Heat efficiency of multi-stage zeolite systems for low temperature drying

M. Djaeni, G. van Straten, A.J.B. van Boxtel, P.V. Bartels, J.P.M. Sanders

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademicpeer-review


This work presents the evaluation of multi-stage adsorption dryers with air dehumidification by zeolite and alumina pillared clay. In a multi-stage dryer product is dried in a number of succeeding stages and for each stage the air is dehumidified by the adsorbent. The exhaust air from each stage is reused for product drying in a following stage after passing a bed with adsorbent. The heat efficiency of the drying system is evaluated and compared with a conventional drying system using air dehumidified by condensation. The evaluation concerns the effect of stage number, inlet dryer temperatures 10-50°C and inlet ambient air 10-25°C. Results show that the performance of the multi-stage adsorption dryers increases with the number of stages and a three stage system is economically most promising. For varying ambient air conditions, zeolite as adsorbent is the most favourable.
Original languageEnglish
Title of host publicationProceedings of The 5th Asia-Pacific Drying Conference, Hong Kong, China, 13 - 15 August, 2007
Place of PublicationHong Kong
Publication statusPublished - 2007
EventThe 5th Asia-Pacific Drying Conference -
Duration: 13 Aug 200715 Aug 2007


ConferenceThe 5th Asia-Pacific Drying Conference


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