新型复合固体除湿材料的吸附和解吸性能研究  

Study on adsorption and desorption of new composite solid dehumidification materials

作　　者：何晨晨 陈柳[1] He Chenchen;Chen Liu(Energy School,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学能源学院,西安710054

出　　处：《低温与超导》2020年第4期58-65,共8页Cryogenics and Superconductivity

基　　金：国家自然科学基金项目(51404191)。

摘　　要：为实现固体除湿系统吸附材料的低温再生及提高吸附材料的除湿效率,制备了新型复合固体除湿材料。新型复合固体除湿材料是以陶瓷纤维为基质,运用MgCl2浸渍改性硅胶及CaCl2二次强化方法而形成的复合物,复合固体除湿材料中MgCl2和CaCl2浓度均为25%。通过恒温恒湿空调室实验研究温度、风速、湿度对MgCl2/CaCl2改性复合材料除湿性能及再生特性。实验表明:在温度20℃、湿度70%条件下,复合固体除湿材料除湿量可达161 mg/g,是未改性除湿材料的3.2倍,是单一改性除湿材料的1.3倍;当系统平衡时,其除湿速率分别是未改性除湿材料的6.1倍,是单一改性除湿材料的2.6倍。除湿材料的平衡吸附量和吸附速率均与相对湿度成正比,与温度成反比;且风速在0.5 m/s条件时具有最大的除湿量。同时,在约70℃较低的脱附温度,8 min可脱附≥90%的总吸附水量,每1 g吸附剂可脱附水量高达145 mg;脱附再生6次后,除湿量依然较高为138 mg/g,且基本不再变化。To realize the low-temperature regeneration of the adsorbent materials in solid dehumidification system and improve the dehumidification efficiency of the adsorbent materials, a new composite solid dehumidification material was prepared. The new composite solid dehumidification material was based on ceramic fiber and was a composite formed by the method of MgCl2 impregnated modified silicone and CaCl2 secondary reinforcement. The concentrations of MgCl2 and CaCl2 in composite solid dehumidification materials were 25%. The dehumidification performance and regeneration characteristics of MgCl2/CaCl2 modified composites were studied by temperature, wind speed and humidity in a constant temperature and humidity air conditioning. The experiments show that the dehumidification capacity of the composite solid dehumidification material can up to 161 mg/g at a temperature of 20 °C and a humidity of 70%, which is 3.2 times that of the unmodified dehumidification material and 1.3 times that of the single modified dehumidification material. When the system is balanced, the dehumidification rate is 6.1 times that of the unmodified dehumidification material and 2.6 times that of the single modified dehumidification material. The equilibrium adsorption capacity and adsorption rate of the dehumidification material are proportional to the relative humidity and inversely proportional to the temperature, and the wind speed is 0.5 m/s, which has the maximum dehumidification. At a lower desorption temperature of about 70 °C, more than 90% of the total amount of adsorbed water can be desorbed in 8 min, and the amount of adsorbed water per gram of adsorbent is as high as 145 mg. After desorption and regeneration for 6 times, the dehumidification amount is still high at 138 mg/g, and no longer changes.

关 键 词：固体吸附 改性硅胶 除湿性能 再生 

分 类 号：TU834.9[建筑科学—供热、供燃气、通风及空调工程]