| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent damage of a dry type dust collector without causing enlargement of a facility or increase of operation costs. SOLUTION: In the exhaust method, a vacuum lid 2 covered on a refining container 1, an exhaust duct 3 connected to the vacuum lid 2 and provided with the dry type dust collector 5 in the middle, and a bypass duct 36 communicating an upstream side and a downstream side of the dry type dust collector 5 are provided, the bypass duct 36 is opened at an initial stage of refining starting, exhaust is carried out by the bypass duct to replace air in the exhaust duct 31 of the upstream side of the dry type dust collector 5 with non-oxidizing gas from the refining container 1, and then, the bypass duct 36 is closed to carry out exhaust via the dry type dust collector 5. COPYRIGHT: (C)2011,JPO&INPIT
|
