JPS6033163B2 - Converter bottom blowing tuyere hot exchange method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottom blowing tuyere heat exchange method for a converter.

In a converter, local melting of the bottom refractory around the bottom blowing gas injection part is significant, which shortens the life of the furnace.

Among the converter bottom blowing methods, in the Q-BOP method, when the area around the tuyere is damaged, the bottom part in the area that includes all the tuyeres is replaced with a replacement bottom part prepared separately. The replacement method is used to extend the life of the converter, but this method requires high equipment costs, a large amount of bricks to be disposed of, and the bottom of the furnace. Due to reasons such as the long downtime of the converter required for replacement,
The drawback is that steel manufacturing costs will rise.

In view of the current situation, the present inventor has developed a new converter bottom blowing tuyere which enables hot exchange of individual sleeve bricks without using the above-mentioned hearth exchange method. It is proposed in the idea.

In other words, the gist is: the wings of the hearth iron skin □ Fixed hardware fixed to the inner perimeter green of the entrance part, the hollow wings engaged with the fixed hardware and fixedly mounted □ Permanent bricks, the permanent bricks of the tuyere A truncated circle corresponding to the cone-shaped inner cavity formed by the hollow wing bricks engaged with the notches formed on the upper surface and the hollow inner cavity of the tuyere permanent brick. A sleeve brick having a weight shape and inserted into the inner cavity, a multiple tube for blowing gas inserted into the center hole of the sleeve brick, and a frame metal fitting that supports the sleeve brick and the multiple tube for gas blowing. This is the bottom blowing tuyere of the furnace. An object of the present invention is to provide a method for replacing sleeve bricks at the bottom blowing tuyere of such a converter.

Before explaining the present invention, the bottom blowing tuyere of the novel converter mentioned above will be explained first.

In Fig. 1, 1 is the bottom shell of the converter, 2 is the closing part for the blade □ which is closed on the steel shell 1, and 3 is a fixed metal fitting fixed to the inner periphery of the opening □ for the blade □. They are arranged as shown in Figure 2 A to C.

Reference numeral 4 denotes a wing permanent brick, which has a bore 4a at the center, a cutout groove 4b on the inner periphery of the upper surface, and a cutout engagement part 4c that engages with the fixed hardware 3 on the outer periphery of the lower surface.

5 is a wing □ brick, which has an inner cavity 5a in the center, and the lower end thereof is engaged with the cutout groove 4b of the wing □ permanent brick 4 and is shrunk.

The inner cavity 4a of the permanent tuyere brick 4 and the inner cavity 5a of the tuyere brick 5 are integrally formed to form an inner cavity corresponding to the shape of a vice principal's weight of a three-leaf brick 6, which will be described later. The sleeve brick 6 includes sleeve brick units 6a, 6a2...6.
a6, and on the top of each unit there are tabs 6c, 6c, .
6c2...6c5, the lower surface of each unit is provided with an engaging recess corresponding to each tab.

In addition, the sleeve brick unit has a lumen 60 in the center and a lumen 60 in the center.
6Q...6b6 are formed, and together constitute an internal cavity portion into which the double pipe 7 for blowing gas is inserted. The lowermost part of the sleeve brick 6 is supported by a holding frame 8 installed in the closed part 2 of the iron shell 1.

The double pipe 7 for gas blowing consists of an inner pipe 7a and an outer pipe 7b,
Conduits 7a, 7a2 to respective gas supply sources are provided.

This gas blowing double pipe 7 is firmly held at its base by a double pipe holding frame metal fitting 9, and the frame metal fitting 9 is attached and fixed to a sleeve brick holding frame metal fitting 8. The mounting manner is such that the sleeve 9a of the frame metal fitting 9 is inserted into the center hole of the frame metal fitting 8 as shown in the drawing. In the figure, 8a is an annular projection at the center of the frame metal fitting 8 that engages with an annular groove 6e at the center of the bottom of the brick unit 6a of the sleeve brick 6. Further, 10 and 11 are bolts for fixing the frame metal fitting 9 to the frame metal fitting 8, and 12 is a bolt. An embodiment in which a converter is newly equipped with the tuyeres of the present invention will be described. First, a permanent brick 4 is fixed onto the tuyere entrance part 2 of the converter bottom shell 1.

At this time, the green part of the bottom outer periphery of the brick 4 is provided with a cutout engagement part 4c that engages with the fixed hardware 3 fixed to the periphery of the wing □ closing part 2, so that the brick 4 can be attached to the wing □ Sekiguchi part. 2 can be aligned correctly. Next, the tuyere brick 5 is placed on the tuyere permanent brick 4. At this time, the bottom of the tuyere 5 engages with the notch groove 4b formed on the inner periphery of the upper surface of the tuyere permanent brick 4. It can be correctly aligned with the permanent brick 4. In this way, the inner cavities 4a and 5a of the wing □ permanent brick 4 and the wing 〇 brick 5 are integrated to form an inner cavity corresponding to the warhead cone shape of the sleeve brick 6. Next, permanent bricks 13 are lined on the iron skin 1 surrounding the tuyere permanent bricks 4, and wear bricks 14 are laminated surrounding the tuyere square bricks 5. Needless to say, the joints between these bricks are filled with a monolithic refractory material such as mortar. Further, the wing brick 5 can also be made into an integrated tuyere brick 5 by stacking individual divided unit bricks divided in the horizontal direction. By doing so, it is also possible to replace only the melted unit bricks with new unit bricks during hot repair. Tuyere permanent brick 4 thus constructed
The sleeve brick 6 into which the double gas blowing pipe 7 is inserted is loaded into the inner cavity integrally formed by the inner cavity of the wing brick 5 and the inner cavity of the wing brick 5. is carried out as follows.

The sleeve brick holding frame 8, which has a shape that can be loaded into the wing opening 2 of the iron shell 1, preferably has an annular protrusion 8a at its center.

A double pipe holding frame 9 into which the gas blowing double pipe 7 is inserted in advance is attached to this frame hardware 8 with fixing bolts 10 and 11. At this time, the sleeve 9a of the frame hardware 9 It is inserted into the hole. At this time, since the double pipe 7 is protruding in a bare state, the sleeve brick 6 is attached to the double pipe 7.
The brick units 6a, 6a2, . . . , 6a6 are successively inserted and stacked. At that time, the lowest Rengunit 6
The annular groove 6e at the bottom of the frame fitting 8 is connected to the annular protrusion 8a
It also engages with the tabs 6C, 6C2... of each unit.
6c5 can engage the engagement recess of the upper brick unit, so it can be arranged and laminated with good alignment with respect to the double gas blowing pipe 7. These sleeve brick units and the frame hardware 9 are bonded using a heat-resistant adhesive. The sleeve brick 6 thus assembled integrally with the double pipe 7 for blowing gas has the shape of a vice principal cone as shown in the figure, while the inner cavity 4a of the wing □ permanent brick 4 and the wing □ brick 5 are connected as described above. It has a size to be integrated with an inner ridge formed by integrally passing through the inner cavity 5a. However, since the inner cavity of the lever is formed in correct alignment with the wings □ opening □ of the iron shell 1, this inner cavity serves as a guide to properly guide the assembly of the sleeve brick 6. It can be installed extremely easily and accurately using the insertion means of . Finally, the joints between this assembly of sleeve bricks 6, the iron skin 1, the tuyere permanent bricks 4, and the outer wing sleeve bricks 5 are sealed with sealing packing or monolithic refractories. In addition, the frame hardware 9 is attached to the iron skin 1 by the cotter 12.
Fix it to. Next, a hot exchange method will be described when replacing sleep bricks due to port losses due to steelmaking work.

First, the support frame hardware 9 of the double pipe 7 is uncoupled from the steel shell 1 by releasing the cotter 12, and after the joints related to the gas piping are removed, a pulling means grasps the support frame hardware 9;
For example, as shown in FIG. 4, the gas blowing pipe 7 is pulled out of the furnace together with the frame hardware 8 and 9 from a moving vehicle having a frame hardware gripping arm 21.

Next, the sleeve brick 6 is removed by a suitable removal means, for example, a traveling vehicle 22 equipped with a rod 23 as shown in the plan view of FIG. As a result of this removal, the cone-shaped inner cavity formed integrally by the inner cavity 4a of the tuyere permanent brick 4 and the inner cavity 5a of the tuyere brick 5, as described above, is replaced. new sleeve brick 6
will be prepared to accept. That is, in a hot state, by first pulling out the gas blowing pipe from the remaining sleeve brick inserted into the inner cavity, and then removing the remaining sleeve brick, the penetration part from the inside of the furnace to the outside of the furnace bottom is removed. Only the gas blowing pipe insertion/extraction hole in the sleeve brick minimizes the radiant heat radiation from the inside of the furnace to the outside of the hearth bottom, maintains a good environment for the next remaining sleeve brick removal work, and injects the gas extracted earlier. The depth of the remaining sleeve brick is determined from the length of the pipe, and based on this, the demolition and removal speed, pressing force of the demolition and removal tool, etc. are adjusted to prevent excessive pressing force or demolition and removal speed from reaching the surroundings of the sleeve brick. The purpose is to smoothly and quickly complete the dismantling and removal work of the remaining sleeve bricks without damaging the inner cavity wall surfaces of the tuyere permanent bricks surrounding the remaining sleeve bricks and the inner cavity wall surfaces of the wing bricks. .

In addition, the length of the new sleeve brick with a built-in gas blowing pipe to be inserted and the length of the built-in gas blowing pipe can be quickly determined based on the depth of the remaining sleeve brick estimated from the length of the gas blowing pipe that was previously removed. A newly used sleeve brick assembly with a built-in gas blowing pipe is selected from among many types of sleeve brick assemblies prepared in advance as will be described later, and is inserted into the inner cavity. At this time, the wall surface of the inner cavity is not damaged by the above-mentioned dismantling method, so the work can be carried out smoothly and quickly, and the time required for hot exchange during converter operation can be significantly shortened. This can significantly improve the operating efficiency of converters. The inner cavity 4a is selected based on the length of the gas blowing pipe extracted there.
The sleeve brick assembly to be inserted into 5a is previously prepared as follows. That is, as shown in FIG.
are integrated, a gas blowing pipe 7 is inserted therein, and sleeve brick units 6a, 6a2, .

At this time, the frame hardware 8 and the three-piece brick unit 6a are bonded together using a heat-resistant adhesive. The S-IJ blower assembly to be prepared should be prepared in various lengths by changing the number of tiers of three-layer units to be stacked, and the length of the gas blowing pipe extracted in this way It is possible to select a new sleeve brick assembly with a built-in gas blowing pipe having a gas blowing pipe length and an IJ brick length corresponding to the degree of erosion of the sleeve brick estimated from above. This sleeve brick assembly has the above-mentioned inner cavity 4a.
, 5a from a mobile vehicle 2 equipped with suitable insertion means, for example, a frame hardware gripping arm 21 as shown in the plan view of FIG.

Note that FIG. 7 is a side view of the traveling vehicle 20, and FIG. 8 is a side view of the traveling vehicle 22. Insertion of the sleeve brick assembly can be easily and accurately carried out because the inner cavity 4a of the permanent tuyere brick 4 and the inner cavity 5a of the tuyere brick 5 form a guide L, which, in combination with the conical shape of the sleeve brick 6, is carried out easily and accurately. It will be done.

After installing the sleeve brick assembly, the frame hardware 9 is fixed to the steel shell 1 with a cotter 12.

Also, if necessary, the wing bricks 5 and wear bricks 4 around the sleeve bricks are repaired to complete the replacement work. As described above, according to the present invention, the sleeve bricks at the bottom blowing tuyere of a converter can be replaced easily and accurately in a short time while hot, and at the same time, the amount of waste bricks is reduced as much as possible. As a result, the operational efficiency of the converter can be significantly improved, and the cost required for replacing sleeve bricks can be reduced, which is a practical effect.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a converter bottom blowing tuyere that can be hot-exchanged according to the present invention, Fig. 2 is a view along arrow A-A in Fig. 1, and Fig. 3 is a view of the blade □ at the bottom of the converter furnace. Explanatory diagram showing the wearing state, Fig. 4~
FIG. 6 is an explanatory diagram showing an embodiment of the hot exchange of the sleeve brick assembly according to the present invention, and FIGS. 7 and 8 are side views of the traveling vehicle. Tano sardine, figure 2, Takuzu, Tsutomu 3, sardine, figure 6, figure 8

Claims (1)

[Claims] 1. The internal cavity of the tuyere permanent brick fixedly installed above the tuyere opening of the converter bottom shell and the internal cavity of the tuyere brick engaged and placed on the tuyere permanent brick. When hot replacing the sleeve brick with a built-in gas blowing pipe inserted into the integrally formed internal cavity, the gas blowing pipe was first pulled out from the sleeve brick, and then the remaining sleeve brick was removed. A sleeve brick with a built-in gas blowing pipe built into the subsequent inner cavity has a gas blowing pipe length and a sleeve brick length corresponding to the degree of erosion of the sleeve brick estimated from the length of the gas blowing pipe that has been pulled out. A converter bottom blowing tuyere hot exchange method characterized by inserting a converter.