JP2013104048A - Oven shutting structure of chamber-type coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oven shutting structure of a coke oven, which does not allow the total weight of a protection plate, a door frame and a door to always concentrate and act on under-protection plate bricks of a corbel end part.SOLUTION: The chamber-type coke oven 1 is configured such that doors 8 arranged on both ends in the oven longitudinal direction of each of a plurality of carbonization chambers 3 which are alternately arranged with combustion chambers 4 in an oven battery direction are held by door frames 9 attached on protection plates 7 arranged on both ends in the oven longitudinal direction of the combustion chambers 4, and an oven shutting force is imparted in the oven longitudinal direction of the combustion chambers 4 through the protection plates 7 by backstays 6 arranged on both ends in the oven longitudinal direction of the combustion chambers 4. The protection plate 7 is configured to be vertically supported through a spring 14 installed on the backstay 6. The expansion of the bricks are made free during cold and during being heated, and after being heated, a supporting load at the end of the corbel part is reduced to thereby achieve the elongation of the brick life. After being heated, a sealing function can be held by pressing a sealing material, and the gas leakage from the carbonization chamber to outside the oven during coal carbonization can be prevented.

Description

  The present invention relates to a furnace tightening structure at both ends of a carbonizing chamber in the extrusion direction (hereinafter referred to as “furnace length direction”) in a chamber furnace type coke oven (hereinafter simply referred to as “coke oven”).

  A cross section in the furnace length direction of the coke oven 1 is shown in FIG. As shown in FIG. 6, the coke oven 1 is located on the upper right (upper stage) of the heat storage chamber 2 provided on the lower side (lower stage) via a corbel part (also referred to as “bellows part”) 5 on the right side of the drawing. The carbonization chamber 3 shown in the half and the combustion chamber 4 shown in the left half of the drawing are alternately arranged in the furnace group direction perpendicular to the furnace length direction (the front-rear direction of the drawing in FIG. 6). The heat storage chamber 2, the carbonization chamber 3, the combustion chamber 4, and the corbel 5 are brick structures constructed by brickwork.

  At both ends of the carbonization chamber 3 in the furnace length direction, backstays 6 for applying a furnace clamping force to the brick structure are disposed. The furnace tightening force of the backstay 6 is obtained by the heat storage chamber 2, via a protective plate 7 (see FIG. 7) disposed between the carbonization chamber 3 and the backstay 6 in the upper and lower brick building portions of the combustion chamber 4. It is transmitted to the carbonization chamber 3, the combustion chamber 4, and the corbel unit 5.

  As shown in FIG. 7, a heavy door 8 is disposed at the furnace length direction end of the carbonization chamber 3, and this door 8 is disposed on the protective plate lower brick 5 a constituting the corbel portion 5. It is held by a door frame 9 attached to the protection plate 7.

  Therefore, the total weight of the protective plate 7, the door frame 9, and the door 8 is supported by the protective plate lower brick 5 a of the corbel portion 5 at the end of the coke oven 1 in the furnace length direction. That is, the protective plate lower brick 5a of the corbel part 5 receives the impact load at the time of attaching / detaching the door 8 attached / detached every day.

  Since the protective plate lower brick 5a at the end of the corbel 5 supports the total weight of the protective plate 7, the door frame 9, and the door 8 as described above and receives an impact when the door 8 is attached / detached, the frequency of damage occurrence Becomes higher.

  When the brickwork at the end of the coke oven 1 in the furnace length direction is damaged, the adjacent heat storage chambers 2 are short-circuited, the adjacent corbel ducts 10 are short-circuited, and the corbel duct 10 and the outside of the furnace are short-circuited. As a result, the fuel gas is wasted by being mixed with air in the heat storage chamber 2 and combusted, or mixed with the combustion exhaust gas and discarded without being combusted. Furthermore, the brick becomes too hot due to abnormal combustion, which causes damage to the brick. Moreover, if the protection plate lower brick 5a is damaged, furnace-clamping hardware such as the protection plate 7 and the door frame 9 slides downward, which is not preferable.

  The brick structure that constructs the heat storage chamber 2, the carbonization chamber 3, the combustion chamber 4, and the corbel unit 5 is at room temperature when it is assembled by construction work. Then, it is dried and heated over a period of several months, and thereafter operation as a coke oven (coal charging into the carbonization chamber 3, repeated discharge of coke, which is a product carbonized by heat from the combustion chamber 4) ), But the operation will last for decades.

  Hereinafter, in the present invention, the respective times are referred to as cold (before heating), during heating, after heating (after operation), and the like.

  Therefore, in Patent Document 1, when cold, when the projection formed on the protection plate comes into contact with the projection formed on the backstay and supports the protection plate in the vertical direction, the weight of the lower brick of the protection plate is increased. I try not to work. During and after heating, the protective plate is supported by the thermally expanded protective plate lower brick and the protective plate is raised, and then the padding is interposed between the backstay protrusions and the protective plate protrusions to protect By receiving the weight of the plate with the backstay, the weight is not applied to the lower brick of the protective plate.

  In the structure proposed in Patent Document 1, it is preferable that the gap between the lower brick of the protective plate and the lower end of the protective plate after heating is within 10 mm.

  However, it is well known that during the operation of a coke oven, the brick structure undergoes some change in expansion according to the dry distillation of coal.

  As a result of this expansion change, the furnace tightening force changes and the backstay deflection changes. As a result, movement in the furnace length direction is also accompanied, and leakage of gas generated during coal dry distillation to the outside of the furnace is prevented. Therefore, the defect of not being able to maintain the function of the sealing material provided between the protective plate and the brick structure is the same as the structure of Patent Document 1. In addition, in the case of the structure of Patent Document 1, there is a concern that the filling may move or drop due to the minute change during operation.

  Patent Document 2 proposes a structure in which the brick thickness at the end in the furnace length direction that supports the total weight of the coke oven protection plate, door frame, and door is increased in the furnace length direction. With the structure proposed in Patent Document 2, damage to the brick structure at the end portion in the furnace length direction of the coke oven can be reduced.

  However, even in the structure proposed in Patent Document 2, the total weight of the protective plate, the door frame, and the door is always concentrated on the protective plate lower brick at the end of the corbel portion.

  Therefore, since the damage to the brick structure due to the operation over time cannot be prevented, the effect must be questioned. Moreover, since the ceiling level of the heat storage chamber is not the same at the center and the end in the furnace length direction of the coke oven, the construction cost of the coke oven increases. Furthermore, there is a problem that the construction period for constructing the coke oven becomes longer due to the extension of the construction period.

JP 2008-127529 A JP-A-8-311455

  The problem to be solved by the present invention is that the structure of Patent Document 1 has the same disadvantage as that due to the change in the expansion amount of the brick structure during operation. In the structure of Patent Document 1, the padding is in operation. There is a concern that even the worries of moving or dropping due to the minute change of the above. Moreover, in the structure of patent document 2, it is a point that the total weight of a protection board, a door frame, and a door always concentrates and acts on the protection board lower brick of a corbel part edge part.

  The total weight of the protective plate, door frame, and door provided at the end of the coke oven in the furnace length direction is supported only by the brick below the protective plate at the end of the coke oven in the furnace length direction. If the weight of the protection plate or the like can be supported not only by the protection plate lower brick but also by the backstay, the load acting on the protection plate lower brick is reduced. As a result, even if the thickness of the protective plate lower brick at the end portion in the furnace length direction is set to the same thickness as the central portion in the furnace length direction, the protection plate lower brick can be prevented from being damaged.

  However, the brick structure that constitutes the coke oven is at room temperature at the time of construction, but when the temperature rises as a result of starting heating, it naturally expands and the height of the heat storage chamber rises. The height position also rises. Therefore, conventionally, the protective plate is placed on the lower brick of the protective plate without being supported by the backstay, and the total weight of the protective plate, the door frame, and the door is supported.

  On the other hand, once heated and thermally expanded, it is known that the height of the brick structure is kept constant, and the height change thereafter is very small. Therefore, if the protection plate is supported by the backstay after the first heating and thermal expansion has occurred, the brick structure will not support the weight of the protection plate during heating, so that the brick structure will not be damaged. Can be prevented.

  The present invention is based on the above concept for the purpose of providing a coke oven furnace closing structure in which the total weight of the protective plate, door frame, and door does not always concentrate on the protective plate lower brick at the end of the corbel. It was made based on.

The coke oven closing structure of the present invention is:
The doors arranged at both ends in the furnace length direction of the carbonization chambers arranged alternately with the combustion chambers in the furnace group direction are held by door frames attached to protective plates arranged at both ends of the combustion chamber in the furnace length direction, In the coke oven configured to apply a furnace clamping force in the furnace length direction of the combustion chamber via the protective plate with back stays arranged at both ends of the furnace length direction,
The most important feature is that the protection plate is supported in the vertical direction via a spring installed on the backstay.

  In the case of the coke oven furnace tightening structure of the present invention, the following drawbacks of Patent Document 1 can be solved by supporting the protective plate in the vertical direction via a spring installed on the backstay.

1) As a result of changes in the backstay flexure due to changes in the furnace tightening force accompanying changes in the expansion of the brick structure according to the dry distillation of coal during operation, it also involves movement in the furnace length direction.
2) The function of the sealing material provided between the protective plate and the brick structure to prevent leakage of gas generated during coal carbonization outside the furnace cannot be maintained.

  In the case of the coke oven furnace tightening structure of the present invention, the total weight of the protective plate, door frame, and door is supported by both the backstay and the lower brick of the protective plate, so that the weight is supported only by the lower brick of the protective plate. As described in Patent Document 2, it is possible to reduce brick damage due to aged operation without increasing the size of the protective plate lower brick on which the weight acts in the furnace length direction.

  In the coke oven furnace tightening structure of the present invention, the distribution of the weight supported by the backstay and the protective plate lower brick can be adjusted by the elastic force of the spring used.

  In the present invention, during cold and during heating, most of the total weight of the protective plate, door frame, and door is supported by the backstay so that the bricks expand freely, and after heating, a part of the total weight is protected. By supporting with the bricks at the bottom of the plate, the support load at the end of the corbel part is reduced, and the life of the brick can be extended.

  In addition, after heating, a part of the total weight of the protective plate, door frame, and door is always loaded on the lower brick of the protective plate, so the sealing function can be held down and the sealing function can be maintained. Gas leakage to the outside of the furnace can be prevented.

It is a furnace length direction sectional view of a coke oven, and is a figure explaining a furnace closing structure of a furnace length direction end. It is the A section enlarged view of Drawing 1, and is a figure explaining the side composition of a protection board support structure. It is the figure which looked at FIG. 2 from the BB direction, Comprising: It is a figure explaining the support beam structure attached to the protection board. It is a figure explaining the structure seen from the side surface direction of a protection board support structure, (a) is a figure of the state which maintains the free expansion | swelling of the brick during heating, (b) ensures the sealing performance after completion of heating. It is a figure of a state. It is a figure explaining the structure seen from the side surface direction of the protection board support structure, Comprising: It is a figure explaining the structure which provided the support beam of the protection board in the backstay side. FIG. 3 is a cross-sectional view of the coke oven in the furnace length direction, in which the left half of the drawing is a cross section of the combustion chamber and the right half of the drawing is a cross section of the carbonization chamber. It is a fragmentary top sectional view of the end of a coke oven in the furnace length direction, and is a view for explaining the arrangement of a protection plate, a door frame, a door, a brick structure, and a backstay.

  The purpose of the present invention is to prevent the total weight of the protective plate, door frame, and door from always acting on the lower brick of the protective plate at the end of the corbel, via a spring installed on the backstay. This was realized by supporting the protective plate in the vertical direction.

Hereinafter, a furnace-clamping structure of a coke oven according to the present invention will be described with reference to FIGS.
The inventor first configured the back plate 6 so that the total weight of the protective plate 7, the door frame 9, and the door 8 can be supported, and the back stay 6 supported all or most of the weight during heating. . On the other hand, after the heating is completed, the protective plate lower brick 5a and the backstay are kept before operation to maintain the sealing function for the purpose of preventing leakage of gas during dry distillation from between the protective plate 7 and the lower brick 5a. 6 was adjusted to be supported by both.

  As shown in FIG. 6, in the brick structure of the coke oven 1, the heat storage chamber 2 is disposed in the lower stage, the carbonization chamber 3 and the combustion chamber 4 are disposed in the upper stage, and the corbel portion 5 is disposed between the upper stage and the lower stage.

  The brick structure is attracted to both back stays 6 by tightening the cross tie rod furnace clamping springs 17 provided at both ends of the cross tie rod 16 penetrating the back stay 6 disposed at both ends of the carbonization chamber 3 in the furnace length direction. As a result, a furnace clamping force is applied to the brick structure disposed between the two backstays 6. In FIG. 1, reference numeral 20 denotes a furnace clamp disposed between the backstay 6 and the door frame 9.

  A protection plate 7 is disposed between the backstay 6 and the brick structure, which is the position of the carbonization chamber 3 and the combustion chamber 4 (upper stage of the brick structure) disposed in the upper part of the heat storage chamber 2. The furnace clamping force of the backstay 6 is transmitted to the brick structure.

  Doors 8 for sealing the carbonization chamber 3 during coke dry distillation are disposed at both ends of the carbonization chamber 3 in the furnace length direction (see FIG. 6). The door 8 is held by a door frame 9, and the door frame 9 is attached to the protective plate 7.

  The brick structure at the end of the carbonization chamber 3 in the furnace length direction is such that the upper carbonization chamber 3 and the combustion chamber 4 are slightly retracted toward the center in the furnace length direction with respect to the lower heat storage chamber 2 and the corbel portion 5, and the lower brick of the protective plate 5a has a structure protruding slightly toward the end in the furnace length direction, and the protection plate 7 is loaded above the slightly protruding portion (see FIG. 1).

  In general, the total weight of the protective plate 7, the door frame 9, and the door 8 is supported by the protective plate lower brick 5 a at the end of the corbel portion 5 when cold after construction. Moreover, it is the same during heating, and is configured to be lifted together with the expansion of the brick.

  The problem in this case is that the protection plate 7, the door frame 9, and the door 8 are still loaded on the protection plate lower brick 5a at the end of the corbel portion 5, so that the protection plate lower brick 5a is free to be heated. Inhibiting swelling.

  Furthermore, since the total weight of the protective plate 7, the door frame 9, and the door 8 is always applied to the end of the corbel part 5 even after the heating is completed (after the start of operation), the latest coke oven life is 50 years. Or the phenomenon that the said protection plate lower brick 5a is damaged by the operation progress of 60 years, etc. appears. In the worst case, there is a risk that the furnace tightening components such as the protective plate 7 will slide down, and normal operation cannot be performed.

  Therefore, in the present invention, the positional relationship between the protective plate 7 and the lower brick 5a of the protective plate is accurately maintained while compensating for such drawbacks during cold and during heating, and protection is provided by distribution within a certain setting range even after completion of heating. The configuration shown in FIG. 2 is adopted so that the total weight of the plate 7, the door frame 9, and the door 8 can be dispersed.

  In other words, in the present invention, the support beam 11 is attached to the back stay 6 from the protective plate 7 in a protruding shape with, for example, the bolt 18. On the other hand, the backstay 6 is provided with a protection plate receiving beam 12 provided with a protruding bar 13 penetrating the support beam 11, and the outer periphery of the bar 13 between the protection plate receiving beam 12 and the support beam 11. The total weight of the protection plate 7, the door frame 9, and the door 8 is transmitted to the backstay 6 through a spring 14 fitted to the portion.

  In the example of FIG. 2, a screw 13 a is formed on the rod 13, and a spring load adjusting nut 15 of the spring 14 is attached to the screw 13 a, thereby adjusting the adjusting nut 15 and changing the length of the spring 8. Thus, the weight supported on the backstay 6 side can be changed. That is, the distribution of the weight supported by the protective plate lower brick 5a and the weight supported by the backstay 6 can be adjusted.

  In the present invention having the above-described configuration, in order not to hinder the movement of the backstay 6 in the furnace length direction, as shown in FIG. 3, the bar 13 and the bar 13 provided in the support beam 11 of the protective plate 7 are penetrated. This can be handled by setting the gap d1 in the furnace length direction of the hole 11a to be equal to or greater than the movement amount of the backstay 6.

  Further, in order not to inhibit the movement of the backstay 6 in the furnace group direction, the movement amount of the backstay 6 is set in the gap d2 in the furnace group direction of the through hole 11a provided in the support beam 11 of the rod 13 and the protective plate 7. It can respond by setting it as the above.

  In the case of the furnace tightening structure of the present invention having the above-described configuration, during heating, as shown in FIG. The adjustment nut 15 is moved upward so as to be pressed so as to be slightly crushed, and the spring 14 is contracted.

  By doing so, the reaction force of the spring 14 is increased, and the weight supported by the protection plate lower brick 5a out of the total weight of the protection plate 7, the door frame 9, and the door 8 can be reduced. The free expansion can be maintained.

  Further, after the heating is completed, as shown in FIG. 4B, the adjustment nut 15 is moved downward to extend the spring 14, and the reaction force of the spring 14 is reduced. By doing in this way, the weight supported by the protection-plate lower brick 5a among the total weight of the protection plate 7, the door frame 9, and the door 8 is increased, and the sealing material 19 is crushed to ensure the sealing performance.

  FIG. 5 shows a structure in which the support beam 11 of the protection plate 7 is attached to the backstay side instead of the configuration shown in FIGS.

  In the configuration shown in FIG. 5, instead of attaching the support beam 11 of the protection plate 7 in a protruding manner from the protection plate 7, the rod 13 can be moved along the longitudinal direction of the rod 13. It is fitted. In the configuration of FIG. 5 as well, the total weight of the protection plate 7, the door frame 9, and the door 8 supported at the tip of the support beam 11 is transmitted to the backstay 6 via the spring 14.

  In such a configuration of FIG. 5, the positional relationship between the protective plate 7 and the protective plate lower brick 5a is accurately maintained while compensating for the drawbacks of the conventional furnace-clamping structure during cold and heating, and after the heating is completed. In addition, the total weight of the protective plate 7, the door frame 9, and the door 8 can be distributed and held by distributing in a certain setting range.

  In the case of the configuration shown in FIG. 5 as well, the vertical position of the adjustment nut 15 is adjusted to change the length of the spring 14 sandwiched between the support beam 11 of the protective plate 7 and the spring load adjustment nut 15. Thus, the distribution of the weight supported by the protection plate lower brick 5a and the weight supported by the backstay 6 can be adjusted.

  In the furnace tightening structure of the present invention having the configuration shown in FIGS. 1 to 5, it is possible to maintain free expansion of the brick during heating, to reduce damage to the brick, and to prevent gas leakage after heating is completed. While exhibiting an effect, it can respond also to the fluctuation | variation of the relative position of the protection board 7 and the protection board lower brick 5a resulting from the change of the brick expansion amount by the temperature change during coal carbonization, and the lifetime of a furnace can be prolonged.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

DESCRIPTION OF SYMBOLS 1 Coke oven 2 Regenerative furnace 3 Carbonization chamber 4 Combustion chamber 5 Corbel part 5a Protection plate lower brick 6 Backstay 7 Protection plate 8 Door 9 Door frame 10 Kobel duct 11 Support beam 11a Through-hole 12 Protection plate receiving beam 13 Bar 13a Screw 14 Spring 15 Adjustment nut 16 Cross tie rod 17 Cross tie rod furnace clamping spring 18 Bolt 19 Sealing material 20 Furnace clamp

Claims (6)

The doors arranged at both ends in the furnace length direction of the carbonization chambers arranged alternately with the combustion chambers in the furnace group direction are held by door frames attached to protective plates arranged at both ends of the combustion chamber in the furnace length direction, In a chamber type coke oven configured to apply a furnace clamping force in the furnace length direction of the combustion chamber via the protective plate with back stays arranged at both ends of the furnace length direction,
A furnace-clamping structure for a chamber-type coke oven, wherein the protection plate is supported in a vertical direction via a spring installed on the backstay. The vertical support of the protection plate by the spring is
A support beam is attached in a protruding manner from the protection plate toward the backstay, and a protection plate receiving beam provided with a protruding bar extending through the support beam is attached to the backstay, and the support beam and the protection plate receiving beam The coke oven furnace tightening structure according to claim 1, wherein the structure is performed by fitting a spring to an outer peripheral portion of the rod.   The coke oven furnace tightening structure according to claim 2, wherein a screw is formed on the bar and a nut for adjusting a spring load is provided between the protection plate receiving beam and the spring.   The coke oven furnace according to claim 2 or 3, wherein a gap larger than a movement amount of a backstay in the furnace length direction is provided between the support beam provided on the protective plate and the rod. Fastening structure.   The gap between the support beam provided on the protection plate and the rod is provided with a gap that is greater than or equal to the amount of movement of the backstay in the furnace group direction. Coke oven closed structure.   4. The coke oven furnace tightening structure according to claim 2, wherein the support beam is attached so as to be movable along a longitudinal direction of the rod instead of being attached in a protruding manner from the protection plate. 5.

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