JPS6350631B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a refractory lining for processing furnaces such as blast furnaces, electric furnaces, special smelting furnaces, ladle or lime shaft furnaces, etc., which are tall and have a circular cross section of the inner wall used in the steel industry. The present invention relates to a device for spraying repair of damaged parts, and particularly to a device for repairing a furnace wall by spraying monolithic refractories in a hot state without completely shutting down or cooling the furnace.

As is well known, the refractory lining of the various types of furnaces mentioned above is locally worn out or falls off during the later stages of operation or after multiple uses, so partial repair (also called intermediate repair) of the inner wall of the furnace is required to extend its service life. It's being done.

Conventionally, repairs to the inner wall of a furnace can be roughly divided into two types: one is to completely stop operation or use, wait for it to cool down, and then enter the furnace by a worker, and the other is to repair it from outside the furnace during operation or during a temporary suspension of operation. There are two methods:

In the former case, after discharging the charges inside the furnace and waiting for the furnace body to cool, a worker enters the furnace and picks up the repair materials.
The equipment is brought in, the furnace is constructed, the refractories are sprayed, the refractories are dried, and the temperature inside the furnace is raised before restarting operations, so it only 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 for blast furnaces where only the shaft part has a height of 20 m and a diameter. 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, the work deck equipment around the furnace body, the opening and closing of large manholes, and the long spray nozzle inside the furnace. It has many disadvantages, such as requiring complicated work such as insertion and removal from the machine, 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 wall at the likely damaged area, 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 the work cannot be done effectively.

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

This invention solves the various drawbacks of the conventional method, and
A hanging type that allows a small number of people to carry out repair work on the inner wall of a tall furnace, especially in hot conditions, while accurately ascertaining the location and condition of damage and the status of repair work, without opening new manholes. The purpose is to provide repair equipment for.

The repair device of the present invention is installed on a working deck near the upper opening of the furnace to be repaired, that is, in the case of a blast furnace, the working deck is located in a movable armor manhole, and in the case of a ladle, it is installed on the working deck in contact with the upper opening provided in a pot repair shop. This is a device that sprays monolithic refractories for repair onto damaged areas of the furnace wall by inserting a spraying machine into the furnace and suspending it, and using the vertical movement of the spraying machine and horizontal rotation of the spray nozzle. , the gist of which is an arm traversing device that extends a cantilever arm almost horizontally into the furnace, a spraying machine, a trolley equipped with a cylinder that stores the spraying machine horizontally and tilts it inside the furnace, A trolley traveling device for running a trolley on the arm, a lifting winch for suspending and raising and lowering the spray machine, and a rotatable spray nozzle for the spray machine, and a material hose, a water hose, This is a furnace wall spray repair device characterized by connecting an air hose and an electric cord.

The present invention will be described below based on the embodiments shown in the drawings. Fig. 1 is a side view showing the state in which the repair device is installed, in which 1 is a refractory-lined furnace wall of a kiln to be repaired, and 2 is an upper part of the kiln. manhole or opening, 3 is the upper working deck, 4 is the upper working deck 3
Cantilever arm 5 with arm traverse device installed above
This is a device that holds the metal movably outside the furnace, extends it almost horizontally into the furnace, and then retreats it out of the furnace. Therefore, a traverse motor, a speed reducer, a traverse roller, a pushing roller, a side roller, a movement position display meter, etc. are built in to move the arm to any horizontal position and stop it. (These are not shown).

Figure 1 shows the state in which the tip of the cantilever arm 5 is extended to the side of the central axis of the furnace, 6 is a trolley that runs on the cantilever arm 5, and the trolley traveling device 7
The trolley reciprocates on the cantilever arm by being connected to a running wire 8, which is moved by the trolley, but the trolley may also be an electric trolley. Inside the trolley 6, a spraying machine main body 9 is stored horizontally when it is outside the furnace. When the trolley is moved into the furnace, as shown in FIG.
The lower part of the spraying machine main body 9 is brought close to the opening 2 by tilting the sprayer main body 9 at a close distance.

The reason for the above configuration is as follows. In other words, the opening area of the upper manhole of a kiln is usually very narrow.For example, the movable armor hole of a blast furnace is only about 1.300 mm in height, so it is difficult to insert a spraying machine with a height higher than that into the furnace while standing upright. Also, the spray nozzle 1 shown in FIG.
1 to the lower part of the spraying machine body 9 or replacing it is easiest when the spraying machine body is tilted approximately 20 degrees as shown in FIG. The spray nozzle is worn out by spraying, so the spray amount should be 20~
It is necessary to replace it with a new one every 30 tons.

The spraying machine main body 9 was gradually raised vertically from the state shown in Fig. 2, while the trolley 6 was moved and stopped at the axial center position in the furnace. (not shown) and detach. The spraying machine main body 9 is suspended by a lifting wire 12 as shown in FIG. It can be raised and lowered freely. Further, connected to the upper part of the spraying machine body 9 are a repair material pressure feeding device 14, a water pump 15, a compressor 16, and a pressure feeding hose 17 that includes a material pressure feeding hose, a pressurized water hose, a compressed air hose, and an electric cable. .

The spraying machine main body 9 is lowered by a lifting winch 13 to the position of a repair-required area 18 on the furnace wall, and the spraying nozzle 11 is rotated in the repair direction to eject a predetermined spraying repair material. The spray distance to the furnace wall (distance from the tip of the spray nozzle to the inner wall) is 1.5~
Since the best adhesion rate is obtained at 2.0 m, the spray distance can be maintained by selecting the length when replacing the spray nozzle. Note that 19 is a cooling box that houses the attached equipment of the spraying machine.

Next, the structure of the main body of the spraying machine will be explained.

FIG. 4 is an explanatory side view showing an example of the main body of the spraying machine in the repair apparatus of the present invention. In the figure, reference numeral 20 denotes a spray nozzle attachment part, which is directly connected to a rotation shaft 21, which is connected to an air motor 22, chain sprockets 23, 23',
The mechanism of swivel joint 24 and bearing 25 allows it to rotate freely 360 degrees. Therefore, the tip of the spray nozzle can perform reciprocating swing motion at a predetermined angle in a horizontal position with respect to the furnace wall. The above rotating device is housed in a box protected by heat-resistant material.

A material pressure feed hose 26 for press-fitting repair material into the hollow application shaft, and cables 27 for pressurized water, compressed air, and electricity are connected to the upper part of the spraying machine body, and the pressurized water is connected to a water ring 28. It is mixed with the repair material and supplied to the cooling chamber 19 for water cooling. Compressed air is also used to drive the air motor 22.

The electric cord is the power source for the air motor and the television camera, illumination light, or radiation thermometer attached to the bottom of the spray machine body, which will be described later.
Further, each of the hoses and cables mentioned above is coated with a heat-resistant material so as to withstand the high temperature inside the furnace.
The water added to the material can be adjusted using solenoid valve 2.
9. As mentioned above, the spray nozzle is attached to the lower part of the spray machine body so as to be freely rotatable.

Additionally, there is a lighting lamp 30 that illuminates the repaired wall surface, a television camera 31 that monitors the repair status, and a radiation thermometer 32 that measures the furnace wall temperature to adjust the spraying conditions.
A cooling box 19 containing a cooling box 19 is installed under the spray nozzle so as to operate simultaneously with the spray nozzle.

The main body 9 of the spraying machine is suspended in the furnace by a lifting wire 12 as shown in Fig. 3, and the upper part of the main body of the spraying machine is suspended by three to four wires, which are held together. It is necessary to connect it to the lifting wire 12 by using the lifting wire 12.

Next, the spraying repair work using the above-mentioned spraying device will be explained using the case of a blast furnace as an example.

As shown in Figs. 1 and 2, the main body 9 of the spraying machine is passed sideways through the movalve armor hole 2 by the trolley traveling device into the furnace which is being operated at a reduced scale and is temporarily in a state of rest. Stop cylinder 10
Activate the button, rotate it vertically, and then move the bottom part about 20 degrees.
tilt it towards the furnace wall. At this position, the spray nozzle 11 is attached to the lower part of the spray machine body. Next, the spraying machine main body is further moved into the furnace and stopped at the central axis position of the furnace, and the spraying machine main body lifting winch 13
is activated to lower the spraying machine body to a predetermined level and then stop.

At this time, the trolley's traverse speed is 1 to 3 m/min.
The lifting speed is 6 to 9 m/min, and the nozzle installation is 2
It is possible within minutes. Therefore, from the time the device starts operating until it is fixed in place in the lower part of the furnace,
Complete within 10 minutes.

Next, the repair material pressure feeding device 14 and the air motor 2
2, the pressurized water pump 15 and the air compressor 16 are operated, and the repair material is sprayed out while the spray nozzle 11 is horizontally reciprocated to carry out spraying work.

Note that during work, cooling water is circulated outside and cooling air is circulated inside the cooling canister 19 at the bottom of the spraying machine main body, so work can be carried out without any problem even when the furnace atmosphere temperature is 400 to 500°C. Also, while working, there are 3 TV cameras.
1, and furthermore, the temperature of the furnace wall is measured with a radiation thermometer 32, and manual fine adjustment of the spraying operation is performed.

As explained above, the repair device of the present invention is a heat-resistant spray repair device that is suspended inside the furnace, so it can perform hot work without the need for cooling the furnace. There is no need to install an opening, which is effective in terms of energy saving and protection of the furnace body. In addition, the main body of the spraying machine can be inserted horizontally into the furnace, and it can be tilted near the opening, so it can be used in blast furnaces with narrow openings, for example, and the spraying nozzle can be installed and replaced easily in a short time. can.

Furthermore, the structure allows the spraying speed of the spray nozzle to be adjusted arbitrarily, so it is possible to respond to damage to the furnace wall and perform spraying work under optimal conditions.The spraying status can be monitored on TV and adjustments can be made based on furnace wall temperature measurements. In conjunction with the work, a good repaired wall can be constructed with a high yield, which has the effect of extending the useful life of the furnace. It is also possible to simultaneously improve productivity and maintain the health and safety of workers.

This repair equipment can be used not only for blast furnaces but also for electric furnaces, ladles, etc.
It can also be effectively applied to the spray repair of the lining walls of tall kilns such as lime shaft furnaces, and produces similar effects.

[Brief explanation of the drawing]

Figures 1 to 3 are front views showing an embodiment of the repair device of the present invention and its usage state, with Figure 1 being before the start of spraying work, Figure 2 being the installation of the spray nozzle, and the state in which it is used.
Figure 3 shows various situations of spraying work. FIG. 4 is a side view schematically showing the structure of the spraying machine main body. 1... Lining furnace wall, 2... Manhole, 3...
Upper working deck, 4... Arm traverse device, 5...
Cantilever arm, 6... Trolley, 7... Trolley running device, 8... Trolley running wire, 9... Spraying machine main body, 10... Tilting cylinder, 11...
...Spray nozzle, 12... Lifting wire, 13...
...Elevating winch for spraying machine main body, 17...Pressure hose, 18...Parts requiring repair, 19... Cooling box for storing accessory equipment, 20... Spray nozzle mounting part, 21...
...Air motor, 22...Air motor, 26
...Material pressure feeding hose, 27...Water, air pressure feeding hose, 30...Lighting light, 31...TV camera, 3
2... Radiation thermometer.

Claims (1)

[Claims] 1. A repair device for spraying a vertical or inclined lining furnace wall of a kiln with a monolithic refractory repair material, comprising:
an arm traverse device that extends a cantilever arm almost horizontally into the furnace, a spray machine, a trolley provided with a cylinder that stores the spray machine horizontally and tilts it in the furnace, and a trolley that extends the arm horizontally into the furnace; a trolley traveling device for running on a trolley, a lifting winch for suspending and raising and lowering the spray machine, and a rotatable spray nozzle for the spray machine, and a material hose, a water hose, an air hose, and an electric cord. A furnace inner wall spraying repair device characterized by connecting the two. 2. The furnace inner wall spray repair apparatus according to claim 1, wherein the spray machine is equipped with a television camera, a lighting lamp, and a radiation thermometer.