JPS61177306A - Method for disassembling and removing checker brick in hot stove - Google Patents

Abstract

PURPOSE:To make easy an operation and to end safely an operation in a short period by exploding the lower part of an outside wall, checker bricks posts, etc., by the explosive loaded in a furnace to form an aperture to the gate part of a shell and discharging the splinters to the outside of the furnace. CONSTITUTION:The explosive is loaded respectively to the checker bricks 14, 16, the lower part of the outside wall 4 forming the gate part 32 and the posts 20 in the hot stove 2. The gate part 32 is formed by a half cutting line 30b to the shell 6 in the explosive charged part in the lower part of said wall 4. The aperture 28 is produced in the gate part 32 by the explosion of the explosive to disintegrate and drop the bricks. The brick splinters are automatically discharged through the aperture 28.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for dismantling and removing bricks inside a hot blast furnace, and in particular, the method for instantly blasting and dismantling bricks inside a hot blast furnace attached to a blast furnace using explosives. This paper relates to a method for dismantling and removing hot blast stove lattice bricks.

[Prior Art] A blast furnace is attached to a hot blast furnace, and the hot blast furnace preheats air to be fed to the blast furnace.

Recently, a heat storage type hot blast furnace is often used, in which the lattice bricks in the heat storage chamber are heated by the molten steel furnace exhaust gas, heat is accumulated in the lattice bricks, and then the flow of the blast furnace exhaust gas is stopped. Air is sent from the opposite direction, this air picks up heat from the lattice bricks, raises the temperature, and supplies high-temperature hot air to the blast furnace. Then, the blast furnace exhaust gas flows into the cooled heat storage chamber again to heat the lattice bricks.

By the way, when repairing the lattice bricks inside the hot-air stove, the dismantling and removal work first takes a long time to cool the inside of the furnace, and then workers enter the furnace through the manhole at the top of the hot-air stove and dismantle it manually. was.

In other words, it was a dismantling method in which the lattice bricks were sequentially removed from the upper layer, and the dismantled bricks were dropped into a vertical chute that had been installed upright on the riser of the combustion chamber in the furnace or on the outer wall of the furnace and then discharged. In addition, demolition and removal work involves drilling holes in the lining bricks from the iron skin of the hot stove, loading explosives into the holes, and demolition by blasting.

[Problems that the invention aims to solve] However, the former demolition work requires a cooling period and is manual labor, which results in a long construction period, and harmful dust is scattered and suspended inside the sealed furnace, causing sanitary problems. This is not preferable and requires scaffolding for the work, making it difficult to install.

In addition, in the latter demolition work, the steel shell is damaged, making it impossible to reuse it, and furthermore, dust and crushed brick pieces are scattered from the existing openings, which is both dangerous and undesirable from a sanitary standpoint. There wasn't. Furthermore, it is difficult to dismantle the pillars when repairing them, and improvements have been desired.

[Object of the Invention] Therefore, the object of the present invention is to eliminate the above-mentioned disadvantages, to make the repair period for the furnace lattice bricks extremely short, to be easy to work with, to be able to reuse the steel shell, and to be safe. The goal is to realize a method for dismantling and removing the lattice bricks inside a hot air stove.

Means for Solving Problem E] In order to achieve this object, the present invention charges the lattice bricks in the hot air stove, charges the lower part of the outer wall forming the gate part, and The pillar supporting the structure is also charged, and the gate section is formed by a half-cut line on the iron shell of the charged section at the bottom of the outer wall, and the gate section is opened by the explosive force of the explosive and the pressing force of the crushed brick pieces. Open it to reveal the opening,
The present invention is characterized in that the lattice bricks are crushed and dropped by blasting, and the brick fragments are automatically discharged from the openings.

[Operation] As described above, according to the present invention, the explosion of the explosives loaded in the furnace causes the lower part of the outer wall forming the gate part to explode, as well as the lattice bricks and pillars, thereby causing the steel shell to be cut in half. The gate portion formed by the line opens to reveal an opening through which brick debris is discharged.

Therefore, the work of dismantling and removing the lattice bricks can be easily carried out without damaging the iron skin outside the furnace, which is economical and also significantly shortens the period of repair work. Further, work inside the furnace, which has a poor working environment, is almost unnecessary, and since the opening is blown up in a closed state, it is safe and sanitary.

[Embodiments of the Invention] Examples of the present invention will be described in detail and specifically below based on the drawings.

1 to 5 show embodiments of this invention. In the figure, 2 is a hot air stove. This hot air stove 2 is formed by an outer wall 4, and this outer wall 4 is surrounded by an iron skin 6. Inside the hot air stove 2, a heat storage chamber 10 is defined by a partition wall 8, and within this heat storage chamber 10 there is a lower lattice brick 14 having ventilation holes 12 and a lower lattice brick 14 connected to the lower lattice brick 14. Bricks 16 are arranged. The lower lattice bricks 14 are erected on a receiving plate 18, and this receiving plate 18 is supported by a plurality of pillars 20.

A bottom brick 22 is placed at the bottom of the hot air stove 2, and a dome portion 24 is provided at the top of the hot air stove 2. A plurality of manholes 26 are attached to this dome portion 24.

The lower part of the outer wall 4 on the side of the heat storage chamber 10 where the gate part 32 (described later) is to be formed, that is, the steel skin 6 from approximately the bottom of the outer wall 4 to slightly above the receiving plate 18, is exposed to the explosive force of the explosive and the pressure of the crushed brick pieces. A gate portion 32 is formed by a half-cut line 30 in order to expose the opening 28 by pressure. This gate part 3
2 is formed into a left gate part 32a and a right gate part 32b by a central vertical line 30a. In other words, the left and right gate parts 32a and 32b have a rectangular shape with a central vertical line 3Qa oriented in the vertical direction, and upper and lower central parts oriented in the horizontal direction and whose central parts are continuous with both the upper and lower ends of this central vertical line 30a. stacked line 30
b, 30c, an opening left turn curve 30d and an opening right turn curve 30e that are continuous and, for example, intermittently formed at both ends of the upper stack line 30b and the lower stack line 30c and are approximately parallel to the central vertical line 30a. Consisted of. At this time, the central vertical line 30a is formed by a continuous cutting line, and the upper,
The lower horizontal lines 30b and 30c are also formed by continuous cutting lines. Further, the opening left-turn curve 30d and the opening right-turn curve 30e are formed by continuous cutting lines. The opening portion 28 is exposed on the side of the heat storage chamber 10 where the gate portion 32 is formed, and is arranged so that the crushed brick pieces are automatically directed toward the lower part of the hot air stove 2.

Next, as shown in FIG.
Explosives 34 are loaded into predetermined locations of the ventilation holes 12 of the upper lattice bricks 16. In addition, the loading of this hot water medicine 34 is as follows:
Explosives 34 may be hung from above into the ventilation holes 12 for the upper lattice bricks 16 using hanging tools such as strings, and explosives 34 may be hung from below for the lower lattice bricks 14 using tools such as loading rods. Just load it. Further, on the outer wall 4 of the left and right gate portions 32a and 32b formed on the iron skin 6,
Explosive charges 34 are loaded from the outside and from the inside. Furthermore, the explosives 34 are loaded only into the pillars 20 of the four outer walls where the gate portion 32 is formed. In other words, the explosives 34 are not loaded in the 20 rows of columns facing the position where the gate portion 32 is formed.

When the above preparations are completed, the loaded explosive 34 is detonated. Then, the left and right gate parts 32a formed on the iron skin 6
, 32b is destroyed and this part disappears, and the left and right gate parts 32a, 32 are destroyed by the explosive force.
b is bent around the opening left-turn curve 30d and the opening right-turn curve 30e to become double-sided, and the opening 28 is exposed. At the same time, as shown in FIG.
The receiving plate 18 provided at the top of the 0th row is the remaining support 20
Tilt downward using the fulcrum as a fulcrum. Also at this time, ventilation hole 1
2, the lattice bricks, which have a porosity of 70% in horizontal cross-section, are blown up, the ventilation holes 12 disappear, and a large cavity is formed at the location of the explosion. First, the crushed lower lattice bricks 14 flow down along the receiving plate 18 and into the opening, since the outer wall 4 side end of the receiving plate 18 is inclined toward the bottom side of the opening 28 where the outer wall 4 side end is exposed. It is automatically discharged from the furnace from the section 28. At this time, left and right gate sections 3
2a and 32b spread due to the pressing force of the crushed pieces and function as guide plates for the crushed pieces.

Furthermore, an avalanche phenomenon occurs in which the upper lattice bricks 16 fall and fill the cavities created in various exploded parts of the lattice bricks. Then, the lattice bricks fall naturally and repeatedly collide with each other, becoming further broken into pieces.
These brick pieces are also guided by the receiving plate 18 and the left and right gate parts 32a and 32b as described above, and are automatically discharged from the opening 28 to the outside of the furnace.

At this time, the amount of explosives is adjusted so as not to destroy the iron skin 6. The iron shell also has the function of preventing the scattering of fragments and dust due to an explosion.

As a result, the brick fragments are guided to the receiving plate 18 and the left and right gate portions 32a, 32b, and are discharged from the opening 28 to the outside of the furnace. Furthermore, since the opening 28 is closed during the explosion, crushed brick pieces and dust will not be scattered outside, making it safe and sanitary. Furthermore, since the opening 28 is exposed at the bottom of the outer wall 4, it is possible to easily remove crushed pieces of lattice bricks and pillars.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made.

For example, it is also possible to form the column 20 in a cylindrical shape, fill water in the column 20, and load explosives into the water. In this way, compared to drilling and blasting the pillar-shaped support 20, the amount of charge can be reduced and the cost can be reduced.

Further, the left and right gate portions 32a and 32b formed on the iron shell 6 by the half-cutting line 30 are not limited to a rectangular shape, but may be formed in other shapes such as a triangle.

Furthermore, although a cutting line that is continuous with the cutting line is formed as the half-cutting line, it is also possible to reduce the thickness of the iron skin at a desired part, that is, to form a sushi, and to function as a half-cutting line.

[Effects of the Invention] As is clear from the detailed explanation above, according to the present invention,
It is economical because the steel shell outside the furnace can be reused without being damaged during the dismantling and removal work of the lattice bricks and columns. In addition, since the hot blast furnace has an opening that discharges the broken brick pieces using the explosive force of the explosive and the pressing force of the broken brick pieces, there is no habit of dust and broken brick pieces being scattered outside from the opening. , safe and hygienic. Furthermore, since most of the lattice bricks inside the furnace are crushed and discharged through the opening at the bottom of the furnace by natural flow, they can be easily dismantled and removed, and the demolition work can be completed instantly, reducing the period of renovation work. It can be significantly shortened. Furthermore, since the work inside the furnace, which has a poor working environment, is almost unnecessary, safety and health problems can be solved.

In addition, if only the lower pillar of the outer wall that forms the gate is blown up and the receiving plate is tilted toward the bottom of the opening, the crushed brick pieces can be discharged more smoothly and the work of removing the crushed pieces becomes easier. .

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention. FIG. 1 is a schematic vertical cross-sectional view of a hot air stove, FIG. 2 is an enlarged view of the direction indicated by the arrow ■ in FIG. FIG. 4 is a schematic enlarged sectional view taken along arrows It/-IV in FIG. 1, and FIG. 5 is a schematic view of a state in which crushed pieces are discharged. In the figure, 2 is a hot air stove, 4 is an outer wall, 6 is an iron shell, 8 is a partition wall, 10 is a heat storage chamber, 12 is a ventilation hole, 14 is a lower lattice brick, 16 is an upper lattice brick, 18 is a receiving plate, 20 is a pillar, 28 is an opening, 30 is a half-cut line, 32 is a gate part,
And 34 is an explosive.

Claims (1)

[Claims] Charge the lattice bricks in the hot air stove, charge the lower part of the outer wall that forms the gate, charge the pillars that support the lattice bricks, and charge the iron shell at the charged part of the lower part of the outer wall. The gate part is formed by a half-cut line, and the gate part is opened to reveal an opening by the explosive force of the explosive and the pressing force of the crushed brick pieces, and the lattice bricks are crushed and fallen by blasting. 1. A method for dismantling and removing a hot blast stove lattice brick, characterized in that the brick fragments are automatically discharged from the opening.