A method for fully automatic desulfurization of hot metal pretreatment

Abstract

The present invention relates to the technical field of iron and steel metallurgy industry, and discloses a method for fully automatic desulfurization of hot metal pretreatment, comprising the following steps: S1. The trolley moves to the temperature measurement and sampling position: After the hot metal ladle is seated, the operator confirms that the overhead crane has been unhooked, and the operator clicks to start the treatment, and the trolley automatically travels to the temperature measurement and sampling position; S2. Front temperature measurement: According to the hot metal liquid level height calculated by the pretreatment model, the insertion depth and residence time of the temperature measurement and sampling gun are automatically set. After the trolley enters the temperature measurement and sampling position, the temperature measurement gun automatically starts to perform temperature measurement and sampling; S3. The trolley moves to the stirring and slag skimming position: After the temperature measurement is completed, the trolley automatically starts and stops at the stirring and slag skimming position. The present invention significantly reduces the operation workload of the operator, improves the KR operation efficiency; the automation ability is improved, the KR desulfurization time can be accurately controlled, and the control efficiency is improved. It avoids the fluctuations in safety, production, equipment and product quality caused by the uncertainty of human factors, and causes losses to the enterprise.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy industry, in particular to a method for fully automatic desulfurization of molten iron pretreatment. Background Art

[0002] In the field of iron and steel metallurgy, steelmaking is a very important link, and the hot metal pretreatment process is an important part of the steelmaking process. The current mainstream hot metal pretreatment process is the stirring desulfurization method, the main equipment is the stirring paddle rotation and lifting device, supplemented by the desulfurizer feeding system, trolley, slag removal system, temperature measurement and sampling system and other auxiliary equipment.

[0003] When hot metal desulfurization is being carried out, the hot metal ladle is hoisted by the crane to the ladle hoisting position of the hot metal desulfurization station, and the hot metal ladle trolley parked here is seated. The hot metal ladle trolley is driven to the temperature measurement and sampling position, and the first temperature measurement and sampling are carried out first, and then it is driven to the stirring and slag removal position. According to the process requirements of the steel grade, it is determined whether to carry out the front slag removal. If so, the hot metal ladle is tilted for the front slag removal operation. After removing the blast furnace slag as much as possible, after the hot metal ladle is reset, the stirring paddle lifting device controls the stirring paddle to drop below the hot metal liquid level, and the stirring and rotating device starts to stir the hot metal, so that the hot metal produces a vortex. At the same time, the desulfurizer is added to the hot metal ladle through the feeding system, and the desulfurizer and the sulfur in the hot metal react with desulfurization during continuous stirring. After the stirring is completed, the hot metal ladle is tilted, and the slag removal machine is used for slag removal, and then the temperature measurement and sampling are carried out after the treatment. Finally, the hot metal ladle trolley is driven to the feeding span, and the hot metal ladle is hoisted by the crane to add hot metal to the converter.

[0004] In the current process control of molten iron pretreatment, it can be divided into the following process contents: trolley travel, temperature measurement and sampling, tilting and slag removal, and stirring and desulfurization. From any link alone, automatic process processing has been achieved without human intervention. For example, temperature measurement and sampling can be automatically completed by setting the insertion depth according to the height of the molten iron liquid level. Slag removal can be completed according to the on-site detection components and industrial vision system. Stirring and desulfurization is automatically completed with the cooperation of the feeding system based on the desulfurizer weight and stirring time calculated by the model.

[0005] Every operation link in the entire KR desulfurization process requires manual operation confirmation and implementation on the operation screen. The operation workload is heavy, and the operators always insist on staying at a molten iron pretreatment station. The optimal configuration of personnel quantity and work efficiency is not achieved. In addition, human uncertainty will bring fluctuations in safety, production, equipment and product quality, causing losses to the company.

[0006] With the continuous advancement of industrialization and the continuous improvement of basic automation capabilities, when all links have been automated, a KR process that can automatically complete operations throughout the entire KR desulfurization cycle should be developed to improve the above problems. Summary of the invention

[0007] (1) Technical problems to be solved

[0008] In view of the deficiencies of the prior art, the present invention provides a method for fully automatic desulfurization of hot metal pretreatment, which solves the problems existing in the above-mentioned background art.

[0009] (2) Technical solutions

[0010] To achieve the above object, the present invention provides the following technical solutions: A method for fully automatic desulfurization of hot metal pretreatment, comprising the following steps:

[0011] S1. The trolley moves to the temperature measurement and sampling position: After the hot metal ladle is seated, the operator confirms that the overhead crane has been unhooked, and clicks "processing start" by the operator, and the trolley automatically travels to the temperature measurement and sampling position;

[0012] S2. Pre-temperature measurement: According to the height of the hot metal liquid level calculated by the pretreatment model, the insertion depth and residence time of the temperature measurement and sampling gun are automatically set. After the trolley moves to the temperature measurement and sampling position, the temperature measurement gun automatically starts to perform temperature measurement and sampling;

[0013] S3. The trolley moves to the stirring and slag skimming position: After the temperature measurement is completed, the trolley automatically starts and stops at the stirring and slag skimming position;

[0014] S4. Pre-slag skimming: After the trolley is in place, the automatic slag skimming system issues an instruction to start tilting the hot metal ladle and skimming the slag. When the industrial vision system determines that the exposed area of the hot metal meets the process requirements, the pre-slag skimming ends and the hot metal ladle is reset;

[0015] S5. Stirring desulfurization: According to the height of the hot metal liquid level, the input weight of the desulfurizer, the stirring time, the insertion depth of the stirring paddle, the medium and high-speed stirring speed, etc. calculated by the pretreatment model; After the hot metal ladle is reset, the mechanical stirring system automatically starts to perform stirring desulfurization operations;

[0016] S6. Post-slag skimming: The process is the same as pre-slag skimming. After each automatic post-slag skimming by the automatic slag skimming system ends, the automatic detection function of the slag pot is started. According to the volume of the slag in the slag pot and the shape of the slag heap, the effective space in the slag pot is identified, and it is judged whether the effective space can meet the slag skimming requirement of the next furnace. If the effective space cannot meet the slag skimming requirement of the next furnace, a slag pot replacement signal is triggered to prompt the slag pot replacement operation;

[0017] S7. The trolley automatically travels to the sampling position at the parking space: After the post-slag skimming ends and the hot metal ladle is reset, the trolley automatically starts and stops at the temperature measurement and sampling position;

[0018] S8. Post-temperature measurement: The process is the same as pre-temperature measurement and sampling.

[0019] Preferably, the method further includes abnormal state handling: The entire KR desulfurization process design has many process links, a wide range of signals and programs; therefore, abnormal state handling must be considered.

[0020] First, complex interlock conditions are designed for the connection between each operation link. Before the system runs automatically, program self-check is first performed. After all interlock conditions are met, it is considered that the KR automatic desulfurization condition is available; after the automatic processing starts, before entering the next operation link, the program also performs interlock condition self-check. If the entry condition is not met, the current production link will stop.

[0021] Secondly, time protection is set between each operation link of the system. Under normal circumstances, the time to complete this step is relatively fixed. If it exceeds the fixed time, it means that an abnormal situation may occur within the state of this step. At this time, the automatic program will perform an interruption process.

[0022] Finally, the operator's authority is maximized. If the operator believes that there is a deviation in the execution of this step, this step can be interrupted and processed manually; after an abnormal interruption, according to the time situation, you can choose to continue the automatic process or switch to manual processing; after the processing of this heat is completed, the abnormal interruption situation will also be restored accordingly.

[0023] Preferably, the method further includes monitoring: All process steps are displayed on the operation screen. Normal process steps and abnormally interrupted steps have special marks on the operation screen, and there is an obvious prompt sound when the process is interrupted.

[0024] Preferably, in S5, the rotation speed of the stirring paddle is automatically controlled according to the current situation. The maximum current of the stirring paddle rotation motor is 680A, and the maximum rotation speed of the stirring paddle is 130 rpm / min; when the current of the stirring paddle rotation motor <680A, the rotation speed of the stirring paddle is automatically increased to a maximum of 130 rpm / min; when the current reaches the alarm value during the speed increase process, the speed increase is aborted. When the current decrease value >25A, the speed increase can continue; when the current of the stirring paddle rotation motor >680A, the rotation speed of the stirring paddle will no longer increase.

[0025] (III) Beneficial effects

[0026] The present invention provides a method for fully automatic desulfurization of hot metal pretreatment, which has the following beneficial effects:

[0027] The present invention significantly reduces the operation workload of operators and improves the operation efficiency of KR; the automation ability is improved, and the KR desulfurization time and control efficiency can be accurately controlled. It avoids the fluctuations in safety, production, equipment and product quality caused by human uncertainties and causes losses to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the method flow. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figure 1 shown, the present invention provides a technical solution: a method for fully automatic desulfurization of hot metal pretreatment, including the following steps:

[0031] S1. The trolley moves to the temperature measurement and sampling position: After the hot metal ladle is seated, the operator confirms that the overhead crane has been unhooked, and the operator clicks to start the treatment (the only operation required by the operator during the entire KR desulfurization process), and the trolley automatically travels to the temperature measurement and sampling position;

[0032] S2. Pre-temperature measurement: According to the hot metal liquid level height calculated by the pretreatment model, the insertion depth and residence time of the temperature measurement and sampling gun are automatically set. After the trolley moves to the temperature measurement and sampling position, the temperature measurement gun automatically starts to perform temperature measurement and sampling;

[0033] S3. The trolley moves to the stirring and slag skimming position: After the temperature measurement is completed, the trolley automatically starts and stops at the stirring and slag skimming position;

[0034] S4. Pre-slag skimming: After the trolley is in place, the automatic slag skimming system issues an instruction to start tilting the hot metal ladle and skimming the slag. When the industrial vision system determines that the exposed area of the hot metal meets the process requirements, the pre-slag skimming ends and the hot metal ladle is reset;

[0035] S5. Stirring desulfurization: According to the hot metal liquid level height, desulfurizer input weight, stirring time, stirring paddle insertion depth, medium and high speed stirring speed, etc. calculated by the pretreatment model; after the hot metal ladle is reset, the mechanical stirring system automatically starts to perform stirring desulfurization operations. The rotation speed of the stirring paddle is automatically controlled according to the current situation. The maximum current of the stirring paddle rotation motor is 680A, and the maximum rotation speed of the stirring paddle is 130 rpm / min; when the current of the stirring paddle rotation motor < 680A, the rotation speed of the stirring paddle automatically increases, with a maximum of 130 rpm / min; during the speed increase process, when the current reaches the alarm value, the speed increase is aborted, and when the current decrease value > 25A, the speed increase can continue; when the current of the stirring paddle rotation motor > 680A, the rotation speed of the stirring paddle no longer increases;

[0036] S6. Post slag removal: The process is the same as that of pre-slag removal. After each automatic post-slag removal by the automatic slag removal system, the automatic detection function of the slag pot is started. The effective space in the slag pot is identified according to the volume of the slag and the shape of the slag heap in the slag pot, and it is judged whether the effective space can meet the slag removal requirements of the next furnace (including pre- and post-slag removal). If the effective space cannot meet the slag removal requirements of the next furnace, a slag pot replacement signal is triggered to prompt for slag pot replacement operation;

[0037] S7. The trolley automatically travels to the sampling position at the parking space: After the post-slag removal is completed and the hot metal ladle is reset, the trolley automatically starts and stops at the temperature measurement and sampling position;

[0038] S8. Post temperature measurement: The process is the same as that of pre-temperature measurement and sampling.

[0039] Furthermore, the method also includes abnormal state handling: The entire KR desulfurization process design has many process links, a wide range of signals and programs; therefore, abnormal state handling must be considered;

[0040] First, complex interlock conditions are designed for the connection between each operation link. Before the system runs automatically, program self-check is first carried out. After all interlock conditions are met, it is considered to have the conditions for automatic KR desulfurization; after the automatic process starts, before entering the next operation link, the program also conducts interlock condition self-check. If the entry conditions are not met, the current production link will stop;

[0041] Second, time protection is set between each operation link of the system. Under normal circumstances, the time taken to complete this step is relatively fixed. If it exceeds the fixed time, it means that abnormal conditions may occur within the state of this step. At this time, the automatic program makes an interruption handling;

[0042] Finally, the maximum manual authority is given. If the operator believes that there is a deviation in the execution of this step, this step can be interrupted and manually processed; after an abnormal interruption, according to the time situation, the operator can choose to continue the automatic process or switch to manual processing; after the processing of this heat is completed, the abnormal interruption situation will also be restored accordingly.

[0043] Furthermore, the method also includes monitoring: All process treatment steps are displayed on the operation screen. Normal processing steps and abnormally interrupted steps are specially marked on the operation screen, and there is an obvious prompt sound when the processing is interrupted.

[0044] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0045] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for fully automatic desulfurization of hot metal pretreatment, characterized in that, It includes the following steps: S1. The trolley moves to the temperature measurement and sampling position: After the hot metal ladle is seated, the operator confirms that the overhead crane has been unhooked. The operator clicks to start the processing, and the trolley automatically runs to the temperature measurement and sampling position; S2. Pre-temperature measurement: According to the molten iron liquid level height calculated by the pretreatment model, the insertion depth and residence time of the temperature measurement and sampling gun are automatically set. After the trolley moves to the temperature measurement and sampling position, the temperature measurement gun automatically starts to perform temperature measurement and sampling; S3. The trolley moves to the stirring and slag skimming position: After the temperature measurement is completed, the trolley automatically starts and stops at the stirring and slag skimming position; S4. Pre-slag skimming: After the trolley is in place, the automatic slag skimming system issues an instruction to start tilting the hot metal ladle and perform slag skimming. When the industrial vision system determines that the exposed area of the molten iron meets the process requirements, the pre-slag skimming ends and the hot metal ladle is reset; S5. Stirring desulfurization: According to the molten iron liquid level height, desulfurizer input weight, stirring time, stirring paddle insertion depth, medium and high-speed stirring speed, etc. calculated by the pretreatment model; after the hot metal ladle is reset, the mechanical stirring system automatically starts to perform stirring desulfurization operations; S6. Post-slag skimming: The process is the same as pre-slag skimming. After each automatic post-slag skimming by the automatic slag skimming system ends, the slag pot automatic detection function is started. According to the volume of the slag in the slag pot and the slag pile shape, the effective space in the slag pot is identified, and it is judged whether the effective space can meet the slag skimming requirements of the next furnace. If the effective space cannot meet the slag skimming requirements of the next furnace, a slag pot replacement signal is triggered to prompt for slag pot replacement operations; S7. The trolley automatically runs to the temperature measurement and sampling position at the car position: After the post-slag skimming ends and the hot metal ladle is reset, the trolley automatically starts and stops at the temperature measurement and sampling position; S8. Post-temperature measurement: The process is the same as pre-temperature measurement and sampling.

2. The method for fully automatic desulfurization of hot metal pretreatment according to claim 1, characterized in that: The method also includes abnormal state handling: The entire KR desulfurization process design has many process links, a wide range of signals and programs; therefore, abnormal state handling must be considered; First of all, complex interlock conditions are designed for the connection between each operation link. Before the system automatically runs, program self-check is first carried out. After all the interlock conditions are met, it is considered to have the conditions for automatic KR desulfurization; after the automatic processing starts, before entering the next operation link, the program also performs interlock condition self-check. If the entry conditions are not met, it stops at the current production link; Secondly, time protection is set between each operation link of the system. Under normal circumstances, the time taken to complete this step is relatively fixed. If it exceeds the fixed time, it means that abnormal conditions may occur within the state of this step. At this time, the automatic program makes an interruption handling; Finally, the maximum manual authority is given. If the operator believes that there is a deviation in the execution of this step, this step can be interrupted and manually processed; after an abnormal interruption, according to the time situation, you can choose to continue the automatic process or switch to manual processing; after the processing of this heat is completed, the abnormal interruption situation is also restored accordingly.

3. A method for fully automatic desulfurization of hot metal pretreatment according to claim 1, characterized in that: The method also includes monitoring: All process treatment steps are displayed on the operation screen. The normal processing steps and the abnormally interrupted steps have special marks on the operation screen, and there is an obvious prompt sound when the processing is interrupted.

Images