A coke oven chamber leakage treatment method

Abstract

The application discloses a coke oven body channeling treatment method, and belongs to the technical field of coke oven maintenance, which comprises the following steps: S1, detecting the temperature field distribution of the outer surface of the coke oven body, and positioning the channeling point based on the temperature field distribution; S2, classifying the channeling point according to the crack width, length, penetration degree and hollow range; S3, pretreating the channeling position: removing the loose, pulverized or peeled refractory bricks, refractory castable and heat insulation materials in the channeling area; S4, carrying out the corresponding grade of refractory repair according to different channeling classification; S5, sequentially restoring or newly building the sealing and heat insulation structure outside the channeling repair area; S6, controlling the heating rate according to the requirements of the coke oven heating or the recovery of the thermal system, so that the repair area is fully dried, oven-dried and sintered; and detecting the temperature field distribution of the outer surface of the coke oven body again to determine whether the channeling point is successfully repaired. The coke oven body channeling treatment method is used for improving the stability, safety and economy of the coke oven operation.

Description

Technical Field

[0001] This invention belongs to the field of coke oven maintenance technology, and particularly relates to a method for controlling leakage in the coke oven body. Background Technology

[0002] Coke ovens operate under high temperatures for extended periods. Frequent adjustments to heat load and mechanical forces on the furnace walls cause material fatigue and thermal stress concentration in critical components such as the furnace walls between the carbonization and combustion chambers, furnace door columns, furnace roof bricks, riser pipe seat bricks, and regenerator walls. This leads to damage such as cracks, voids, dents, and misalignments, ultimately resulting in furnace leakage. This leakage not only causes abnormal cross-contamination of coke oven gas, combustion exhaust gas, and air between the carbonization and combustion chambers, disrupting normal combustion and pressure regimes and significantly increasing energy consumption and reducing coke quality (specifically, lower coke strength and increased ash content), but it can also trigger the escape of combustible gases, posing safety and environmental hazards such as explosion risks and pollution.

[0003] The common methods for controlling leakage in coke oven bodies mainly include the following three:

[0004] Cold repair: This method involves shutting down the furnace for an extended period to allow the entire furnace body to cool down before dismantling and rebuilding large sections of the furnace walls and roof. This method can completely eliminate leakage and provides long-lasting repair results. However, the shutdown time is usually several weeks or even months, resulting in high maintenance costs and significant disruption to production continuity. It is suitable for coke ovens with severe leakage and aging equipment.

[0005] Simple external repair: Simply applying refractory mortar or insulation material to the outside of the leaking area only treats surface cracks and lacks in-depth repair of internal cracks and hollow areas, often only addressing the symptoms and not the root cause. Because the fundamental problem is not solved, leaks are prone to recurrence after a period of operation, resulting in high frequency of repeated repairs and low overall efficiency.

[0006] Decentralized thermal repair: This method involves temporarily sealing localized leaks at high furnace temperatures, typically using fast-curing materials. However, due to limitations in the material's high-temperature resistance, bonding strength, and construction conditions, the repair layer does not bond firmly to the original masonry, resulting in a short service life and requiring frequent maintenance. It is suitable for emergency treatment or minor leaks.

[0007] Common problems with existing technologies include: the difficulty in timely and accurate location of leakage points due to the complex structure, high-temperature environment, and concealment of coke ovens; the lack of quantitative grading standards for leakage severity, leading to crude, often excessive or insufficient, remedial measures; and the reliance on large-scale dismantling and reassembly or repeated repairs, resulting in long construction periods, high repetition, and short lifespans, making it difficult to achieve a balance between safety, economy, and long-term operation. These limitations not only increase operation and maintenance costs but also affect the overall efficiency and reliability of coke ovens.

[0008] Therefore, it is necessary to provide a coke oven leakage control method that is suitable for the structural characteristics of coke ovens, can quickly and accurately locate leakage points and carry out graded treatment, and takes into account both construction efficiency and treatment effect, so as to improve the stability, safety and economy of coke oven operation. Summary of the Invention

[0009] This invention provides a method for controlling leakage in coke oven bodies, which aims to overcome the problems existing in the control of leakage in coke oven bodies, such as inaccurate location of leakage points, mismatched control measures, frequent overhauls, and short service life after control.

[0010] To achieve the above-mentioned technical objectives, the present invention aims to provide a method for controlling leakage in a coke oven body, comprising: S1. Detect the temperature field distribution on the outer surface of the coke oven body, and locate the leakage point based on the temperature field distribution; S2. Based on the crack width, length, penetration degree, and hollow area, classify the leakage points into different levels. S3. Pre-treatment of leakage points: Remove loose, powdery or peeling refractory bricks, refractory castables and insulation materials in the leakage area; S4. For different leakage levels, carry out corresponding fire-resistant repairs. S5. Seal and insulation structures shall be restored or newly constructed on the outside of the leak repair area. S6. Control the heating rate according to the requirements of coke oven heating or restoring thermal regime, so that the repair area is fully dried, baked and sintered; check the temperature field distribution on the outer surface of the coke oven body again to determine whether the leak point has been successfully repaired.

[0011] Furthermore, S1 includes: First, using an infrared thermal imager to comprehensively scan the coke oven sidewalls, endwalls, top, and regenerator shell to obtain the temperature field distribution on the outer surface of the coke oven. Abnormal areas where the outer surface temperature is higher than the temperature difference threshold between adjacent areas are marked as suspected leakage areas. Then, micro-positive or micro-negative pressure leak tests are conducted on the carbonization chamber or combustion chamber corresponding to the suspected leakage area. By adjusting the heating regime of adjacent carbonization chambers and combustion chambers, the pressure in the tested chamber is varied within the range of 120Pa to 180Pa. By observing the flue gas flow direction and changes, combined with the external spraying of foaming leak test liquid or smoke leak test, the location and range of the leakage point are determined.

[0012] Furthermore, the temperature difference threshold is 8℃~15℃.

[0013] Furthermore, S2 includes: making local openings or windows in the insulation layer and steel shell outside the leakage area to expose the corresponding masonry surface.

[0014] Furthermore, S2 includes: using percussion testing, drilling sampling, or non-metallic ultrasonic testing to determine whether there are hollow, void, or through cracks in the masonry in the leakage area, and measuring the length and width of the cracks.

[0015] Furthermore, S2 includes: classifying leakage into the following three levels: Level 1 leakage: crack width less than 1mm, no obvious hollow areas; Secondary leakage: The crack width is 1-2 mm, with localized through cracks and hollow areas; Level III leakage: The crack width is greater than 2mm, the crack is continuous and accompanied by large areas of hollowness, masonry misalignment or obvious deformation.

[0016] Furthermore, S3 includes: First, according to the grading results, without demolishing a large area of ​​masonry, locally cut or open the insulation layer, leveling layer and steel shell on the outside of the leakage area, with the opening size covering the leakage area and extending appropriately in front, behind and above and below to ensure safety; then remove loose, powdery or peeling refractory bricks, refractory castables and insulation materials in the leakage area, and clean cracks and hollow interfaces; finally, correct or replace furnace frames and furnace protection iron parts that are found to have obvious displacement or deformation.

[0017] Furthermore, S4 includes: The method for repairing primary leakage is as follows: Use high-alumina or silica refractory filling material suitable for the working temperature of coke oven, spray the surface of the crack with water or preheat it to the predetermined temperature, use a filling tool to press the high-flowability refractory filling material into the crack to fill the deep part of the crack; after filling, apply a layer of plastic refractory material or a coating-type refractory coating to the surface to form a protective layer. The method for repairing secondary leakage is as follows: Drill holes in the hollow area according to the predetermined hole diameter and hole spacing, and control the drilling depth to 50% to 90% of the masonry thickness; inject low water-cement ratio, high fluidity refractory grout or lightweight refractory castable into the hollow area through the drill holes to fill the hollow cavity; for areas with concentrated local through cracks, replace individual damaged bricks from the carbonization chamber or combustion chamber side during production breaks to restore the integrity of the masonry. The method for repairing level 3 leakage is as follows: Under the premise of ensuring the structural safety and thermal regime of the coke oven, the severely leaking areas are partially dismantled and rebuilt, and the dismantling scope is controlled within the minimum necessary area; according to the original design or optimized masonry structure, high alumina bricks, silica bricks or fiber modules are rebuilt, and stainless steel anchors are used to reliably connect them to the furnace steel structure; steel rings, tie rods or reinforced frames are set on the outside of the masonry to provide rigid or flexible constraints on the rebuilt masonry.

[0018] Furthermore, S5 includes: A flexible fire-resistant fiber layer is arranged near the masonry side to absorb thermal expansion stress; Lightweight insulating castable or insulating bricks are poured or laid on the outside of the masonry to form an insulation layer; The outermost layer is fitted with a weather-resistant leveling layer and a metal protective plate or steel shell, which is fixed by welding or bolts. High-temperature flexible sealant is used to fill the joints between layers to ensure that there are no through gaps between the layers.

[0019] Furthermore, S6 includes: comparing and evaluating the flue gas concentration, furnace surface temperature, and coke oven gas consumption at the leaking points before and after repair. If all indicators meet the preset standards, the leak treatment is deemed qualified, and a treatment record file is created.

[0020] Compared with the prior art, the present invention has the following technical effects: This invention addresses the common and production-impacting problem of coke oven leakage. It proposes a method for controlling coke oven leakage based on graded leakage diagnosis, localized structural repair, and a multi-layered flexible-rigid composite sealing structure. The aim is to achieve efficient and long-term control of coke oven leakage, significantly improving the operational reliability, safety, and economy of coke ovens. Specifically: This invention employs a combined detection method that integrates "infrared thermal imaging detection" and "furnace pressure regulation leak testing." Infrared thermal imaging detection quickly identifies areas of abnormal temperature through non-contact scanning, providing an initial location of potential leaks. Meanwhile, furnace pressure regulation leak testing precisely confirms the location and extent of leaks by adjusting the pressure inside the furnace and monitoring pressure changes. This enables rapid and accurate location of leaks in the coke oven body, avoiding large-scale blind disassembly and inspection, and reducing unnecessary maintenance work and resource waste.

[0021] This invention introduces a graded assessment method for leakage structures. Based on the severity, size, and impact on the furnace structure, leakage is scientifically classified into three levels: Level I (minor leakage), Level II (moderate leakage), and Level III (severe leakage). Corresponding remedial measures are taken for each level: for Level I leakage, a specialized grouting material is used for surface sealing; for Level II leakage, high-performance grout is injected using drilling and grouting technology to fill internal voids; for Level III leakage, localized dismantling and reinforcement are carried out, replacing damaged blocks and enhancing structural strength. This graded remediation approach enables precise repairs, improves maintenance efficiency and quality, and ensures the targeted and effective nature of the remediation.

[0022] This invention combines several techniques, including localized windowing, drilling and grouting, and external steel structure reinforcement, without requiring extensive demolition of masonry. Localized windowing involves creating small openings at specific locations to directly access and treat damaged areas; drilling and grouting injects repair materials into deep cracks to restore structural integrity; and external steel structure reinforcement provides additional support and stability through the installation of custom-designed steel components. This method significantly reduces furnace downtime, minimizes repair work, lowers maintenance costs, and reduces disruption to production processes.

[0023] This invention designs a multi-layered flexible-rigid composite sealing structure, comprising an inner flexible refractory layer, a middle lightweight insulation layer, an outer protective layer, and a flexible sealing layer. The flexible refractory layer is made of high-temperature adaptable materials, capable of withstanding the high temperatures inside the coke oven and absorbing thermal expansion; the lightweight insulation layer uses heat-insulating materials to reduce heat loss and improve energy efficiency; the outer protective layer provides mechanical strength and resistance to environmental corrosion; and the flexible sealing layer ensures the airtightness and long-term stability of the repaired area. This composite structure effectively absorbs thermal expansion and structural deformation, significantly improving the crack resistance, durability, and service life of the repaired area, thereby greatly reducing the occurrence of secondary leaks.

[0024] This invention has broad applicability and can be applied to coke ovens of different ages (from newly built to old) and different types (including tamping coke ovens and machine-pressed coke ovens). Its method is flexible and highly adaptable. It is also highly scalable, enabling efficient control of coke oven leakage while ensuring safe production and continuous operation, providing a reliable technical solution for equipment maintenance and sustainable development in the coking industry. Attached Figure Description

[0025] Figure 1 The flowchart provided is for a preferred embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the present invention, and not all of them. Generally, the embodiments of the present invention described and shown in the accompanying drawings are characteristic technologies and solutions. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Please see Figure 1 A method for controlling leakage in a coke oven body, mainly including: S1. Detect the temperature field distribution on the outer surface of the coke oven body, and locate the leakage point based on the temperature field distribution; S2. Based on the crack width, length, penetration degree, and hollow area, classify the leakage points into different levels. S3. Pre-treatment of leakage points: Remove loose, powdery or peeling refractory bricks, refractory castables and insulation materials in the leakage area; S4. For different leakage levels, carry out corresponding fire-resistant repairs. S5. Seal and insulation structures shall be restored or newly constructed on the outside of the leak repair area. S6. Control the heating rate according to the requirements of coke oven heating or restoring thermal regime, so that the repair area is fully dried, baked and sintered; check the temperature field distribution on the outer surface of the coke oven body again to determine whether the leak point has been successfully repaired.

[0028] To better understand the technical solution of this invention, it will be described in detail below: Step 1: Leakage Prediction and Detection Location Based on the structural characteristics and actual service life of the coke oven, combined with daily monitoring data such as oven temperature trends, oven pressure distribution, chimney suction fluctuations, gas composition analysis, and historical operation and maintenance records, the system predicts key vulnerable areas where gas leakage may occur. These areas mainly include the partition wall between the carbonization chamber and the combustion chamber, the oven door frame column area, the riser pipe base interface, the brickwork on the oven roof surface, the inner and outer walls of the regenerator, and the connection between the oven body and the supporting steel structure.

[0029] A high-precision infrared thermal imager was used to perform a full-coverage scan of the coke oven's side walls, end walls, top surface, and the outer shell of the regenerator, obtaining detailed temperature field distribution images of the outer surface of the oven. Abnormal hot areas with significantly higher outer surface temperatures than adjacent areas and temperature differences exceeding a set threshold (usually 8–15°C) were marked as suspected leakage areas, providing a basis for subsequent precise location.

[0030] For the carbonization chamber or combustion chamber corresponding to the suspected leak area, a slight positive or negative pressure leak test is conducted. By adjusting the heating regime of adjacent carbonization and combustion chambers, the pressure inside the chamber under test is controlled to vary within the range of 120 Pa to 180 Pa. Simultaneously, the flow direction and dynamic changes of flue gas are observed from locations such as furnace door gaps, riser pipe openings, and inspection holes. Combined with methods such as spraying foaming leak test liquid or releasing tracer smoke at suspected locations outside the furnace, the accurate location and scope of the leak are comprehensively determined.

[0031] The identified leakage areas are numbered, and their location, area, abnormal temperature values, and corresponding furnace chamber operating parameters are recorded to form leakage diagnosis data.

[0032] Step 2: Assessment and Classification of Leakage Structures: Under the premise of ensuring the safe operation of the coke oven, the insulation layer and steel shell outside the leakage area are locally opened or opened to accurately expose the corresponding masonry surface so as to carry out subsequent testing.

[0033] Using a variety of techniques such as impact testing, drilling sampling, or non-metallic ultrasonic testing, the system assesses whether there are defects such as hollow areas, voids, or through cracks in the masonry in the leakage area, and accurately measures the actual length and width of the cracks.

[0034] Based on multiple indicators such as crack width, length, penetration degree, and void area, the severity of leakage is divided into the following three levels: Level 1 leakage: The crack width is less than 1mm, mainly consisting of surface micro-cracks, with no obvious hollowing phenomenon, and has little impact on structural safety; Secondary leakage: The crack width is between 1 and 2 mm, with local through cracks and limited hollow areas. The hollow areas are relatively limited, and the overall masonry structure remains basically intact. Level III leakage: The crack width is greater than 2mm, the crack is completely connected and accompanied by large-area hollowing, masonry misalignment or obvious deformation, which has significantly affected the load-bearing capacity and overall stability of the furnace wall.

[0035] Finally, the leakage classification results were clearly marked on the coke oven facade layout and top view layout, providing a reliable basis for the subsequent formulation of differentiated classification and treatment plans.

[0036] Step 3: Pre-treatment of leakage points: Based on the grading assessment results, without large-scale demolition of masonry, local cutting or windowing should be carried out on the outer insulation layer, leveling layer, and steel shell of the area where leakage has occurred. The opening should completely cover the leakage area and extend with appropriate safety widths in the front-back and vertical directions to ensure that the defect is completely exposed and easy to operate.

[0037] Thoroughly remove any loose, powdery, or flaking refractory bricks, refractory castables, and insulation materials from the leak area. Use wire brushes, pneumatic drills, and compressed air to meticulously clean cracks and hollow areas, ensuring the bonding surface between the repair material and the substrate is clean and rough, thus enhancing adhesion strength and durability.

[0038] For structural components such as furnace frames and furnace guard iron parts that are found to have obvious displacement or deformation during inspection, they should be corrected or replaced. Temporary supports should be added or the original constraints should be removed in key areas to prevent further deformation in the leakage area and maintain the overall stability and safety of the structure.

[0039] Step 4: Graded fire-resistant repair: Level 1 Leakage Repair: High-alumina or silica refractory grouting material suitable for coke oven working temperature is used. The surface of the crack is sprayed with water or preheated to a predetermined temperature. High-flow refractory grouting material is pressed into the crack using high-pressure grouting guns or shotcrete machines to fill the deep part of the crack as much as possible. After the grouting is completed, apply a layer of plastic refractory material or a coating-type refractory coating to the surface to form a protective layer.

[0040] Secondary leakage repair: In the hollow areas, boreholes are arranged according to the predetermined hole diameter and spacing, and the drilling depth is controlled at 50% to 90% of the masonry thickness; By drilling, low water-cement ratio, high fluidity refractory grout or lightweight refractory castable is injected into the hollow area to fill the hollow cavity. For areas with concentrated through cracks, individual damaged bricks are replaced from the carbonization chamber or combustion chamber side during production breaks to restore the integrity of the masonry.

[0041] Repairing Level 3 Leakage: Under the premise of ensuring the structural safety and thermal regime of the coke oven, local dismantling and rebuilding shall be carried out in areas with serious leakage, and the scope of dismantling shall be controlled within the minimum necessary area; Rebuild the masonry structure with high-alumina bricks, silica bricks or fiber modules according to the original design or optimized masonry structure, and use stainless steel anchors to reliably connect it to the furnace body steel structure. Steel rings, tie rods, or reinforcing frames are installed on the outside of the masonry to provide rigid or flexible constraints on the rebuilt masonry.

[0042] Step 5: Restoration of multi-layer sealing and insulation layers: After completing the fire-resistant repair, restore or construct new sealing and insulation structures on the outside of the leak repair area, including: A flexible fire-resistant fiber layer is arranged near the masonry side to absorb thermal expansion stress; Lightweight insulating castable or insulating bricks are poured or laid on the outside of the masonry to form an insulation layer; The outermost layer is fitted with a weather-resistant leveling layer and a metal protective plate or steel shell, which is fixed by welding or bolts.

[0043] High-temperature flexible sealing material, ceramic fiber paper, high-temperature sealing rope, or high-temperature sealing adhesive are used to fill the joints between the layers to ensure that there are no through gaps between the layers.

[0044] A sloping transition is applied to the boundary between the repaired area and the original structure to avoid stress concentration caused by abrupt changes in rigidity.

[0045] Step Six: Heating and Effect Verification In accordance with the requirements for heating up or restoring the thermal regime of the coke oven, the heating rate should be strictly controlled and the heating operation should be carried out in stages to ensure that the repair area is gradually and fully dried, baked and sintered, so as to avoid cracking or falling off of the repair material due to excessive temperature change.

[0046] After the coke oven resumes normal production, an infrared thermal imager should be used again to conduct a comprehensive scan of the repaired area to confirm that there are no abnormal high-temperature stripes or local overheating. At the same time, the corresponding carbonization chamber and combustion chamber in this area should be systematically monitored, including key parameters such as furnace pressure fluctuations, furnace temperature distribution, and changes in gas consumption, to ensure that they are within the normal process range.

[0047] A detailed comparison and comprehensive evaluation of core data such as gas concentration at the leakage points before and after treatment, furnace surface temperature distribution, and coke oven gas consumption are conducted. If all indicators meet the preset technical standards, the leakage treatment is deemed qualified. The entire treatment process, monitoring data, and evaluation results are fully recorded and archived to form a traceable treatment record file.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that any improvements, modifications, substitutions or variations made by those skilled in the art without departing from the principle of the present invention should be considered as being included within the protection scope of the present invention.

Claims

1. A method for controlling leakage in a coke oven body, characterized in that, include: S1. Detect the temperature field distribution on the outer surface of the coke oven body, and locate the leakage point based on the temperature field distribution; S2. Based on the crack width, length, penetration degree, and hollow area, classify the leakage points into different levels. S3. Pre-treatment of leakage points: Remove loose, powdery or peeling refractory bricks, refractory castables and insulation materials in the leakage area; S4. For different leakage levels, carry out corresponding fire-resistant repairs. S5. Seal and insulation structures shall be restored or newly constructed on the outside of the leak repair area. S6. Control the heating rate according to the requirements of coke oven heating or restoring thermal regime, so that the repair area is fully dried, baked and sintered; check the temperature field distribution on the outer surface of the coke oven body again to determine whether the leak point has been successfully repaired.

2. The method for controlling leakage in a coke oven body according to claim 1, characterized in that, S1 includes: First, an infrared thermal imager was used to scan the coke oven sidewalls, endwalls, top, and regenerator shell to obtain the temperature field distribution on the outer surface of the coke oven. Abnormal areas where the outer surface temperature was higher than the temperature difference threshold between adjacent areas were marked as suspected leakage areas. Then, a slight positive or negative pressure leak test is conducted in the carbonization chamber or combustion chamber corresponding to the suspected leak area. By adjusting the heating regime of the adjacent carbonization chamber and combustion chamber, the pressure in the chamber under test is varied within the range of 120Pa to 180Pa. By observing the direction and changes of flue gas flow, and in conjunction with the external spraying of foaming leak test liquid or smoke leak test, the location and range of the leak point are determined.

3. The method for controlling leakage in a coke oven body according to claim 2, characterized in that, The temperature difference threshold is 8℃~15℃.

4. The method for controlling leakage in a coke oven body according to claim 1, characterized in that, S2 includes: Make local openings or windows in the insulation layer and steel shell outside the leakage area to expose the corresponding masonry surface.

5. The method for controlling leakage in a coke oven body according to claim 1, characterized in that, S2 includes: using percussion testing, drilling sampling, or non-metallic ultrasonic testing to determine whether there are hollow, void, or through cracks in the masonry in the leakage area, and measuring the length and width of the cracks.

6. The method for controlling leakage in a coke oven body according to claim 1, characterized in that, S2 include: Leakage is classified into the following three levels: Level 1 leakage: crack width less than 1mm, no obvious hollow areas; Secondary leakage: The crack width is 1-2 mm, with localized through cracks and hollow areas; Level III leakage: The crack width is greater than 2mm, the crack is continuous and accompanied by large areas of hollowness, masonry misalignment or obvious deformation.

7. The method for controlling leakage in a coke oven body according to claim 1, characterized in that, S3 includes: First, according to the classification results, without demolishing a large area of ​​masonry, locally cut or open the insulation layer, leveling layer and steel shell on the outside of the leakage area, with the opening size covering the leakage area and extending appropriately in front, behind and above and below for a safe width; then remove loose, powdery or peeling refractory bricks, refractory castables and insulation materials in the leakage area, and clean cracks and hollow interfaces; finally, correct or replace furnace frames and furnace protection iron parts that are found to have obvious displacement or deformation.

8. The method for controlling leakage in a coke oven body according to claim 6, characterized in that, S4 include: The method for repairing primary leakage is as follows: Use high-alumina or silica refractory filling material suitable for the working temperature of coke oven, spray the surface of the crack with water or preheat it to the predetermined temperature, use a filling tool to press the high-flowability refractory filling material into the crack to fill the deep part of the crack; after filling, apply a layer of plastic refractory material or a coating-type refractory coating to the surface to form a protective layer. The method for repairing secondary leakage is as follows: Drill holes in the hollow area according to the predetermined hole diameter and hole spacing, and control the drilling depth to 50% to 90% of the masonry thickness; inject low water-cement ratio, high fluidity refractory grout or lightweight refractory castable into the hollow area through the drill holes to fill the hollow cavity; for areas with concentrated local through cracks, replace individual damaged bricks from the carbonization chamber or combustion chamber side during production breaks to restore the integrity of the masonry. The method for repairing level 3 leakage is as follows: Under the premise of ensuring the structural safety and thermal regime of the coke oven, the severely leaking areas are partially dismantled and rebuilt, and the dismantling scope is controlled within the minimum necessary area; according to the original design or optimized masonry structure, high alumina bricks, silica bricks or fiber modules are rebuilt, and stainless steel anchors are used to reliably connect them to the furnace steel structure; steel rings, tie rods or reinforced frames are set on the outside of the masonry to provide rigid or flexible constraints on the rebuilt masonry.

9. The method for controlling leakage in a coke oven body according to claim 1, characterized in that, S5 include: A flexible fire-resistant fiber layer is arranged near the masonry side to absorb thermal expansion stress; Lightweight insulating castable or insulating bricks are poured or laid on the outside of the masonry to form an insulation layer; The outermost layer is fitted with a weather-resistant leveling layer and a metal protective plate or steel shell, which is fixed by welding or bolts. High-temperature flexible sealant is used to fill the joints between layers to ensure that there are no through gaps between the layers.

10. The method for controlling leakage in a coke oven body according to claim 1, characterized in that, S6 includes: The concentration of flue gas, the surface temperature of the furnace body, and the consumption of coke oven gas at the leaking points before and after the repair are compared and evaluated. If all indicators meet the preset standards, the leak treatment is deemed qualified and a treatment record file is formed.

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