JP7151283B2 - Furnace tightening structure of chamber-type coke oven - Google Patents

Description

TECHNICAL FIELD The present invention relates to a furnace clamping structure for a chamber-type coke oven.

The chamber-type coke oven is a large rectangular carbonization furnace stacked with refractory bricks as shown in FIGS. , a coke oven 1 provided with a heat storage chamber 4 in the lower half. Coking coal is put into the coking chamber 2a from a charging port 2b provided in the upper part thereof. The combustion chamber 3a is divided into a number of flame paths, where combustion gas such as blast furnace gas or coal gas is constantly burned to heat the brick walls on both sides to the required temperature. The heat storage chamber 4 recovers and utilizes the sensible heat of the combustion gas, thereby significantly saving fuel for carbonization.

By the way, in the chamber-type coke oven, it is necessary to shut down the combustion chamber 3a in order to counteract the expansion pressure of the coal filled in the coking chamber 2a. For this reason, a method of arranging the backstays 5 at both ends in the furnace length direction is conventionally known. As shown in FIG. 7(a), the backstay 5 has cross tie rods 8 arranged at its upper and lower edges for applying tension to press the backstay 5 in the furnace tightening direction. A furnace clamping force is formed by a furnace clamping spring provided at the connecting portion of the tie rod 8 . A clamping metal fitting 7 having a rod or a spring is attached to the backstay 5 between itself and a protection plate 6 disposed at the end of the combustion chamber 3a. The clamping hardware 7 is composed of a retaining portion in the backstay 5 and a spring portion connected to this retaining portion, and the tip of this spring portion is connected to the protective plate 6 and the heat storage chamber 4 . Along with this, the backstay 5 clamps the combustion chamber 3a via the clamping hardware 7 and the protective plate 6, thereby suppressing deformation of the combustion chamber 3a due to coal expansion pressure and coke cake pressure. For this reason, it is desirable that the backstay 5 is restrained from being deformed as much as possible.

Further, in the operating mode of the coke oven, an extruder 9a and a guide wheel 9b are arranged at both ends of the coke oven 1 in the oven length direction, as shown in FIG. This extruder 9a is a device for extruding the produced coke from the carbonization chamber 2a. The guide car 9b is a car body that guides the coke extruded from the coking chamber 2a to the extinguishing freight car 9c.

As described above, if the backstay 5 shown in FIG. 7(a) is furnace tightened and a load is applied, the backstay 5' is bent as shown in FIG. 7(b). At this time, the clamping hardware is in a state where a load is applied (7' in FIG. 7(b)), and the cross tie rod is also in a state where a load is applied (8' in FIG. 7(b)). Here, if the coke oven deteriorates over time with this curvature occurring, the combustion chamber expands in the furnace length direction, and as shown in FIG. Since it becomes impossible to run in the direction of the furnace group, the life until it becomes impossible to operate will be shortened.

On the other hand, as described in Patent Literature 1 and Patent Literature 2, it has been studied to maintain a constant furnace clamping force by improving the clamping hardware 7 .

JP 2016-113476 A JP-A-2004-137336

According to the study of the present inventor, neither of Patent Documents 1 and 2 has a mechanism for suppressing the initial bending of the backstay that occurs when the furnace is tightened. In addition, in order to suppress the deformation of the backstay, it is considered to be one of the effective methods to use a material with high rigidity (section modulus) for the backstay. It is difficult to adopt this method due to high cost such as upgrade.

Therefore, the present invention can always apply and maintain a constant furnace clamping force to the entire coke oven, especially the end face of the combustion chamber in the furnace length direction, and can be used in an environment with a high thermal load for a long period of time, especially at the beginning of operation. To suppress the deformation of the backstay of the coke oven, maintain the robustness of the combustion chamber, extend the oven life of the coke oven, and enable the operation of the coke oven to continue stably.

As a result of examining methods for solving the above problems, the above problems were solved by examining the shape of the backstay.
That is, the gist of the present invention is as follows.

[1] A coke oven in which a plurality of carbonization chambers for containing coal to be carbonized and combustion chambers for burning fuel gas are alternately arranged, and bags arranged at both ends in the furnace length direction of the coke oven A furnace clamping structure for a chamber furnace type coke oven in which a stay applies a furnace clamping force in the furnace length direction of the coke oven, wherein the backstay has a bow-shaped furnace clamping backstay. A furnace clamping structure for a chamber-type coke oven, which is clamped to the end face of the coke oven.

[2] Both end surfaces of the coke oven in the oven length direction and the backstay are connected by tightening members, and the tightening members connect both ends of the backstay to upper and lower edges of the end surface of the coke oven. The furnace clamping structure for a chamber hearth type coke oven according to [1], which imparts a furnace clamping force to the backstay by tightening the backstay.
[3] The furnace clamping structure for a chamber-type coke oven according to [2], wherein the clamping member has a biasing member.

As described above, in the present invention, since the backstay is arched, the middle portion in the height direction of the portion facing the combustion chamber is less likely to be curved away from the combustion chamber, and the coke oven, particularly the A constant furnace clamping force can always be applied and maintained on the entire end surfaces of the combustion chamber in the furnace length direction. Therefore, expansion of the carbonization chamber can be suppressed in an environment with a high thermal load for a long period of time, and robustness of the combustion chamber can be maintained. As a result, the life of the coke oven can be extended, and the operation of the coke oven can be stably continued for a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view showing an example of an embodiment of a chamber-type coke oven that is clamped by arcuate backstays 15 according to the present invention; FIG. 1( a ) is a partial perspective view showing an example of an embodiment of a chamber hearth type coke oven in a state before the furnace is tightened with an arcuate back stay 15 . Front sectional drawing of Fig.1 (a). Front sectional drawing of FIG.1(b). FIG. 1(a) and a partial side cross-sectional view of FIG. 1(b). (a) and (b) are side views showing examples of the shape of the backstay used in the same embodiment. Fig. 2(b) is a cutaway front view of a main part; FIG. 3 is a schematic diagram of a main part showing another example of the backstay; (a) Front sectional view showing a conventional coke oven, (b) Partial side sectional view showing a conventional coke oven. (a) Side view showing an example of a conventional buckstay, (b) Side view showing an example of a conventional buckstay bent due to furnace tightening, (c) Side view showing an example of an invented buckstay , (d) is a side view showing an example in which the invented backstay is restrained from bending even when furnace tightening is performed. The schematic diagram which shows the state which arranged the extruder, the guide car, and the fire extinguishing wagon in the coke oven. Conceptual diagram used to calculate the amount of deflection in beam calculation

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail. It should be noted that the present invention is not limited to the following description, and various modifications can be made within the scope of the gist of the present invention.

The chamber-type coke oven used in the present invention is a large rectangular carbonization furnace stacked with refractory bricks, and as shown in FIGS. It is a coke oven 11 in which a plurality of chambers 13a are alternately arranged and a heat storage chamber 14 is provided on the lower side. The coking chamber 12a is generally a rectangular parallelepiped box, into which coking coal, that is, coal to be carbonized, is charged from a charging port 12b provided at the top. Said combustion chamber 13a is divided into a number of flame paths, where combustion gases such as generator gas and coal gas are continuously burned to heat the brick walls on both sides. The heat storage chamber 14 recovers and utilizes the sensible heat of the combustion gas, thereby significantly saving fuel for carbonization. Further, the combustion chamber inspection port 13b is provided for inspecting the combustion chamber 13a.
As shown in FIGS. 1(a) and 2(a), the length direction of the coking chamber 12a is the furnace length direction, and the direction in which the coking chambers 12a and the combustion chambers 13a are arranged alternately, that is, the furnace length direction. The direction perpendicular to is called the direction of the furnace stack.

Backstays 15 are arranged at both ends of the coke oven 11 in the oven length direction, and the coke oven 11 is provided with a furnace clamping force on the end faces in the oven length direction.
As shown in FIGS. 3(a) and 3(b), the backstay 15 has both ends of a furnace-fastening backstay 15' having an arcuate shape that is curved as a whole and is fastened to the end face of the coke oven. It is. Specifically, when the furnace tightening backstay 15' having this arcuate shape is attached to the coke oven 11, as shown in FIGS. Although the upper and lower ends of the backstay 15' are separated from the coke oven 11, as will be described later, by tightening the oven, the state shown in Figs. 1(a), 2(a) and 7(d) As shown, the furnace tightening backstay 15' pushes the vicinity of the central portion of the coke oven 11, and the whole furnace tightening backstay 15' comes into close contact with the coke oven 11, forming a straight backstay. 15.

By the way, as the material of the backstay 15 (furnace tightening backstay 15'), for example, general structural rolled steel (SS material) can be adopted. Although there is no problem in use if a material having a higher strength than this is selected, it is preferable to adopt the SS material in terms of cost and procurement.

Specific examples include a furnace-closing buckstay 15'a shown in FIG. 3(a) and a furnace-closing buckstay 15'b shown in FIG. 3(b).
The furnace tightening backstay 15'a shown in FIG. 3(a) has a camber shape in which the whole is curved around the central portion, and the central portion is curved in the opposite direction, and both ends and the central portion are raised. A furnace tightening backstay 15'b shown in FIG. 3(b) is a rocker-shaped backstay, the whole being curved around the central portion. In the case of a camber shape, the raised portions at both ends may form sharp curves, but the raised portions may be gently curved like a rocker shape. The backstay 15'b shown in FIG. 3(b) is more preferable in terms of ease of processing when manufacturing the backstay 15 as a member.
By using the bow-shaped furnace clamping backstay 15', as will be described later, it is possible to apply a pressing force to the end surface of the coke oven 11 in the furnace length direction, that is, a furnace clamping force for a longer period of time. becomes.
In addition, when a force is applied in the direction opposite to the side where both ends of the backstay are, the reverse curved portion at the center of the camber-shaped furnace tightening backstay 15'a as shown in FIG. As shown in FIG. 4, a curved state without a reverse curved portion can be obtained. Therefore, when a camber-shaped backstay is attached to a protective plate 16, which will be described later, through a tightening metal fitting 17, which will be described later, as shown in FIG. It can be attached to the end of the coke oven 11 without bending.

The position of the end face of the coke oven 11 in the furnace length direction where the furnace tightening backstay 15' is disposed mainly corresponds to the position of the end face of the combustion chamber 13a in the furnace length direction. This is because the extruder and the guide wheel are connected to both end faces of the coke chamber, and product coke is discharged, so that this is not hindered. This is because the expansion of the carbonization chamber can be suppressed in the environment, and the robustness of the combustion chamber 13a can be maintained.
Moreover, as shown in FIG. 4, it is preferable to provide protective plates 16 on the outer walls of both end faces in the furnace length direction of the coke oven 11 on which the furnace tightening backstays 15' are arranged. The protective plate 16 and the furnace clamping backstay 15' are connected by clamping metal fittings 17, which will be described later. A door frame (not shown) of the door of the coking chamber may be arranged at the position of this protective plate 16, but this door frame may be used as the protective plate 16, or the protective plate 16 may be used as the protective plate 16. It may be provided overlapping with the door frame.

Both end surfaces of the coke oven 11 in the furnace length direction and the furnace clamping backstay 15' are connected by clamping metal fittings 17 and clamping members 18, as shown in FIG. As a result, the state shown in FIG. 1(b) and FIG. 2(b) is obtained.
The tightening member 18 is a member capable of tightening both ends of the furnace tightening backstay 15' to the upper edge and lower edge of the end surface of the coke oven 11, and applies a furnace tightening force to the furnace tightening backstay 15'. can be granted. The clamping member 18 may have a biasing member in order to apply this furnace clamping force to a greater extent. As an example of this tightening member 18, a cross tie rod or the like can be used which imparts tension to press the furnace tightening backstay 15' in the furnace tightening direction. The cross tie rod is provided with a furnace clamping spring that presses the furnace clamping backstay 15' against the end face of the coke oven 11 in the furnace length direction to clamp the furnace, thereby forming a furnace clamping force.

Specifically, both ends of the furnace tightening backstay 15' are separated from the end face of the coke oven 11 in the furnace length direction, and one or two points near the curved central portion of the furnace tightening backstay 15' A furnace clamping backstay 15' is arranged on the end face of the coke oven 11 in the furnace length direction so as to come into contact with the end face. Fastening members 18 are arranged at both ends of the furnace fastening backstay 15'. Then, by tightening both ends of the furnace clamping backstay 15' to the upper edge and lower edge of the end face of the coke oven 11, the straight backstay 15 is formed, and the shape of the backstay 15 is shown in FIGS. The state shown in a) is obtained. As a result, both ends of the backstay 15 (furnace tightening backstay 15 ′) can directly apply a furnace tightening force to the coke oven 11 . Also, the tightening member is in a loaded state (18' in FIG. 7(d)).

In addition, clamping metal fittings are provided at portions other than both end portions of the backstay 15 (furnace clamping backstay 15'), and these clamping metal fittings are in a state where a load is applied (Fig. 7(d). 17') of The clamping metal 17' to which the load is applied can clamp the protective member 16 (the portion without the protective member 16 is directly connected to the coke oven 11), and the furnace clamping force can be applied.

The clamping hardware 17 (loaded clamping hardware 17') consists of a retaining portion in the backstay 15 (furnace clamping backstay 15') and a rod portion and a spring portion connected to this retaining portion. The tip portions of the rod portion and the spring portion are connected to the protection plate 16 and the heat storage chamber 14 . As described above, the backstay 15 (furnace tightening backstay 15') is fastened at both ends so as to be pressed against the coke oven 11, so that the fastening hardware 17 is also pressed against the protective member 16 and the like, and a load is applied. It will be in the state of the tightening hardware 17'. At this time, if the clamping metal fitting 17 (loading clamping metal fitting 17') has an urging force, it becomes possible to push the protective member 16 more strongly, and the furnace clamping force can be strengthened.

As the clamping metal 17 (loaded clamping metal 17'), as shown in FIG. , although not shown, may include a spring portion. An example of this clamping metal 17 (loaded clamping metal 17') is a clamping device 21 as shown in FIG.
The tightening device 21 shown in FIG. 5 has a backstay 15c (a bow-shaped backstay for furnace tightening which is linearly formed by applying a furnace tightening force to the spring portion. The same applies hereinafter. ). The backstay 15c is a hollow backstay having an inner flange 23a facing the protective plate 16 and an outer flange 23b disposed far from the protective plate 16. It is the same as the backstay 15').
A spring 22 is sandwiched between a spring clamp 24 and a rod 25 . A spring clamp 24 is secured to the outer flange 23b via a spring guide rod 23. As shown in FIG. Further, the rod 25 is composed of a spring restraining flange 25a that supports the spring 22 and a rod portion 25b that presses the protection plate 16. The rod portion 25b passes through an inner flange rod guide 26 provided to penetrate the inner flange 23a. to come into contact with the protective plate 16 .
As described above, when the backstay 15c is attached, the spring 22 is compressed, and its urging force pushes the protective plate 16 via the rod portion 25b to apply the furnace clamping force.
A cylindrical cover may be attached to the spring 22 if necessary.

Also, the distance between both ends of the arcuate furnace tightening backstay 15' in the curved state and the most curved position, that is, the position near the center and farthest from both ends (Fig. 3 The ratio A/B between (a) and (b) A) and the distance between both edges of the curved furnace clamping backstay 15′ (FIG. 3(a) and (b) B) is 0.28%. 0.35% or more is preferable. If it is 0.35% or more, it tends to be advantageous in terms of long life. On the other hand, the upper limit is preferably 0.70% or less, and it is necessary to consider contact with the extruder and the guide wheel, which are moving machines for operation.

In addition, regarding the calculation of the deflection amount A of the most curved portion, when using the diagrams shown in FIGS. be able to.

1 coke oven 2a carbonization chamber 2b charging port 3a combustion chamber 4 regenerator 5 backstay 5' curved backstay 6 protective plate 7 clamping hardware 7' loaded clamping hardware 8 cross tie rod 8' loaded cross tie rod 9a Extruder 9b Guide car 9c Fire wagon 11 Coke oven 12a Coking chamber 12b Charging port 13a Combustion chamber 13b Combustion chamber inspection port 14 Heat storage chambers 15, 15c Backstays 15', 15'a, 15'b Furnace clamping backstay 16 Protection plate 17 clamping hardware 17' loaded clamping hardware 18 cross tie rod (clamping member)
18' loaded cross tie rod (clamping member)
21 tightening device 22 spring 23 spring guide rod 23a inner flange 23b outer flange 24 spring tightening hardware 25 rod 25a spring suppressing flange 25b rod portion 26 inner flange rod guide

Claims (2)

A coke oven in which a plurality of carbonization chambers for containing coal to be carbonized and combustion chambers for burning fuel gas are alternately arranged is arranged by backstays arranged at both ends in the furnace length direction of the coke oven. A furnace clamping structure for a chamber furnace type coke oven that applies a furnace clamping force in the furnace length direction of the coke oven,
Both end faces of the coke oven in the oven length direction and the backstay are connected by fastening members,
The backstay has an arcuate shape, both ends of the backstay are separated from the end faces in the furnace length direction of the coke oven, and one or two locations near the center of the backstay are attached to the coke oven. By tightening both ends of the backstay with the tightening member, the backstay is straightened, and a furnace tightening force is applied to the backstay. A furnace clamping structure for a chamber furnace type coke oven, wherein both ends of a stay are clamped to end faces of the coke oven. 2. The furnace clamping structure for a chamber hearth coke oven according to claim 1 , wherein said clamping member has a biasing member.

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