An automatic control method, terminal device and medium for the steel tapping process of a steelmaking converter

Abstract

The present invention relates to an automatic control method, terminal device and medium for the tapping process of a steelmaking converter. The method includes: dividing the tapping process of the converter into three stages; constructing a reference tapping time distribution table corresponding to different tapping time ranges; setting that during the period from when a new tapping nozzle is installed to when it is replaced, the preset total tapping time for the current heat is the total tapping time actually measured for the previous heat; selecting the corresponding distribution table according to the preset total tapping time, calculating the time difference between the former and the total tapping time calculated by each step of the latter, and distributing the time difference to the second stage and the third stage of the tapping process. Adding the difference distribution result to the residence time corresponding to each tapping angle on the distribution table as the finally preset residence time for each tapping angle of the converter; controlling the current tapping process according to the finally preset residence time for each tapping angle of the converter. The present invention greatly reduces the number of tapping time distribution tables that need to be set during commissioning, and greatly simplifies the on-site commissioning work.

Description

Technical Field

[0001] The present invention relates to the field of converter steelmaking, and particularly to an automatic control method, a terminal device and a medium for the steel tapping process of a steelmaking converter. Background Art

[0002] As Figure 1 shown, achieving a good converter automatic steel tapping function is an important part of realizing the goal of intelligent steelmaking in a converter. In the traditional automatic steel tapping method, the timing start point of the total steel tapping time for each furnace usually starts when the converter tilt angle dips below a certain steel tapping angle (for example, -50 degrees), and the timing end point of the total steel tapping time for each furnace is usually when the converter tilt angle inclines above a certain steel tapping angle (for example, -50 degrees). The actual total steel tapping time for each furnace cannot be accurately and automatically measured.

[0003] In the traditional converter automatic steel tapping method, the total steel tapping time for this furnace is usually set according to the number of furnace times the new steel tapping nozzle has been used. This setting method has no online production data for real-time feedback, and there are many uncontrollable factors (such as the specifications and materials of the steel tapping nozzle in this batch have changed greatly compared with the commissioning, or the total steel water volume of this batch of furnaces has changed greatly compared with the commissioning, etc.). It is difficult to always accurately and safely estimate and set the total steel tapping time for this furnace, resulting in a relatively high failure rate of automatic steel tapping.

[0004] In the traditional converter automatic steel tapping method, the pre-automatic allocation of each steel tapping step time generally adopts the enumeration approximation allocation method, that is, from the shortest total steel tapping time to the longest total steel tapping time, a steel tapping time allocation table is set at each time interval to determine the steel tapping residence time corresponding to each steel tapping angle near the total steel tapping time. It has the following disadvantages: the steel tapping time allocation table is an approximation of the actual total steel tapping time near the total steel tapping time represented by the table, which is not convenient for fully and accurately reflecting the steel tapping time allocation actually required; the number of steel tapping time allocation tables that need to be set is relatively large, which is not convenient for simplifying the on-site commissioning work. Summary of the Invention

[0005] In order to solve the above problems, the present invention proposes an automatic control method, a terminal device and a medium for the steel tapping process of a steelmaking converter.

[0006] The specific solutions are as follows:

[0007] An automatic control method for the steel tapping process of a steelmaking converter includes the following steps:

[0008] Dividing the steel tapping process of the converter into three stages, and each stage includes several steps;

[0009] Constructing a reference steel tapping time allocation table corresponding to different total steel tapping time ranges, and each reference steel tapping time allocation table includes the steel tapping angles corresponding to each step in the steel tapping stage and the residence time of the converter at this steel tapping angle;

[0010] During the period from the installation of the new tapping hole to its replacement, the preset total tapping time for the current heat is set to the actual measured total tapping time of the previous heat.

[0011] Select the corresponding reference tapping time distribution table according to the preset total tapping time of the current heat.

[0012] Calculate the time difference between the preset total tapping time of the current heat and the total tapping time calculated for each step in the reference tapping time distribution table. Allocate the time difference to the second and third stages of the tapping process according to a preset ratio, and within each stage, allocate it among all tapping angles according to the proportion of the residence time corresponding to each tapping angle in the reference tapping time distribution table. Add the difference allocation result to the residence time corresponding to each tapping angle in the reference tapping time distribution table as the finally preset residence time for each tapping angle of the converter.

[0013] Control the current tapping process according to the finally preset residence time for each tapping angle of the converter.

[0014] Further, in the three stages of the tapping process, the start time of the first stage is determined by the automatic tapping start signal, and the end time is determined by the converter angle corresponding to when the molten steel in the converter is between the tapping hole and the converter mouth; the start time of the second stage is the end time of the first stage, and the end time is determined by the converter angle corresponding to when the molten steel in the converter first reaches the edge of the converter mouth; the start time of the third stage is the end time of the second stage, and the end time is the end point of the actual total tapping time.

[0015] Further, in the calculation of the actual total tapping time for each heat, the time when the steel flow is seen flowing out of the tapping hole by the photographing device is used as the starting point of timing, and the arrival time of the earlier signal among the signal returned by the slide gate slag stopping system indicating that the slag stopping slide gate is closed or the signal indicating that the converter starts to return to the zero-tilt angle is used as the end point of timing. The time difference between the end point and the starting point of timing is used as the actually measured total tapping time for each heat.

[0016] Further, in the reference tapping time distribution table, the residence time of the tapping angle of the converter in the first stage is set to 0, and the tapping angle of the converter in the second stage is allocated less residence time compared to the tapping angle of the converter in the third stage.

[0017] Further, when allocating the time difference, in the preset ratio, the tapping angles in the second stage account for a smaller part, and the tapping angles in the third stage account for a larger part.

[0018] An automatic control terminal device for the tapping process of a steelmaking converter, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method of the present invention are implemented.

[0019] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method of the present invention are implemented.

[0020] Adopting the above technical solution, compared with the traditional method of automatically tapping the converter, the present invention can more accurately and automatically measure the actual total tapping time of the previous heat; can more accurately and safely automatically set the total tapping time of the current heat; at the same time, by using the adaptive allocation method based on the reference table instead of the traditional enumeration approximation allocation method to automatically allocate the total tapping time of the current heat, it can more accurately reflect the tapping time allocation actually required during the tapping process of the current heat and greatly reduce the number of tapping time allocation tables that need to be set during the commissioning period, greatly simplifying the on-site commissioning work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure shows a schematic diagram of the tapping process.

[0022] Figure 2 The figure shows a flowchart of Embodiment 1 of the present invention.

[0023] Figure 3 The figure shows a schematic diagram of the start time and end time of the first stage of tapping in Embodiment 1 of the present invention.

[0024] Figure 4 The figure shows a schematic diagram of the start time and end time of the second stage of tapping in Embodiment 1 of the present invention.

[0025] Figure 5 The figure shows a schematic diagram of the start time and end time of the third stage of tapping in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To further illustrate each embodiment, the present invention provides drawings. These drawings are a part of the disclosure of the present invention, mainly used to illustrate the embodiments, and can be combined with the relevant descriptions in the specification to explain the operation principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention.

[0027] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0028] Embodiment 1:

[0029] The embodiment of the present invention provides an automatic control method for the tapping process of a steelmaking converter, as Figure 2 shown, the method includes the following steps:

[0030] Step 1: Divide the tapping process of the converter into three stages, and each stage includes several steps.

[0031] As Figure 1 shown, according to the characteristics of the converter furnace type structure, the entire tapping process in this embodiment can be divided into the following three stages:

[0032] As Figure 3 shown, the first stage starts when the automatic tapping is initiated and ends when the molten steel just submerges the tapping hole at a certain angle. The start signal of the first stage is determined by the automatic tapping start signal, and the end signal is determined by the actual tilting angle of the converter corresponding to when the molten steel is between the tapping hole and the furnace mouth based on the furnace type structure. In one embodiment, the converter angle corresponding to when the molten steel just flows out of the tapping hole and the converter angle corresponding to when the molten steel first reaches the edge of the converter furnace mouth can be recorded, and then the average value of these two converter angles is taken as the end signal. For example, taking a converter negative 74-degree inclination (the converter is upright at 0 degrees and inclined to the left as negative degrees), that is, when the converter rotates to negative 74 degrees, it is determined that the first stage ends.

[0033] As Figure 4 shown, the second stage starts when the first stage ends and ends when the molten steel first reaches the edge of the converter furnace mouth. The end time of the second stage is determined by the converter angle corresponding to when the molten steel in the converter first reaches the edge of the converter furnace mouth. For example, when the converter rotates to negative 89 degrees, it is determined that the second stage ends.

[0034] As Figure 5 shown, the third stage starts when the second stage ends and ends when the tapping ends. The end time of the third stage is the timing end point of the actual total tapping time.

[0035] In this embodiment, for the converter tapping angle range corresponding to each stage, it is evenly divided into multiple steps, such as being divided at an interval of 1.5 degrees of converter tapping angle.

[0036] Step 2: Construct a reference tapping time distribution table corresponding to different total tapping time ranges. Each reference tapping time distribution table includes the tapping angles corresponding to each step of the tapping stage and the residence time of the converter at this tapping angle.

[0037] The reference tapping time distribution table is not the directly used tapping time distribution table, but a rule table that describes how to generate the actually used tapping time distribution table. In this embodiment, it is set that from the shortest total tapping time to the longest total tapping time, a reference tapping time distribution table is constructed at each time interval. Usually, it is sufficient to set 3 reference tapping time distribution tables from the shortest total tapping time to the longest total tapping time. For example, the scope of action of the first reference table is [the shortest total tapping time, the shortest total tapping time + (the longest total tapping time - the shortest total tapping time) / 3); the scope of action of the second reference table is [the shortest total tapping time + (the longest total tapping time - the shortest total tapping time) / 3, the shortest total tapping time + (the longest total tapping time - the shortest total tapping time)*2 / 3); the scope of action of the third reference table is [the shortest total tapping time + (the longest total tapping time - the shortest total tapping time)*2 / 3, the longest total tapping time].

[0038] In the reference tapping time distribution table, for the tapping angles in the first stage, since they are very safe tapping angles, no tapping residence time needs to be allocated to them, that is, the corresponding tapping residence time can be set to 0. For the tapping angles in the second stage, which are relatively safe tapping angles, less tapping time can be allocated to the tapping angles in this stage. For the tapping angles in the third stage, which are the key controlled tapping angles, more tapping time can be allocated to the tapping angles in this stage.

[0039] Step 3: During the period from when the new tapping hole is installed to when it is replaced, the preset total tapping time of the current heat is set to the total tapping time actually measured in the previous heat.

[0040] In the calculation of the actual total tapping time of each heat, the time when the steel flow is seen flowing out of the tapping hole through the shooting device (camera) is used as the timing start point, and the arrival time of the earlier signal among the signal that the slag blocking slide plate has closed returned by the slide plate slag blocking system or the signal that the converter starts to return to the zero tilting angle is used as the timing end point. The time difference between the timing end point and the timing start point is used as the actually measured total tapping time of each heat.

[0041] Under normal production conditions, the difference in the total molten steel volume between adjacent heats before tapping generally varies within 20 tons, and the impact of the difference in the total molten steel volume of each heat on the total tapping time of each heat is limited. The main factor affecting the difference in the tapping time of each heat is that after replacing the new tapping nozzle for the converter each time, as the number of tapping heats gradually increases, the number of times the tapping nozzle is used gradually increases, and the tapping nozzle is eroded and enlarged by the molten steel flow, resulting in a gradual increase in the tapping volume per unit time. Under the condition of limited difference in the total molten steel volume, the tapping time gradually decreases. For example, a certain factory replaces the new tapping nozzle for the converter every about 200 heats. Under the condition of limited difference in the total molten steel volume, the tapping time when the tapping nozzle is just replaced is about 8 minutes, and the tapping time when the tapping nozzle is about to be replaced is about 4.5 minutes, and the overall trend of the tapping time of each heat conforms to the trend of gradually decreasing as the number of tapping heats gradually increases.

[0042] Based on the above analysis, during the period from when a new tapping nozzle is installed to when it is replaced, under the condition of limited difference in the total molten steel volume of each heat, the overall trend of the tapping time of each heat is to gradually decrease as the number of tapping heats gradually increases. Furthermore, the total tapping times of two adjacent heats are similar, so the total tapping time of the previous heat can be used as a basis for setting the total tapping time of this heat.

[0043] The following analyzes the advantages and disadvantages of setting the total tapping time of this heat in two cases:

[0044] The first is to set the tapping time of this heat according to the number of heats the new tapping nozzle has been used. This setting method has no real-time feedback from on-line production data and has many uncontrollable factors (such as the tapping nozzle specifications and materials of this batch have changed significantly compared with those during commissioning, or the total molten steel volume of this batch of heats has changed significantly compared with that during commissioning, etc.), so it is not the optimal method.

[0045] The second is to set the tapping time of this heat to be equal to that of the previous heat. Based on the above analysis, during the period from when a new tapping nozzle is installed to when it is replaced, under the condition of limited difference in the total molten steel volume of each heat, the overall trend of the tapping time of each heat is to gradually decrease as the number of tapping heats gradually increases. Furthermore, the total tapping times of two adjacent heats are similar, so the total tapping time of the previous heat can be used as a basis for setting the total tapping time of this heat. This setting method has real-time feedback from on-line production data, and the set total tapping time will be adjusted automatically according to the actual production conditions, which has more advantages.

[0046] Step Four: Select the corresponding reference tapping time distribution table according to the preset total tapping time of the current heat.

[0047] After obtaining the preset total tapping time of the current heat, select the baseline tapping time distribution table required for the current heat according to the corresponding tapping time range. If it is within the range of [shortest total tapping time + (longest total tapping time - shortest total tapping time) / 3, shortest total tapping time + (longest total tapping time - shortest total tapping time)*2 / 3), then the current heat selects the second baseline tapping time distribution table for subsequent calculations.

[0048] Step Five: Calculate the time difference between the preset total tapping time of the current heat and the total tapping time calculated for each step of the baseline tapping time distribution table. Allocate the time difference to the second and third stages of the tapping process according to a preset ratio, and allocate it among all tapping angles within each stage according to the proportion of the residence time corresponding to each tapping angle on the baseline tapping time distribution table. Add the difference allocation result to the residence time corresponding to each tapping angle on the baseline tapping time distribution table as the final preset residence time for each tapping angle of the converter.

[0049] The total tapping time calculated for each step of the baseline tapping time distribution table is the sum of the residence times corresponding to all tapping angles of this baseline tapping time distribution table.

[0050] Based on the characteristics of the second and third stages, the preset ratio in this embodiment is that the second stage accounts for a smaller part and the third stage accounts for a larger part. For example, the second stage accounts for 20% and the third stage accounts for 80%.

[0051] Step Six: Control the current tapping process according to the final preset residence time for each tapping angle of the converter.

[0052] The embodiment of the present invention can automatically and accurately measure the actual total tapping time of the previous heat of the converter, and automatically set the preset total tapping time of this heat according to the actually measured total tapping time of the previous heat. Then, the preset total tapping time of this heat is automatically allocated to the residence times of each tapping angle of the converter of this heat by using the adaptive allocation method based on the baseline table. Compared with the traditional automatic tapping method, the actual application of the method proposed in this embodiment in a certain factory shows that this method can more accurately automatically measure the actual total tapping time of the previous heat; can more accurately and safely automatically set the total tapping time of this heat; at the same time, by using the adaptive allocation method based on the baseline table instead of the traditional enumeration approximation allocation method to automatically allocate the total tapping time of this heat, it can more accurately reflect the tapping time distribution actually required during the tapping process of this heat and greatly reduce the number of tapping time distribution tables that need to be set during the commissioning period, greatly simplifying the on-site commissioning work.

[0053] Embodiment Two:

[0054] The present invention also provides an automatic control terminal device for the steel tapping process of a steelmaking converter, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above method in Embodiment 1 of the present invention are implemented.

[0055] Further, as an executable solution, the automatic control terminal device for the steel tapping process of the steelmaking converter may be a computing device such as a desktop computer. The automatic control terminal device for the steel tapping process of the steelmaking converter may include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the above composition structure of the automatic control terminal device for the steel tapping process of the steelmaking converter is only an example of the automatic control terminal device for the steel tapping process of the steelmaking converter, and does not constitute a limitation on the automatic control terminal device for the steel tapping process of the steelmaking converter. It may include more or fewer components than the above, or combine some components, or different components. For example, the automatic control terminal device for the steel tapping process of the steelmaking converter may further include input / output devices, network access devices, a bus, etc. Embodiments of the present invention do not make limitations in this regard.

[0056] Further, as an executable solution, the processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The processor is the control center of the automatic control terminal device for the steel tapping process of the steelmaking converter, and connects various parts of the entire automatic control terminal device for the steel tapping process of the steelmaking converter through various interfaces and lines.

[0057] The memory can be used to store the computer programs and / or modules. By running or executing the computer programs and / or modules stored in the memory, and by invoking the data stored in the memory, the processor realizes various functions of the automatic control terminal device for the tapping process of the steelmaking converter. The memory may mainly include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the calculation program, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0058] The present invention also provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the method in the above embodiments of the present invention are realized.

[0059] If the modules / units integrated in the automatic control terminal device for the tapping process of the steelmaking converter are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above embodiments of the present invention, it can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the various steps of the method in the above embodiments can be realized. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, an executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disc, a computer memory, a read-only memory (ROM), a random access memory (RAM), and a software distribution medium, etc.

[0060] Although the present invention is specifically shown and described in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all of them fall within the protection scope of the present invention.

Claims

1. An automatic control method for the tapping process of a steelmaking converter, characterized in that, It includes the following steps: The steel tapping process of the converter is divided into three stages. Among them, the start time of the first stage is determined by the automatic steel tapping start signal, and the end time is determined by the converter angle corresponding to when the molten steel in the converter is between the tapping hole and the converter mouth; the start time of the second stage is the end time of the first stage, and the end time is determined by the converter angle corresponding to when the molten steel in the converter first reaches the edge of the converter mouth; the start time of the third stage is the end time of the second stage, and the end time is the end point of the timing of the actual total steel tapping time; each stage includes several steps; Construct a reference steel tapping time distribution table corresponding to different total steel tapping time ranges. Each reference steel tapping time distribution table includes the tapping angles corresponding to the steps of the steel tapping stage and the residence time of the converter at this tapping angle; During the period from when the new tapping hole is installed to when it is replaced, the preset total steel tapping time of the current heat is the total steel tapping time actually measured in the previous heat; Select the corresponding reference steel tapping time distribution table according to the preset total steel tapping time of the current heat; Calculate the time difference between the preset total steel tapping time of the current heat and the total steel tapping time calculated by each step of the reference steel tapping time distribution table. Allocate the time difference to the second and third stages of the steel tapping process according to a preset ratio, and allocate it according to the proportion of the residence time corresponding to each tapping angle on the reference steel tapping time distribution table among all the tapping angles in each stage. Add the difference allocation result to the residence time corresponding to each tapping angle on the reference steel tapping time distribution table as the finally preset residence time of each tapping angle of the converter; Control the current steel tapping process according to the finally preset residence time of each tapping angle of the converter.

2. The automatic control method for the tapping process of a steelmaking converter according to claim 1, characterized in that: In the calculation of the actual total steel tapping time of each heat, the time when the steel flow flows out of the tapping hole is taken as the timing start point through the photographing device, and the arrival time of the earlier signal among the signal that the slag blocking slide plate system returns that the slag blocking slide plate has been closed or the signal that the converter starts to return to the zero-tilt angle is taken as the timing end point. The time difference between the timing end point and the timing start point is taken as the actual measured total steel tapping time of each heat.

3. The automatic control method for tapping process of steelmaking converter according to claim 1, characterized in that: In the reference steel tapping time distribution table, the residence time of the tapping angle of the converter in the first stage is set to 0, and the tapping angle of the converter in the second stage is allocated less residence time compared with the tapping angle of the converter in the third stage.

4. The automatic control method for the tapping process of a steelmaking converter according to claim 1, characterized in that: When allocating the time difference, the preset ratio has a smaller proportion for the tapping angles in the second stage and a larger proportion for the tapping angles in the third stage.

5. An automatic control terminal device for the tapping process of a steelmaking converter, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of the method described in any one of claims 1 to 4.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, it implements the steps of the method described in any one of claims 1 to 4.

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