JP5095127B2 - How to repair kiln refractories - Google Patents

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. to repair the melting portion, there is a method of so-called baking repair, as repair methods, spraying repair method, pouring repair method, such as only repair method with can nonaqueous sintered is 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 the repair material, slurry mixing apparatus, requiring many facilities, such as pumping equipment and spraying device.

On the other hand, only repair method with can burn the pouring repair methods and non-aqueous water-based, to form a relatively dense construction body. While pouring repairing material for water system has the advantage that a shorter only time with baked come after construction, and be difficult to handle for storage in a slip state material, and is easy to occur the particle separation during storage, durability Is inferior to non-aqueous repair materials.

Therefore, recently, as the hot repairing method kiln vessel, only repairing method with baked come nonaqueous is frequently used.

Monolithic refractory, including such non-aqueous baked come with only repair material is generally powdered, kneaded earth form, either packaged in a slurry state, or to be supplied as moldings, blow There is an advantage that a specific mechanical device is not necessarily required other than the repair method by attaching. 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, without using a spraying device, it can be placed in the repair site baking repairing material easily, which can be efficiently burned repair technique has been desired.

  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, and a rotating disk and an upper part of the rotating disk, Launch port for firing the baking repair material wrapped in the packaging material, having a coefficient of dynamic friction of 0.28 or less with the packaging material which is fixedly installed along the outer periphery and wraps the baking repair material A fixed outer peripheral wall formed as a notch , and a partition wall which is erected on the rotating disk so as to pass through the central axis of the rotating disk and extends in the radial direction of the rotating disk. The baking disposed on the rotating disk by rotating the rotating disk and the partition so that the peripheral speed V of the outermost periphery of the rotating disk satisfies the following expression (1) using the launching device provided: Repair material Characterized in that to fire toward the kiln vessel from repairing method kiln 耐盤 fire thereof.
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) the outside of the discharge orifice, wherein a guide member for guiding the firing has been the baked repair material from the firing port, the guide member by moving the, the firing direction of the baking repair material, the firing port The refractory repair method 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 rotating disk at the end of the refractory disk.

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 repair refractories using baking repair materials efficiently 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. And tested .

It said firing test results, as shown in Table 1, when the dynamic friction coefficient between the packaging material for packaging repair material 8 baking the fixed outer circumferential wall 1 of the upper portion of the rotary disk 2 in the apparatus of FIG. 1 is more than 0.28 , Whatever condition packaging material repair material 8, the frequency of rotating disk 2 of the apparatus packaging material is broken during rotation, it was found that rise sharply. This is because the baking repair material 8 wrapped in the packaging material by the rotation of the rotating disk 2 is subjected to centrifugal force, and sticks to the fixed outer peripheral wall 1, and the bag that wraps the repair material 8 is torn by the frictional force. Can be estimated.

Next, using polyethylene as a packaging material for baking repair material 8, using the iron plate dynamic friction coefficient is 0.24, was test fired nonaqueous baking repairing material 8. 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). And the thickness L of the packaging material for packaging the refractory satisfy the following formula (1), it was found that the material for packaging the refractory collides with the furnace vessel without being destroyed.

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, it is considered that the breaking force of the bag is 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∝Log ₁₀ L). Therefore, when the function for segmenting the above region is calculated using the nonlinear least square method, the curve for segmenting the above region can be approximated well by using the function of V∝Log ₁₀ L. The condition of the formula (1) 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 peripheral speed of the outermost circumference is less than 1 m / s, the baking repair material 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. It was sometimes resulting in rolling.

This is, even if there is a shock of heat and fall, for Thickness of the material is thick, is not cracking successfully bag in landing the point, it seems to bounce. 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 material 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 material 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 provided with a guide wall 5 popping movable to -35 degrees to + 35 degrees with respect to the tangential direction of the second outer circumferential direction, the pop-out guide wall 5, for example, a fixed wall formed by a plurality of rolls rotatable More preferably, it is a rotating wall. 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 material 8 pops out, the guide wall 5 becomes a resistance, and the pop-out repair material 8 is greatly slowed down. Therefore, the pop-up repair material 8 cannot be skipped.

In addition, even if the outer disk moves beyond 35 degrees with respect to the tangential direction of the rotating disk 2,
The baking repair material 8 does not move along the guide wall 5 and jumps out in a substantially tangential direction. 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. The number of baking repairing material 8 Add on the rotary disc 2 is preferable to set to one, the raw material shelves as their high accuracy make dropped on the repair portion of the kiln vessel of interest, the such a situation The pitch of the baking repair material 8 moved from 7 to the feeding conveyor 6 was adjusted.

When the baking repair material 8 is supplied to the launching device, the baking repair material 8 rolls or slides on the rotating outer disk 2 to the fixed outer peripheral wall 1 due to centrifugal force. Finally, baking repairing material 8 which is pressed against the vertical wall 3, the ejection port 4 formed by cutting the fixed outer circumferential wall 1, jumping out to the outside by the centrifugal force.

  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 Outlet guide wall 6 Incoming 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,
Fixed to the upper part of the rotating disk along the outer periphery of the rotating disk, and has a coefficient of dynamic friction with the packaging material enclosing the baking repair material of 0.28 or less, and is wrapped in the packaging material A fixed outer peripheral wall in which a launch port for firing the baking repair material is formed as a notch ,
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 on the outside of the launch port,
By moving the guide member, the firing direction of the baking repair material is changed from −35 degrees to +35 degrees with respect to the tangential direction of the outer periphery of the rotating disk at the end of the launch port. The method for repairing a furnace refractory according to claim 1 or 2, characterized in that it is characterized in that

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