Adaptation of the multi-effect distillation (MED) process to yield high purity distillate for utilities, refineries and chemical industry
✍ Scribed by A. Ophir; A. Gendel
- Book ID
- 103055580
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 477 KB
- Volume
- 98
- Category
- Article
- ISSN
- 0011-9164
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✦ Synopsis
SUhtMARY
A unique design of the MED effects (evaporator/condensers) was developed in order to minimize energy losses and space requirements for optimal carry over separation properties as required to achieve high quality distillate. The design of this evaporator is characterized by very low thermal loads, by coaxial and very low velocity vapor flow and a very compact utilization of heat transfer areas and carry-over separator devices. This paper describes the properties of the MED evaporators, the results regarding purity of distillate and minimal energy requirements as achieved by MED commercial plants utilizing low temperature heat sources and by mechanical multi-effect vapor compression (incorporating the same evaporators) using unique water vapor compressors and utilizing mechanical energy. Several examples of recently commissioned plants of the two types (MED and MVC ME) operating to supply distillate at purities of 5 to 1 ppm will be presented including a detail of specific energy consumption and operational costs breakdown when using sea water for high purity distillation.