In this work, the separation of carbon dioxide （CO2） from （PSA） column was modeled and simulated. The adsorption kinetics the methane （CH4） using fixed bed Pressure Swing Adsorption on the 13X zeolite adsorbent ...In this work, the separation of carbon dioxide （CO2） from （PSA） column was modeled and simulated. The adsorption kinetics the methane （CH4） using fixed bed Pressure Swing Adsorption on the 13X zeolite adsorbent was described by Linear Driving Force （LDF） model. Simulation of adsorption phenomena inside the fixed bed was implemented using Computational Fluid Dynamic （CFD） method, based on porous media concept, and the mass transfer coefficients for gas components （COz and CH4） were developed using User Defined Scalars （UDS）. The model was validated by comparing with the experimental data, which were collected based on a varied set of laboratory conditions. The prediction of the adsorption isotherm （uptake curve） and methane recovery using the simulation results exhibited a reasonable agreement with the experimental data. Moreover, the effects of feed flow rate and bed concentration evolution were investigated. The current results suggested that CFD approach is capable to predicate the hydrodynamics and adsorption phenomena in the fixed bed adsorption column.展开更多
本文设计开发了一种吸附式制冷系统,采用分体式双床结构,以85~100℃的低品位热水作为驱动热源,通过两个吸附床对制冷剂-水的交替吸附和解吸,实现连续制冷。吸附床采用翅片管式换热器,翅片表面涂覆了新型研制的13X分子筛-氯化钙复合吸附...本文设计开发了一种吸附式制冷系统,采用分体式双床结构,以85~100℃的低品位热水作为驱动热源,通过两个吸附床对制冷剂-水的交替吸附和解吸,实现连续制冷。吸附床采用翅片管式换热器,翅片表面涂覆了新型研制的13X分子筛-氯化钙复合吸附剂,涂覆厚度仅0.15 mm,加速了吸附/解吸速率以及传热速率。蒸发器采用盘管和水盘结构,且从上而下呈阶梯状间隔分布,保证蒸发时换热管表面均进行高效的沸腾换热。冷凝器的设计上增加了不凝气体排放装置,可在系统运行的过程中随时抽取不凝性气体,维持了冷凝器的高换热效率。还从强度、密封性以及装配结构紧凑性等方面对各个换热器箱体结构进行了优化设计。此外,所述吸附制冷系统循环中引入了回质和回热过程。基于此循环模式,对系统性能进行了测试可知:以85℃的热水作为解吸热源时,系统制冷功率为7.7 k W,性能系数COP为0.467,SCP为380 W/kg,平均耗电量1.23 k W。展开更多
文摘In this work, the separation of carbon dioxide （CO2） from （PSA） column was modeled and simulated. The adsorption kinetics the methane （CH4） using fixed bed Pressure Swing Adsorption on the 13X zeolite adsorbent was described by Linear Driving Force （LDF） model. Simulation of adsorption phenomena inside the fixed bed was implemented using Computational Fluid Dynamic （CFD） method, based on porous media concept, and the mass transfer coefficients for gas components （COz and CH4） were developed using User Defined Scalars （UDS）. The model was validated by comparing with the experimental data, which were collected based on a varied set of laboratory conditions. The prediction of the adsorption isotherm （uptake curve） and methane recovery using the simulation results exhibited a reasonable agreement with the experimental data. Moreover, the effects of feed flow rate and bed concentration evolution were investigated. The current results suggested that CFD approach is capable to predicate the hydrodynamics and adsorption phenomena in the fixed bed adsorption column.
文摘本文设计开发了一种吸附式制冷系统,采用分体式双床结构,以85~100℃的低品位热水作为驱动热源,通过两个吸附床对制冷剂-水的交替吸附和解吸,实现连续制冷。吸附床采用翅片管式换热器,翅片表面涂覆了新型研制的13X分子筛-氯化钙复合吸附剂,涂覆厚度仅0.15 mm,加速了吸附/解吸速率以及传热速率。蒸发器采用盘管和水盘结构,且从上而下呈阶梯状间隔分布,保证蒸发时换热管表面均进行高效的沸腾换热。冷凝器的设计上增加了不凝气体排放装置,可在系统运行的过程中随时抽取不凝性气体,维持了冷凝器的高换热效率。还从强度、密封性以及装配结构紧凑性等方面对各个换热器箱体结构进行了优化设计。此外,所述吸附制冷系统循环中引入了回质和回热过程。基于此循环模式,对系统性能进行了测试可知:以85℃的热水作为解吸热源时,系统制冷功率为7.7 k W,性能系数COP为0.467,SCP为380 W/kg,平均耗电量1.23 k W。
