JPS609807A - Swiveling type sprayer for inside wall of blast furnace - Google Patents

Abstract

PURPOSE:To repair the inside wall of a blast furnace while hot with a small number of operators without requiring new installation of a manhole by suspending a repair material sprayer via a lifting device to a device which travels on a circular track provided to the circumferential edge in the lower part of the large bell positioned in the upper part of the blast furnace. CONSTITUTION:A repair device consisting of an assembly of a traveling device 6, a lifting winch 7, a wire rope 8 and a sprayer 9 is mounted on a self-traveling type lifter 4 and is moved upward so as to be inserted through a manhole 2 of a blast furnace under the operation for reducing the stock level to the inside of the furnace. The insertion part is supported by a supporting chain 12 extending through an auxiliary manhole. The operator rides on the lifter 4 and while moving upward the lifter, the operator inserts the device 6 to a circular track 5, puts a cover on the connecting part, descends the lifter and retreats the same to the outside of the furnace. The device 9 is then descended down to the upper limit position of the wall to be repaired by a remote operation and a nozzle is extended or contracted or is adjusted preliminarily to a required length so that the distance between the tip of the spraying nozzle and the inside wall 1 attains a prescribed value. A force feeder for the repair material to be sprayed and water is then operated and at the same time the air motor of the device 6 is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device used for repairing blast furnace lining refractories, and in particular spraying of monolithic refractories in hot conditions during reduced scale operations without completely shutting down or cooling the blast furnace. The present invention relates to a device for repairing the inner wall of a furnace by spraying a repair material on the upper and lower parts of a shaft.

As is well known, the refractory lining of a blast furnace wears out or falls off during its operation, so intermediate repairs are carried out at appropriate intervals to extend its service life.

Conventional methods of repairing the inner wall of a furnace can be roughly divided into two types: those that require a complete shutdown of the operation (1), those that require workers to enter the furnace to cool down, and those that involve temporary suspension of operation during operation and those that are performed from outside the furnace. There are three ways to do it.

In the former case, the charge inside the furnace is discharged outside the furnace, the furnace body is allowed to cool down, and then a worker enters the furnace to repair the material.

We brought in the equipment and carried out the construction of the furnace and the spraying of refractories.
Restarting operations is started after drying the refractories and raising the temperature inside the furnace. Not only does it take a long time from shutdown to normal operation, but the heat loss during that time is also large, and the working environment is poor, making it difficult for workers. There are also health and safety issues.

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 of the furnace, but on the other hand, like a blast furnace, the shaft alone can reach a height of over 20 m and a diameter of 10-odd meters. In such cases, when performing repairs, the steel shell of the furnace body and the furnace wall must be cut in multiple places to install large manholes for work, and the repair material can be sprayed through these openings by inserting a nozzle and performing the repair work manually. There is. This is because the range that can be sprayed at one location is limited, which is not good 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, and spraying lacks precision and construction reliability, so much can not be expected to extend the life of the furnace wall. In addition, spraying requires a large number of workers, and the productivity of the work is low at about 2 tons per man-hour.In addition, it is necessary to install work decks around the furnace, open and close large manholes, etc.
Spraying over a long length requires complicated work such as inserting and removing the nozzle into the furnace, and it also has many drawbacks, such as high-temperature, heavy-duty work that 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. Repairs are being carried out, but the damaged location of the furnace wall,
Since it is difficult to accurately assess the damage situation from outside the furnace, there is a problem in that the construction work cannot be carried out effectively.

As mentioned above, although there have been many drawbacks in repairing the inner walls of blast furnaces, currently no repair method or repair device has been developed to solve these problems.

This invention solves the various drawbacks of the conventional method, and uses an internal spraying method that allows repair of the inner wall of the blast furnace by hot spraying, with a small number of workers, and without opening new manholes. The purpose is to provide repair equipment.

This inventive device has a μ line device that runs on a circular track attached to the lower part of the large bell at the top of the blast furnace, and a lifting winch is connected below it, and the spray nozzle is connected to the lifting winch. In the spraying system, the device is suspended by a wire, and as the traveling device moves, the nozzle orbits near the inner wall. It is also characterized in that the material pressure feed hose, pressurized water hose, and power cable, which are essential for the work, are connected to the spray nozzle. That is, in the case of spraying suspended in the furnace, the nozzle orbits near the furnace wall.

The present invention will be explained based on drawings showing embodiments thereof. Fig. 1 is a front view showing the repair device immediately after being installed in the blast furnace, and Fig. 2 is a front view showing the spraying operation state. In the figure, 1 is the refractory lining inner wall of the blast furnace, 2 is the movable armor manhole, 6 is the upper working deck, and 4 is a self-propelled lifter installed on the working deck. This is a device for charging into the interior. Reference numeral 5 denotes a circular rail attached to the lower periphery of the large bell, which is permanently installed since the temperature is at a maximum of around 300°C during operation of the blast furnace. 6 is a traveling device that runs on a circular track and is driven by an air motor. Reference numeral 7 denotes an elevating winch (elevating device) attached to the lower part of the traveling device B, which suspends the repair material spraying device 9 with a wire rope 8 and raises and lowers it. The number of wire ropes may be one or two.The wire rope 10 may have a telescopic structure so that the distance from the inner wall of the furnace can be adjusted using a nozzle attached to the lower part of the spraying device. Reference numeral 11 denotes a bundle of a repair material pressure feeding hose, a pressurized water hose, and a power cable connected to the spraying device 9, and is coated with a heat-resistant coating so as to withstand the temperature of 400 to 500° C. inside the furnace.

Note that the 12 beams are support chains that support the lid 4.

6 and 4 are a side view and a front view showing details of another embodiment of the spray repair device. 13 is an air motor that drives the traveling device 6 on the rail 5;
．． 15 is a gear and roller connected to the air motor. Reference numeral 16 denotes an air motor for driving the lifting winch 7, and for spraying the repair material, the pulley 17 for hoisting up and lowering the device 9 one time with the wire rope 8 is rotated once.

Therefore, during spraying, the air motor 13 drives the device 9 to keep a predetermined distance from the furnace inner wall, and the device 9 rotates around the furnace and stops at any desired position (1-). In addition, if the nozzle 10 is made expandable and retractable by a telescopic device (not shown) operated by a motor, the spray can be stopped at the tip of the nozzle and the furnace inner wall in response to changes in the diameter of the inner wall. Since the relationship between the vertical position in the beating furnace and the furnace diameter is unique to the furnace, spraying is performed by the vertical position detection function of the nozzle 10, and spraying is determined by the vertical position detection function of the nozzle 10. By linking the expansion and contraction functions, the spray nozzle can be maintained at a certain distance from the inner wall during work.It is also possible to maintain long and short spraying by changing the nozzle at any time.

5 and 6 are a side view and a front view showing details of the self-propelled lid 4 shown in FIG. 1.

In the figure, 18 is a link mechanism, and rails 19. wheel 20
．． It is self-propelled by a motor 21 that rotates an axle, and a spray device 9 is mounted on the upper frame, which is raised by a power cylinder 22 and installed on the rail. Note that 2 is a balance weight, and 10 is a spray nozzle.

Next, the charging of the spray repair equipment into the blast furnace and the spray repair work described above will be explained.

In order to install repair equipment in a blast furnace that has been operated at a reduced scale, the first
As shown in the figure, the traveling device 6. Lifting winch 7, wire rope 8. For spraying, a repair device including the device 9 is mounted on a self-propelled lifter 4, raised to the level of the manhole 2, inserted into the furnace through the manhole, and the inserted part is supported by a support chain 12 from the auxiliary manhole. The worker gets on the deck at the top of the beam, raises the lifter, inserts the traveling device 6 into the circular rail 5, and covers the connection part, then lowers the lifter and retreats out of the furnace.

Next, the spraying is carried out by remote control as shown in FIG.
is lowered to the upper limit position of the wall requiring repair, and spraying is continued until the distance between the nozzle tip and the inner wall 1 is at a predetermined interval (usually 1.0 to 1
．． 5 m) using the expansion and contraction device of the spray nozzle. Alternatively, attach a spray nozzle of the required length in advance. As mentioned above, the spraying can be automatically adjusted from the top and bottom positions of the device. Next, for spraying, the repair material and water pressure feeding device is operated, and at the same time, the air motor 13 of the traveling device B is driven, and the spraying device sprays the repair material onto the inner wall while rotating 360 degrees.

At this time, it is possible to spray two to several layers in a laminated manner by temporarily stopping the traveling and repeating the reverse and forward movement for particularly deeply damaged furnace wall parts.

When the spraying of the highest level is completed, the spraying device is lowered to a predetermined lowering level (usually 1 to 1.5 m) and the same operation is repeated until the lower limit of the wall requiring repair is reached.

In FIG. 2, A shows the spraying situation at the upper part of the shaft with a smaller diameter inside the furnace, and B shows the spraying situation at the lower part of the shaft with a larger diameter, and it can be seen that the lengths of the spray nozzles 10 are different. Spraying can be done by adding a telescoping mechanism as mentioned above to expand and contract the nozzle.
Since the spray gun of t wears out with use, it must be replaced every one or two rounds of construction. Therefore, by replacing the nozzle with a longer spray nozzle in sequence according to the slope profile of the inner wall, in many cases the expansion and contraction mechanism of the spray nozzle can be omitted.

To replace the nozzle, a worker raises the device to the top with a winch and inserts a lifter into the furnace.

In this manner, when all the damaged parts of the inner wall have been repaired to the predetermined lowest limit, the sprayer raises the mounting w9 to the top and takes it out of the furnace and collects it by performing the reverse operation of the loading operation.

For spraying, the equipment 9 can be made heat resistant and can be equipped with a television camera for monitoring work, a floodlight for illuminating the furnace wall, and a thermometer for measuring the temperature inside the furnace and on the furnace walls. It is possible to carry out more accurate repair work by making detailed adjustments.

As explained above, the repair device of the present invention can perform hot spraying without cooling the inside of the furnace and by remote installation outside the furnace, so the furnace can be returned to normal operation in a short time after repair. This improves the operating efficiency of the furnace, saves energy, and is also environmentally friendly for repair work. In addition, no special equipment is required on the blast furnace side for use, and the furnace body will not be damaged. Furthermore, due to its structure, spraying does not require a nozzle rotation mechanism inside the device, and the device is as simple as inserting it through a manhole, and the vertical position of the sprayer and the distance to the repair wall can be adjusted accurately. Since it can accommodate the sloped profile of the furnace body, it allows for highly reliable construction and extends the life of the repaired wall.

Furthermore, it is easy to automate, and since the awn spraying device can be equipped with a monitoring television, thermometer, etc., it is a repair device that allows for highly accurate repairs.

[Brief explanation of the drawing]

1 and 2 are front views showing an embodiment of the present invention and how it is used, FIGS. 6 and 4 are side views and front views showing another embodiment of the repair device, and FIGS. FIG. 6 is a side view and a front view of an example of a lid used for charging the repair device of the present invention into a furnace. 1... Refractory lining inner wall, 2... Manhole, 4...
... Self-propelled lifter, 5 ... Circular rail, 6 ... Writing device, 7 ... Lifting winch, 8 ... Hanging wire rope, 9 ... Repair material spraying device, 10 ...Nozzle for spraying, 11...Repair material and water pressure feed hose and power cable. Representative Patent Attorney Sanro Kimura

Claims (1)

[Claims] A traveling device that runs on a rail installed in a circle around the lower part of the large bell at the top of the blast furnace, a repair material spraying device suspended from the traveling device with a wire rope via an elevating device, and a repair material spraying device 1. A rotating blast furnace inner wall blowing repair device, comprising a spray nozzle attached to the spray nozzle, and a repair material pressure feeding hose, a pressurized water hose, and a power cable are connected to the spray nozzle.