Abstract Part of the process gas cooling in a sample gas refinery is provided by a two-stage vapor compression refrigeration cycle. This cycle has been designed only based on thermodynamics’ objective function with propane refrigerant. A gas-turbine is used as the compressors’ driver in this sample plant. In the present study, the complete investigation of this compression refrigeration cycle with its gas turbine, as a prime mover, has been redesigned by using the genetic algorithm, and refrigerant analyses. The cycle has been modeled in MATLAB software by considering the economic, thermodynamic, and environmental objective functions. The results show that the basic redesign of the cycle, with propylene as the best refrigerant, can improve the coefficient of performance from 1.42 to 2.01 in comparison to the available cycle. It also can reduce the nitrogen oxide and carbon monoxide emission from 30.74 to 29.7 ppm and 81.0 to 71.6 ppm, respectively, and it can reduce the cost of the product from 1091.5 $ to 781.5 $ per hour. In fact, by replacing propylene refrigerant with propane and multi-objective basic redesign, all three economic, thermodynamic, and environmental functions can be improved in comparison to the available cycle.

中文翻译：

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考虑制冷剂最佳分配的炼气厂天然气预冷两级制冷循环优化设计

摘要 样气精炼厂的部分工艺气体冷却由两级蒸汽压缩制冷循环提供。该循环仅根据丙烷制冷剂的热力学目标函数设计。在这个样本工厂中，一台燃气轮机用作压缩机的驱动器。在本研究中，通过使用遗传算法和制冷剂分析重新设计了以燃气轮机作为原动机的压缩制冷循环的完整研究。通过考虑经济、热力学和环境目标函数，在 MATLAB 软件中对循环进行了建模。结果表明，与可用循环相比，以丙烯为最佳制冷剂的循环的基本重新设计可以将性能系数从 1.42 提高到 2.01。它还可以将氮氧化物和一氧化碳的排放量分别从30.74 ppm 降低到29.7 ppm 和81.0 ppm 到71.6 ppm，并且可以将产品成本从每小时1091.5 美元降低到781.5 美元。事实上，通过用丙烷替代丙烯制冷剂和多目标基本重新设计，与可用循环相比，所有三个经济、热力学和环境功能都可以得到改善。