JP2014210838A - Backstay structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backstay structure which suppresses swelling deformation due to thermal expansion by e.g. heat of flame.SOLUTION: A backstay structure is arranged along a flash plate 16 of a coke oven, and the backstay 18 is fixed to the flash plate 16 with a tie rod 22 through a tie rod fixation plate 20 which is arranged in a part of an outer-side flange outer surface 18a of the backstay 18. Bearing members 32 which transmit supporting pressures while allowing deformation in the extending direction of the backstay 18 due to thermal expansion are arranged each between the backstay 18 and the flash plate 16 and between the backstay 18 and the tie rod fixation plate 20.

Description

  The present invention relates to a backstay structure that supports a furnace wall of a furnace such as a coke oven.

  A conventional chamber-type coke oven has, as its main structure, 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. And the carbonization chamber and the combustion chamber are alternately arranged on the heat storage chamber, and the furnace body is formed as a whole. As shown in FIG. 12, furnace body hardware such as a head plate 3 and a flash plate 4 is installed on the front and rear surfaces of the furnace body in order to hold the furnace wall brick 2 above the heat storage chamber 1. 5 holds the furnace body 8 by tightening the backstay 5 with a cross tie rod 6 disposed at the top of the furnace and an anchor bolt 7 disposed at the bottom of the furnace. In addition, in FIG. 12, it has illustrated about the front side part of the furnace body, and since it is the same structure as the front side part about the rear side part, illustration is abbreviate | omitted.

  However, as the operation continues, the backstay is gradually deformed, resulting in a portion that cannot sufficiently hold the furnace body, resulting in breakage of the furnace wall bricks and damage to the gas seal. As a result, when carbonization gas generated by coal carbonization leaks from these gaps and ignites to generate a flame, the backstay 5 struck by the flame is deformed into a square shape as shown in FIG. Cause fatal damage such as overhanging. This generation mechanism is caused by local plasticization of the portion of the backstay 5 that has been struck by the flame, and the rigidity is reduced. In addition, although the expansion is caused by thermal expansion, it is hindered by upper and lower end restraints and axial compression. A force is generated and projects outward.

  In such a case, conventionally, the boom provided in the lifting machine is extended, the existing back stay is held with the binding jig attached to the tip of the boom, and the defective part is cut out by manual gas cutting etc. Was suspended by a lifting machine and removed, and instead, a new steel material for backstay was suspended by a lifting machine and incorporated into a cut portion and joined by welding or the like.

  On the other hand, in Patent Document 1, a slave carriage that is movable back and forth in the coke oven furnace length direction and attached with a backstay fixing means is placed on a master carriage that can move on the coke oven platform. Backstay exchange devices have been proposed. By using this backstay replacement device, the backstay replacement operation can be easily performed even in a situation where the lifting machine cannot be arranged.

JP 2001-11466 A

  By the way, even if it uses the backstay exchange apparatus of said patent document 1, after cutting out the defective part of a backstay by gas cutting etc. by human power and removing the cut-out part, a new steel material for backstays is built in a cutting location. It is necessary to join by welding. In this case, it requires a lot of work and costs, such as investigation of defective parts, design and production of new backstays for partial replacement, and construction work, and it is restricted to operation during the construction work period. Problems such as occur. However, in the first place, if the back stay does not protrude and deform even if it is struck by a flame, it is reasonable because there is no work and cost associated with the replacement of the back stay. For this reason, there has been a demand for a technique for suppressing the overstaying deformation of the backstay caused by thermal expansion due to the heat of the flame.

  The present invention has been made in view of the above, and an object of the present invention is to provide a backstay structure that suppresses overhang deformation caused by thermal expansion due to the heat of a flame or the like.

  In order to solve the above-described problems and achieve the object, a backstay structure according to the present invention is a backstay structure installed along a furnace wall of a coke oven, and the backstay has an outer surface. It is fixed to the furnace wall by a tie rod through a tie rod fixing plate installed in a part, and between the back stay and the furnace wall, and between the back stay and the tie rod fixing plate, A bearing member that transmits a support pressure while allowing deformation due to thermal expansion in the extending direction is provided.

  Another backstay structure according to the present invention is characterized in that, in the above-described invention, the bearing member is formed of a thin plate.

  Another backstay structure according to the present invention is characterized in that, in the above-described invention, the bearing member is constituted by two thin plate-shaped dry bearings stacked.

  Another backstay structure according to the present invention is the above-described invention, wherein in the above-described invention, hot lubricant is applied or filled between at least one of the furnace wall and the thin plate and between the tie rod fixing plate and the thin plate. It is characterized by that.

  Another backstay structure according to the present invention is characterized in that, in the above-described invention, the backstays installed adjacent to each other along the furnace wall are connected by a plurality of horizontal connecting members.

  According to the present invention, there is a back stay structure installed along the furnace wall of the coke oven, and the back stay is attached to the furnace wall by a tie rod via a tie rod fixing plate installed on a part of the outer surface thereof. The support pressure is transmitted between the back stay and the furnace wall and between the back stay and the tie rod fixing plate while allowing deformation due to thermal expansion in the extending direction of the back stay. Since the bearing member to be provided is provided, the extension of the backstay due to thermal expansion can be released in the extending direction. Thereby, there is an effect that it is possible to suppress the outward deformation of the backstay caused by the thermal expansion due to the heat of the flame or the like.

1A and 1B are diagrams showing an embodiment of a backstay structure according to the present invention, in which FIG. 1A is a partial sectional view of a side surface, and FIG. 1B is a front view. 2 is a cross-sectional view taken along the line AA of FIG. 1 (a thin plate is applied to the general part). 3 is a cross-sectional view taken along the line BB in FIG. 1 (a thin plate is applied to the cross tie rod fixing unit). 4 is a cross-sectional view taken along the line AA in FIG. 1 (a dry bearing is applied to a general part). 5 is a cross-sectional view taken along the line BB in FIG. 1 (a dry bearing is applied to the cross tie rod fixing unit). FIG. 6 is a cross-sectional view taken along the line AA in FIG. 1 (a hot lubricant is applied to the general part). FIG. 7 is a cross-sectional view taken along the line BB in FIG. 1 (a hot lubricant is applied to the cross tie rod fixing portion). FIG. 8 is a view for explaining a mechanism for minimizing the amount of deformation of the backstay according to the present invention. FIG. 9 is a diagram showing an analysis model. 10A and 10B are diagrams showing a deformation mode by analysis (deformation magnification 20 times). FIG. 10A shows a case where the upper end is pin-fixed, and FIG. 10B shows a case where the upper end is slidable. 11A and 11B are diagrams showing another embodiment of the backstay structure according to the present invention, in which FIG. 11A is a diagram in which horizontal connecting materials are arranged in a bracing manner, and FIG. 11B is an illustration in which horizontal connecting materials are arranged in a zigzag shape. FIG. FIG. 12 is a partial cross-sectional view of a side surface of a conventional chamber-type coke oven. FIG. 13 is a schematic view of a backstay's shape deformation that is struck by a flame.

  Embodiments of a backstay structure according to the present invention will be described below in detail with reference to the drawings. In the following description, an example of a backstay installed along the furnace wall of a chamber-type coke oven will be described. Moreover, this invention is not limited by this embodiment.

(Embodiment 1)
First, Embodiment 1 of the present invention will be described.
As shown in FIG. 1, a head plate 14 and a flash plate 16 are installed on a side surface of a furnace wall brick 12 at an upper part of a heat storage chamber 10 of a chamber-type coke oven. It is held by two columnar backstays 18. The backstay 18 is fastened and fixed to the ceiling brick 24 by a cross tie rod 22 (tie rod) via a cross tie rod fixing plate 20 (tie rod fixing plate) arranged at the upper part of the furnace, and by anchor bolts 26 arranged at the lower part of the furnace. It is fastened and fixed to the furnace body 28. Here, a notch 30 for passing the cross tie rod 22 is provided in the flange of the back stay 18 at the upper part of the furnace, and the cross tie rod fixing plate 20 is disposed on the outer flange outer surface 18 a of the back stay 18.

  The backstay structure 100 according to the first embodiment includes a backstay 18 and a cross tie rod fixing plate 20 in a cross tie rod fixing portion at the upper part of the furnace, between the back stay 18 and the flash plate 16 in a general portion where the back stay 18 extends. A bearing member 32 is provided between each of the two. The bearing member 32 transmits a support pressure while allowing deformation due to thermal expansion in the upward direction (extending direction) of the backstay 18. In the first embodiment, the bearing member 32 is configured by a thin plate. This specific configuration will be described with reference to FIGS.

  As shown in FIG. 2, in the general part where the back stay 18 extends, a thin plate 34 as a bearing member 32 is installed between the flash plate 16 and the furnace wall side flange outer surface 18 b of the back stay 18. When the backstay 18 is thermally expanded, the backstay 18 is in a state in which it can be extended and deformed upward (sliding) by thermal expansion while the supporting pressure is transmitted by the thin plate 34. Here, as the thin plate 34, for example, stainless steel having high corrosion resistance and high heat resistance can be used. The thickness of the thin plate 34 is preferably about 1 to 6 mm, and is preferably divided into lengths of about 30 to 50 cm from the viewpoint of thermal expansion, and arranged at appropriate intervals. As an installation range of the thin plate 34, FIG. 1 shows an example in which the entire backstay is installed. However, the present invention is not limited to this. In general, the occurrence of a flame often occurs in the upper part of the furnace. You may install in only a part.

  As shown in FIG. 3, in the cross tie rod fixing portion, between the side surface 24 a of the ceiling brick 24 and the furnace wall side flange outer surface 18 b of the back stay 18 and between the outer flange outer surface 18 a of the back stay 18 and the cross tie rod fixing plate. A thin plate 34 is installed as a bearing member 32. For this reason, when the back stay 18 is thermally expanded, the back stay 18 is in a state in which it can be extended and deformed upward (sliding deformation) due to thermal expansion while the supporting pressure is transmitted by the respective thin plates 34. Yes. Here, the notch 30 of the cross tie rod fixing part shown in FIGS. 1 and 3 is provided in each flange 18a, 18b of the backstay 18, but the length of the notch 30 in the vertical direction is It is desirable to set the length to allow for a margin (for example, about 50 mm) so as not to inhibit upward deformation due to thermal expansion of the backstay 18. Further, when other equipment such as a dry main is installed on the upper portion of the back stay 18, it is preferable that the back stay 18 can follow an extension deformation of a predetermined length (for example, about 50 mm). The anchor bolt 26 at the lower part of the furnace is preferably fixed as in the conventional structure.

  The backstay 18 is preferably made of steel for the purpose of ensuring sufficient strength and rigidity to hold the furnace body. The material of the steel material to be used may be a general material such as SS material, SM material, SN material. These materials can be used as they are or by processing a shape steel such as H-shaped steel, groove-shaped steel, or angle steel, a welding material such as a flat bar or built-in H, a casting, or the like.

  As described above, according to the present embodiment, it is possible to suppress the overstaying deformation of the backstay caused by the thermal expansion due to the heat of the flame and the like, and thus it is not necessary to replace the defective portion of the backstay. Therefore, it is possible to reduce the labor and cost required for the adjustment of defective parts, new backstay design, production, and construction, which were necessary when replacing the backstay, and eliminate the opportunity loss due to the operation stop during that time. Can do.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described.
The backstay structure 200 according to the second embodiment is configured such that the bearing member 32 of the first embodiment is formed by stacking two thin plate-like dry bearings instead of the thin plate 34.

  In this case, as shown in FIG. 4, in the general portion, two thin plate-like dry bearings 36 are placed between the flush plate 16 and the furnace wall side flange outer surface 18 b of the backstay 18. As shown in FIG. 5, in the cross tie rod fixing portion, between the side surface 24 a of the ceiling brick 24 and the furnace wall side flange outer surface 18 b of the back stay 18 and between the outer flange outer surface 18 a of the back stay 18 and the cross tie rod. Two thin plate-like dry bearings 36 are stacked between the fixing plate 20. By enabling sliding between the two installed dry bearings 36, the sliding performance of the sliding surface when the backstay 18 undergoes expansion deformation (sliding deformation) due to thermal expansion is significantly improved. For this reason, the overhang deformation of the backstay 18 caused by thermal expansion due to the heat of the flame or the like can be further suppressed.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.
The backstay structure 300 according to the third exemplary embodiment is the same as that of the first exemplary embodiment described above, at least between the flash plate 16 and the thin plate 34 as a general part and between the cross tie rod fixing plate 20 and the thin plate 34 as a cross tie rod fixing unit. One is coated or filled with a hot lubricant.

  In this case, for example, as shown in FIG. 6, in the general part, a hot lubricant 38 is applied or filled between the flash plate 16 and the thin plate 34. Further, as shown in FIG. 7, in the cross tie rod fixing portion, hot lubricant 38 is applied between the side surface 24 a of the ceiling brick 24 and the thin plate 34, and between the cross tie rod fixing plate 20 and the thin plate 34. Or fill and install. By doing so, it is possible to further improve the sliding performance of the slide surface when the backstay 18 is subjected to expansion deformation (slide deformation) due to thermal expansion. For this reason, the overhang deformation of the backstay 18 caused by thermal expansion due to the heat of the flame or the like can be further suppressed. Here, as the hot lubricant 38, a high-temperature benton grease that can be used even at a high temperature up to about 800 ° C., blended with a soft metal that exhibits lubricity at a high temperature, molybdenum disulfide having a high heat resistance, and the like. Can be used.

Next, a mechanism for minimizing the amount of deformation of the backstay according to the present invention will be described with reference to FIG.
In the present invention, when the portion of the backstay 18 that is beaten by the flame is about to expand due to thermal expansion, between the backstay 18 and the flash plate 16, between the backstay 18 and the side surface 24 a of the ceiling brick 24, The backstay 18 is smoothly slidable upward by the bearing members 32 provided between the backstay 18 and the cross tie rod fixing plate 20, respectively. Accordingly, the extension of the backstay 18 due to thermal expansion can be released upward. As a result, the amount of deformation of the back stay 18 protruding outward can be minimized.

  Here, a thin plate 34 is adopted as the bearing member 32, and hot between the thin plate 34 and the flash plate 16, between the thin plate 34 and the ceiling brick side surface 24 a, and between the thin plate 34 and the cross tie rod fixing plate 20. When each of the lubricants 38 (see FIGS. 6 and 7) is applied or filled, the frictional force of the sliding surface between them becomes small, so that the sliding deformation in the upward direction of the backstay 18 becomes even smoother. Become.

  Next, the analysis performed in order to confirm the effect by this invention and the suitable conditions where an effect is exhibited is demonstrated. This analysis model is shown in FIG. In this analysis, a simple model in which one backstay was modeled as a shell element and part of a brick (furnace wall) as a solid element was used, and the head plate and flash plate were omitted. In addition, an interface element that transmits only the supporting pressure at the time of contact is used at the boundary between the backstay and the brick.

The back stay was H400 × 150 × 14 × 28 and an SS400 H-section steel with a height of 9300 mm, and the stress-strain relationship of the steel material was the one proposed in Reference 1 below. For the brick, the assumed value of Young's modulus: 2011 N / mm ² and Poisson's ratio 0.23 was used.

[Reference 1] Architectural Institute of Japan, Steel Structure Fireproof Design Guidelines, pp. 15-17, 1999

  FIG. 10 shows an analysis result comparing the deformation modes (deformation magnification of 20 times). Here, FIG. 10A is a simulation of a conventional structure, in which the upper end is fixed to a pin and the upper end of the backstay is restrained so as not to slide upward. FIG. 10B is a simulation of the present invention, in which the upper end is slidable (open end) and the backstay can be slid upward. In this analysis, it was assumed that a flame having a vertical width of 400 mm was generated at 700 ° C. at a position of 2500 mm from the upper end.

  In the case of FIG. 10A simulating the conventional structure, the back stay protrudes outside by 67.3 mm due to thermal expansion and lowering of rigidity at high temperature, whereas FIG. 10B simulating the present invention. In this case, it can be seen that the amount of outward deformation can be reduced by sliding the backstay upward by 15.6 mm.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described.
As shown in FIG. 11, the backstay structures 400 and 401 according to the fourth embodiment include a plurality of backstays 18 that are installed adjacent to each other along the flash plate 16 of the furnace wall in the first to third embodiments. It is connected and restrained by a horizontal connecting material 40. Here, FIG. 11A shows a backstay structure 400 in which a plurality of horizontal connecting members 40 are arranged in a bracing manner, and FIG. 11B shows a backstay structure 401 in which the horizontal connecting members 40 are arranged in a zigzag shape. Show.

  As the horizontal connecting member 40, steel materials such as groove steel, angle steel, H-shape steel, and flat bar can be used, and the steel plate is joined to the backstay 18 by welding or bolt joining. The horizontal connecting member 40 may be installed on the entire backstay, but since the occurrence of a flame often occurs in the upper part, it may be installed only in a part such as the upper part of the backstay 18. Thereby, even when the backstay 18 is struck by a flame and local plasticization occurs, the horizontal tie material 40 can compensate for a decrease in rigidity of the plasticized portion in the peripheral elastic region. Therefore, the overhang deformation of the backstay 18 caused by thermal expansion due to the heat of the flame or the like can be further suppressed.

  As described above, according to the present invention, the backstay structure is installed along the furnace wall of the coke oven, and the backstay is interposed via a tie rod fixing plate installed on a part of the outer surface thereof. Fixed to the furnace wall by tie rods, and allowed to deform due to thermal expansion in the extending direction of the back stay between the back stay and the furnace wall and between the back stay and the tie rod fixing plate. However, since the bearing member that transmits the supporting pressure is provided, the backstay can be released from the thermal expansion in the extending direction. Thereby, the overhanging deformation | transformation to the outer side of the backstay resulting from the thermal expansion by the heat | fever of a flame, etc. can be suppressed.

  As described above, the backstay structure according to the present invention is useful for a backstay that supports a furnace wall such as a coke oven, and particularly, the backstay overhang deformation caused by thermal expansion due to the heat of a flame or the like. Suitable for suppressing.

10, 1 Heat storage chamber 12 Furnace wall brick 14 Head plate 16 Flash plate 18 Back stay 18a Outer flange outer surface of back stay 18b Furnace wall side flange outer surface of back stay 20 Cross tie rod fixing plate (tie rod fixing plate)
22 Cross tie rod (tie rod)
24 ceiling brick 24a side of ceiling brick 26 anchor bolt 28, 8 furnace body 30 notch 32 bearing member 34 thin plate (bearing member)
36 Dry bearing 38 Hot lubricant 40 Horizontal connecting material 100, 200, 300, 400, 401 Backstay structure

Claims (5)

A backstay structure installed along the furnace wall of the coke oven,
The back stay is fixed to the furnace wall by a tie rod through a tie rod fixing plate installed on a part of the outer surface thereof,
A bearing member that transmits a support pressure between the back stay and the furnace wall and between the back stay and the tie rod fixing plate while allowing deformation due to thermal expansion in the extending direction of the back stay. Backstay structure characterized by providing   The backstay structure according to claim 1, wherein the bearing member is formed of a thin plate.   The backstay structure according to claim 1, wherein the bearing member is configured by stacking two thin plate-shaped dry bearings.   The backstay structure according to claim 2, wherein a hot lubricant is applied or filled between at least one of the furnace wall and the thin plate and between the tie rod fixing plate and the thin plate.   The backstay structure according to any one of claims 1 to 4, wherein the backstays installed adjacent to each other along the furnace wall are connected by a plurality of horizontal connecting materials.

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