Simulation design of process of low-temperature and membrane separation for helium extraction and LNG co-production from natural gas
In order to solve the problems of high energy consumption,low helium extraction efficiency and high economic cost of traditional helium extraction process,the process of low-temperature and membrane separation for helium extraction from natural gas and the process of low-temperature helium extraction and LNG co-production from natural gas were analyzed.Combined with the advantages of each process,the process of low-temperature and menbrane separtion for helium extraction and LNG co-production from natural gas was designed.Aspen HYSYS software was used to simulate the comprehensive energy consumption,helium recovery rate and helium content(volume fraction,the same as below)of the three processes.The results show that the helium recovery rate of the process of low-temperature and membrane separation for helium extraction and LNG co-production from natural gas is the highest when the condition of the minimum operating temperature is-188.3℃,which can reach 99.99%.The extracted helium content is the highest(up to 99.95%),and LNG production is 678.4 kmol/h,and LNG liquefaction rate is 94.6%.Compared with the operational parameters of the process of low-temperature and membrane separation for helium extraction from natural gas and the process of low-temperature helium extraction and LNG co-production from natural gas,the total compressor energy consumption of the process of low-temperature and membrane separation for helium extraction and LNG co-production from natural gas is reduced by 12.68%,and the comprehensive energy consumption of the device is reduced by 18.75%.The final process of low-temperature and membrane separation for helium extraction and LNG co-production from natural gas can effectively improve helium recovery rate and purity,reduce energy consumption and investment costs,maximize energy utilization,and produce two products(refined helium and LNG)at the same time.
natural gaslow-temperature and membrane separationhelium extractionLNG co-productionprocess simulation
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