Method for quickly repairing blow-by of 7m coke oven frame and controlling oven temperature
By filling the inside of the coke oven frame with asbestos fiber rope and insulation cotton, and using mud to fill the gaps, combined with the gas cock opening and furnace temperature control, the problem of coke oven frame leakage was solved, the long-term sealing repair and the stability of the furnace temperature were achieved, and the safe and environmentally friendly production of the coke oven was guaranteed.
Patent Information
- Application Number
- CN202511167634.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2025-09-26
AI Technical Summary
The poor sealing of the coke oven frame leads to frequent leakage, affecting the heat consumption and environmental protection production of the coke oven. The existing repair methods are not ideal and unstable, making it difficult to achieve long-term sealing repair and furnace temperature control.
The method of combining asbestos fiber rope and insulation cotton with mud is adopted. By filling asbestos fiber rope and stacked insulation cotton on the inner side of the coke oven frame and filling the gaps with mud, an effective sealing structure is formed, and stable repair is achieved by adjusting the gas cock opening and furnace temperature control.
It improves the thermal repair efficiency of the coke oven frame seal, achieves long-term sealing repair effect, reduces the temperature fluctuation of the carbonization chamber, protects the safety of operators, and ensures the stability and environmental protection of coke oven production.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coke oven repair, and in particular to a method for quickly repairing leakage in a 7m coke oven frame and controlling the oven temperature. Background Art
[0002] During the coke oven production process, the carbonization chamber door needs to be opened and closed once in each coking cycle to complete coal loading and coke pushing. Every time the coke pushing car removes and hangs the oven door, a pressure of more than 4MPa will be applied to the oven frame. With the increase of coke oven age and the influence of external environmental factors, the sealing of the coke oven frame deteriorates, and smoke and fire often occur in the oven frame, which not only affects the heat consumption and gas recovery of the coke oven, but is also very detrimental to the safe and environmentally friendly production of the coke oven.
[0003] In the existing coke oven frame sealing technology, after removing the furnace door, the workers usually wear heat-insulating clothing and, with the help of a vehicle, use a long-handled spray gun and a spatula to spray and patch the leaking parts of the coke oven on both sides of the working furnace. The advantages of this method are short operation time, low labor intensity for the workers, and little impact on the coke oven temperature. However, the repair effect is not ideal, the sealing time is not long, and smoke and fire will still occur after a week of use. Another approach is to use a fake furnace door. A fake furnace door is a simple furnace door slightly smaller than a normal furnace door, with a gap of about 10 to 20 cm between the furnace frame and the four sides. After removing the furnace door, it is hung on the furnace frame horns or placed at the furnace mouth to isolate the heat. The operator uses a vehicle to perform the hot repair work outside the furnace door. The advantages of this method are that it is relatively safe and not easy to get burned. The disadvantages are that the operation time is longer, about 7 to 8 hours, and the carbonization chamber temperature drops significantly, which is difficult to restore control later, affecting the normal rhythm of furnace discharge. In addition, the horizontal iron and block of the fake furnace door are not conducive to the sealing of the furnace frame. Most importantly, the current spray patching method has failed to effectively solve the problem of coke oven frame leakage. The general spray patching is effective for only about one month, and the furnace frame will still leak repeatedly. Therefore, how to improve the efficiency of the coke oven frame sealing operation, obtain a long-term sealing repair effect, and stabilize the carbonization chamber temperature, as well as the production and furnace temperature recovery before and after the operation, is a problem that technicians in this field urgently need to solve. Summary of the Invention
[0004] The purpose of the present invention is to provide a method for quickly repairing leakage in a 7m coke oven frame and controlling the furnace temperature, which can improve the thermal repair efficiency of the furnace frame seal, achieve a long-term sealing repair effect on the furnace frame, reduce large fluctuations in the carbonization chamber furnace temperature, ensure the safety of operators, and provide solutions for furnace temperature regulation and resumption of production during and after the repair operation.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for quickly repairing leakage in a 7m coke oven frame and controlling the oven temperature comprises the following steps: Step 1: Prepare asbestos fiber rope and soak it in mud; Step 2: Prepare several pieces of insulation cotton and use steel wire to adjust the insulation cotton into a bow-shaped structure with a certain curvature so that the insulation cotton can fit the inner side of the coke oven frame just right. Then apply mud on the surface of the insulation cotton and place the pre-treated insulation cotton aside for use. Step 3: Determine the construction conditions for the operating furnace number. After the coke pushing operation in the carbonization chamber of each selected operating furnace number is completed, close the furnace door and keep the furnace empty. The production vehicle continues to perform the furnace unloading operation. If there is a furnace number that is 10 carbonization chambers away from the furnace number to be unloaded, remove the furnace door of the operating furnace number, open the coal loading port cover near the operation point, and start the repair operation of the operating furnace number; Step 4: Attach the insulation cotton to the inner side of the coke oven frame of the furnace to be repaired. Stack multiple insulation cotton layers from bottom to top until they reach the top of the coke oven frame, covering the entire furnace mouth area of the furnace to be repaired, ensuring that no hot air flows out directly, so that the furnace mouth area of the furnace to be repaired is insulated; Step 5: Appropriately reduce the gas cock opening of the furnace to be repaired and its adjacent furnaces; Step 6: For the oven to be repaired, remove the burned asbestos fiber rope between the coke oven frame and the coke oven masonry, and place the soaked asbestos fiber rope into the gap between the coke oven frame and the coke oven masonry. Use mud to repeatedly pour it to ensure that the gap between the coke oven frame and the coke oven masonry is filled until there is no gap. Remove the insulation cotton and complete the repair work. Step 7: Close the furnace door of the repaired furnace number, so that the repaired furnace number is in an empty furnace state. When the surface temperature of the furnace wall of the carbonization chamber reaches above 1000℃ and the average temperature of the cross wall reaches above 1200℃, coal is loaded into the repaired furnace number. The current coal loading amount is controlled to be less than or equal to the standard coal loading amount. After one coal loading operation is completed, the gas cock opening of the repaired furnace number is adjusted to 2% less than the original opening, and the gas cock opening of the furnace number adjacent to the repaired furnace number is restored to the original opening. The furnace temperature of the repaired furnace number is controlled to be 0-40℃ lower than the standard furnace temperature, and the furnace discharge time of the repaired furnace number is controlled to be extended by 0-6h than the standard furnace discharge time. Step 8: Determine whether the coke discharged from the repaired furnace meets the quality requirements. If so, the repaired furnace is fully restored to the normal discharge state. Otherwise, return to step 7.
[0006] Furthermore, in the step 1, the length of the asbestos fiber rope is 20 m, the diameter is 30 mm, and the soaking time of the asbestos fiber rope is set to 24 h.
[0007] Furthermore, in step 2, the insulation cotton has a length of 800 mm, a width of 600 mm, and a thickness of 50 mm.
[0008] Furthermore, in step 2, the distance between the two ends of the heat-insulating cotton in the bow-shaped structure is controlled to be 550-650 mm.
[0009] Furthermore, in step 3, before the repair work begins, the transverse wall temperature of the furnace to be repaired and its adjacent furnaces is measured and adjusted to ensure that the transverse wall temperature is maintained at 1150-1200°C.
[0010] Furthermore, in step 5, the original gas cock opening of each operating furnace number is 50-60%, the gas cock opening of the operating furnace number to be repaired is reduced to 40%, and the gas cock opening of the operating furnace number adjacent to the operating furnace number to be repaired is reduced by 5%.
[0011] Furthermore, in step 6, for the gap filling treatment between the coke oven frame and the coke oven masonry, the slurry is repeatedly poured three times, and the interval time of each pouring is controlled to be 2 minutes.
[0012] Furthermore, in step 6, if there are damaged bricks in the furnace mouth area of the furnace to be repaired, the damaged parts of the bricks are filled and repaired with mud.
[0013] Furthermore, the components of the mud include refractory mud, concentrate powder, phosphoric acid, and water, wherein the ratio between the refractory mud and the concentrate powder is 30%:70%, and the ratio between the phosphoric acid and water is 70%:30%.
[0014] Beneficial effects of the present invention: 1. This method solves the problem that in the actual production process of the coke oven, the asbestos rope and refractory material inside the furnace frame are burned due to the long-term removal of the furnace door, and then the raw gas in the carbonization chamber leaks through the gaps in the furnace frame, resulting in smoke and fire, resulting in a reduced recovery rate of gas and chemical products, and unorganized emissions that do not meet environmental protection standards. This method can improve the thermal repair efficiency of the coke oven frame seal, achieve a good sealing repair effect on the coke oven frame, reduce the large fluctuations in the furnace temperature in the carbonization chamber, and ensure the safety of operators.
[0015] 2. This method specifically controls the oven temperature before and after the oven frame repair operation, effectively ensuring the stability of the coke oven temperature, ensuring the maturity of the coke, reducing the damage to the coke oven wall temperature drop, and gradually restoring the coke oven to a normal production state.
[0016] 3. This method not only improves the effect cycle of coke oven frame sealing repair, but also reduces the heat loss of the coke oven, effectively ensuring that the coke oven can be safe, environmentally friendly, long-lasting and efficient in production operation. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present invention are described below.
[0018] According to a typical embodiment of the present invention, a method for quickly repairing leakage in a 7m coke oven frame and controlling the oven temperature is provided, comprising the following steps: Step 1: Prepare asbestos fiber rope and soak it in mud for 24 hours; Step 2: Prepare several pieces of insulation cotton and use steel wire to adjust the insulation cotton into a bow-shaped structure with a certain curvature so that the insulation cotton can fit the inner side of the coke oven frame just right. Then apply mud on the surface of the insulation cotton and place the pre-treated insulation cotton aside for use. Step 3: Determine the construction conditions for the operating furnace number. After the coke pushing operation in the carbonization chamber of each selected operating furnace number is completed, close the furnace door and keep the furnace empty. The production vehicle continues to perform the furnace unloading operation. If there is a furnace number that is 10 carbonization chambers away from the furnace number to be unloaded, remove the furnace door of the operating furnace number, open the coal loading port cover near the operation point, and simultaneously measure and control the cross wall temperature of the operating furnace number and its adjacent operating furnace numbers to ensure that the cross wall temperature is maintained at 1150-1200℃, and then start the repair operation of the operating furnace number; Step 4: Attach the insulation cotton to the inner side of the coke oven frame of the furnace to be repaired. The mud on the surface of the insulation cotton will solidify due to the high temperature and adhere to the inner side of the coke oven frame to ensure that the insulation cotton will not fall off easily. Multiple insulation cottons are stacked from bottom to top to the top of the coke oven frame, covering the entire furnace mouth area of the furnace to be repaired, ensuring that no hot air flows directly out, so that the furnace mouth area of the furnace to be repaired is insulated; Step 5: Appropriately reduce the gas cock opening of the furnace to be repaired and its adjacent furnaces. Specifically: Under normal circumstances, the original gas cock opening of each furnace is 50-60%. The gas cock opening of the furnace to be repaired is reduced to 40%, and the gas cock opening of the furnaces adjacent to the furnace to be repaired is reduced by 5%. Step 6: For the furnace to be repaired, remove the burned asbestos fiber rope between the coke oven frame and the coke oven masonry, and place the soaked asbestos fiber rope into the gap between the coke oven frame and the coke oven masonry. Use mud to repeatedly pour it three times, with the interval between each pouring controlled at 2 minutes, to ensure that the gap between the coke oven frame and the coke oven masonry is filled until there is no gap. If there are damaged bricks in the furnace mouth area of the furnace to be repaired, use mud to fill and repair the damaged parts of the bricks, remove the insulation cotton, and complete the repair work of the furnace number; Step 7: Close the furnace door of the repaired furnace number, so that the repaired furnace number is in an empty furnace state. When the surface temperature of the furnace wall of the carbonization chamber reaches above 1000℃ and the average temperature of the cross wall reaches above 1200℃, coal is loaded into the repaired furnace number. The current coal loading amount is controlled to be less than or equal to the standard coal loading amount. After one coal loading operation is completed, the gas cock opening of the repaired furnace number is adjusted to 2% less than the original opening, and the gas cock opening of the furnace number adjacent to the repaired furnace number is restored to the original opening. The furnace temperature of the repaired furnace number is controlled to be 0-40℃ lower than the standard furnace temperature, and the furnace discharge time of the repaired furnace number is controlled to be extended by 0-6h than the standard furnace discharge time. Step 8: Determine whether the coke discharged from the repaired furnace meets the quality requirements. If so, the repaired furnace is fully restored to the normal discharge state. Otherwise, return to step 7.
[0019] In step 1, the asbestos fiber rope is 20 meters in length and 30 mm in diameter.
[0020] In step 2, the insulation cotton has a length of 800 mm, a width of 600 mm, and a thickness of 50 mm.
[0021] In the step 2, the distance between the two ends of the heat-insulating cotton in the bow-shaped structure is controlled to be 550-650 mm.
[0022] The components of the slurry include refractory mud, concentrate powder, phosphoric acid and water. The ratio of the refractory mud to the concentrate powder is 30%:70%, and the ratio of the phosphoric acid to water is 70%:30%.
[0023] It should be noted that, for the above steps 7 and 8, under the premise of ensuring that the repaired furnace number is stably restored to the normal furnace discharge state, assuming that the standard coal loading capacity of the furnace number is 52t, the first coal loading capacity is relatively controlled to 48-50t according to the actual cross wall temperature. Based on the actual mass of the coke currently discharged, the next coal loading capacity, furnace temperature and furnace discharge time are judged and controlled. The coal loading capacity is gradually increased and restored to the standard coal loading capacity each time, the furnace temperature is also gradually increased to the standard furnace temperature each time, and the furnace discharge time is also gradually shortened to the standard furnace discharge time. Specifically: if the overall requirement is three discharges Operation, the furnace number of the repaired operation can be fully restored to the normal furnace state. Among them, the first furnace recovery control is: the current coal loading amount is 48t, the current furnace temperature is 40℃ lower than the standard furnace temperature, and the current furnace time is extended by 5h than the standard furnace time; the second furnace recovery control is: the current coal loading amount is 50t, the current furnace temperature is 20℃ lower than the standard furnace temperature, and the current furnace time is extended by 3h than the standard furnace time; the third furnace recovery control is: the current coal loading amount is 52t, the current furnace temperature is restored to the standard furnace temperature, and the current furnace time is extended by 1h than the standard furnace time or adjusted to the standard furnace time.
[0024] Based on the above implementation process of the present invention, the beneficial effects of the present invention are as follows: 1. This method solves the problem that in the actual production process of the coke oven, the asbestos rope and refractory material inside the furnace frame are burned due to the long-term removal of the furnace door, and then the raw gas in the carbonization chamber leaks through the gaps in the furnace frame, resulting in smoke and fire, resulting in a reduced recovery rate of gas and chemical products, and unorganized emissions that do not meet environmental protection standards. This method can improve the thermal repair efficiency of the coke oven frame seal, achieve a good sealing repair effect on the coke oven frame, reduce the large fluctuations in the furnace temperature in the carbonization chamber, and ensure the safety of operators.
[0025] 2. This method specifically controls the oven temperature before and after the oven frame repair operation, effectively ensuring the stability of the coke oven temperature, ensuring the maturity of the coke, reducing the damage to the coke oven wall temperature drop, and gradually restoring the coke oven to a normal production state.
[0026] 3. This method not only improves the effect cycle of coke oven frame sealing repair, but also reduces the heat loss of the coke oven, effectively ensuring that the coke oven can be safe, environmentally friendly, long-lasting and efficient in production operation.
Claims
1. A method for quickly repairing leakage in a 7m coke oven frame and controlling the oven temperature, characterized by: The following steps are involved: Step 1: Prepare asbestos fiber rope and soak it in mud; Step 2: Prepare several pieces of insulation cotton and use steel wire to adjust the insulation cotton into a bow-shaped structure with a certain curvature so that the insulation cotton can fit the inner side of the coke oven frame just right. Then apply mud on the surface of the insulation cotton and place the pre-treated insulation cotton aside for use. Step 3: Determine the construction conditions for the operating furnace number. After the coke pushing operation in the carbonization chamber of each selected operating furnace number is completed, close the furnace door and keep the furnace empty. The production vehicle continues to perform the furnace unloading operation. If there is a furnace number that is 10 carbonization chambers away from the furnace number to be unloaded, remove the furnace door of the operating furnace number, open the coal loading port cover near the operation point, and start the repair operation of the operating furnace number; Step 4: Attach the insulation cotton to the inner side of the coke oven frame of the furnace to be repaired. Stack multiple insulation cotton layers from bottom to top until they reach the top of the coke oven frame, covering the entire furnace mouth area of the furnace to be repaired, ensuring that no hot air flows out directly, so that the furnace mouth area of the furnace to be repaired is insulated; Step 5: Appropriately reduce the gas cock opening of the furnace to be repaired and its adjacent furnaces; Step 6: For the oven to be repaired, remove the burned asbestos fiber rope between the coke oven frame and the coke oven masonry, and place the soaked asbestos fiber rope into the gap between the coke oven frame and the coke oven masonry. Use mud to repeatedly pour it to ensure that the gap between the coke oven frame and the coke oven masonry is filled until there is no gap. Remove the insulation cotton and complete the repair work. Step 7: Close the furnace door of the repaired furnace number, so that the repaired furnace number is in an empty furnace state. When the surface temperature of the furnace wall of the carbonization chamber reaches above 1000℃ and the average temperature of the cross wall reaches above 1200℃, coal is loaded into the repaired furnace number. The current coal loading amount is controlled to be less than or equal to the standard coal loading amount. After one coal loading operation is completed, the gas cock opening of the repaired furnace number is adjusted to 2% less than the original opening, and the gas cock opening of the furnace number adjacent to the repaired furnace number is restored to the original opening. The furnace temperature of the repaired furnace number is controlled to be 0-40℃ lower than the standard furnace temperature, and the furnace discharge time of the repaired furnace number is controlled to be extended by 0-6h than the standard furnace discharge time. Step 8: Determine whether the coke discharged from the repaired furnace meets the quality requirements. If so, the repaired furnace is fully restored to the normal discharge state. Otherwise, return to step 7.
2. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1 is characterized in that: In step 1, the length of the asbestos fiber rope is 20 m, the diameter is 30 mm, and the soaking time of the asbestos fiber rope is set to 24 h.
3. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1 is characterized in that: In step 2, the insulation cotton has a length of 800 mm, a width of 600 mm, and a thickness of 50 mm.
4. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1 or 3, characterized in that: In the step 2, the distance between the two ends of the heat-insulating cotton in the bow-shaped structure is controlled to be 550-650 mm.
5. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1 is characterized in that: In step 3, before the repair work begins, the transverse wall temperature of the furnace to be repaired and its adjacent furnaces is measured and adjusted to ensure that the transverse wall temperature is maintained at 1150-1200°C.
6. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1, characterized in that: In step 5, the original gas cock opening of each operating furnace number is 50-60%, the gas cock opening of the operating furnace number to be repaired is reduced to 40%, and the gas cock opening of the operating furnace number adjacent to the operating furnace number to be repaired is reduced by 5%.
7. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1 is characterized in that: In step 6, the gap between the coke oven frame and the coke oven masonry is filled by repeatedly pouring mud three times, with the interval time of each pouring being controlled to be 2 minutes.
8. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1, characterized in that: In step 6, if there are damaged bricks in the furnace mouth area of the furnace to be repaired, the damaged parts of the bricks are filled and repaired with mud.
9. The method for rapid repair of leakage in a 7m coke oven frame and furnace temperature control according to claim 1, 7 or 8, characterized in that: The components of the slurry include refractory mud, concentrate powder, phosphoric acid and water, wherein the ratio of the refractory mud to the concentrate powder is 30%:70%, and the ratio of the phosphoric acid to water is 70%:30%.