关键词: 膜分离法, 聚酰亚胺中空纤维, 溶解-扩散机理, 脱硫率, 分离系数

Abstract:

Hollow polyimide fibers are selected as separation material to carry out the experiment of membrane separation approach used in H₂S removal from natural gas,and the principle is solution-diffusion mechanics.Several groups of experiment of different inlet velocity,membrane pressure difference and temperature transfer are carried out,in order to study inlet velocity and membrane pressure difference influences on desulfuration efficiency,the influencing factors of H₂S mass flux and mass coefficient and the impact of temperature transfer on separation efficiency.The experiment results prove that the desulfuration efficiency decreases following with the accretion of inlet velocity.The membrane pressure difference is the dominant influencing factor in desulfuration efficiency.The increasing of membrane pressure difference is in favor of enhancing H₂S mass transfer,however,CH₄ loss ratio increases.The calculation results show that the separation parameter has little to do with temperature transfer.Under experimental conditions,with the inlet gas H₂S 296mg/m3,the desulfurization efficiency of 97% is attained through single stage membrane module,and product gas H₂S content is below the pipeline transportation standards.The experiment provids a effective way of removing H₂S from natural gas.

Key words: membrane separation approach, hollow polyimide fibres, solution-diffusion mechanics, desulfuration efficiency, separation parameter