熔融盐膜法脱除航天舱中CO2传质模型The Mathematical Model for Carbon Dioxide Removal from Cabin Gas of Spacecraft Using a Molten Salt Membrane
刘金盾,万亚珍,张浩勤,张永战,方文骥
摘要(Abstract)：
基于电化学理论、膜分离与传质理论,采用非平衡态热力学,建立了熔融盐(43.5% Li2CO3 + 25% K2CO3 +31.5% Na2CO3)( mol. %) 膜法脱除CO2数学模型。首先,根据熔盐体系离子的Hittorf迁移数、比电导、扩散系数等独立实验参数,计算得到体系的Onsager系数和模型参数,然后用计算机求得该模型的数值解。解的结果表明: 影响CO2 传质通量的因素主要有电流密度及CO2在膜两侧的浓度差。在低电流密度下,浓差推动力起主导作用;在较高电流密度下,膜两侧浓差推动力对CO2 传质影响甚微,电流密度对CO2的传质则起着决定性作用。为了进一步验证数学模型,在823 K及常压条件下,模拟航天舱中的气体成分,进行了熔融盐膜法脱除CO2的实验研究。实验结果与模型理论解吻合较好。
关键词(KeyWords)： 熔盐膜;二氧化碳;传质;非平衡态热力学;数学模型
基金项目(Foundation): 国家自然科学基金资助项目 (29207048)
作者(Author): 刘金盾,万亚珍,张浩勤,张永战,方文骥
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