海上天然气液化流程模拟和优化分析

The Simulation and Optimization Analyses of Process Based on Natural Gas Liquefaction at Sea

本文针对海上伴生气源参数,分别利用双级氮膨胀、氮-甲烷膨胀和单级混合制冷剂液化循环进行模拟,分析和优化了液化流程参数对其功耗的影响.最后选定了利用混合制冷剂循环作为天然气液化的制冷循环。并根据海上天然气装置对混合制冷剂的来源、贮存的要求对混合制冷剂的配比进行了改进。模拟结果表明,通过调整混合制冷剂组成可以方便的在海上平台利用效率更高的混合制冷剂冷却循环对天然气进行液化。

This paper studied three types of cycle,induding two-stage nitrogen expander cycle,nitrogen-methane expansion cycle and single-stage mixed refrigerant cycle（MRC） according to the source parameters of associated gas,analyzed and optimized the influence of process parameters on power consumption.Finally,the MRC is selected to liquefy associated gas.The composition of mixed refrigerant cryogen is improved according to the source and storage restrictions on mixed refrigerant cryogen.The simulation results indicate that mixed refrigerant cycle with high efficiency conveniently is conveniently available in liquefying associated gas at sea by improving composition of mixed refrigerant cryogen.