JPS59119177A - Hot spray repairing device for furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention includes blast furnaces, hot air jets, converters, and special smelting furnaces.

Regarding the hot spraying repair equipment for the refractory lining of processing furnaces used in the steel industry such as degassing furnaces, ladle or lime shaft furnaces, which have a height of 1R and an inner wall with a circular mound surface, it is especially important to completely repair the furnace. Blow-out of monolithic refractories during hot operation is related to equipment for repairing furnace walls.

As is well known, in the later stages of operation of each of the above-mentioned furnaces, due to repeated use, the lining refractories are locally worn out, to the point of falling off. Repairs (also called interim repairs) are being carried out.

Conventional repair methods can be roughly divided into two types: one is to completely stop operation or use and allow workers to enter the furnace while it cools, and the other is to perform it from outside the furnace during operation or by temporarily suspending operation. . In the former case, the charges inside the furnace (ore, molten metal, etc.) are discharged outside the furnace, the furnace body is allowed to cool down, and then workers enter the furnace and carry in repair materials, equipment, etc. to construct the furnace. Alternatively, in refractory spraying, the repair is carried out, and the repaired refractory is dried and the temperature inside the furnace is raised before restarting the operation, which not only takes a long time from shutdown to normal operation, but also increases heat loss during that time ( In addition, there are many problems such as the poor working environment, which has a negative impact on the health and safety of workers.

The latter repair method, which is performed hot from outside the furnace, involves cutting out the steel shell and furnace walls at various locations on the furnace body for furnaces with a total height of io or more, or tens of meters. Manholes are installed and spraying nozzles are inserted through these openings to perform manual spraying repairs, but the area that can be sprayed at one location is limited, so multiple manholes are installed. This is not desirable in terms of the strength of the furnace body. Due to construction constraints, the rebound opening of the sprayed repair material, the number of repair positions,
Repairs lack accuracy, and spraying lacks precision and reliability, so much can be expected to extend the life of the furnace body.

Furthermore, it requires a large number of workers, and the productivity of the spraying work is low at around 5 tons per man-hour.Furthermore, it involves installing a work deck around the furnace body, opening and closing large manholes, and inserting the spray nozzle into and outside the furnace. In addition to the complicated work such as having to take and administering alcoholic beverages, it is also a problem from the health and safety perspective of the workers, who are involved in high-temperature, heavy-muscle work.

In addition, in recent years, a method has been developed in which a small opening is made from outside the furnace in a place that is thought to be a damaged part of the furnace wall, and a nozzle is inserted through this narrow opening to press in a monolithic refractory injection phase of a predetermined viscosity and dry and solidify it. As mentioned above, it is difficult to accurately ascertain the location and status of damage to the furnace wall from outside the furnace. Despite these drawbacks, at present no repair method or repair device has been developed to solve these drawbacks.

This invention solves the above-mentioned drawbacks of the conventional method, and avoids the need to open new manholes (safely The purpose of the present invention is to provide a device that allows accurate repair work to be carried out by a small number of people.

In this invention, an arm equipped with a spray nozzle at the tip is attached to the main body frame, which moves horizontally between the manholes at the top of the furnace body using an auxiliary beam, and this arm is vertically extendable and tiltable. Since the shaft is fixed to the traveling frame, the spray nozzle can be moved circumferentially at any vertical position while maintaining the same distance from the furnace wall (spraying repair where the repair material is pumped out). It is a device.

The present invention will be described below based on embodiments shown in the drawings. Figure 1 is a plan view of this equipment set in a blast furnace.
Figure 2 is also a side view, where 1 is the main body frame of the repair equipment, 2 is a tl auxiliary beam installed parallel to the side of the main body frame 1, and both are connected and connected to opposing manholes in the upper part of the blast furnace. It is set up so that it straddles. Reference numeral 6 is a rotating frame V-frame which is housed in the lower surface of the main body frame, moves horizontally at the same time as the main frame V-frame, and is set at a position where its pivot axis coincides with the blast furnace center axis. Reference numeral 4 denotes an arm pivotally fixed to one end of the rotating frame 6, which can be tilted from the pivot point as a starting point by the extension of the locking wire rope 5, and can be adjusted to any inclination angle. The arm 4 can also be extended or contracted to any desired length by pulling or stretching a wire rope passed through the arm. Reference numeral 6 denotes a spray nozzle attached to the tip of the arm 4, through which the repair material is fed under pressure through a hose 7.

As mentioned above, the auxiliary beam 2 is attached parallel to the side surface of the main body frame 1, so it can be pulled out from the main frame V-frame by the auxiliary beam extraction winch 8, and can be stored without being drawn in by the auxiliary beam storage winch 9. Be it. 10
11 is a winch for attaching the main body frame, and 11 is a winch for storing the main body frame. Both winches are used to guide the main body frame to a predetermined position, that is, the rotating frame 6.
Pull it out to a position where it is on the pivot axis of the blast furnace or the central axis of the blast furnace,
Alternatively, it can be removed or removed from the blast furnace mouth.

Next, 12 is the wire rope 5 that is locked by the tilting winch of the arm 4? Adjust the bevel angle of arm 4 by loosening the wire rope. The length of the arm can be extended or contracted steplessly. 14 is a turning motor for rotating the V-Muro, which has the aforementioned arm 4 pivoted at one end, and is used to rotate the rotating frame. It is connected by a shaft and a chain.

Therefore, adjust the length and angle of inclination of the arm 4, and set the spray nozzle to the spray position (normally, the circumferential wall is repaired in sections every 3 to 10 degrees). Illll of arm 4 to rotate back and forth within the A degree range.
By rotating the part IIIE around a circumference concentric with the furnace inner wall, the spray nozzle 6 rotates back and forth in a predetermined circumferential wall area while maintaining an equal distance from the furnace wall, and then to another circumferential wall area at the same height. By performing the blowing, and further extending and contracting the arm 4 and adjusting the fixing wire lobe 5, the blowing at different heights can be performed in the same manner i'T5.

Note that the distance between the spray nozzle and the furnace wall can be automatically controlled by interlocking the microwave detector and the arm drive mechanism. 15 is a reed gun for pumping the furnace wall repair material (castable refractories), and a repair material pressure feeding hose 7
The repair material is pumped to the spray nozzle B. Reference numeral 16 is a television camera for monitoring the state of damage to the furnace blower, the location requiring repair, and the status of the spraying work.

Since the device of the present invention has the structure as described below, it is possible to easily set the spray nozzle fX' at the optimum position and control the rotation and vertical movement of the top. In addition, if you create a comprehensive schedule for the extension and contraction of the arm, its inclination angle, the rotation of the rotating frame, and the operation of the lead gun based on the furnace repair plan and input it into the automatic control device, the repair work can be done almost completely automatically. Furthermore, even if the diameter or inclination profile of the furnace wall changes during the work, it is possible to continuously carry out repairs and construction using the most suitable spraying technique for the area.

Next, we will explain the five work steps for spraying and repair using this invention apparatus. FIG. 6 is a plan view of the top of the furnace, and FIGS. 4 and 5 are side views.

In Fig. 6, 17 is the furnace wall at the top of the blast furnace, and 18 is a large manhole on the top deck. . .

Set of spray repair equipment ■ First, the opposing large manhole 18. ．． 18 2 lids f9f? The removed main body frame 1 is pulled out to the upper part of the blast furnace using a main body inspection winch 10.

■ Pull out the auxiliary beam 2 with the auxiliary beam drawer winch 8 and connect it to the blast furnace wall? (Fig. 6, Fig. 4)
, body frame 1'? It is further pulled into the furnace using the winch 10 for mounting the main body and the auxiliary beam, and is placed between the furnace walls as shown in FIG. At this time, it will come to the rotation axis of the rotating frame filter or the center of the blast furnace') [-,
.

Setting the blowing nozzle position: ■ 1 Itoichi wire rope 5 with arm tilting winch 12
By extending , the four arms hang vertically l-11
-0 ■ The 13 winches for expanding and retracting the γ-arm are operated 7, and the wire lobes in the arm are extended, and the arm 4 is extended by its own weight as shown in FIG.

(2) Tilt the arm 4 with the arm tilting winch 12, and set the spray nozzle 6 at a predetermined position while controlling the arm 4 with the telescopic winch 13 and the travel motor 14 of the rotating frame.

Spraying work: When the repair material is force-fed to the spray nozzle using the lead gun and hose 7, and the travel motor 14 is activated to rotate the rotating frame 6, the spray nozzle 6 moves in a circular motion while maintaining the same distance from the furnace wall. It moves back and forth in the circumferential direction at a predetermined angle and continuously sprays the repair material onto the inner wall of the furnace. Furthermore, the arm extension winch 16, the tilting winch 12, and the traveling motor 14 are simultaneously adjusted to move the spraying nozzle to the area requiring repair, and spraying is carried out from the desired height and distance. The spraying situation is monitored by a television camera 16 and the construction is controlled from the TI.

If it is necessary to change the injection angle of the spray nozzle 6, the nozzle mounting structure and helmet can be remotely operated to change the angle with respect to the furnace wall within a range of ±60 degrees.

Once the spraying work is completed, the spray repair equipment is stored on the work deck in the reverse order of the setting procedure described above.

Replacing the blowing nozzle.

The spraying nozzle needs to be replaced due to the type of spraying repair material, spraying method, damage, wear, blockage, etc., so the procedure is explained in Figures 6 and 7. 4 is retracted, and the arm 472 is rotated using the arm tilting winch 12 and stored in the frame B.

(Latch the wire tip of the nozzle replacement winch 20 to the spray nozzle 6 and pull out the nozzle onto the work deck. At this time, extend the arm 4 further north than necessary and extend the telescopic winch 13σ as shown in 1) Adjust the wire stretch.

■ Replace the spray nozzle on the work deck.

■ Operate the above steps in the reverse order to retract the spray nozzle, then tilt and extend it to set it in the predetermined position.

The spray repair device of this invention is as described above.7. Since the number of grooves is c, the furnace at the back can be divided into 16 sleeves during hot heating, and the following effects can be brought about.

1. Since the entire furnace wall can be repaired with one spray nozzle from the upper furnace mouth, there is no need to open many manholes in the furnace body.

2 The spray nozzle adapts to changes in the furnace diameter and inner wall slope profile, and can perform continuous spraying without always maintaining the optimum distance from the r-wall, resulting in less rebound loss of the repair material and uniform reliability. This makes it possible to carry out construction work with a high level of efficiency, thereby extending the life of the repaired furnace body. (Conventionally, the life expectancy after repair is 6 months, but it can be extended to 8 to 10 months.)

6. Spraying amount/work] [Previously 4.8t/person was 11.
(In the case of blast furnaces), construction can be carried out only by monitoring with a TV camera and other sensors and operating the control panel, freeing you from hot heavy labor and bad work environments, improving work efficiency.
Excellent safety.

4. Damaged areas, state of damage, and construction status on the furnace wall? Since the work is carried out by checking and monitoring and spraying from the IC, it may be a waste of time for repairs (repair costs can be reduced).

5. All operations of the equipment are mechanically driven outside the furnace, and are linked to various sensors (spray distance, wall temperature, spray material discharge volume, moisture air volume, etc.), allowing fully automatic control of spray repair work. It becomes possible.

It should be noted that the above explanation has mainly been given in the case of a blast furnace, but it can be applied to the repair of all tall, round-shaped furnaces, and has similar effects.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the structure of the device of this invention, Fig. 2 is a side view of the same, Figs. 6 to 5 show the procedure for performing repair work using this device, and Fig. 6 is a A plan view of the process of pulling this device into the mouth of the upper part of the blast furnace, Fig. 4 is a side view of the same, Fig. 5 is a side view showing the procedure for spraying, and Fig. 6 is a replacement of the nozzle for spraying. The plan view showing the work, Figure 7 is the same (
FIG. In each figure, 1 - main frame, 2 - auxiliary beam, 6 - travel frame, 4 - arm, 5 - locking wire rope, 6 - spray nozzle, 7 - repair material pumping bow, 8 - winch for pulling out auxiliary beam. , 9- winch for storing the auxiliary beam, io- winch for attaching the main body frame, 11'- winch for storing the 111 main body frame, 12- winch for arm tilting, 13-
Winch for arm extension rope, 14---motor for one trip. Agent Patent Attorney Sanro Kimura Figure 5 Figure 6 Heat Figure 7

Claims (1)

[Claims] A main body frame that moves horizontally with an auxiliary beam, a travel frame stored under the main body frame, a telescoping arm that is pivoted to the rotation frame so that it can tilt and travel freely, and the telescoping arm σ) at the tip. Equipped with an attached spray nozzle and a pressure hose for spraying repair material to the nozzle? Features and hot spraying repair equipment for scale furnaces.