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为了降低LNG船BOG再液化流程的功耗,在ASPEN PLUS中选择合适的热力学方法和设备模块对LNG船BOG再液化装置进行建模。通过对丙烯的预冷换热器出口温度、压缩机出口压力、节流阀出口压力以及BOG压缩机出口压力等工艺设备运行参数的模拟计算,得到各参数对BOG再液化流程功耗的影响规律。以工艺系统最低功耗为优化目标,采用变量轮换法对优化参数进行优化计算,得出在一定海水温度和液货舱BOG压力变化范围内,BOG再液化系统中重要节点的相关参数、压缩机和换热器最优化性能参数和设备设计参数,优化后流程总功耗比优化前降低了8.82%。
In order to reduce the power consumption of the LNG vessel BOG reliquefaction process, the LNG vessel BOG reliquefaction unit was modeled by selecting the appropriate thermodynamic method and equipment module in ASPEN PLUS. The influence of parameters on the power consumption of BOG reliquefaction process was obtained through the simulation calculation of operating parameters of process equipment such as outlet temperature of precooling heat exchanger, compressor outlet pressure, throttle outlet pressure and BOG compressor outlet pressure. . Taking the lowest power consumption of the process system as the optimization objective, the optimization parameters were optimized by the variable rotation method, and the relevant parameters of important nodes in the BOG reliquefaction system were obtained within a certain seawater temperature and within the range of the BOG pressure of the cargo tank. Compressor and Heat exchanger optimization performance parameters and equipment design parameters, the optimized process total power consumption decreased by 8.82% before optimization.