不同吸附量条件下氯化锶混合吸附剂—氨的导热系数与渗透率研究  

Study on the Thermal Conductivity and Permeability of Composite SrCl2-NH3 Working Pair under the Condition of Different Values for Adsorption Quantity

作　　者：江龙[1] 金哲权[1] 王丽伟[1] 王如竹[1] 

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200240

出　　处：《制冷学报》2013年第3期35-39,共5页Journal of Refrigeration

摘　　要：氯化锶作为一种化学吸附剂,其主要特征是在吸附与解吸过程中会出现膨胀与结块现象,这种现象会进一步影响到吸附剂的导热系数与渗透率。为了确定在这种条件下氯化锶的导热系数与渗透率变化规律,研究中先选择膨胀石墨为基质对氯化锶进行了传热强化。即按照3种不同比例、2种不同固化密度配制了氯化锶/膨胀石墨固化混合吸附剂,然后在不同吸附量的条件下采用稳态法以及Ergun模型原理对样品进行了导热系数和渗透率测试。测试结果表明,随着制冷剂含量的升高,氯化锶化学吸附剂导热系数值增加幅度偏大。当配制比例为83%,固化密度为450kg/m3时,其导热系数可从0.88W/(m.K)最高上升至1.61W/(m.K),同时氯化锶混合吸附剂渗透率随着制冷剂含量的升高而有所下降。Strontium chloride as one chemical adsorbent is characterized by swelling and agglomeration phenomena in adsorption/desorp- tion process, which will further affect the thermal conductivity and permeability of the adsorbent. In order to determine the rules of thermal conductivity and permeability of strontium chloride under such conditions, expanded natural graphite is selected to enhance the heat and mass transfer of strontium chloride. Three kinds of different proportions as well as two kinds of different densities of strontium chloride compact adsorbents are selected to be tested for thermal conductivity and permeability by steady - heat method and Ergun model respec- tively. Results show that the thermal conductivity of compact adsorbents increases with the increasing ammonia contents, and the values of strontium chloride increase from 0.88W/（m.K） to 1.61W/（ m. K）. Permeability of compact adsorbent of strontium chloride decreases with the rise of the refrigerant content.

关 键 词：固化吸附剂 导热系数 渗透率 氯化锶 

分 类 号：TQ424[化学工程] TK124[动力工程及工程热物理—工程热物理]