JP2005154597A - Method for hot repair of coke oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for hot repair of a coke oven by which the blocking of a port in a combustion chamber can be sufficiently prevented while reducing the cost for the repair. <P>SOLUTION: This method for the hot repair of the coke oven, carrying out the reload of a brick material comprises installing an inflammable plate-shaped member burning at a temperature not lower than 400°C and not higher than 800°C so as to cover hole parts in the upper part of a port part of a piping part in a combustion chamber, where the port part is constituted as a laminate of the bricks having the hole parts, and burning down the plate-shaped member when raising the temperature of the port part after finishing the reload of the brick material. Preferably, the plate-shaped member is a laminate of a ceramic sheet and Bakelite (R). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot repair method in which a brick wall that separates a carbonization chamber and a combustion chamber, bricks in the combustion chamber, and the like are transposed in a coke oven for producing coke for use in iron making or the like.

  As shown in FIG. 2, a coke oven for producing coke used for iron making has a structure in which a coking chamber 11 for coking coal and a combustion chamber 12 for supplying heat to the coking chamber are alternately arranged. Then, heat is supplied from the combustion chamber 12 to the carbonization chamber 11 by heat conduction from a brick wall (hereinafter referred to as a side wall) that separates the carbonization chamber 11 and the combustion chamber 12. The normal-temperature coal charged into the carbonization chamber 11 is heated and dry-distilled into coke, and is extruded and carried out from one end of the carbonization chamber 11. In this way, the side walls of the coke oven are exposed to intense temperature cycles and repeatedly subjected to friction during the loading and unloading of coal and coke, so in many cases the volume change at high temperatures is relatively small and thermal conductivity is good and mechanical strength is high. Constructed using large quartz brick. The carbonization chamber 11 and the combustion chamber 12 have a heat storage chamber 13 at the bottom and a ceiling brick 14 at the top.

  Coke ovens made up of brick walls as described above usually start operation once they reach a high temperature state and then cool to room temperature. It is kept at a high temperature exceeding 1000 ° C. However, since the side walls are exposed to the harsh usage environment as described above, cracks, corner chipping, etc. occur and it is necessary to repair them appropriately, and after insulating them by inserting a heat insulation box into the carbonization chamber, etc. Hot repairs are performed in which people enter the furnace and perform partial transshipment of bricks in a high temperature state. Silica brick has a property that the coefficient of thermal expansion changes greatly depending on the temperature and expands and contracts suddenly around 270 ° C and 560 ° C. Therefore, when repairing the furnace wall, the inside of the furnace to be repaired In order to prevent the brick from collapsing, it is preferable that the hot repair is performed at a temperature of about 600 ° C. or higher (see, for example, Patent Document 1).

When the bricks in the combustion chamber are reloaded hot as described above, since the reloading operation is performed from the carbonization chamber side, the combustion chamber is closed simultaneously with completion of the side wall stacking. Therefore, the gas port part composed of perforated bricks corresponding to the gas piping in the combustion chamber must be kept as it is when it can be reused, and it must be stacked before the side wall or almost simultaneously with the side wall when reloading. There is.
JP-A-6-41540 (Page 2, [Prior Art])

  However, the gas port portion in the combustion chamber has a risk of clogging due to the fall of brick scraps generated when bricks are dismantled, and a risk of clogging due to mortar when bricks are replaced. In order to prevent the occurrence of such blocking of the port portion, for example, a lid can be installed on the upper portion of the port portion. However, since the gas cannot be introduced into the combustion chamber with the lid on, it is necessary to remove the lid from the narrow gap at the top of the side wall before completely replacing the side wall while the lid can be removed manually. Some ports have an upper part near the bottom of the furnace, and removing the lid is time consuming and labor intensive. In addition, since the side wall stacking is completed after the lid is removed, it is impossible to prevent debris and the like generated in the subsequent work from dropping on the port portion.

  Therefore, an object of the present invention is to solve such problems of the prior art, and in the hot repair of the coke oven, the coke can be sufficiently prevented from being blocked while reducing the repair cost. It is to provide a hot repair method for a furnace.

The features of the present invention for solving such problems are as follows.
(1) In hot repair of a coke oven that reloads brick materials, at the upper part of the port portion, which is a piping portion in the combustion chamber and is configured as a brick laminate having holes, is 400 ° C. or higher and 800 ° C. A coke, characterized in that a combustible plate-like member that burns below is installed so as to cover the hole portion, and the plate-like member is burned off when the port portion is heated after completion of brick material transshipment. Hot repair method for the furnace.
(2) The hot repair method for a coke oven according to (1), wherein the plate-like member is a laminate of a ceramic sheet and bakelite.

  ADVANTAGE OF THE INVENTION According to this invention, in hot repair of a coke oven, it can prevent that brick waste etc. fall and obstruct | occlude in each port of a combustion chamber at the time of the temperature increase after brick replacement work or completion | finish of reloading. In addition, the work for preventing port blockage can be simplified and blockage can be prevented at low cost.

  FIG. 1 is a schematic view of a horizontal section of a piping section in a combustion chamber of a coke oven. The port part 1, which is a piping part in the combustion chamber and configured as a laminate of bricks having holes, differs in type depending on the upper position of the port part which is a gas discharge part, and the upper part of the port is in descending order. The high port 2, the C gas port 3, and the low port 4 are called different names. When repairing bricks in these ports, combustible plates that burn at 400 ° C or more and 800 ° C or less at the top of the port part at any time after the brick transshipment work is completed (usually the transshipment of the low port ends first) The shaped member is installed so as to cover the hole portion 5 (gas passage portion) of the brick. After the plate-like members that burn at 400 ° C. or more and 800 ° C. or less are installed above all the ports so as to cover the hole of the brick, the transshipment of the side walls, which are the brick walls separating the carbonization chamber and the combustion chamber, is completed. If large brick fragments or the like are observed in the combustion chamber before completely closing the combustion chamber, it is desirable to remove them. Further, when large brick fragments or the like are observed on the plate-like member, they are removed immediately.

  Although the temperature of the combustion chamber after the repair is gradually raised, combustion using each port is started when the chamber temperature reaches from 500 ° C to 700 ° C. Therefore, the port needs to be open above this temperature. In the present invention, a plate-like member that burns at 400 ° C. or more and 800 ° C. or less is installed at the upper part of the port so as to cover the hole of the brick. , And the plate-like member burns and burns out when the port is used, so that the port is opened.

As the plate member, it is desirable to use a laminate of a ceramic sheet and bakelite. Since the plate-like member has fallen objects at room temperature, it needs to have a certain degree of strength in addition to burning at 400 ° C. or higher and 800 ° C. or lower. Bakelite is desirable in terms of strength at room temperature, but softens and warps at about 300 ° C. or more, and burns out at about 500 ° C. Since a part of the port may be heated to about 300 ° C. during the transshipment operation, it is difficult to maintain sufficient strength during the brick transshipment operation with a plate member made of bakelite alone. On the other hand, the ceramic sheet formed by adding a binder to the ceramic powder burns away at 500 to 600 ° C., but its strength is low. By superimposing the bakelite and the ceramic sheet, even when the bakelite is softened, the ceramic sheet can support this, so that the shape can be maintained. As a component of the ceramic sheet, SiO ₂ , Al ₂ O _{3 and the} like are suitable. As a laminated body, a ceramic sheet and a bakelite plate can be adhered and used, but they can be used only by being laminated. Further, the ceramic sheet and the bakelite plate can be laminated in a sandwich shape, or a plurality of sheets can be laminated one by one.

  The thickness of the plate member is preferably about 1 mm to 10 mm, for example, in the case of a laminate of ceramic sheets and bakelite.

  The plate-like member is preferably fixed to the port with an easily combustible adhesive such as a gum tape.

  The present invention can be applied to all ports in the combustion chamber, but when used for a port having a low upper position of the port portion such as a low port, the effect of reducing the repair cost is remarkable.

It is the schematic of the horizontal cross section of the piping part in the combustion chamber of a coke oven. It is the schematic which shows the structure of a coke oven.

Explanation of symbols

1 Port 2 High Port 3 C Gas Port 4 Low Port 5 Hole 11 Carbonization Chamber 12 Combustion Chamber 13 Heat Storage Chamber 14 Ceiling Brick

Claims (2)

  In hot repair of a coke oven that reloads brick material, it burns at 400 ° C. or more and 800 ° C. or less at the upper part of the port part, which is a pipe part in the combustion chamber and is configured as a brick laminate having holes. A combustible plate-like member is installed so as to cover the hole portion, and the plate-like member is burned off at the time of temperature rise of the port portion after completion of brick material transshipment. Repair method.   The hot repair method for a coke oven according to claim 1, wherein the plate member is a laminate of a ceramic sheet and a bakelite.

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