JPH03104809A - Iron tapping hole in blast furnace - Google Patents

Abstract

PURPOSE:To prevent gas leakage in an iron tapping hole for a long term by forming the part of joint plugging part for filling up gap of the remaining bricks at inside of iron shell in the iron tapping hole in a blast furnace and layer part from the remaining bricks to exposing surface of the iron tapping hole with integrated structural shape refractory facing body. CONSTITUTION:Into the joint plugging part 36a for filling up gap between the remaining bricks 26, 32 at inner side from the iron shell 12 in the iron tapping hole 10 in the blast furnace and the layer part 36b from the remaining bricks 26, 32 to the exposing surface of iron tapping hole 10, monolithic refractory is caused to flow in the iron tapping hole 10 and formed to the integrated structural shape refractory facing body 36. Then, under condition of plugging a runner 16 with mud, the refractory facing body 36 is constructed. In such way, by constructing the iron tapping hole 10 with the integrated structural shape refractory facing body 36 without the joint, the gas leakage is prevented for a long term.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a blast furnace taphole having a refractory exterior body, and is particularly suitable for construction when repairing a damaged gap in the taphole and the surrounding bricks. This invention relates to a blast furnace taphole having an optimal refractory exterior body.

[Conventional technology] The taphole at the bottom of the blast furnace is where hot metal slag is extracted, and is the only part of the peripheral wall of the blast furnace where the iron skin is removed and the refractory bricks are directly exposed to the outside.

FIG. 3 is a longitudinal sectional view showing a blast furnace taphole having a conventional refractory exterior structure, and FIG. 4 is a front view showing the arrangement of bricks around the taphole.

The iron skin 12 is omitted at the tap hole lO at the bottom of the blast furnace, and a flange-shaped iron skin portion 14 is formed around the tap. The arch-shaped first brick layer 22 on the taphole surface and the second brick layer 24 inside thereof are made of alumina shaped bricks. Furthermore, the brick layer 2B corresponding to the dimensions of the countersink taphole inside the third layer is made of high alumina shaped bricks.

Further, the brick layers 28 above and below the high alumina brick layer 26 are made of regular blocks of carbon, and a stamp layer 32 made of a monolithic refractory is provided between the carbon block layer 28 and the iron skin 12.

The protruding runner l6 passes through the arch-shaped first layer 22, the high alumina brick layer 28, and penetrates into the furnace. The runner l6 is opened and closed at appropriate intervals as the iron is tapped.

Generally, the closing operation is performed by filling the runner with mud using a mud gun, and the opening operation is performed by drilling the mud in the runner using a drilling machine.

In this way, since the taphole 10 is not covered with the iron skin 12,
When the bricks 22-32 around the taphole become damaged due to use over time, such as cracks or loose joints between the bricks,
Through the gap, the furnace gas (furnace pressure 3-4 kg/eI12) blows out from the exposed brick surface of the tap hole 10, causing trouble in the tapping operation. In particular, as described above, undesirable impacts are applied to the bricks around the taphole as a result of the opening and closing of the runner, so that the bricks are susceptible to the above-mentioned damage gap.

In order to repair the above-mentioned cracks and loosened joints, in the conventional sleeve repair method, a plurality of pressure nozzles 1g with a diameter of 25-40cm are installed on the steel shell 12 around the taphole 10 (see Fig. 2). and some of them are illustrated by broken lines in FIG. 3). If gas is found to be blowing out of the furnace, identify the brick part to be repaired, press-fit monolithic refractory material (generally mortar) through the corresponding nozzle l8, and repair cracks, joints, etc. Closes the damage gap.

In addition, if the repair by press-fitting the mortar from the pressure nozzle 18 reaches the limit, the first brick layer 22, the second brick layer 24, and if necessary, the third The brick layer 26 is dismantled and the damaged bricks are replaced with new molded bricks of the same shape.

[Problem to be solved by the invention] In the above conventional method, however, due to poor consistency between the replaced new brick and the remaining brick, the wide joint between the two bricks becomes a structural weakness. Become.

For example, such joints between bricks with poor alignment are filled with mortar, but cracks are likely to occur in these joints due to the impact caused by the above-mentioned opening and closing of the taphole runner I6. For this reason, these joints are selectively attacked by the leaking gas and become leakage paths for the gas. In addition, it is difficult to avoid not only joints between bricks with poor alignment but also joints between bricks that are more likely to become passages for leakage gas than the brick bodies.

The present invention has been made in order to eliminate the drawbacks of the prior art, and it is an object of the present invention to provide a blast furnace taphole having a refractory exterior body that is highly effective in preventing gas leakage and is particularly suitable for construction at the time of repair. purpose.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a joint filling portion that fills the gap between the remaining bricks inside the shell of the blast furnace taphole, and a joint filling portion that fills the gap between the remaining bricks and the The layer portion up to the exposed surface of the taphole was made into an integral refractory exterior body in which monolithic refractory was poured and molded in the taphole.

[Function] In the brick structure according to the present invention, the area from the joint filling part that fills the gaps between the remaining bricks to the exposed surface of the taphole is occupied by the monolithic refractory after solidification that is integrally molded. , there are no brick joints on the exposed surface of the taphole or in its vicinity.

[Example] Figure 1 is a longitudinal sectional view showing an example of a blast furnace taphole having a refractory exterior body according to the present invention, and Figure 2 is a longitudinal sectional view showing an example of the blast furnace taphole having a refractory exterior body according to the present invention. -i1
FIG. 3 is a longitudinal cross-sectional view of the blast furnace taphole showing an intermediate state during construction of the refractory exterior body. In both figures, the same members as those in FIGS. 3 and 4 are given the same reference numerals.

As shown in FIG. 1, this refractory exterior body 36 includes a joint filler portion 36a that fills the gap between the remaining bricks 26 and 32 inside the shell l2 of the blast furnace taphole 10, and a joint filler portion 36a that fills the gap between the remaining bricks 26 and 32 from the remaining bricks to the taphole. It is made of an integral structure in which monolithic refractory is poured and molded in the taphole 10. The refractory sheath 36 may be constructed in repairing a damaged gap in the brick of a taphole in a conventional construction such as that shown in FIG. The refractory exterior body 3G is constructed in a state where the runner l6 is closed with mud, for example, according to the following procedure.

First, the first and second brick layers 22 and 24 of the taphole are removed (removed) by using playing force or the like to dig up the bricks. Unlike the example shown in Figure 3, if the surface of the taphole 10 is covered with irregularly shaped bricks, the range of brick removal is such that the repaired brick joints will not exist near the surface of the taphole IO. At least up to the inside of the iron shell l2. In addition, the range of floor removal will be determined by inspecting the damaged gaps in the remaining bricks and taking into account the extent of the damage. Therefore, for example, if a more severely damaged part is found when the brick is removed to the inside of the iron skin 12, the brick is dug up further.

Next, the tap hole 10 is closed with a formwork 42 equipped with a press-fit nozzle 46 (see FIG. 4), and a sealed space is formed between the formwork 42 and the remaining bricks. The press-fit formwork 42 is made of a pressure-resistant metal frame, and has a pipe-shaped portion and a frame portion that correspond to the runner 16 of the refractory exterior body 36 and the recess 38 on the exposed surface. The press-fitting formwork 42 also has a flange portion 44 that fits into the flange-like steel skin portion l4 around the tap hole. The formwork 42 is
The flange portion 44 is fixed to the tap hole 10 by attaching it to the flange-shaped steel skin portion l4 around the tap hole by welding or bolts (not shown) in a generally sealed state. The presser nozzle 4B of the formwork 42 is preferably provided with a connector portion such as a screw 48 at the end so that it can be used with any type of monolithic refractory presser device.

Next, a monolithic refractory press-in device (not shown) is connected to the pressure nozzle 46, and the monolithic refractory 34 is injected into the sealed space through the nozzle at a pressure of about 10 to about 20 kg/co+2.
Press in. As the monolithic refractory 34, for example, alumina mortar containing carbon can be used. After filling the closed space, the monolithic refractory 34 supplied to the closed space is forced into the damaged gap in the bricks by the above-mentioned high pressure. FIG. 2 is a diagram showing the state at this point, and the monolithic refractory 34 has entered the damaged gap in the bricks as indicated by the arrow in the figure.

After the monolithic refractory 34 is solidified, a refractory exterior body 36 with a runner IB is formed in the sealed space.

The joint filler portion 38a of the exterior body 3B fills each of the damaged gaps, and the layer portion 36b integrally fills the area from the remaining bricks 26, 32 to the exposed surface of the tap hole 10.

Next, when the presser form 42 is removed from the taphole 10, a blast furnace taphole having the refractory exterior body 36 according to the present invention shown in FIG. 1 is obtained.

Note that in the above embodiment, the first and second brick layers 22
, 24 (see Figure 3) to construct the refractory exterior body according to the present invention, however, the range of removal of the existing bricks is arbitrary as described above, and if necessary, the third brick layer 2 may be removed.
It is also possible to disassemble a part of 6 and construct an integral refractory exterior body according to the present invention.

[Effects of the Invention] In the blast furnace taphole having the refractory exterior body according to the present invention, the gas leak suppression period can be extended due to the integral structure refractory exterior body having no joints. Therefore, the repair cycle for this part has become longer (for example, from 0.5 to 1.0 years in the past to 1.0 to 2.0 years), and the need for opening the taphole runner, etc. has increased. Pig work can also be carried out efficiently and safely.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a blast furnace taphole having a refractory exterior according to the present invention, and FIG. 2 is a longitudinal sectional view of the blast furnace taphole showing an intermediate state during construction of the refractory exterior FIG. 3 is a vertical cross-sectional view showing a blast furnace taphole having a conventional refractory exterior structure, and FIG. 4 is a front view showing the arrangement of bricks around the taphole. lO...Tapping port portion 16...Runnet monolithic refractory 44...Flange portion l2...Steel skin l4...Flanged steel skin portion 22, 2
4, 26, 28...Brick layer 34...36...
Refractory exterior body 42... Formwork 46... Nozzle

Claims (1)

[Claims] A joint filling part that fills the gap between the remaining bricks inside the skin of the blast furnace taphole, and a layer part from the remaining bricks to the exposed surface of the taphole, are made of monolithic refractories at the taphole. A blast furnace taphole characterized by having a cast-molded integral refractory exterior body.