Distillation: processes – separatory – Water purification only – Under pressure or vacuum
Patent
1977-09-22
1980-07-22
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Water purification only
Under pressure or vacuum
203 1, 203 25, 203 27, 203 40, 203DIG8, 203DIG16, 159 17R, 202174, C02B 104
Patent
active
042138302
ABSTRACT:
A method is provided for the transfer of heat from a source of thermal energy to at least one thermal user or heat consuming apparatus wherein waste water, such as from an industrial process, is used as the heat transfer medium and wherein a portion of the waste water flow is evaporated in an indirect heat exchanger under pressure to yield a mixture of steam and heated liquid waste water. The steam is supplied to an indirect heat exchanger for supplying heat to the heat consuming apparatus and the heated waste water is subsequently vaporized in a plurality of stages by reducing the pressure on the waste water in each stage and by using the steam formed by the vaporization in each stage to supply part of the heat of vaporization for the waste water in the subsequent stage. When the heat requirement of the heat consuming apparatus is reduced, the heat exchanger supplying heat to the heat consuming apparatus may be valved out of the system or the steam flow thereto may be reduced. With an increased waste water yield from the particular process, a portion of the pressurized steam formed therefrom in the high pressure evaporator which flows to the heat exchanger for the heat consuming apparatus may be diverted to another part of the system.
REFERENCES:
patent: 2510548 (1950-06-01), Brunjes
patent: 3203875 (1965-08-01), Sturterant
patent: 3243359 (1966-03-01), Schmidt
patent: 3244530 (1966-04-01), Byer et al.
patent: 3411866 (1968-11-01), Jewell
patent: 3803002 (1974-04-01), Skraba et al.
patent: 3890207 (1975-06-01), Chapman et al.
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