JP2015137291A - Furnace casing hardware of coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide furnace casing hardware of a coke oven which can prevent distortion and falling of the furnace casing hardware itself and distortion of a buck stay precisely under influence of coke extrusion load and thermal load.SOLUTION: As furnace casing hardware of a coke oven, a head plate 34, a protection ledge 37 and a protection plate 38, which are used conventionally, are unified to be a solid construction furnace casing hardware 50.

Description

  The present invention relates to a furnace body hardware that supports furnace bricks of a coke oven.

  In general, a chamber-type coke oven is used as the coke oven (see, for example, Patent Document 1).

  The chamber furnace type coke oven is classified into a curl steel type, an Otto type, and the like. Here, as a representative example, a curl steel type coke oven will be described.

  FIG. 4 shows a partial cross-sectional plan view of the furnace front side of a chamber furnace type coke oven (hereinafter also simply referred to as “coke oven”).

  As shown in FIG. 4, the chamber-type coke oven 1 is configured by arranging a number of combustion chambers 31 and carbonization chambers 32 alternately in the furnace width direction. And the furnace brick 40 of the combustion chamber 31 and the carbonization chamber 32 is covered and supported by various hardware.

  These hardwares are referred to as furnace body hardware 11, door frame 35 that forms kiln opening 10 of carbonizing chamber 32, protection ledge 37 that holds bricks in combustion chamber 31, protection plate 38, head plate 34, and flash plate 33. , A hook bolt 36, an upper wall plate (not shown) for holding the brick 40 on the upper side of the combustion chamber 31 and the carbonization chamber 32, a lower wall plate (not shown) for holding the lower brick 40, and the like.

  Of the above-mentioned furnace body hardware 11, hardware (door frame 35, protection ledge 37, protection plate 38, head plate 34, flash plate 33, hook bolt 36, etc.) disposed in the vicinity of the furnace opening 10 is a kiln. It is called a base 12.

  During normal operation, the furnace body 11 is supported by the backstay 2 and is fastened by a tension rod (not shown) disposed at the top or bottom of the furnace to hold the furnace body 3.

  Here, the enlarged view of the vicinity of the kiln 10 in FIG. 4 is shown in FIG. As shown in FIG. 3, conventionally, a protection ledge 37, a protection plate 38, a head plate 34, and the like are installed in the vicinity of the kiln 10 as a kiln 11 (kiln fitting 12).

  However, in the chamber furnace type coke oven 1, the height of the carbonization chamber 32 and the combustion chamber 31 is about 8 to 10 m, and the brick 40 in this portion has a high temperature exceeding 1000 ° C. necessary for carbonization (dry distillation) of coal. Since the temperature of the furnace body metal 11 becomes high, the furnace body 11 itself is heated by the above heat load in addition to the coke extrusion load during long-term operation. Deformation, deformation of the backstay 2, breakage of the connection bolt, etc. occur, the furnace body hardware 11 (particularly the kiln mouth metal 12) is dropped, the deformation of the furnace body 3 proceeds, and finally the furnace body brick 40 is There may be a problem that it collapses.

  And the lifespan of the existing coke oven 1 exceeds 40 years, and the deformation of the furnace body 3, the wear of the furnace body bricks 40, and the deterioration of the furnace body hardware 11 are increasing.

  However, since the construction of the coke oven 1 requires enormous costs, it is directed to achieve cost reduction by extending the life of the coke oven 1.

  For this reason, the soundness of the furnace body 3 has been maintained by repairing and replacing the deformed or dropped furnace body 11 and replacing the deformed backstay 2.

Japanese Examined Patent Publication No. Sho 62-0197799

  As described above, in the coke oven 1, since the temperature of the furnace body 11 is also high, the furnace body 11 itself is deformed, the backstay 2 is deformed, the connection bolt is broken, etc. during a long-term operation. May occur, and the furnace body hardware 11 (particularly the kiln mouth metal 12) may drop off, the deformation of the furnace body 3 proceeds, and the furnace body brick 40 may eventually collapse.

  On the other hand, repair and replacement of the deformed and dropped furnace body 11 and replacement of the deformed backstay 2 have been performed, and until now, the soundness of the furnace body 3 is maintained. I did it.

  However, it takes considerable time and cost to repair / replace the furnace body 11 that has been deformed or dropped and to replace the deformed backstay 2 as described above.

  The present invention has been made in view of the circumstances as described above, and as a furnace body hardware of a coke oven, even under the influence of a coke extrusion load or a heat load, the furnace body hardware itself is deformed or dropped, and the backstay An object of the present invention is to provide a furnace body hardware capable of accurately preventing deformation.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors pay attention to the protection ledge 37 and the protection plate 38 which are particularly problematic in the furnace hardware 11, and the protection ledge 37 and the protection plate 38. It has been found that it is very effective to integrate the protection ledge 37 and the protection plate 38 with the head plate 34 (integral structure) in order to prevent the deformation and dropout of the head.

  The present invention is based on the above findings and has the following features.

  [1] A furnace body hardware for fastening a brick of a coke oven, which is an integrally structured furnace body structure in which a head plate, a protection ledge, and a protection plate are integrally structured.

  [2] The furnace body metal of the coke oven according to [1], wherein the meat is cut out.

  [3] A coke oven in which the furnace body hardware according to [1] or [2] is installed.

  In the present invention, it is possible to accurately prevent the deformation and dropping of the furnace body and the deformation of the backstay even under the influence of the coke extrusion load and the heat load. As a result, it is possible to maintain the soundness of the furnace body and extend the life of the coke oven while minimizing the number of repairs and replacements of the furnace body hardware and backstay.

It is a figure which shows the furnace metal fitting which concerns on Embodiment 1 of this invention. It is a figure which shows the furnace metal fitting which concerns on Embodiment 2 of this invention. It is a figure which shows the conventional furnace metal fitting. It is the schematic of a chamber furnace type coke oven.

  Embodiments of the present invention will be described with reference to the drawings. Here, as described above, the description will be made on the curl steel type chamber coke oven.

[Embodiment 1]
FIG. 1 is a view showing a furnace body according to Embodiment 1 of the present invention, and corresponds to FIG. 3 showing a conventional furnace body.

  As shown in FIG. 1, in the first embodiment, the head plate 34, the protection ledge 37, and the protection plate 38 shown in FIG.

  By adopting such a monolithic furnace body 50, compared to the case where it is divided into individual furnace bodies (head plate 34, protection ledge 37, protection plate 38) as in the prior art (separate structure furnace body). In addition, durability against coke extrusion load and heat load is improved, and connection bolts connecting the individual furnace body hardware are also unnecessary.

  As a result, in the first embodiment, deformation and dropping of the monolithic furnace body 50 itself, and further, deformation of the backstay 2 can be accurately suppressed.

  Here, in order to investigate the thermal load acting on the monolithic furnace body 50, thermal stress analysis was performed on each of the monolithic furnace body 50 and the separated structure furnace body by the finite element method. The material used was FC400, which is generally used for furnace body hardware.

  As a result, the thermal stress of the integrally structured furnace body 50 was not significantly different from the thermal stress of the separated structure furnace body. In particular, in the monolithic furnace body 50, stress concentration (thermal stress concentration) due to heat is generated in the bent portion 50a shown in FIG. 1, but the bent portion 50a where the thermal stress concentration occurs and the thermal stress condition becomes strictest. But it was a sufficiently acceptable thermal stress level.

  It should be noted that the strength of FC400 decreases with increasing temperature when the temperature exceeds a certain temperature (for example, 300 ° C), but refractory steel hardly deteriorates in strength compared to room temperature even in a high temperature region (for example, 300 ° C to 600 ° C). If refractory steel is used for the monolithic furnace body hardware 50, it is possible to cope with the high temperature operation of the coke oven and to improve the operation rate.

[Embodiment 2]
FIG. 2 is a diagram illustrating a furnace body according to the second embodiment of the present invention, and corresponds to FIG. 1 illustrating the furnace body according to the first embodiment of the present invention.

  As shown in FIG. 2, the basic structure of the furnace body 50 according to the second embodiment is the same as that of the furnace body 50 according to the first embodiment. A punched portion 51 (the remaining thickness is 30 mm or more at the thinnest portion) is provided.

  As a result, in the second embodiment, the deformation and dropping of the monolithic furnace body 50 itself and the deformation of the backstay 2 can be accurately suppressed, and the weight can be reduced, and the renewal work can be performed. Construction load can be reduced.

  In this case as well, the thermal stress was analyzed by the finite element method in the same manner as described above. However, there was no particular difference between the thermal stress of the separated structural furnace body and the integrally structured furnace body of the first embodiment, and it was sufficiently used It was a level to endure.

DESCRIPTION OF SYMBOLS 1 Chamber furnace coke oven 2 Backstay 3 Furnace body 10 Kiln opening 11 Furnace body hardware 12 Kiln mouth hardware 31 Combustion chamber 32 Carbonization chamber 33 Flash plate 34 Head plate 35 Door frame 36 Hook bolt 37 Protection ledge 38 Protection plate 40 Brick 50 Monolithic furnace body 50a Bent part 51 Meat removal part

Claims (3)

  A furnace body for fastening a brick of a coke oven, wherein the furnace body is a monolithic furnace body having a head plate, a protection ledge, and a protection plate integrally formed.   The furnace body metal of the coke oven according to claim 1, wherein the meat is cut out.   A coke oven in which the furnace body hardware according to claim 1 or 2 is installed.

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