| 摘要 |
PURPOSE:To prevent valves from being stuck due to the adherence of silica scale by injecting the compressed fresh water from outside to control valves discharging the drain from coolers to a condenser. CONSTITUTION:The uncondensed gas 2 extracted from a condenser 1 is guided to the first-stage cooler 4 together with the drive steam 7, and the drain is discharged to the condenser 1 via a control valve 10. The drain of the second- stage cooler 6 is discharged to the condenser 1 via a control valve 11. The control valves 10, 11 are periodically opened or closed depending on drain levels of the coolers 4, 6. Furthermore, the fresh water 12 is invariably fed to the gap between the valve stem 17 and the main body 16 of each of the control valves 10, 11. Accordingly, the valves can be prevented from being stuck due to the adherence of silica scale. |
