An indirect freeze concentration system operating in accordance with a reversibleheat
pump cycle includes a first tube-tube heat exchanger and a second tube-tube heat
exchanger . Heat exchange between a selectively supplied feed stream and a low
pressure low temperature refrigerant enables a solvent from the feed stream to freeze
within the first tube-tube heat exchanger while vaporizing the low pressure low temperature
refrigerant . A first compressor receives and compresses the low pressure vapor
refrigerant to an intermediate pressure . Heat exchange between a pre-formed frozen
solvent and the intermediate pressure refrigerant within a second tube-tube heat exchanger melts the frozen solvent and partially condensing the intermediate pressure refrigerant.
A second compressor receives and compresses the vapours of the partially condensed
intermediate pressure refrigerant to a high pressure refrigerant . Heat of the high pressure
refrigerant is rejected to ambient temperature to obtain a condensed refrigerant which is re-circulated to the first tube-tube heat exchanger
Indian patent application no. 1915/MUM/2010
Inventors: M V Rane, Yogesh S. Padiya
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