JP7684551B2 - Coke oven sole plate and sole plate assembly structure - Google Patents

Description

The present invention relates to a sole plate and sole plate assembly structure for a chamber-hearth coke oven.

The carbonization chamber of a chamber-type coke oven is made of bricks on both sides, ceiling, and bottom that contact the combustion chamber, and both ends in the longitudinal direction of the carbonization chamber are open. The ends are called the pusher side (PS) and the opposite side (guide car side, coke side, CS), respectively. A steel furnace frame (also called a furnace cover frame, door frame, kiln mouth frame, etc.) is arranged at both ends, and a removable furnace cover is provided on the furnace frame. The opening inside the frame of the furnace frame is called the kiln mouth here. The cross-sectional shape of the kiln mouth is the same as the cross-sectional shape of the brick structure of the carbonization chamber. The bottom part of the furnace frame's kiln mouth (hereinafter referred to as the "furnace frame bottom") forms part of the bottom of the carbonization chamber. If the bottom of the furnace frame is exposed, the coke pushed out during coke pushing will slide over the bottom of the furnace frame, causing wear on the bottom of the furnace frame, which is not desirable. Therefore, a sole plate is arranged to protect the bottom of the furnace frame.

The sole plate is disposed on the bottom of the coking chamber at the position where the bottom of the furnace frame and the bottom of the bricks meet, so as to cover both the bottom of the furnace frame and the bottom of the bricks. As described in Patent Document 1, for example, the part of the sole plate that is disposed on the bottom of the furnace frame has a plate-like shape, and the part that is disposed on the bottom of the bricks has legs. The top of the sole plate has the same height as the top of the bricks on the bottom of the coking chamber. The part of the brick structure on the bottom of the coking chamber where the legs of the sole plate are disposed is provided one step lower so that the legs of the sole plate can be stored. The sole plate is fixed to the bricks on the bottom of the coking chamber, and for the purpose of fixing it, the space in the legs of the sole plate is filled with an amorphous refractory material such as mortar as a joint material.

The sole plate needs to be replaced every 5 to 10 years because the upper surface of the plate wears down during coke extrusion.

Japanese Utility Model Application Publication No. 58-172448

As mentioned above, the sole plate of a conventional coke oven has a plate-like shape in the portion placed on the bottom of the furnace frame, and a structure with legs in the portion placed on the bottom of the brick section. In order to fix the sole plate to the brick surface, the space in the legs of the sole plate is filled with mortar or other unshaped refractory material as a joint material, resulting in a weight of 50 to 70 kg. For this reason, replacing a sole plate is heavy labor. Furthermore, removing the mortar that has been stuck as a joint material during replacement requires time.

The present invention aims to provide a sole plate and sole plate assembly structure for a coke oven that is lightweight and can be easily replaced by using a fixing method that does not use mortar.

The present invention also aims to provide a sole plate and sole plate assembly structure for a coke oven that can prevent the sole plate from coming off due to the coke pushing operation.

That is, the gist of the present invention is as follows.
[1] A sole plate that covers the bottom surface of the furnace mouth of the furnace frame of the carbonization chamber of a chamber-type coke oven (hereinafter referred to as the "furnace frame bottom surface") and a part of the brick bottom surface of the carbonization chamber,
A sole plate for a coke oven, characterized in that it has a plate shape with a thickness of 40 mm or less and is made of steel.
[2] The sole plate of a coke oven described in [1], characterized in that the sole plate has an opening through which a bolt can be inserted to be bolted to the bottom surface of the furnace frame.
[3] A sole plate for a coke oven as described in [1] or [2], characterized in that the upper surface side of the furnace inner end of the sole plate has a sloping portion whose surface height gradually decreases toward the furnace inner side.
[4] A sole plate for a coke oven described in any one of [1] to [3], characterized in that in addition to the plate-like shape, a convex portion that is convex downward is formed on the underside of the furnace inner end of the sole plate, and the distance from the upper surface of the sole plate to the lower end of the convex portion is 50 mm or less.

[5] A coke oven sole plate assembly structure, characterized in that a bolt is inserted through the opening of the sole plate and bolted to the bottom surface of the furnace frame using the sole plate of a coke oven described in [2] or [3].
[6] A coke oven sole plate assembly structure comprising the coke oven sole plate described in [4], a bolt being inserted through the opening of the sole plate and bolted to the bottom surface of the furnace frame, and the outer furnace surface of the convex portion being arranged facing either the inner furnace surface of the furnace frame or the inner furnace surface of a steel structure arranged on the furnace inside of the furnace frame.

The sole plate, which covers the bottom of the furnace mouth of the furnace frame of the coke oven carbonization chamber (bottom of the furnace frame) and part of the bottom of the bricks of the coke oven that contacts the furnace frame, is made of steel in a plate shape with a thickness of 40 mm or less, making it possible to provide a sole plate and sole plate assembly structure for a coke oven that is lightweight and can be easily replaced using a fixing method that does not use mortar.

1A and 1B are diagrams showing an example of a sole plate and a sole plate assembly structure of the present invention, in which (A) is a partial front view, (B) is a partial plan cross-sectional view taken along the line B-B, and (C) is a partial side cross-sectional view taken along the line C-C. FIG. 2 is a diagram showing an example of a sole plate and a sole plate assembly structure of the present invention. FIG. 2 is a diagram showing an example of a sole plate and a sole plate assembly structure of the present invention. FIG. 2 is a diagram showing an example of a sole plate and a sole plate assembly structure of the present invention.

As shown in FIG. 1, a steel furnace frame 3 is placed at the longitudinal end of the coke oven carbonization chamber 1. The opening within the furnace frame 3 is referred to as the kiln mouth 21 here. The kiln mouth 21 is surrounded by the furnace frame 3, and the cross-sectional shape of the kiln mouth 21 is the same as the cross-sectional shape of the brick structure of the carbonization chamber. The bottom part of the furnace frame 3 is referred to as the furnace frame hearth 23. The upper surface of the furnace frame hearth 23 is referred to as the furnace frame bottom surface 22. The furnace frame bottom surface 22 constitutes the bottom part of the kiln mouth 21 of the furnace frame 3, and forms part of the bottom surface of the carbonization chamber.

First, the sole plate of the coke oven of the present invention is a sole plate 2 that covers the bottom surface (furnace frame bottom surface 22) of the furnace mouth 21 of the furnace frame 3 of the coking chamber 1 of the chamber-hearth coke oven (the upper surface of the furnace frame hearth 23 shown in FIG. 1) and a part of the brick bottom surface 24 of the coking chamber 1, as shown in FIG. 2 (A), and is characterized by having a plate-like shape with a thickness of 40 mm or less and being made of steel. A conventional sole plate with legs is fixed to the brick part by legs placed on the brick part, so it has a length of about 270 mm above the brick part toward the inside of the furnace. Therefore, the sole plate has a weight of 50 to 70 kg. In contrast, the sole plate 2 of the present invention has a plate-like shape with a thickness of 40 mm or less, does not have legs, and only needs to have a length of about 50 mm above the brick part toward the inside of the furnace, so it can be lightweight at about 30 kg and can be easily replaced. The sole plate 2 is fixed to the furnace frame 3 (furnace frame hearth 23) at the part of the lower surface of the sole plate 2 that contacts the furnace frame bottom surface 22 (upper surface of the furnace frame hearth 23). Conventional sole plates are fixed to the brick surface at their legs using mortar. The sole plate 2 of the present invention does not use mortar to fix it to the furnace frame bottom surface 22. The sole plate 2 of the present invention also covers a part of the brick bottom surface 24 of the furnace outer side 32 of the carbonization chamber 1. The height of the part of the brick bottom surface 24 of the carbonization chamber 1 that is not covered by the sole plate 2 is set to the same height as the height of the upper surface of the sole plate 2 fixed to the furnace frame 3. The part of the brick bottom surface 24 of the carbonization chamber 1 that is covered by the sole plate 2 is lowered by the thickness of the sole plate 2, and the end of the furnace inner side 31 of the sole plate 2 is accommodated in the lowered part of the brick bottom surface 24.

Secondly, as a specific means for realizing the above-mentioned first feature, the sole plate 2 of the coke oven of the present invention is characterized in that, as shown in FIG. 2(B), the sole plate 2 has an opening 4, and the opening 4 can be bolted to the furnace frame bottom surface 22 by inserting a bolt 5 therethrough. The sole plate assembly structure of the coke oven using this sole plate 2 is characterized in that the sole plate 2 is bolted to the furnace frame bottom surface 22 (the upper surface of the furnace frame hearth 23) by inserting a bolt 5 through the opening 4 of the sole plate 2. The furnace frame bottom surface 22 is provided with a screw hole for screwing in the bolt 5.

As described above, the height of the part of the brick bottom surface 24 of the carbonization chamber 1 that is not covered by the sole plate 2 is set to the same height as the height of the upper surface of the sole plate 2 fixed to the furnace frame 3. As a result, when pushing coke out of the coke oven carbonization chamber, the only load toward the outside of the oven is the frictional force when the coke is pushed out, and the pushed coke and the pusher that pushes the coke can move smoothly without getting caught on the sole plate 2 at the bottom of the carbonization chamber. On the other hand, with long-term use of the coke oven, the brick part at the bottom of the carbonization chamber gradually wears out and its height gradually decreases. In particular, it was found that the brick 13 at the position in contact with the sole plate 2 on the opposite pusher side (CS) is prone to chipping. The sole plate 2 is replaced periodically, and the height of the upper surface of the sole plate 2 returns to the design height each time it is replaced. Therefore, a step gradually occurs between the height of the brick bottom surface 24 of the carbonization chamber 1 and the height of the upper surface of the sole plate 2, and the height of the brick part becomes lower. As a result, when the coke is pushed out, it gets caught on the sole plate, which is higher than the bottom surface of the bricks. In addition to the frictional force when the coke is pushed out, the force acting on the sole plate in the longitudinal direction of the carbonization chamber due to the coke getting caught can cause the area around the opening 4 (bolt hole) of the sole plate or the bolt 5 to break, causing the sole plate 2 to separate from the furnace frame 3.

Thirdly, in addition to the above-mentioned first and second features, the sole plate of the coke oven of the present invention is characterized in that, as shown in FIG. 3(A), the upper surface side of the end of the sole plate 2 on the furnace inside 31 has an inclined portion 6 whose surface height gradually decreases toward the furnace inside 31. The difference between the surface height of the end of the inclined portion 6 on the furnace outside 32 and the surface height of the end of the inclined portion 6 on the furnace inside 31 is called the "maximum height difference h of the inclined portion". When the height of the bottom surface of the bricks in the coke chamber is lowered due to wear, as long as the amount of reduction in height due to wear is smaller than the maximum height difference h of the inclined portion, the action of the inclined portion 6 prevents excessive load from being applied to the sole plate 2 even when the coke is pushed out. Therefore, it is possible to prevent the occurrence of a trouble in which the periphery of the opening 4 of the sole plate 2 or the bolt 5 breaks due to a force acting on the sole plate 2 in the longitudinal direction of the coke chamber due to a snag, causing the sole plate 2 to separate from the furnace frame 3. It is preferable that the maximum height difference h of the inclined portion is 10 mm or more.

If we were to rely solely on the bolt connections that secure the sole plate 2 to the furnace frame 3 to withstand the load acting on the sole plate 2 toward the outside 32 of the coking chamber, it would be necessary to strengthen the strength of the bolts 5 and the areas around the bolt connections. It would be more convenient to have the load acting on the sole plate toward the outside 32 of the coking chamber be received at a location other than the bolt connections.

The sole plate of the coke oven of the present invention is fourthly characterized in that, in addition to the plate-like shape of the first characteristic, as shown in Figs. 3(B) and 4, a convex portion 7 that is convex downward is formed on the lower surface side of the end of the sole plate 2 on the furnace inner side 31, and the distance from the upper surface of the sole plate 2 to the lower end of the convex portion 7 is 50 mm or less. The sole plate assembly structure of a coke oven equipped with a sole plate 2 having such a convex portion 7 is characterized in that, in addition to being bolted to the furnace frame bottom surface 22 by inserting a bolt into the opening 4 of the sole plate 2, the outer furnace surface 33 of the convex portion 7 is arranged to face either the inner furnace surface 34 of the furnace frame 3 or the inner furnace surface 34 of the steel structure 12 arranged on the furnace inner side 31 of the furnace frame 3. The present invention will be described below in relation to the structure of the bottom surface near the outlet of the coking chamber.

In Fig. 3(B), a steel structure 12A is arranged on the furnace inner side 31 of the hearth portion (furnace frame hearth portion 23) of the furnace frame 3. A backstay (not shown) is arranged on the outside of the combustion chamber portion of the chamber-type coke oven, and a protective plate 11 is arranged between the backstay and the combustion chamber (see Fig. 1). The steel structure 12A is formed by a part of the protective plate 11 protruding toward the carbonization chamber side. In the example shown in Fig. 3(B), the furnace outer surface 33 of the protruding portion 7 of the sole plate 2 is arranged facing the furnace inner surface 34 of the steel structure 12A.

In the case of FIG. 4(A), a steel structure 12B is arranged as the steel structure 12 on the furnace inner side 31 of the furnace frame hearth 23. The steel structure 12B is an independent steel member and is provided between the furnace frame 3 and the bricks 13. In the example shown in FIG. 4(A), the outer furnace surface 33 of the convex portion 7 of the sole plate 2 is arranged facing the inner furnace surface 34 of the steel structure 12B.

In the case of FIG. 4(B), the outer furnace surface 33 of the convex portion 7 of the sole plate 2 is positioned facing the inner furnace surface 34 of the furnace frame 3 (furnace frame hearth 23).

In all of Figures 3(B) and 4(A) and (B), the furnace outer surface 33 of the convex portion 7 of the sole plate 2 is positioned facing the furnace inner surface 34 of some steel structure 12, so that when the sole plate 2 receives an external force in a direction that moves it toward the furnace outer side 32, the furnace outer surface 33 of the convex portion 7 of the sole plate 2 abuts against the furnace inner surface 34 of the steel structure 12 to support the external force, thereby preventing excessive external force from acting on the bolt portion that secures the sole plate 2 to the furnace frame 3.

As for the convex portion 7 of the sole plate 2, the distance from the top surface of the sole plate 2 to the bottom end of the convex portion 7 is short, at 50 mm or less, so the increase in weight of the sole plate 2 due to the inclusion of the convex portion 7 is slight, at 3 kg or less, and the weight reduction benefit compared to a conventional sole plate with legs (weighing 50 to 70 kg) is not diminished.

Reference Signs List 1: carbonization chamber 2: sole plate 3: furnace frame 4: opening 5: bolt 6: inclined portion 7: convex portion 11: protective plate 12: steel structure 12A: steel structure 12B: steel structure 13: brick 21: kiln mouth 22: furnace frame bottom surface 23: furnace frame hearth bottom 24: brick bottom surface 31: furnace inside 32: furnace outside 33: furnace outside surface 34: furnace inside surface h: inclined portion maximum height difference

Claims (3)

A sole plate that covers the bottom surface of the furnace mouth of the furnace frame of a coke oven carbonization chamber (hereinafter referred to as the "furnace frame bottom surface") and a part of the brick bottom surface of the coke oven,
the sole plate is made of steel;
The sole plate has a plate-shaped portion, and in addition to the plate-shaped portion, a convex portion that is convex downward is formed on the lower surface side of the furnace inner end portion of the sole plate,
The thickness of the plate-shaped portion of the sole plate other than the convex portion forming portion is 40 mm or less at most , and the distance from the upper surface of the sole plate to the lower end of the convex portion is 50 mm or less,
1. A sole plate for a coke oven, comprising: an opening through which a bolt can be inserted for bolt connection to a bottom surface of the furnace frame . 2. The sole plate of a coke oven according to claim 1 , characterized in that the sole plate has an inclined portion on its upper surface at the end portion on the inside of the furnace, the surface height of which gradually decreases toward the inside of the furnace. A coke oven sole plate assembly structure comprising a coke oven sole plate as described in claim 1 or claim 2 , and a bolt inserted through the opening in the sole plate to bolt it to the bottom of the furnace frame, the outer furnace surface of the convex portion being arranged facing either the inner furnace surface of the furnace frame or the inner furnace surface of a steel structure arranged on the furnace inside of the furnace frame.

Images