Optimized use method of graphite electrode of carbonization electric furnace

Abstract

The invention relates to the field of metallurgy, and provides a carbonization electric furnace graphite electrode optimized use method which comprises the following steps: S1, feeding a graphite electrode, and drawing a marking line on the graphite electrode; s2, smelting for multiple times, measuring the shape of the graphite electrode under the marking line after each smelting, and calculating the diameter of the graphite electrode according to the shape of the graphite electrode; s3, when the diameter of the graphite electrode reaches an early warning value, the graphite electrode is offline; and S4, cutting off the part, with the diameter reaching the early warning value, of the graphite electrode, carrying out on-line use again, repeating the steps S1 to S3, assembling a section of new graphite electrode for the graphite electrode subjected to secondary cutting, and waiting for on-line use next time. The graphite electrode offline standard can be accurately judged through laser measurement, and errors caused by manual judgment are avoided. And meanwhile, the graphite electrode can be used on line again after being locally cut off, so that the consumption of the graphite electrode can be saved, hard breakage of the electrode can be avoided, and safe production is realized. And the graphite electrode offline standard can be accurately judged.

Description

Technical Field

[0001] The invention relates to the field of metallurgy, and more specifically to a method for optimizing the use of a carbonization electric furnace graphite electrode. Background Art

[0002] The electric arc furnace carbonization reduction of blast furnace slag uses graphite electrodes as conductive materials. Due to the poor sealing of the electrode holes and the furnace cover, the graphite electrode side is seriously oxidized and consumed. After using more than ten furnaces, it will become thin in the middle and thick at both ends, and the entire electrode will be dumbbell-shaped. Its consumption depends not only on the quality of the electrode itself, but also closely related to the smelting operation and management level. Traditional graphite electrodes have problems such as electrode breakage, tripping, and excessive oxidation consumption during use, resulting in frequent electrode replacement. In order to ensure smelting safety and reduce the risk of electrode breakage, when the waist is thin to a certain extent, the electrode needs to be cooled offline, cut off from the thin part, and then reassembled and put online for use.

[0003] At present, the electrode is mainly removed from the production line by manual visual inspection and experience, which has limited accuracy. Sometimes the electrode is removed from the production line too early, and the electrode is cut off when the diameter is still thick, resulting in waste of graphite electrodes; sometimes the electrode is removed from the production line too late, resulting in the electrode breaking and falling into the furnace during the smelting process due to the thin waist, affecting production. Summary of the invention

[0004] In view of this, the present invention proposes a method for optimizing the use of graphite electrodes in a carbonization electric furnace, which can not only save the consumption of graphite electrodes, but also avoid hard breakage of electrodes, thereby achieving safe production.

[0005] Based on the above purpose, the present invention proposes a method for optimizing the use of carbonization furnace graphite electrodes, comprising the following steps: S1. Put on the graphite electrode and draw a marking line on the graphite electrode; S2, perform multiple smelting, and use laser to measure the shape of the graphite electrode under the marking line after each smelting, and calculate the graphite electrode diameter based on the graphite electrode shape; S3. When the diameter of the graphite electrode reaches the warning value, the graphite electrode is removed from the production line; S4, cut off the part of the graphite electrode whose diameter reaches the warning value, put it back online for use, repeat S1-S3, assemble a new graphite electrode for the graphite electrode after the second cut, and wait for the next online use.

[0006] In some embodiments, in step S1, After the graphite electrode is put on line, the graphite electrode is lowered to the center line position of the slag outlet of the electric furnace, and a marking line is drawn at the position where the graphite electrode is flush with the furnace cover.

[0007] In some embodiments, in step S1, Graphite electrodes are installed in the A, B and C three-phase electrode holes respectively.

[0008] In some embodiments, in step S1, the diameter of the graphite electrode on the line is 610 mm.

[0009] In some embodiments, in step S2, After each smelting, the shape of the graphite electrode from the marking line to 1 meter below was measured, and the diameter of the graphite electrode from the marking line to 1 meter below was calculated.

[0010] In some embodiments, in step S3, after the graphite electrode is offline, the spare graphite electrode is installed in the electrode hole of the offline graphite electrode; In step S4, the graphite electrodes that have been taken offline are put back online and used in other idle electrode holes.

[0011] In some embodiments, in step S4, after the graphite electrode off the production line is cooled, the position with the smallest diameter is selected from the portion of the graphite electrode whose diameter reaches the warning value and cut off.

[0012] In some embodiments, the set warning value range is 350mm~380mm.

[0013] In some embodiments, during the first multiple smelting, 10 heats are smelted; During the second multiple smelting, smelt 5 furnaces.

[0014] In some embodiments, a high temperature protection layer is sprayed on the surface of the graphite electrode.

[0015] The present invention has at least the following beneficial technical effects: The present invention proposes a method for optimizing the use of a carbonization electric furnace graphite electrode, the method comprising: S1, putting a graphite electrode online and drawing a marking line on the graphite electrode; S2, performing multiple smeltings, and using a laser to measure the shape of the graphite electrode under the marking line after each smelting, and calculating the graphite electrode diameter according to the graphite electrode shape; S3, when the graphite electrode diameter reaches a warning value, taking the graphite electrode offline; S4, cutting off the portion of the graphite electrode whose diameter reaches the warning value, putting it online again for use, repeating S1-S3, assembling a new graphite electrode for the graphite electrode after the second cutting, and waiting for the next online use.

[0016] The present invention can accurately determine the graphite electrode offline standard through laser measurement, avoiding errors caused by manual judgment. At the same time, the graphite electrode can be put online again after partial truncation, which can not only save the consumption of graphite electrodes, but also avoid hard breakage of electrodes and achieve safe production. The graphite electrode offline standard can be accurately determined, avoiding errors caused by manual judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 A flow chart of a method for optimizing the use of graphite electrodes for a carbonization furnace according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0018] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0019] In addition, reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as in the embodiments of this application.

[0021] The present invention proposes a method for optimizing the use of graphite electrodes for carbonization furnaces. Figure 1 , including the following steps: S1. Put on the graphite electrode and draw a marking line on the graphite electrode; S2, perform multiple smelting, and use laser to measure the shape of the graphite electrode under the marking line after each smelting, and calculate the graphite electrode diameter based on the graphite electrode shape; S3. When the diameter of the graphite electrode reaches the warning value, the graphite electrode is removed from the production line; S4, cut off the part of the graphite electrode whose diameter reaches the warning value, put it back online for use, repeat S1-S3, assemble a new graphite electrode for the graphite electrode after the second cut, and wait for the next online use.

[0022] The specific steps of the present invention are as follows: A. After the graphite electrode is put on line, first lower it to the center line of the slag outlet of the electric furnace, and draw a mark line where the graphite electrode is flush with the furnace cover.

[0023] B. After the graphite electrode has been used for more than 10 furnaces, at the end of each furnace smelting, use a laser instrument to measure the shape of the graphite electrode from the marking line to 1 meter below, and use the model to calculate the diameter of the graphite electrode in this section.

[0024] C. When the diameter of the electrode section reaches the set warning value, the graphite electrode will be taken offline immediately.

[0025] D. After the graphite electrode is cooled, it is cut off from the thinnest part and put back on line for 5 furnaces. At the end of each furnace, the shape of the graphite electrode 1 meter below the new marking line is measured with a laser instrument, and the diameter of the graphite electrode section is calculated based on the model.

[0026] E. When the diameter of the electrode section reaches the set warning value again, the graphite electrode will be taken offline immediately.

[0027] F. After the graphite electrode is cooled off the line, it is cut from the thinnest part and assembled with a new section of graphite electrode for use next time.

[0028] The present invention provides a method for optimizing the use of graphite electrodes in a carbonization electric furnace. The graphite electrode offline standard can be accurately determined by laser measurement to avoid errors caused by manual judgment. At the same time, the graphite electrode can be put back online for use after partial truncation, which can save the consumption of graphite electrodes and avoid hard breakage of electrodes, thus achieving safe production.

[0029] Traditional contact measurement methods can damage the electrode surface and also affect the accuracy of the measurement. Therefore, non-contact measurement methods are considered, such as the laser scanning measurement used in the present invention, or optical measurement. These methods do not require direct contact with the electrode surface, can avoid damage to the electrode, and can also improve the accuracy and efficiency of the measurement.

[0030] In order to more accurately determine the thinnest part of the graphite electrode, higher precision measuring tools are used, such as high-precision vernier calipers, micrometers or laser rangefinders, etc. These tools have higher measurement accuracy and resolution, and can more accurately measure the diameter or width of the electrode, thereby more accurately determining the position of the thinnest part.

[0031] The present invention chooses to apply image processing technology to the determination of the finest part of the graphite electrode. In addition to laser measurement, it is also necessary to take an image of the electrode surface and process it using image processing technology. Edge detection algorithms such as Canny, Sobel, and Laplacian are used to identify the boundary of the electrode contour, distinguish the electrode from the background, and extract clear edge information. On the basis of edge detection, the contour tracking algorithm (such as Hough transform, minimum circumscribed circle method, etc.) is used to extract the complete contour of the electrode, which can accurately determine the position and size of the finest part of the electrode. It not only has high precision and high efficiency, but also can avoid the influence of human factors on the measurement results. Image processing and laser ranging are integrated to form a complete set of graphite electrode detection methods to achieve the fusion and complementarity of multi-source data.

[0032] At the same time, in order to have a more comprehensive understanding of the quality and performance of the electrode, an electrode quality database is established. The measurement data, production batch, usage time and other information of each electrode are recorded in the database. By analyzing and comparing the data in the database, it is easier to find the change patterns and quality problems of the finest parts of the electrode, so as to take corresponding improvement measures.

[0033] In some embodiments, see Figure 1 , in step S1, After the graphite electrode is put on line, the graphite electrode is lowered to the center line position of the slag outlet of the electric furnace, and a marking line is drawn at the position where the graphite electrode is flush with the furnace cover.

[0034] Drawing marking lines can clearly indicate the monitoring position of graphite electrodes, thereby ensuring accurate positioning and reducing errors during the production process. Marking lines help to quickly locate graphite electrodes that need maintenance or replacement, reducing the time to find and confirm electrode wear and improving maintenance efficiency. When the marking line is worn to a certain extent, it can be used as an early warning signal for replacing the electrode, reminding operators to take timely action to avoid electrode failure due to excessive wear, resulting in production interruptions or equipment damage. Timely replacement of worn electrodes can significantly reduce equipment failure rates and ensure the stability and continuity of the production process. Marking line monitoring helps to reasonably arrange the use and replacement of electrodes to avoid waste and unnecessary cost expenditures.

[0035] In some embodiments, see Figure 1 , in step S1, Graphite electrodes are installed in the A, B and C three-phase electrode holes respectively.

[0036] Ensure that the graphite electrode has sufficient conductivity and high temperature resistance. Select the appropriate graphite electrode specifications according to the size of the A, B, and C three-phase electrode holes. Use compressed air without oil and water to remove impurities and dust in the A, B, and C three-phase electrode holes. Ensure that the A, B, and C three-phase electrode holes are clean and dry, and there are no obstacles that affect the installation of the electrodes.

[0037] Gently screw each graphite electrode into the electrode hole to avoid hitting the thread or damaging the electrode. Use an elastic hook to lift the electrode to the appropriate position and slowly move it down to ensure that the graphite electrode is aligned with the electrode hole. After the electrode is fully screwed in, tighten it with a caliper torque to ensure that the electrode is firmly connected. Check whether the connection between the graphite electrode and the electrode hole is tight and there is no looseness.

[0038] Graphite electrodes have high and efficient electrical conductivity, can ensure stable current transmission, improve production efficiency, can withstand high temperatures, and reduce production interruptions caused by electrode melting. Graphite electrodes have excellent electrical conductivity, can reduce energy loss during current transmission, and reduce energy consumption. Graphite electrodes have excellent high temperature resistance and chemical stability, can reduce equipment damage caused by high temperature and chemical corrosion, and extend equipment life. The present invention helps maintain the stability and consistency of the production process and improve product quality by ensuring the stable performance of graphite electrodes.

[0039] In some embodiments, see Figure 1 In step S1, the diameter of the graphite electrode on the line is 610 mm.

[0040] Graphite electrodes have a larger cross-sectional area and can carry higher current density, thus ensuring stable current transmission during the production process. At the same time, the larger diameter also means that graphite electrodes have stronger high temperature resistance and better mechanical strength, and can withstand thermal and mechanical stress in high temperature environments.

[0041] In some embodiments, see Figure 1 , in step S2, After each smelting, the shape of the graphite electrode from the marking line to 1 meter below was measured, and the diameter of the graphite electrode from the marking line to 1 meter below was calculated.

[0042] By checking the size of the graphite electrode each time, the wear of the graphite electrode can be discovered in time. When the electrode becomes thinner to a certain extent, its conductivity, durability and service life will be affected. If the worn electrode is not discovered and replaced in time, it will cause problems such as circuit failure, equipment performance degradation or safety hazards. Therefore, checking every time can detect problems in time and prevent failures from happening.

[0043] In some embodiments, see Figure 1 , in step S3, after the graphite electrode is offline, the spare graphite electrode is installed in the electrode hole of the offline line; In step S4, the graphite electrodes that have been taken offline are put back online and used in other idle electrode holes.

[0044] When the existing electrode needs to be replaced due to wear, it can be quickly replaced with a spare graphite electrode, which greatly reduces the equipment downtime caused by electrode replacement, ensures the continuity of the production process, avoids production interruptions caused by electrode problems, and improves overall production efficiency. By replacing worn electrodes in a timely manner, damage to the electrode caused by excessive wear can be avoided, thereby reducing electrode loss and replacement costs. Spare electrodes make production plans more flexible, and the electrode use and replacement strategy can be adjusted in time according to production needs, thereby optimizing production costs. By regularly checking the wear of the electrode and replacing the spare electrode in a timely manner, equipment failures caused by excessive electrode wear can be prevented and the service life of the equipment can be extended.

[0045] By assembling and reusing worn electrodes, the electrode materials can be reused, thereby reducing the demand for new electrode materials, helping to save raw materials, reducing production costs, and complying with the concept of sustainable development. Through assembly and reuse, waste generation can be reduced and the negative impact on the environment can be reduced. The assembled electrodes can meet production requirements, so compared to purchasing new electrodes, assembly and reuse can save some costs.

[0046] In some embodiments, see Figure 1 In step S4, after the graphite electrode off the line is cooled, the position with the smallest diameter is selected from the part where the diameter of the graphite electrode reaches the warning value and cut off.

[0047] Ensure accurate cutting position according to the marking line, select appropriate cutting tools, such as diamond blades, laser cutting machines, etc., preheat the electrode before cutting to reduce the thermal stress generated during cutting and prevent electrode oxidation. When cutting, ensure the proper use of cutting speed, pressure and coolant to reduce damage to the electrode.

[0048] When reassembling the electrode, ensure that the newly connected electrode segment is tightly connected to the original electrode without gaps. Use special electrode connection devices, such as threaded connection, crimping, welding, etc., to ensure the reliability and stability of the connection. After assembly, check the connection parts to ensure that there is no looseness or cracks. You can use tools such as torque wrenches to check the tightness of threaded connections.

[0049] In some embodiments, see Figure 1 The set warning value range is 350mm~380mm.

[0050] In some embodiments, see Figure 1 During the first multiple smelting, 10 furnaces are smelted; during the second multiple smelting, 5 furnaces are smelted.

[0051] The electrode diameter detection set in the present invention and the embodiments after using 10 furnaces for the first time and 5 furnaces for the second time, as well as the electrode offline warning value, can be adjusted according to the sealing condition of the electric furnace, the initial diameter of the electrode and the actual smelting conditions, and is not a fixed value.

[0052] In some embodiments, see Figure 1 , a high-temperature protective layer is sprayed on the surface of the graphite electrode.

[0053] Graphite electrodes are prone to oxidation reactions in high temperature environments, resulting in increased electrode consumption and shortened service life. By spraying a high-temperature protective layer on the electrode surface, direct contact between oxygen and graphite can be effectively isolated, thereby improving the high-temperature resistance of the electrode and extending its service life. The high-temperature protective layer can significantly reduce the consumption of graphite electrodes during high-temperature smelting. Experimental and practical application data show that graphite electrodes sprayed with a high-temperature protective layer reduce the consumption rate, thereby greatly saving the use of electrode materials and reducing production costs. Since the high-temperature protective layer can reduce the oxidation consumption of the graphite electrode, it can maintain the stable conductivity of the electrode for a long time. This helps to improve the stability and efficiency of the smelting process, making the smelting process more efficient and energy-saving.

[0054] In some embodiments, a 25.5MVA carbonization electric furnace is used for blast furnace slag reduction and carbonization reaction, and the graphite electrode diameter is 610mm. Assemble new graphite electrodes of phases A, B, and C and put them online for use. Lower the graphite electrode until the end is flush with the center line of the slag outlet, and draw a marking line on the three-phase electrode at the position of the electrode hole in the furnace cover. Add blast furnace slag and carbonaceous reducing agent to the electric furnace, supply power to heat up, and slag after smelting for 3 to 5 hours. Smelt 10 furnaces in this cycle. Starting from the 11th furnace, after each furnace is smelted, lift the electrode, use a laser to measure the shape of the graphite electrode 1 meter below the marking line, and use the model to calculate the diameter of the graphite electrode of this section. At the end of smelting to the 14th furnace, the diameter of the thinnest part of the A phase graphite electrode was measured to be 362mm, reaching the set warning value between 350mm and 380mm, then the graphite electrode of this phase is immediately offline, and the assembled D phase spare graphite electrode is re-online for smelting. After the A-phase graphite electrode is cooled after being taken off the line, it is cut off from the thinnest part. After the B-phase electrode is taken off the line, the cut A-phase electrode is directly put on the line for use, and a new marking line is drawn at the position of the electrode hole on the furnace cover.

[0055] After the A-phase electrode is used for 5 more furnaces, at the end of each furnace smelting, the shape of the graphite electrode from the new marking line to 1 meter below is measured by a laser instrument, and the diameter of the graphite electrode section is calculated based on the model. At the end of the smelting of the 7th furnace, the diameter of the thinnest part of the A-phase graphite electrode is measured to be 375mm, which reaches the set warning value of 350mm~380mm. Then the graphite electrode of this phase is taken offline, and the assembled spare graphite electrode is put back online for smelting. After the A-phase graphite electrode is cooled after being taken offline, it is cut off from the thinnest part, and a new graphite electrode is reassembled for standby use.

[0056] The A, B, and C three-phase electrodes are monitored and replaced in turn, which not only avoids the waste caused by premature offline graphite electrodes, but also prevents the graphite electrodes from breaking and falling into the furnace to affect production. Each graphite electrode can be reused after being cut. The life of the graphite electrode is extended from less than 15 furnaces to more than 20 furnaces, which greatly saves the consumption of graphite electrodes and realizes continuous and stable production.

[0057] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0059] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for optimizing the use of carbonization furnace graphite electrodes, characterized in that: The following steps are involved: S1. Put on the graphite electrode and draw a marking line on the graphite electrode; S2, perform multiple smelting, and use laser to measure the shape of the graphite electrode under the marking line after each smelting, and calculate the graphite electrode diameter based on the graphite electrode shape; S3. When the diameter of the graphite electrode reaches the warning value, the graphite electrode is removed from the production line; S4, cut off the part of the graphite electrode whose diameter reaches the warning value, put it back online for use, repeat S1-S3, assemble a new graphite electrode for the graphite electrode after the second cut, and wait for the next online use.

2. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: In step S1, After the graphite electrode is put on line, the graphite electrode is lowered to the center line position of the slag outlet of the electric furnace, and a marking line is drawn at the position where the graphite electrode is flush with the furnace cover.

3. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: In step S1, Graphite electrodes are installed in the A, B and C three-phase electrode holes respectively.

4. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: In step S1, the diameter of the graphite electrode on the line is 610 mm.

5. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: In step S2, After each smelting, the shape of the graphite electrode from the marking line to 1 meter below was measured, and the diameter of the graphite electrode from the marking line to 1 meter below was calculated.

6. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: The method also includes: In step S3, after the graphite electrode is removed from the production line, the spare graphite electrode is installed in the electrode hole of the removed production line; In step S4, the graphite electrodes that have been taken offline are put back online and used in other idle electrode holes.

7. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: In step S4, after the graphite electrode off the production line is cooled, the position with the smallest diameter is selected from the portion of the graphite electrode whose diameter reaches the warning value and cut.

8. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: The warning value range is set to 350mm~380mm.

9. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: In the first multiple smelting, smelt 10 furnaces; During the second multiple smelting, smelt 5 furnaces.

10. The method for optimizing the use of carbonization furnace graphite electrodes according to claim 1, characterized in that: A high-temperature protective layer is sprayed on the surface of the graphite electrode.

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