JP6579337B2 - Coke oven cooling method - Google Patents

Description

  The present invention relates to a coke oven cooling method for efficiently cooling a high temperature brick and thus a coke oven body, for example, when disassembling an aging coke oven.

  In order to dismantle an aging coke oven, it is necessary to disassemble the cooled coke oven with a heavy machine after cooling the brick that is 1000 ° C. or more constituting the coke oven (for example, Patent Document 1). .

  Conventionally, when cooling a coke oven, the combustion gas supplied to the coke oven is stopped to stop the combustion, and the coke oven is naturally cooled. In addition, by removing the furnace lid and charging hole lid, which enhances the heat retention of the coke oven, outside air is introduced into the coke oven by natural air suction using a natural draft, and the cooling rate is increased. ing.

Japanese Unexamined Patent Publication No. 2015-013937

  Among the above-described cooling methods for the coke oven, in the cooling by heat radiation by stopping the combustion gas, there is a problem that it takes a considerable time until the coke oven dismantling starts in the heavy machinery. In addition, by removing the furnace lid, charging hole lid, etc., in the cooling that accelerates the cooling rate by sucking outside air with a natural draft, if the carbonization chamber to be cooled is not deteriorated and is all healthy, Removing the furnace lid and charging hole lid was effective without any problems. However, in an old coke oven, there is a problem that the entire coke oven collapses due to the collapse of the brick due to the damaged portion of the carbonization chamber brick that supports the ceiling or the perforated portion that occurs in the furnace wall of the coke oven. It was.

  In the cooling method of removing the furnace lid and the charging hole lid, in order to prevent collapse of the entire coke oven due to brick collapse, it is also considered to prevent the brick collapse by filling the coking chamber with a refractory. However, in this case, it is necessary to perform cooling with the furnace lid attached to the carbonization chamber where the brick may collapse, and there is a problem that the cooling rate is slow.

  An object of the present invention is to propose a method for cooling a coke oven that is effective in efficiently cooling (short time) high-temperature bricks when cooling the coke oven and shortening the time for dismantling the coke oven.

  As a result of diligent research in order to solve the above-mentioned problems of the prior art and realize the above-mentioned object, the inventors have developed a novel coke oven cooling method described below. That is, according to the present invention, when cooling the coke oven, the furnace lids are removed from both ends of the carbonization chamber which may collapse, and the outflow prevention walls having air permeability and heat resistance are provided at both ends of the carbonization chamber. A cooling method for a coke oven, which is characterized by filling a room with a filled refractory having heat resistance and cooling the entire coke oven.

In the coke oven cooling method according to the present invention configured as described above,
(1) The filling of the filled refractory is carried out after re-installing the furnace lid on the filling outflow prevention walls at both ends of the carbonization chamber, and the furnace lid is removed again from both ends of the carbonization chamber after filling with the filled refractory. Cooling the entire coke oven,
(2) The filling outflow prevention wall is a brick wall assembled in a lattice shape,
(3) The filled refractory is a block brick,
Is considered to be a more preferable solution.

  According to the method for cooling a coke oven of the present invention, a filler outflow prevention wall having air permeability and heat resistance is installed in advance in the carbonization chamber side of the furnace lid in the carbonization chamber where brick may collapse. Even if the refractory is filled in the carbonization chamber, the furnace lid can be removed when the coke oven is cooled. Therefore, compared with the conventional method which needed to cover the carbonization chamber filled with the filled refractory, the high-temperature brick constituting the carbonization chamber can be cooled in a short time. As a result, it is possible to shorten the time for dismantling the coke oven.

It is a figure for demonstrating an example of the coke oven used as the application object of this invention. (A), (b) is a figure for demonstrating an example of the carbonization chamber which should respectively provide a packing outflow prevention wall in the cooling method of this invention. (A)-(e) is a figure for demonstrating one Example of each process of the cooling method of the coke oven which concerns on this invention, respectively. (A)-(f) is a figure for demonstrating the other Example of each process of the cooling method of the coke oven which concerns on this invention, respectively. (A)-(c) is a figure for demonstrating an example of the filling outflow prevention wall 41 used with the cooling method of the coke oven of this invention, respectively. In an Example, it is the graph which calculated | required the relationship between furnace body temperature and elapsed days with respect to this invention example and a prior art example.

<Coke oven to which the present invention is applied>
FIG. 1 is a diagram for explaining an example of a coke oven to which the present invention is applied. In the example shown in FIG. 1, the coke oven 1 is a structure (furnace group) in which a carbonizing chamber 2 for charging coal and a combustion chamber 3 for heating the carbonizing chamber 2 are alternately arranged. In the carbonization chamber 2, the coal charged from the upper charging hole 32 is steamed (dry-distilled) to produce coke. The produced coke is detachably attached to the front and rear ends of the carbonization chamber 2, the furnace cover 4 closing the carbonization chamber is opened, and the coke is extruded from the carbonization chamber 2 by extruding it in the horizontal direction by an unillustrated extrusion ram. It is taken out.

  A heat storage chamber 5 is integrally provided at the lower portion of the combustion chamber 3, and the fuel gas 6 is combusted by the air 13 by the combustion chamber 3 and the heat storage chamber 5 to be discharged outside the coke oven 1 as combustion exhaust gas 7. By doing so, the adjacent carbonization chamber 2 is heated to a temperature at which coal is carbonized. The coke oven 1 having the above configuration has high coal processing capacity, good thermal efficiency, and high strength coke.

  In the coke oven 1 having the configuration shown in FIG. 1, as shown in FIG. 2, the combustion chamber 3 and the heat storage chamber 5 are divided into a combustion-cooling side and a heating side in the length direction. The fuel gas 6 and the combustion gas combusted by the wall 12 are divided into (combustion side of the heat storage chamber 5) → (combustion side of the combustion chamber 3) → (combustion chamber 3) as indicated by arrows in FIG. The side of the carbonization chamber 2 is heated to a temperature for dry distillation of the coal, for example, about 1100 ° C. And if this state is continued for about 20 to 30 minutes, the flow of gas is reversed and the combustion and the exhaust gas are switched, and the operation of repeating the heating by switching the combustion side and the withdrawal side is performed.

  The life of the coke oven 1 is generally 30 to 50 years, and the coke oven 1 that has passed its life is dismantled. In the dismantling, the coke oven 1 including the high-temperature carbonization chamber must be cooled. Since it takes time to cool the coke oven 1, it has been desired to develop a technique for shortening the time required for cooling. The cooling method of the coke oven of the present invention is preferably applied to such cooling before the dismantling of the coke oven 1, and the cooling time of the coke oven 1 can be made shorter than before.

<About the carbonization chamber to which the present invention is applied>
2 (a) and 2 (b) are diagrams for explaining an example of a carbonization chamber in which a filler outflow prevention wall is to be provided in the coke oven cooling method of the present invention. In the example shown in FIG. 2A, an example is shown in which a perforated portion 21 exists in the furnace wall 2 a of the brick in the longitudinal direction of the carbonization chamber 2. Such a perforated portion 21 can be visually confirmed from the kiln opening of the carbonization chamber. In the example shown in FIG. 2B, an example in which the damaged portion 22 exists in the ceiling portion 2b of the carbonizing chamber 2 is shown. The ceiling portion 2b of the carbonization chamber is generally composed of a multi-tiered brick product, and the damaged portion 22 in FIG. 2 (b) is collapsed due to the loss of support of a part of the brick product. Expresses the state that is easy. In any example, when the carbonization chamber 2 is cooled as it is, the entire coke oven collapses due to the collapse of the bricks constituting the carbonization chamber 2 during the cooling, and the work is performed in the vicinity of the ceiling portion of the carbonization chamber 2 or in the vicinity during the cooling. There was a risk that the workers doing the work would be in danger.

  In the coke oven cooling method of the present invention, a cooling method in which outside air is circulated through the carbonization chamber by removing the furnace lid of the carbonization chamber is a principle. Then, the inside of the furnace lid is filled in the carbonization chamber, which is damaged and has a possibility of collapsing the carbonization chamber, and which needs to be filled with filled refractory. An anti-spill wall is provided. Therefore, it is not necessary to provide a packing outflow wall in a healthy carbonization chamber that is not damaged.

<About each process of the cooling method of the carbonization chamber of this invention>
FIGS. 3A to 3E are diagrams for explaining an example of each process of the coke oven cooling method according to the present invention. In the cooling method of the coke oven of the present embodiment, when cooling the coke oven, the furnace lid is removed from both ends of the carbonization chamber that may collapse, and the outflow prevention of the filler having air permeability and heat resistance at both ends of the carbonization chamber is performed. A wall is provided, and the refractory material having heat resistance is filled in the carbonization chamber, and the entire coke oven is cooled.

  Each process of the cooling method of the coke oven of a present Example is demonstrated below according to Fig.3 (a)-(e). In addition, in the example shown to Fig.3 (a)-(e), although only one edge part of the carbonization chamber is shown, the same operation is performed also in the other edge part. First, as shown in FIG. 3 (a), a carbonization chamber 2 having a possibility of collapse is specified. In this example, it is assumed that a holed portion exists in the furnace wall of the carbonization chamber 2. Next, as shown in FIG.3 (b), the furnace cover 31 is removed from the carbonization chamber 2 identified as having possibility of collapse. Next, as shown in FIG. 3 (c), filling outflow prevention walls 41 having air permeability and heat resistance are provided at both ends of the carbonization chamber 2. Details of the filling outflow prevention wall 41 will be described later. Next, as shown in FIG. 3 (d), the filling refractory 33 is filled into the carbonization chamber 2 from the charging hole 32 in the ceiling portion. The filled refractory 33 is filled to a height near the ceiling portion of the carbonization chamber 2. Finally, as shown in FIG. 3 (e), the furnace lid 31 is removed from both ends of the carbonization chamber 2 that may collapse, and from both ends of another healthy carbonization chamber 2. The whole coke oven 1 is cooled in a state where is removed.

  4 (a) to 4 (f) are diagrams for explaining other examples of the respective steps of the coke oven cooling method according to the present invention. In the cooling method of the coke oven of the present embodiment, when cooling the coke oven, the furnace lid is removed from both ends of the carbonization chamber that may collapse, and the outflow prevention of the filler having air permeability and heat resistance at both ends of the carbonization chamber is performed. After installing the walls, reattaching the furnace lids to the packing spill prevention walls at both ends of the carbonization chamber, filling the carbonization chamber with heat-resistant filling refractories, removing the furnace lids from both ends of the carbonization chamber, and then coke oven Cool the whole thing.

  Each process of the cooling method of the coke oven of a present Example is demonstrated below according to Fig.4 (a)-(f). First, as shown in FIG. 4 (a), a carbonization chamber 2 having a possibility of collapse is specified. In this example, it is assumed that a holed portion exists in the furnace wall of the carbonization chamber 2. Next, as shown in FIG.4 (b), the furnace cover 31 is removed from the carbonization chamber 2 identified as the possibility of collapse. Next, as shown in FIG. 4 (c), a filler outflow prevention wall 41 having air permeability and heat resistance is provided at both ends of the carbonization chamber 2. Details of the filling outflow prevention wall 41 will be described later. Next, as shown in FIG. 4 (d), the furnace lid 31 is attached again to the filler outflow prevention walls 41 at both ends of the carbonization chamber 2. Next, as shown in FIG.4 (e), the filling refractory material 33 is filled in the carbonization chamber 2 from the insertion hole 32 of a ceiling part. The filled refractory 33 is filled to a height near the ceiling portion of the carbonization chamber 2. Finally, as shown in FIG. 4 (f), after removing the furnace lid 31 again from both ends of the carbonization chamber 2, the coke oven is removed from both ends of the other healthy carbonization chamber 2. Cool the whole of 1.

  In the embodiment shown in FIGS. 4A to 4F, the carbonization chamber 2 is charged with carbonized refractory 33 as compared with the embodiment shown in FIGS. 3A to 3E. Since the furnace lid 31 exists not only at the both ends of the chamber 2 but also at the outer side of the filling material outflow prevention wall 41, the filling refractory 33 is suitably filled into the carbonization chamber 2 regardless of the strength of the filling material outflow prevention wall 41. can do.

  FIGS. 5A to 5C are views for explaining an example of the filling outflow prevention wall 41 used in the coke oven cooling method of the present invention. In the example shown in FIG. 5A, the filling outflow prevention wall 41 is configured by fixing a plate-like or rectangular parallelepiped brick 51 with a mortar and assembling it. In this example, when the brick 51 is assembled, the opening 52 is configured to ensure air permeability, and heat resistance can be ensured by using the brick. In the example shown in FIG. 5 (b), the brick outflow prevention wall 41 is configured by fixing and assembling a brick block 54 with a mortar having the same size as the width of the carbonization chamber 2 and having an opening 53. In this example, air permeability is ensured by the opening 53 of the brick block 54, and heat resistance can also be secured by using the brick. In the example shown in FIG. 5C, the checker brick 56 having the opening 55 is fixed and assembled with a mortar to constitute the filling outflow prevention wall 41. In this example, air permeability can be secured by the opening 55 of the checker brick 56, and heat resistance can be secured by using the brick.

  In the above-described example, although depending on the size of the carbonization chamber 2, the thickness of the plate-like or rectangular parallelepiped brick 51 is about 40 mm, and the length and width are appropriately determined according to the packing material outflow prevention wall 41 constituting the same. select. At this time, in order to maintain the strength of the filler outflow prevention wall 41, it is preferable that the end portion of the brick 51 arranged in the horizontal direction is disposed so as to contact the inner wall of the carbonization chamber. Moreover, the brick 51 arrange | positioned in the horizontal direction may be divided | segmented into two at the position of the brick arrange | positioned at the vertical direction in the center of the width direction of a carbonization chamber. Moreover, although the example of the brick was shown as a material in any filling outflow prevention wall 41, in the cooling method of the coke oven of the present invention, if it has air permeability and heat resistance and can constitute a predetermined opening, Other materials can also be used.

  Further, as the filled refractory 33, a block brick having a particle size of about 50 mm can be used. As the filled refractory material 33, it is preferable to use a block brick 33 that can secure a porosity so that air permeability and heat resistance can be secured in the carbonization chamber 2 even when the carbonization chamber 2 is filled. Moreover, although the example of the brick was shown as a material of the filling refractory 33, in the cooling method of the coke oven of the present invention, if it has air permeability and heat resistance and can secure a sufficient porosity when filled, Other materials can also be used.

  However, when brick is used as the filling outflow prevention wall 41 and the filled refractory 33, it can be demolished together with a coke oven made of brick at the time of dismantling and discarded or reused as it is. Therefore, it is preferable to use brick as a material for the filling outflow prevention wall 41 and the filling refractory 33. The sizes of the openings 52, 53, and 55 of the filling material outflow prevention wall 41 are set such that the filled refractory material 33 to be filled does not pass through the opening.

  According to the above-described method for cooling a coke oven of the present invention, a filler outflow prevention wall having air permeability and heat resistance is installed in advance in the carbonization chamber side of the furnace lid in the carbonization chamber where the brick may collapse. Therefore, even if the refractory is filled in the carbonization chamber, the furnace lid can be removed when the coke oven is cooled. Therefore, the carbonization chamber composed of high-temperature bricks can be cooled in a short time compared to the conventional method in which it is necessary to cover the carbonization chamber filled with the filled refractory. As a result, it is possible to shorten the time for dismantling the coke oven.

  Actually, a coke oven in which some of the carbonization chambers are damaged and filled with a refractory filling is cooled according to the cooling method of the coke oven of the present invention shown in FIGS. 3 (a) to 3 (e). An example of the present invention in which a coal outflow prevention wall having the structure shown in FIG. 5 (a) is provided at both ends of a carbonizing chamber, the brick is filled in the carbonizing chamber, the furnace lid is removed, and the coke oven is cooled, and the conventional coke. According to the cooling method of the furnace, compared to the conventional example in which the coke oven was cooled with the furnace lids being filled and the coke oven was cooled with the furnace lids attached to both ends of the damaged carbonization chamber, Sought the relationship. In addition, as a coke oven used in the present embodiment, a coke oven in which 14 carbonization chambers of 43 carbonization chambers are damaged and filled with a filled refractory in the present invention example and the conventional example. Using. The results are shown in FIG.

  From the results of FIG. 6, the cooling rate of the example of the present invention with the furnace lid removed is 99 ° C./day, whereas the cooling rate of the conventional example with the furnace lid attached is 36 ° C./day. It was found that the cooling rate of the example was 2.7 times that of the conventional example. Further, it was found that the coke cooling time required to reach 300 ° C., which is the furnace temperature of the coke oven that can be dismantled, can be shortened to about 1/3 that of the conventional example.

  1 to 5 used in the above-described embodiments are schematic views, and the size of each component shown in FIGS. 1 to 5 is different from the actual one. The explanation has been changed to make it easier to understand.

DESCRIPTION OF SYMBOLS 1 Coke oven 2 Coking chamber 2a Furnace wall 2b Ceiling part 3 Combustion chamber 4 Furnace lid 5 Heat storage chamber 6 Fuel gas 7 Combustion exhaust gas 12 Partition wall 13 Air 21 Perforated part 22 Damaged part 31 Furnace 32 Charging hole 33 Filling fire resistance Material 41 Filling outflow prevention wall 51 Brick 52, 53, 55 Open 54 Brick block 56 Checker brick

Claims (4)

  When cooling the coke oven, the furnace lids are removed from both ends of the carbonization chamber where there is a possibility of collapse, and there are provided gas spill prevention walls with air permeability and heat resistance at both ends of the carbonization chamber. A cooling method for a coke oven, which is filled with a filled refractory and cools the entire coke oven.   The filling of the filled refractory is carried out after re-attaching the furnace lid to the filling outflow prevention walls at both ends of the carbonization chamber, and the furnace lid is again removed from both ends of the carbonization chamber after filling with the filled refractory, The method for cooling a coke oven according to claim 1, wherein the whole is cooled.   The method for cooling a coke oven according to claim 1 or 2, wherein the filling outflow prevention wall is a brick wall assembled in a lattice shape.   The method for cooling a coke oven according to any one of claims 1 to 3, wherein the filled refractory is a block brick.

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