Converter ignition method, control system and storage medium

Abstract

The invention discloses a converter ignition method, a control system and a storage medium which are applied to the technical field of ferrous metallurgy, and the converter ignition method comprises the steps that gas in an oxygen blowing pipe is adjusted to be nitrogen, the gas is blown to the liquid level in a converter body, and the pressure of the nitrogen is controlled to be 1.0-1.25 MPa; after purging is conducted for 10-30 s, the oxygen blowing pipe is controlled to move to the target lance position in the direction facing the liquid level; adjusting the gas in the oxygen blowing pipe to be mixed gas of nitrogen and oxygen, and gradually reducing the blowing pressure of the mixed gas after blowing for 1-3 seconds; after the injection pressure of the mixed gas is smaller than or equal to 0.2 MPa, the injection pressure of the oxygen is increased, and after the injection pressure of the oxygen reaches 0.4 MPa, continuous injection is conducted for 15 s or above; and the oxygen content in the dust removal pipeline is obtained, after the oxygen content in the dust removal pipeline meets the requirement, the gas in the oxygen blowing pipe is adjusted to be oxygen, and the pressure of the oxygen is increased to the target pressure. According to the method provided by the invention, the converter smelting efficiency and the converter slag remaining amount can be improved, and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of iron and steel metallurgy, and particularly to a converter ignition method, a control system and a storage medium. Background Art

[0002] Converter slag is a by-product of the steelmaking process, and its output is huge. However, due to the presence of harmful elements such as P element and S element in the converter slag, its application in the metallurgical field is restricted. At the same time, the converter slag contains free calcium oxide CaO, or free calcium oxide f-CaO and other substances, and its application in other fields is also greatly restricted.

[0003] In the related art, in order to fully recycle converter slag, when using the converter single slag process, it is necessary to increase the amount of retained slag in the converter. However, when the amount of retained slag is large, after the hot metal is charged, the molten slag and scrap at the bottom of the ladle will pass through the hot metal, float to the surface of the hot metal, and form semi-solid molten slag. These semi-solid molten slags mixed with scrap will hinder the reaction between oxygen and carbon in the hot metal, resulting in difficult ignition. At the same time, if the oxygen lance ignition fails, the oxygen content in the dust removal pipeline will increase, and when using dry dust removal, it is easy to cause dust removal explosion, posing a serious safety risk.

[0004] Therefore, how to effectively improve the success rate of converter ignition is a technical problem that needs to be solved by those skilled in the art at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a converter ignition method, a control system and a storage medium, which are used to realize the automatic control of converter ignition with a large amount of retained slag, reduce the amount of slag pouring, and improve the ignition success rate.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A converter ignition method is applied to a converter. The converter includes a furnace body, an oxygen blowing pipe and a dust removal pipeline installed on the furnace body, and a nitrogen pipeline and an oxygen pipeline are connected to the oxygen blowing pipe; the method includes:

[0008] Step S1: Adjust the gas in the oxygen blowing pipe to nitrogen, blow air to the liquid level in the furnace body, and control the pressure of the nitrogen to be 1.0 - 1.25 MPa;

[0009] Step S2: After purging for 10 - 30 s, control the oxygen blowing pipe to move to a target lance position in the direction of the liquid level;

[0010] Step S3: Adjust the gas in the oxygen blowing pipe to a mixed gas of nitrogen and oxygen, and after spraying for 1 - 3 s, gradually reduce the spraying pressure of the mixed gas;

[0011] Step S4: After the injection pressure of the mixed gas ≤ 0.2 MPa, increase the injection pressure of the oxygen. After the injection pressure of the oxygen reaches 0.4 MPa, perform the ignition operation and continuously inject for a time of more than 15 s;

[0012] Step S5: Obtain the oxygen content in the dust removal pipeline. After the oxygen content in the dust removal pipeline meets the requirements, adjust the gas in the oxygen blowing pipe to oxygen and increase the pressure of the oxygen to the target pressure.

[0013] On the other hand, the step S5 includes:

[0014] Step S51: Obtain the oxygen content in the dust removal pipeline. After the oxygen content in the dust removal pipeline ≥ 15% and the continuous decline time of the oxygen content ≥ 5 s, adjust the gas in the oxygen blowing pipe to oxygen;

[0015] Step S52: Take 24 - 26 s as a cycle and gradually increase the pressure of the oxygen to the intermediate pressure in 3 - 5 times. The intermediate pressure is 0.5 - 0.7 MPa;

[0016] Step S53: Take 18 - 22 s as a cycle and gradually increase the pressure of the oxygen to the target pressure in 2 - 4 times and stabilize for 10 - 15 s. The target pressure is 0.8 - 1.0 MPa.

[0017] On the other hand, the step S52 further includes: maintaining for a time of 10 - 15 s between the pressure increases of the oxygen in two cycles.

[0018] On the other hand, the pressure increase of the oxygen in each cycle is 0.08 - 0.12 MPa, and maintaining for a time of 10 - 15 s between the pressure increases of the oxygen in two cycles.

[0019] On the other hand, in the step S2, the target lance position is 1800 - 1850 mm.

[0020] On the other hand, the step S3 further includes: controlling the nitrogen pressure in the mixed gas to be 0.6 - 0.7 MPa and controlling the oxygen pressure in the mixed gas to be 0.45 - 0.55 MPa.

[0021] On the other hand, the step S4 further includes: after the injection pressure of the mixed gas ≤ 0.2 MPa, increase the pressure of the oxygen until the pressure of the oxygen is increased to 0.4 MPa;

[0022] And the increasing of the pressure of the oxygen includes: increasing in the way that each increase of the pressure of the oxygen ≤ 0.1 MPa and stabilizing for 2 - 5 s after each increase of the oxygen pressure.

[0023] A converter ignition control system, used to execute the above converter ignition method, comprises:

[0024] An oxygen blowing control assembly is installed on the side of the oxygen blowing pipe away from the furnace body, and is used to control the proportion, flow rate and pressure of the gas blown out of the oxygen blowing pipe;

[0025] An oxygen and nitrogen content detection component is installed on the furnace body and is used to obtain the gas content in the furnace body and the dust removal pipeline;

[0026] The controller, the oxygen and nitrogen content detection component and the oxygen blowing control component are both connected to the controller, and the controller is used to obtain the gas content in the furnace body and the dust removal pipeline, and control the oxygen blowing control component according to the gas content in the furnace body and the dust removal pipeline.

[0027] On the other hand, the oxygen blowing control component includes an oxygen blowing pipe position control component, an oxygen-nitrogen switching control component, and an air blowing flow and pressure control component. The oxygen blowing pipe position control component is used to control the movement of the oxygen blowing pipe toward or away from the liquid surface in the furnace body. The oxygen-nitrogen switching control component is used to control the ratio of the gas in the nitrogen pipeline and the oxygen pipeline entering the oxygen blowing pipe. The air blowing flow and pressure control component is used to control the air blowing flow and pressure in the nitrogen pipeline and the oxygen pipeline.

[0028] A storage medium stores computer executable instructions, which, when loaded and executed by a processor, implement the steps of the converter ignition method described above.

[0029] The converter ignition method provided by the present invention is applied to a converter, wherein the converter comprises a furnace body, an oxygen blowing pipe installed on the furnace body and a dust removal pipe, wherein the oxygen blowing pipe is connected to a nitrogen pipe and an oxygen pipe; the method comprises: step S1: adjusting the gas in the oxygen blowing pipe to nitrogen, blowing toward the liquid surface in the furnace body, and controlling the pressure of the nitrogen to be 1.0-1.25MPa; step S2: after blowing for 10-30s, controlling the oxygen blowing pipe to move toward the liquid surface to a target gun position; step S3: adjusting the gas in the oxygen blowing pipe to a mixed gas of nitrogen and oxygen, and after blowing for 1-3s, gradually reducing the blowing pressure of the mixed gas; step S4: when the blowing pressure of the mixed gas is ≤0.2 MPa, increase the blowing pressure of the oxygen, and after the blowing pressure of the oxygen reaches 0.4MPa, continue blowing for more than 15s; Step S5: obtain the oxygen content in the dust removal pipeline, and after the oxygen content in the dust removal pipeline meets the requirements, adjust the gas in the oxygen blowing pipe to oxygen, and increase the pressure of the oxygen to the target pressure. The converter ignition method provided by the present invention can effectively reduce the dry dust removal and explosion problem caused by high oxygen content and improve the safety of equipment operation by detecting the oxygen content in the dust removal pipeline as a basis for judging the gas adjustment in the oxygen blowing pipe, solve the problem of poor ignition of the converter with large slag retention, and improve the converter smelting efficiency; increase the slag retention in the converter, which can fully recover the ferrite, CaO and heat in the converter slag, reduce the consumption of lime and slag, and realize low-cost production of the converter process.

[0030] The converter ignition control system provided by the present invention comprises: a nitrogen pipeline, an oxygen pipeline and an oxygen blowing pipe, wherein the nitrogen pipeline and the oxygen pipeline are both connected to the oxygen blowing pipe for supplying nitrogen or oxygen to the oxygen blowing pipe; an oxygen blowing control component installed on the side of the oxygen blowing pipe away from the furnace body for controlling the proportion, flow rate and pressure of the gas blown out of the oxygen blowing pipe; an oxygen and nitrogen content detection component installed on the furnace body for obtaining the gas content in the furnace body and the dust removal pipe; a controller, wherein the oxygen and nitrogen content detection component and the oxygen blowing control component are both connected to the controller, and the controller is used to obtain the gas content in the furnace body and the dust removal pipe, and control the oxygen blowing control component according to the gas content in the furnace body and the dust removal pipe. The converter ignition control system provided by the present invention is not only conducive to improving the converter ignition efficiency and reducing the explosion accidents of the dry dust removal system caused by human operation through full-automatic control, but also conducive to reducing the labor intensity of operators, realizing the less-manpowered and intelligent production of the converter process, reducing the amount of slag dumping, and improving the ignition success rate.

[0031] The storage medium provided by the present invention stores computer-executable instructions. When the computer-executable instructions are loaded and executed by a processor, the steps of the above converter ignition method are implemented. Since the converter ignition method has the above effects, the storage medium provided by the present invention also has the above effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is a flowchart of a specific embodiment of the converter ignition method provided by the present invention;

[0034] Figure 2 is a flowchart of another specific embodiment of the converter ignition method provided by the present invention;

[0035] Figure 3 is a structural schematic diagram of the converter ignition control system and the converter provided by the present invention.

[0036] Reference numerals:

[0037] 1 - nitrogen pipeline; 2 - oxygen pipeline; 3 - dust removal pipeline; 4 - second oxygen and nitrogen content detector; 5 - oxygen blowing pipe; 6 - first oxygen and nitrogen content detector; 7 - furnace body; 8 - molten steel; 9 - oxygen and nitrogen switching control component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The core of the present invention is to provide a converter ignition method, a control system and a storage medium, which can significantly improve production efficiency and production safety.

[0039] In order to enable those skilled in the art to better understand the solution of the present invention, the following will further elaborate on the present invention in conjunction with the drawings and specific embodiments.

[0040] Please refer to Figures 1 to 3 , Figure 1 is a flowchart of a specific embodiment of the converter ignition method provided by the present invention; Figure 2 is a flowchart of another specific embodiment of the converter ignition method provided by the present invention; Figure 3 is a structural schematic diagram of the converter ignition control system and the converter provided by the present invention.

[0041] In this embodiment, the converter ignition method is applied to a converter. The converter includes a furnace body 7, an oxygen blowing pipe 5 installed on the furnace body 7, and a dust removal pipeline 3. A nitrogen pipeline 1 and an oxygen pipeline 2 are connected to the oxygen blowing pipe 5. The converter ignition method includes:

[0042] Step S1: Adjust the gas in the oxygen blowing pipe 5 to nitrogen, and blow air towards the liquid level in the furnace body 7 to purge the liquid level of the molten steel 8 in the furnace body 7. This can not only discharge the air in the furnace body 7, but also remove the unmelted slag particles and inclusions floating on the liquid level, improve the cleanliness of the molten steel 8, and control the pressure of nitrogen to be 1.0 - 1.25 MPa. If the blowing pressure of nitrogen is too small, the purging time will increase, resulting in a long smelting cycle. If the blowing pressure of nitrogen is too large, steel slag splashing will occur, reducing the recovery rate of iron elements and affecting the benefits;

[0043] Step S2: After purging for 10 - 30 s, control the oxygen blowing pipe 5 to move towards the liquid level to the target lance position. If the purging time is too short, the air cannot be discharged smoothly, resulting in difficulty in ignition. If the purging time is too long, the smelting cycle will increase. Therefore, the preferred purging time is 10 - 30 s;

[0044] Step S3: Adjust the gas in the oxygen blowing pipe 5 to a mixed gas of nitrogen and oxygen, and after blowing for 1 - 3 s, gradually reduce the blowing pressure of the mixed gas;

[0045] Step S4: After the blowing pressure of the mixed gas ≤ 0.2 MPa, increase the blowing pressure of oxygen, and after the blowing pressure of oxygen reaches 0.4 MPa, perform the ignition operation and continuously blow for more than 15 s;

[0046] Step S5: Obtain the oxygen content in the dust removal pipeline 3, and after the oxygen content in the dust removal pipeline 3 meets the requirements, adjust the gas in the oxygen blowing pipe 5 to oxygen and increase the pressure of oxygen to the target pressure.

[0047] The converter ignition method provided by the present invention can effectively reduce the problem of dry dust removal explosion caused by high oxygen content by detecting the oxygen content in the dust removal pipeline 3 and using it as the judgment basis for adjusting the gas in the oxygen blowing pipe 5, improving the safety of equipment operation; solve the problem of poor ignition of converter furnaces with a large slag retention amount, improve the smelting efficiency of the converter; increase the slag retention amount of the converter, fully recover ferrite, CaO, and heat in the converter slag, etc., reduce the consumption of lime and slag, and achieve low-cost production of the converter process.

[0048] In some embodiments, step S5 includes:

[0049] Step S51: Obtain the oxygen content in the dust removal duct 3. After the oxygen content in the dust removal duct 3 ≥ 15% and the continuous decline time of the oxygen content ≥ 5 s, adjust the gas in the oxygen blowing pipe 5 to oxygen. At this time, it indicates that the ignition condition is good;

[0050] Step S52: Take 24 - 26 s as a cycle, and gradually increase the pressure of oxygen to the intermediate pressure in 3 - 5 times. The intermediate pressure is 0.5 - 0.7 MPa; Through the pressurization operation in the first stage, ensure a small increase in the oxygen pressure;

[0051] Step S53: Take 18 - 22 s as a cycle, and gradually increase the pressure of oxygen to the target pressure in 2 - 4 times and stabilize for 10 - 15 s. The target pressure is 0.8 - 1.0 MPa; Through the pressurization operation in the second stage, make the oxygen pressure reach the target pressure. After normal ignition, the normal converter blowing can be started according to the process regulations.

[0052] In some embodiments, step S52 further includes: Keep a time of 10 - 15 s between the pressurizations of oxygen in two cycles, that is, after each cycle of pressurization is completed and stabilized for 10 - 15 s, then perform the pressurization of the next cycle to ensure the smooth rise of the oxygen pressure and avoid abnormal ignition due to too fast an increase in the oxygen pressure.

[0053] In some embodiments, each time the oxygen increases by 0.08 - 0.12 MPa, and keep a time of 10 - 15 s between the pressurizations of oxygen in two cycles. During the pressurization process of the second stage, the time of a single cycle is shortened, and the value of the oxygen pressure increase in a single cycle is also increased compared with the value of the oxygen pressure increase in a single cycle in the first stage, which can improve the efficiency of the oxygen pressure increase.

[0054] In some embodiments, in step S2, the target lance position is 1800 - 1850 mm. If the target lance position is too low, the slag on the molten steel 8 surface will adhere to the oxygen blowing pipe 5. If the target lance position is too high, it will cause inconvenience in ignition. Therefore, it is preferably that the target lance position is 1800 - 1850 mm; The lance position refers to the distance between the nozzle end face of the oxygen blowing pipe 5 and the liquid surface.

[0055] In some embodiments, step S3 further includes: Control the nitrogen pressure in the mixed gas to be 0.6 - 0.7 MPa. If the nitrogen pressure is too small, it will cause an increase in the purging time and a long smelting cycle. If the nitrogen pressure is too large, it will cause steel slag splashing and reduce the recovery rate of iron elements; Control the oxygen pressure in the mixed gas to be 0.45 - 0.55 MPa. If the oxygen pressure is too small, it will cause an increase in the purging time and a long smelting cycle. If the oxygen pressure is too large, it will cause steel slag splashing and reduce the recovery rate of ferrite.

[0056] In some embodiments, step S4 also includes: after the blowing pressure of the mixed gas is ≤0.2 MPa, increasing the pressure of oxygen to 0.4 MPa; firstly exhausting the oxygen in the furnace body 7 by blowing nitrogen, and then gradually increasing the oxygen content in the furnace body 7 by blowing the mixed gas, and after the ignition state is good, gradually adjusting to blowing oxygen.

[0057] In some embodiments, increasing the oxygen pressure includes: increasing the oxygen pressure by ≤0.1 MPa each time, and stabilizing the oxygen pressure for 2-5 seconds each time. Increasing the oxygen pressure in the above manner is to achieve a rapid and small increase in the oxygen pressure, avoid the oxygen pressure increase being too large, causing the dust removal pipeline 3 to explode, and reduce the probability of safety accidents.

[0058] In addition to the above converter ignition method, the present invention also provides a converter ignition control system. The converter ignition control system comprises:

[0059] A nitrogen pipeline 1, an oxygen pipeline 2 and an oxygen blowing pipe 5, wherein the nitrogen pipeline 1 and the oxygen pipeline 2 are both connected to the oxygen blowing pipe 5, and are used to supply nitrogen or oxygen into the oxygen blowing pipe 5;

[0060] The oxygen blowing control assembly is installed on the side of the oxygen blowing pipe 5 away from the furnace body 7, and is used to control the proportion, flow rate and pressure of the gas blown out of the oxygen blowing pipe 5;

[0061] The oxygen and nitrogen content detection component is installed on the furnace body 7 and is used to obtain the gas content in the furnace body 7 and the dust removal pipeline 3; specifically, the oxygen and nitrogen content detection component includes a first oxygen and nitrogen content detector 6 and a second oxygen and nitrogen content detector 4. The first oxygen and nitrogen content detector 6 is installed in the furnace body 7 of the converter and is used to obtain the oxygen content in the inner cavity of the furnace body 7. The control of the oxygen content in the furnace body 7 during the converter steelmaking process is a dynamic process, which needs to be adjusted according to the different stages of blowing and actual conditions. The oxygen content in the furnace body 7 is obtained by the first oxygen and nitrogen content detector 6. By accurately controlling the oxygen content, the quality and production efficiency of the steel can be improved; the second oxygen and nitrogen content detector 4 is installed in the dust removal pipeline 3 and is used to obtain the oxygen content in the dust removal pipeline 3 as a basis for judging the gas adjustment in the oxygen blowing pipe 5;

[0062] The controller, the oxygen and nitrogen content detection component and the oxygen blowing control component are all connected to the controller, and the controller is used to obtain the gas content in the furnace body 7 and the dust removal pipeline 3, and control the oxygen blowing control component according to the gas content in the furnace body 7 and the dust removal pipeline 3.

[0063] Specifically, before the actual converter ignition operation, it is also necessary to determine whether the blowing control component is normal; if not, manually check for problems with the blowing control component; if so, determine whether the oxygen-nitrogen content detection component is normal; if not, manually check for problems with the oxygen-nitrogen content detection component.

[0064] The converter ignition control system provided by the present invention, through full-automatic control, not only helps to improve the converter ignition efficiency and reduce the explosion venting accident of the dry dust removal system caused by manual operation, but also helps to reduce the labor intensity of operators, realize the less-manned and intelligent production of the converter process, reduce the slag pouring volume, and improve the ignition success rate.

[0065] In some embodiments, the oxygen blowing control component includes a blowing pipe 5 position control component, an oxygen-nitrogen switching control component 9, and a blowing flow rate and pressure control component. The blowing pipe 5 position control component is used to control the movement of the blowing pipe 5 in a direction approaching or moving away from the liquid level in the furnace body 7. The oxygen-nitrogen switching control component 9 is used to control the ratio of the gas in the nitrogen pipeline 1 and the oxygen pipeline 2 entering the blowing pipe 5. The blowing flow rate and pressure control component is used to control the blowing flow rate and pressure in the nitrogen pipeline 1 and the oxygen pipeline 2. Specifically, when it is determined that the blowing control component is abnormal, it is necessary to manually check whether there are problems with the blowing pipe 5 position control component, the oxygen-nitrogen switching control component 9, and the blowing flow rate and pressure control component respectively. When there are no problems with the blowing pipe 5 position control component, the oxygen-nitrogen switching control component 9, and the blowing flow rate and pressure control component, check whether there is a problem with the oxygen-nitrogen content detection component. Only when there is no problem with the oxygen-nitrogen content detection component can the blowing pipe 5 be opened.

[0066] In a specific embodiment, the converter ignition method includes:

[0067] Step S1: Adjust the gas in the blowing pipe 5 to nitrogen, blow gas towards the liquid level in the furnace body 7, and control the pressure of nitrogen to be 1.0 - 1.25 MPa;

[0068] Step S2: After purging for 10 - 30 s, control the blowing pipe 5 to move towards the liquid level to the target lance position;

[0069] Step S3: Adjust the gas in the blowing pipe 5 to a mixed gas of nitrogen and oxygen. After injecting for 1 - 3 s, gradually reduce the injection pressure of the mixed gas;

[0070] Step S4: After the injection pressure of the mixed gas ≤ 0.2 MPa, increase the injection pressure of oxygen. After the injection pressure of oxygen reaches 0.4 MPa, perform the ignition operation and continuously inject for more than 15 s;

[0071] Step S51: Obtain the oxygen content in the dust removal duct 3. After the oxygen content in the dust removal duct 3 is ≥ 15% and the continuous decline time of the oxygen content is ≥ 5 s, adjust the gas in the oxygen blowing pipe 5 to oxygen;

[0072] Step S52: Take 25 s as a cycle and gradually increase the pressure of oxygen to the intermediate pressure in 4 times. The intermediate pressure is 0.5 - 0.7 MPa; Keep the time for 10 - 15 s between the pressure increases of two cycles of oxygen;

[0073] Step S53: Take 20 s as a cycle and gradually increase the pressure of oxygen to the target pressure in 3 times and stabilize for 15 s. The target pressure is 0.8 - 1.0 MPa; The oxygen increases by 0.08 - 0.12 MPa per cycle, and keep the time for 10 - 15 s between the pressure increases of two cycles of oxygen.

[0074] Furthermore, the situation of continuously carrying out 20 converter productions respectively by using the ignition method in the related technology and the ignition method in this application is shown in Table 1.

[0075] It can be seen from the data comparison in Table 1 that compared with the ignition method in the related technology, by using the converter ignition method provided in this application, on the basis of reducing the slag pouring amount by 1.1 t, the ignition success rate reaches 100%, and the consumption of steel materials is reduced by 0.6 kg; This converter ignition method and converter ignition control system can effectively improve the ignition success rate, reduce the raw material efficiency, save costs and improve competitiveness.

[0076] Table 1 Differences between the related technology and this application

[0077]

[0078] In addition to the above converter ignition method, the present invention also provides a storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are loaded and executed by a processor, the steps of the converter ignition method as described above are implemented.

[0079] The converter ignition method, control system and storage medium provided by the present invention are introduced in detail above. Specific examples are used in this article to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A converter ignition method is applied to a converter. The converter includes a furnace body (7), an oxygen blowing pipe (5) and a dust removal pipeline (3) installed on the furnace body (7). A nitrogen pipeline (1) and an oxygen pipeline (2) are connected to the oxygen blowing pipe (5); characterized in that, include: Step S1: adjusting the gas in the oxygen blowing pipe (5) to nitrogen, blowing the gas toward the liquid surface in the furnace body (7), and controlling the pressure of the nitrogen to be 1.0-1.25 MPa; Step S2: after purging for 10-30 seconds, controlling the oxygen blowing tube (5) to move toward the liquid surface to a target gun position; Step S3: adjusting the gas in the oxygen blowing pipe (5) to a mixed gas of nitrogen and oxygen, and gradually reducing the blowing pressure of the mixed gas after blowing for 1-3 seconds; Step S4: after the injection pressure of the mixed gas is ≤0.2 MPa, the injection pressure of the oxygen is increased, and after the injection pressure of the oxygen reaches 0.4 MPa, an ignition operation is performed, and the injection is continued for more than 15 seconds; Step S5: obtaining the oxygen content in the dust removal pipeline (3), and after the oxygen content in the dust removal pipeline (3) meets the requirements, adjusting the gas in the oxygen blowing pipe (5) to oxygen, and increasing the pressure of the oxygen to the target pressure.

2. The converter ignition method according to claim 1, wherein The step S5 comprises: Step S51: obtaining the oxygen content in the dust removal pipeline (3); when the oxygen content in the dust removal pipeline (3) is ≥15% and the oxygen content continues to decrease for ≥5 seconds, adjusting the gas in the oxygen blowing pipe (5) to oxygen; Step S52: increasing the pressure of the oxygen to an intermediate pressure in 3-5 times with a cycle of 24-26 seconds, wherein the intermediate pressure is 0.5-0.7 MPa; Step S53: gradually increasing the pressure of the oxygen to the target pressure in 2-4 times with a cycle of 18-22 seconds, and stabilizing it for 10-15 seconds. The target pressure is 0.8-1.0 MPa.

3. The converter ignition method according to claim 2, characterized in that, The step S52 further comprises: maintaining a time of 10-15 seconds between the two cycles of pressurization of the oxygen.

4. The converter ignition method according to claim 3, characterized in that, The pressure increase of each cycle of the oxygen is 0.08-0.12 MPa, and the pressure increase time between two cycles of the oxygen is maintained for 10-15 seconds.

5. The converter ignition method according to claim 1, characterized in that In step S2, the target gun position is 1800-1850 mm.

6. The converter ignition method according to claim 1, characterized in that, The step S3 also includes: controlling the nitrogen pressure in the mixed gas to be 0.6-0.7 MPa, and controlling the oxygen pressure in the mixed gas to be 0.45-0.55 MPa.

7. The converter ignition method according to any one of claims 1 to 6, characterized in that The step S4 further comprises: after the injection pressure of the mixed gas is less than or equal to 0.2 MPa, increasing the pressure of the oxygen until the pressure of the oxygen is increased to 0.4 MPa; Furthermore, increasing the pressure of the oxygen includes increasing the pressure of the oxygen by ≤0.1 MPa each time and stabilizing the pressure of the oxygen for 2-5 seconds each time.

8. A converter ignition control system for implementing the converter ignition method according to any one of claims 1 to 7, characterized in that, include: an oxygen blowing control component, installed on a side of the oxygen blowing pipe (5) away from the furnace body (7), and used for controlling the proportion, flow rate and pressure of the gas blown out of the oxygen blowing pipe (5); an oxygen and nitrogen content detection component, mounted on the furnace body (7) and used to obtain the gas content in the furnace body (7) and in the dust removal pipeline (3); A controller, the oxygen and nitrogen content detection component and the oxygen blowing control component are both connected to the controller, and the controller is used to obtain the gas content in the furnace body (7) and the dust removal pipeline (3), and control the oxygen blowing control component according to the gas content in the furnace body (7) and the dust removal pipeline (3).

9. The converter ignition control system according to claim 8, wherein The oxygen blowing control component includes a blowing pipe (5) position control component, an oxygen-nitrogen switching control component (9), and a blowing gas flow and pressure control component. The blowing pipe (5) position control component is used to control the movement of the blowing pipe (5) in a direction approaching or away from the liquid level in the furnace body (7). The oxygen-nitrogen switching control component (9) is used to control the proportion of the gas in the nitrogen pipeline (1) and the oxygen pipeline (2) entering the blowing pipe (5), and the blowing gas flow and pressure control component is used to control the blowing gas flow and pressure in the nitrogen pipeline (1) and the oxygen pipeline (2).

10. A storage medium, characterized in that, The storage medium stores computer-executable instructions, and when the computer-executable instructions are loaded and executed by a processor, the steps of the converter ignition method according to any one of claims 1 to 7 are implemented.

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