JP3697480B2 - Coke oven door seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing structure at a furnace lid position of a coke oven, and relates to a door seal structure for a coke oven having an opening for a small lid such as an opening of a charging coal leveler in the furnace lid.
[0002]
[Prior art]
In a coke oven, if the furnace lid is poorly sealed, it will adversely affect the working environment of the coke oven and cause damage to the furnace wall. For this reason, various improvements have been made to the method for sealing the furnace lid, including measures for increasing the size of the furnace body.
[0003]
Then, a conventional door seal structure will be described by taking a furnace lid mounted on the extruder side of the coke oven carbonization chamber as an example. As shown in FIG. 7, the seal plate 51 abuts on the furnace body side surface of the furnace lid 50. A knife edge 52, which is a metal seal, is provided along the outer periphery of the furnace lid 50. The knife edge 52 is pressed against the furnace body frame 53 by a presser spring, thereby ensuring a predetermined hermeticity between the furnace body and the furnace lid 50, that is, at the outer periphery of the furnace lid 50.
[0004]
In addition, an opening 54 for charging coal leveling opening is formed in the upper portion of the furnace lid 50, and air cooling is performed on the outer surface side of the furnace lid 50 in the opening 54 via a small lid opening 56. A small lid 55 of the type is attached. Then, in order to prevent gas leakage or inhalation of outside air at the opening 54 for the small lid port 56, the seal plate 51 in the vicinity of the opening 54 is moved to the furnace lid 50 side by the fixing plates 57 and 58. It is fixed by pressing.
[0005]
The fixing plates 57 and 58 are disposed on the entire circumference along the circumferential direction of the opening 54, and have an upper fixing plate 57 and a small lid inner frame 59 for forming a leveling opening. It is separated from the lower fixing plate 58.
[0006]
As shown in FIG. 8, the conventional upper fixing plate 57 is composed of a single elongated plate-like member disposed along the upper side of the opening 54, and a plurality of bolt holes 57a are formed along the longitudinal direction thereof. It has been established. Then, the bolt hole 57a of the upper fixing plate 57 and the bolt hole penetrating the seal plate 51 and the furnace lid 50 main body are coaxially passed through the mounting bolt 60 and bolted, whereby the seal plate 51 is secured to the furnace lid 50. It is fixed to the surface.
[0007]
Further, as shown in FIG. 9, the conventional lower fixing plate 58 has a main body 58a formed in a U shape in a front view along the circumferential direction of the opening 54, and the furnace body 9 side along the main body 58a. A small lid inner frame 59 is formed so as to overhang. A main body 58a protrudes below the small lid inner frame 59 in a portion along the lower side of the opening 54, and a plurality of bolt holes 58b penetrates the extending portion along the extending direction. Has been established to do. In addition, a plurality of bolt holes 58 c opened to the furnace lid 50 side are provided in portions along the left and right sides of the opening 54. The bolt hole 58c is a bottomed hole formed inside the fixed plate main body 58a and the small lid inner frame 59, and a female screw is engraved in the bolt hole 58c.
[0008]
Then, the lower fixing plate 58 is bolted to the surface of the furnace lid 50 via the seal plate 51 so that the bolt 61 is passed from the furnace lid 50 side, and thus the seal plate 51 is disposed on the furnace body side of the furnace lid 50. Fixed to the surface.
[0009]
In this way, the seal plate 51 portion positioned on the outer periphery of the opening 54 is fixed by the upper fixing plate 57 and the lower fixing plate 58 so as to ensure the sealing of the door at the small lid port 56 portion.
[0010]
[Problems to be solved by the invention]
However, since the inside of the coke oven is heated to 1000 ° C. or more during the carbonization, the upper fixing plates 57 and 58 located in the carbonization chamber are directly affected by the heat distortion, particularly in the longitudinal direction. Since the amount of thermal expansion is large, a large shearing force acts on the mounting bolt 60, particularly the mounting bolt located at the end. The bolt 60 may be damaged due to repeated application of this large shearing force. If the bolt 60 is damaged, problems such as the outside air entering the furnace through the bolt hole 57a and the combustion temperature rising abnormally occur. To do.
[0011]
Further, when the bolt 60 is broken and pulled out, the press by the fixing plate 57 is weakened, the seal plate 51 is lifted from the furnace cover 50, and the outside air enters from the floating portion.
[0012]
Further, since the small lid inner frame 59 is provided on the lower fixing plate 58, a part of the bolt holes 58 c cannot penetrate the lower fixing plate 58. That is, as described above, since a female screw is engraved in the bottomed bolt hole 58c and is bolted by an implantable type, when the mounting bolt 61 is broken, the shaft portion of the bolt 61 remains in the bolt hole 58c. There is a problem that it takes time to repair bolts.
[0013]
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a coke oven door seal structure that can improve the life of fixing a seal plate by a fixed plate.
[0014]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a door seal structure for a coke oven according to claim 1 of the present invention has a seal plate abutting against the furnace body side surface of the furnace lid in which an opening for a small lid is opened, The outer periphery of the lid is sealed with a metal fitting such as a knife edge, and the fixing plate is brought into contact with the seal plate of the opening for the small lid from the furnace body along the opening. In the coke oven door seal structure that secures the sealing of the opening for the small lid by bolting the plate to the furnace lid across the seal plate,
The fixing plate is composed of a plurality of divided pieces divided along the circumferential direction of the opening, and the ends of the adjacent divided pieces are arranged in the thickness direction with a gap in the dividing direction. It is characterized by overlapping.
[0015]
In the present invention, by dividing the fixed plate in the circumferential direction of the opening, that is, along the longitudinal direction, the total thermal expansion amount generated in the fixed plate is divided into a plurality of divided pieces, and between adjacent divided pieces. It is possible to absorb the thermal expansion by providing a gap. As a result, the divided pieces are prevented from receiving stress in the dividing direction due to the amount of thermal expansion from the adjacent divided pieces. As a result, the shearing force applied to the bolt by thermal expansion is reduced.
[0016]
Furthermore, by adopting a structure in which the ends of adjacent divided pieces are overlapped in the plate thickness direction, even if a gap in the dividing direction is provided between adjacent divided pieces, the integrity as a fixed plate is ensured, and the divided pieces are divided. It is possible to avoid a reduction in the pressing force on the seal plate at the position between the one side.
[0017]
As described above, the gap is formed between the divided pieces. However, since the fixing plate suppresses the seal plate, there is no communication between the gap and the outside air. On the other hand, when this structure is adopted for the sealing member itself provided on the outer peripheral portion of the furnace lid, there is a risk of the outside air flowing in and out from the joint portion of the split pieces.
[0018]
Next, the invention described in claim 2 is a coke oven door seal structure provided with a small lid inner frame projecting to the furnace body side on a part of the fixed plate, with respect to the configuration described in claim 1.
The small lid inner frame is provided with an opening and a fixing plate mounting bolt hole penetrating from the surface on the furnace lid side of the fixing plate toward the opening.
[0019]
In this invention, in addition to the operation of the first aspect, even if a small lid inner frame is provided on a part of the fixing plate in order to form a leveling opening, all the bolt holes are made to be through holes. The bolt shaft can be passed through the bolt hole and bolted. For this reason, even if the bolt is broken, the shaft portion of the bolt in the bolt hole can be easily removed as in the prior art.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a coke oven door seal structure at a furnace lid position attached to the extruder side of the coke oven carbonization chamber will be described as an example.
[0021]
An opening 5 for the small lid 1 is formed in the upper portion of the furnace lid 3. As shown in FIG. 1, an air-cooled type is provided on the outside air side of the opening 5 via the small lid 1. The small lid 2 is attached.
[0022]
The basic configuration of the coke oven door seal structure of the present invention is the same as the conventional door seal structure described above.
That is, as shown in FIG. 2 when the furnace cover 3 is viewed from the furnace body 9 side, the seal plate 4 is in contact with the surface of the furnace cover 3 on the furnace body side. The seal plate 4 is a plate-like member that covers a portion that needs to be sealed, that is, a portion along the entire outer periphery of the furnace lid 3 and the vicinity of the opening 5 for the small lid 1.
[0023]
Furthermore, the knife edge 6 which is a metal seal | sticker is arrange | positioned on the outer periphery of the furnace lid 3 along the perimeter. The knife edge 6 is pressed toward the furnace body frame 7 by a presser spring, so that a predetermined hermeticity is secured between the furnace body 9 and the furnace lid 3, that is, the outer periphery of the furnace lid 3 main body. Yes. In FIG. 1, 10 indicates a dry distillation chamber.
[0024]
Further, in order to prevent gas leakage at the opening 5 for the small lid 1, the seal plate 4 that contacts the surface near the opening 5 is pressed against the furnace lid 3 side by the fixing plates 11 and 12. It is fixed.
[0025]
The fixing plates 11 and 12 are arranged on the entire circumference along the circumferential direction of the opening 5, and have an upper fixing plate 11 and a small lid inner frame 14 for forming a leveling opening. It is configured to be separated from the lower fixing plate 12.
[0026]
And the upper side fixing plate 11 in this Embodiment follows along the upper side of the opening part 5, as shown to Fig.3 (a) seen from the furnace lid 3 side, and FIG.3 (b) which is a side view seen from the up-down direction. That is, it is divided into three divided pieces 11a, 11b, and 11c along the longitudinal direction. And each divided piece 11a, 11b, 11c has a bolt hole 11d for attachment.
[0027]
The adjacent divided pieces 11a, 11b, and 11c, that is, the ends of the divided piece 11a at the center and the divided pieces 11b and 11c at the end can be engaged with each other as shown in FIGS. A step portion 11e is formed and overlapped in the plate thickness direction. However, a predetermined gap δ, for example, each gap of about 2 mm is provided in the portion facing in the longitudinal direction.
That is, the gap δ is set to an amount that can absorb the amount of thermal expansion of each of the divided pieces 11a, 11b, and 11c due to thermal strain.
[0028]
Further, as shown in FIG. 5 (a) seen from the side, FIG. 5 (b) seen from the upper side, and FIG. 5 (c) seen from the furnace lid 3 side, the lower fixing plate 12 has the main body 13 opened as described above. A small lid inner frame 14 is formed so as to be U-shaped in a plan view along the circumferential direction of the portion 5 so as to protrude toward the furnace body 9 along the main body 13. And this small lid inner frame 14 becomes U shape seeing from the furnace body side, and comprises a leveling mouth. Further, the main body portion 13a along the lower side of the opening 5 projects downward from the small lid inner frame 14, and a plurality of bolt holes 15 penetrating the projecting portion are opened.
[0029]
Further, a plurality of openings 16 for mounting bolts are provided at a predetermined pitch in the vertical direction in the small lid inner frame 14 portion along the left and right sides of the opening 5. And the bolt hole 17 for fixing plate attachment is formed so that it may each penetrate toward the said opening part 16 from the surface facing the furnace lid 3 of the lower side fixing plate 12. As shown in FIG.
[0030]
Then, the upper fixing plate 11 and the lower side are placed on the seal plate 4 that is in contact with the opening portion 5 for the small lid 1 via the packing 18 as shown in FIG. 6 as shown in FIG. The fixing plate 12 is abutted and bolted.
[0031]
That is, the upper fixing plate 11 is brought into contact with the surface of the furnace lid 3 on the furnace body 9 side through the seal plate 4, and the bolts provided on the upper fixing plate 11, the packing 18, the seal plate 4, and the furnace lid 3, respectively. The hole is coaxial, and the shaft portion of the bolt 20 is passed through from the furnace body side and fixed by screwing a nut. As a result, the seal plate 4 near the upper side of the opening 5 is pressed against the furnace lid 3 by the upper fixing plate 11.
[0032]
In addition, the lower fixing plate 12 is also brought into contact with the furnace body side surface of the furnace lid 3 through the seal plate 4, and bolt holes provided in the upper fixing plate 11, the packing 18, the seal plate 4, and the furnace lid 3, respectively. Is fixed by connecting the shaft of the bolt 21 from the furnace lid 3 (small lid port 1) side and screwing the nut. As a result, the seal plate 4 portions near the lower side and the left and right sides of the opening 5 are pressed against the furnace lid 3 by the lower fixing plate 12.
[0033]
In this manner, the seal plate 4 portion positioned on the outer peripheral portion of the opening 5 is fixed by the upper fixing plate 11 and the lower fixing plate 12 so as to ensure the sealing property at the small lid opening 1 portion.
[0034]
When dry distillation is carried out in this state, the inside of the dry distillation chamber reaches 1000 ° C. or more, and the upper fixing plate 11 expands by receiving the heat. At this time, the amount of expansion in the longitudinal direction is the largest, but in this embodiment, by dividing the upper fixing plate 11 into a plurality along the longitudinal direction, the total thermal expansion amount generated in the upper fixing plate 11 is plural. Since there is a gap δ between the divided pieces 11a, 11b, and 11c and the adjacent divided pieces 11a, 11b, and 11c, the expansion of each divided side is absorbed by the gap δ. Accordingly, it is possible to prevent stress in the dividing direction due to the amount of thermal expansion from the adjacent divided pieces 11a, 11b, and 11c. As a result, the shearing force applied to the bolt 20 due to thermal expansion is reduced, the bolt 20 is less likely to be broken than before, and the durability of the door seal is improved as compared with the conventional case.
[0035]
Further, since the end portions of the adjacent divided pieces 11a, 11b, and 11c are superposed in the thickness direction, even if a gap δ in the dividing direction is provided between the adjacent divided pieces 11a, 11b, and 11c. The integrity of the fixing plates 11 and 12 is ensured, and the reduction of the pressing force to the seal plate 4 at the position between the divided pieces 11a, 11b and 11c is prevented.
[0036]
Further, when the bolts 20 and 21 are damaged due to long-term use and the sealing performance is deteriorated, repair work such as replacement of the bolts 20 and 21 is required.
At this time, since the bolt 21 to which the lower fixing plate 12 is attached is not a conventional implantable type, even if the shaft portion of the bolt 21 is damaged, the damaged shaft portion is easier and faster than the conventional case. The lower fixing plate 12 can be attached with a new bolt.
[0037]
Here, in the above embodiment, a case where a part of the small lid inner frame 14 is provided is described, but the entire periphery is sealed with the fixing plates 11 and 12 similar to the upper fixing plates 11 and 12. In the case of a structure for fixing the plate 4, the above-described structure in which the fixing plates 11 and 12 on the entire circumference are divided into a plurality along the circumferential direction of the opening 5, that is, the longitudinal direction of the fixing plates 11 and 12, is adopted. That's fine.
[0038]
Further, the bolt holes opened in the upper fixing plates 11 and 12 are elongated holes with the longitudinal direction in the dividing direction, that is, the longitudinal direction, and the expansion amount is absorbed also by the elongated holes. , 12 may be reduced in shearing force applied to the bolt when it expands.
[0039]
【The invention's effect】
As described above, in the coke oven door seal structure of the present invention, even if the fixing plate for fixing the seal plate at the opening of the small lid opening portion is thermally expanded, it is loaded on the bolt for fixing the fixing plate. Shear force is reduced. For this reason, there exists an effect that durability of a door seal improves.
[0040]
Furthermore, when the invention described in claim 2 is adopted, even if the small cover inner frame is provided on the fixing plate, an effect that the replacement of the bolt for fixing the fixing plate can be performed more easily and quickly than before is obtained. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the vicinity of a small lid for explaining a door seal structure according to an embodiment of the present invention.
FIG. 2 is a view of the furnace lid according to the embodiment of the present invention as seen from the furnace body side.
3A and 3B are diagrams showing an upper fixing plate according to an embodiment of the present invention, in which FIG. 3A is a plan view seen from the furnace lid side, and FIG. 3B is a side view seen from the vertical direction.
FIG. 4 is a diagram showing a joining state of adjacent divided pieces according to the embodiment of the present invention.
5A and 5B are diagrams showing a lower fixing plate according to an embodiment of the present invention, wherein FIG. 5A is a side view, FIG. 5B is a top view, and FIG. 5C is a furnace lid. Each side view is shown.
FIG. 6 is a view showing a packing.
FIG. 7 is a cross-sectional view of the vicinity of a small lid for explaining a conventional door seal structure.
FIG. 8 is a view showing a conventional upper fixing plate.
9A and 9B are diagrams showing a conventional lower fixing plate, in which FIG. 9A is a side view, FIG. 9B is a top view, and FIG. 9C is a view from the furnace lid side. Show.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Small lid opening 2 Small lid 3 Furnace lid 4 Seal plate 5 Opening part 6 for small lid openings Knife edge 9 Furnace body 11 Upper fixed plate 11a, 11b, 11c
Divided piece 12 Lower fixing plate 14 Small lid inner frame 16 Opening 17 Bolt hole

Claims (2)

The seal plate is brought into contact with the furnace body side surface of the furnace lid in which the opening for the small lid is opened, and the outer peripheral portion of the furnace lid is sealed with a metal fitting such as a knife edge, and the above-mentioned lid for the small lid is used. The fixing plate is brought into contact with the sealing plate at the opening portion along the opening from the furnace body side, and the fixing plate is bolted to the furnace lid with the sealing plate interposed therebetween, thereby sealing the opening for the small lid. In coke oven door seal structure to ensure safety,
The fixing plate is composed of a plurality of divided pieces divided along the circumferential direction of the opening, and the ends of the adjacent divided pieces are arranged in the thickness direction with a gap in the dividing direction. Coke oven door seal structure characterized by overlapping. In the coke oven door seal structure comprising a small lid inner frame projecting to the furnace body side on a part of the fixed plate,
The small lid inner frame is provided with an opening and a fixing plate mounting bolt hole penetrating from the surface on the furnace lid side of the fixing plate toward the opening. Coke oven door seal structure.

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