Power plants – Utilizing natural heat – Geothermal
Patent
1979-06-21
1981-06-16
Schwadron, Martin P.
Power plants
Utilizing natural heat
Geothermal
60649, 60673, 60641F, 16510413, 165111, 16510421, 16510425, F03G 704
Patent
active
042729610
ABSTRACT:
A process and system for recovery of energy from geothermal brines or other hot aqueous solutions of a non-volatile solute, by direct contact heat transfer using staged evaporator-condenser units operating with a low boiling water-immiscible liquid hydrocarbon. Each stage comprises a closed vessel divided into two compartments, an evaporator and a condenser, by a bubble cap tray similar in construction to those used in distillation. Hot geothermal brine or other hot aqueous liuqid is introduced into the liquid hydrocarbon contained in the lower compartment of each stage, causing boiling of the hydrocarbon at a temperature difference of 2.degree.-4.degree. F. Hydrocarbon vapors pass from the evaporator compartment through the bubble caps to the upper condenser compartment where they are condensed in contact with a cooler water stream, and the condensed hydrocarbon is returned to the lower compartment. The heated water stream under substantial pressure is fed to an expander or turbine to produce work, and the expander discharge, after cooling and condensation of any steam therein, is reintroduced into the evaporator compartments of the staged units. Such recycled water, together with make-up water is introduced as feed into the condenser compartment of the last stage and passes into the respective condenser compartments of each of the preceding stages, and is further heated in each stage, and the hot brine, or the like, introduced into the evaporator compartment of the first stage is passed through the evaporator compartments of each successive stage and is further cooled in each successive stage, and is finally passed to waste.
REFERENCES:
patent: 2749094 (1956-06-01), Lewis et al.
patent: 4043386 (1977-08-01), Franz et al.
patent: 4084379 (1978-04-01), Schwartzman
patent: 4152898 (1979-05-01), Awerbuch
patent: 4167099 (1979-09-01), Wahl et al.
Geldin Max
Husar Stephen F.
Lane William G.
Occidental Research Corporation
Patrick William N.
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