7.63 m coke oven regenerator checker brick row-by-row replacement method

Abstract

The present application relates to the technical field of coke oven hot maintenance, and discloses a 7.63m coke oven regenerator checker brick through-row replacement method, which comprises the following steps: A) adjusting the heating system of the regenerator whose checker bricks need to be replaced in advance, so as to ensure that the regenerator has sufficient heat source to maintain the temperature during the replacement of the checker bricks; B) removing the old checker bricks; and C) reinstalling the new checker bricks. The 7.63m coke oven regenerator checker brick through-row replacement method successfully completes the replacement of the checker bricks of the regenerator of the 7.63m coke oven in combination with the improvement of the repair mode of the oven wall after the perfecting and recovery of the oven wall insulation.

Description

Technical Field

[0001] This invention relates to the field of hot maintenance technology for coke ovens, specifically to a method for replacing checker bricks in a 7.63m coke oven regenerator using a through-row method. Background Technology

[0002] Coke oven checker bricks are perforated refractory bricks used for heat exchange in the coke oven regenerator. They recover the waste heat from the exhaust gas emitted from the coke oven combustion chamber by alternating heat absorption and release, and use it as a preheating agent for coke oven fuel combustion. This can improve coke oven combustion efficiency and reduce energy consumption.

[0003] During production, as the coke oven's service life increases, the checker bricks in the regenerator chamber may deform or melt due to high temperatures and erosion from impurities in the gas. This increases airflow resistance within the regenerator chamber, affecting the normal heating of the coke oven. When conventional cleaning and unblocking methods are ineffective, the checker bricks in the regenerator chamber need to be replaced.

[0004] However, the regenerator is a high-temperature zone, with the top temperature reaching over 1000℃. Furthermore, the furnace walls of the regenerator are made of silica bricks, which will suffer irreversible damage when their temperature drops below the crystal transformation point of 573℃. Therefore, in the past, some checker bricks could only be replaced without entering the regenerator.

[0005] The key to replacing the checker bricks inside the regenerator lies in resolving the conflict between the controlled temperature of the regenerator walls and the temperature of the space accessible to workers. On one hand, the regenerator wall temperature cannot fall below the crystalline transformation point of the silica bricks (573℃); on the other hand, the maximum temperature a person can tolerate in the space cannot exceed 120℃. While the working space temperature can be achieved through excellent insulation materials, maintaining the furnace walls is challenging. The regenerator is 550mm wide, allowing only one person to enter at a time. Each regenerator contains 6912 checker bricks, weighing over 40 tons, and the entire operation takes approximately 70 hours, resulting in significant heat loss within the regenerator. Simultaneously, the combustion chamber corresponding to the regenerator remains unheated throughout the operation, necessitating the search for a heat source to maintain the regenerator's temperature. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing a method for replacing the checker bricks in the regenerator chamber of a 7.63m coke oven through a continuous drainage system. This method, combined with improvements to the furnace wall insulation and the furnace wall repair method after restoration, successfully completed the replacement of the checker bricks in the regenerator chamber of the entire 7.63m coke oven.

[0007] To achieve the above objectives, the present invention provides a method for replacing the checker bricks in a 7.63m coke oven regenerator using a through-row system, comprising the following steps:

[0008] A) Adjust the heating regime of the heat storage chamber that needs to replace the checker bricks in advance to ensure that the heat storage chamber has a sufficient heat source to maintain the temperature during the replacement of the checker bricks;

[0009] B) Remove the old checkered bricks;

[0010] C) Reinstallation of new checkerboard bricks.

[0011] Preferably, in step A), the heating regime adjustment includes: assuming the regenerator chamber whose checker bricks need to be replaced is designated as regenerator N, corresponding to the N carbonization chamber shutdown, adjusting the shutdown heating time of carbonization chamber shutdowns N-1, N, and N+1 to 60%, 75%, and 60% of the coking time, respectively. Here, reverse heat transfer from the carbonization chamber is used as the heat source. During normal production, the carbonization chamber is the heat-receiving body, and the coke inside the carbonization chamber can also serve as a heat source when heating stops. Through system analysis, the time when all the coal in the carbonization chamber begins semi-coke shrinkage is approximately at 60% of the coking time. Based on the heat dissipation calculation over three days, it is determined that the shutdown heating time of the three carbonization chamber shutdowns should be adjusted to 60%, 75%, and 60% of the coking time, respectively, ensuring sufficient heat sources in the combustion chamber and regenerator chamber during operation.

[0012] Preferably, in step A), the heating regime adjustment includes: assuming the heat storage chamber whose checker bricks need to be replaced is heat storage chamber N, before stopping heating, heat storage chambers N-1, N, and N+1 are heated, the gas regulating valve is closed and the air damper is closed when the airflow rises, and the temperature of the heat storage chamber is increased in advance for 2 to 3 exchange times, thereby expanding the temperature drop curve of the heat storage chamber.

[0013] Preferably, in step A), the heating regime adjustment includes: assuming the heat storage chamber whose checker bricks need to be replaced is heat storage chamber N, during the operation, all the dampers of heat storage chambers N-1 and N+1 are closed, and the small flap of the exhaust gas switch is slightly opened by 1 / 3 to achieve exhaust gas circulation, ensure heat transfer, achieve controllable temperature maintenance, and transfer heat to heat storage chamber N to control temperature drop.

[0014] Preferably, step B) includes the following steps:

[0015] B1) Cover the switching device with an iron plate to prevent broken bricks from clogging the switching equipment and affecting the switching process;

[0016] B2) On the coke oven machine and coke side operating platform, remove the coke spillway plate. The height of the removal of the sealing wall should be as consistent as possible with the height of the checker bricks to be removed, so as to reduce the impact of cold air intrusion on the remaining checker bricks. Make a baffle to block the cold air from entering the heat storage chamber during construction breaks.

[0017] B3) Remove the checker bricks using special tools: The special tools include hooks, flat chisels, and chute. The chute is a U-shaped chute with three sealed sides made of 3mm thick steel plate. Install the chute on top of the next layer of checker bricks to be removed to prevent debris from falling onto the next layer of checker bricks. Use the hook to move the removed checker bricks out along the chute. The chute is pushed inward as the upper layer of checker bricks are removed. If there are any molten checker bricks during the removal process, use the flat chisel to break them up and move them out along the chute. The order of removing the checker bricks is "from top to bottom, from outside to inside". When removing them, support the inner partition wall to prevent the inner checker bricks from collapsing.

[0018] B4) Cover the top of the removed checker bricks with an insulation board to prevent debris from falling onto the next layer of checker bricks. As the upper layer of checker bricks is removed, gradually push in the insulation board. The insulation board is a combination of 1mm galvanized sheet, 50mm ceramic fiber blanket and 3mm iron plate. During installation, the galvanized sheet side should be placed at the bottom and in contact with the checker bricks.

[0019] B5) After all the partition bricks have been removed, the bottom is covered with insulation board, and ceramic fiber blankets are laid on the corresponding sides and top walls as insulation measures for the work area and furnace walls.

[0020] Preferably, step C) includes the following steps:

[0021] C1) Before installing new checker bricks, check the dimensions of the new checker bricks, determine the quality of the replacement checker bricks, and distinguish the material and brick number of the checker bricks.

[0022] C2) Install each grid brick from bottom to top, and build the partition wall after each grid is installed;

[0023] C3) After the grid is installed, the construction of the coke oven regenerator sealing wall begins. The coke oven regenerator sealing wall is constructed according to the original design requirements. After the coke oven regenerator sealing wall is completed, insulation material is applied to the wall surface, and the online replacement of the coke oven regenerator grid bricks is completed.

[0024] Compared with the prior art, the present invention has the following advantages: replacing the checker bricks as a whole can completely eliminate the hidden dangers of the checker bricks in the regenerator, maintain the temperature of the regenerator brick wall during the replacement, and, through the improvement of the furnace wall insulation and the furnace wall repair method after restoration, successfully completed the replacement of the checker bricks in the regenerator of the entire 7.63m coke oven. Attached Figure Description

[0025] Figure 1 This is a state diagram of the corresponding heat storage chamber in this invention. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] A method for replacing checker bricks in a 7.63m coke oven regenerator using a through-row system includes the following steps:

[0028] A) Adjust the heating regime of the heat storage chamber that needs to replace the checker bricks in advance to ensure that the heat storage chamber has a sufficient heat source to maintain the temperature during the replacement of the checker bricks;

[0029] B) Remove the old checkered bricks;

[0030] C) Reinstallation of new checkerboard bricks.

[0031] In step A), the heating regime adjustment includes: such as Figure 1 As shown, let the number of the regenerator that needs to have its checker bricks replaced be regenerator N, which corresponds to the N carbonization chamber stoking. Adjust the stopping heating time of the N-1 carbonization chamber stoking, N carbonization chamber stoking, and N+1 carbonization chamber stoking to 60%, 75%, and 60% of the coking time, respectively.

[0032] Alternatively, in step A), the heating regime adjustment includes: such as Figure 1 As shown, the number of the heat storage chamber that needs to have its checker bricks replaced is heat storage chamber N. Before stopping heating, heat storage chambers N-1, N, and N+1 are heated. When the airflow is rising, the gas regulating valve is closed and the air damper is closed, and the exchange time is maintained for 2 to 3 times.

[0033] In other embodiments, step A) may include adjusting the heating regime as follows: Figure 1 As shown, the number of the heat storage chamber that needs to have its checker bricks replaced is heat storage chamber N. During the operation, the dampers of heat storage chambers N-1 and N+1 are all closed, and the small flap of the exhaust gas switch is slightly opened by 1 / 3.

[0034] In addition, in this embodiment, step B) includes the following steps:

[0035] B1) Cover the switching device with an iron plate to prevent broken bricks from clogging the switching equipment and affecting the switching process;

[0036] B2) On the coke oven machine and coke side operating platform, remove the coke spillway plate. The height of the removal of the sealing wall should be as consistent as possible with the height of the checker bricks to be removed, so as to reduce the impact of cold air intrusion on the remaining checker bricks. Make a baffle to block the cold air from entering the heat storage chamber during construction breaks.

[0037] B3) Remove the checker bricks using special tools: The special tools include hooks, flat chisels, and chute. The chute is a U-shaped chute with three sealed sides made of 3mm thick steel plate. Install the chute on top of the next layer of checker bricks to be removed to prevent debris from falling onto the next layer of checker bricks. Use the hook to move the removed checker bricks out along the chute. The chute is pushed inward as the upper layer of checker bricks are removed. If there are any molten checker bricks during the removal process, use the flat chisel to break them up and move them out along the chute. The order of removing the checker bricks is "from top to bottom, from outside to inside". When removing them, support the inner partition wall to prevent the inner checker bricks from collapsing.

[0038] B4) Cover the top of the removed checker bricks with an insulation board to prevent debris from falling onto the next layer of checker bricks. As the upper layer of checker bricks is removed, gradually push in the insulation board. The insulation board is a combination of 1mm galvanized sheet, 50mm ceramic fiber blanket and 3mm iron plate. During installation, the galvanized sheet side should be placed at the bottom and in contact with the checker bricks.

[0039] B5) After all the partition bricks have been removed, the bottom is covered with insulation board, and ceramic fiber blankets are laid on the corresponding sides and top walls as insulation measures for the work area and furnace walls.

[0040] In this embodiment, step C) includes the following steps:

[0041] C1) Before installing new checker bricks, check the dimensions of the new checker bricks, determine the quality of the replacement checker bricks, and distinguish the material and brick number of the checker bricks.

[0042] C2) Install each grid brick from bottom to top, and build the partition wall after each grid is installed;

[0043] C3) After the grid is installed, the construction of the coke oven regenerator sealing wall begins. The coke oven regenerator sealing wall is constructed according to the original design requirements. After the coke oven regenerator sealing wall is completed, insulation material is applied to the wall surface, and the online replacement of the coke oven regenerator grid bricks is completed.

Claims

1. A method for replacing checker bricks in a 7.63m coke oven regenerator using a through-row method, characterized in that: Includes the following steps: A) Adjust the heating regime of the regenerator that needs to replace the checker bricks in advance to ensure that the regenerator has sufficient heat source to maintain the temperature during the replacement of the checker bricks. The heating regime adjustment includes: let the sequence number of the regenerator that needs to replace the checker bricks be regenerator N, corresponding to the N carbonization chamber quenching. Adjust the heating stop time of the N-1 carbonization chamber quenching, N carbonization chamber quenching, and N+1 carbonization chamber quenching to 60%, 75%, and 60% of the coking time, respectively. Before stopping the heating, heat up the N-1, N, and N+1 regenerators. When the airflow rises, close the gas regulating valve and the air damper, and maintain for 2 to 3 exchange times. During the operation, close all the dampers of the N-1 and N+1 regenerators and slightly open the small flap of the exhaust gas switch by 1 / 3. B) Remove the old checkered bricks; C) Reinstallation of new checkerboard bricks.

2. The method for replacing the checker bricks in the 7.63m coke oven regenerator as described in claim 1, characterized in that: Step B) includes the following steps: B1) Cover the switching device with an iron plate to prevent broken bricks from clogging the switching equipment and affecting the switching process; B2) On the coke oven machine and coke side operating platform, remove the coke spillway plate. The height of the removal of the sealing wall should be as consistent as possible with the height of the checker bricks to be removed, so as to reduce the impact of cold air intrusion on the remaining checker bricks. Make a baffle to block the cold air from entering the heat storage chamber during construction breaks. B3) Remove the checker bricks using special tools: The special tools include hooks, flat chisels, and chute. The chute is a U-shaped chute made of 3mm thick steel plate with three sealed sides. Install the chute on top of the next layer of checker bricks to be removed to prevent debris from falling onto the next layer of checker bricks. Use the hook to move the removed checker bricks out along the chute. The chute is pushed inward as the upper layer of checker bricks are removed. If there are any molten checker bricks during the removal process, use the flat chisel to break them up and move them out along the chute. The order of removing the checker bricks is "from top to bottom, from outside to inside". When removing them, support the inner partition wall to prevent the inner checker bricks from collapsing. B4) Cover the top of the removed checker bricks with an insulation board to prevent debris from falling onto the next layer of checker bricks. As the upper layer of checker bricks is removed, gradually push in the insulation board. The insulation board is a combination of 1mm galvanized sheet, 50mm ceramic fiber blanket and 3mm iron plate. During installation, the galvanized sheet side should be placed at the bottom and in contact with the checker bricks. B5) After all the partition bricks have been removed, the bottom is covered with insulation board, and ceramic fiber blankets are laid on the corresponding sides and top walls as insulation measures for the work area and furnace walls.

3. The method for replacing the checker bricks in the 7.63m coke oven regenerator as described in claim 1, characterized in that: Step C) includes the following steps: C1) Before installing new checker bricks, check the dimensions of the new checker bricks, determine the quality of the replacement checker bricks, and distinguish the material and brick number of the checker bricks; C2) Install each grid brick from bottom to top, and build the partition wall after each grid is installed; C3) After the grid is installed, the construction of the coke oven regenerator sealing wall begins. The coke oven regenerator sealing wall is constructed according to the original design requirements. After the coke oven regenerator sealing wall is completed, insulation material is applied to the wall surface, and the online replacement of the coke oven regenerator grid bricks is completed.

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