Distillation: processes – separatory – Water purification only – Under pressure or vacuum
Patent
1978-02-22
1980-12-16
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Water purification only
Under pressure or vacuum
203 88, 203DIG14, 203DIG20, 60648, 122 40, 159 2R, 202172, 202202, 202205, B01D 128, C02F 106
Patent
active
042396034
ABSTRACT:
A fuel-efficient method and apparatus for the generation, actually re-generation, of ejecting steam used in a steam ejection system to evacuate process vapor from an enclosed space. In the method, all of the ejecting steam is not generated continuously in a boiler, but a predetermined quantity of steam is reused by continuous mechanical recompression, without intervening condensation, in a returning cycle while alternating between a pressure low after ejection (i.e. expansion) and a pressure high after recompression, whereas the evacuated vapor is branched off from the ejecting steam cycle after ejection and condensed. Parts of the condensate are reconverted to additional steam by heat exchange with all or part of the superheat and friction heat contained in the recompressed ejecting steam and/or by heat exchange with the exhaust and cooling system of a heat engine serving as a prime mover for the compressor. This thermally generated additional steam either may be supplied to the outside as output steam or may be employed as additional ejecting steam. The average specific thermal input into the steam, consisting partly of recompressed and partly of thermally generated steam, amounts to roughly 50% of the analogous specific thermal input in prior art.
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