化学聚合法强化吸附剂热传导

INVESTIGATION ON ENHANCEMENT THERMAL CONDUCTIVITY OF ADSORBENT BY USING POLYMERIZATION

采用化学聚合法强化吸附剂——沸石颗粒的热传导性能,利用苯胺单体在沸石颗粒表面氧化聚合,使少量的聚苯胺形成均匀连续的导热性能好的高分子材料网,在实验条件下可使该种吸附剂的有效导热系数提高到原来的4倍多。同时,将强化后的吸附剂挤压成型,进行强化吸附床层的传热研究,结果表明堆积密度为原来的1.5倍的成型块,其有效导热系数比原来提高30％,对比混合法的实验和数据分析表明,化学聚合法较物理混合法效果更明显,是一种适宜吸附剂热传导强化的新途径。

A method for improving the heat and mass transfer of adsorbent is developed in this paper. A thennal conductive polyaniline was firstly used for enhancing the thennal conductivity of adsorbent pellets. A thermally conductive composite of polyaniline and adsorbent was prepared by chemical oxidative in - situ polymerization of aniline onto the surface of adsorbent particles. A thin thermal conducting layer on the surface of adsorbent particles was grown. The experimental results indicated that the thermal conductivity of this composite could be increased by approximately 4 times that of pure adsorbent. The adsorbent bed was shaped by a pressing process. This process can reduce the thennal resistance among the adsorbent particles and the contact thermal resistance between adsorbent bed and the heat exchanger. The thermal conductivity of the bed itself from the tests can be increased by 30% when the density of the solid adsorption bed is 1.5 times of its original density. Comparing the results with different methods of mixing or coating polymer, the method of polymerization is one of the best to improve the thennal conductivity of adsorbent in heat pump system.