KR20020048559A - apparatus for spraying castable to wall of furnace - Google Patents

Abstract

PURPOSE: An apparatus for spraying repairing materials onto the wall of a blast furnace is provided to prevent vibration of a nozzle body due to spray pressure by simultaneously spraying the repairing materials from both ends of the nozzle body, increase adhesion ratio of the repairing materials, and shorten repairing time. CONSTITUTION: In an apparatus which is connected to a wire rope of a manipulator so that the apparatus is entered into a blast furnace so as to be moved up and down, and equipped with a nozzle body supplying repairing materials through a supply hose connected to a feed gun so as to spray the repairing materials onto the inner wall of the blast furnace, the apparatus comprises a spray adaptor(50) which is installed on the lower surface of the nozzle body, and in which a plurality of repairing material exit lines(51a,52a) are symmetrically arranged around a repairing entrance line(53a) connected to the supply hose; and spray nozzles(51,52) each of which are exchangeably assembled onto the repairing material exit lines(51a,52a) so as to spray repairing materials supplied through the repairing entrance line(53a) onto the inner wall side of the blast furnace in an equal spray pressure.

Description

Approtus for spraying castable to wall of furnace}

The present invention relates to a device for injecting a repair material for repairing the furnace wall of the blast furnace, and more particularly, to spray the repair material at the same injection pressure left and right to prevent the left and right shake during the repair work, to increase the repair material adhesion rate, to improve the furnace wall repair work time The present invention relates to an improved blast furnace wall repair material spraying device.

In general, the blast furnace process charges coke as fuel and iron ore as raw materials through a charging hole in the upper part of the furnace, and burns coke by blowing hot coke through a vent hole at the bottom of the blast furnace to produce heat and reducing gas. The reduced molten iron ore in the furnace to produce molten iron and slag, the melt is discharged through the outlet of the blast furnace bottom.

The blast furnace body structure is made of steel shell on the outside, and the inside is made of high strength refractory to withstand high temperature and gas, and between the soft and refractory refractory to insert a cooling panel to cool to protect the refractory and steel shell from high temperature It is.

However, as the aging of the blast furnace increases, the refractory damage and abrasion progress, so that the cooling plate protrudes, the cooling plate breakage increases, and the steel shell is accumulated and cracked to become an operation instability factor.

Therefore, in order to solve this problem, it is necessary to repair the walls, and at that time, the walls should be repaired at least once every six months, considering that the service life of the castable refractory is 5 to 6 months.

In other words, as a method of repairing a furnace wall, methods such as furnace press and spray spray are widely used, in which furnace press is carried out in a state in which a charge is filled in the blast furnace, and the outer surface of the blast furnace is repaired. In this case, the refractories of the damaged furnace body are repaired by making a hole in the furnace and inserting the press-fitting material into the furnace through the hole.

In addition, in the method of spray repairing a furnace wall, as shown in FIG. 1, the charged material 4 in the blast furnace 10 is dropped to the site | part to which a furnace wall is to be repaired, and the sealing material 3 is covered on the upper surface. , The spray main body 2 connected to the wire rope 14 of the manipulator 1 is lowered into the blast furnace so as to be allowed to enter the blast furnace 10, and then the spray nozzle 9 is discharged from the spray nozzle 9. Spray the repair material onto the refractory surface constructed on the inner surface of the furnace wall. At this time, the repair material stored in the reservoir 8 installed outside the blast furnace 10 is supplied to the spray nozzle 9 through the feed gun 7 and the supply hose (7a).

The repair material made of a refractory material (castable) for spraying during the repair work by spraying the repair material to the building refractory side through the spray nozzle 9 is concentrated and sprayed at 1 ~ 2m from the furnace wall to form a solid layer. The life expectancy is estimated to be about six months.

In FIG. 1, reference numeral 5a denotes a starting port, and 11 denotes a shell.

After the repair work is completed as described above, the charging is filled in the blast furnace 10 and the hot air is blown through the tuyere 5 to resume operation. At this time, in order to ensure a smooth operation rise, load drop and stability of gas flow after restarting the operation, it is necessary to minimize the amount of repair material loaded on the upper part of the sealing material 3 after being sprayed during the repair work and falling down. Should be removed as soon as possible.

That is, when the repairing material removed during the repairing operation forms a rebound loss layer 21 stacked in a donut shape on the upper surface of the sealing material 3, as shown in FIG. As shown in FIG. 3, the donut-shaped rebound loss layer 21 initially flows the gas flow only to the center portion, and the gas flows only to the wall while descending, thereby providing blast furnace 10. It can interfere with the melting of the charges inside, which can act as a long-term instability factor in the operation.

In addition, if the long-term high-temperature operation is continued to remove the rebound loss layer 21 accumulated on the top of the sealing material 3 after the furnace wall repair work, the refractory of the blast furnace 10 is damaged, silicon (Si) in the molten iron rises. It causes.

On the other hand, the conventional injector used to repair the blast furnace wall, as shown in Figure 4, the spray main body 2 is raised and lowered inside the blast furnace 10 by a wire rope 14 wound on the pulley (15) And the 'L' shaped adapter 17 connected to the inlet end to which the repair material is supplied, the spray nozzle 9 assembled to the outlet end of the adapter 17, and the left and right balance of the adapter 17. It is composed of a weight (16) mounted on the rear end.

When performing the repair of the furnace wall while spraying the repair material using one spray nozzle 9 provided in the conventional injector, the injection pressure of the repair material sprayed from the spray nozzle 9 by the action and reaction law is As the nozzle body 2 retreats backward, the gap 10 between the furnace wall and the end of the spray nozzle 9 is opened, and the nozzle body 2 swings from side to side due to an imbalance of force. Pendulum movement is made, which is more severely generated as the nozzle body 2 is lowered to repair the lower inner wall of the blast furnace (10). At this time, the amount of adhesion of the repairing material is small, irregular surface shape, and the repairing material is not filled with a lot of pores in the repairing surface.

In addition, if the amount of the rebound loss layer due to the repairing material falling without being attached to the furnace wall after spraying is relatively increased, the loss of material costs is large, and the operation return is delayed due to the decrease in breathability and the formation of deposits during the operation. It became.

That is, the maintenance work using the conventional water injector injection device is a characteristic that the nozzle body 2 must be sprayed while moving up and down, and thus the nozzle body 2 cannot be completely fixed mechanically. There was a problem that can not spray. In addition, the nozzle body (2) in which the spray nozzle (9) is installed in only one direction is sprayed because the left and right fluidity of the nozzle body (2) is severe due to the repulsive force according to the injection pressure (7 kg / cm 2) of the spray nozzle (9) during maintenance work. The gap between the nozzle 9 and the furnace wall cannot be kept constant. As the clearance distance increases, the alumina cement, which combines the castable aggregate and the aggregate with each other during the spraying of water, is blown into the dust, and the adhesion rate is significantly lowered. There was a problem that the surface is not filled with a lot of pores.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and the purpose thereof is to spray and repair the repairing material supplied to the nozzle body at both ends at the same time, thereby preventing the nozzle body from being shaken by the injection pressure and spray nozzles. It is to provide a blast furnace inner wall repair material spraying device that can minimize the rebound loss layer by maintaining a constant gap between the furnace and the furnace wall, while reducing the work time for repairing the furnace wall.

1 is a state diagram showing the operation of repairing the furnace wall using the repair material injection device according to the prior art,

Figure 2 is a schematic diagram showing a rebound loss layer generated during the maintenance work using the conventional repair material injection device,

Figure 3 is a schematic diagram showing the effect of the furnace gas flow by the rebound loss layer,

Figure 4 is a block diagram showing a maintenance material injection device according to the prior art,

Figure 5 is a block diagram showing a blast furnace wall repair material spraying apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

1 ...... Manipulator 2 ...... Nozzle Body

3 ...... Seal 4 .....

10 ..... Furnace Wall 14 ..... Wire Rope

50 ..... Spray Adapters 51,52 ... Spray Nozzles

51a, 52a ... repair re-entry line 53a .... repair re-entry line

55 ..... Control panel 56 ..... Distribution valve

As a technical configuration for achieving the above object, the present invention,

In the apparatus for injecting the repair material to the blast furnace inner wall having a nozzle body which is connected to the wire rope of the manipulator to enter the blast furnace to be moved to Shanghai, and the repair material is supplied through a supply hose connected to the feed gun,

The lower surface of the nozzle body is provided with a spray adapter in which a plurality of repair outlet lines are arranged symmetrically around the repair reentry line communicating with the supply hose, and the repair refill line is provided with the repair material supplied through the repair reentry line. By providing a blast furnace wall repair material injector, characterized in that the spray nozzles are assembled to replace each other so as to spray at the same injection pressure to the inner wall side of the blast furnace.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

5 is a block diagram showing a blast furnace wall repair material spraying apparatus according to the present invention, the apparatus 100 of the present invention, as shown, the spraying the repair material supplied into the nozzle body (2) evenly to the left and right sides at the same time By performing wall repair, the left and right shaking of the nozzle body 2 is minimized, and the repair material is attached to the furnace wall well.

That is, the nozzle is connected to the wire rope 12 of the manipulator 1 so as to enter the blast furnace inside and be moved as in the prior art, the nozzle for supplying the repair material through the supply hose (7a) connected to the feed gun (7) On the lower surface of the main body 2, the injection adapter 50 in which the refill exit lines 51a and 52a are formed symmetrically with respect to the refill entry line 53a communicating with the supply hose 7a can be replaced. To be installed.

Each of the water refilling outlets 51a and 52a of the injection adapter 50 sprays the water retaining material supplied through the water refilling inlet line 53a to the inner wall side of the blast furnace 10 at the same injection pressure. 52).

Here, the spray nozzles (51) and (52) are formed at the rear end of the male screw part and the screw thread formed on the inner circumferential surface of the repair refilling line (51a) (52a), respectively, the same distance from the inner wall of the blast furnace (10) It is preferable to be provided with a hollow pipe member having the same inner diameter size and length so that the repair material supplied in the state where the tip is maintained at the same injection pressure.

In addition, a control plate which is disposed between the repair outlet ports 51a and 52a in the internal flow path of the injection adapter 50 and is pivotally operated so as to adjust the supply amount of the repair material which is divided into the spray nozzles 51 and 52, respectively. (55) is provided and configured.

The lower surface of the injection adapter 50 forms a screw hole 57 so as to coincide with the center of the repair refilling line 53a, and the screw hole 57 is supplied through the repair refilling line 53a. The distribution side 56 formed at the top of the inclined surface 56a of the mountain-shaped cross section is configured to be able to change 90 ° from both left and right ends of the repair material flow path.

In addition, the inclined surface 56a of the distribution side 56 is preferably formed in an arc shape so as to minimize the frictional resistance of the water-retaining material distributed to the left and right ends.

The operation and effects of the present invention having the configuration as described above will be described.

First, in order to repair the furnace wall of the blast furnace 10 by spraying the repair material supplied from the feed gun 7 using the apparatus 100 of the present invention, the furnace wall is to be repaired with the charges 4 charged in the blast furnace. It descends to the water level and the sealing material 3 is thrown into the upper surface.

In this state, the nozzle body 2 is suspended from the wire rope 14 of the manifold 1 and the spray nozzles 51 and 52 are mounted on the symmetrical structure, respectively. The wire rope 14 is then slowly released to lower the nozzle body 2 downward, and the spray nozzle 51 (52) of the nozzle body 2 coincides with the wall position to repair the furnace wall. When it is determined that the wire rope 14 is released, the loosening of the wire rope 14 is stopped.

Continuously stored in the storage tank (8) is mounted on the lower surface of the nozzle body (2) via a supply hose (7a) connected to the feed gun (7), the injection adapter connected to the supply hose (7a) ( 50) is supplied into the repair reentry line 53a. At this time, the control plate 55 disposed in the repair material supply flow path of the injection adapter 50 is coincident with the center line of the repair material inlet line 52a so that the supplied repair material is evenly distributed to the left and right sides.

Then, the repair material supplied to the repair material inlet line 53a is mounted on the lower surface of the injection adapter 50 so as to hit the inclined surface 56a of the distribution side 56 of the projected upper end surface, thereby providing frictional resistance to both the left and right sides. Spray nozzles 51 and 52, each of which is distributed evenly and minimized, are supplied to the refurbishment outlet lines 51a and 52a, respectively, and the refurbishment material divided into the left and right sides is assembled to the refurbishment outlet lines 51a and 52a, respectively. It is sprayed to the furnace wall facing this through the end of the) to repair the furnace wall.

At this time, since the refill injection pressure sprayed through the spray nozzles 51 and 52 provided in the symmetrical structures on both the left and right sides of the injection adapter 50 are the same, the nozzle body 2 is the manipulator 1. It is possible to repair the furnace wall evenly in the state always located in the center of the blast furnace without any sway from side to side with the connection point of). Accordingly, it is possible to increase the adhesion rate of the repair material sprayed through the spray nozzles 51a and 52 to the furnace wall, and to reduce the amount of rebound loss that the repair material drops to the lower part after the spraying.

On the other hand, during the maintenance work for spraying the repair material to the furnace wall through the spray nozzles 51 and 52 provided in the spray adapter 50 in the symmetrical direction, the supply amount of the repair material sprayed through the spray nozzle 52 increases, and the spraying of the right and left sides is performed. When the nozzle body 2 is rebounded to the other side while the pressures are different from each other, the control plate 55 is inclined with respect to the center line of the refilling inlet line 53a so that the amount of refilling material supplied to the other spray nozzle 51 is increased. Rotate).

According to the present invention having the configuration as described above, by equipping the spray nozzle with a left-right symmetrical structure and spraying the repair material to the furnace wall at the same injection pressure left and right, and maintaining the interval between the nozzle spray and the furnace wall, the nozzle body during maintenance work It prevents shaking and minimizes the amount of rebound loss accumulated in the sealing material after dropping to the lower part after the spraying, so that the construction surface spraying the repairing material on the furnace wall can be formed flat, and the construction quality of the overall repairing material can be improved. It is.

In addition, as compared with the conventional spraying the repair material in one direction, the work time is significantly shortened to increase the work productivity and reduce the occurrence of the rebound loss, so that the smooth operation can be increased after the operation restarts.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (5)

It is connected to the wire rope 14 of the manipulator (1) to enter the blast furnace 10 to be moved in and out, and the nozzle body is supplied to the repair material through a supply hose (7a) connected to the feed gun (7) 2), the apparatus for injecting a repair material to the inner wall of the blast furnace 10, On the lower surface of the nozzle body 2, the injection adapter 50 in which a plurality of repair outlet ports 51a, 52a are arranged symmetrically with respect to the repair outlet port 53a communicating with the supply hose 7a. The spray nozzles 51 and 52 are provided in the repair refilling line 51a and 51b to spray the repairing material supplied through the repair refilling line 53a at the same injection pressure to the inner wall of the blast furnace 10. Furnace wall repair material injector, characterized in that each replaceable assembly. The method of claim 1, The spray nozzles 51 and 52 respectively form a male screw portion screwed to the female screw portion formed on the inner circumferential surface of the repair outlet port 51a and 52a at the rear end thereof, while maintaining the same distance as the inner wall of the blast furnace 10. Blast furnace wall repair material injector, characterized in that consisting of a hollow pipe member having the same inner diameter size and length so as to spray the supplied repair material at the same injection pressure. The method of claim 1, The control plate 55 which is disposed between the water refilling outlet lines 51a and 52a in the internal flow path of the injection adapter 50 and is operated so as to adjust the supply amount of the water retaining material which is divided into the spray nozzles 51 and 52. Furnace wall repair material injection device characterized in that the configuration. The method of claim 1, The injection adapter 50 has a distribution side 56 formed on the top of the inclined surface 56a of the mountain-shaped cross section so as to change the repairing material flow path supplied through the repairing inlet line 53a by 90 ° at both ends. Furnace wall repair material injector characterized in that. The method of claim 4, wherein The inclined surface 56a is a blast furnace wall repair material injection device, characterized in that formed in an arc shape so as to minimize the frictional resistance of the repair material distributed to the left and right ends.