Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 410013
Title Optimizing Energy Efficiency in Low Temperature Drying by Zeolite Adsorption and Process Integration
Author(s) Atuonwu, J.C.; Straten, G. van; Deventer, H. van; Boxtel, A.J.B. van
Source Chemical Engineering Transactions 25 (2011). - ISSN 1974-9791 - p. 111 - 116.
Department(s) Systems and Control Group
Publication type Refereed Article in a scientific journal
Publication year 2011
Abstract Drying is an energy intensive process, with low efficiencies, particularly at low drying temperatures required for heat-sensitive products. This work presents an energy efficient method for drying heat-sensitive products based on drying air dehumidification by zeolites and process integration. Two optimization approaches are considered: sequential and simultaneous. In the sequential approach, a zeolite adsorption dryer is optimized for energy efficiency, subject to product temperature and final moisture constraints using the zeolite, drying and regeneration air flowrates as well as the regeneration air inlet temperature as decision variables. Heat is then optimally recovered from the process exhaust streams using pinch analysis. In the simultaneous method, heat recovery is considered an integral part of the drying process and the entire system simultaneously optimized. Since the heat recovery stream properties are now unknown a priori, the pinch point is not unique but determined by optimization. The sequential and simultaneous methods reduce energy consumption by about 45 % and 55 % respectively, compared to a conventional convective dryer at the same drying temperature of 50 °C.
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