Study of Adsorption Dynamics for 5A Molecular Sieve Material in Manned Spacecraft

Air revitalization technology of environment control and life support system (ECLSS) should be developed for the long-time orbit mission of manned spacecraft. Two kinds of molecular sieve materials, TC-5A and PSA-5A, have made on request by China's manned space development demand, and the dynamic model of adsorbent bed in CO2 removal subsystem is established. As the physical and the dynamics Parameters is known, the simulation shows the results as CO2 concentration and temperature changes. The adsorbing experiment is established to verify the effectiveness of dynamic model, besides, it analyzed the adsorption performance in condition of different concentration and temperature. Study shows that established dynamic model of adsorption bed fit well with experiments and can reflect the adsorption process of two kinds of adsorption material. The modeling can be used as a part of the system simulation or system fault prediction and analysis in near future. In addition, temperature is the main factor of adsorption performance for two kinds of molecular sieves materials, the adsorption capacity sharply dropped as the adsorbing temperature rises. So the adsorbing temperature is the priority consideration when air revitalization system designed, so as to make sure the adsorbing is effective.