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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

DEVELOPMENT AND EXPERIMENTAL ANALYSIS ON THE PERFORMANCE OF COMPOSITE CONSOLIDATED SILICA GEL FABRICATED BY FREEZE-DRYING METHOD

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.022616
pages 4993-5003

Sinopsis

Experimental investigation of new composite consolidated adsorbents have been carried out with the purpose of testing the performance of heat and mass transfer. Two types of composite consolidated adsorbents, i.e. consolidated silica gel with carboxymethyl cellulose (SC) and consolidated silica gel, carboxymethyl cellulose and carbon fiber powders (SCC), have been developed by the freeze-drying method. Results indicate that the thermal conductivity is the function of the contents of carbon fiber powder and moisture in the semi-finished wet mixture during the freeze drying process. The thermal conductivity increases with the increasing proportion of carbon fiber powder, while decreases with the increasing moisture content. The SC20 and SCC20 (20 refers to the water content of 20% in the semi-finished wet mixture) have the thermal conductivity respectively 4.6 and 6.7 times greater than that of pure silica gel. Due to the addition of carboxymethyl cellulose and carbon fiber powders, the intra-particle and inter- particle pores of silica gel are blocked and lead to the decrease of specific surface area, pore volume, porosity and permeability. The mass transfer performance and adsorption performance of the consolidated composite adsorbents have been studied and compared with SC20V and SCC20V sample prepared by vacuum-drying method . The results found that the SC20 and SCC20 have a preferable mass transfer and adsorption performance than SC20V and SCC20V, which illustrates the way combined freeze drying with consolidation is an effective method to simultaneously enhance the heat and mass transfer performance of adsorbents.