PURPOSE: To improve reliability and simplify the handling of operation by removing a circulating water pump.
CONSTITUTION: A branch 16 is connected to a delivery pipeline 4 and the upper side of the branch 16 is connected to a circulating water tank 6 through a gas pipeline 17. A water supplying nozzle 9 and an outflow pipeline 14 are connected to the lower part of the circulating water tank 6 while a circulating water cooler 11 is connected to the downstream side of the outflow pipeline 14. Further, the downstream side of the circulating water cooler 11 is connected to a water packing nozzle 3 by a communicating pipeline 15 while a balance pipe 18 is interposed between the downstream side of the branch 16 and the outflow pipeline 14 and an outlet nozzle 7 is provided above the circulating water tank 6. According to this constitution, the circulating water pump may be removed, therefore, the controlling system of the pump may be simplified, the reliability may be improved and the operation of the pump may be facilitated.
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