JP2007315629A - Repairing method of furnace refractory - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing method of furnace refractory for efficiently performing baking repair by delivering a baking repairing material from far to a working furnace of high temperature (industrial furnace vessel). <P>SOLUTION: The baking repairing material 8 placed on a rotary disc 2 is delivered toward the furnace vessel lined with the refractory from a delivery port 4 by using a delivery system comprising the rotary disc 2, a fixed outer peripheral wall 1 disposed along an outer periphery of the rotary disc 2, having a dynamic friction coefficient with a wrapping material wrapping the baking repairing material 8, of 0.28 or less, and having the delivery port 4 for delivering the baking repairing material 8 wrapped by the wrapping material, and a partitioning wall (vertical wall 3) erected on the rotary disc in a state of passing through a central axis of the rotary disc 2 and extending in the radial direction of the rotary disc 2, while rotating the rotary disc 2 and the partitioning wall (vertical wall 3) so that a peripheral velocity V at an outermost periphery of the rotary disc 2 satisfies an expression; 1≤V<52×Log<SB>10</SB>L+112. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method of repairing a furnace refractory suitable for hot repairing a furnace such as a converter, a ladle, a kneading car, or the like lined with a refractory inside. .

  One of the methods of hot repairing refractories in lining furnaces such as various smelting furnaces and molten metal containers with irregular shaped refractories, uses the heat of the part to be repaired to melt and solidify the repair material. There is a so-called burn-in repair method that repairs the melted part. As repair methods, spray repair method, in-flow repair method, non-aqueous seizure repair method, etc. are implemented.

  The repair method by spraying can be repaired in a relatively short time, but because it is used with a large amount of water, the construction body is inevitably porous and has poor durability. In order to administer this repair agent, many facilities such as a slurry mixing device, a pressure feeding device, and a spraying device are required.

  On the other hand, the water-based inflow repair method and the non-aqueous seizure repair method form a relatively dense construction body. Water-based inflow repair materials have the advantage that the baking time after construction is short, but they are difficult to handle because the material is stored in a mud state, and particle separation is likely to occur during storage, so the durability is non-aqueous. It is inferior to the repair material.

  For this reason, recently, non-aqueous baking repair methods are frequently used as hot repair methods for furnace vessels.

  Indefinite refractories such as non-aqueous seizure repair materials are generally packed in powder, clay, slurry, or supplied as compacts, so repair by spraying Other than the method, there is an advantage that a specific mechanical device is not necessarily required. As this repair method, a container once filled with an irregular refractory material is brought close to the furnace vessel to be repaired, and the repair material in the vessel is moved from the furnace port of the tilted kiln vessel to the recess at the repair location. Alternatively, there is a method in which a bag containing repair material is suspended with a device having a suspension mechanism, and the repair material is dropped to the repair site by moving it to the top of the repair site in the furnace.

  Once the repair material is put in the container and then moved to the repair location, it is difficult to accurately apply the repair material to the target position, and there is also a problem that the repair material adheres to other parts than necessary. . In addition, the method of suspending the bag containing repair material and moving it down requires operation in a high-temperature furnace, so it becomes a large-scale device for the amount of work, and when a large amount of repair material is to be installed. Is not applicable. This method is applied using the fluidity of the repair material and cannot be applied to repair of inclined surfaces such as side walls. In addition, when the repair location is far from the furnace port of the kiln, it is difficult to move the required amount of repair material to the specified position at a time. The so-called hand-throwing repair method, in which the worker throws in the repair area, was used in the field.

  However, in the method in which the worker throws the repair material toward the repair site, the repair range is limited because the throw distance is limited, and it takes more time. It was.

  For this problem, for example, Patent Document 1 discloses a repair technique having a work hatch on the forefront, and uses a hot ladle repair device having a capsule that can be entered by an operator whose outer wall is thermally shielded by a water cooling jacket. By doing so, the technology that enables human work in a high-temperature furnace is provided.

  Further, Patent Document 2 proposes a repair method using an input device in order to reduce heavy labor such as hand-throwing by an operator and shorten work time.

JP-A-11-291024 Japanese Patent Laid-Open No. 08-219660

  However, the installation of the device disclosed in Patent Document 1 requires a large space and there are limitations on installation, and the device itself is expensive.

  Further, in the method disclosed in Patent Document 2, there is a risk that a stopper for stopping the projection arm suddenly at the discharge point or a device for pulling the arm may break down, and it is difficult to operate stably industrially. there were.

  Therefore, there has been a strong demand for a technique that can easily put the repair material on the repair site without using a spraying device and can efficiently repair the repair by baking.

  Therefore, the present invention has been made in view of such problems, and its purpose is to fire a repairing material from a distance using a simple facility in a high-temperature kiln (industrial furnace vessel) in operation. It is an object of the present invention to provide a method for repairing refractories in a kiln that can efficiently perform baked repair of the refractories in the kiln.

That is, the gist of the present invention is as follows.
(1) In a method for repairing a kiln furnace refractory, a firing furnace is used to collide a repair material to be baked into a kiln furnace lined with a refractory. A fixed outer peripheral wall having a dynamic friction coefficient of 0.28 or less with the packaging material wrapping the baking repair material, and having a launch port for firing the baking repair material wrapped in the packaging material; An outermost periphery of the rotating disk is provided on the rotating disk by using the launching device including a partition wall standing upright so as to pass through a central axis of the rotating disk and extending in a radial direction of the rotating disk. The rotating disk and the partition wall are rotated so that the peripheral velocity V of the rotating disk satisfies the following formula (1), and the baking repair material disposed on the rotating disk is directed from the launch port to the kiln furnace vessel. It is characterized by firing To, method of repairing a kiln furnace refractories.
1 ≦ V <52 × Log ₁₀ L + 112 (1)
V: Peripheral speed of the outermost circumference of the rotating disk (m / s)
L: Thickness (mm) of the packaging material for packaging the refractory.
(2) The method for repairing a refractory according to (1), wherein the packaging material has a thickness of 0.13 mm or less.
(3) A guide member for guiding the baking repair material launched from the launch port is provided outside the launch port, and the guide member is moved to change the firing direction of the baking repair material to the rotating disk. The method for repairing a refractory according to (1) or (2), wherein the direction is changed from −35 degrees to +35 degrees with respect to the tangential direction of the outer periphery of the refractory.

  The present invention provides a method for repairing a kiln furnace refractory in which a baking repair material wrapped in a packaging material is simply fired toward a repaired portion of a container lined with a high-temperature refractory. This makes it possible to efficiently repair refractories using baking repair materials in a short time.

  The present inventor has a fixed outer peripheral wall, a rotating disk, a vertical wall, and a launch port from which a repairing material to be baked is fired as a launching device that launches repair material toward a furnace vessel to be repaired at a distance. The firing repair material launching device shown in Fig. 1 was invented.

  The rotating disk 2 is a disk that can be rotated at an arbitrary rotational speed, and the fixed outer peripheral wall 1 is provided along the outer periphery of the rotating disk 2 over, for example, at least a quarter of the circumference. The fixed outer peripheral wall 1 is formed using a material having a dynamic friction coefficient of 0.28 or less with respect to the packaging material that wraps the baking repair material 8. In addition, the fixed outer peripheral wall 1 is formed with a launch port 4 for firing a baking repair material charged on the rotating disk 2.

  On the rotating disk 2, a vertical wall 3 that is a partition wall extending in the radial direction through the center of the rotating disk 2 is erected. A space formed by the fixed outer peripheral wall 1 and the rotating disk 2 is divided into a plurality of spaces by the vertical wall 3. The vertical wall 3 is fixed on the rotating disk 2, and the vertical wall 3 also rotates as the rotating disk 2 rotates.

  In addition, as shown in FIG. 1, the firing repair material launching apparatus includes a raw material shelf 7 storing the repair repair material 8 and an infeed conveyor 6 for feeding the repair repair material 8 onto the rotating disk 2. May be further provided.

  However, even if this device is used, it is not easy to cause the repaired material 8 to collide appropriately with the part to be repaired. There was a case of being scattered. Thus, as a result of intensive studies by the present inventors, a method for efficiently repairing the furnace refractory was found by optimizing the operation method of the launching device and the packaging conditions of the repair material itself.

  Using the launching device shown in FIG. 1, a repair material firing test was conducted under various conditions. In the test, polyethylene, polypropylene, nylon, PET (polyethylene terephthalate), vinyl chloride, or a laminate of the above materials is used as the packaging material, and the repair material 8 is packaged with these packaging materials. I went there.

  As a result of the above-described firing test, as shown in Table 1, when the coefficient of dynamic friction between the fixed outer peripheral wall 1 at the top of the rotating disk 2 and the packaging material for packaging the baking repair material 8 in the apparatus of FIG. It has been found that, regardless of the conditions of the packaging material of the repair material 8, the frequency at which the packaging material breaks rapidly increases while the rotating disk 2 of the device is rotating. This is because the baking repair material 8 wrapped in the packaging material due to the rotation of the rotating disk 2 is subjected to centrifugal force, sticking to the fixed outer peripheral wall 1, and the bag packaging the repair material 8 is torn by the friction force. Can be estimated.

  Next, using polyethylene as a packaging material for the baking repair material 8 and using an iron plate with a dynamic friction coefficient of 0.24, a non-aqueous baking repair material 8 was fired. In the experiment, the destruction speed of the packaging material for packaging the refractory was investigated by changing the rotation speed and the thickness of the wrapping of the repair material 8.

  As a result, as shown in FIG. 2, when the rotational speed of the outermost periphery of the rotating disk 2 is increased, the packaging material may bounce after the collision (after landing). When the relationship between the refractory and the thickness L of the packaging material satisfies the following expression (1), it was found that the material for packaging the refractory collides with the kiln container without breaking.

1 ≦ V <52 × Log ₁₀ L + 112 (1)
V: Peripheral speed of the outermost circumference of the rotating disk (m / s)
L: Thickness (mm) of packaging material for packaging refractories
It is.

  On the rotating disk of the launcher, the repair material rotates at a high speed, the centrifugal force increases by the square of the angular velocity, and the frictional force multiplied by the dynamic friction coefficient acts on the packaging material. It can be estimated that the material is destroyed when a frictional force greater than the allowable tensile stress of the packaging material is applied. Since the allowable tensile strength is considered to be approximately proportional to the thickness of the packaging material, the relationship between the peripheral speed of the outermost periphery of the rotating disk 2 and the thickness of the material was analyzed as follows.

That is, the strength of the bag manufactured using the packaging material is proportional to the thickness L. However, since the breaking force of the bag is proportional to the impact force received by the bag, the strength of the bag is considered to be proportional to the square of the peripheral speed V as a result. Therefore, when organizing the experimental results shown in FIG. 2, a function (a function of the peripheral speed V and the thickness L) representing a line that divides the region where the bag starts to break is 0.5% of the peripheral speed V being the thickness L. It is assumed that the relationship is proportional to the power (V∝L ^0.5 ) or the peripheral velocity V is proportional to the common logarithm of the thickness L (V∝LogL). Therefore, when the function for segmenting the above region is calculated by using the nonlinear least square method, the curve for segmenting the above region can be approximated well by using the function of V∝LogL. ) Condition of the formula could be obtained.

  Therefore, if the thickness of the packaging material of the repair material 8 is adjusted according to the peripheral speed of the outermost circumference of the rotating disk 2 based on the formula (1), the destruction of the packaging material during the disk rotation in the launching device can be prevented. Can do. However, when the outermost peripheral speed is less than 1 m / s, the baking repair agent wrapped in the packaging material will fly only a few meters at the horizontal distance, and the target of the refractory in the kiln to be repaired Cannot reach the point.

  In addition, as shown in FIG. 2, when the thickness of polyethylene as a packaging material exceeds 0.13 mm, it bounces even if the polyethylene bag falls into the kiln, and there is no bag other than the portion to be repaired. I could roll.

  This seems to be because the bag does not break well at the landing point and bounces because the material is thick even if there is an impact of heat or dropping. Accordingly, it has been found that the preferable thickness of the packaging material is 0.13 mm or less.

  Also, if the packaging material is too thin, the packaging material will be broken by the radiant heat from the refractory in the kiln before the baking repair agent wrapped in the packaging material reaches the repaired part of the kiln. There is a fear. Therefore, in order to ensure that the baking repair agent reaches the target point, the thickness of the packaging material is preferably 0.01 mm or more.

  Further, at the end of the fixed outer peripheral wall 1 (that is, the launching port 4) arranged on the upper part of the rotating disk 2 of the launching device, the rotating disk is arranged so that the repair material to be fired can accurately collide with the target container repairing part. It is better to provide a protruding guide wall 5 that can move in the direction of −35 ° to + 35 ° with respect to the tangential direction of the outer periphery of the outer periphery, for example, a fixed wall or a rotating wall composed of a plurality of rotatable rolls is more preferable . In place of the fixed outer peripheral wall 1, a plurality of rollers arranged on the circumference may be used.

  Here, when a wide range of repair is required such that the baking repair material 8 is introduced over a wide range, the movable range of the pop-up guide wall 5 is preferably wide with respect to the tangential direction of the rotating disk 2. However, if the inner angle moves to 35 degrees or more with respect to the tangential direction of the rotating disk 2 (that is, moves to the central axis direction of the rotating disk 2 or more than 35 degrees with respect to the tangential direction of the rotating disk 2), the image is burned. When the repair agent 8 pops out, the guide wall 5 becomes a resistance, and the pop-out speed of the baking repair agent 8 is greatly stalled. Therefore, the pop-out repair agent 8 cannot be skipped.

  Further, even if the external angle is moved to 35 degrees or more with respect to the tangential direction of the rotating disk 2, the baking repair agent 8 does not move along the guide wall 5 and jumps out in the substantially tangential direction. It doesn't make sense. Therefore, the pop-out guide wall 5 is preferably movable within a range of −35 degrees to +35 degrees.

  The packaging material for the baking repair material 8 may be any material such as polypropylene, nylon, PET, vinyl chloride, polyester, PPS (polyphenylene sulfide), PFA (fluorinated resin), acrylic fiber, urethane, paper, etc. Or, you can list the materials that are a combination of them. Good results were obtained for the refractory baking repair material 8 wrapped in these packaging materials in the above-described firing test.

  Examples of the present invention will be described below.

  In the implementation, the apparatus shown in FIG. 1 was used. As the fixed outer peripheral wall 1, an iron plate having a coefficient of dynamic friction of 0.23 with the packaging material of the bag that wraps the baking repair material was used. The rotating disk 2 is installed by welding a vertical wall 3 thereon, and can rotate with the disk. Depending on the distance to the repair location, the rotating disk 2 was arbitrarily rotated so that the peripheral speed of the outer periphery was 7 to 14 m / sec.

  In this embodiment, 2 kg of baking repair material was wrapped in advance using 0.03 mm-thick vinyl chloride as a packaging material, and prepared on the material shelf 7. A baking repair material 8 wrapped in a packaging material one by one from the raw material shelf 7 was moved onto the rotating disk 2 via the infeed conveyor 6. In addition, since the one where the number of the baking repair materials 8 put on the rotating disk 2 is 1, the accuracy of dropping the repaired portion of the target kiln furnace vessel is higher, the raw material is set so as to be in such a situation. The pitch of the baking repair material 8 moved from the shelf 7 to the feeding conveyor 6 was adjusted.

  When the baking repair material 8 is supplied to the launching device, it rolls or slides on the rotating outer rotating disk 2 to the fixed outer peripheral wall 1 under centrifugal force. Eventually, the baking repair material 8 pressed against the vertical wall 3 jumps out to the outside by a centrifugal force from the launch port 4 in which the fixed outer wall 1 is cut out.

  Along with the rotational speed of the rotating disk 2, the pop-up guide wall 5 composed of a plurality of roll groups is moved in the range of −35 degrees to +35 degrees with respect to the tangential direction of the outer periphery of the rotating disk 2 to move the baking repair material. The direction was adjusted.

  As a result, the packaging material that frequently occurred in the launching device is not torn, and the packaging material is not torn apart after reaching the repair position before launching. Significantly improved, the amount of baking material used was reduced to one-third compared to the case where the worker put it in.

  Further, even when a plurality of rollers are arranged on the circumference instead of the fixed outer peripheral wall 1, the outer peripheral speed of the rotating disk 2 is rotated so as to satisfy the above formula (1), and the above refractory material is used. It was confirmed that high-efficiency repairs can be achieved by launching repair materials far away.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

It is a schematic diagram which shows the baking repair material launcher which concerns on this invention. It is a graph which shows the relationship between the thickness at the time of packaging material thickness, the outer periphery peripheral speed, and the condition at the time of the baking repair material landing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed outer peripheral wall 2 Rotating disk 3 Vertical wall 4 Launch outlet 5 Pop-out guide wall 6 Feeding conveyor 7 Raw material shelf 8 Baking repair material

Claims (3)

In a method for repairing a kiln furnace refractory, a firing furnace is used to collide a repair material that is baked into a kiln furnace container lined with a refractory.
A rotating disk,
Launching for firing the baking repair material wrapped in the packaging material and having a coefficient of dynamic friction of 0.28 or less with the packaging material which is installed along the outer periphery of the rotating disk and wraps the baking repair material A fixed outer wall in which a mouth is formed;
A partition wall which is erected on the rotating disk so as to pass through a central axis of the rotating disk and which extends in a radial direction of the rotating disk;
Using said launcher comprising:
By rotating the rotating disk and the partition so that the peripheral velocity V of the outermost periphery of the rotating disk satisfies the following expression (1), the baking repair material disposed on the rotating disk is discharged from the launch port. A method of repairing a kiln refractory, characterized by firing toward the kiln vessel.

1 ≦ V <52 × Log ₁₀ L + 112 (1)

V: Peripheral speed of the outermost circumference of the rotating disk (m / s)
L: Thickness (mm) of packaging material for packaging refractories
It is.   2. The method for repairing a furnace refractory according to claim 1, wherein the packaging material has a thickness of 0.13 mm or less. A guide member for guiding the baking repair material fired from the launch port is provided outside the launch port,
The moving direction of the baking repair material is changed to a direction of -35 degrees to +35 degrees with respect to a tangential direction of the outer periphery of the rotating disk by moving the guide member. The repair method of the kiln refractory according to 2.

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