JPS6030719Y2 - Converter hearth brick repair equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a repair device for repairing the bottom bricks of a converter, particularly a bottom-blown or top-bottom-blown converter.

Recently, in addition to the top-blowing lance, a converter with bottom-blowing holes at the bottom of the furnace has been developed and is proving effective.

In this converter, oxygen is blown into the molten steel from the top blowing lance at the furnace mouth as well as from the bottom blowing tuyere, so the temperature near the bottom blowing tuyere becomes extremely high and the bricks around the tuyere are severely worn out.

To repair such localized brick wear, a monolithic refractory is sprayed from the furnace mouth.

However, such repair methods have little effect, and the life of the converter is extremely short, and its operation is halted.

However, the state of wear and tear on the walls of the converter furnace, which has been shut down, is such that most of the walls other than the bottom of the furnace are not worn out and are in good enough condition to withstand use. This is the current situation.

In order to fully utilize the furnace wall bricks other than those at the bottom of the furnace, it is necessary to replace the bricks only at the bottom of the furnace.

However, in order to reload the hearth bricks, the furnace is tilted, scaffolding is erected at the hearth, and workers have to enter the furnace to work, but the heat from smelting remains inside the furnace, or there is a risk of falling debris on the furnace walls. Due to the poor and dangerous working environment, it was impossible for people to enter the furnace for repair work.

Therefore, it was necessary to leave it for several tens of hours until it was completely cooled and then repair it.

This idea is a repair device developed with the aim of making it possible to repair the bottom of a converter while it is still in a high temperature state. This is characterized by a cylindrical scaffolding tube that can be expanded with its tip opening facing the bottom of the converter furnace and fixed therein.

The following will be explained based on the drawings.

FIGS. 1 and 2 are diagrams showing an embodiment of this invention.

Reference numeral 1 is a bottom-blown converter, in which the entire surface of the furnace wall is lined with refractory bricks 2 on the inside of the steel shell.

3 is the furnace mouth, and 4 is the bottom blown surface.

A converter is usually used for refining in an upright position,
The figure shows a converter tilted horizontally.

Reference numeral 5 denotes a scaffolding pipe of this device, which is made of steel plate and has a cylindrical shape, for example, and whose inner surface is lined with a refractory material 6.

The cylindrical steel plate is usually a steel plate with a thickness of about 9 to 16 rIrIn, and it is used to prevent deposits from falling from the top of the furnace during repair work, and to carry the repair equipment into the scaffolding pipe, so it can withstand the weight of these materials. A strong steel plate should be used.

The lining refractory is suitable for blocking high-temperature air from the converter body during repair work, and is preferably a monolithic refractory or a fibrous refractory.

Further, the opening at the tip of the scaffolding pipe 5 faces at an appropriate interval for repairing the hearth bricks, and is fixed to the converter body by a fixing column 7.

Furthermore, the scaffold tube 5 has a tip opening that can be twisted.

That is, the distal end portion 8 of the scaffold tube is a divided tube divided into four parts, and each divided tube can be twisted around the axis 9.

When repairing the upper bricks at the bottom of the converter, push up the split pipe on the ceiling and fix it (indicated by the dotted line in the figure).

When repairing the lower part of the furnace bottom, the split pipe on the floor is twisted downward, excluding the fixing column 7 (as shown by the dotted line in the figure).

Also, the left and right split pipes can be twisted in the same way.

In other words, each split pipe can be twisted vertically, horizontally, and horizontally, and these twisting ports make it possible to repair the entire bottom of the converter.

When the repair work is completed, the fixing column 7 is removed from the repair device, and it is taken out from the converter mouth by a crane or the like, and the converter starts its normal operation.

As mentioned above, this devised repair device has made it possible to reload and repair converter hearth bricks, which was previously impossible, safely and in a short period of time (repairs can now be performed in high-temperature conditions). During work, objects falling from above are completely prevented, and hot air from the furnace body is also blocked by the refractory lined in the scaffolding pipe.

Furthermore, if necessary, installing a fan or the like inside the scaffolding pipe allows outside air to be easily taken in, thereby significantly improving the working environment.

Furthermore, it has many effects, such as the ability to carry in and carry out repair equipment or to carry out dismantled furnace wall bricks efficiently using a transport vehicle or the like.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are diagrams showing an embodiment of this invention. 1...Converter, 2...Refractory brick, 3.
... Furnace mouth, 4 ... Bottom blowing, 5 ...
...Scaffolding pipe, 6...Refractory, 7...
Fixed pillar, buttock...divided pipe, 9...shaft.

Claims (1)

[Scope of utility model registration request] A device for repairing bottom bricks of a converter, characterized in that a cylindrical scaffolding pipe lined with refractory material and having an expandable tip is fixed so as to face the bottom of the converter.