Importance

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Abstract

The present invention provides a geothermal power generation system that can control deposition of silica scale. A geothermal power generation system includes: a production well; a steam separator that separates a geothermal fluid which is obtained from the production well, into steam and hot water; a turbine that is rotated by the steam separated by the steam separator; a reinjection well to which the geothermal fluid that has passed through the steam separator and/or the turbine is returned; a pH measurement system that extracts a part of the hot water separated by the steam separator and measures a pH of the hot water, and a first thermometer that measures a temperature of the hot water; an injection device that injects an alkaline chemical into the geothermal fluid; a second thermometer that measures a temperature of the geothermal fluid at a pH estimation point which is selected from the group consisting of an injection portion for the alkaline chemical, an outlet of the steam separator, and an inlet of the reinjection well; and a control device that controls the injection of the alkaline chemical by the injection device, on the basis of measurement results of the pH measurement system, the first thermometer, and the second thermometer.

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First Claim