Regenerative chamber area maintenance method for coke oven

Abstract

The invention relates to a coke oven regenerative chamber area maintenance method which comprises the following steps: S1, dismounting sealing walls on the top surface and the side wall surface of a regenerative chamber, and replacing checker bricks in the regenerative chamber; s2, after the sealing wall is dismantled and the checker bricks are replaced, grate bricks in the heat storage chamber are replaced, and the hole diameter of the grate bricks is enlarged by 5-10 mm; s3, after the step S2 is completed, accumulated materials in the small flue are cleaned; s4, cracks of the single wall and the main wall of the regenerative chamber are sealed; s5, filling checker bricks in the regenerative chamber, and building a sealing wall of the regenerative chamber; s6, a top sealing wall of the regenerative chamber is dismantled and rebuilt, and accumulated materials in the chute are cleaned; and S7, heat preservation treatment is conducted on the outer surfaces of sealing walls of the top face and the side wall faces of the regenerative chamber. The invention has the beneficial effects of solving the heating condition of the vertical flue at the oven head of the coke oven, improving the circulation of gas and air at the regenerative chamber and increasing the temperature of the vertical flue at the oven head by more than 50 DEG C, so that the coke oven runs efficiently, the service life of the coke oven is prolonged, and the coke oven is energy-saving and environment-friendly.

Description

Technical Field

[0001] This invention relates to the technical field of coke oven repair methods, specifically a method for repairing the regenerator area of ​​a coke oven. Background Technology

[0002] The coke oven regenerator is located at the bottom of the coke oven and is a space where high-temperature exhaust gas preheats air or lean coal gas. The regenerator is arranged longitudinally, parallel to the long axis of the coke oven, and consists of small flues, grate bricks, and an upper space. The upper space is filled with grate bricks; the combustion exhaust gas heats the grate bricks, which preheat the air or lean coal gas to approximately 1000°C. This preheated gas is then fed into the corresponding vertical flues through two rows of inclined channels at the top. Simultaneously, the regenerator also serves as a circulation channel for the air or lean coal gas.

[0003] Due to expansion of the coke oven body or other factors, problems such as outward tilting of the regenerator wall, leakage, cracks in the main wall, melting of checker bricks, and blockages occur, severely affecting the normal heating function of the flues at the furnace head. This easily leads to immature coke at the furnace head, causing smoke during coke pushing and affecting coke quality. To avoid this situation, the coke oven maintains a high standard temperature, thereby increasing the temperature at the furnace head and wasting gas. The original regenerator maintenance method only involved removing the top of the regenerator, replacing the top checker bricks, cleaning the internal accumulated material, and unblocking the inclined flues at the furnace head, as well as simply sealing the regenerator wall. This method cannot effectively solve the heating problem of the vertical flues at the furnace head, which is crucial to the overall operation of the coke oven. It not only affects the quality of coke but also relates to energy consumption and environmental indicators in the coking process. Summary of the Invention

[0004] The purpose of this invention is to provide a maintenance method for the coke oven regenerator area that is easy to implement and operate, can solve the heating condition of the vertical flue in the coke oven head, improve the circulation of gas and air in the regenerator, and can increase the temperature of the vertical flue in the coke oven head by more than 50°C, so that the coke oven can operate efficiently, extend the service life of the coke oven, and is energy-saving and environmentally friendly.

[0005] This invention discloses a method for maintaining the regenerator area of ​​a coke oven, the method comprising the following steps: S1. Remove the sealing walls on the top and side walls of the heat storage chamber, and replace the checker bricks inside the heat storage chamber. The replacement quantity is determined based on the condition of the checker bricks, such as melting or blockage. S2. After the sealing wall is removed and the checker bricks are replaced, the grate bricks in the regenerator chamber are replaced, and the aperture of the grate bricks is enlarged by 5-10mm. This will further increase the air flow in the vertical flue of the furnace head, ensuring that more fuel is fully burned, thereby improving energy utilization efficiency, further improving the overall thermal efficiency of the coke oven, reducing harmful gas emissions, and helping to maintain the stability of the temperature inside the coke oven, reducing the impact of temperature fluctuations on the production process, reducing damage to the coke oven caused by thermal stress, and thus extending the service life of the equipment. S3. After completing S2, clean the accumulated material inside the small flue. Use cleaning tools to clean the accumulated material inside the small flue. The accumulated material mainly includes: sulfurous acid and sulfuric acid generated by SO2 and SO3 in the exhaust gas reacting with water; residues produced by coke oven gas leaking from the brick gas duct into the small flue and burning; eroded and detached fragments of the small flue lining; and material hanging on the flue flaps. This can ensure normal heating in the small flue of the coke oven, help maintain the efficient operation of the coke oven, reduce uneven heating or blockage caused by material accumulation, thereby improving the overall production efficiency of the coke oven. At the same time, it can reduce the corrosion and wear of the flue inner wall caused by the accumulated material and extend the service life of the coke oven. S4. After the small flue is cleaned, the cracks in the single wall and main wall of the heat storage chamber are sealed with asbestos rope, high-temperature adhesive and mud. Then, the surface of the single wall and main wall of the heat storage chamber is sealed with high-temperature adhesive until all the brick joints in the single wall and main wall of the heat storage chamber are sealed. S5. After the brick joints on the surface of the single wall and main wall of the heat storage chamber are sealed, the grid bricks inside the heat storage chamber are laid, and the heat storage chamber sealing wall is built. S6. After the sealing walls on the top and side walls of the regenerator are completed, the sealing walls on the top of the regenerator are removed and rebuilt, and the accumulated material inside the inclined channel is cleaned. Ensuring the cleanliness of the inclined channel can effectively clean the accumulated material and bricks at the inclined channel opening of the coke oven vertical flue, ensure the unobstructed flow of the inclined channel opening, and improve the working efficiency of the coke oven. S7. After the accumulated material inside the inclined chute has been cleaned, the outer surfaces of the sealing walls on the top and side walls of the regenerator are insulated. The insulation layer is made of asbestos wool, water, and 5% water glass, and is evenly applied to the outer surfaces of the sealing walls on the top and side walls of the regenerator. Asbestos wool, as an insulation material, has good thermal insulation properties and can effectively reduce heat loss, thereby improving the energy efficiency of the coke oven. The use of water glass can also improve the fire resistance and chemical stability of the insulation layer, enabling it to maintain good performance in high-temperature environments. The insulation layer made of asbestos wool, water, and 5% water glass combines the low thermal conductivity of asbestos with the bonding and reinforcing effects of water glass. This combination not only provides excellent thermal insulation but also ensures the structural stability and durability of the insulation layer. In addition, the use of this material can reduce heat loss from the outer walls of the coke oven, thereby reducing energy consumption and improving production efficiency.

[0006] In step S4, the cracks in the single wall and main wall of the heat storage chamber are sealed with asbestos rope, high-temperature adhesive, and mud. For cracks larger than 5mm, asbestos rope is first filled, followed by application of high-temperature adhesive and mud. For cracks smaller than 5mm, high-temperature adhesive and mud are applied. The surface of the single wall and main wall of the heat storage chamber is then sealed with high-temperature adhesive slurry. After the high-temperature adhesive slurry dries, any slurry not adhering to the cracks in the single wall and main wall of the heat storage chamber is cleaned off, and the slurry is applied again until all cracks are effectively sealed.

[0007] Cracks in the single wall and main wall of the thermal regenerator are sealed using asbestos rope, high-temperature adhesive, and mortar. The combination of asbestos rope and high-temperature adhesive provides excellent sealing performance. The asbestos rope itself has a certain degree of elasticity and high-temperature resistance, which can form a barrier at the crack to prevent the penetration of gas and liquid. The high-temperature adhesive can fix the asbestos rope at the crack and maintain its bonding strength in high-temperature environments, ensuring the durability of the sealing effect. The thermal regenerator will be exposed to high-temperature environments during operation, so the sealing material must be able to withstand high temperatures without losing its performance. Both asbestos rope and high-temperature adhesive have excellent high-temperature resistance and can remain stable at high temperatures without deforming or failing due to temperature increases. The sealing method using asbestos rope, high-temperature adhesive, and mortar is relatively simple, easy to construct, reduces the workload of operators, and effectively improves the thermal insulation performance of the single wall 4 and the main wall 1 of the thermal regenerator.

[0008] In step S5, after the brick joints are sealed, the heat storage chamber is filled with grid bricks from bottom to top, and the inner and outer sealing walls of the heat storage chamber are built. During the construction process, δ=20mm hard ceramic fiber board is added to the inner and outer sealing walls of the heat storage chamber.

[0009] Adding 20mm thick rigid ceramic fiber boards to the inner and outer walls of the heat storage chamber can significantly improve the thermal insulation and energy-saving performance of the chamber, while maintaining good fire resistance. This helps reduce heat transfer through the walls, improving insulation performance. The rigid ceramic fiber boards absorb less heat, thus increasing production efficiency. The bulk density of the rigid ceramic fiber boards is generally 280-330 kg / m³, about 1 / 3 that of lightweight bricks and 1 / 5 that of lightweight refractory castables. The smaller mass and heat capacity result in faster temperature rise, further enhancing energy-saving performance. It also has excellent fire resistance and is suitable for high-temperature environments.

[0010] Beneficial effects of this invention: 1) Adding δ=20mm hard ceramic fiber boards to the inner and outer walls of the heat storage chamber can significantly improve the thermal insulation performance and energy-saving effect of the heat storage chamber, while maintaining good fire resistance. This helps reduce heat transfer through the walls and improves thermal insulation performance. The ceramic fiber hard boards absorb less heat energy, thereby improving production efficiency. The bulk density of ceramic fiber hard boards is generally 280-330kg / m³, which is about 1 / 3 of that of lightweight bricks and 1 / 5 of that of lightweight refractory castables. The smaller mass and heat capacity allow for faster temperature rise, further enhancing the energy-saving effect. It also has excellent fire resistance and is suitable for high-temperature environments.

[0011] 2) Asbestos rope, high-temperature adhesive, and mortar are used to seal cracks in the single wall and main wall of the thermal storage chamber. The combination of asbestos rope and high-temperature adhesive provides excellent sealing performance. Asbestos rope itself has a certain degree of elasticity and high-temperature resistance, which can form a barrier at the crack to prevent the penetration of gas and liquid. The high-temperature adhesive can fix the asbestos rope at the crack and maintain its bonding strength in high-temperature environments, ensuring the durability of the sealing effect. The thermal storage chamber will experience a high-temperature environment during operation, so the sealing material must be able to withstand high temperatures without losing its performance. Both asbestos rope and high-temperature adhesive have excellent high-temperature resistance and can remain stable at high temperatures without deforming or failing due to temperature rise. The sealing method using asbestos rope, high-temperature adhesive, and mortar is relatively simple, easy to construct, reduces the workload of operators, and effectively improves the thermal insulation performance of the single wall and main wall of the thermal storage chamber.

[0012] 3) As a thermal insulation material, asbestos wool has good thermal insulation properties and can effectively reduce heat loss, thereby improving the energy efficiency of coke ovens. The use of water glass can also improve the fire resistance and chemical stability of the insulation layer, enabling it to maintain good performance in high-temperature environments. The insulation layer made of asbestos wool, water, and 5% water glass combines the low thermal conductivity of asbestos with the bonding and reinforcing effects of water glass. This combination not only provides excellent thermal insulation but also ensures the structural stability and durability of the insulation layer. In addition, the use of this material can reduce heat loss from the outer wall of the coke oven, thereby reducing energy consumption, improving production efficiency, and increasing the temperature of the fire channel at the furnace head by more than 50°C.

[0013] 4) Cleaning the accumulated material inside the small flue can ensure normal heating inside the coke oven's small flue, help maintain the coke oven's efficient operation, reduce uneven heating or blockage caused by accumulated material, thereby improving the overall production efficiency of the coke oven. At the same time, it can reduce the corrosion and wear of the flue's inner wall caused by accumulated material, and extend the coke oven's service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the coke oven regenerator of the present invention; In the diagram: 1. Main wall of the heat storage chamber; 2. Clay brick lining of the small flue; 3. Small flue; 4. Single wall of the heat storage chamber; 5. Grate brick; 6. Insulating brick. Detailed Implementation

[0015] The invention will be further described below with reference to the accompanying drawings.

[0016] This invention discloses a method for maintaining the regenerator area of ​​a coke oven, the method comprising the following steps: S1. Remove the sealing walls on the top and side walls of the heat storage chamber, and replace the checker bricks inside the heat storage chamber. The replacement quantity is determined based on the condition of the checker bricks, such as melting or blockage. S2. After the sealing wall is removed and the checker bricks are replaced, the grate bricks 5 in the regenerator chamber are replaced, and the aperture of the grate bricks 5 is enlarged by 5-10mm. This will further increase the air flow in the vertical flue of the furnace head, ensuring that more fuel is fully burned, thereby improving energy utilization efficiency, further improving the overall thermal efficiency of the coke oven, reducing harmful gas emissions, and helping to maintain the stability of the temperature inside the coke oven, reducing the impact of temperature fluctuations on the production process, reducing damage to the coke oven caused by thermal stress, and thus extending the service life of the equipment.

[0017] S3. After completing S2, clean the accumulated material inside the small flue 3. Use cleaning tools to clean the accumulated material inside the small flue 3. The accumulated material mainly includes: sulfurous acid and sulfuric acid generated by SO2 and SO3 in the exhaust gas reacting with water; residues produced by coke oven gas leaking from the brick gas duct into the small flue and burning; eroded and detached fragments of the lining of the small flue 3; and material hanging on the flue flaps. This can ensure normal heating inside the small flue 3 of the coke oven, help maintain the efficient operation of the coke oven, reduce uneven heating or blockage caused by material accumulation, thereby improving the overall production efficiency of the coke oven. At the same time, it can reduce the corrosion and wear of the inner wall of the small flue 3 by the accumulated material and extend the service life of the coke oven.

[0018] S4. After the small flue 3 is cleaned, the cracks in the single wall 4 and the main wall 1 of the heat storage chamber are sealed with asbestos rope, high-temperature adhesive and mud. Then, the surface of the single wall 4 and the main wall 1 of the heat storage chamber is coated and sealed with high-temperature adhesive until all the brick joints of the single wall 4 and the main wall 1 of the heat storage chamber are sealed. S5. After the brick joints on the surface of the single wall 4 and the main wall 1 of the heat storage chamber are sealed, fill the grid bricks inside the heat storage chamber and build the heat storage chamber sealing wall. S6. After the sealing walls on the top and side walls of the regenerator are completed, the sealing walls on the top of the regenerator are removed and rebuilt, and the accumulated material inside the inclined channel is cleaned. Ensuring the cleanliness of the inclined channel can effectively clean the accumulated material and bricks at the inclined channel opening of the coke oven vertical flue, ensuring the unobstructed flow of the inclined channel opening and improving the working efficiency of the coke oven.

[0019] S7. After the accumulated material inside the inclined chute has been cleaned, the outer surfaces of the sealing walls on the top and side walls of the regenerator are insulated. The insulation layer is made of asbestos wool, water, and 5% water glass, and is evenly applied to the outer surfaces of the sealing walls on the top and side walls of the regenerator. Asbestos wool, as an insulation material, has good thermal insulation properties and can effectively reduce heat loss, thereby improving the energy efficiency of the coke oven. The use of water glass can also improve the fire resistance and chemical stability of the insulation layer, enabling it to maintain good performance in high-temperature environments. The insulation layer made of asbestos wool, water, and 5% water glass combines the low thermal conductivity of asbestos with the bonding and reinforcing effects of water glass. This combination not only provides excellent thermal insulation but also ensures the structural stability and durability of the insulation layer. In addition, the use of this material can reduce heat loss from the outer walls of the coke oven, thereby reducing energy consumption and improving production efficiency.

[0020] In step S4, the cracks in the single wall 4 and the main wall 1 of the heat storage chamber are sealed with asbestos rope, high-temperature adhesive, and mud. For cracks larger than 5mm, asbestos rope is first filled, and then high-temperature adhesive and mud are applied. For cracks smaller than 5mm, high-temperature adhesive and mud are applied. The surface of the single wall 4 and the main wall 1 of the heat storage chamber is then sealed with high-temperature adhesive slurry. After the high-temperature adhesive slurry dries, the slurry that is not attached to the cracks in the single wall 4 and the main wall 1 of the heat storage chamber is cleaned up, and then the slurry is applied again until all cracks are effectively sealed.

[0021] Cracks in the single wall 4 and main wall 1 of the thermal regenerator were sealed using asbestos rope, high-temperature adhesive, and mortar. The combination of asbestos rope and high-temperature adhesive provides excellent sealing performance. The asbestos rope itself has a certain degree of elasticity and high-temperature resistance, which can form a barrier at the crack to prevent the penetration of gas and liquid. The high-temperature adhesive can fix the asbestos rope at the crack and maintain its bonding strength in high-temperature environments, ensuring the durability of the sealing effect. The thermal regenerator will experience a high-temperature environment during operation, so the sealing material must be able to withstand high temperatures without losing its performance. Both asbestos rope and high-temperature adhesive have excellent high-temperature resistance and can remain stable at high temperatures without deforming or failing due to temperature increases. The sealing method using asbestos rope, high-temperature adhesive, and mortar is relatively simple, easy to construct, reduces the workload of operators, and effectively improves the thermal insulation performance of the single wall 4 and main wall 1 of the thermal regenerator.

[0022] In step S5, after the brick joints are sealed, the heat storage chamber is filled with grid bricks from bottom to top, and the inner and outer sealing walls of the heat storage chamber are built. During the construction process, δ=20mm hard ceramic fiber board is added to the inner and outer sealing walls of the heat storage chamber.

[0023] Adding 20mm thick rigid ceramic fiber boards to the inner and outer walls of the heat storage chamber can significantly improve the thermal insulation and energy-saving performance of the heat storage chamber, while maintaining good fire resistance. This helps reduce heat transfer through the walls, improving insulation performance. The rigid ceramic fiber boards absorb less heat energy, thus improving production efficiency. The bulk density of the rigid ceramic fiber boards is generally 280~330kg / m³, about 1 / 3 of that of lightweight bricks and 1 / 5 of that of lightweight refractory castables. The smaller mass and heat capacity allow for faster temperature rise, further enhancing energy-saving effects. It also has excellent fire resistance and is suitable for high-temperature environments.

Claims

1. A method for maintaining the regenerator area of ​​a coke oven, characterized in that: The method includes the following steps: S1. Remove the sealing walls on the top and side walls of the heat storage chamber, and replace the checker bricks inside the heat storage chamber; S2. After the sealing wall is removed and the grid bricks are replaced, the grate bricks (5) in the heat storage chamber are replaced, and the hole diameter on the grate bricks (5) is enlarged by 5-10mm. S3. After completing S2, clean the accumulated material inside the small flue (3); S4. After the small flue is cleaned, the cracks in the single wall (4) and main wall (1) of the heat storage chamber are sealed with asbestos rope, high-temperature adhesive and mud. Then, the surface of the single wall (4) and main wall (1) of the heat storage chamber is coated and sealed with high-temperature adhesive until all the brick joints on the single wall (4) and main wall (1) of the heat storage chamber are sealed. S5. After the brick joints on the surface of the single wall (4) and the main wall (1) of the heat storage chamber are sealed, fill the grid bricks inside the heat storage chamber and build the heat storage chamber sealing wall. S6. After the sealing walls on the top and side walls of the heat storage chamber are completed, the sealing walls on the top of the heat storage chamber are removed and rebuilt, and the accumulated material inside the ramp is cleaned up. S7. After the accumulated material inside the ramp is cleaned up, the outer surface of the sealing wall of the top and side walls of the heat storage chamber is insulated. The insulation layer is made of asbestos wool, water and 5% water glass. The insulation layer is evenly applied to the outer surface of the sealing wall of the top and side walls of the heat storage chamber.

2. The method for maintaining the coke oven regenerator area as described in claim 1, characterized in that: In step S4, the cracks in the single wall (4) and main wall (1) of the heat storage chamber are sealed with asbestos rope and high-temperature adhesive mud. For gaps larger than 5mm, asbestos rope is first filled and then high-temperature adhesive and mud are applied. For gaps less than 5mm, high-temperature adhesive mortar is used for patching. High-temperature adhesive slurry is also used to seal the surfaces of the single wall (4) and main wall (1) of the heat storage chamber. After the high-temperature adhesive slurry dries, the slurry that is not attached to the cracks of the single wall (4) and main wall (1) of the heat storage chamber is cleaned up and then applied again until all cracks are sealed.

3. A method for maintaining the regenerator area of ​​a coke oven as described in claim 1, characterized in that: In step S5, after the brick joints are sealed, the heat storage chamber is filled with grid bricks from bottom to top, and the inner and outer sealing walls of the heat storage chamber are built. During the construction process, δ=20mm hard ceramic fiber board is added to the inner and outer sealing walls of the heat storage chamber.

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