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Refractory flame-gunning apparatus
| Details |
Inventors: Matsuo, Masataka;
Assignee: Nippon Steel Corporation (Tokyo, JP)
Primary Examiner: Kashnikow; Andres
Assistant Examiner: Forman; Michael J.
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
A refractory flame-gunning apparatus has a feeder, a controller and a flame-gunning burner. The feeder has a refractory-powder feeding section, an inflammable-gas feeding section and a combustion-assisting-gas feeding section. The controller controls the supply of refractory powder, inflammable and combustion-assisting gases. The flame-gunning burner has a plurality of refractory powder and flame ejecting nozzles disposed at its tip. The flame-gunning burner has a gas mixer and a combustion-assisting-gas cutoff valve. The gas mixer has an inflammable-gas passage leading to the inflammable-gas feeding section, a combustion-assisting-gas passage leading to the combustion-assisting-gas feeding section, a gas mixing chamber communicating with the inflammable and combustion-assisting gas passages, and a mixed-gas passage the upstream side of which communicates with the gas mixing chamber and the downstream side of which communicates with the flame ejecting nozzles. The gas mixer is provided for each individual flame nozzle. The combustion-assisting-gas cutoff valve is provided in the gas mixer and is actuated by the gas pressure built up in the mixed-gas passage. When backfire occurs, the pressure in the mixed-gas passage rises to close the combustion-assisting-gas cutoff valve, whereby the backfire is put out instantaneously. |
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DETAILED DESCRIPTION The object of this invention is to provide a refractory flame-gunning apparatus that is capable of stopping a backfire instantaneously and with certainty.
A refractory flame-gunning apparatus according to this invention comprises a feeder, a controller and a flame-gunning burner.
The feeder comprises a refractory powder feeding section, an inflammable gas feeding section and a combustion-assisting gas feeding section.
The controller controls the supply of a refractory powder, an inflammable gas and a combustion-assisting gas.
The flame-gunning burner has a plurality of refractory-powder and flame ejecting nozzles disposed at the tip thereof.
The flame-gunning burner is equipped with a gas mixer and a combustion-assisting gas cutoff valve.
The gas mixer comprises an inflammable gas passage communicating with said inflammable gas feeding section, a combustion-assisting gas passage communicating with said combustion-assisting gas feeding section, a gas mixing chamber communicating with both the inflammable and combustion-assisting gas passages, and a mixed-gas passage the upstream side of which communicates with the gas mixing chamber and the downstream side of which communicates with said flame nozzles.
The gas mixer is provided for each individual flame nozzle.
The combustion-assisting gas cutoff valve is provided in the gas mixer and is actuated by the pressure of the gas passing through the mixed-gas passage.
When a backfire occurs in the apparatus just described, the pressure in the mixed-gas passage rises to close the combustion-assisting gas cutoff valve and thereby put out the fire.
The controller of the apparatus according to this invention is equipped with an inflammable gas passage communicating with the inflammable gas feeding section, a combustion-assisting gas passage communicating with the combustion-assisting gas feeding section, a first inert gas passage connecting the inflammable gas passage to an inert-gas feeding section, and a second inert gas passage connecting the combustion-assisting gas passage to the inert-gas feeding section
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