| In recent years,how to explore and utilize clean and renewable energy has become the hot spot of politic and industrial activities.Hydrogen as a clean and renewable energy carrier and its unit mass calorific value is high.Therefore,hydrogen is always treated as human future ideal energy.Hydrogen efficient utilization is closely related with hydrogen purification,production,storage,transportation and safely use,etc.And hydrogen purification is of great significance into the flied of chemical,food and automobile.Hydrogen productions from industrial catalytic crack process usually contain various impurities,like CO,CO2,CH4 and N2,etc.How to separate these impurities gases to obtain pure hydrogen becomes the bottleneck of efficient utilization of hydrogen.The main objective of this work is to study the hydrogen purification using PSA（Pressure Swing Adsorption）and thermal effects of gas adsorption on purification performance.Based on the thermodynamics basic principles,integrated with mass,energy and momentum conservation during multi-components gases breakthrough the adsorbent bed layer.The multi-components adsorption models are implemented on the multi-physicals coupling software Comsol and chemical process software Aspen Adsim and the model is validated by experiments and improved.Firstly,Matlab curve fitting tool is applied to fit isotherm experiment data of pure gas adsorption on the adsorbent in order to obtain Langmuir isotherm parameters that relate to temperature.Based on thermodynamics,hydromechanics and mass and heat transfer,a multi-component adsorption model is developed.And the initial conditions and boundary conditions of model are given.Secondly,the influence of adsorption bed structure on gases breakthrough curves and thermal effects are studied comprehensively.A ternary mixture（H2,CO and CH4）is feed to activated carbon and zeolite bed,the mixture breakthrough curves and thermal effects produced from adsorption process are studied.Furthermore,an annularly novel dual bed for hydrogen purification PSA process is simulated.The breakthrough curves of a quaternary mixture（H2,CO2,CH4 and CO）at the annularly dual bed system and at the single bed system are studied and the thermal effects during gases breakthrough adsorption bed are analyzed.Besides,we study the breakthrough curves of a quaternary mixture（H2,CO2,CH4 and CO）adsorption on the layered bed filled with activated carbon and zeolite adsorbent material,and focused on studying the effect of system heat exchange condition,environment temperature and height ratio of activated carbon and zeolite on gases breakthrough curves and bed temperature.Finally,in view of the new type of metal organic frameworks（MOFs）adsorbent PSA system,we study the thermal effects on breakthrough curves of ternary mixture（H2,CO and CH4）in Cu-BTC adsorption bed during adsorption and desorption processes. |
