Abstract: In this paper,a non-equilibrium stage method,the differential unit method，which is suitable for the multi-stage separation technology of hydrate, is proposed to aim at separating hydrogen from H₂+CH₄ gas mixtures and using tetrahydrofuran as the promoter.The differential unit method is that a whole reactor is divided into a number of units whose number may converge at infinity; that is to say, every differential unit is regarded as an instantaneous reactor the moment its number converges at infinity.This method makes sure that the simulation is close to reality.A wetted column serves as the example to calculate the gas-solid composition as well as their load with the differential unit method.The effects of multi-stage separation are compared at different temperatures, pressures and flow rates.The lower the temperature is, the more highly hydrogen is purified, and the higher the pressure is, the more highly hydrogen is purified.

Key words: 水合物分离, 非平衡级, 微元法, 四氢呋喃

摘要： 针对H₂+CH₄体系在四氢呋喃(THF)水溶液中H₂的分离，提出了适合水合物多级分离技术的非平衡级算法——微元法，对此方法做了详尽的阐述.以湿壁塔为例，采用微元法计算了气、固相组成及其负荷，同时对不同温度、压力以及流量对水合物多级分离的影响做了比较.

关键词: 水合物分离, 非平衡级, 微元法, 四氢呋喃