超临界CO_(2)-有机朗肯联合循环的多目标优化

Multi-objective Optimization of Supercritical CO_(2)-Organic Rankine Combined Cycle

采用复合型超临界二氧化碳-有机朗肯联合循环来回收燃气轮机的余热,建立了热力学以及[火用]经济性模型,探究了关键参数对联合循环系统性能的影响规律,从热力学性能、空间紧凑性、[火用]经济性能等方面对联合循环系统进行了研究,并对联合循环进行了多目标优化。结果表明:在最优状态下复合型超临界二氧化碳再压缩-有机朗肯联合循环的效率为54.56%,比燃-蒸联合循环提高了4.2%,其单位输出功率所需换热面积为0.1178m^(2)/kW,比燃-蒸联合循环降低了21.41%。

A composite supercritical carbon dioxide-organic Rankine combined cycle was used for waste heat recovery from the gas turbine,comprehensive thermodynamic and exergy economic model was established,and the impact of key parameters on the performance of the combined cycle system was explored.A study has been carried out on the combined cycle system from multiple purposes such as thermodynamic performance,space compactness and exergy economic performance,so as to conduct the multi-objective optimization on the combined cycle.Results show that the combined cycle efficiency in the optimal state can reach 54.56%,which is 4.2%higher than that of the conventional gas turbine-steam combined cycle.The required heat exchange area per unit power output is 0.1178 m^(2)/kW,which is 21.41%lower than that of the conventional gas turbine-steam combined cycle.