合成天然气液化精馏脱氢流程及其性能优化

Optimization on the Synthetic Natural Gas Liquefaction and Distillation Dehydrogenization Process

合成天然气(Synthetic Natural Gas,SNG)中含有的少量氢组分会对SNG的热物性造成显著影响,进而对SNG的液化流程及储运设备等提出了较高的要求。因此,本文针对低含氢量(摩尔组分小于5%)的含氢合成气提出了液化精馏脱氢联合流程,并基于Aspen-HYSYS V7.2进行了流程优化模拟。结果显示,该流程可得到摩尔含氢量小于等于0.01%的高纯度液化天然气(Liquefied Natural Gas,LNG)产品,同时,通过整合液化流程和精馏脱氢过程的能量利用,液化精馏脱氢联合流程的单位能耗较液化闪蒸脱氢流程降低了10%。

Hydrogen component brings remarkable influence on the thermal property of synthetic natural gas(SNG),which causes high requirement for SNG liquefaction process and storage equipment.Therefore,a liquefaction and distillation dehydrogenization integrated process specially designed for low hydrogen-containing natural gas(mole hydrogen composition < 5%) has been come up and optimized based on Aspen-HYSYS V7.2 in this paper.The results indicate that highly purified liquefied natural gas(LNG) with hydrogen mole composition limited within 0.01%can be achieved with a unit energy consumption reduction of 10%compared with the liquefaction and flash-evaporation process.