JPS6043405B2 - Blast furnace furnace wall deposit removal equipment - Google Patents

Description

Detailed Description of the Invention The present invention is a method for removing deposits on the inner wall of a blast furnace, which is capable of removing deposits on the furnace wall from the inside of the furnace in a hot state (reduced wind rest state) without blowing up the blast furnace. There is information about equipment.

Generally, when deposits are generated in a blast furnace, the reducing gas within the furnace drifts, making it difficult for the blast furnace to perform a proper reducing action, and causing unstable operation of the furnace. Furthermore, at the end of the blast furnace's life, the furnace wall refractories fall off and wear out locally, and a large load is placed on the shell in that area, causing problems such as cracks in the shell and gas leaks. For this reason, it is necessary to repair the furnace wall as soon as possible. However, when performing this repair, if there is any deposits on the furnace wall at the location to be repaired, a proper repaired wall cannot be constructed, so it is necessary to remove the deposits. As is clear from these examples, it is wise for operations to remove deposits as soon as they occur on the furnace walls.

For this reason, as a conventional proposal for removing the deposits on the walls of blast furnaces, there is a method in which the blast furnace charge is reduced below the deposits, allowed to rest or blow up, and then removed by dynamite blasting.
In addition, the thermal shock method proposed by the present applicant (which uses temperature differences to create cracks, distortions, etc. in the deposits and removes them by shock), There are methods for removing deposits by colliding with them to remove materials that do not interfere with the reactor, and methods for removing deposits by attaching a deposit removal device to an arm or arm support that can be moved up and down in the furnace repair equipment. Each of these known methods can be used or not depending on the situation (growth, location) of the furnace wall deposits, and the common drawback is the problem of furnace wall deposits and the appropriate This is difficult to remove.

For example, if deposits have grown beyond the damaged part of the furnace wall to the shell or cooling system, it is impossible to remove them completely without damaging the shell or cooling system. be. If the deposits cannot be almost completely removed and a repaired wall is constructed, even if you try to attach studs to the steel shell or cooling device to make the repaired wall more robust, the problem will be affected by the remaining deposits. It cannot be fixed securely. Therefore, even if a repaired wall is constructed by covering the unstablely fixed studs with sprayed refractory or poured refractory material, the studs will not fall off because they are unstablely fixed, and the repaired wall will never be solid. cannot be configured. For this reason, the lifespan of the repaired wall is short, and therefore the construction of the repaired wall is required repeatedly. In addition, if a large amount of deposits remains after removal, it may become a factor in the generation of deposits again, or it may cause uneven descent of the blast furnace charge, which may impair the furnace condition. Therefore, it is important that the deposits on the walls of the blast furnace can be removed carefully, with as little remaining amount as possible, and to the extent that the inner surface of the steel shell is exposed.

In view of this situation, the present invention aims to provide a blast furnace furnace wall deposit removal device that can almost completely remove the furnace wall deposits, and the present invention will be described below based on the drawings. The apparatus of the present invention will be explained below based on the drawings.

Fig. 1 is an explanatory diagram showing the state in which the present invention device is charged into a blast furnace during reduced wind rest, Fig. 2 is a view taken from arrow A-A in Fig. 1,
The figure is an enlarged explanatory view of the main part of FIG.

As is clear from these drawings, the sending device 30 of the present invention has the support beam 2 with the rotating device 1 attached thereto placed in the open furnace top manhole 3, and the rotating member 4 of the rotating device 1. The rod 6 fitted with the bit 5 is suspended so that it can be raised and lowered, and the bit 5 is inserted through the opening 8 of the steel shell 7 (for example, an opening for mounting a cooling plate, an opening prepared by cutting the steel shell). The drive unit 10 is connected to a drive device 10 via a connection member 9.

In FIG. 1, the support beam 2 is inserted through one of the furnace top manholes 3 and is movably arranged along the furnace top working floor 11, but the present invention is not limited thereto.

For example, instead of the illustrated example, the support beam 2 may be placed across both of the furnace top manholes 3 to sufficiently fulfill its role. Which of these methods to adopt may be selected by considering, for example, whether the furnace top structure is a PW type or a bell type, the size of the device (for example, the relationship with the load), workability, etc. A drive device 24 is mounted on the support beam 2 at a location outside the furnace, and the drive device 24 and the swing device 1 are attached via a pulley 12.

The rotating device 1 is provided at a position inside the furnace of the support beam 2, and supports the rotating member 4 via a shaft 13. A rod 6 on which a bit 5 is fitted is suspended from the rotating member 4 so as to be movable up and down by guiding a suspension member such as a wire 14. The wire 14 is led out of the furnace through the furnace top manhole 3 and can be freely raised and lowered without any trouble in turning. As shown in FIG. 3 in an enlarged manner, one example of the manner in which the bit 5 is installed is to penetrate the inside of the rod 6 that is suspended so that it can be raised and lowered, and to open the opening in the steel shell 7 (for example, an opening provided by removing the cooling device). ) Connecting member 9 charged from 8
It is connected to the drifter 15 of the drive device 10 via.
The drive device 10 is configured such that a drifter 15 is attached to a roller chain 17 driven by an air motor 16, and the position of the drifter 15 can be adjusted in the direction inside the furnace or the direction outside the furnace. Also roller chain 17
The entire drive device 10 including the above is configured to be rotatable in the circumferential direction of the blast furnace. Therefore, the bit 5 is placed in the vertical direction inside the blast furnace.
"The position can be freely changed in the circumferential direction. In the figure, 18 is a cooling device, 19 is a furnace wall, 20 is a furnace wall deposit, and 21 and 22 are for air motor drive (for forward and reverse rotation). ), and 23 indicates the blast furnace charge.

Now, in order to operate the apparatus 30 of the present invention, it is a prerequisite that the blast furnace is first operated with reduced wind capacity, and this is carried out by selecting from various means already proposed by the present applicant.

The blast furnace charge 23 is reduced in size below the furnace wall deposits 20.

Next, the furnace top manhole 3 is opened and the support beam 2 with the rotating device 1 attached thereto is inserted into the furnace. At the time of this charging, the rod 6 fitted with the bit 5 is attached in advance to the turning member 4 of the turning device 1 using the wire 14 as a guide, so that the rod 6 can be charged into the furnace together with the support beam 2. Next, since an opening 8 (for example, the opening from which the cooling device 18 was removed) has already been provided in the steel shell 7 facing the place from which deposits have been removed (or the place to be repaired), the rod 6 is lowered by operating the wire 14 to this point. do.

As soon as the rod 6 reaches the predetermined position, the connecting member 9 is connected to the bit 5 and also to the drive device 10. (3rd
The figure shows an example in which the drifter 15 and the bit 5 are connected via a connecting member 9. ) Next, while observing the inside of the furnace through the opening 8, the bit 5 is brought into contact with the place from which deposits are to be removed.

At this time, adjustment in the height direction is performed by operating the wire 14, and forward and backward adjustment in the direction of the furnace wall is performed by the air motor 16.
This is done by operating the roller chain 17 with forward and reverse operations. Further, the operation of the furnace wall 19 in the circumferential direction is performed by a drive device 10.
This is accomplished by rotating the entire body in the circumferential direction, and by rotating the rotating device 1, the rotating member 4 pivots about the shaft 13, and the rod 6 pivots under the action of the tension of the wire 14. Furthermore, the removal of the deposits 20 on the furnace wall is carried out using the drifter 15.
is driven and removed by bit 5. Due to the interaction (combined action) as described above, the deposits on the furnace wall are almost completely removed. After observing the removal work through the opening 8 and determining that the objective has been achieved, the apparatus is removed from the furnace.

First, reverse the air motor 16 and connect the roller chain 1.
7 is moved backward, and the connecting member 9 is removed from the bit 5 at the opening 8. Next, the wire 14 is rolled up to lift the rod 6 to a position where it is likely to come into close contact with the rotating member 4.
Next, the support beam 2 is moved toward the outside of the furnace, and the wire 14 is loosened in accordance with the movement, and the apparatus 30 of the present invention is removed from the furnace top manhole 3 to the outside of the furnace. Since the apparatus 30 of the present invention is constructed and operates as described above, it has the effect of substantially completely removing the deposits on the furnace wall from inside the blast furnace in a hot state, which is the initial objective.

In particular, the device of the present invention is capable of removing deposits on the furnace wall while observing them from the opening or the furnace top manhole, and also allows the bit to come into contact with the deposits on the furnace wall as described above. Therefore, it has the effect of almost completely removing it.

[Brief Description of the Drawings] Fig. 1 is an explanatory diagram showing the state in which the apparatus of the present invention is charged into a blast furnace during reduced wind rest, Fig. 2 is a view taken along arrow A-A in Fig.
The figure is an enlarged explanatory view of the main part of FIG. 1. 1...Swivel device, 2...Support beam, 3.
...Furnace top manhole, 4...Swivel member,
5... Bit, 6... Rod, 7...
...Iron skin, 8...Opening, 9...
Connection member, 10... Drive device, 11...
Furnace top working floor, 12... Worm gear, 13...
...Shaft, 14...Suspension material, 15...Drifter, 16...Air motor, 17...
・Roller chain, 18... Cooling device, 19...
...Furnace wall, 20...Furnace wall deposits, 21...
... Air supply pipe (for forward rotation), 22 ... Air supply pipe (for reverse rotation), 23 ... Blast furnace charge, 24 ... Drive device, 30 ... Blast furnace Furnace wall deposit removal equipment.

Claims (1)

[Claims] 1. Insert and arrange the support beam with the rotating device attached to the open furnace top manhole, and suspend the rod with the bit attached to the rotating member of the rotating device so that it can be raised and lowered, and also attach the bit to the steel shell. A blast furnace wall deposit removal device, characterized in that it is connected to a drive device via a connecting member inserted through an opening.