PURPOSE: To increase remarkably the removability of impurities in oil by providing an oil storage tank having a hot air bubbling mechanism before a dewatering vessel in the removing apparatus of impurities in oil.
CONSTITUTION: An oil storage tank 20 is connected to a bottom oil ditch 9 for collecting sealing oil b1, and separation tanks I , II, III, and IV are successively provided at the succeeding stage of the oil storage tank 20. A hot air bubbling mechanism is constituted by providing a hot air piping 21 having an opening and closing valve 22 for supplying hot air into the oil storage tank 20. An air vent 23 communicating with a piping having a fan 24 is provided at the upper part of the oil storage tank 20. In this way, the sealing oil b1 flowing into the oil storage tank 20 and accumulating is bubbled by opening the opening and closing valve 22, and supplying the hot air from the hot air piping 21. Accordingly the organic solvent components such as benzene and naphthalene are efficiently evaporated and separated, and discharged from the air vent 23.
ABE YUUJI
KAWANA KATSUJI
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