含添加剂沸石分子筛混合吸附剂物理特性及其制冷应用性能  

Physical properties and refrigeration performance of compound adsorbent composed of additive and zeolite molecular sieve

作　　者：武卫东[1] 王闯[1] 孟晓伟[1] 张华[1] 

机构地区：[1]上海理工大学制冷与低温工程研究所,上海200093

出　　处：《化工进展》2016年第3期692-699,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(50606027);教育部留学回国人员科研启动基金;上海市自然科学基金(14ZR1429000)项目

摘　　要：为改善吸附剂用于吸附制冷的传热传质性能,以微米级铁粉、铝粉和非金属膨胀石墨为添加剂,制备了8种不同烧结型13X沸石分子筛(包括粉末型和颗粒型)混合吸附剂,对其进行了SEM观察以及热导率、吸附等温线、孔径分布等物性的测量与表征分析。结果显示,添加剂为膨胀石墨的粉末型分子筛微粒之间的紧密型最好,接触面积最大;添加剂为铝粉的粉末型分子筛热导率和热扩散系数最高,相比纯组分颗粒型分子筛的分别提高了100.9%和315.6%,添加剂为铁粉的粉末型分子筛比热容最低,相比纯组分颗粒型分子筛的降低了33.9%;加入添加剂的粉末型和颗粒型分子筛的比表面积和孔隙率都有不同程度的降低,其顺序由高到低均为膨胀石墨、铝粉、铁粉。将制备的各种混合吸附剂应用于吸附制冷单元管进行实验测试,讨论分析了其循环周期、制冷量、COP和SCP等性能指标的改进与吸附剂物性改变之间的内在联系。To improve adsorbent＇s heat and mass transfer performance used for adsorption refrigeration,we prepared eight sintering compound adsorbents composed of 13 X zeolite（both powders and granular type） and additives（including micron-sized iron,aluminum and expandable graphite）. SEM observation as well as measurement and characterization analysis of thermal conductivity,adsorption isotherm,pore size distribution and other physical properties were carried out. The results showed that the powder zeolite with expanded graphite as additive had the best compact and the largest contact area among zeolite particles. The powder zeolite with aluminum powder as additive had the highest thermal conductivity and thermal diffusivity,increased by 100.9% and 315.6%,respectively,compared with pure component granular zeolite. The powder zeolite with iron powder had the lowest heat capacity,decreased by 33.9% compared with pure granular zeolite. The specific surface area and porosity of powder and granular zeolites were reduced due to the addition of additives. The various types of compound adsorbents studied were employed in adsorption refrigeration unit tube,and relevant performance experiments were carried out. The internal mechanisms between improvement of the adsorption refrigeration tube＇s performance indexes（i.e.,cycle time,cooling capacity,COP and SCP） and respective physical properties of these compound adsorbents were discussed.

关 键 词：微米级 金属添加剂 13X沸石分子筛 混合吸附剂 物性 吸附单元冷管 性能 

分 类 号：TB64[一般工业技术—制冷工程] TB69