With the increase of liquified natural gas trade, more and more attention has been paid to the liquified natural gas cold energy utilization. In order to better recover and utilize liquified natural gas cold energy, a novel combined cooling, heating and power system based on liquified natural gas cold energy utilization and exhaust gas waste heat recovery is proposed in this paper. The system consists of a three-stage organic Rankine cycle, a Kalina cycle and liquified natural gas direct expansion. To evaluate the performance of the combined cooling, heating and power system, a mathematical model was established, and through the thermodynamic analysis the net output power, thermal efficiency, and exergy efficiency of the system were 1257.708 kW, 43.43%, and 70.4%, respectively. The effects of the pump and compressor outlet pressure, n-hexane mass flow rate in the first Rankine cycle, turbine inlet temperature, and isentropic efficiency of the turbines on the system performance were analyzed. Moreover, exergoeconomic analysis is used to calculate the total product unit cost of the combined cooling, heating and power system, which was found to be 51.1 $/GJ. In addition, single- and multi-objective optimizations of the system were performed. The multi-objective optimization results show that the maximum exergy efficiency and minimum total product unit cost of this novel combined cooling, heating and power system were 80.49% and 48.04 $/GJ, respectively. This work shows a great potential in utilizing the liquified natural gas cold energy and waste heat of exhaust gas by a combined cooling, heating and power system.

随着液化天然气贸易的增加，液化天然气冷能的利用越来越受到重视。为了更好地回收利用液化天然气冷能，提出了一种基于液化天然气冷能利用和废气余热回收的新型冷热电联产系统。该系统由三阶段有机朗肯循环，卡利纳循环和液化天然气直接膨胀组成。为了评估冷却，加热和电力组合系统的性能，建立了数学模型，通过热力学分析，系统的净输出功率，热效率和火用效率分别为1257.708 kW，43.43％和70.4％，分别。泵和压缩机出口压力的影响，n分析了第一个兰金循环中的正己烷质量流量，涡轮机入口温度以及涡轮机的等熵效率对系统性能的影响。此外，使用能效经济分析来计算冷却，加热和动力系统组合的总产品单位成本，发现为51.1 $ / GJ。此外，还对系统进行了单目标和多目标优化。多目标优化结果表明，这种新颖的冷却，加热和动力系统组合的最大火用效率和最小总产品单位成本分别为80.49％和48.04 $ / GJ。这项工作显示出通过组合的冷却，加热和动力系统利用液化天然气冷能和废气余热的巨大潜力。