JP2001019968A - Repairing method for coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing a coke oven, capable of efficiently repairing bricks of the coke oven of a chamber-type having a complicated configuration of brick checkerwork in the combustion chamber. SOLUTION: This method for repairing a coke oven comprises dividing a bounded brick wall to be repaired into plural piled parts, forming a refractory aggregate 10 at the outside of the oven by combining bricks so as to have the same configuration to that of the each piled part, dismantling to remove the bounded brick wall for repairing from the coke oven, and constructing the brick wall with the each formed refractory aggregate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a coke oven, and relates to a method for repairing a damaged wall of a combustion chamber of a coke oven with high efficiency regardless of the type of the coke oven. About the method.

[0002]

2. Description of the Related Art A coke oven type coke oven comprises a carbonization chamber for carbonizing coal, a combustion chamber for burning fuel gas, and a heat storage chamber for preheating fuel gas and combustion air by utilizing residual heat of combustion exhaust gas. . The carbonization chambers and the combustion chambers are alternately arranged in the horizontal direction in a plan view to form a horizontally long furnace group as a whole. The coal charged into the coking chamber receives the heat generated in the combustion chamber through the brick wall and is carbonized by carbonization. When the coke is generated, the furnace lids installed on both sides of the coking chamber are opened, and the extruder pushes the generated coke from one opening on both sides to the other opening and discharges it.

Since the coke oven is repeatedly carbonized and discharged over the operating period of the coke oven for more than 20 to 30 years, the wall refractories forming the wall of the coking chamber of the coke oven are worn. In addition, every time the coke is discharged,
Since the furnace lid on one side is opened, the wall of the carbonization chamber, especially near the furnace lid, has a severe temperature history of temperature rise and fall, and is easily damaged. For this reason, repair for reloading the refractory of the coking chamber wall of the coke oven has been performed.

The carbonization chamber wall is a partition wall between adjacent carbonization chambers, and forms a combustion chamber therein. Conventionally, the repair of the carbonization chamber wall has been performed as follows. First, two adjacent carbonization chambers are emptied. Install an insulating wall in it,
The temperature of the work space surrounded by the heat insulating wall is lowered to a temperature at which work is possible. Next, the walls, which are the partition walls of two adjacent carbonization chambers, are dismantled, and bricks are manually piled on the dismantling traces one by one to restore the wall.

In the method of stacking bricks one by one, the dimensions of the space are measured after dismantling of the brick to be renewed, and the three-dimensional position of the non-repaired portion of the combustion chamber wall brick is determined.
After calculating the dimensions after the completion of the temperature increase in consideration of the expansion of the bricks to be used, the thickness of the joint of the brickwork of the repair part and the position of the fitting part between the bricks are adjusted. Therefore, it is possible to form a smooth continuous wall between the non-repaired part and the repaired part of the combustion chamber wall brick, and to reduce the frictional resistance between the coke and the wall in the coke extrusion work after the coke oven is operated. it can.

In the above-mentioned repair method, bricks are assembled one by one in a narrow furnace, so that a long time is required for the work, and equipment downtime becomes long, resulting in a large reduction in production. Although the temperature inside the furnace to be repaired is lowered, the furnace temperature cannot be completely lowered to the outside air temperature. Therefore, furnace construction work for a long time is a work with a large load on the worker.

To solve this problem, Japanese Patent Laid-Open Publication No.
No. 13388 discloses a technique for repairing a reloading portion of a heating wall of a coke oven using a large-sized module brick integrally formed. This module brick is one in which a flue forming a combustion chamber of a coke oven and a wall of a carbonization chamber are integrally formed, and is manufactured in advance. In this technique, since a module brick having a size larger than that of the conventional single brick is used as a single brick, a repair work time in the coke oven can be reduced, and a work load can be reduced. Also, the repair time can be reduced. Therefore, it is possible to reduce the coke reduction, and at the same time, to shorten the working time. Such a module brick applied to a Coppers type coke oven as exemplified in the publication can be manufactured relatively easily. In a Coppers type coke oven, the flue formed in the combustion chamber extends straight from the lower end of the combustion chamber to the upper end, makes a U-turn at the upper end and returns to the lower end, and a large number of such flue lines form the combustion chamber in parallel. are doing. In other words, modular bricks have a simple shape with several vertical holes in a large brick. Therefore, molding is not difficult.

However, in a coke oven in which the structure of the combustion chamber brick has a complicated shape, for example, a coke oven of the Carl still type, it is extremely difficult to form the module brick itself. In a Carlstil type coke oven, the combustion chamber has three types of paths, a gas path, an air path, and a flue, extending from the lower end to the upper end of the combustion chamber. There is a diagonal opening from the entrance to the flue. For this reason, in order to form a Carlstil type combustion chamber with modular bricks, it is necessary to form modular bricks having diagonal openings in the inner wall in addition to vertical holes. Therefore, in order to manufacture a large module brick, there is a problem that not only the core shape becomes complicated, but also the dimensional accuracy decreases during firing.

The module brick is formed by putting a refractory raw material into a mold and molding and firing. Therefore, a large number of modular bricks having a predetermined shape according to the drawing dimensions and the like are manufactured in advance and used at the time of repairing a coke oven. Brick walls of coke ovens are typically deformed over many years of use, especially when the vertical plane is tilted. For this reason, when stacking module bricks manufactured in advance according to the drawing dimensions, compared to the case where conventional single bricks are stacked one by one because the number of joints is small, it is necessary to adjust at one joint The amount of adjustment that must be avoided increases, and the joints become discontinuous steps, making it impossible to form a smooth wall surface as a whole. That is, the frictional resistance between the coke and the wall after the operation of the coke oven is increased, and the period until the repair is shortened. To avoid this, it is necessary to use a cutter or sander to smooth out the discontinuous steps on the wall after bricking, but this will lead to a longer brickwork in a high-temperature environment. ,
This reduces the effect of using module bricks.

Next, the horizontal joint in the construction of the conventional coke oven wall will be described. In the construction of a conventional coke oven, a single brick to be piled usually has a height of 130 m.
m, weight 10kg or less, height 250m at most
m, weight 25 kg or less. In such a brick, the vertical load applied to the horizontal joint joint trowel (joint mortar) was as small as about 25 to 60 kg / cm ² at most.
In addition, since the time required for loading the bricks after attaching the toro is short, even if a mortar whose consistency (consistency of mortar: JIS R2506) is adjusted to be small, the joint thickness is 3 to
It was possible to work strictly according to the regulation of 5 mm. However, when building high and heavy bricks,
The vertical load applied to the laying toro is increased, and the laying toro may be reduced and contracted before the strength is developed.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to repair a coke oven of a type having a complicated structure by reducing the working time in a high-temperature environment to be equal to or longer than that of using a module brick. The present invention provides a method capable of reducing the work load of reloading bricks.

Another object of the present invention is to provide a method of repairing a coke oven which is capable of performing a highly efficient and appropriate repair for repairing a coke oven wall which has been used for many years and has variously deformed. That is.

Still another object of the present invention is to provide a high height,
It is an object of the present invention to provide a method that can prevent a trowel laid on a horizontal joint from being pressed down and contracted when a heavy brick is constructed, and can be constructed accurately.

[0014]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and its technical means is to repair a coke oven by dividing a wall to be repaired into a plurality of laminated portions. After forming a refractory assembly combining a plurality of bricks in a shape corresponding to each laminated portion outside the furnace, disassembling and removing a wall repair portion of a coke oven, and constructing a wall with the refractory assembly. A method of repairing a coke oven characterized by the following.

In the present invention, the refractory aggregate means a refractory combined body formed by combining a plurality of bricks into a large size. The plurality of bricks may have a shape larger than a conventional brick as long as the size is easy to handle. This refractory assembly is a refractory assembly having a shape matching the dimensions and shape of the dismantled portion and the remaining portion of the wall to be repaired. Since this refractory assembly is assembled outside the furnace with a good working environment using a refractory unit (brick) that is easy to handle, it can be easily and accurately manufactured. Since the wall is built by transporting the refractory assembly into the furnace, the number of refractories to be applied is reduced, and therefore, the number of furnaces to be built in the furnace is reduced, and work time in the furnace is reduced. You. For this reason, the working environment of the worker is greatly improved. Further, since the dimensions and shapes of the dismantled portion and the remaining portion of the wall body are reflected in the shape of the refractory aggregate, it is possible to suppress an increase in the frictional resistance of the furnace wall during coke extrusion by the extruder.

According to the present invention, in a method of repairing a coke oven, a wall to be repaired is divided into a plurality of laminated portions, and a plurality of bricks are combined in a shape matching the main portion of each laminated portion. Is formed outside the furnace, and after the wall repair part of the coke oven is dismantled and removed, a wall body is constructed by combining the refractory assembly and a single brick to provide a repair method for a coke oven. . In this method, finer adjustment of the wall surface can be performed while securing the merits of the refractory assembly, and more suitable repair can be performed.

In the method for repairing a coke oven, a spacer is arranged at a joint of the refractory aggregate,
It is preferable that the upper refractory assembly is placed on the spacer to form a joint. This is to improve the difficulty of joint construction due to the large size of the refractory aggregate.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 8 is a schematic cross-sectional perspective view of a part of a coke oven 100 having an upper horizontal flame passage to which the present invention is applied. In the coke oven 100, a carbonization chamber 102 for carbonizing coal and a combustion chamber 104 for burning a fuel gas 125 are alternately arranged. The fuel supplied from the fuel gas pipe 120 and the air 122 taken in are mixed with the combustion chamber 104.
It is led inside and burns here. The combustion chamber 104 has a large number of fuel gas and air outlets in a vertical passage. The combustion gas rises in the combustion chamber 104 while heating the walls and descends through the upper horizontal flame channel 126 to the adjacent combustion chamber. The wall of the combustion chamber 104 is the wall of the carbonization chamber 102, and the heat of combustion contributes to coal carbonization through this wall. Exhaust gas 12
8 is discharged from the chimney 136 through the heat storage chamber 106, the small flame path 130, and the large flame path 132. The fuel gas pipes 120 are arranged on both sides of the coke oven 100, and are switched and used at regular intervals, so that the flow of the combustion gas reverses. Thermal storage room 1
06 recovers the waste heat of the exhaust gas 128 and generates the next combustion air 12.
2 and for heating the fuel gas 125. Coke oven 10
0, the coal loading inlet 110, the combustion chamber peephole 11
2 are provided.

When extruding the produced coke, the vicinity of the extrusion port (kiln port) of the carbonization chamber 102 is exposed to severe use conditions due to cooling and friction. More severe damage than part. Therefore, it is necessary to repair the wall of this part after many months of use. Coking room 10
2 has a built-in combustion chamber 104,
It is particularly suitably applied to a coke oven provided with a combustion chamber 104 having a complicated structure.

Hot transfer of 4 flue furnace ports was performed in a multi-stage combustion type coke oven having a furnace height of 6 meters and an upper horizontal flame path. The kiln opening 4 flue is a portion of the combustion chamber on the kiln opening side up to four vertical gas paths. The bricks in the combustion chamber were formed by stacking 38 bricks from the bottom of the carbonization chamber to the upper level of the upper horizontal flame channel. Among them, the vertical passage portion of the combustion chamber was loaded with small bricks 34. In the present embodiment, a large-sized brick having a height of two steps of these conventional small bricks was used, and the large-sized bricks were stacked in two to three steps to form a refractory aggregate. Therefore, 4 ~
Six steps of bricks could be constructed in the furnace at once. In addition, large bricks were used for the hand-held parts, shortening the overall repair process.

FIG. 2 is a cross-sectional view showing the entire combustion chamber wall as viewed from the kiln opening of the coke oven after hot transfer in this embodiment. First, third, fifth, seventh, ninth, eleventh, thirteenth of the combustion chamber
15, 17, 19, 21 Brick 30, 32, 34, 3
6, 38, 40, 42, 44, 46, 48, 50 are stacked alternately. Also, a plurality of fuel gas / air ports 54 are open. A horizontal flame path 52 is provided at the upper part. The ceiling 58 is provided with a combustion chamber viewing hole 56 therethrough.

FIG. 1 is a perspective view showing an example of a refractory assembly 10 used for the repair work. Refractory aggregate 10
Is constructed by combining a plurality of refractory units such as a binder brick 16, a Loyfer brick 14, and a front brick 18. A fuel gas / air passage 12 is provided in the binder brick 16, and an ejection port 20 forming a combustion nozzle opens to the flue 22.

The repair work process is as follows.

(A) First, the dimensions of the dismantled portion and the three-dimensional characteristics of the remaining combustion chamber wall, such as twist and fall, are measured. The wall to be repaired was divided into a plurality of laminated portions, and the shape and dimensions of the refractory assembly corresponding to each laminated portion were determined. The size of each refractory assembly is such that in the combustion chamber composed of 21 refractories up to the level of the horizontal flame duct in the height direction, one refractory is used in the second to fourteenth stages from the lowest stage. The object aggregate was made to be one to three steps high of a large brick. The size of the refractory assembly depends on the transport capacity from the manufacturing location outside the furnace to the front of the furnace where the transfer is performed, and the horizontal and vertical movement when bringing the refractory assembly into the furnace from the front of the furnace. You are limited by your ability. The range in the height direction in which the refractory assembly can be used is determined by the size and operation range of the device that moves vertically in the furnace.

(B) Next, a refractory assembly was manufactured outside the furnace. As shown in FIG. 1, a refractory assembly is composed of a large number of refractory singles and a large brick in two steps in the height direction.
The size was increased to three steps, or three steps of large bricks (not shown) were increased to one step. As shown in FIG. 2, the refractory aggregates are in the second to third stages, the fourth to fifth stages, and the sixth to eighth stages.
The first, second, third, fourth, and fifth refractory aggregates form the lower, ninth to eleventh, and twelfth to fourteenth stages, respectively.

(C) The first to fifth refractory assemblies were taken into a furnace and built.

(D) After the furnaces of the first to fifth refractory assemblies were completed, bricks of the 15th to 21st stages were manually piled.

Next, the dismantling of the furnace wall according to the present invention will be described with reference to FIGS. FIG. 3 is a horizontal sectional view of a kiln brick of a Carl still coke oven showing one embodiment, FIG. 4 is a side view of the kiln brick of FIG. 3, and FIGS. It is a side view explaining.

As shown in FIG. 3, the combustion chamber 60 and the carbonization chamber 6
2 are alternately arranged adjacent to each other, and the wall of the combustion chamber 60 forms the wall of the carbonization chamber 62. The brick transfer area was a portion from the kiln opening 64 to the old and new brick joints 68 shown in FIG. 3, that is, a portion including four flews 66. In the disassembly of the transfer area, as shown in FIGS. 3 and 4, a cut was first made in a joint 70 immediately before the joint to be the new and old brick joint 68 by a cutter. Next, the brick 76 from the kiln opening 64 to the joint 70 where the cut was made was dismantled by an air pick. Since the vibration and shock generated at this time were reduced at the cut position (the position of the joint 70), at this stage,
As shown in FIG. 5, joint 7 cut by a cutter
At 0 or near the cut position, the brick was dismantled, and the non-transferred portion brick 72 did not crack.

Subsequently, the remaining furnace wall brick 74 up to the old and new brick joints 68 was carefully dismantled using a cutter, hammer and chisel. At this time, since the hand can be put inside the combustion chamber, sufficiently careful disassembly becomes possible.
In this way, a healthy new and old brick joint 68 as shown in FIG. 6 can be secured.

Although the above is an example of the transfer of the Carl Still coke oven, the present invention can be easily applied to other types of coke ovens.

Next, the construction of the horizontal joint between the refractory aggregates of the present invention will be described. FIG. 7 is an explanatory view of the joint construction between the refractory assemblies, showing the lower refractory assembly 10a on which the upper refractory assembly is placed. After the upper refractory assembly is transported into the furnace and positioned, a mortar whose consistency is adjusted to a relatively large degree is applied onto the installation surface 80, and the installation surface 8
The spacer 82 was arranged on the outer peripheral portion on the top of the zero. Spacer 8
2 used what was manufactured from the processed wood. Spacer 82
Does not swell or lose strength due to water absorption,
Any material can be used as long as the material can sufficiently withstand the pressure of the brick. For example, waterproofed wood, metal, or a brick made of the same material as the structure under construction can be used. After arranging the required number of spacers 82 processed to the same thickness as the predetermined joint thickness, the spacers 82 were installed while being precisely fine-tuned at the positions previously adjusted. By using the spacer 82, it is possible to prevent mortar shrinkage due to reduction when the upper refractory aggregate is installed and mortar hardening during construction work. Therefore, a predetermined joint thickness and mortar adhesive strength can be secured. Furthermore, continuous construction of brickwork is possible. The spacer 82 was pulled out about 1 hour after the upper refractory assembly was installed, and was jointed and pressed. The removal of the spacer may be performed at the time of fresh drying when the mortar has developed strength enough to withstand the applied load. In addition, if a brick made of the same material as the brick under construction is used as the spacer, and the mortar is sufficiently distributed all around the spacer, the spacer may be left as it is.

The operation of raising the volume of the refractory assembly was repeated several times to construct a coke oven combustion chamber row. The dimensional accuracy of the completed brickwork structure was maintained as designed and was a satisfactory performance. This furnace room is put into practical use after completion and fulfills its intended function.

[0034]

According to the present invention, by using a refractory unit which is easy to manufacture and handle by an operator, a refractory assembly corresponding to the size and shape of the dismantled portion and the remaining portion is formed. Since it was manufactured outside the furnace, the refractory assembly could be easily and accurately manufactured, and the time required for the furnace operation was reduced. Therefore, the working environment of the workers has been greatly improved. In addition, since the dimensions and shapes of the dismantled part and the remaining part were reflected in the refractory aggregate, a furnace wall without steps was formed, and an increase in frictional resistance during coke extrusion could be suppressed.

In stacking the refractory aggregate,
Since the necessary number of spacers is used, the joint thickness is properly maintained even when installing heavy refractory aggregates,
The dimensional accuracy of the brickwork structure can be made extremely good.

[Brief description of the drawings]

FIG. 1 is a perspective view of a refractory assembly according to an embodiment.

FIG. 2 is a view showing an entire combustion chamber wall for performing hot transfer from a kiln opening.

FIG. 3 is a horizontal cross-sectional view of a kiln brick of a Carl still coke oven showing an embodiment.

FIG. 4 is a side view of a kiln brick.

FIG. 5 is a side view of a kiln brick.

FIG. 6 is a side view of a kiln brick.

FIG. 7 is an explanatory diagram of joint construction between refractory assemblies.

FIG. 8 is a conceptual sectional perspective view of a part of a coke oven furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Refractory assembly 12 Fuel gas / airway 14 Royfer brick 16 Binder brick 18 Front brick 20 Outlet 22 Flue 30 First stage of combustion chamber 32 Third stage of combustion chamber 34 Fifth stage of combustion chamber 36 Seventh stage of combustion chamber 38 9th stage of combustion chamber 40 11th stage of combustion chamber 42 13th stage of combustion chamber 44 15th stage of combustion chamber 17th stage of combustion chamber 48 19th stage of combustion chamber 50th stage of combustion chamber 21st stage 52 Horizontal flame channel 54 Fuel gas / Air port 56 Combustion chamber peephole 58 Ceiling 60 Combustion chamber 62 Carbonization chamber 64 Kiln mouth 66 Flue 68 Old and new brick joint 70 Joint 72 Non-transferred brick 74 Furnace wall brick 76 Furnace wall brick 80 Installation surface 82 Spacer 100 Coke oven 102 Coalization chamber 104 Combustion chamber 106 Heat storage chamber 110 Coal inlet 112 Combustion chamber viewing hole 120 Fuel gas pipe 1 2 air 124 air 125 fuel gas 126 upper horizontal flame path 128 gas 130 small flame path 132 large flame path 136 chimney

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nozomi Tamura 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture Inside the Chiba Works, Ltd. (72) Inventor Shinya Shinde 4-1-1-17 Tsukiji, Chuo-ku, Tokyo Otto Corporation (72) Inventor Ken Osaki 4-1-17-1 Tsukiji, Chuo-ku, Tokyo Stock (72) Inventor Yoshiharu Sato 4-1-1, Tsukiji, Chuo-ku, Tokyo Inside Otto Corporation

Claims (3)

[Claims] In a method for repairing a coke oven, a wall body to be repaired is divided into a plurality of laminated portions, and a refractory assembly in which a plurality of bricks are combined in a shape corresponding to each laminated portion is formed outside the furnace, A method for repairing a coke oven, comprising: after disassembling and removing a wall repair portion of a coke oven, constructing a wall with the refractory assembly. 2. A method for repairing a coke oven, wherein a wall to be repaired is divided into a plurality of laminated portions, and a refractory assembly obtained by combining a plurality of bricks in a shape corresponding to the main portion of each laminated portion is formed outside the furnace. A method of repairing a coke oven, comprising: forming and removing a wall repair portion of a coke oven, and then combining the refractory assembly and a single brick to construct a wall. 3. The method for repairing a coke oven according to claim 1, wherein a spacer is arranged on a joint of the refractory aggregate, and the joint is placed by placing the upper refractory aggregate on the spacer. A method of repairing a coke oven characterized by being constructed.