Leakage-proof blast furnace air supply device and mounting method thereof

Abstract

The invention relates to a leak-proof blast furnace gas supply device and a mounting method thereof, and belongs to the technical field of blast furnace ironmaking, the leak-proof blast furnace gas supply device comprises a belly pipe, a coal injection gun, a large sleeve, a medium sleeve and a small sleeve, the coal injection gun is obliquely inserted into the belly pipe on the belly pipe, the large sleeve, the medium sleeve and the small sleeve are connected in series in a jacking manner, the belly pipe penetrates through the large sleeve and the medium sleeve to be connected with the small sleeve in a jacking manner, and the top end of the belly pipe is dome-shaped; an air supply channel is arranged on the outer wall of the belly pipe, a hollow cavity is arranged in the top end of the belly pipe, the hollow cavity is connected with the air supply channel, and the hollow cavity is provided with an air outlet on the contact surface of the belly pipe and the small sleeve. According to the invention, high-temperature gas leakage is prevented from endangering the safety of field operation personnel, even explosion is prevented from occurring, and serious personal injury and huge property loss are avoided.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a leak-proof blast furnace gas feeding device and an installation method thereof. Background technique [0002] Traditional blast furnace hot air blows into the furnace from the blast furnace tuyere. The blast furnace tuyere air supply device is generally divided into direct blow pipe, coal injection gun, large sleeve, middle sleeve, and small sleeve. The large sleeve, middle sleeve, and small sleeve are connected by contact The surface is tightly connected, and the direct blowpipe and the small sleeve are also tightly connected through the contact surface. The leakage of high-temperature gas in the furnace may be caused by the following reasons, resulting in casualties and property losses: (1) Due to the long and heavy straight blowpipe, during the installation process Among them, the center of the flange surface of the straight blowing pipe coincide...

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Problems solved by technology

[0002] Traditional blast furnace hot air blows into the furnace from the blast furnace tuyere. The blast furnace tuyere air supply device is generally divided into direct blow pipe, coal injection gun, large sleeve, middle sleeve, and small sleeve. The large sleeve, middle sleeve, and small sleeve are connected by contact The surface is tightly connected, and the direct blowpipe and the small sleeve are also tightly connected through the contact surface. The leakage of high-temperature gas in the furnace may be caused by the following reasons, resulting in casualties and property losses: (1) Due to the long and heavy straight blowpipe, during the installation process Among them, the center of the flange surface of the straight blowing pipe coincides with the center of the tuyeres, butt joint installation is very difficult, improper installation will easily cause gaps between the contact surfaces; It is easy to cause gaps between the contact surfaces; (3) The working environment of the air supply device at the blast furnace tuyere is harsh, and it has to withstand high temperature and high pressure in the furnace, and the fluctuations in the furnace can also easily cause gaps between the contact surfaces; (4) In the past, spraying After the coal gun passes through the straight blowing pipe obliquely, the nozzle faces the inner wall of the small sleeve. When coal is injected, it will cause impact and erosion on the small sleeve, which will cause wear and tear of the small sleeve for a long time, and then cause the blast furnace to shut down

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