双混合制冷剂液化工艺应用于海上FLNG的适应性模拟分析

摘要

Dual mixed refrigerant (DMR) liquefaction process would be influenced by the sloshing waves if applied on FLNG on the sea.Mixed refrigerants would not be separated completely with the separator and heat exchange would not be sufficient with the feed gas, which accordingly affects the performance of the liquefaction process.A DMR static simulation model is developed to analyze the sensitivity of the heavy components in the gas-phase outlet of the separator.Simulation results show that the increase in the heavy component content in the gas-phase outlet of the separator would decrease the DMR liquefaction capacity.On the basis of the static model, a DMR liquefaction dynamic simulation model is also developed and used to study the effects of the separator and heat exchanger under sloshing conditions.The results show that the DMR liquefaction capacity decreases slightly (less than 2%) when the separator and/or the heat exchanger are used under sloshing conditions, which indicates the DMR liquefaction process is applicable in offshore FLNG liquefaction plants.This study could provide the theoretical basis for FLNG liquefaction processes, and has significance in both theory and engineering.%双混合制冷剂液化工艺(DMR)在海上FLNG应用时受到波浪晃荡的影响,分离器会出现分离不完全和换热器会存在换热不充分的现象,从而影响液化工艺的性能指标.通过建立DMR静态仿真模型,对分离器气相中重组分含量进行了敏感性分析,结果表明分离器气相中重组分含量的增加会降低DMR液化能力;在静态仿真模型的基础上,建立DMR动态仿真模型,针对我国近海海况进行了晃荡条件下分离器和换热器扰动敏感性分析,结果表明,分离器和换热器在晃荡条件下均会使DMR液化能力有所下降,但下降程度不足2%,说明DMR具有较好的海上适应性.本文研究成果可以为FLNG液化工艺、设备等方面提供理论基础,具有较强的理论和工程意义.