JP2016079264A - Gas leakage prevention structure for sole flue portion of coke oven and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas leakage prevention structure and a method for constructing the same in a sole flue portion of a coke oven which can cope with both joint breakage of a depth joint in a vertical direction and joint breakage of a transverse joint in a horizontal direction of a partition wall in a sole flue portion of a coke oven.SOLUTION: A brick structure of a fuel gas sole flue 3, an air sole flue 4, and a partition wall 5 of a coke oven has a seal joint 6 which is a single vertical plane and extends in an incinerator length direction, and has a metal plate (seal plate 7) arranged in the seal joint. Thereby, even when joint breakage occurs in any one of a transverse joint 31 and a depth joint 32 of the partition wall 5, flowing of gas and air can be prevented. The brick structure of the partition wall 5 is two-column stacking with the seal joint 6 interposed therebetween, and the brick having such a shape as to bind both of the two-column stacked bricks is arranged in one or both of the upper end and the lower end of the two-column stacked bricks. Thereby, the strength of the partition wall can be secured.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas leakage prevention structure of a coke oven sole flue portion and a construction method thereof.

  In the coke oven, the carbonization chambers and the combustion chambers are alternately arranged in the upper stage in the upper stage, the heat storage chamber is arranged in the middle stage, and the lower stage is the sole flue section. The heat storage chamber is disposed corresponding to the carbonization chamber and the combustion chamber. In the sole flue portion, a fuel gas sole flue and an air sole flue are arranged corresponding to each heat storage chamber, and each constitutes a space extending in the furnace length direction. The partition walls of the fuel gas sole flue and the air sole flue corresponding to each heat storage chamber are hereinafter referred to as “partition walls”.

  At the stage of supplying fuel gas and air to the heat storage chamber, normal temperature fuel gas flows through the fuel gas sole flue, and normal temperature air flows through the air sole flue. When exhaust gas is discharged from the heat storage chamber, high-temperature (about 300 ° C.) exhaust gas flows through the fuel gas sole flue and the air sole flue.

  Silica brick is mainly used as the furnace material that constitutes the coke oven. This is because quartz brick has high mechanical strength at a high temperature region of 1000 ° C. or higher and a small volume change at a high temperature region of 1000 ° C. or higher. However, since the volume change in the low temperature region is large, silica brick cannot be used in locations where the temperature change is severe in the low temperature region, and clay brick is used in such locations (see Non-Patent Document 1).

  As described above, the temperature change in the low temperature region is severe because the sole flue gas flows at the normal temperature and the high temperature exhaust gas alternately. Therefore, silica brick cannot be used, and the clay brick is used for the part facing the sole flue, including the partition wall.

  When the construction of the coke oven brick is completed, the coke oven is heated to a high temperature and the coke oven operation is started. Looking at the amount of thermal expansion from room temperature to high temperature, clay bricks have a smaller expansion rate than quartz bricks, so that joint breakage occurs in the joints of brick structures constructed with clay bricks when the coke oven is heated. There is. When joint breakage occurs in the partition wall between the fuel gas sole flue and the air sole flue, the fuel gas and the air are mixed in the air sole flue through the joint break and the fuel gas and air are mixed. Therefore, the furnace temperature is lowered and the furnace body is damaged. Furthermore, there has been a problem that fuel gas leaks into the air and ignites.

  In Patent Document 1, a self-propelled carriage is run in the space of the sole flue, the leaking gas joint burned portion is detected by a temperature sensor, and the sole flue portion is automatically repaired by spraying mortar on the detected joint cut portion. The invention is disclosed. This treatment is carried out at the initial stage after the construction of the coke oven, and it is essential to stop the gas at the sole flue part to be repaired. Repairs must be performed in time, and the coke oven operation must be performed with the operating rate lowered until the repair of all sole flue is completed.

  In Patent Document 2, in a coke oven heated by lean gas, a part of the lean gas flowing in the regenerator enters a nearby exhaust gas duct (another chamber in the regenerator) due to cracks in the regenerator separation wall. An invention for preventing the phenomenon is disclosed. In the embodiment shown in FIG. 1 of the same document, a stainless steel sheet is provided on the surface of the regenerator separating wall. Since the sheet is exposed on the surface, there are problems in the workability and durability of the sheet. In the embodiment shown in FIGS. 2 to 5, in the regenerator separating wall, an airtight foil is provided as a seal by providing a vertical seam behind the rectangular brick.

  The invention described in Patent Document 3 is a coke oven battery including a coking chamber and a furnace body roof portion. The roof portion has a screen that does not leak gas, and the screen has a horizontal portion and a vertical portion. .

JP-A-7-278554 JP-A-8-218073 JP 59-93789 A

Third Edition Steel Handbook II Steelmaking / Steelmaking Pages 179-180

  The partition wall (partition wall) between the fuel gas sole flue and the air sole flue is constructed by stacking rectangular bricks. A horizontal joint (hereinafter also referred to as “laying joint”) and a vertical joint (hereinafter also referred to as “back joint”) are formed on the partition wall surface viewed from the sole flue. In the mode shown in FIGS. 2 to 5 of Patent Document 2, an airtight foil is provided in a vertical seam behind a rectangular brick (hereinafter, also referred to as “longitudinal joint”) in the heat accumulator separation wall to provide a seal. As a result, it is possible to prevent gas leakage due to the joint breakage in the back joint. However, joint breaks in which gas and air circulate occur not only in the back joints but also in the horizontal joints (joint joints). However, the seal described in Patent Document 2 cannot play the role of a seal that prevents the circulation of gas and air when joint breakage occurs in the horizontal joint.

  An object of the present invention is to provide a gas leakage prevention structure and a method for constructing the same that can cope with both joints at the back joints of joint walls and joints at joints in the coke oven sole flue. To do.

  The present invention is disposed in the lower part of the combustion chamber and the carbonization chamber of the coke oven, and is based on the side preheating gas or air (referred to as the preheating side) and the combustion in the combustion chamber by the heat accumulated in the brick every 15 to 30 minutes. In a coke oven with a combustion mechanism in which the sensible heat of the high-temperature exhaust gas is transferred to the bricks in the heat storage chamber and stored, and the exhaust gas that has been cooled down is discharged (referred to as the exhaust gas side). In the state of the side, the gas leakage prevention structure of the coke oven sole flue portion in the brick structure of the fuel gas sole flue and air sole flue partition wall (hereinafter referred to as "partition wall") of the coke oven that introduces fuel gas and air About.

That is, the gist of the present invention is as follows.
(1) The brick structure of the partition wall (partition wall) between the fuel gas sole flue and the air sole flue has a joint (hereinafter referred to as “seal joint”) that is a single vertical plane and extends in the furnace length direction. A gas leakage prevention structure for a coke oven sole flue, wherein a metal plate (hereinafter referred to as a “seal plate”) is disposed in the seal joint.
(2) To prevent the spread of the seal joint, the brick structure of the partition wall is stacked in two rows across the seal joint, and one or both of the upper and lower ends of the two-row brick are made of two-row bricks. The gas leakage prevention structure for a coke oven sole flue as described in (1), wherein bricks having a shape that restrains both are disposed.
(3) The seal plate is composed of a plurality of metal plates in the furnace length direction, adjacent metal plates in the furnace length direction are in contact with each other, and the metal plate is bent in an L shape at the end of the furnace length direction. The structure according to (1) or (2), wherein the bent portion is in contact with a corner portion of the brick.
(4) The seal plate is composed of a plurality of metal plates in the furnace height direction, the metal plates adjacent to each other in the furnace height direction are in contact with each other, and the metal plate is bent in an L shape at the end of the furnace height direction. The coke oven sole flue portion according to (3), wherein the bent portion is in contact with a corner portion of the brick, and the thickness of the seal plate is 0.25 mm to 0.6 mm. Gas leak prevention structure.
(5) Brick one side of the two-layer bricks of the partition wall, apply mortar on one side of the seal plate and set the seal plate on the brick, and then place the other side of the two-layer brick The method for constructing a gas leakage prevention structure for a coke oven sole flue as set forth in (4), wherein brick building is performed.

  In the brick structure of the partition wall between the fuel gas sole flue and the air sole flue of the coke oven, the present invention has a seal joint extending in the furnace length direction on a single vertical plane, and a metal plate ( By disposing the seal plate), it is possible to prevent gas and air from flowing even if joint breakage occurs in either the joint of the partition wall or the back joint. The brick structure of the partition wall is stacked in two rows across the seal joint, and a brick that is shaped to constrain both the two-layer stack bricks is placed on one or both of the upper and lower ends of the two-layer brick. The strength of the can be ensured.

It is a figure which shows an example of the sole flue part of this invention, (a) is a thickness cross section, (b) is a horizontal cross section (BB arrow cross section). It is a figure which shows the seal joint cross section (AA arrow cross section of FIG. 1) of the sole flue part partition wall of this invention, (a) is a joint structure, (b) is a figure which shows the arrangement | positioning condition of a seal board. . It is a fragmentary figure which shows the thickness cross section of the partition wall of this invention. It is a fragmentary figure which shows the edge part horizontal cross section of the partition wall of this invention. It is a figure which shows the conventional sole flue part. It is a figure which shows the seal joint cross section of the sole flue part partition wall in the Example of this invention, (a) is furnace full length direction full length, (b) is a BB partial enlarged view, (c) is CC partial expanded. FIG.

  FIG. 1 shows the present invention, and FIG. 5 shows a conventional sole flue. As described above, the partition walls of the fuel gas sole flues 3 and the air sole flues 4 corresponding to the respective heat storage chambers 2 are referred to as “partition walls 5”. As described above, clay bricks are used as the refractories in the portions facing the gas passages of the fuel gas sole flue 3 and the air sole flue 4. As for the partition wall, the entire thickness direction is constructed of clay bricks. In FIGS. 1 and 5, the hatched portion of the cross section is a silica brick 35, and the dot hatched portion is a clay brick 36.

  Regarding the shape of the brick constituting the partition wall 5, the length 42 in the thickness direction of the partition wall 5 in the brick is “brick thickness 45”, the length in the height direction 43 is “brick height 46”, and the length in the furnace length direction 41. This is referred to as “brick width 47” (see FIG. 1).

  FIG. 5 is a cross-sectional view of the sole flue portion, showing a conventional brick building structure, in particular, a partition wall portion. In the drawing, a cross section (hereinafter referred to as “thickness cross section”) showing the thickness direction 42 of the partition wall 5 is shown. Two kinds of bricks having different brick thicknesses 45 are used in the thickness direction 42 of the partition wall 5, and bricks having a large brick thickness and small bricks are alternately arranged in the height direction. As a result, as for the joints seen in the thickness section of the partition wall 5, the horizontal joints (the joints 31) penetrate in the thickness direction, and the vertical joints (the vertical joints 33) are bricks in the height direction. It will be alternately arranged for each stage. In such a brickwork structure, as described in Patent Document 2, when a seal is provided on the vertical seam (vertical joint 33) behind the rectangular brick, the position of the seal differs for each brickwork stage in the vertical direction, It is not possible to provide a continuous seal in the vertical direction. Therefore, when a joint break is formed in the joint 31 in the thickness section, the arranged seal is not useful, and the gas flows through the partition wall 5.

  In the present invention, as shown in FIG. 1, a brick structure having a joint (seal joint 6) that is a single vertical plane and extends in the furnace length direction is used as the brick structure of the partition wall 5. . The brick structure of the partition wall is stacked in two rows with the seal joint 6 in between. In the two-row stacking, the air sole flue side row is called “air side row 9”, and the fuel gas sole flue side row is called “gas side row 8”. The partition wall thickness sectional view of FIG. 1A and the horizontal section (hereinafter referred to as “horizontal section”) of the partition wall of FIG. 1B will be described. In the thickness section, the bricks 45 stacked on the air side row 9 and the gas side row 8 of the partition wall have the same brick thickness 45. Thus, the vertical joints formed by the two rows of bricks do not alternate in the height direction, but form a single vertical plane. Further, in the horizontal section, the bricks arranged in the furnace length direction 41 in the air side row 9 and the gas side row 8 have the same brick thickness 45. Accordingly, the vertical joints (seal joints 6) formed by the two rows of bricks are not staggered in the furnace length direction 41, and form a shape in which a single vertical plane extends in the furnace length direction. .

  Thus, the seal joint 6 of the present invention formed inside the partition wall 5 extends in the height direction 43 as the same vertical plane and also extends in the furnace length direction 41 as the same vertical plane. Both the direction 43 and the furnace length direction 41 form one wide plane. In the present invention, a metal plate (seal plate 7) is disposed in the seal joint 6. As the metal plate of the seal plate 7, a stainless steel plate or a plated steel plate is preferably used from the viewpoint of durability and corrosion resistance.

  In FIG. 2, the cross section (seal joint cross section) which cut | disconnected the partition wall with the seal joint is shown. In this figure, the hatched part is a cross section of a brick, and the hatched part is a seal joint. The horizontal joint visible on the seal joint cross-section is the same as the horizontal joint visible on the thickness cross-section, and is referred to herein as the “seed 31”. When a joint cut that penetrates in the thickness direction of the partition wall is formed in such a joint 31, gas leakage is conventionally formed through the partition wall. In the present invention, since the seal plate 7 is disposed on the seal joint 6, the penetration of the joint break is blocked at the seal joint portion, and gas leakage due to the joint break of the joint joint 31 can be prevented. Further, the vertical joint visible on the seal joint cross section is the same as the joint in the thickness direction on the horizontal cross section, and is referred to herein as “back joint 32”. The seal plate 7 can also prevent gas leakage even with respect to the joint breakage formed in the back joint 32.

  Conventionally, as shown in FIG. 5, the bricks of the partition walls are stacked alternately with bricks having different thicknesses in the height direction in the thickness cross section, and thereby vertical joints (here, “longitudinal joints 33” that can be seen in the thickness cross section. ”) Has adopted a structure that is stepped up and down. Thereby, the intensity | strength of the partition wall was hold | maintained. In the present invention, the vertical joints are not stepped in the vertical direction, and the seal joints 6 are formed. The brick structure of the partition wall is separated as a two-layer stack with the seal joints 6 in between. Therefore, new consideration is required to secure the strength of the partition wall.

  In the present invention, bricks having a shape that restrains both the two-row bricks (air side row, gas side row) are arranged on one or both of the upper and lower ends of the two-row bricks, and the strength of the partition wall It was decided to secure. This will be described with reference to FIG. Each of the two upper end bricks (15 a, 15 b) of the partition wall has a protrusion 19 at the upper part in a portion in contact with the seal joint 6. An upper restraining brick 16 is disposed on the upper end brick. The upper constraining brick 16 has a recess 20 in the central portion in the thickness direction of the lower portion. In the brickwork, the projections 19 of the two upper end bricks 15 are fitted into the recesses 20 of the upper restraining brick 16 together. Thereby, since the two upper end bricks 15 are restrained even if trying to leave each other, they are not separated and the strength of the upper end portion of the partition wall 5 is maintained. In the example of FIG. 3, each of the two lower bricks (17 a, 17 b) of the partition wall 5 has a protrusion 19 at the lower portion at a portion in contact with the seal joint 6. A lower constraining brick 18 is disposed below the lower end brick 17. The lower constraining brick 18 has a recess 20 at the center in the thickness direction of the upper part. In the brickwork, the projections 19 of the two lower end bricks 17 are fitted into the recesses 20 of the lower restraining brick 18 together. Thereby, since the two lower end bricks 17 are restrained even if it tries to leave | separate from each other, they are not separated but the intensity | strength of the lower end part of the partition wall 5 is maintained. As described above, it is most preferable to arrange bricks having a shape that restrains both the two-row bricks on both the upper end and the lower end of the two-row bricks. However, both the two-row bricks are restrained only on one of the upper and lower ends. It is good also as arrange | positioning a brick of a shape.

  The partition wall 5 has a shape with a height of about 800 mm and a length in the furnace length direction of about 16 m. The seal joint according to the present invention is also preferably disposed throughout the height and length of the partition wall. In this case, regarding the metal plate (seal plate) arranged on the seal joint, if it is attempted to form the whole with a single metal plate, there will be difficulties in both the preparation and construction of the material.

  In the present invention, the seal plate is preferably composed of a plurality of metal plates. In FIG. 2 (b), the outlines of the individual metal plates are indicated by the bold one-dot chain line and the two-dot chain rectangle. The individual metal plates are preferably about 1750 mm in the furnace length direction and about 800 mm in the height direction in terms of both workability and cost.

  In the present invention, preferably, first, the seal plate 7 is composed of a plurality of metal plates in the furnace length direction 41. In FIG. 2B, the seal plate 7a and the seal plate 7b are arranged in the furnace length direction. Thereby, the problem that each seal plate 7 becomes excessively long in the furnace length direction 41 can be solved. In order to sufficiently exert the sealing effect, the metal plates adjacent in the furnace length direction are in contact with each other with an overlap. In FIG. 2B, the seal plate 7a and the seal plate 7b form an overlapping portion 21a1. The furnace length direction end of each metal plate is preferably arranged so as not to coincide with the position of the back joint 32 of the brickwork.

  When the temperature is raised after the construction of the coke oven is completed, the refractory expands due to thermal expansion. In the case of a coke oven having a length in the furnace length direction of 16 m, the length from the furnace core to the end in the furnace length direction expands by about 64 mm. The end brick in the furnace length direction moves by the same length as the enlargement margin from the furnace core to the end. This length is called the “end brick movement”. The seal plate is also preferably moved when the position of the end portion in the furnace length direction accompanying the expansion is changed because the occurrence of a seal failure can be prevented. In the present invention, as shown in FIG. 4, the metal plate as the seal plate 7 has an L-shaped bent portion 22 at the end in the furnace length direction, and the bent portion 22 is in contact with the corner portion 25 of the brick. Placement is preferred. Since the metal plate is restrained by the brick by the L-shaped bent portion 22, when the brick at the end in the furnace length direction moves outward due to thermal expansion, the metal plate also moves outward along with it. In this case, regarding the initial overlap between the metal plate at the furnace length direction end and the metal plate at the furnace back side in contact with the metal plate at the furnace length end, a sufficient initial overlap that does not eliminate the overlap even if the metal plate at the furnace length end is moved. It is good to provide. By setting the initial overlap of the metal plates to a size obtained by adding 10 mm to the end brick movement amount, it is possible to sufficiently prevent the metal plates from overlapping even after thermal expansion.

  In the present invention, next, the sealing plate is constituted by a plurality of metal plates in the height direction 43. In FIG. 2B, the seal plate 7a and the seal plate 7c are arranged in the height direction. Thereby, since an upper part side and a lower part side can be separately constructed | assembled in the height direction of a seal joint, construction becomes easy. It can cope with brick thermal expansion in the vertical direction. In order to sufficiently exert the sealing effect, the metal plates adjacent in the furnace height direction are in contact with each other with an overlap. In FIG. 2B, the seal plate 7a and the seal plate 7c form an overlapping portion 21a3. It is preferable to arrange the vertical ends of the metal plates so as not to coincide with the positions of the brickwork joints 31.

  Similar to the furnace length direction end, as shown in FIG. 3, the metal plate has an L-shaped bent portion 23 at the furnace height direction end, and the bent portion 23 is arranged so as to be in contact with the corner of the brick. preferable. Thereby, the workability of seal plate arrangement in brickwork is improved. Moreover, since the metal plate is restrained by the brick by the L-shaped bent portion, the metal plate also moves accompanying the thermal expansion in the height direction.

  In the overlap portion 21 of the seal plates, the total thickness of the seal plates 7 is a value obtained by multiplying the thickness of each seal plate by the overlap number. In the present invention, the thickness of the seal plate is preferably 0.2 mm or more and 0.6 mm or less, and the overlap of the seal plates is 3 or less. The joint width of the seal joint is preferably 4 mm or less. Normally, the joint strength is weaker than the brick strength, so the joint thickness should be as small as possible locally. However, if the partition wall is 4 mm or less, the strength of the coke oven will decrease. There is no impact. And in order to ensure the adhesive force in a joint, it is preferable to ensure the mortar thickness to 2 mm or more. In order to make the mortar thickness at the overlapping portion of the seal plate 2 mm or more at the joint of 4 mm, the thickness of the seal plate may be 0.6 mm or less and the overlap of the seal plates may be three or less. As shown in FIG. 2B, when both the height direction 43 and the furnace length direction 41 divide the seal plate 7, the furnace length direction overlapping portion of the upper seal plate and the furnace length direction of the lower seal plate By arranging the overlapping portion at a different position in the furnace length direction, the overlapping of the seal plates can be reduced to three or less. In the example shown in FIG. 2B, the upper furnace length direction double overlap portion 21a1 and the lower furnace length direction double overlap portion 21a2 are arranged at different positions in the furnace length direction. As a result, the three overlapping portions (21b1, 21b2) are formed at different locations, and the four overlapping portions are not formed. If the thickness of the seal plate 7 is too thin, workability and durability are lowered. Therefore, the thickness of the seal plate is preferably 0.2 mm or more.

  On the other hand, when joint thickness exceeds 6 mm, there exists a possibility of affecting the intensity | strength of the whole coke oven. However, even when the manufacturing accuracy of the brick of about 2 mm and the variation in the furnace building accuracy are taken into consideration, the joint thickness can be reduced to 6 mm or less if the thickness of the seal plate is 0.6 mm or less.

  Preferably, in the construction of the partition wall according to the present invention, one of the two-layer bricks of the partition wall (for example, the air side row 9 in the example shown in FIG. 3) is first bricked. Next, mortar is applied to one side of the seal plate 7 and the seal plate is set on the bricks of the air side row 9 in which the seal plates are bricked. The seal plate is divided into two vertically divided metal plates, an L-shaped bent portion 23 is formed at the upper end of the upper metal plate 7a, and an L-shaped bent portion 23 is formed at the lower end of the lower metal plate 7b. About the lower metal plate 7c, it arrange | positions so that it may face to the opposite side of the brick row which L shape constructed, and about the upper metal plate 7a, it arrange | positions so that it may face the direction of the brick row which constructed. . Thereby, a metal plate can be constructed easily. Thereafter, the other side of the two-row brick (here, the gas side row 8) is bricked.

  The present invention was applied to a coke oven having a furnace height of 5.5 m and a furnace length of 15.7 m and a sole flue height of 700 mm and a sole flue length of 15.7 m. As shown in FIG. 1, the brick structure of the partition wall 5 was a brick structure having a joint (seal joint 6) that is a single vertical plane and extends in the furnace length direction. As shown in FIG. 3, each of the two upper bricks (15a, 15b) of the partition wall has a protrusion 19 at the upper part at the part in contact with the seal joint 6, and the lower thickness direction at the upper part of the upper brick. An upper restraining brick 16 having a recess 20 at the center is disposed. The projections 19 of the two upper end bricks 15 are fitted into the recesses 20 of the upper restraining brick 16 so that the two upper end bricks 15 are restrained even if they are separated from each other. The strength of the upper end is maintained. Each of the two lower bricks (17a, 17b) of the partition wall 5 has a protrusion 19 at the lower part at the part in contact with the seal joint 6, and a concave part at the central part in the thickness direction of the upper part at the lower part of the lower brick 17. A lower restraining brick 18 having 20 is arranged. Since the projections 19 of the two lower bricks 17 are fitted into the recesses 20 of the lower constraining brick 18, the two lower bricks 17 are restrained even if they are separated from each other. The strength of the lower end is maintained.

  On the seal joint 6, the seal plate 7 is divided into two parts in the furnace height direction and 11 parts in the furnace length direction. As the seal plate 7, a plated steel plate having a thickness of 0.3 mm was used. As shown in FIG. 4, the metal plate as the seal plate 7 has an L-shaped bent portion 22 at the end in the furnace length direction, and the bent portion 22 is arranged so as to be in contact with the corner portion 25 of the brick. As shown in FIG. 3, the metal plate has an L-shaped bent portion 23 at the end in the furnace height direction, and the bent portion 23 is disposed so as to contact the corner portion of the brick. Thereby, the restraint for spread prevention was provided.

  FIG. 6 shows a seal joint cross section of the sole flue partition wall in the embodiment. 6A is a full length in the furnace length direction, FIG. 6B is an enlarged view of the BB portion, and FIG. 6C is an enlarged view of the CC portion. In FIG. 6, the outlines of the individual seal plates 7 are indicated by the bold, dashed-dotted rectangles. The seal plate divided into two in the furnace height direction is depicted as an upper seal plate 7U and a lower seal plate 7L. The upper sealing plate has an 11-sheet configuration from 7U1 to 7U11, and the lower sealing plate has a 10-sheet configuration from 7L1 to 7L10. Two overlapping portions 21a are formed in the overlapping portion (overlapping width 50 to 200 mm) of the seal plates adjacent in the furnace length direction 41 and are indicated by hatching. Two overlapping portions 21a are formed in the overlapping portion (overlap width 86 mm) of the seal plates adjacent in the furnace height direction 43, and are indicated by hatching. The three overlapping portions 21b are indicated by a cross hatch. The furnace length direction end of each seal plate was arranged so as not to coincide with the position of the back joint 32 of the brickwork. Further, the lower end portion of the upper seal plate 7U and the upper end portion of the lower seal plate 7L were arranged so as not to coincide with the position of the brickwork mating 31 (see FIG. 2B).

  When the coke oven of the example was started up, no gas leakage between the fuel gas sole flue and the air sole flue was observed. As a result, the repair work of the sole flue carried out at the initial stage of the start-up could be omitted. As a result, it was possible to operate without reducing the operating rate from the beginning of startup.

DESCRIPTION OF SYMBOLS 1 Sole flue part 2 Thermal storage chamber 3 Fuel gas sole flue 4 Air sole flue 5 Partition wall 6 Seal joint 7 Seal plate 8 Gas side row 9 Air side row 10 Sole flue rising part 11 Horizontal flue hardware 12 Pillar wall 15 Upper end brick 16 Upper restraint brick 17 Lower end brick 18 Lower restraint brick 19 Protrusion 20 Recess 21 Overlapping portion 21a Two overlapping portions 21b Three overlapping portions 22 Folding portion 23 Folding portion 25 Corner portion 31 Mattress 32 Back joint 33 Vertical joint 35 Silica brick 36 Clay Brick 37 Clay brick 38 Silica brick 41 Furnace length direction 42 Thickness direction 43 Height direction 45 Brick thickness 46 Brick height 47 Brick width

Claims (5)

  In a brick structure of fuel gas sole flue and air sole flue bulkhead (hereinafter referred to as “partition wall”), a joint (hereinafter referred to as “seal joint”) that is a single vertical plane inside the wall thickness direction and extends in the furnace length direction. And a metal plate (hereinafter referred to as “seal plate”) is disposed in the seal joint, and the coke oven sole flue gas leakage prevention structure is provided.   The brick structure of the partition wall of the coke oven having the seal plate in the seal joint is stacked in two rows across the seal joint, and one or both of the upper end and the lower end of the two-row stack brick are made of two-row brick. 2. The gas leakage prevention structure for a coke oven sole flue portion according to claim 1, wherein bricks having a shape constraining both are disposed.   The seal plate is composed of a plurality of metal plates in the furnace length direction, adjacent metal plates in the furnace length direction are in contact with each other with overlap, and the metal plate has an L-shaped bent portion at the end of the furnace length direction. The gas leakage prevention structure for a coke oven sole flue portion according to claim 1 or 2, wherein the bent portion is in contact with a corner portion of the brick.   The seal plate is composed of a plurality of metal plates in the furnace height direction, adjacent metal plates in the furnace height direction are in contact with each other, and the metal plate has an L-shaped bent portion at the end of the furnace height direction. 4. The gas leakage prevention of the coke oven sole flue portion according to claim 3, wherein the bent portion is in contact with a corner portion of the brick, and the thickness of the seal plate is 0.2 mm or more and 0.6 mm or less. Construction.   Brick one side of the two-layer bricks of the partition wall, apply mortar to one side of the seal plate and set the seal plate to the bricks, and then brick the other side of the two-layer bricks The construction method of the gas leakage prevention structure of the coke oven sole flue part according to claim 4.

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