VACUUM-DEGASSING APPARATUS AND OPERATING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a vacuum-degassing apparatus and an operating method therefor in which at the treating end stage reducing the exhaust gas in a vacuum vessel, steam for driving, supplied into a booster is suitably controlled and the used quantity of the steam can be reduced by avoiding the wasteful use of steam. SOLUTION: In the vacuum-degassing apparatus setting the boosters 50A-50C for driving with the steam as a vacuum-exhaust gas device, in the vacuum-exhaust line L for performing the vacuum exhaust of the vacuum vessel 20; a pressure-gauge 110 is arranged at the gas-spouting side of the booster and also, a steam-pressure adjusting valve 80 is arranged in a steam supplying line 60 for supplying the steam for driving in the booster. Further, when pressure measured with the pressure-gauge 110 is lowered, a controlling means 120 for lowering the steam-pressure of the steam for driving, supplied into the booster by controlling the steam pressure adjusting valve 80 according to the lowering degree, is arranged. COPYRIGHT: (C)2011,JPO&INPIT