| 摘要 |
PURPOSE:To obtain a high purity of treated water by the procedure in which at the start-up period, condensed water is treated with a strongly acid cation exchange resin and then treated with a mixture of a strongly acid cation exchange resin and a strongly basic anion exchange resin, whereas at normal operation, it is treated with a cation exchange resin. CONSTITUTION:Condensed water coming into the first tower 1 through the incoming water quality monitoring device Mi and the valve 5 at the start-up time of boiler is passed through he H-type strongly acid cation exchange resin layer 2 to remove impurities present, then measured its water quality by the effluent water quality monitoring device Mc, then sent to the second tower 3 through the valve 6 to treat it with the mixed layer 4 consisting of a strongly acid cation exchange resin and a strongly basic anion exchange resin, and lastly discharged from the valve 7. When the cation electric conductivity and Na concentration of the effluent of the first tower 1, measured by the water quality monitoring device Mc, comes into standard values for boiler, the valves 6 and 7 closed and the valve 8 is opened to transfer the operation of the second tower 3 to a by-passed normal operation. |
