JPH05256584A - Method and apparatus for repairing damaged part on furnace wall in melting furnace - Google Patents

Abstract

PURPOSE:To eliminate inequality of repairs by the difference among individual workers, by a method wherein wear by the melting of a furnace wall in a melting furnace and damage by the dropping-out thereof are quantitatively measured, a required amount of a monolithic refractory is blown against the furnace wall on the basis of these measured values, labor saving is attained by automating the work of repairing the furnace wall and the furnace wall can be precisely repaired even under poor conditions such as high temperature and the existence of dust and vapor. CONSTITUTION:A laser distance-measuring instrument 5 is mounted on a shaftblowing device 4 and is placed at the central part inside a furnace together with the shaft-blowing device 4. A distance (l) to a furnace wall is measured and on the basis of a distance L to a former furnace wall not damaged, the damaged amount of the furnace wall (l-L)is operated by a controller 6. After that, on the basis of the operated value, the shaftblowing device 4 is controlled and a required amount of a monolithic refractory, corresponding to the damaged amount, is blown against the furnace wall.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a blast furnace, a ladle, a converter, an R
The present invention relates to a repair method and apparatus for repairing a damaged portion such as wear due to melting damage of a refractory material lined in a melting furnace such as an H tank or an electric furnace, damage due to falling of the refractory material (hereinafter, simply referred to as damage), and the like.

[0002]

2. Description of the Related Art In a melting furnace such as that described above, it is unavoidable that the refractory lining is gradually damaged, and if a certain amount or more of damage occurs, the iron skin at the damaged portion will glow red and eventually There is a risk of molten pig iron or molten steel leaking out. Therefore, in the above-mentioned melting furnace, in order to prevent such accidents, the furnace wall is inspected regularly or at any time, and according to the degree of damage, the irregular-shaped refractory material is remoted by the blowing device of the shaft inserted in the melting furnace. It was sprayed and repaired by operation.

[0003]

The above-mentioned work for inspecting the furnace wall is performed visually by an operator, and the insulative refractory is sprayed by qualitatively deciding visually the damaged portion and the degree of the damage. Therefore, the repair work could not be performed with high accuracy, and the repair was uneven depending on the judgment criteria of the worker. Further, due to the melting furnace, especially in the blast furnace, the inspection work itself is difficult because of dust and steam in the furnace, and in addition to this, because of the bad working environment of high temperature.

The present invention has been made for the purpose of solving the above-mentioned problems, and it aims at labor saving by automating the repair work of the furnace wall of the melting furnace, resulting in poor temperature and dust and steam. Even under the environment, the wall of the furnace is repaired with high accuracy so that the variation due to individual differences among workers does not occur.

[0005]

According to the repair method of the present invention, a distance measuring device for measuring a distance to a furnace wall is inserted into a melting furnace together with a shaft blowing device, and a furnace wall measured by the distance measuring device by a control device is inserted. It is characterized in that the amount of damage to the furnace wall is obtained from the distance to, and then the shaft spraying device is controlled so that an amount of the irregular shaped refractory material corresponding to the amount of damage is sprayed.

A repair device for carrying out the method is attached to a shaft spraying device, preferably a shaft spraying device, which is inserted into a melting furnace and sprays an irregularly shaped refractory on the furnace wall, A distance measuring device that is inserted into the melting furnace together with the shaft spraying device to measure the distance to the furnace wall, and the amount of damage to the furnace wall is calculated from the distance to the furnace wall measured by the distance measuring device. And a control device for controlling the shaft spraying device so that the amorphous refractory material is sprayed in an amount corresponding to

The distance measuring device used in the present method and device is, for example, a device for applying laser light or ultrasonic waves to the furnace wall to measure the distance until reflection and a laser applied to the furnace wall. It is possible to use various known devices such as a device for measuring the distance from the light spot to the furnace wall based on the triangulation method, but among them, the measurement accuracy is high due to the presence of dust and steam in the melting furnace. It is desirable to use a device that will not be damaged.

Further, the shaft spraying device referred to in the present method and device includes a pump for feeding an irregular refractory material to the device and a flow rate adjusting valve provided on a pipe from the pump to the shaft spraying device. Therefore, the control device also includes controlling the pump and the flow rate adjusting valve.

[0009]

The damage amount of the furnace wall is quantitatively calculated from the distance to the furnace wall before damage which is obtained in advance and the measured value to the furnace wall measured by the distance measuring device at the time of inspection. Then, based on the calculated value, the shaft blowing device automatically blows the amorphous refractory onto the furnace wall.

[0010]

FIG. 1 shows a method for repairing a furnace wall of a blast furnace by using the repair apparatus according to the present invention. The repair apparatus is inserted from the top of the furnace to the center of the furnace in the blast furnace 1 and is installed outside the blast furnace. A shaft spraying device 4 for spraying an irregular-shaped refractory from a tank 2 installed on a trolley via a pipe 3 to a furnace wall 8, and a laser distance measuring device installed in the device 4. 5 and the amount of spraying of the amorphous refractory to the furnace wall according to the distance from the furnace center to the furnace wall measured by the measuring instrument 5, and the shaft spraying device 4 is controlled based on this calculated value. It is composed of a control device 6 and
The distance from the center of the furnace to the wall of the furnace when the blast furnace is constructed is stored in advance.

At the time of repairing, the contents 7 of the blast furnace 1 are reduced to below the damaged portion of the furnace wall and then blown off. Next, the shaft blowing device 4 is inserted together with the laser distance measuring device 5 from the furnace top to the center of the blast furnace, and the lifting rope 9 can be lifted or lowered by winding or unwinding, and rotatably supported in a horizontal plane. . Next, both of these are rotated once in the blast furnace, and the distance from the furnace center to the furnace wall at each point on the circumference is measured. After rotating once to measure the distance from the center to each point on the circumference, the measuring device 5 is lowered together with the shaft spraying device 4 by a fixed amount, and each time it is lowered, the same measurement as above is performed. The obtained data is input to the control device 6.

The control device 6 calculates a difference L-1 between the distance L from the center of the furnace to the furnace wall at the time of blast furnace construction and the measured value l from the center of the furnace at each position of the furnace wall, and calculates the difference L-1 at each position. Calculate the spray amount of amorphous refractory. After descending to the bottom and measuring the distance from the center of the furnace to the furnace wall, the measuring instrument 5 is pulled up to the top together with the shaft spraying device 4. Then, as in the case of the above-mentioned measurement, each time it is rotated once, it is lowered by a fixed amount and the irregular-shaped refractory is moved from the shaft spraying device 4 toward the furnace wall while changing the spraying amount based on the above calculation result. Spray unshaped refractories. The damaged blast furnace wall can be restored to the profile at the time of construction.

In the above method, the profile of the entire worn furnace wall is obtained and then the irregular refractory is sprayed. You may make it spray as much as it divides.

[0014]

According to the method and apparatus of the present invention, the damage amount of the furnace wall is quantitatively measured, and the shaft spraying device is controlled based on the measured value, whereby the required amount of the amorphous refractory material is obtained. It is designed to be sprayed, and it is possible to accurately repair the damaged furnace wall to restore the profile before damage even in a bad environment such as high temperature and the presence of dust and steam. Since the work is automated, the worker and the labor required for the repair can be reduced, and the labor can be saved.

By attaching the distance measuring device to the shaft blowing device, the structure is simpler and the operation is easier than when both devices are individually moved up and down and rotated.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example in which a repairing apparatus according to the present invention is used to repair a furnace wall of a blast furnace.

[Explanation of symbols]

1 ... Blast furnace 4 ... Shaft spraying device 5 ... Laser distance measuring device 6 ... Control device 8 ... Furnace wall

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area C21C 7/10 EF27D 1/16 C 7516-4K

Claims (3)

[Claims] 1. A shaft spraying device and a distance measuring device for measuring the distance to the furnace wall are inserted into the melting furnace, and the control device causes damage to the furnace wall from the distance to the furnace wall measured by the distance measuring device. A method for repairing a damaged portion of a furnace wall of a melting furnace, characterized in that a shaft spraying device is controlled so that an amount of the amorphous refractory corresponding to the amount of damage is sprayed. 2. A shaft spraying device which is inserted into a melting furnace and sprays an indefinite refractory material onto a furnace wall, and a distance measuring device which is inserted into a central part of the melting furnace and measures a distance to the furnace wall. A control device that calculates the amount of damage to the furnace wall from the distance to the furnace wall measured by the distance measuring device and controls the shaft blowing device so that the irregular refractory is sprayed by an amount equivalent to this calculated value. A repair device for a damaged portion of a furnace wall, which comprises: 3. The repair device for the damaged portion of the furnace wall of the melting furnace according to claim 2, wherein the distance measuring device is attached to the shaft blowing device.