Nippon Steel Corporation

Kawasaki Jukogyo Kabushiki Kaisha

Toyo-o Murata

Mazumi Nishikawa

Toru Yoshida

Yukinori Shigeyama

Hiroshi Narita

Noriaki Suga

Masao Kimoto

Nobuyuki Fujikura

A device for sealing the skirt of a converter waste gas recovery system is disclosed, which comprises a primary sealing apparatus adapted to enclose the converter mouth and mounted along the skirt along a lower edge thereof, a secondary sealing apparatus adapted to encircle about the primary sealing apparatus, and primary hydraulic cylinder for vertically moving the skirt together with the primary sealing apparatus, and a secondary hydraulic cylinder for vertically moving the secondary sealing apparatus independently of the primary sealing apparatus. The primary sealing apparatus is intended to provide sealing for the gap between the skirt and the converter mouth. The secondary sealing apparatus serves to insure sealing when the primary sealing apparatus has failed to provide proper sealing because of adhered slag along the rim of the mouth from prolonged operations. Either or both of the sealing apparatuses include a sealing jacket adapted to enclose the skirt and filled with water and a sealing plate built to extend along the sealing apparatus and mounted to have its lower portion submerged into the water in the sealing jacket for sealing and cooling the respective sealing apparatus in the heat generated by the converter.

Apparatus for sealing the skirt of a converter waste gas recovery system

An apparatus for sealing the skirt of a converter waste gas recovery system is disclosed, which includes an annular flange that is mounted about the outside surface of the converter adjacent to its mouth at a point clear outside the reach of the molten slag and metal that might spill over the rim of the converter mouth during the process of blowing. An annular sealing band is provided at the lower peripheral portion of the skirt, which runs surrounding the mouth. The annular sealing band is divided into multiple arcuate segments of a whole bandage, each pivotally disposed on a horizontal pin and connected to a separate hydraulic cylinder through its axially movable piston rod. It is so designed that the segments of the annular sealing band are individually yet simultaneously swung about their respective pins by their hydraulic cylinders into abutting contact with the external periphery of the flange providing a tight leakproof seal. In the contacted surfaces of the annular sealing band and the flange, sealing is most unlikely impaired by clumps of solidified slag and metal spilled in molten state from the converter mouth as in the skirts of conventional waste gas recovery systems.

The exhaust-gas treatment system of a sealed-type steel converter is operated at the time of an emergency during blowing by a method which comprises stopping the blowing of oxygen, opening an emergency air suction device connected to the hood while, at the same time, maintaining a converter controlling damper at its degree of opening at the time of stopping of the blowing, disconnecting the skirt of the hood from the converter mouth, and opening the damper to a specific degree of opening. By this simple method, sudden and great pressure drops within the converter are prevented, whereby CO gas of high purity can be efficiently recovered without the occurrence of damage to parts of the system due to abrupt pressure difference and explosion of CO gas.

Method of operation of exhaust-gas treatment system of sealed-type

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Kitakyushu, Japan

Toyo-o Murata