JPS6032097Y2 - Oxygen flow path protection device in converter trunnion shaft - Google Patents

Description

[Detailed description of the invention] This invention is an oxygen flow path protection device in the trunnion shaft of a converter, in which the trunnion shaft is provided with a passage that supplies oxygen to the oxygen passages provided at the bottom of the converter or on the side wall of the lower bottom of the furnace. It is related to.

It is well known that the lining refractories of converters are worn out as the number of operations increases, but especially at the end of the lining life, the thickness of the bricks becomes extremely thin. The temperature becomes high, and the iron skin of the abnormally worn part of the brick reaches 700 to 800 degrees Celsius or higher, and in extreme cases, the iron skin may melt and an accident may occur where molten steel flows out of the furnace.

In particular, the inner skin of the shaft attachment part of the trunnion ring has a part that is always in contact with slag (which is highly corrosive to bricks), regardless of the tilt angle of the furnace body.
Since this area is difficult to repair by spraying refractories, there is a high possibility that a molten steel spillage accident will occur.

On the other hand, if an oxygen flow path is provided in the trunnion shaft and the inner skin overheats or melts, there is a possibility of an explosive combustion accident due to oxygen if the oxygen contact part becomes overheated or melts. had.

The present invention aims to eliminate the above-mentioned drawbacks, and its gist is that the trunnion shaft that supports the converter has a
providing a first oxygen line parallel to the axis;
A second oxygen pipe line is provided perpendicularly to the pipe line at the attachment part of the trunnion shaft, and an air opening to the furnace body side is provided at the part of the attachment part of the trunnion shaft where the first and second oxygen pipe lines intersect perpendicularly. This is an oxygen flow path protection device in a trunnion shaft of a converter, characterized in that a chamber is provided and a refractory is buried on the furnace body side of the chamber.

Hereinafter, the present invention will be explained in detail based on examples.

A first oxygen pipe 3 parallel to the trunnion shaft 2 is provided in the trunnion shaft 2 that supports the bottom-blowing or top-blowing converter 1 and drives the converter 1 in rotation, and a first oxygen pipe 3 is provided perpendicularly to the first oxygen pipe 3. A second oxygen line 4 is provided, the first line 3 and the second line 4 each being attached to a manifold 5 within the trunnion shaft 2.

A refractory material 7 is buried in a cavity on the furnace body side of the manifold 5, and is covered with a lid body 8.

In addition, FIG. 2 shows another embodiment of the present invention,
This is an example in which a shielding plate 9 is provided in order to further reduce the influence of radiant heat from the converter furnace body 1.

In the figure, 10 is a rotary joint.

As mentioned above, the present invention provides a manifold 5 at the connection part between the first pipe line 3 and the second pipe line 4 provided perpendicularly on the trunnion shaft 2 of the converter, and inscribes the bend member 6 in this part. Since the refractory 7 is buried in the furnace body side of the vent member 6, even if a hole opens in the steel shell and molten steel enters the trunnion shaft 2, the refractory 7 on the heating side will block the heating from the converter and eliminate oxygen in the oxygen pipe. There is no need for direct contact with oxygen, and there is no risk of ignition and combustion due to heating of the oxygen, which prevents dangers that could cause a catastrophe and allows converter work to be carried out safely.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention; FIG. 1 is a cross-sectional explanatory view of the present invention, and FIG. 2 is a cross-sectional view of another embodiment of the present invention. 1 is a converter, 2 is a trunnion shaft, 3 is a first oxygen pipe, 4
5 is a second oxygen pipe line, 5 is a manifold, 6 is a bend member, 7 is a refractory, 8 is a lid, 9 is a shielding plate, and 10 is a rotary joint.

Claims (1)

[Scope of utility model registration request] A first oxygen pipe line parallel to the trunnion shaft supporting the converter is provided in the trunnion shaft, and a second oxygen pipe line is provided perpendicularly to the first pipe line at the attachment part of the trunnion shaft, and further A chamber opening toward the furnace body is provided at a portion of the mounting portion of the trunnion shaft where the first and second oxygen pipes intersect at right angles, and a refractory is buried in the furnace body side portion of the cavity. Oxygen flow path protection device in the furnace trunnion shaft.