Development of Fluidized Bed Heat Exchanger Using Organic Powder

通过实验研究了聚丙烯酸钠桥接配合物组成的粉状有机吸附剂作为一种新型吸附材料的热物理性质和动态吸附/解吸特性。采用瞬态热丝法测定了粉末吸收剂在不同温度和湿度下的有效导热系数。采用流化床系统对粉末吸附剂的动态吸附/解吸特性进行了测试。将粉末吸附剂颗粒装入矩形容器中，并从容器底部吹入空气。实验在不同的空气温度、相对湿度和流速条件下进行。研究发现，湿空气进入粉末吸附剂颗粒层的吸附和解吸过程均为等焓变。最后，通过雷诺数、施密特数、吸附水蒸气质量比和斯蒂芬数，将得到的传质Sherwood数与吸附和解吸过程的无因次完成时间进行关联。

Experimental investigations has been performed to determine thermophysical properties and dynamic adsorption/desorption characteristics of powder type organic absorbent composed bridged complex of sodium polyacrylate as a new kind of adsorption material. The effective thermal conductivity was measured with the transient hot wire method under various temperature and humidity of the powder absorbent. The dynamic adsorption/desorption characteristics of the powder adsorbent were also measured by using fluidized bed system. The powder adsorbent particles were packed into a rectangular vessel, and the air was flown from the bottom of the vessel. The experiments were carried out under various air temperature, relative humidity and flow velocity conditions. It was found that both adsorption and desorption processes of passing a moist air into the powder adsorbent particles layers were the isoenthalpy change. Finally, the obtained data of Sherwood number for mass transfer and nondimenional completion time for adsorption and desorption processes were correlated by means of Reynolds number, schmidt number, adsorbed water vapor mass ratio, and Stefan number.