Hygroscopic Characteristics And Efficiency Of Several Porous Homogeneous Solid Materials

The rapid development of economy and technology makes people have higher and higher requirements on living standard,realizing the transition from adequate food and clothing to a more comfortable life.Many factors,such as relative humidity,air temperature,wind speed and radiation temperature,have important effects on the comfort level of people's environment.Among them,humidity is an important factor that directly or indirectly affects human thermal comfort.Excessive humidity in air will harm human health and affect industrial production.Therefore,the research on dehumidification technology is particularly important.At present,based on the excellent research results of experts and scholars,humidity regulation and regenerative desorption can be carried out through a variety of means to achieve the requirements of thermal comfort.Among them,the method of dehumidifying air with porous solid adsorbent has also been widely used.This paper starts from the hygroscopic and regenerative properties of several common solid desiccant in daily life,and studies its practicability in the range of room temperature.In view of this,this paper set up the moisture absorption and regeneration of the solid desiccant materials test bench,the common three kinds of desiccant pores of the silica gel,activated alumina and 13 X molecular sieve under different heating conditions wet heat analysis of characteristics and efficiency,and established the corresponding mathematical model for the regeneration process,to study the common solid desiccant materials under different regeneration conditions of regeneration of the feasibility of stripping.Specific experimental platform based on eight different regeneration condition(50 ?,60 ?,70 ?,80 ?,90 ?,100 ?,110 ?,120 ?),the actual measurement,from renewable materials dry basis moisture content in the process of regeneration,regeneration rate and efficiency of three aspects were analyzed.The results show that: during the whole regeneration process of fine porous silica gel,activated alumina and 13 X molecular sieve,the dry base moisture content and regeneration rate show a declining trend and the curves tend to be flat to reach the dynamic regeneration equilibrium point,but the regeneration efficiency increases with the passing of time.Under the same working condition,the total amount of regeneration is from less to more in the order of 13 X molecular sieve,active alumina and fine porous silica gel,and the average regeneration rate of the regeneration process of 13 X molecular sieve is also the smallest.The increase of regeneration temperature has obvious promoting effect on regeneration effect.As the temperature increases,the regeneration process of fine porous silica gel and activated alumina takes less time,while the 13 X molecular sieve takes longer time to remove more water and moisture content.Under the condition of heating temperature of 120 ?,silica gel and activated alumina pores can achieve full regeneration,and 13 X molecular sieve regeneration efficiency of only 0.935 when stop regeneration;13X molecular sieve pore silica gel,activated alumina and the heat analysis of wet process conforms to the thin layer drying kinetics model of Thompson model respectively,the Page model and revised Page model(?);The three solid dehumidifying materials,fine porous silica gel,activated alumina and 13 X molecular sieve,can be regenerated by heating to achieve the purpose of reuse.