Coke oven gas nozzle positioning translation adjusting operation method

Abstract

The invention discloses a coke oven gas nozzle positioning and translation adjustment operation method, which relates to the technical field of metallurgical coking, and specifically comprises the steps of positioning, translation and comparison, according to the operation method, the nozzle in the lower coal gas spraying pipe is readjusted, so that the problem of poor horizontal exhaust temperature uniformity caused by improper coal gas distribution is solved, the operation method has the characteristics of reliability, short time and quick effect, and the horizontal exhaust temperature uniformity of the coke oven can be quickly improved in a relatively short time.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy coking, in particular to a coke oven gas nozzle positioning and translation adjustment operation method. Background Art

[0002] Magang Coal Coking Company currently operates four JNX2-70-2 2×50-hole coke ovens. These ovens feature a dual-fire channel, exhaust gas recirculation, a separate, downward-regulated regenerator, downward injection of coke oven gas, and side-injection of lean gas. After commissioning, these 7-meter coke ovens experienced poor transverse temperature uniformity and significant temperature gradient deviations. The maximum temperature difference between the standard coke-side fire channel was 90-100°C, resulting in suboptimal temperature distribution and uniformity. This poor transverse temperature uniformity not only affects coke quality but also increases coking heat consumption, negatively impacting energy conservation and emissions reduction.

[0003] This is because the reheating coke oven cannot achieve the optimal gas-air ratio when heated by two types of gas. The coke oven regenerator regulating bricks and combustion chamber regulating bricks regulate different objects when heated by different heating gases. When heated by blast furnace gas, they regulate the amount of gas and air entering the combustion chamber; when heated by coke oven gas, they only regulate the amount of air entering the combustion chamber. The design and arrangement of the regenerator regulating bricks and combustion chamber regulating bricks of the reheating coke oven are based on the optimal heating effect of blast furnace gas, so it is impossible to achieve the optimal gas-air ratio when heated by coke oven gas. The unreasonable arrangement of nozzles causes the gas during coke oven gas heating to enter the brick gas channel through the horizontal pipe, small branch pipe, nozzle, and down nozzle to the various vertical fire channels in the combustion chamber. The resistance during this process includes the resistance of the branch pipe system, the resistance of the nozzle, and the resistance of the combustion chamber. Because the changes in airflow resistance and dynamic pressure in the horizontal pipe are relatively small compared to the horizontal pipe pressure, and the effects of resistance and dynamic pressure on static pressure essentially cancel each other out, the static pressure remains essentially the same at all locations in the horizontal pipe. Therefore, the amount of gas entering each vertical flue is determined by the nozzle diameter set in the lower nozzle. As the flue temperature increases from the engine side to the coke side of the combustion chamber, along with the carbonization chamber and heat consumption, the gas flow and nozzle diameter both gradually increase. For a 60mm taper coke oven with an average nozzle diameter of approximately 9.5mm, the nozzle diameter difference from the third flue on the engine side to the third flue on the coke side is 1.2-1.4mm. For insulation and heat dissipation purposes, the gas flow at the engine-coke side of the furnace head requires a 20%-40% increase in gas flow, necessitating a 10%-20% larger nozzle diameter. The average nozzle diameter for a 7m coke oven is approximately 12.41mm. Configuring the nozzle diameter based on a nozzle diameter difference of 1.2-1.4mm from the third flue on the engine side is unreasonable.

[0004] The traditional approach involves using regulating rods to adjust the gas flow to each flue. Specifically, the combustion chamber gas orifice plate is enlarged to raise the overall combustion chamber temperature, allowing for manual intervention in the coke-side gas flow. After the low-temperature flue on the machine side reaches the target temperature, an iron rod is added to lower the temperature of the high-temperature flue on the coke side to achieve uniformity in the horizontal flue. While this method offers the advantages of rapid and easy operation for horizontal temperature regulation, it also has significant drawbacks. First, impurities in coke oven gas can easily accumulate at the regulating rods, causing nozzle blockage. Especially during the initial operation of a coke oven, residual mud from the brick gas ducts can easily fall onto the regulating rods, clogging the downspout. Second, the increased local resistance created by the inserted regulating rods can limit the flow of decarbonizing air during the downdraft, reducing decarbonization efficiency and easily causing blockage in the lamp base bricks and vertical flues. These two drawbacks can easily lead to a significant drop in vertical flue temperature, making coke pushing difficult. Summary of the Invention

[0005] The object of the present invention is to provide a method for positioning and translating a coke oven gas nozzle to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a method for positioning and translating a coke oven gas nozzle, characterized in that it comprises the following steps:

[0007] S1 positioning: When the K transverse coefficient of the machine side or coke side transverse temperature is greater than 0.9, the standard flue temperature on the machine side or coke side is used as the first positioning point; based on the standard temperature gradient on the machine side and coke side, the nozzle aperture of the standard flue is adjusted. After adjustment, the standard flue on the machine side or coke side is used as the second positioning point;

[0008] S2 translation: Taking the nozzle aperture of the second positioning point as the reference, determine the nozzle aperture difference Δ between the first positioning point and the second positioning point. According to the standard temperature gradient, increase or decrease the aperture of the nozzle holes of the flame channels on both sides of the second positioning point by the corresponding difference Δ, and determine the nozzle aperture of each flame channel No. 1 to 36 in a single combustion chamber;

[0009] S3 comparison: compare the adjusted horizontal temperature. If it does not meet the standard temperature gradient requirements, repeat the above steps until the requirements are met.

[0010] Preferably, the method for adjusting the standard fire channel nozzle aperture in step S1 is to increase or decrease the nozzle aperture.

[0011] Preferably, the standard fire channel on the coke side is fire channel No. 29, and the standard fire channel on the machine side is fire channel No. 8.

[0012] Preferably, the coke oven length is 7m.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention provides a method for positioning and translating coke oven gas nozzles. This method employs a "positioning and translating" adjustment method to improve horizontal temperature uniformity under coke oven gas heating conditions. By changing the gas distribution in the vertical flue, the nozzles in the gas lower nozzle are readjusted to address poor horizontal temperature uniformity caused by improper gas distribution.

[0015] 2. The "positioning and translation" adjustment method is used to adjust the nozzle, eliminating the disadvantages of adjusting with an adjustment rod. It keeps the horizontal temperature uniformity at a high level for a long period of time, so it has a "once and for all" effect.

[0016] 3. This operation method is reliable, time-saving and effective, and can quickly improve the temperature uniformity of the coke oven horizontal row in a relatively short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Adjusted the front horizontal temperature curve for the 7m60 combustion chamber;

[0018] Figure 2 This is the horizontal temperature curve diagram after adjustment of the 7m60 combustion chamber;

[0019] Figure 3 Flowchart of the horizontal nozzle adjustment method.

[0020] In the figure: 1. Upper pipe stop surface; 2. Lower connecting seat; 3. Spring; 4. Hinge pin; 5. Nut; 6. Guide pin; 7. Lug seat; 8. Coupling flange; 9. Cast pipe; 10. Rotating spindle; 11. Coupling; 12. Bearing seat; 13. Pipe stop frame; 14. Cylinder frame; 15. Cylinder. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] The coke oven gas nozzle positioning and translation adjustment operation method of the present invention comprises the following steps:

[0023] 1. When the K coefficient of the horizontal row temperature on the machine side (or coke side) is greater than 0.9, the temperature of the standard fire channel (8th fire channel or 29th fire channel) on the machine side (or coke side) is used as the basis, that is, the "first positioning point". Take the adjustment of the horizontal row temperature of the 60th row combustion chamber of a 7-meter coke oven as an example. The temperature of the 29th standard fire channel on the coke side is normal, and this is used as the first positioning point (see Figure 1 ).

[0024] 2. Based on the standard temperature gradient on the coke side of the machine, the nozzle aperture of the standard fire channel (8 or 29) on the machine side (or coke side) is adjusted. The adjusted standard fire channel on the machine side (or coke side) becomes the "second positioning point." For example, in the case of adjusting the horizontal row temperature of the 60-row combustion chamber of a 7-meter coke oven, the temperature of the standard fire channel No. 8 on the machine side deviated by 127°C from the standard temperature gradient. Therefore, the nozzle aperture of fire channel No. 8 was adjusted from 11.4mm to 11.8mm. After the adjustment, the temperature increased by 58°C, meeting the horizontal row temperature gradient requirements (the temperature gradient allows for a certain range of temperature differences), and this fire channel became the second positioning point.

[0025] 3. Using the nozzle aperture of the second-positioned firing channel as a benchmark, referencing actual temperature conditions and combining the standard horizontal temperature gradient, sequentially shift the nozzle aperture to the vertical firing channels on both sides of the second positioning point to determine the nozzle aperture for each firing channel 1 through 36 in a single combustion chamber. Using a 0.4mm difference in nozzle aperture at the second positioning point as the adjustment standard, sequentially shift the nozzle aperture to the other firing channels. Based on actual temperature conditions and the standard horizontal temperature gradient, determine whether to expand or reduce the nozzle aperture by 0.4mm. If the actual temperature exceeds the standard temperature gradient requirement, the nozzle aperture needs to be reduced; otherwise, it needs to be expanded. The final nozzle aperture adjustment for firing channels 1 through 36 is determined (see Table 1).

[0026] 4. Manually compare the adjusted horizontal temperature (see Figure 2 ), Figure 2 Compared with the horizontal temperature Figure 1 The distribution in the temperature is more uniform, and the adjustment method has a very good effect. If the temperature distribution of each row after adjustment is extremely uneven, you can adjust it again according to the above steps until it meets the requirements.

[0027] Table 1 Nozzle dimensions after positioning and translation adjustment

[0028] Fire Road Nozzle size / mm Fire Road Nozzle size / mm Fire Road Nozzle size / mm Fire Road Nozzle size / mm 1 15.2 10 12.1 19 12.4 28 12.9 2 13.6 11 12.1 20 12.5 29 13 3 11.6 12 12.2 21 12.5 30 13 4 11.7 13 12.2 22 12.6 31 13.2 5 11.8 14 12.2 23 12.6 32 13.2 6 11.9 15 12.3 24 12.7 33 13.4 7 11.9 16 12.3 25 12.7 34 13.6 8 12 17 12.3 26 12.8 35 14.5 9 12 18 12.4 27 12.8 36 16.6

[0029] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for positioning and translational adjustment of a coke oven gas nozzle, characterized in that: The following steps are involved: S1 positioning: When the K transverse coefficient of the machine side or coke side transverse temperature is greater than 0.9, the standard flue temperature on the machine side or coke side is used as the first positioning point; based on the standard temperature gradient on the machine side and coke side, the nozzle aperture of the standard flue is adjusted. After adjustment, the standard flue on the machine side or coke side is used as the second positioning point; S2 translation: Taking the nozzle aperture of the second positioning point as the reference, determine the nozzle aperture difference Δ between the first positioning point and the second positioning point. According to the standard temperature gradient, increase or decrease the aperture of the nozzle holes of the flame channels on both sides of the second positioning point by the corresponding difference Δ, and determine the nozzle aperture of each flame channel No. 1 to 36 in a single combustion chamber; S3 comparison: compare the adjusted horizontal temperature. If it does not meet the standard temperature gradient requirements, repeat the above steps until the requirements are met.

2. The method for adjusting the positioning and translation of a coke oven gas nozzle according to claim 1, characterized in that: The method for adjusting the standard fire channel nozzle aperture in step S1 is to increase or decrease the nozzle aperture.

3. The method for positioning and translation adjustment of a coke oven gas nozzle according to claim 1, characterized in that: The standard fire channel on the coke side is fire channel No. 29, and the standard fire channel on the machine side is fire channel No.

8.

4. The method for adjusting the positioning and translation of a coke oven gas nozzle according to claim 2, characterized in that: The coke oven length is 7m.

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