Method for repairing coke oven

Abstract

To provide a method for repairing a coke oven that enables confirmation of blockage of gas holes during repair work of the coke oven without requiring significant labor and time.SOLUTION: A method for repairing a coke oven according to the present invention includes a confirmation step of confirming whether or not gas holes are blocked by dismantled oven wall bricks before reloading oven wall bricks. The confirmation step includes a step of inserting a pipe having an opening on an outer peripheral part on one end side into a vertical hole from the one end side, introducing light into the pipe from the other end side of the pipe, and visually confirming light leaking from the opening from an inlet side of a horizontal hole to confirm whether or not the horizontal hole is blocked by the dismantled oven wall bricks, and / or a step of sealing an outlet of a vertical hole other than a vertical hole to be confirmed, installing an airflow meter at the outlet of the vertical hole to be confirmed, supplying air from the inlet of the horizontal hole, and measuring an airflow at the outlet of the vertical hole to be confirmed with the airflow meter to confirm whether or not the vertical hole is blocked by the dismantled oven wall bricks.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for repairing a coke oven, comprising dismantling and replacing oven wall bricks that form the combustion chamber of the coke oven. [Background technology]

[0002] In coke ovens, the repeated carbonization of coal and discharge of coke causes wear to the oven wall bricks that form the carbonization chamber and combustion chamber of the coke oven. For this reason, repair work is periodically carried out to dismantle and replace the oven wall bricks. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-87288 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional coke oven repair work, the process of replacing the oven wall bricks was started without checking whether the dismantled oven wall bricks were blocking the gas holes that supply the combustion air and fuel gas in the regenerator to the combustion chamber. If it is found that the oven wall bricks are blocking the gas holes after replacing the oven wall bricks, the combustion air and fuel gas in the regenerator cannot be supplied to the combustion chamber, and the coke oven cannot operate, so the cost of replacing the oven wall bricks is wasted. For this reason, there was a need to provide a method for checking the blockage of the gas holes during coke oven repair work.

[0005] Patent Document 1 proposes a method for preventing dismantled furnace wall bricks from blocking the gas holes by filling the gas holes with refractory material of a size that will not enter the gas holes before dismantling the furnace wall bricks. However, the method described in Patent Document 1 requires the refractory material to be charged from the top of the combustion chamber, which has a length of several tens of meters, and the refractory material must be removed by suction after dismantling, which requires a lot of labor and time.

[0006] The present invention has been made to solve the above-mentioned problems, and its object is to provide a coke oven repair method that makes it possible to check for blockage of gas holes during coke oven repair work without requiring a lot of effort and time. [Means for solving the problem]

[0007] The method for repairing a coke oven according to the present invention is a method for repairing a coke oven, which comprises dismantling and replacing oven wall bricks forming a combustion chamber in a coke oven having a horizontal hole extending in a horizontal direction and a plurality of vertical holes extending upward from the horizontal hole, and which is provided with gas holes for supplying combustion air and combustion gas preheated in a heat regenerator chamber to a fuel chamber via the horizontal hole and the plurality of vertical holes, and includes a confirmation step of confirming whether or not the gas holes are blocked by the dismantled oven wall bricks before replacing the oven wall bricks, and the confirmation step includes a step of connecting a pipe having an opening on an outer periphery on one end side to a gas hole formed in the furnace wall. and / or a step of checking whether or not the vertical hole is blocked by a dismantled furnace wall brick by inserting a light source into the vertical hole from one end side of the piping, introducing light into the piping from the other end side of the piping, and visually checking the light leaking from the opening from the inlet side of the horizontal hole, and / or a step of checking whether or not the vertical hole is blocked by a dismantled furnace wall brick by blocking the outlets of vertical holes other than the vertical hole to be checked, installing an air flow meter at the outlet of the vertical hole to be checked, sending air through the inlet of the horizontal hole, and measuring the air flow at the outlet of the vertical hole to be checked with the air flow meter. Effect of the Invention

[0008] According to the method for repairing a coke oven of the present invention, blockage of a gas hole can be confirmed during repair work of a coke oven without requiring much labor and time. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a coke oven to which a method of repairing a coke oven according to an embodiment of the present invention is applied. [Diagram 2] FIG. 2 is a diagram for explaining a method for checking for blockage of a horizontal hole between a vertical hole at a specific location of a gas hole and a light checking position. [Diagram 3] FIG. 3 is a diagram for explaining a method for checking for blockage of a vertical hole at a specific location of the gas hole and a horizontal hole between the vertical hole at the specific location and the wind inlet. [Figure 4] FIG. 4 is a diagram illustrating the problems associated with the method of checking for blockage using light and the method of blowing air. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a method for repairing a coke oven according to one embodiment of the present invention will be described with reference to the drawings.

[0011] [Configuration of a coke oven] First, with reference to FIG. 1, a configuration of a coke oven to which a method of repairing a coke oven according to an embodiment of the present invention is applied will be described.

[0012] Fig. 1 is a schematic diagram showing the configuration of a coke oven to which a method for repairing a coke oven according to one embodiment of the present invention is applied. As shown in Fig. 1, a coke oven 1 to which a method for repairing a coke oven according to one embodiment of the present invention is applied is provided with an upper structure in which carbonization chambers and combustion chambers 2 (not shown) are alternately arranged in the oven width direction, and a lower structure in which a heat regenerator 3 is arranged to supply combustion air and fuel gas to the combustion chamber 2. In this coke oven 1, the combustion air and fuel gas in the heat regenerator 3 are preheated by utilizing the waste heat of the gas combusted in the combustion chamber 2, and the preheated combustion air and fuel gas are supplied to the combustion chamber 2 through a gas hole 4.

[0013] In this coke oven 1, the gas hole 4 is composed of a horizontal hole 4a extending horizontally and a plurality of vertical holes 4b extending upward from the horizontal hole 4a, and preheated combustion air and fuel gas are supplied into the combustion chamber 2 through the horizontal hole 4a and the vertical hole 4b in order. Then, by burning the fuel gas in the combustion chamber 2, the inside of the carbonization chamber (not shown) is heated through the oven wall bricks. As a result, the coal in the carbonization chamber (not shown) is carbonized to become coke. When the coke is produced, the furnace lids installed at the furnace openings at both ends of the carbonization chamber (not shown) in the furnace length direction are opened, and the produced coke is discharged by pushing the coke to the other furnace opening using an extruder installed on one of the furnace openings of the carbonization chamber (not shown).

[0014] In a coke oven 1 having such a configuration, by carrying out the coke oven repair method described below, the oven wall bricks forming the combustion chamber 2 can be dismantled and replaced while checking the blockage of the gas holes 4 (horizontal holes 4a and vertical holes 4b) without requiring much labor and time. Hereinafter, the flow of the coke oven repair method according to one embodiment of the present invention will be described with reference to Figs. 2 and 3.

[0015] [How to repair a coke oven] FIG. 2 is a diagram for explaining a method for checking the blockage of the horizontal hole 4a between the vertical hole 4b at a specific location of the gas hole 4 and the light confirmation position. FIG. 3 is a diagram for explaining a method for checking the blockage of the vertical hole 4b at a specific location of the gas hole 4 and the horizontal hole 4a between the vertical hole 4b at the specific location and the wind inlet. In a method for repairing a coke oven according to an embodiment of the present invention, first, the oven wall bricks forming the combustion chamber 2 are dismantled, and the dismantled oven wall bricks are removed. Next, a cylindrical pipe 10 having a length equivalent to the length of the vertical hole 4b and an opening on the outer periphery on one end side is prepared. The material of the inner wall of the pipe 10 is preferably a material that easily reflects light. Next, as shown in FIG. 2, the pipe 10 is passed through any vertical hole 4b until the position of the opening reaches the position of the horizontal hole 4a, and light L is introduced into the pipe 10 from the other end of the pipe 10 using a flashlight 11. As a result, the light L irradiated from the flashlight 11 leaks into the horizontal hole 4a through the opening.

[0016] Next, the light L is confirmed from the entrance side of the horizontal hole 4a, and if the light L is confirmed, it is determined that the horizontal hole 4a between the position of the vertical hole 4b into which the flashlight 11 is inserted and the entrance is not blocked. On the other hand, if the light L is not confirmed, it is determined that the horizontal hole 4a is blocked somewhere between the entrance of the horizontal hole 4a and the position of any vertical hole 4b. The light L can be confirmed by visual confirmation, but a light meter can also be used. Next, as shown in FIG. 3, the upper exits of the vertical holes 4b other than the vertical hole 4b to be confirmed are blocked, and an airflow meter 12 is installed at the upper exit of the vertical hole 4b to be confirmed. Next, wind is sent in from the entrance of the horizontal hole 4a, and the airflow measured by the airflow meter 12 is compared with the airflow data during normal times to determine whether the vertical hole 4b to be confirmed and the horizontal hole 4a between the vertical hole 4b to be confirmed and the wind inlet are blocked. For example, if the measured air volume is less than the normal air volume, it is determined that the vertical hole 4b to be checked and / or the horizontal hole 4a between the vertical hole 4b to be checked and the air inlet are blocked. Blockage of all the vertical holes 4b is checked in the same manner. Then, after it is confirmed that the gas hole 4 is not blocked by the dismantled furnace wall bricks, the furnace wall bricks are replaced.

[0017] The method of checking for blockage using light L is primarily a method for checking for blockage of the horizontal holes 4a, but since cylindrical pipes 10 are inserted into any vertical holes 4b, it is clear that a gas passage is secured within the diameter of the pipes 10. Blockage of the horizontal holes 4a and vertical holes 4b can also be checked simply by blowing air into them. However, by appropriately combining these methods, blockage of the horizontal holes 4a and vertical holes 4b can be checked efficiently and accurately.

[0018] Specifically, in the method of checking for blockage with light L, if tar or other deposit A ​​is attached to the inner surface of the gas hole 4 as shown in FIG. 4(a), it may be difficult to visually determine blockage. In particular, if the length of the gas hole 4 is long, it may be difficult to visually determine blockage unless the amount of light is increased. On the other hand, in the method of blowing air, if a solid object B such as a brick fragment is clogged in the gas hole 4 as shown in FIG. 4(b), the air volume can be measured, but it is difficult to determine that the solid object B is clogged in the gas hole 4. In this way, the symptoms change depending on the manner of blockage caused by the deposit A ​​or the solid object B. For this reason, it is preferable to use a combination of the method of checking for blockage with light L and the method of blowing air.

[0019] As is clear from the above description, the method for repairing a coke oven according to one embodiment of the present invention includes a step of confirming whether the gas hole 4 is blocked by a dismantled oven wall brick before replacing the oven wall brick. The confirmation step includes a step of inserting a pipe 10 having an opening on the outer periphery of one end side into the vertical hole 4b from one end side, introducing light into the pipe 10 from the other end side of the pipe 10, and visually checking the light L leaking from the opening from the inlet side of the horizontal hole 4a to confirm whether the horizontal hole 4a is blocked by a dismantled oven wall brick, and / or a step of closing the outlets of the vertical holes 4b other than the vertical hole 4b to be confirmed, installing an air flow meter 12 at the outlet of the vertical hole 4b to be confirmed, blowing air from the inlet of the horizontal hole 4a, and measuring the air flow rate at the outlet of the vertical hole 4b to be confirmed by the air flow meter 12. This makes it possible to confirm whether the gas hole 4 is blocked during repair work of the coke oven 1 without much effort and time.

[0020] Although the embodiments of the present invention have been described above, the present invention is not limited by the descriptions and drawings that form part of the disclosure of the present invention according to the present embodiments. In other words, other embodiments, examples, and operation techniques, etc., made by those skilled in the art based on the present embodiments are all included in the scope of the present invention. [Explanation of symbols]

[0021] 1. Coke oven 2. Combustion chamber 3 Heat storage chamber 4 Gas Vent 4a horizontal hole 4b Vertical hole 10 Piping 11. Flashlight 12 Air flow meter A. Adhesion B Solid object

Claims

[Claim 1] A method for repairing a coke oven, the method comprising dismantling and replacing oven wall bricks forming a combustion chamber of the coke oven, the oven having a horizontal hole extending in a horizontal direction and a plurality of vertical holes extending upward from the horizontal hole, and a gas hole for supplying combustion air and combustion gas preheated in a heat regenerator chamber to a fuel chamber via the horizontal hole and the plurality of vertical holes, the method comprising the steps of: a confirmation step of confirming whether or not the gas hole is blocked by a dismantled furnace wall brick before the furnace wall brick is replaced; The confirmation step includes a step of inserting a pipe having an opening on the outer periphery of one end side into the vertical hole from one end side, introducing light into the pipe from the other end side, and visually checking the light leaking from the opening from the inlet side of the horizontal hole to confirm whether or not the horizontal hole is blocked by the dismantled furnace wall bricks, and / or a step of sealing the outlets of vertical holes other than the vertical hole to be confirmed, installing an air flow meter at the outlet of the vertical hole to be confirmed, sending air from the inlet of the horizontal hole, and measuring the air flow at the outlet of the vertical hole to be confirmed by the air flow meter to confirm whether or not the vertical hole is blocked by the dismantled furnace wall bricks. How to repair a coke oven.

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