Spraygun for splashing slags to protect converter and its splashing method

Abstract

A spray gun for splashing slags to protect converter after tapping off is composed of spray tube and nozzle. Said spray tube consists of external sleeve tube, middle-layer water tube and internal nitrogen gas tube. Said nozzle is an integral structure composed of external wall, cooling water wall, gas chamber and 6 spray holes. After tapping off, the slags material including light-burnt magnisium balls and light-burnt dolomite is added by 1-2 Kg / T (steel), and nitrogen gas is sprayed out at speed higher than 530 m / s for splashing the slags.

Description

technical field [0001] The invention belongs to the field of converter steelmaking. It is mainly suitable for slag splashing furnace protection of large converters. Background technique [0002] During converter steelmaking, due to the erosion and impact of molten steel and slag, the lining of the furnace is severely eroded. Therefore, after tapping, the lining of the furnace often needs to be repaired, usually with gunning materials or tar and dolomite bricks. As a raw material for repairing furnace lining. The repair of the converter lining not only consumes a large amount of refractory materials, reduces the productivity of the converter, but also consumes heavy physical labor. [0003] For this reason, in recent years, the converter slag splashing protection method has been developed internationally. The method is to leave part of the final slag after the converter is tapped, and add an appropriate amount of slag adjusting agent to make the slag have a suitable viscos...

AI Technical Summary

Problems solved by technology

[0005] (1) On a large-scale converter, when the steelmaking oxygen lance is used to spray high-pressure nitrogen to protect the furnace by slag splashing, 20-30mm thick slag is often bonded to the gun barrel at the end of the oxygen lance and above, and thick The slag contains some iron beads. During the next furnace of steelmaking, oxygen enters the gap between the thick slag and the lance body, and the iron beads in the thick slag react with oxygen to burn. The local high temperature can melt the oxygen lance tube wall and cause water leakage. Replacing the barrel and nozzle will not only affect production, but also be extremely unsafe

[0006] (2) Due to the limitation of the nozzle structure of the steelmaking oxygen lance, the jet flow properties produced by the injected nitrogen cannot meet the requirements of slag splashing to protect the furnace. In addition, the amount of nitrogen consumed is also large and the cost is high

[0007] (3) The service life of the steelmaking oxygen lance is short, generally no more than 20 furnaces

The central nozzle hole impacts the slag vertically, and the effect of splashing slag on the furnace wall is poor. There are only 4 nozzle holes for effectively splashing slag on the furnace wall, which affects the uniformity of slag hanging on the furnace wall

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