膜分离与变压吸附耦合工艺提氦试验研究

Experimental study on helium extraction by membrane separation and PSA coupling process

我国氦气资源贫乏,主要依靠进口.近年来,已在多个盆地发现2种不同类型的氦气资源,其中含氦天然气资源丰富但品位低,地热水溶性伴生氦气品位高,但受限于地热水的开采,可采资源量较小,还未到工业化利用阶段.目前国内外氦气提取主要采用深冷法技术,应用在我国存在能耗高、经济性差的问题.在三普2号地热井开展地热水溶氦气的常温膜分离与变压吸附耦合工艺提取试验,将体积分数为3%左右的氦气利用膜分离工艺提浓至50%左右,提浓后的气体再利用变压吸附工艺提纯至99%以上,通过2种技术的联合运用,在国内首次完成了常温膜分离与变压吸附技术耦合工艺提氦试验.该技术也即将成果转化,应用到我国的天然气田提氦,对解决我国氦气供需矛盾、降低对外依存度具有重要的作用.

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.