JP2016113476A - Method for tightening oven body of coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit the oven tightening force of a coke oven uniformly in a height direction of a combustion chamber.SOLUTION: Provided is a method for tightening an oven body of a coke oven 1, in which oven tightening force obtained through oven tightening springs 11 disposed at both ends of cross tie rods 10 is applied in the oven length direction of a combustion chamber 4 via oven tightening hardwares 12 facing the combustion chamber 4, provided on a plurality of steps in the height direction of a portion on the combustion chamber side of backstays 5 connected by the cross tie rods 10, and also two each provided in a coke oven battery direction as well as door frames 6 and protection plates 7 arranged at both ends in the oven length direction of the combustion chamber 4. Oven tightening transmission devices 21 are penetrated into openings 5a of the backstays 5, disposed between the door frames 6 and the oven tightening hardwares 12. The oven tightening force is transmitted to the door frames 6 from the oven tightening hardwares 12 via the oven tightening transmission devices 21.EFFECT: Since the oven tightening force is always uniformly pressed on a brick structure of the combustion chamber, the life of the coke oven can be prolonged.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tightening method capable of uniformly transmitting a tightening force of a furnace body in a chamber furnace type coke oven (hereinafter simply referred to as “coke oven”) in the height direction of the combustion chamber.

A cross-sectional view of the coke oven in the furnace length direction is shown in FIG.
The coke oven 1 is a structure constructed of bricks, and a heat storage chamber 2 for preheating fuel gas and combustion air is provided at the bottom of the furnace body using sensible heat of combustion exhaust gas. In the upper part, combustion chambers 4 for burning fuel gas and carbonization chambers 3 for dry distillation of coal are alternately arranged.

  The front-rear direction perpendicular to the paper surface in FIG. 6 in which the combustion chamber 4 and the carbonization chamber 3 overlap is referred to as the furnace group direction, and the left-right direction in FIG.

  The combustion chamber 4 is divided into 25 to 30 flues in the furnace length direction, and these flues are also constructed of a brick structure. In FIG. 6, a part (5 flues) of the combustion chamber 4 is shown in the same cross section as the carbonization chamber 3 for explanation. The combustion heat generated when the fuel gas is burned in the combustion chamber 4 is transmitted to the carbonization chamber 3 through the furnace wall of the combustion chamber 4 to dry-distill the coal charged in the carbonization chamber 3.

  A coke oven, which is a brick structure constructed of bricks as described above, has a structure in which a furnace body is tightened from the outside in order to hold the brick structure. The furnace body clamping force in the coke oven is hereinafter referred to as “furnace body clamping force” or “furnace clamping force”.

  As shown in FIG. 6, a pair of backstays 5 for applying a furnace clamping force are disposed at both ends of each combustion chamber 4 in the furnace length direction of the brick structure in which the combustion chamber 4 and the carbonization chamber 3 are constructed. ing. Between the backstay 5 and the combustion chamber 4, a door frame 6 for holding a furnace lid (not shown) and a protective plate 7 for attaching the door frame 6 are provided, and the furnace clamping force from the backstay 5 It is transmitted to the combustion chamber 4 and the carbonization chamber 3 which are brick structures through the frame 6 and the protective plate 7.

FIG. 7 is a diagram schematically showing a method for transmitting the furnace clamping force.
Back stays 5 disposed at both ends of each combustion chamber 4 in the furnace length direction are connected by cross tie rods 10 at two locations close to the upper and lower ends of the coke oven 1 in the height direction, and are attached to both ends of the cross tie rod 10. A furnace clamping force is applied by the furnace clamping spring 11 thus formed.

  The furnace clamping force is burned as a brick structure through the door frame 6 and the protective plate 7 by the furnace clamps 12 installed in a plurality of stages in the height direction in the portion of the backstay 5 facing the combustion chamber 4. It is transmitted to the chamber 4 and the carbonization chamber 3.

The method for transmitting the furnace clamping force will be described in more detail with reference to FIG.
FIG. 8 is a cross-sectional view of the attachment portion of the furnace clamp 12 in the coke oven 1 in the horizontal direction. 8 indicates the furnace length direction, the upper side of the paper indicates the outside of the furnace, and the lower side of the paper indicates the inner side of the furnace. In addition, the horizontal direction in FIG. 8 indicates the furnace group direction.

  Two furnace clamps 12 installed in a plurality of stages are arranged on each side of the back stay 5 on the left and right sides in the furnace group direction, and are attached with a predetermined load by built-in springs 12a. This load is transmitted to the brick structure 20 that constructs the combustion chamber 4 via the door frame 6 and the protective plate 7.

  In general, for each of the backstays 5 that form a pair, the furnace clamp 12 has six stages in the height direction of the combustion chamber 4 and two pieces each on the left and right sides in the furnace group direction, as shown in FIG. A total of 12 are installed.

  By the way, when a coke oven starts operation, it operates for a long period of 30 to 50 years, and during that time, coal is carbonized at a high temperature to continue producing coke. In particular, the backstay that transmits the furnace clamping force of the cross tie rod cannot be curved so that the intermediate portion in the height direction of the portion facing the combustion chamber separates from the combustion chamber due to long-term use.

  In such a situation, the distance between the backstay 5 and the door frame 6 (dimension L1 in FIG. 8) increases, the spring 12a of the furnace clamp 12 is loosened, and the furnace clamping force decreases.

  When the furnace clamping force decreases, the furnace clamping force of the furnace clamp 12 provided in the height direction at the portion of the backstay 5 facing the combustion chamber 4 is not uniform, and the height of the portion facing the combustion chamber 4 is not uniform. The furnace clamping force of the furnace clamp 12 located in the middle in the direction is extremely reduced. This reduction in the furnace clamping force impairs the robustness of the combustion chamber 4 constructed of bricks, leading to a reduction in the furnace life of the coke oven 1.

  In addition, when the furnace clamping force of one of the furnace clamps arranged on the left and right sides of the combustion chamber in the furnace group direction decreases due to the above reasons, the furnace clamping force can be applied only with the other furnace clamp. A non-uniform furnace clamping force will act on the brick structure of the combustion chamber. Due to this non-uniform furnace clamping force, there is a risk that the brick structure will be deformed.

  In addition, as described above, the door frame is a member that holds the furnace lid installed in the carbonization chamber, the end of the door frame projects to the combustion chamber side, and the furnace clamp presses the door frame directly from the backstay. It is a structure.

  Therefore, the furnace clamps are arranged at a position close to the carbonization chamber in the furnace group direction (left and right direction in FIG. 8), and when discharging the high-temperature coke from the carbonization chamber, There is a risk that the temperature of the clamp becomes high and the built-in spring is thermally deteriorated.

  Therefore, Patent Document 1 discloses an apparatus that maintains a constant furnace clamping force by a pressurizing mechanism using hydraulic pressure or pneumatic pressure instead of obtaining a furnace clamping force by a furnace clamp by a spring.

  The apparatus disclosed in Patent Document 1 has an advantage that a constant furnace clamping force can be applied to the combustion chamber regardless of the deformation of the backstay. However, when compared with furnace clamps, the equipment cost is high. The number of carbonization chambers and combustion chambers per coke oven is usually 40 to 50. Even if six furnace clamping devices are arranged on the backstays at both ends of the combustion chamber, the number is 480 to 600. Capital investment.

  Also, since it is used in an environment where high temperature coke is discharged during operation or a high temperature carbonization chamber is opened, a fire accident may occur if hydraulic fluid, which is often used as a pressurized medium, leaks. There is also a risk involved.

  Patent Document 2 discloses a technique that utilizes heat transfer from a coke oven without using a furnace clamp. That is, by covering the portion of the backstay that contacts the protection plate with a heat insulating material, thermal distortion is generated due to the temperature difference between the portion covered with the heat insulating material and the opposite side portion, and the height of the portion facing the combustion chamber is increased. This prevents the middle portion in the vertical direction from being bent away from the combustion chamber.

  However, the method disclosed in Patent Document 2 uses thermal strain. Therefore, if the temperature difference between the front and back of the backstay fluctuates due to changes in dry distillation temperature due to changes in the operating rate of the coke oven, seasonal fluctuations in the summer and winter, cooling in the rain, etc., the amount of deformation of the backstay will naturally change. Therefore, it is difficult to keep the furnace clamping force to the combustion chamber constant at all times.

  Moreover, a general heat insulating material retains many pores in its interior to ensure a heat insulating function. If dust generated during coke production or tar in the coke oven gas penetrates into the pores, the heat insulation performance gradually deteriorates, and the thermal conductivity is gradually promoted, and the backstay is deformed so that it separates from the combustion chamber. And the furnace tightening force is excessively applied to the intermediate portion in the height direction of the combustion chamber. If this happens, there is a risk of damage to the combustion chamber bricks.

Japanese Utility Model Publication No. 55-116051 Japanese Patent Laid-Open No. 3-287692

  The problem to be solved by the present invention is that the methods disclosed in Patent Documents 1 and 2 aiming to maintain a constant furnace clamping force at all times have the following problems.

  That is, the method disclosed in Patent Document 1 requires a large amount of capital investment and has a risk of causing a fire accident when hydraulic fluid leaks.

  Further, since the method disclosed in Patent Document 2 uses thermal strain, it is difficult to keep the furnace clamping force to the combustion chamber constant at all times, and damage to the combustion chamber bricks is caused when the heat insulation performance deteriorates. There is a risk of being connected.

  The present invention can transmit the coking oven furnace clamping force uniformly to the brick structure constituting the combustion chamber in the height direction in the portion facing the combustion chamber, and also in an environment where the thermal load is high for a long time. The purpose is to be able to continue stably.

The present invention
To achieve the above objective,
Combustion on the combustion chamber side of the backstay, which is placed outside the furnace at both ends in the furnace length direction of each combustion chamber of the coke oven and connected by cross tie rods installed at two locations close to the upper and lower ends in the height direction of the coke oven The furnace clamping force obtained by the furnace clamping springs provided at both ends of the cross tie rod is installed in a portion facing the chamber in a plurality of stages in the height direction and two each in the furnace group direction. In the method of tightening the furnace body of the coke oven, which is applied in the furnace length direction of the combustion chamber through the door frame and the protective plate disposed at both ends of the metal clamp, the furnace length direction of the combustion chamber,
A furnace clamping transmission device is passed through the opening of the backstay between the door frame and the furnace clamp, and the furnace clamping force is transmitted from the furnace clamp to the door frame via the furnace clamp transmission device. The most important feature is to do this.

  In the present invention, the furnace clamping force transmitted from the furnace clamp to the door frame is transmitted via a furnace clamp transmission device that penetrates the opening of the backstay provided between the door frame and the furnace clamp. ing.

  Therefore, the furnace clamp can be installed at a position away from the carbonization chamber in the direction of the furnace group, that is, at a position closer to the center of the combustion chamber in the combustion chamber direction. Therefore, the thermal deterioration of the spring of the furnace clamp due to the high temperature from the carbonization chamber. Can be suppressed.

  Moreover, even if the furnace clamping force of one of the two furnace clamps installed in the furnace group direction decreases, the furnace clamping force of the remaining furnace clamps is transmitted to the door frame via the furnace clamp transmission device. A non-uniform load does not act on the brick structure of the combustion chamber.

  In the present invention, the furnace clamping force is transmitted from the furnace clamp to the door frame via the furnace clamp transmission device that is passed through the opening provided between the door frame and the furnace clamp in the backstay. The furnace clamping force is always pressed evenly against the brick structure, and the coke oven life can be extended.

It is sectional drawing which looked at the attachment part of the furnace clamp thing in the furnace body fastening method of this invention from the horizontal direction. It is the figure which looked at the vicinity of the furnace clamp in the furnace body fastening method of this invention from the furnace group direction. It is an arrow AA figure of FIG. It is a figure explaining the function which adjusts the change of the distance between a door frame and a backstay in the furnace tightening transmission apparatus used for the furnace body fastening method of this invention. It is a perspective view which shows the principal part of the coke oven fastened with the furnace body fastening method of this invention. It is sectional drawing of the furnace length direction of a coke oven. It is the figure which showed typically the transmission method of the furnace clamping force from a backstay. It is a figure similar to FIG. 1 in the conventional furnace body fastening method.

  The present invention can uniformly transmit the furnace clamping force transmitted from the furnace clamp to the door frame to the brick structure of the combustion chamber in the height direction at the portion facing the combustion chamber, and can be subjected to a thermal load for a long period of time. It achieves the objective of continuing stably even in high environments.

  Then, the furnace clamping force for transmitting the object from the furnace clamp to the door frame is transmitted via a furnace clamp transmission device that penetrates an opening provided between the door frame and the furnace clamp in the backstay. That was realized.

  Hereinafter, the furnace body fastening method of the present invention will be described with reference to FIGS. 6 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present invention, in order to apply the furnace clamping force, a plurality of stages are installed in the height direction of the combustion chamber 4 at a portion facing the combustion chamber 4 of the backstay 5 (FIG. 5 shows an example in which seven stages are installed). It is characterized in that the door frame 6 is not directly pressed by the furnace clamp 12.

  That is, in the present invention, the backstay 5 of each stage is connected via the furnace tightening transmission device 21 penetrating the opening 5a provided between the door frame 6 and two furnace clamps 12 installed in the furnace group direction. Thus, the door frame 6 is indirectly pressed.

  However, the furnace clamping force is transmitted from the protective plate 7 to the brick structure 20 of the combustion chamber 4 via the door frame 6 as in the conventional method.

  In the example shown in FIG. 1, the back stay 5 employs a so-called double H-shaped steel, but an H-shaped steel or the like may be employed. In the H-shaped steel, two H-shaped vertical cross sections are called flanges and one horizontal is called a web. The double H-shaped steel has two webs as compared with a normal H-shaped steel.

  As shown in FIG. 1, the backstay 5 is installed so that the flange 5b is in the furnace group direction and the web 5c is in the direction along the furnace length direction. The opening 5a provided in the back stay 5 is formed by opening the web 5c of the back stay 5, and the furnace tightening transmission device 21 is installed through the opening 5a.

  FIG. 2 is a view of the vicinity of the furnace clamp 12 according to the present invention as viewed from the furnace group direction. The vertical direction of the paper is the furnace length direction, the upper side of the paper is the outer side of the furnace, and the lower side of the paper is the inner side of the furnace. Moreover, FIG. 3 is an arrow AA figure of FIG.

  As shown in FIG. 2, the furnace clamp 12 is installed such that the outside of the furnace is in contact with the flange 5 b on the outside of the backstay 5, and the inside of the furnace is in contact with the main body 21 a of the furnace tightening transmission device 21.

  The furnace clamping transmission device 21 is configured to receive the furnace clamping force from the pair of left and right furnace clamps 12 installed at the same height level, so that the main body 21a penetrates the opening 5a of the backstay 5. Both ends are provided with tip portions 21b that come into contact with the door frame 6. Therefore, the main body portion 21a of the furnace tightening transmission device 21 has a length that is a size obtained by adding the pair of tip portions 21b to the inner dimension L2 between the door frames 6.

  In addition, the material of the furnace clamping transmission apparatus 21 employs, for example, a general structural rolled steel (SS material). Even if a material with higher strength is selected, there is no problem in use, but it is preferable to use an SS material from the viewpoint of cost and procurement.

  It is desirable that the furnace tightening transmission device 21 has a function capable of adjusting a change in the distance L1 between the door frame 6 and the backstay 5.

  For this purpose, the front end portion 21b of the furnace clamping transmission device 21 is not a simple structural member, but is fixed to the main body portion 21a and the member 21ba fixed to the main body portion 21a by welding or the like, as shown in FIG. What is necessary is just to make it possible to adjust the relative position of the members 21ba and 21bb in the furnace length direction (up and down direction in the drawing of FIG. 1), for example, by about 30 to 50 mm.

  For example, in FIG. 4, the member 21ba fixed to the main body portion 21a is formed in a cylindrical shape and a male screw is formed on the outer periphery thereof, while the member 21bb not fixed to the main body portion 21a is formed in a cylindrical shape with a female screw fitted to the male screw. doing. The member 21bb may be cylindrical, but from the viewpoint of protecting the screw portion in a dust environment, it is preferable to have a socket shape having a bottom portion as shown in FIG.

  As described above, if the front end portion 21b of the furnace tightening transmission device 21 is configured, even if the backstay 5 is curved and the dimension indicated by L1 in FIG. 1 is enlarged, the fitting amount of the male screw and the female screw is increased. Only by adjusting and adjusting so as to be shortened by the enlarged dimension of L1, the dimension L3 of the furnace clamp 12 can be kept constant, and the furnace clamping force does not change.

  In the present invention, by installing the furnace clamping transmission device 21, the furnace clamp 12 can be installed at a position near the center of the combustion chamber 4 in the combustion chamber 4 away from the carbonization chamber 3. It is possible to suppress deterioration of the force of the spring 12a of the furnace clamp 12 due to the above.

  Even if the furnace clamping force of one of the furnace clamps 12 arranged in the furnace group direction decreases, the other furnace clamping force is applied in the furnace group direction via the furnace clamping transmission device 21. Thus, an uneven load on the brick structure 20 of the combustion chamber 4 is prevented.

  The present invention is not limited to the above examples, 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 4 Combustion chamber 5 Backstay 5a Opening 6 Door frame 7 Protection plate 10 Cross tie rod 11 Furnace clamp spring 12 Furnace clamp 21 Furnace clamp transmission device 21a Body 21b Tip 21ba Member 21bb Member

Claims (2)

Combustion on the combustion chamber side of the backstay, which is placed outside the furnace at both ends in the furnace length direction of each combustion chamber of the coke oven and connected by cross tie rods installed at two locations close to the upper and lower ends in the height direction of the coke oven The furnace clamping force obtained by the furnace clamping springs provided at both ends of the cross tie rod is installed in a portion facing the chamber in a plurality of stages in the height direction and two each in the furnace group direction. In the method of tightening the furnace body of the coke oven, which is applied in the furnace length direction of the combustion chamber through the door frame and the protective plate disposed at both ends of the metal clamp, the furnace length direction of the combustion chamber,
A furnace clamping transmission device is passed through the opening of the backstay between the door frame and the furnace clamp, and the furnace clamping force is transmitted from the furnace clamp to the door frame via the furnace clamp transmission device. A method for fastening a furnace body of a coke oven, characterized in that:   The furnace tightening transmission device has an adjustment function capable of making the distance between the furnace tightening transmission device and the furnace clamp metal constant even when the distance between the door frame and the backstay changes. The method of tightening a coke oven furnace body according to claim 1, wherein the coke oven is tightened.

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