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首页> 外文期刊>Energy Conversion & Management >Exergoeconomic analysis and optimization of a combined cooling, heating and power system based on organic Rankine and Kalina cycles using liquified natural gas cold energy
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Exergoeconomic analysis and optimization of a combined cooling, heating and power system based on organic Rankine and Kalina cycles using liquified natural gas cold energy

机译：基于有机朗朗和Kalina循环的基于有机朗朗的冷却，加热和电力系统的Exergo经济分析与优化使用液化天然气冷能

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摘要

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 multiobjective 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.
机译：随着液化天然气贸易的增加，越来越多地关注液化天然气冷能量利用。为了更好地恢复和利用液化天然气冷能，本文提出了一种新的基于液化天然气冷能量利用和废气废热回收的组合冷却，加热和动力系统。该系统由三级有机朗肯循环，Kalina循环和液化天然气直接扩张组成。为了评估组合冷却，加热和电力系统的性能，建立了一种数学模型，通过热力学分析，系统的净输出功率，热效率和高效效率为1257.708千瓦，43.43％和70.4％，分别。分析了泵和压缩机出口压力，第一朗肯循环中的N-己烷质量流速，涡轮机入口温度和涡轮机的型涡轮机上的型涡轮机上的效果。此外，Exergo经济分析用于计算组合冷却，加热和电力系统的总产品单位成本，该产品被发现为51.1 $ / gj。此外，还进行了系统的单一和多目标优化。多目标优化结果表明，这种新型冷却，加热电量和电力系统的最大效率和最低总产品单位成本分别为80.49％和48.04美元/ GJ。通过组合的冷却，加热和动力系统，该工作表明了利用液化天然气冷能和废气的废热。

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