejiang UniversityHangzhou 310058China Power and Mechanical Engineering North China Electric Power UniversityBaoding 071003China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China

The utilization of sensible waste heat such as flue gas and industrial surplus heat is essential for energy saving. Supercritical CO2 power generation cycle is a promising way to be used in this field. In this paper, a new supercritical CO2 Rankine cycle coupled with an absorption refrigeration cycle is proposed, which consists of a reheating supercritical CO2 cycle, a mixed-effect Li Br-H2O absorption refrigeration cycle and solar subsystem including evacuated-tube collector and a hot water storage tank. The system has four variants according to the presence or absence of solar subsystem and net cooling energy output. The thermodynamic model of the proposed system was established and its performance was evaluated. The proposed system is able to realize cascade utilization of flue gas waste heat and efficient conversion of solar energy. It has much higher thermodynamic efficiency than the reference system(i.e., the conventional supercritical CO2 Brayton cycle). Taking combined power and cooling system driven by flue gas waste heat and solar energy as an example, its thermal efficiency and exergy efficiency are 20.37% and 54.18% respectively, compared with the 14.74% and 35.96% of the reference system. Energy Utilization Diagrams(EUD) are implemented to investigate the irreversible losses and variation of the exergy destruction in the energy conversion process. Parametric analysis in two key parameters is conducted to provide guidance for the system optimal design.

关键词： supercritical CO2 cycle absorption refrigeration cycle sensible heat source solar energy thermodynamic analysis

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Performance Analysis of an Integrated Supercritical CO_(2) Recompression/absorption refrigeration/Kalina cycle Driven by Medium-Temperature Waste Heat

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Journal of Thermal Science 2022年第6期31卷 2051-2067页

作者： SU Ruizhi YU Zeting WANG Daohan SUN Bo SUN Jia’nan School of Energy and Power Engineering Shandong UniversityJi'nan 250061China Shandong Engineering Laboratory for High-Efficiency Energy Conservation and Energy Storage Technology&Equipment Shandong UniversityJi'nan 250061China School of Electrical Engineering Shandong UniversityJi'nan 250061China School of Control Science and Engineering Shandong UniversityJi'nan 250061China

A novel power and cooling cogeneration system which combines a supercritical CO_(2) recompression cycle(SCRC), an ammonia-water absorption refrigeration cycle(AARC) and a Kalina cycle(KC) is proposed and investigated for the recovery of medium-temperature waste heat. The system is based on energy cascade utilization, and the waste heat can be fully converted through the simultaneous operation of the three sub-cycles. A steady-state mathematical model is built for further performance study of the proposed system. When the exhaust temperature is 505℃, it is shown that under designed conditions the thermal efficiency and exergy efficiency reach 30.74% and 61.55%, respectively. The exergy analysis results show that the main exergy destruction is concentrated in the heat recovery vapor generator(HRVG). Parametric study shows that the compressor inlet pressure, the SCRC pressure ratio, the main compressor and the turbine I inlet temperature, and the AARC generator pressure have significant effects on thermodynamic and economic performance of the combined system. The findings in this study could provide guidance for system design to achieve an efficient utilization of medium-temperature waste heat(e.g., exhaust heat from gas turbine, high-temperature fuel cells and internal combustion engine).

关键词： waste heat utilization cogeneration system supercritical CO_(2)recompression cycle absorption refrigeration cycle Kalina cycle

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