Experimental study on helium extraction by membrane separation and PSA coupling process
China is short of helium resources and mainly relies on imports.In recent years,two different types of helium gas resources have been discovered in multiple basins.Helium containing natural gas resources are abundant but of low grade,while geothermal water soluble associated helium gas has high grade.However,due to the limitation of geothermal water extraction,the recoverable resources are relatively small and have not yet reached the stage of industrial utilization.At present,deep cooling technology is mainly used for helium extraction at home and abroad,which has problems of high energy consumption and poor economic efficiency when applied in China.This article presents an experimental study on the extraction process of water-soluble helium using a room temperature membrane method.Membrane separation at normal temperature and pressure swing adsorption(PSA)coupled process of geothermal water soluble helium extraction was carried out in Sanpu No.2 geothermal well.It has enriched the concentration of helium with volume fraction of about 3％to about 50％through membrane separation,and the concentration of enriched helium is further improved to more than 99％by pressure swing adsorption process.The experiment of helium extraction,through coupling process of membrane separation at normal temperature and pressure swing adsorption technology,has completed with a great success for the first time in China.This technology is about to be transformed and applied to natural gas field extraction in China,which plays an important role in solving the contradiction between helium supply and demand in China and reducing external dependence.
NETL
NSTL
万方数据
维普
