Process Integration for Food Drying with Air Dehumidified by Zeolites

Zeolites have potential to increase efficiency of medium-temperature drying in the food industry. This work concerns the comparison between conventional dryers and dryers using air dehumidified by zeolite. Steady-state mass and energy balances have been used and the work concerns drying temperatures ranging from 52 to 70°C. Process integration based on pinch analysis has been applied and nine different heat exchanger networks for energy recovery are compared. Results indicated that dryers using air dehumidifier by zeolites are 10–18% more efficient than conventional dryers.

[1]  Kai Choong Leong,et al.  Numerical modeling of combined heat and mass transfer in the adsorbent bed of a zeolite/water cooling system , 2004 .

[2]  F. Kapteijn,et al.  Water vapour separation from permanent gases by a zeolite-4A membrane , 2005 .

[3]  G. Osorio-Revilla,et al.  Immersion Drying of Wheat Using Al-PILC, Zeolite, Clay, and Sand as Particulate Media , 2006 .

[4]  Russell F Dunn,et al.  Using process integration technology for CLEANER production , 2001 .

[5]  A.J.B. van Boxtel,et al.  Modelling of Fluidized-bed Drying of Black Tea , 1999 .

[6]  E. Kakaras,et al.  Computer simulation studies for the integration of an external dryer into a Greek lignite-fired power plant , 2002 .

[7]  H. C. van Deventer.  Feasibility of energy efficient steam drying of paper and textile including process integration , 1997 .

[8]  R. M. Wood,et al.  Estimation of the installed cost of heat exchanger networks , 1993 .

[9]  Kai Choong Leong,et al.  The effect of operating conditions on the performance of zeolite/water adsorption cooling systems , 2005 .

[10]  Pingjing Yao,et al.  Application of total process energy-integration in retrofitting an ammonia plant , 2003 .

[11]  Simon Perry,et al.  Heat integration retrofit analysis of a heat exchanger network of a fluid catalytic cracking plant , 2001 .

[12]  Don W. Green,et al.  Perry's Chemical Engineers' Handbook , 2007 .

[13]  Wen-Ruey Chang,et al.  Performance comparison with effect of door opening on variable and fixed frequency refrigerators/freezers , 2004 .

[14]  D. A. White,et al.  Water sorption properties of modified clinoptilolite , 1997 .

[15]  Bodo Linnhoff,et al.  A User guide on process integration for the efficient use of energy , 1994 .

[16]  Michael J Tierney,et al.  Drying saturated zeolite pellets to assess fluidised bed performance , 2002 .

[17]  Ljubica Matijašević,et al.  Energy recovery by pinch technology , 2002 .

[18]  K. F. Knoche,et al.  Pinch analysis for cooling towers , 1998 .

[19]  Jorge Islas,et al.  Pinch technology application in a hospital , 2003 .

[20]  Tadeusz Kudra,et al.  Energy Aspects in Drying , 2004 .

[21]  James M. Douglas,et al.  Conceptual Design of Chemical Processes , 1988 .

[23]  Ian C. Kemp,et al.  Reducing Dryer Energy Use by Process Integration and Pinch Analysis , 2005 .