Geothermal power generation system and silica scale deposition control method

Abstract

A geothermal power generation system to control deposition of silica scale may include a steam separator that separates a geothermal fluid from a production well, into steam and hot water, such that the geothermal fluid passing through the steam separator and/or a turbine rotated by the steam is returned to a reinjection well. A pH measurement system measures a pH of the hot water. A first thermometer measures a temperature of the hot water. An injection device injects an alkaline chemical into the geothermal fluid. A second thermometer measures a temperature of the geothermal fluid at a pH estimation point selected from an injection portion for the alkaline chemical, an outlet of the steam separator, and an inlet of the reinjection well. A control device controls injection of the alkaline chemical based on measurement results of the pH measurement system, the first thermometer, and the second thermometer.