JPS5850287B2 - How to repair blast furnace walls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing a damaged wall in a blast furnace, and particularly to a method for repairing a damaged portion of a wall in a blast furnace in which the furnace body cooling structure is a cooling plate type.

At the end of the furnace life of a blast furnace, large furnace wall bearings fall off locally or completely in certain areas and are worn out.

In this part, a large thermal load is applied to the steel shell, resulting in problems such as cracks in the steel shell and gas leaks.

As a result, the operating efficiency of the blast furnace decreases significantly, and eventually the blast furnace must be repaired.

Conventional furnace wall repairs can be broadly divided into (a) blast furnace operations are completely stopped, workers enter the furnace after the furnace body has cooled down, and perform repair work; A method for restarting operations, (b) A method in which the damaged part of the blast furnace wall is opened from the outside, a press-fitting nozzle is inserted through this opening, a monolithic refractory of an appropriate viscosity is press-fitted at the required pressure, and then it is dried and solidified.%
However, method (a) above requires a long time for repairs because the work is carried out after the furnace body has completely cooled down, and the adverse environment has a significant impact on the human body, and it is difficult to restart blast furnace operations smoothly. However, it is difficult to carry out, and has drawbacks such as extremely large industrial losses.

In addition, although the above method (b) has the advantage of being able to repair the furnace wall without stopping the blast furnace operation, it is a method in which refractory material is press-fitted from the outside by opening a sound shell, so it is difficult to repair the furnace wall. This method has the disadvantage that repairs will be useless unless the damage condition, location, etc. of the damaged part of the wall are accurately grasped.

The present applicant has solved the shortcomings of the conventional method and is capable of repairing the blast furnace in a hot state by operating the blast furnace at reduced scale, as well as being able to accurately grasp the damage status and location of the furnace wall and perform appropriate repair work. As an internal repair device, for example, Japanese Patent Application Laid-Open No. 55-5040
No. 9 (blast furnace wall hot repair device) was proposed and has achieved great results.

An object of the present invention is to provide a method for repairing a blast furnace wall, which can effectively repair a damaged part of the wall of a blast furnace, especially a cooling plate type blast furnace, and can increase the strength of the repaired part after construction. With the goal.

Another object of the present invention is to provide a repair method that allows reliable repair by grasping the situation inside the furnace.

Note that when carrying out the repair method of the present invention, more effective repair can be achieved by using the above-mentioned hot repair equipment, but it is of course possible to carry out the repair method using other methods (such as pouring refractory material). can achieve the objectives of

The details of the present invention will be described below with reference to the drawings, and the illustrated example shows a repair mode performed using an internal repair device for a blast furnace.

Figure 1 shows the state in which the repair equipment is installed in the blast furnace.
In the figure, reference numeral 1 denotes a guide frame that extends above the blast furnaces in a nearly horizontal direction passing through the center of the blast furnace. It is fixed at 3.

Reference numeral 4 denotes a transverse truck movably supported via wheels or the like along a guide laid on the guide frame 1, and 5 is a telescoping cart whose upper end is connected to the lower part of the transverse cart 4 via a pivot 12. The arm support 5 is, for example, an inner cylinder 5.
The arm strut 5 is configured to be pivotable about a pivot 12 and rotatable around the axis.

6 is a nozzle holding arm connected to the vicinity of the tip of the arm support 5 via a pivot 13, and 7 is a monolithic refractory spray nozzle provided at the tip of the arm 6.

Further, numeral 9 denotes a truck moving device consisting of a wire and a forward/reverse motor attached to the transverse truck 4, and 10 denotes the arm support 5.
14 is an elevating device that extends and contracts the arm support 5 by winding up and unwinding a wire 11 attached to the upper part of the outer cylinder 5b of the arm support 5. A rotating device 15 is a monolithic refractory feeder, and the rear end of a pressure hose 16 that passes through the arm support 5 and connects to the spray nozzle 7 is attached thereto.

The moving device 9, the lifting device 10, and the feeder 15 are arranged on the work floor 8 outside the furnace, and the rotating device 14 is arranged on the guide frame 1.

Reference numeral 17 denotes an auxiliary trolley that moves in the same direction as the traversing trolley 4 moves, and serves to hold the arm support 5 substantially parallel to the guide frame 1 before the arm support 5 is inserted into the furnace.

18 is a wire for adjusting the angle θ of the arm, and 19 is a counterweight provided on the opposite side to maintain balance with the arm 6.

Further, reference numeral 21 denotes cooling plates installed in a staggered manner in the blast furnace to protect the blast furnace body.

The cooling plate 21 has a structure that can be removed and attached from outside the furnace, and by removing the cooling plate 21 from the damaged furnace wall portion 20, an opening 23 can be obtained in the furnace wall.

Using the opening 23, a refractory reinforcing body 22 as shown in FIGS. 2a and 2b (for example, a heat-resistant wire mesh or a frame with studs installed as shown in the figure) 22 is installed in the damaged area 20 of the furnace wall. .

FIG. 3 shows a method for inserting and fixing the reinforcing body 22 into the furnace, and a shows a state in which the reinforcing body 22 is inserted into the furnace from the opening 23 via the wire 29.

30 is blast furnace skin.

In b, the reinforcing body 22 is suspended and fixed in the furnace via the frame 31, and in C, the reinforcing body 22 is then welded and fixed to the iron skin 30 of the opening 23 using a welding machine 32. It is in a state of being.

After fixing the refractory reinforcing body 22 to the damaged part 20 of the furnace wall in this way, the removed cooling plate 21 is reattached, and then the monolithic refractory spray nozzle 7 of the above-mentioned repair device is directed to the relevant part to repair it. I do.

In this case, the refractory spraying device is operated while observing the area to be sprayed 20 through the opening 23 obtained by removing the cooling plate 21 on the side facing the area to be sprayed (i.e., the damaged part of the furnace wall).
When the operator 26 operates the pendant switch 27 to perform spray repair, proper repair can be performed.

The pendant switch 26 is connected to the cable 2 on the operation panel 24.
5a, and cables 25b, 25c, and 25d are interposed from the operation panel 24 to drive the refractory pumping machine 15, the lifting device 10, and the rotating device 14.

Figure 2 shows the furnace wall after spraying repair.
2 is buried in the sprayed refractory 23.

Note that 28 is a work floor.

The refractory reinforcing body 22 serves to hold and reinforce the sprayed monolithic refractory, and its size is determined by the dimensions of the opening 23 from which the cooling plate 21 is removed, and its shape is not particularly limited. Generally, there is no problem as long as it is a holder that has been conventionally used as a holder for monolithic refractories.

In the above example, the refractory material spraying device is an internal type shown in FIG. A pouring method can be adopted.

As an example, a pouring method is shown in FIG.

Inserting the reinforcing body 22 through the cooling plate removal opening 23 and hanging and fixing it to the iron skin 30 is the same as in the previous embodiment.

In the case of pouring, a plate material 34 (combustible material, e.g., wooden board) is installed near the front of the reinforcing body 22 to serve as a formwork, and a paste-like refractory feed nozzle 35 is used to pass the refractory through the opening 23 and pour the material. Just pour in a shaped refractory.

The plate material 34 burns and disappears after the refractory solidifies to a certain level of strength.

The cooling plate can be reinstalled after pouring.

As described above, the present invention inserts a refractory reinforcing body into the furnace through the cooling plate removal opening of the damaged part of the blast furnace wall, hangs and fixes the reinforcing body to the damaged part, and then inserts the reinforcing body into the damaged part. Since it is characterized by spraying monolithic refractories, the repaired area is firmly supported and fixed during spraying, and the life of the furnace can be improved.

Further, the present invention provides the following methods: removing the cooling plate at a portion facing the damaged furnace wall, providing an opening, and observing the inside of the furnace through the opening;
The present invention is characterized by directing a monolithic refractory pressure feeding nozzle toward the damaged area and operating the pressure feeding nozzle, so that repairs can be performed accurately according to the area to be repaired, thereby improving the life of the furnace.

Therefore, this effect enables the above-mentioned repair effect of supporting and fixing to be carried out more reliably.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of how to use the repair device according to the present invention, Fig. 2a is a front view showing a fireproof reinforcing body attached to a damaged part in the furnace, and Fig. 2b is a sectional view after repair. FIGS. 3a, 3b and 3c are sectional views showing a method of inserting and fixing the reinforcing body into the furnace. FIG. 4 is an explanatory diagram showing an example in which the present invention is applied to a pouring method. 1... Guide frame, 2... Blast furnace opening, 3... Frame, 4... Traverse trolley, 5... Arm support , 4... Arm,
7... Spray nozzle, 8, 28... Working floor, 9... Cart moving device, 10... Lifting device, 11.18...・Wire 12, 13
... Pivot, 14 ... Rotating device, 15.
..... Monolithic refractory feeder, 16.. Material pressure feeding hose, 17.. Auxiliary trolley 19..
... Counterweight, 20 ... Repair area, 21 ... Cooling plate, 22 ... Refractory reinforcement, 23 ... Cooling plate removal opening , 24...
...Operation panel, 25a. b, c, d... Cable, 26... Operator, 27... Pendant switch, 29.
...Wire 30...Blast furnace skin, 31.
...Fixed frame, 32...Welding machine.

Claims (1)

[Scope of Claims] 1. Remove the cooling plate from the damaged part of the blast furnace wall, insert a refractory reinforcing body into the furnace through the opening after removal, and suspend the reinforcing body from the damaged furnace wall to close the opening. A method for repairing a blast furnace wall, comprising: forming a monolithic refractory repair wall in the damaged part after fixing the wall to the steel shell near the damaged part. 2. Remove the cooling plate from the damaged part of the blast furnace furnace wall, insert a refractory reinforcement into the furnace through the opening after removal, hang the reinforcement from the damaged furnace wall, and attach it to the steel shell near the opening. At the same time, the cooling plate at a portion facing the damaged furnace wall is removed to form an opening, and the interior of the furnace is observed through this opposing opening, and a monolithic refractory repair wall is formed in the damaged portion. A method for repairing blast furnace walls.