JPS6043881B2 - Dismantling and removal method of lattice bricks inside hot air stove - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dismantling and removing hot blast furnace lattice bricks attached to a blast furnace by instantly blasting and dismantling them using explosives.

Traditionally, when renovating the lattice bricks inside a hot-air stove, the dismantling and removal work required the inside of the furnace to cool down over a long period of time, and then workers entered the furnace through a manhole at the top of the hot-air stove and manually dismantled it. It was on. In other words, the disassembly method involved removing the lattice bricks one by one from the upper layer and dropping the dismantled bricks into a vertical chute that had been installed upright in the upright tube of the combustion chamber in the furnace or on the outer wall of the furnace for discharge. However, the conventional dismantling method described above requires a cooling period and requires manual labor, which results in a long construction period.Harmful dust is scattered and suspended inside the sealed furnace, which is unfavorable for hygiene. There were a number of drawbacks, such as poor footing inside and extremely dangerous conditions for large numbers of workers to work on for long periods of time.

Therefore, the purpose of the present invention is to realize a method for dismantling and removing the lattice bricks inside a hot blast furnace, which requires an extremely short repair period, is easy to work with, allows the reuse of the iron shell, and is safe. There is something to do.

Examples of the present invention will be described in detail and specifically below based on the drawings. First, as shown in FIG. 1, an opening 6 is bored in the lower steel shell 4 of the hot blast stove 2.

Note that the opening 6 is located above the receiving plate 8 and on the opposite side to the partition wall 9. Alternatively, as shown in phantom lines in FIG. 4, it may be provided near the partition wall 9. In other words, an opening is provided in a portion facing the partition wall 9 that can be affected by the partition wall 9,
Consideration should be given so that when the bricks explode and fall, the brick fragments are automatically directed to the discharge opening due to the effect of the bulkhead. Next, the ventilation holes 14 of the lower lattice brick 12 are opened from the furnace bottom 10.
Furthermore, explosives 17 are loaded into predetermined locations of the ventilation holes 14 of the upper lattice brick 13 from the manhole 16 in the upper part of the furnace (see FIG. 2). The explosives can be loaded into the upper lattice bricks 13 by hanging them from above into the ventilation holes 14 with strings, and into the lower lattice bricks 1.
For No. 2, loading can be done from below using a loading rod or the like.
Once the above preparations are complete, the loaded explosives will be detonated.

Unfortunately, the lattice bricks, which have a large number of ventilation holes 14 and have a porosity of approximately 70% in the horizontal cross-sectional area, are blasted and the ventilation holes 14 disappear, leaving a large cavity at the explosion site. is formed. At the same time, the first crushed lower lattice brick 12 portion is automatically and directly discharged from the furnace through the openings 6 provided at opposite positions of the partition wall 9 due to the explosive force and the effect of the partition wall 9. . Furthermore, an avalanche phenomenon occurs in which the upper lattice bricks fall and fill the cavities created in various explosion parts of the lattice bricks. Then, the lattice bricks fall naturally and repeatedly collide with each other to be further broken down into small pieces, and these small brick pieces are also
As shown in the figure, it is automatically flushed out of the furnace through an opening 6. At this time, adjust the amount of explosives so as not to destroy the iron skin 4. According to the present invention, only the lattice bricks in the furnace are crushed, as is clear from the detailed description of the invention. This construction method is economical as it allows the reuse of the steel shell that would otherwise damage the outer shell of the furnace.

In addition, the lattice bricks inside the furnace are crushed and most of them are discharged through the opening at the bottom of the furnace by natural flow, making it easy to dismantle and remove them.Moreover, this work is done instantly, significantly reducing the period of renovation work. Can be shortened. Furthermore, since work inside the reactor, which has a poor working environment, is almost unnecessary, safety and health problems are also solved. Furthermore, since the iron shell functions to prevent the explosive force from spreading to the outside, it is possible to prevent fragments and dust from scattering to the outside, making it safe and sanitary.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a hot air stove, FIG. 2 is an enlarged view of a portion viewed from the arrow ■ in FIG. 1, and FIG. 3 is a perspective view showing the structure of a lattice brick. ,・Figure 4 is the ■ of Figure 1
It is a sectional view taken along the line -■.

Claims (1)

[Claims] 1. Explosives are placed in the ventilation holes of the upper and lower lattice bricks of the hot air stove, and openings for discharging the lattice bricks are drilled in the outer wall opposite the partition and above the receiving plate, and the explosives are A method for dismantling and removing lattice bricks in a hot air stove, characterized in that the lattice bricks are crushed and fallen by exploding, and the broken brick pieces are automatically discharged from the opening.