JPS649557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to vertical or inclined processing furnaces used in the steel industry, such as blast furnaces, electric furnaces, special refining furnaces, ladle or lime shaft furnaces, etc., which are tall and have a circular inner wall cross section. This invention relates to equipment for spraying repair of lining walls of refractories that have been refracted, particularly equipment that sprays repair material for monolithic refractories onto the inner walls of furnaces in a hot state without completely shutting down or cooling the furnace. It is.

As is well known, the lining refractories of the above-mentioned various types of furnaces are locally damaged or fallen off during the later stages of operation or after multiple uses, so partial repairs (also called intermediate repairs) of the furnace inner walls are carried out in order to extend their service life. ) is being carried out.

Traditionally, repairs to the inner wall of a furnace can be broadly divided into two types: those that involve a worker entering the furnace after the furnace has completely stopped operating or being used, and waiting for it to cool down, and those that involve repairing the furnace while it is in operation or temporarily suspended. There are two methods: one done from outside.

In the former case, after the charge in the furnace is discharged outside the furnace and the furnace body is cooled, a worker enters the furnace and collects the repair materials.
Equipment, etc. are brought in, the furnace is constructed and refractories are sprayed, the refractories are dried, and the temperature inside the furnace is raised before restarting operations, which simply takes a long time from shutdown to normal operation. Moreover, the heat loss during this process is large, and the poor working environment poses problems for maintaining the health and safety of workers.

On the other hand, the latter repair method, which is performed hot from outside the furnace, has the advantage of being able to perform repairs without completely stopping the operation and use of the furnace, but on the other hand, the height of the furnace is high, especially in blast furnaces where only the shaft part is 20 m high and the diameter is If the length is more than 10 meters, when repairing the furnace, make many incisions in the steel shell and furnace wall, install large manholes for work, insert the spray nozzle of the repair material through these openings, and spray manually. Repair work is being carried out. This is because the range that can be sprayed at one location is limited, which is not preferable in terms of maintaining the strength of the furnace body. In addition, there is a lot of rebound loss of the sprayed repair material due to construction constraints, and there is also a lack of accuracy in determining the repair location and construction details, resulting in a lack of spraying accuracy and construction reliability, so much can not be expected to extend the life of the furnace wall.

In addition, it requires a large number of workers, and the productivity of spraying work is low at about 2 tons per man-hour.Furthermore, it is necessary to install work decks around the furnace body, open and close large manholes, and install long spray nozzles in the furnace. It has many drawbacks, such as requiring complicated work such as insertion and removal into the interior, and in addition, it involves high-temperature, heavy-duty work, which poses health and safety problems for workers.

Another method is to make a small opening from the outside of the furnace at the part of the furnace wall that is believed to be damaged, insert a press-in nozzle through this narrow opening, press-fit the monolithic refractory press-in material with a predetermined viscosity, and dry and solidify it. Although repairs are being carried out, it is difficult to accurately assess the location and status of damage to the furnace wall from outside the furnace, resulting in the problem that lathing cannot be done effectively.

As mentioned above, although there are many drawbacks to repairing the inner walls of tall furnaces such as blast furnaces, the current situation is that no effective repair method, repair device, or automatic repair device has been developed to solve these problems. .

This invention solves the various drawbacks of the conventional method, and
Repair work that can be carried out by a small number of people without opening new manholes, while accurately understanding the damage location, damage status, and repair work status, especially in hot conditions, on the inner walls of tall furnaces. The purpose is to provide equipment.

This invention holds the boom horizontally on a working deck near the upper opening of the furnace to be repaired, that is, in the case of a blast furnace, a working deck with a movable armor manhole; A traveling device is installed, and by using the traveling device to move the boom horizontally toward the center of the furnace, the tip of the boom is extended to the center of the furnace axis, and four wire ropes are attached near the tip of the boom. The repair material spraying device is attached to a hanging repair material spraying device, and the repair material spraying device can be vertically raised and lowered within the furnace by expanding and contracting the four wire ropes connected to a drive device outside the furnace via a wire sheep. Therefore, the repair material spraying device consists of a horizontally extending spray nozzle, a nozzle rotation device that allows the spray nozzle to rotate freely, and a cooling box that houses a television camera, a radiation thermometer, and a lighting lamp. Furthermore, the above-mentioned spray nozzle is connected to a repair material supply device installed outside the furnace and a water pump via an expandable pressure hose, and furthermore, the refractory spraying repair work during furnace repair is controlled. This is a furnace inner wall spray repair device characterized by being equipped with an automatic control device that operates the furnace.

The present invention will be described in detail below based on embodiments shown in the drawings. Fig. 1 is a side view of the repair device of the present invention, and Fig. 2 is a plan view. 3 motors with brakes, 4 reducers, 1 pair each on the front and rear, total 4
Four boom traveling rollers 5, four insertion rollers 6, and four side rollers 7 are provided, and the movable boom 1 can be moved to any horizontal position and stopped. 8 is mobile boom 1
A furnace repair material spraying device (hereinafter simply referred to as "spraying device") is suspended by four wire ropes 9 near the tip of the furnace, and the four wire ropes 9 are raised and lowered through four sets of wire sheaves 10, front, rear, left and right drum 11
The spray device 8 extends vertically and can be expanded and contracted by the operation of the lifting motor 12, so that the spraying device 8 can be moved up and down in the vertical direction. Further, since the four corners of the spraying device are suspended by four wire ropes 9 and the center of gravity is adjusted by a balance weight 13, the spraying device does not sway or tilt when moving up and down.

As shown in the figure, the spraying device 8 comprises a spraying nozzle 14, a nozzle rotating device 15 , a cooling can 16, and a connecting portion between the repair material and a hose 17 for pumping the added water.

FIG. 3 is a side view showing the internal structure of the spraying device 8 , where 14 is a spraying nozzle, and the spraying device mount 18 is a side view showing the internal structure of the spraying device 8.
It is attached to and connected to a material and water pressure feeding hose 17, and can be extended as shown in FIG. 4-a to FIG. 4-b by sliding parts A and B shown in the figure, For example, it can be expanded or contracted to any length from 4m to 7m. As a result, even when the inner diameter of the furnace changes depending on the height level, such as in a blast furnace, the distance to the inner wall of the furnace, that is, the spraying distance can be kept constant, so optimal spraying work can be achieved.

Next, the operation of the nozzle rotating device 15 will be described. First, the drive of the motor 19 is transmitted to the gear 22 through the reducers 20 and 21, and the drive shaft 23 rotates, thereby causing the spray nozzle 14 to rotate around the axis. That is, since the frame 18 of the spraying device rotates around the pressure feed hose 17, the spray nozzle 1
The tip of 4 revolves around a circular orbit.

Inside the cooling box 16, there is a television camera 24 that shows the construction status and a radiation thermometer 25 that measures the temperature of the wall surface.
is stored, and the outer grain is stored in a water cooling pipe 26,
It is circulated and cooled by the air cooling pipe 26', and the inside thereof is a cooling box cooled by the air from the air cooling pipe 27. In addition, 500W is installed on both sides of the cooling box 16.
A floodlight 28 (shown in FIG. 2) is fixed to illuminate the sprayed surface. The side surfaces of the cooling device 15 are protected by a heat insulating material 29, and the front window of the cooling box 16 is protected by a quartz glass 30.

Next, we will explain the state in which the repair equipment was installed to repair the inner wall of the blast furnace and the repair work.
In the figure, 31 is the outer shell of the blast furnace, 32 is the inner wall of the shaft part lined with refractory material, 33 is the damaged part of the inner wall, 34 is the movable armor manhole, and 35 is the work deck, which is a diagram showing the charge inside the blast furnace. The upper row shows the raw material level during operation, the middle row shows the reduced-scale operation raw material level during shaft upper spraying, and the lower row shows the reduced-scale operation raw material level during shaft section spraying.

In order to charge the spraying device 8 into the furnace after reducing the blast furnace material to a predetermined level, the spraying device 8 is stored in the movable boom 1, and the boom traveling device 2 is moved to a suitable separate position. Movable armor manhole 34
After moving and fixing the boom 1 onto the work deck 35 near the front of the furnace, the traveling motor 3 is activated to extend the boom 1 into the furnace. At this time, the spraying device 8 can be passed through the manhole 34 by being inserted into the boom 1 in a close contact state.

Next, by controlling the traveling of the boom by a detector attached to the boom traveling device, the spraying device can be accurately positioned at the center of the furnace axis as shown in the figure.

Wire rope 9 suspending the spraying device 8
is connected to the lifting drum 11 via the wire sheave 10, so by operating and adjusting the lifting motor 12, the spraying device 8 can be lowered to a predetermined level of the inner wall repair required position and stopped.

As mentioned above, the spray nozzle 14 is rotatably and extendably attached to the spray equipment, so when charging, the tip of the spray nozzle facing the direction of boom movement should be leveled to the angle of the wall requiring repair. The spray nozzle can be extended and fixed in position so that the distance to the repaired wall becomes a predetermined spray distance.

The material and water pressure feeding hose 17 connected to the spraying device is connected to a hose guide 36 and a hose winding device 3.
7 to a repair material supply device 38 and an added water pump 39, and the hose of a compressor 40 is connected to the material supply device, and its drive provides the mixing and spraying pressure necessary for spraying construction. Then, the repair material is ejected from the spray nozzle 14.

When the tip of the spray nozzle is fixed at a predetermined spraying position, a predetermined blend of monolithic refractories (repair material) is put into the repair material hopper 41 and spraying starts. Spraying can be carried out in hot conditions where the blast furnace atmosphere temperature and the furnace wall surface temperature are 300 to 600°C, and the spraying method first limits the time that can complete the first layer spraying within a predetermined time. The furnace wall is divided into unit spraying areas. (to block). Block formation is determined by giving the rotation angle and lifting span of the spray nozzle.

When spraying one block, layered spraying is performed by repeatedly swinging the spray nozzle at a predetermined angle and moving it up and down. (Setting the spray pattern). The spray pattern is set by providing the spray nozzle rotation speed, rotation angle, lifting speed, lifting pitch, lifting span, return speed to the initial spray starting position and the number of spray layers.

After completing one construction block, the work is sequentially moved to the adjacent construction block. During this time, the degree of damage to the repaired wall and the spraying status of the repair material are monitored using a television camera, while the moving speed of the spray nozzle and the spraying pressure are monitored. Adjust the added water while monitoring the wall temperature using a radiation thermometer.

When spraying the lower part of the shaft in a reduced-scale operation when the level of the material in the reactor is at the position shown in the lower part of Figure 5, the spraying device 8 is lowered to the position shown in the lower part of Figure 5, so that no suspension is required. The lowering length is approximately 18~
However, as mentioned above, the four hanging wire ropes 9 are suspended in a well-balanced manner, so that the spraying device 8 does not tilt or sway during movement or during construction, and also prevents the spraying material from spewing out. Since the reaction force is very small, there is no possibility of the spraying device backing up due to its own weight alone. Therefore, the direction and tip position of the spray nozzle can always be controlled to a predetermined operating position. Reference numeral 42 shown in FIG. 5 is an automatic control operation device that controls and operates the above-mentioned operations.

As explained above, the extension of the boom, fixation of the vertical position and vertical movement of the spraying device, rotation angle and rotation speed of the spray nozzle, number of sprays (spraying thickness), supply of repair material and its pressure, and added water. By determining the adjustment, etc. of the wall to be repaired based on the construction zone and construction order of the wall to be repaired, the degree of damage, the furnace wall temperature, etc., it is possible to set a pattern for the construction work method and automatically operate almost all the work. .

When the spraying repair of the furnace inner wall is completed in this way, the spraying nozzle is retracted, the spraying device lifts it up, and it comes into close contact with the boom.The boom traveling device is driven circularly to move the boom back out of the furnace, and if necessary, Trade the boom travel gear through the manhole to complete the entire task.

Since the repair device of the present invention has the structure and operation as described above, it has the following effects in repair work.

1. Hot spraying repairs can be carried out without shutting down the furnace, so normal operations can be returned to normal operations in a short time after repairs.

2. Can be constructed using only existing openings, and there is no need to modify existing equipment.

3. The entire device is compact and can be set up in a short time.

4. As it is possible to accurately grasp the spraying situation, fix the nozzle position, detect movement and wall surface temperature, and adjust the operation of the spray nozzle, spraying can be carried out under optimal conditions.

5. A wide range of areas from the upper part to the lower part of a large furnace can be constructed continuously in a short time.

6 Construction patterns can be set in advance and construction can be carried out automatically.

7. The number of workers can be drastically reduced.

8. Optimal construction can be carried out by accurately responding to the slope profile of the inner wall.

9. The working environment is good and safe.

Although the above explanation was mainly about construction in a blast furnace, this repair device can be applied to spraying on the inner walls of tall circular furnaces and containers other than blast furnaces, and the same effect can be achieved. be able to.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the invention, Fig. 2 is a side view showing an embodiment of the present invention;
FIG. 3 is a side view showing the inside of the spraying device, FIG. 4 is an explanatory diagram showing the expansion and contraction of the spray nozzle, and FIG. 5 shows how the repair device according to the present invention is used in a blast furnace. FIG. 1...Movable boom, 2 ...Boom traveling device, 3
...Boom traveling motor, 8 ...Repair material spraying device, 9...Hanging wire rope, 10...Wire sheep, 11...Elevating drum, 12...Elevating motor, 14...Spraying nozzle, 15 ... Nozzle rotation device, 16... Cooling box, 17... Pressure feeding hose, 24... Television camera, 25... Radiation thermometer, 35... Work deck, 38... Repair material supply device, 39... Additive water pump, 40... Compressor, 41... Repair material hopper, 42...
Automatic control operating device.

Claims (1)

[Scope of Claims] 1. A device for repairing vertical or inclined refractory lining walls of a cylindrical furnace by spraying monolithic refractories in a hot state, comprising: a device installed on a working deck at the top of the furnace and movable horizontally; A boom traveling device is connected to the boom traveling device, and four wire ropes are connected to the tip of the mobile boom, which is held by the boom traveling device and extends almost horizontally toward the inside of the furnace, via a drive device outside the furnace and a wire sheave. A furnace repair material spraying device that can be raised and lowered is suspended.
The furnace repair material spraying device includes a horizontally extending spray nozzle, a nozzle rotation device that allows the spray nozzle to rotate freely, and a cooling box that stores a television camera and a radiation thermometer. is connected to a repair material supply device and a water pump provided outside the furnace via an expandable pressure hose, and further includes an automatic control device for controlling and operating the refractory spraying repair work during the furnace repair. A furnace inner wall spray repair device characterized by: