Power generation and potable water recovery from salinous water

Distillation: processes – separatory – Water purification only – Under pressure or vacuum

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203DIG20, 203DIG1, 203 80, 203 91, 60641, 60648, B01D 306

Patent

active

040466396

ABSTRACT:
A process for simultaneously generating power and recovering potable water from a source of salinous water -- e.g. sea water. Salinous water, from a locus which is proximate to the surface thereof and at a relatively high temperature -- e.g. about 85.degree. F. -- is exposed to radiant solar energy to increase significantly the temperature thereof -- e.g. to a level of at least about 135.degree. F. The heated water is introduced into a plurality of flash separation zones, each succeeding one of which is maintained at a lower subatmospheric pressure than the preceding zone, to provide substantially non-salinous vapor phases. The salinous liquid phase is introduced in series through the plurality of flash zones. The vapor phases are passed through separate, individual turbines, or into different stages of a multiple-stage turbine, from the resulting motion of which power is generated. Vapors exiting from the turbines are condensed via indirect heat-exchange with a second salinous water portion, obtained from a second depth substantially below the surface, and at a comparatively lower temperature -- e.g. about 70.degree. F. -- to recover the liquid potable water. The salinous liquid phase emanating from the last flash zone is used to vaporize, via indirect heat-exchange, a hydrocarbon; this passes through a turbine, and additional power is generated. The exiting hydrocarbons are condensed, via indirect heat-exchange with another portion of said second salinous water, and recirculated to the indirect heat-exchanger.
The second salinous water portion, following the condensation of said exit turbine vapors, and the third salinous liquid phase, following vaporization of the hydrocarbon, are returned to the original source of the salinous water. Preferably, the water returned to the salinous water source has a temperature not more than 15.degree. F. greater than the temperature of the colder, second salinous water portion.

REFERENCES:
patent: 1230417 (1917-06-01), Lillie
patent: 3468762 (1969-09-01), Klitzsch
patent: 3489652 (1970-01-01), Williamson
patent: 3531939 (1970-10-01), James
patent: 3928145 (1975-12-01), Othmer
patent: 4009082 (1977-02-01), Smith

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