JP2014040502A - Maintenance method for coke oven wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a maintenance method for a coke oven wall, which secures the strength of a repair part with improved work efficiency and reduced cost in repairing the coke oven wall in a high temperature environment by thermal spraying.SOLUTION: A maintenance method for a coke oven wall includes the steps of: inserting a heat-resistant cover plate 33 held by a plate presser jig 34 in an inspection opening 10 of a small combustion chamber 1a partitioned by an oven wall 1b so as to press the heat-resistant cover plate 33 against a damaged open hole 1h from one side of the damaged open hole 1h for blocking the damaged open hole 1h; and repairing by thermal spraying a thermal spraying material 36 to the damaged open hole 1h from the thermal spraying nozzle of a spray lance 35 arranged on the other side of the damaged open hole 1h for thermal spraying the thermal spraying material 36. The method further includes the step of removing the plate presser jig 34 from the heat-resistant cover plate 33 after fixing the heat-resistant cover plate 33 to the oven wall 1b so as to leave the heat-resistant cover plate 33 in a state fixed to the oven wall 1b.

Description

  The present invention relates to a furnace wall repairing method for repairing a broken through hole generated in a furnace wall of a coke oven.

  In general, a coke oven is composed of refractory bricks, and a plurality of combustion chambers for burning fuel gas and a plurality of carbonization chambers for containing coal to be subjected to dry distillation are alternately arranged in the furnace group direction. A plurality of (for example, 30 to 100) kilns formed by the combustion chamber and the carbonization chamber are arranged to constitute one furnace group. The combustion chamber is divided into a plurality of combustion chambers by a furnace wall along the furnace length direction orthogonal to the furnace group direction. At the bottom of each combustion chamber, a gas hole for ejecting fuel gas and air And an air hole for injecting or sucking air. Two adjacent combustion chambers are paired and connected at the top, and in a certain period, combustion gas and air are combusted in one combustion chamber and exhausted from the air hole of the other combustion chamber. . Appropriate combustion in the entire furnace is realized by appropriately switching the combustion chamber for burning fuel gas and the combustion chamber for exhausting each time a certain period of time elapses. By the combustion in the combustion chamber, heat is supplied to the coal in the carbonization chamber adjacent to the combustion chamber through the furnace wall, and the coal is carbonized to produce coke.

  The furnace wall separating the carbonization chamber and the combustion chamber, or the furnace wall separating the combustion chambers, may cause bricks to fall off and cause broken through holes due to various factors such as aging. One of the methods for repairing the broken through hole is to reload the bricks at the site where the broken through hole is generated. However, in this transshipment method, the furnace temperature is lowered by stopping the furnace for construction, and the strength of the brick may be impaired, so it is difficult to say that this is a preferable repair method. In particular, in order to repair the central portion of the furnace, surrounding furnaces that do not need to be dismantled must be dismantled, leading to problems such as a long repair period and increased costs.

  Therefore, as one of effective methods for repairing the broken through-hole in a state where the temperature of the furnace is maintained at a high temperature of 800 ° C. or higher without requiring brick replacement, Patent Document 1 discloses a carbonization chamber, a combustion chamber, A method for repairing a broken through hole formed in a furnace wall separating the two is disclosed. Specifically, the heat-resistant patch plate is pressed from the combustion chamber side with a plate holding jig inserted from the upper opening (inspection port) at the top of the combustion chamber to close the damaged through hole, and inserted from the opening at the top of the carbonization chamber The ceramic sprayed material is sprayed onto the damaged through-hole by the spraying machine, and the damaged through-hole is repaired with the sprayed material. According to this method, since the damaged through-hole is closed with the heat-resistant patch plate until the thermal spray repair is completed, it is possible to prevent the sprayed material from passing through the damaged through-hole to be attached and entering the combustion chamber.

JP-A-10-232090

  However, in the above repair method, the heat-resisting contact plate must be pressed against the broken through-hole with a plate pressing jig until the thermal spray repair is completed. If used, the plate pressing jig is bent and deformed due to the high temperature of the combustion chamber. In order to continue the thermal spraying work, every time the plate pressing jig is deformed, it must be replaced with a new jig, which increases work efficiency and cost. In addition, since the damaged through-hole is closed and repaired with only the thermal spray material, the strength of the repaired part is not necessarily sufficient.

  The present invention has been made paying attention to such problems, and its purpose is to ensure the strength of the repaired part and to improve the work efficiency when repairing the furnace wall of the coke oven in a high temperature environment by thermal spraying. It is an object of the present invention to provide a method for repairing a wall of a coke oven with improved and reduced costs.

  In order to achieve this object, the present invention takes the following measures.

That is, the furnace wall repair method of the coke oven of the present invention is a method of repairing damaged through holes generated in the furnace wall in the coke oven,
Insert a heat-resistant contact plate held by a plate holding jig from the upper opening of the space defined by the furnace wall, press the heat-resistant contact plate from one side of the damaged through-hole to the damaged through-hole, Clogging
A thermal spray lance for spraying a thermal spray material is disposed on the other side of the damaged through hole, and a step of spraying the thermal spray material from the thermal spray nozzle of the thermal spray lance to the damaged through hole and repairing, and
Fixing the heat-resistant backing plate to the furnace wall with a thermal spray material, and then detaching the plate holding jig from the heat-resistant backing plate and leaving the heat-resistant backing plate fixed to the furnace wall It is characterized by having.

  If this method is implemented, the heat-resistant backing plate remains fixed to the furnace wall at the position where the damaged through hole is blocked, so the strength of the repaired part is higher than when the damaged through hole is repaired only with the thermal spray material. Can be improved. If the heat-resistant pad is only fixed to the furnace wall, it will be completed before the plate-holding jig is deformed. The deformation of the plate pressing jig can be suppressed or prevented. Therefore, the work efficiency can be improved, the cost can be reduced, and the strength of the repaired part can be secured.

  In order to improve the strength of the repaired part by strengthening the fixing strength of the heat-resistant backing plate to the furnace wall, thermal spraying is performed from the back side of the heat-resistant backing plate, and on both sides in the thickness direction of the heat-resistant backing plate. It is preferable to form a fixed portion to the furnace wall by the thermal spray material.

  In order to suppress or prevent the heat-resistant backing plate from swinging due to thermal spraying, the plate pressing jig applies the hook portion to the hook portion formed on the heat-resistant backing plate, thereby It is desirable to hold the plate in a suspended state and to have a back pressing portion that abuts the back surface of the heat resistant backing plate in the suspended state and restricts the movement of the heat resistant backing plate to the back side.

The perspective view which shows typically the coke oven which is the implementation object of the repair method of one Embodiment of this invention in a partial cross section. The cross-sectional view which shows a coke oven typically. Sectional drawing which shows typically the observation process which observes the damaged through-hole which arose in the furnace wall of the coke oven. The figure which shows a floor-plate installation process typically. The figure which shows a backing plate fixing process typically. The figure which shows a backing plate fixing process typically. The figure which shows a repair process typically. The figure which shows a cleaning process typically.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Coke oven structure>
First, a configuration of a coke oven that is a target for using the repair method of the present embodiment will be described.

  As shown in FIG. 1, the coke oven is composed of refractory bricks, and a plurality of combustion chambers 1 for burning fuel gas and carbonization chambers 2 for storing coal to be carbonized are alternately arranged in the furnace group direction WD. Yes. The combustion chamber 1 and the carbonization chamber 2 have a predetermined height in the furnace height direction HD and a predetermined length in the furnace length direction DD. A plurality of (for example, 30 to 100) kilns formed by the combustion chamber 1 and the carbonization chamber 2 are arranged to constitute one furnace group. The inside of the combustion chamber 1 is visible through an inspection opening 10 provided in the upper part. Coal is charged into the carbonization chamber 2 by a charcoal vehicle from a charging opening 20 provided in the upper portion. The carbonization chamber 2 is heated from an adjacent combustion chamber (1100 to 1350 ° C.) through a furnace wall, coal is carbonized at a temperature of about 1000 ° C., and coke is produced. As shown in FIG. 2, the manufactured coke is pushed out of the carbonization chamber 2 by an unillustrated extruder by opening the furnace lid 21 provided in front of the carbonization chamber 2.

  As shown in FIG. 2, the combustion chamber 1 is partitioned into a plurality of combustion chambers 1 a along a furnace length direction DD orthogonal to the furnace group direction WD. As shown in FIG. 4, a gas hole 12 for injecting fuel gas and an air hole 11 for injecting or inhaling air are provided at the bottom of each combustion chamber 1a. Two adjacent combustion chambers 1a and 1a are connected to each other in the upper part, and in a certain period, combustion gas and air are burned in one combustion chamber 1a, and the other combustion chamber 1a Exhaust from the air hole. Appropriate combustion in the entire furnace is realized by appropriately switching the combustion chamber 1a for burning the fuel gas and the combustion chamber 1a for exhausting each time a certain period of time elapses. As shown in FIG. 1, an inspection opening 10 (upper opening) is provided in the upper part of each combustion chamber 1a.

<Repair method>
As shown in FIG. 2, in the coke oven, a broken through hole may be formed in the furnace wall 2b that separates the combustion chamber 1 and the carbonization chamber 2 or the furnace wall 1b that separates the combustion chambers 1a and 1a. In the present embodiment, as shown in FIG. 3, an example of repairing a damaged through hole 1 h formed in a furnace wall 1 b that separates the combustion chambers 1 a and 1 a will be described. Of course, this repair method can also be used when repairing a broken through hole formed in the furnace wall 2b separating the combustion chamber 1 and the carbonization chamber 2.

  First, a preparation process is performed. In the preparation process, for example, the combustion in the combustion chamber 1a where the damaged through hole 1h is generated is stopped, and the temperature of the bottom brick of the combustion chamber 1a is measured while controlling the temperature to be 900 ° to 1050 °. To do. If the temperature falls below, heat appropriately. In the preparation step, for example, as shown in FIG. 3, the damage state and size of the damaged through-hole 1h generated in the furnace wall 1b using the combustion chamber observation device 30 (see Japanese Patent No. 483129) with a built-in camera. The shape and position are specified by measurement. Specifically, the combustion chamber observation device 30 having a camera built in a heat-resistant housing is suspended from the inspection opening 10, and the position of the broken through hole 1h is specified by the lowered distance and the camera image.

  Next, a floor board installation process is performed. In the laying plate installation step, as shown in FIG. 4, in order to prevent foreign matter from dropping into the air holes 11 and the gas holes 12 at the bottom of the combustion chamber 1, the heat-resistant laying plate 31 is replaced with the air holes 11 and the gas holes. 12 is placed at a position to close. The hook provided on the floor plate 31 is suspended by the hook 32 and placed at a position where the air hole 11 and the gas hole 12 are closed. The floor plate 31 preferably has heat resistance enough to remain for about one day at the furnace bottom of about 1000 °, and examples thereof include a mortar and a heat insulating board.

  Next, a backing plate installation process is performed. In the contact plate installation process, as shown in FIG. 5, the heat-resistant contact plate 33 is formed from the upper opening (the inspection opening 10 or the charging opening 20) of the space (combustion chamber 1a) defined by the furnace wall 1b. It inserts, hold | maintaining with the pressing jig 34, the heat-resistant contact plate 33 is pressed from one side to the broken through-hole 1h produced in the furnace wall 1b of a coke oven, and the broken through-hole 1h is obstruct | occluded. The heat-resistant contact plate 33 is arranged in a posture that spans the peripheral portions of the damaged through-hole 1h in the furnace wall 1b. In the present embodiment, the heat-resistant pad 33 is formed of a fire-resistant castable in which a fire-resistant aggregate and hydraulic cement (alumina cement or the like) are mixed, but may be formed of the same heat-resistant brick plate as that of a coke oven, for example. Good. In addition, the fireproof contact plate is provided with a hook portion for hooking the hook portion 34 a of the plate pressing jig 34. In this embodiment, the hook is a hole that penetrates in the plate thickness direction, but may be a recess that does not penetrate. The plate holding jig 34 has a rod shape formed of, for example, SUS310S, and includes a hook portion 34a for hanging the heat-resistant contact plate 33 on the tip and hanging, and a heat-resistant contact plate 33 suspended on the hook portion 34a. And a back pressing portion 34b for preventing the rocking from being caused by the pressure. The positional relationship with the hook part 34a is prescribed | regulated so that the back surface pressing part 34b may contact | abut to the back surface of the heat resistant contact plate 33 in the suspended state.

  Next, a thermal spraying process is performed. In the thermal spraying process, as shown in FIG. 5, a thermal spray lance 35 for spraying the thermal spray material 36 is disposed on the other side of the damaged through hole 1h, and the thermal spray material is sprayed from the thermal spray nozzle of the thermal spray lance 35 onto the damaged through hole 1h. And repair. The thermal spray lance 35 has a water cooling mechanism for cooling the lance itself by circulating cooling water therein. In this embodiment, flexite manufactured by Nippon Special Furnace Co., Ltd. is used as the thermal spray material, and thermal spraying is performed by the thermite reaction. However, the thermal spraying is not particularly limited thereto. For example, a silica-based material is used as the thermal spraying material, and examples of the thermal spraying method include flame spraying and plasma spraying.

  Although the heat resistant contact plate 33 is pushed by the force of thermal spraying and tries to swing, the back pressing portion 34b of the plate pressing jig 34 abuts on the back surface of the heat resistant contact plate 33 and restricts the movement to the back side. Thus, the swinging of the heat resistant contact plate 33 is appropriately suppressed or prevented. As shown in FIG. 5, the spraying material 36 is sprayed preferentially at the corners of the furnace wall 1b and the heat-resistant backing plate 33, and the heat-resistant coating plate 33 is fixed to the furnace wall 1b by the spraying material 36. To do. Although it cannot be generally stated depending on conditions such as the temperature of the furnace and the material of the heat-resistant pad 33, in this embodiment, the plate pressing jig 34 is deformed in about 15 minutes. The spraying time until temporarily fixing to the wall 1b was completed in about 10 minutes. That is, temporary fixing was completed before the plate pressing jig 34 was deformed.

  Thereafter, as shown in FIG. 6, the plate pressing jig 34 is detached from the heat-resistant contact plate 33, and the heat-resistant contact plate 33 is left fixed to the furnace wall 1 b. In order to firmly fix the heat-resistant backing plate 33 to the furnace wall 1b, thermal spraying is performed from the back side of the heat-resistant backing plate 33, and the furnace wall 1b made of the thermal spray material 36 is formed on both sides in the thickness direction of the heat-resistant backing plate 33. To form a fixed part to.

  When the welding (fixing) of the heat resistant backing plate 33 to the furnace wall 1b is completed, as shown in FIG. 7, thermal spraying is performed to fill the damaged through hole 1h. When the damaged through-hole 1h is large, a plurality of heat-resistant contact plates 33 are used according to the size of the damaged through-hole 1h, the damaged through-hole 1h is blocked by the heat-resistant contact plate 33, and the furnace of the heat-resistant contact plate 33 is used. The process of fixing to the wall 1b and filling the damaged through hole 1h is repeated.

  The plate holding jig 34 and the thermal spray lance 35 are long in accordance with the combustion chamber 1 having a dimension in the furnace height direction HD of about 8 m, and are difficult to suspend by hand. -Elevating operation is performed by a hoist such as a winch attached to CRM (see Japanese Patent No. 4808210).

  When the repair of the damaged through hole 1h is finished, a cleaning process is performed. In the cleaning process, for example, the thermal spray lance 35 is removed, and the thermal spray material 36 that has rebounded and dropped during thermal spraying is cleaned as shown in FIG. Specifically, it is realized by inserting the suction nozzle 37 and sucking the sprayed material or brick fragments from the suction port at the tip. The suction step may be performed by appropriately interrupting the spraying when a predetermined amount of the spraying material is sprayed. Further, the floor plate 31 is collected as necessary. When the above operation is completed, the combustion chamber observation device 30 shown in FIG. 3 is suspended and the inside of the combustion chamber 1 is observed to confirm whether repair is appropriate.

As described above, the coke oven furnace wall repair method according to the present embodiment is a coke oven in which a plurality of combustion chambers 1 and carbonization chambers 2 partitioned into a plurality of combustion chambers 1a are arranged. A method of repairing a broken through hole 1h generated in a furnace wall 1b separating 1a and 1a,
A heat resistant contact plate 33 held by the plate holding jig 34 is inserted from the upper opening (inspection opening 10) of the space (combustion chamber 1) defined by the furnace wall 1b, and the heat resistance is applied from one side of the damaged through hole 1h. Pressing the contact plate 33 against the damaged through-hole 1h and closing the damaged through-hole 1h;
A thermal spray lance 35 for spraying the thermal spray material 36 is disposed on the other side of the damaged through hole 1h, and the thermal spray material 36 is sprayed from the thermal spray nozzle of the thermal spray lance 35 to the damaged through hole 1h for repair.
The heat-resistant pad 33 is fixed to the furnace wall 1b by the thermal spray material 36, and then the plate pressing jig 34 is detached from the heat-resistant pad 33, and the heat-resistant pad 33 is left fixed to the furnace wall 1b. It has the process.

  If this method is carried out, the heat-resistant contact plate 33 remains fixed to the furnace wall 1b at the position where the damaged through-hole 1h is closed, so that the damaged through-hole 1h is repaired only by the thermal spray material 36. As a result, the strength of the repaired part can be improved. Nevertheless, if the heat-resistant backing plate 33 is only fixed to the furnace wall 1b, it is completed before the plate pressing jig 34 is deformed. The jig 34 can be detached to suppress or prevent the deformation of the plate pressing jig 34. Therefore, the work efficiency can be improved, the cost can be reduced, and the strength of the repaired part can be secured.

  In particular, in this embodiment, since the thermal spraying is performed from the back side of the heat resistant backing plate 33 and the fixing portions to the furnace wall 1b by the thermal spray material 36 are formed on both sides in the thickness direction of the heat resistant backing plate 33, the heat resistant backing plate 33 is formed. Can be firmly fixed to the furnace wall 1b, and the strength of the repaired portion can be improved.

  Furthermore, in this embodiment, the plate pressing jig 34 holds the heat-resistant pad 33 in a suspended state by hanging the hook portion 34a on the hook portion formed on the heat-resistant pad 33, and also suspends it. There is a back pressing portion 34b that contacts the back surface of the heat resistant backing plate 33 in a state and restricts the movement of the heat resistant backing plate 33 to the back surface side. According to this configuration, when the heat-resistant backing plate 33 is pushed and swung by the force of thermal spraying, the back pressing portion 34b comes into contact with the back surface of the heat-resistant backing plate 33 and the back surface of the heat-resistant backing plate 33. Since the movement to the side is restricted, it is possible to appropriately suppress or prevent the rocking of the heat resistant contact plate 33.

  As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the present embodiment, the heat-resistant contact plate 33 is arranged in a posture in which the peripheral portions of the damaged through-holes 1h are hung on the furnace wall 1b, but is not limited thereto. For example, if a part of the heat resistant backing plate overlaps with the furnace wall 1b when viewed from the side, the heat resistant backing plate is provided with a convex portion, and the convex portion is fitted into the damaged through hole 1h. You may comprise a board. If comprised in this way, it will become possible to improve the intensity | strength of a repair part further, since a heat-resistant contact plate will be controlled by a convex part to move to an up-down direction and a side.

  In the present invention, the size and shape of the heat resistant backing plate can be appropriately changed as long as the damaged through hole 1h can be closed. Further, since the heat resistant contact plate only needs to close the damaged through hole 1h, it is possible to cope with various sizes of crushing through holes with a certain size heat resistant contact plate.

  When the repair method of the present invention is applied when repairing a broken through hole formed in the furnace wall 2b separating the combustion chamber 1 and the carbonization chamber 2, the heat-resistant pad 33 is pressed from the combustion chamber 1 side. It is preferable to fix them. Since the charging opening 20 that is the upper opening of the carbonization chamber 2 is generally larger in diameter than the inspection opening 10 that is the upper opening of the combustion chamber 1, it is the combustion chamber 1 that is sprayed from the carbonization chamber 2 side. This is because the work becomes easier than thermal spraying from the side. Furthermore, in the case where the heat resistant backing plate is pressed and fixed from the carbonizing chamber 2 side, the heat resistant backing plate becomes a protrusion on the wall surface of the carbonizing chamber 2 and there is a possibility that the proper extrusion of coke may be hindered. This is because this problem does not occur if the heat-resistant backing plate is pressed and fixed from one side.

  The structure employed in each of the above embodiments can be employed in any other embodiment. The specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

1b, 2b ... Furnace wall 1h ... Broken through hole 10 ... Upper opening (opening for inspection)
33 ... Heat-resistant pad 34 ... Plate pressing jig 34a ... Hook 34b ... Back pressing portion 35 ... Thermal spray lance 36 ... Thermal spray material

Claims (3)

A method of repairing a broken through-hole generated in a furnace wall in a coke oven,
Insert a heat-resistant contact plate held by a plate holding jig from the upper opening of the space defined by the furnace wall, press the heat-resistant contact plate from one side of the damaged through-hole to the damaged through-hole, Clogging
A thermal spray lance for spraying a thermal spray material is disposed on the other side of the damaged through hole, and a step of spraying the thermal spray material from the thermal spray nozzle of the thermal spray lance to the damaged through hole and repairing, and
Fixing the heat-resistant backing plate to the furnace wall with a thermal spray material, and then detaching the plate holding jig from the heat-resistant backing plate and leaving the heat-resistant backing plate fixed to the furnace wall A method of repairing a furnace wall of a coke oven, comprising:   The method for repairing a furnace wall of a coke oven according to claim 1, wherein thermal spraying is performed from the back side of the heat resistant backing plate, and fixing portions to the furnace wall by the sprayed material are formed on both sides in the thickness direction of the heat resistant backing plate.   The plate holding jig holds the heat-resistant contact plate in a suspended state by hooking a hook portion formed on the heat-resistant contact plate, and also holds the heat-resistant contact plate in the suspended state. The furnace wall repair method for a coke oven according to claim 1 or 2, further comprising a back pressing portion that abuts on a back surface and restricts movement of the heat-resistant backing plate toward the back surface side.

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