Modeling the adsorption of mixed gases based on pure gas adsorption properties

Cryogenic Engineering Conference 2015

材料科学;物理学

Tzabar, N.^1 ; Holland, H.J.^1 ; Vermeer, C.H.^1 ; Ter Brake, H.J.M.^1

Energy, Materials and Systems, Faculty of Science and Technology, University of Twente, AE Enschede

7500, Netherlands^1

关键词: Adsorption characteristic;    Adsorption properties;    Joule-Thomson cryocoolers;    Mixed refrigerants;    Mixed-gas adsorptions;    Pure refrigerants;    Separation process;    Steady-state condition;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012169/pdf
DOI  :  10.1088/1757-899X/101/1/012169

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Sorption-based Joule-Thomson (JT) cryocoolers usually operate with pure gases. A sorption-based compressor has many benefits; however, it is limited by the pressure ratios it can provide. Using a mixed-refrigerant (MR) instead of a pure refrigerant in JT cryocoolers allows working at much lower pressure ratios. Therefore, it is attractive using MRs in sorption-based cryocoolers in order to reduce one of its main limitations. The adsorption of mixed gases is usually investigated under steady-state conditions, mainly for storage and separation processes. However, the process in a sorption compressor goes through various temperatures, pressures and adsorption concentrations; therefore, it differs from the common mixed gases adsorption applications. In order to simulate the sorption process in a compressor a numerical analysis for mixed gases is developed, based on pure gas adsorption characteristics. The pure gas adsorption properties have been measured for four gases (nitrogen, methane, ethane, and propane) with Norit-RB2 activated carbon. A single adsorption model is desired to describe the adsorption of all four gases. This model is further developed to a mixed-gas adsorption model. In future work more adsorbents will be tested using these four gases and the adsorption model will be verified against experimental results of mixed-gas adsorption measurements.