煤制天然气液化流程初步研究

鉴于煤炭清洁利用的必要性以及国内天然气供不应求的格局,煤制天然气(SNG)具有了一定的发展空间。以液化的方式储运煤制天然气是应对我国特殊的天然气市场结构的较好选择。而由于煤制天然气与常规天然气不同的组成,特别是氢气的存在,需要为其设计专门的液化流程。为了给流程的设计提供参考,在HYSYS软件上模拟分析了常规天然气液化流程(氮气膨胀流程和混合制冷剂流程)用于液化煤制天然气的可行性及其特点,发现常规天然气液化流程可以用于液化煤制天然气,只是流程的单位能耗稍有增加。另外,还通过模拟分析了精馏分离氢气对液化流程所产生的影响。

Preliminary study on liquefaction process of synthetic natural gas

Based on the necessity of coal clean utilization and the serious shortage of natural gas supply in China,synthetic natural gas(SNG) certainly has space for development.Since SNG contains hydrogen,which does not exist in conventional natural gas,the special liquefaction process for SNG should be designed to maximize the efficiency of liquefaction system.For the future design of the special liquefaction process,this paper simulated and analyzed the conventional liquefaction process(nitrogen expansion cycle and mixed refrigerant cycle) to liquefy SNG with the software Aspen HYSYS.The result show that the conventional liquefaction process can be used to liquefy SNG,only a litter more energy is consumed.Additionally,the effects on the liquefaction process of the distillation,which was used to separate the hydrogen from SNG,were also simulated and analyzed.