| 摘要 |
The invention is directed to a gas tight lance closing device at a cooling chimney hood for steel converters. An opening is provided in the cooling chimney for a jetting lance, which latter can be raised and lowered. The diameter of the opening is dimensioned in such a way that an annular gap remains between the inner edge of the opening and the outer circumference of the jetting lance. In order to close the chimney opening toward the lance so as to be gas tight and to enable operation at an internal overpressure of more than 0.1 bar and against a correspondingly large negative pressure without letting gas escape or letting in air, it is preferred that a base plate be securely installed at the chimney opening, that an identically shaped cover plate which can press against the base plate be fastened at the lance so as to be movable and sealed relative to the lance body by stuffing box packing, and that the cover plate have sealing rings on its underside and can be placed on the base plate and lifted from the latter by a driving device arranged at the jetting lance.
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