| 摘要 |
PURPOSE:To prevent silica content from separating and adhering to an underground water permeating tank, and to prevent a reducing well from decreasing of capacity and from being get blocked, by reducing heated water to the underground after removing silica content to the degrees below to the saturated solubility point of silica in the reducting temperature by condensing and settling the silica in a condensing and settling tank, using an inorganic main condensing agent and an organic assistant after supersaturated soluble silica in the geothermal water is polymerized in a reservoir tank. CONSTITUTION:Supersaturated silica dissolved in heated water is turned into polymerized silica by introducing the heated water in the temperature usually higher than 80 deg.C at the time immediately after being discharged or injected as steam into a reservoir tank V-2 and by leaving it in the tank more than about an hour. Then the heated water is led from the reservoir tank into a condensing and settling tank V-3. The silica in the heated water is removed for the most part below to the saturated solubility point by condensing and settling it in the tank V-3, and by controlling the pH value of the heated water to the degrees of pH 6-9 which are the optimum degrees of the condensing agent, by adding an inorganic main condensing agent, preferably an aluminum compound, and an organic high molecular assistant on the market as a condensing agent, and by adding some other acid or alkali, if necessary, to the heated water. Then the upper clear part of heated water is discharged from the condensing and settling tank, and is reduced to the underground, passing through a reducing well W. |
