Study On Hygroscopicity And Regeneration Performance Of Commonly Used Solid Adsorbents

China's hot summer and cold winter regions have abundant rainfall,and the proportion of wet time in a year is large.Long-term in a humid climate environment not only brings inconvenience to people's work,life and production,but also easily breeds pathogenic microorganisms and bacteria.And mold,etc.,and at the same time lead to poor air quality,so air dehumidification is one of the important tasks we have to accomplish,and we must also consider the issue of energy saving while dehumidifying.At present,scholars at home and abroad have done a lot of research on dehumidification methods,and have improved various regeneration methods of materials.Air dehumidification methods include condensation dehumidification,membrane dehumidification,solid dehumidification,liquid dehumidification and other technologies.Infiltration regeneration,ultrasonic regeneration,microwave regeneration,heating regeneration,etc.,this paper mainly studies solid adsorption dehumidification and heating desorption regeneration.In order to solve the problem of high humidity in our daily life environment and to explore the characteristics of wet migration during the process of moisture absorption and regeneration of solid adsorbent materials,this paper proposes to design and build a solid adsorbent for common porous media at room temperature adsorption dehumidification and high temperature desorption.A regenerative experimental test device platform is included,which includes a solid adsorbed air dehumidification system,a heating regeneration system,a temperature and humidity and gravity monitoring system,and the remaining associated conditioning equipment system.Through the established experimental test platform,the dehumidification performance and regeneration performance of silica gel,activated alumina and 13 X molecular sieve in the solid dehumidifier were tested experimentally,and the wet migration of silica gel,activated alumina and 13 X molecular sieve during moisture absorption and regeneration was studied.The characteristics and mass transfer mechanism,and the three solid dehumidifiers were compared experimentally to obtain the desiccant for deep dehumidification and complete desorption.The research results can provide a reference for the selection and engineering application of solid dehumidification materials.Through experimental tests,the dehumidification performance of the desiccant dehumidification plant materials,the test results are as follows: silica gel,activated alumina and 13 x molecular sieve effective moisture absorption time of 21 h respectively,9 and 12 h h,in the period of effective moisture removal were 262.06 g/kg,155.21 g/kg,210.28 g/kg,and the emergence of the maximum hourly moisture absorption is in the early stage of the process of moisture absorption were 4.63 g/kg,4.75 g/kg,7.3 g/kg;The curve of moisture absorption decreases logarithmically with test time,and the correlation is good.Without considering other factors,analysis of silica gel moisture content is higher than 13 x molecular sieve absorption moisture content is higher than that of activated alumina absorbent,desiccant performance is good,in the initial stage of 13 x molecular sieve hygroscopic and activated alumina dehumidification rate,moisture absorption effect is better,in the stable phase activated alumina restricted because of their specific surface area,etc and silica gel and 13 x molecular sieve in the dehumidifying effect on certain gap.The results of the regenerative performance test of the hygroscopic agent in the dehumidifier are as follows: the regeneration amount of silica gel,activated alumina and 13 X molecular sieve at 40 °C,60 °C,90 °C and 120 °C respectively,the regeneration amount is closely changed with the regeneration time and regeneration temperature.Correlatively,the regeneration amount showed a logarithmic growth trend with the prolongation of regeneration time;the logarithmically increasing law with the increase of regeneration temperature T;the maximum regeneration rate,average regeneration rate and regeneration efficiency increased with the increase of regeneration temperature.Large,and the regeneration time will also shorten with the increase of regeneration temperature.It is known that the regeneration rate and efficiency are positively correlated with the regeneration temperature of the treatment.The regeneration time is inversely related to the regeneration temperature.The whole device should be selected and kept as much as possible during the regeneration work.The optimal temperature range,in order to shorten the regeneration time,increase the regeneration rate and efficiency,so as to meet the requirements of energy saving;from the comparison of total power consumption and unit mass power consumption,it is concluded that silica gel,activated alumina and 13 X molecular sieves have the best effect when regenerated at 90 °C,and the unit mass power consumption is 2.672 KW·h,1.002 KW·h,1.169 KW·h.