| 摘要 |
PROBLEM TO BE SOLVED: To prevent the damage of a spray nozzle protective cylinder by preventing the roll-back of a low temperature fluid sprayed into a high temperature fluid, and reducing repeated thermal stress caused by the temperature difference. SOLUTION: The center axes of a spray nozzle 5 and the spray nozzle protective cylinder 6 are decentered to narrow a clearance 14 between the spray hole 13 side and the protective cylinder 6. A medium temperature fluid 3 flowing in the clearance 14 is thereby increased in flow velocity by a nozzle effect, and the discharge capacity of roll-back spray water is remarkably improved. The roll-back of spray water can also be pushed back by providing steam jet holes 24 for jetting the medium temperature fluid 3, around the aperture of the protective cylinder. The temperature difference caused by the roll-back of the spray water is thereby reduced, and the repeated thermal stress caused by the temperature difference is reduced to prevent the damage accident of the spray nozzle and protective cylinder. COPYRIGHT: (C)2004,JPO
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