Study on Low-temperature Ultra-high Purity Hydrogen Purification Method
Hydrogen energy is an important clean energy that is being vigorously developed.Hydrogen has high require-ments for its gas purity during use.With the rapid development of the fuel cell and semiconductor industries,the requirements for hydrogen purity are more stringent,and the general purity requirements are 5N～6N,which poses a greater challenge for the development of efficient hydrogen purification processes.This paper is based on the demand for hydrogen purification with a purity of more than 99%recovered during liquid hydrogen preparation and liquid hydrogen filling in a large-scale hydrogen liquefaction plant.In this paper,four kinds of hydrogen purification processes,such as low temperature adsorption,pressure swing adsorption,palladium alloy diffusion(membrane separation)and metal hydrogen absorption,were compared and ana-lyzed.The adsorption effect of large granular activated carbon on hydrogen and nitrogen in liquid nitrogen temperature region was studied by experiments.At the same time,the purification process of ultra-high purity hydrogen(6N)with more than 99%purity was designed by low temperature adsorption method,and the low temperature adsorption process was modeled,analyzed and optimized by numerical simulation software.The purpose is to explore and develop a large flow,high purity,stable and reliable,economical and efficient ultra-high purity hydrogen purification process suitable for industrial production.
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