| 摘要 |
PURPOSE:To facilitate the cleaning of the principal part, to reduce cleaning frequency and to reduce the effect of the flow of a solid dissolved liquid, by providing a solvent injection port and a liquid jet port to a first chamber of a diaphragm part and providing a pressure transmission liquid injection port to a second chamber thereof. CONSTITUTION:At first, slaked lime and water are introduced into a slaked lime dissolving tank and, at the same time, water is also injected in a first chamber 17 of a diaphragm part 15 from a water injection port 21. At this time, since a piercing hole 13 and the first chamber 17 are small as compared with the dissolving tank 2, the concn. of slaked lime in the first chamber 17 does not become high. Even when a stirrer 14 is subsequently operated and a high concn. slaked lime dissolved solution 5 is ready to penetrate in the first chamber 17, the penetration of said solution is prevented or suppressed by the water stream flowing out from the first chamber 17. Therefore, slaked lime adhered to and solidified on a diaphragm 16 is reduced and, as a result, cleaning frequency may be reduced. Water is injected to the diaphragm part 16 from the water jet orifices 22, 23 of the diaphragm part 15 to allow waste water to flow out from the water injection port 21 to make it possible to easily clean slaked lime adhered to and solidified on the diaphragm 16. Further, in a liquid level measuring apparatus 26, the liquid pressure of the solid dissolved solution 5 is transmitted to a pressure sensor 14 through the oil 20 in a second chamber 18 and pressure variation is relaxed corresponding to the amount of the oil 20.
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