Power plants – Utilizing natural heat – Geothermal
Patent
1986-06-18
1987-05-19
Husar, Stephen F.
Power plants
Utilizing natural heat
Geothermal
606412, F03G 704
Patent
active
046657053
ABSTRACT:
Apparatus and method for minimizing silica scaling in steam flash vessels employed in a geothermal power plant energized by steam flashed from high temperature geothermal brine derived from a source such as the Salton Sea Geothermal Field or the Brawley Geothermal Field where the brine is substantially saturated with dissolved silica. The silica is preferentially precipitated upon silica seeds that are introduced into one or more flash crystallizer steam separators. The seeded brine is recirculated through each flash crystallizer a plurality of times under thermal power provided by the effects of flashing the incoming brine into an external draft tube so as to provide a sufficient residency time of the seeded brine in the flash crystallizer for the silica solution, which has become supersaturated because of the temperature reduction associated with the flashing, to be precipitated down to approximately saturation. The flashing brine stream is directed from the top of the draft tube into the flash crystallizer above the surface of the liquid brine, preferably directed downwardly at an inclind angle toward such surface, to prevent upward "geysering" of liquid brine and silica particles from such surface toward the vapor takeoff system leading to power turbines, and for increased flashing efficiency.
REFERENCES:
patent: 4304666 (1981-12-01), Van Note
patent: 4370858 (1983-02-01), Awerbuch et al.
patent: 4479351 (1984-10-01), Awerbuch et al.
patent: 4502285 (1985-03-01), Awerbuch et al.
Gabriel Albert L.
Husar Stephen F.
Magma Power Company
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