JPH0247211A - Protecting wall of furnace body in blast furnace - Google Patents

Abstract

PURPOSE:To protect furnace body for long time by fixing brick holding metal fitting at upper end and cooling plates at intermediate and the other end of staves arranged for easing heat load in the furnace and supporting by inserting furnace wall bricks between them. CONSTITUTION:Iron shell 4 of the furnace body in the blast furnace is protected from the heat load in the furnace with the staves 1, which the bricks 2 are beforehand embedded. The brick holding metal fitting 6 at the upper end and the cooling plates 8, 9 at intermediate and lower end of the above stave 1 body are fixed and projected to inner side of the furnace from front face of the stave. Then, the shaped furnace wall bricks 5 are beforehand inserted and supported between the above metal fitting 6 and the cooling plates 8 and between mutually the cooling plates 8, 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a blast furnace body protection wall that protects a blast furnace wall from heat load from inside the furnace.

[Prior Art] Conventionally, as a protective wall for protecting the blast furnace shell against heat load from inside the furnace, a protective wall was used to protect the stave body from the heat load from within the furnace, as shown in, for example, JP-A-63-35708 and JP-A-63-35709. Will the brick support hardware be cast?

Or a furnace body protection wall in which a brick support metal fitting is fitted into the stave body after casting the stave, and furnace wall bricks or pre-formed monolithic refractories are sandwiched and supported by the brick support metal fitting.
Alternatively, when casting the stave, a furnace body protection wall is used, which is integrally cast with furnace wall bricks or preformed monolithic refractories.

That is, as shown in FIG. 8, a cast iron stave body l, in which a steel pipe 3 for passing cooling water is buried inside the blast furnace shell 4, is placed inside the blast furnace shell 4, and a wall concentric with the blast furnace is placed inside the blast furnace shell 4. Furnace wall bricks 5 are installed. FIG. 9 shows a stave 1 in which a brick support la supporting the furnace wall bricks 5 is integrally cast during casting of the stave body 1, and the furnace wall bricks 5 are sandwiched therein. FIG. 10 shows a type in which, after casting the stave body 1, a brick holder 1a is fitted into the stave 1, and the stave 1 with the furnace wall bricks 5 sandwiched therein is attached to the blast furnace shell 4.

Furthermore, a furnace body protection wall is employed in which the stave 1, which is made by integrally casting the brick support 1a and the furnace wall bricks 5, is attached to the blast furnace shell 4 when the stave body 1 is cast.

These furnace body protection walls absorb the heat load from inside the furnace by passing cooling water through the steel pipe 3 inserted into the stave body 1, and
The iron shell 4 is protected against the heat load of the blast furnace.

[Problem to be solved by the invention]

However, the conventional furnace protection wall described above has the following problems.

(1) In the structure in which the brick holder 1a is fitted into the stave body 1 as shown in Fig. 10, the cooling effect due to heat transfer from the stave body 1 to the brick holder la is poor, and due to the heat load from inside the furnace, The supporting function of the furnace wall bricks 5 is lost due to melting or embrittlement of the brick support 1a, and the furnace wall bricks 5 fall off.

In addition, if the surface of the stave 1 is directly exposed to the heat load in the furnace due to the fall of the furnace wall brick 5, thermal stress will concentrate on the part where the brick support 1a is fitted, which will promote cracking of the stave 1. Therefore, it is not possible to maintain a healthy furnace protection wall for a long period of time.

(2) In a structure in which the brick support 1a and the furnace wall bricks 5 are integrally cast when casting the stave 1, as shown in Fig. 9,
Casting is difficult, and defects are likely to occur in the brick receiver 1a during casting, and cracks are likely to occur due to thermal shock to the furnace wall bricks, making it difficult to obtain uniform casting. In this way, with a furnace body protection wall that has defects during casting, the furnace wall bricks 5 and the brick support 1a are likely to fall off or be damaged due to the heat load from inside the furnace. Because the cooling effect due to heat transfer from the stay 11 is small, melting and embrittlement occur early, and the bricks lose their supporting function, making it difficult to maintain a healthy furnace protection wall for a long period of time. I can't.

[Means to solve the problem]

In the present invention, in order to solve the above-mentioned problems, (1) After casting the stave body, a brick presser is installed at the upper end of the stave, and a cooling plate is installed at the midsection and the other end of the stave, each of which protrudes from the front side of the stave toward the inside of the furnace. It has a structure that can be fixed.

■ Furthermore, the part of the brick press and cooling plate that protrudes from the front of the stave toward the inside of the furnace shall have a sloped shape so that preformed furnace wall bricks can be inserted into and supported.

■ The furnace wall bricks are sloped in advance to prevent them from falling off.
Furnace wall bricks are supported by being fitted between the brick clamp fixed to the stave and the cooling plate and between the cooling plates.

■ Also, the brick presser foot and/or the cold
It is more preferable to coat the inner end of the cooling plate with ceramics.

[Function] The furnace body protection wall of the present invention has a brick retainer fixed to the upper end of the stave main body, a cooling plate fixed to the midsection and lower end,
The brick retainer and the brick support of the cooling plate are tapered, and the furnace wall bricks are inserted between the tapers.
It is possible to effectively protect the furnace body for a long period of time. In other words,
Such a furnace body protection wall protects the blast furnace shell from heat load from inside the furnace.

Furthermore, by coating the inner end of the brick press or the cooling plate with ceramics, it is possible to protect it from the heat load from inside the furnace and to prevent wear caused by the blast furnace charge.

〔Example〕

The present invention will be explained using FIGS. 1 to 7.

FIG. 1 shows a cross-sectional view of the installation of the furnace body protection wall 10 of the present invention. When the stave body I is cast, a plurality of steel pipes 3 and cast bricks 2 are integrally cast, and a brick retainer 6. Cooling plate 8 on the mid-abdomen and cooling plate 9 on the lower end
Furnace protection walls 10, each of which is fixed to the stave main body l and in which preformed furnace wall bricks 5 are sandwiched, are attached to the blast furnace shell 4 at regular intervals in the vertical and circumferential directions of the blast furnace. A filler 7 made of a monolithic refractory such as castable is filled between the furnace protection wall IO and the steel shell 4 and between each of the furnace protection walls IO.

2 is a view in the direction of arrow A in FIG. 1, and FIG. 3 is a view in the direction of arrow B in FIG. The brick retainer 6 is fixed to the stave 1 via a bolt 6a to a cast-in nut ld cast during the casting of the stave 1. Further, a ceramic material 6b is attached to the tip of the brick clamp 6 to protect it from heat load from inside the furnace and wear of the charge.

4 shows a view in the direction of arrow C in FIG. 1, and FIG. 5 shows a view in direction of arrow D in FIG. At the time of casting the stave l, the cooling plate 8 is attached by providing holes 1e and 1f that pass through the bolts 8ai3 and the water supply and drainage pipes 8b, and a recess 1g into which the bolt seats 8c and the water supply and drainage pipe seats 8d of the cooling plate 8 are fitted.

1h will be provided. The cooling plate 8 is attached to the stave main body l with bolts 8a. Further, the furnace wall bricks 5 are supported by the bolt seats 8C of the cooling plate 8, the water supply and drainage pipe seats 8d, and the stave 1.
It is supported by fitting into the recesses 1g and lh. Also, the cooling plate 8
Ceramic material 8e is attached to the tip inside the furnace.

6 shows a view in the direction of arrow E in FIG. 1, and FIG. 7 shows a view in direction of arrow F in FIG. It is fixed to the lower end of the stave 1 via a bolt 9a to a nut Id cast during the casting of the stave 1.

A ceramic material 9b is attached to the tip of the cooling plate 9 by fitting, brazing, or the like. Brick support hardware 6i3
The tips of the cooling plates 8 and 9 fit and support the furnace wall bricks 5, and are provided with an appropriate sloped portion 1 to prevent them from falling into the furnace. Furnace wall bricks 5 are formed in advance and are wedge-fitted and supported by brick support hardware 6, sloped portions 12 of cooling plate 8, and sloped portions 11 of cooling plate 9.

In assembling this stave, the cooling water piping 3 and the embedded bricks 2 are cast simultaneously to create the stave l, and the brick holding hardware 6 and the cooling w18.9 are fixed to this stave.
Furnace wall bricks 5 are fitted and fixed. In the furnace protection wall shown in FIG. 1 assembled in this way, the presser foot 6
are cooled and protected by the upper cooling plate 9, making it possible to avoid falling off of the bricks 5 due to melting and embrittlement due to heat load in the furnace, as in the conventional case.

Furthermore, the cooling plate 8 provided in the middle part of the stave supports the upper and lower furnace wall bricks 5, and increases the cooling ability of the furnace body protection wall.
Damage (spalls, cracks, etc.) to the furnace wall bricks 5 is prevented, and even if the furnace wall bricks 5 are damaged, the upper and lower clamping forces prevent the furnace wall bricks 5 from falling off.

This makes it possible to maintain a stable function of the furnace protection wall over a long period of time.

[Effect of the invention 1 The furnace body protection wall of the present invention has the following features: l) The furnace wall bricks are reliably held by fitting and supporting the furnace wall bricks into the furnace inner front surface of the stave body with the furnace wall brick supporting hardware and the cooling plate. In addition, even if cracks occur in the furnace wall bricks due to thermal spalls, etc., they will not fall off in a short period of time, and the inner surface shape of the furnace wall bricks can be maintained stably over a long period of time. .

2) Since the furnace wall bricks can be installed in advance at a factory etc. so that they are firmly attached to the front of the stave, the cooling effect of the furnace wall bricks can be enhanced, and cracks caused by thermal spalls due to the heat load inside the furnace can be improved. It is possible to prevent the occurrence of cracking and decrease in strength, and extend the life of the brick.

3) The furnace wall bricks can be integrated into the stave and attached to the blast furnace shell, reducing the work of laying bricks inside the furnace.
It is possible to shorten the process in the later stages and reduce equipment costs.

Thereby, the life of the blast furnace body can be dramatically increased.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing the furnace protection wall of the present invention, Fig. 2 is a view taken in the direction of arrow A in Fig. 1, Fig. 3 is a view taken in the direction of arrow B in Fig.
The figure is a view in the direction of the C arrow in FIG. 1, FIG. 5 is a view in the direction of the D arrow in FIG. 4, FIG. 6 is a view in the direction of the E arrow in FIG.
FIG. 8 is a partial sectional view showing a conventional furnace body protection wall, FIG. 9 is a partial enlarged view of FIG. 8, and FIG. 10 is a partial enlarged view of FIG. 8. l...Stave 1a...Brick holder tb...Stave convex portion l'd...Cast nut le, 1f...-hole 1g...Bolt seat fitting recess ih...Water supply and drainage pipe seat Fitting recess 2...Cast brick 3...Steel pipe 4...Steel shell 5...Furnace wall brick 6...Brick retainer 6a...Bolt 6b...Ceramics 7...Filling material 8...Cooling plate 8a...Cooling plate mounting bolts 8b...Cooling plate water supply and drainage pipe 8c...Cooling plate bolt seat Figure 1 8d...Cooling plate water supply and drainage pipe seat 8e...Ceramics 9. ...Cooling plate 9a...Bolts 9b...Ceramics IO-...Furnace protection wall

Claims (1)

[Scope of Claims] 1. In a blast furnace body protection wall formed by embedding bricks in advance in a stave that protects the blast furnace body shell from heat load in the furnace, a brick presser is placed at the upper end of the stave body, and at the midsection and lower end of the stave body. A cooling plate was fixedly attached to the stave body so as to protrude from the front side of the stave toward the inside of the furnace, and preformed furnace wall bricks were fitted between the bricks and the cooling plate and between the cooling plates to support them. A blast furnace furnace body protection wall featuring: 2. The blast furnace body protection wall according to claim 1, wherein the inner end of the brick presser foot and/or the cooling plate is coated with ceramics.