METHOD OF RESTORING GEOTHERMAL WATER TO UNDERGROUND

摘要

PURPOSE:To prevent reduction of the amount of generated steam, by a method wherein salt water is mixed in geothermal water released in the open air and brought into a saturated state under an atmospheric pressure to coagulate and separate a supersaturated inorganic compound, prepared resulting from reduction of solubility of an inorganic compound dissolved by geothermal water, for removal. CONSTITUTION:Gas liquid two-phase geothermal fluid injected from a production well 1 flows through a piping 2 to a gas liquid separator 3, and steam separated in the separator is fed through an inner cylinder 4 to a turbine, not shown, by means of a piping 5. Meanwhile, geothermal water separated by the gap liquid separator 3 flows to a silencer 7, and is released in the open air. The steam is diffused in the open air by means of the silencer 7, meanwhile, geothermal water is fed to a coagulating settling tank 11 with the aid of a pump 9, and is mixed and agitated with salt water fed from a salt water storage tank 12 with the aid of a pump 14. The mixing and agitation causes coagulation and settling of a supersaturated inorganic compound, especially silica, in geothermal water to densely settle the inorganic compound on a bottom. Geothermal water, freed from silica, is restored through a restoration well 22 to the underground by means of a solid liquid filter 20.