Removal of carbon dioxide in geothermal power systems

Details Removal of carbon dioxide in geothermal power systems Removal of carbon dioxide in geothermal power systems

1980-01-22

1982-11-09

Ostrager, Allen M.

Power plants

Utilizing natural heat

Geothermal

606412, 60646, F03G 700

Patent

active

043578012

ABSTRACT:
A process for removing carbon dioxide in geothermal power generating processes employing a geothermal fluid such as geothermal brine containing carbon dioxide, to improve the efficiency of geothermal power generation, comprises introducing an aqueous alkaline solution, preferably an aqueous calcium hydroxide solution, into a vapor stream obtained from the brine during power generation, to remove carbon dioxide from the stream. In the case, for example, of power generation by direct contact heat exchange between geothermal brine and a working fluid such as isobutane, where the working fluid is expanded to generate power, aqueous calcium hydroxide can be introduced into a direct contact condenser into contact with the working fluid therein to remove CO.sub.2 present in the working fluid, thereby aiding in reducing loss of working fluid from the system and aiding in reducing pump power. The aqueous alkaline, e.g., calcium hydroxide, solution alternatively can be contacted with the geothermal fluid prior to flashing or prior to direct contact heat exchange with a working fluid, to remove CO.sub.2 from uncondensible gas contained in the fluid.

REFERENCES:
patent: 3951794 (1976-04-01), Swearingen
patent: 4089175 (1978-05-01), Woinsky
patent: 4123506 (1978-10-01), Spevack

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