| 摘要 |
A method of separating salts from a feedwater stream includes the steps of (a) circulating a heat exchange media fluid serially between a holding tank, a condenser and an evaporator; (b) evaporating at least about 20% of the feedwater stream by thermal contact with the heat exchange media fluid in the evaporator to yield steam and a hot brine stream; (c) pressurizing the steam in a compressor operating at between about 30% and about 60% efficiency and at a pressure differential of between about 0.5 psi and about 5 psi; and (d) condensing the steam by thermal contact with the heat exchange media fluid in the condenser to yield a hot condensate stream and a heated heat exchange media fluid. In the invention, the feedwater stream is initially pre-heated by thermal contact with the hot condensate stream in a pre-heater to yield a cool condensate product stream and an initially pre-heated feedwater stream, and the feedwater stream is further pre-heated by thermal contact with the hot brine stream to yield a cool brine product stream and a further pre-heated feedwater stream.
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