改性活性炭—异丁烷吸附制冷性能研究

Investigation on Adsorption Refrigeration Characteristics of Modified Activated Carbon-Isobutane Pair

本文对活性炭表面进行氨水改性,对改性前后活性炭表面形貌和孔结构进行表征,测定氨水改性条件对活性炭表面基团含量及碘值的影响,研究改性活性炭对异丁烷的平衡吸附量,考察改性活性炭-异丁烷工质对的直接再生吸附制冷循环性能。结果表明:氨水改性较适宜条件为氨水浓度14 wt%、温度25℃、时间12 h;氨水改性活性炭表面碱性基团含量提高了45.7%,改性活性炭对异丁烷吸附量增加10.8%;改性活性炭-异丁烷工质对直接再生吸附制冷循环吸附量比未改性活性炭提高30.8%。

The activated carbon surface was modified by ammonia solution. The changes in surface morphology and pore structure of the activated carbon were characterized. The effects of modification conditions on the content of surface functional groups and iodine value were studied. The adsorbed isobutane amount of modified activated carbon was tested. The performance of the activated carbon-isobutane pair for direct regenerative adsorption refrigeration cycle was investigated. The results show that the feasible modification conditions were the ammonia solution concentration of 14 wt%, the temperature of 25oC, and the modification time of 12 h. In comparison with the original activated carbon, the basic functional groups and adsorption capacity for the activated carbon-isobutane were increased by 45.7% and 10.8%, respectively. The adsorption capacity of the modified activated carbon-isobutane pair for direct regenerative adsorption refrigeration cycle was improved by 30.8%than that of the original activated carbon.