Scale suppression apparatus, geothermal power generation system using the same, and scale suppression method

摘要

Provided is a scale suppressing device which can, with a safe method, suppress generation of silica scale and calcium scale in influent water containing at least a silica component and a calcium component; also provided are a thermal power generation system using said scale suppressing device, and a scale suppressing method. This scale suppression device is provided with: a first adding device (40) which adds a chelating agent and alkaline agent to influent water flowing through a pipe (L1) to increase the pH of the influent water to greater than 7; a second adding device (50) which adds an acidic substance to the influent water to make the pH of the influent water less than 7; and a control device (11) which alternately switches between operation of the first adding device (40) and operation of the second adding device (50). The control device (11) controls switching between the first adding device (40) and the second adding device (50) on the basis of the output signals from a scale detection device (60) and a pH meter (27).