A production scheduling method and system based on steelmaking mechanism

Abstract

The application discloses a production scheduling method and system based on a steelmaking mechanism, which comprises the following steps: matching calculation is performed on the converter and continuous casting capacity in the steelmaking process, so that the converter production capacity guarantees the continuous production of the continuous casting; after the maximum continuous casting furnace number of the day is obtained according to the capacity matching calculation, the billet characteristics are arranged to the specified continuous casting machine for production; the start processing time of the heat in the refining furnace and the converter is calculated forward according to the start processing time of the continuous casting; under the premise that the continuous casting is unchanged, the converter and the refining schedule are dynamically adjusted in the positive direction. The originally relatively independent production planning of the steelmaking-refining-continuous casting process is changed into integrated planning of the whole production line, and is dynamically optimized according to various restrictions in the production site. The production scheduling is realized from manual to automatic and from local to global, so that the balance of logistics, the on-time delivery rate of orders and the synchronization of the whole production supply chain are improved, and the reasonable control of the whole production line capacity and the efficient use of resources are realized.

Description

Technical Field

[0001] This application relates to the field of metallurgical automation technology, specifically to a production scheduling method and system based on steelmaking mechanisms. Background Technology

[0002] Iron and steel smelting is a general term for the metallurgical processes of steel and iron. Modern ironmaking largely utilizes blast furnaces, with some employing direct reduction ironmaking and electric arc furnaces. Steelmaking primarily uses pig iron produced in blast furnaces, sponge iron produced through direct reduction ironmaking, and scrap steel as raw materials, refining them into steel using various methods. The basic production process involves refining iron ore into pig iron in a blast furnace, then using the pig iron as raw material to refine it into steel using different methods, and finally casting it into steel ingots or continuously cast billets.

[0003] To ensure the smooth operation of steel smelting, the steel smelting process is divided into many scheduling procedures. Currently, most steel plants still use manual scheduling for planning and production organization, which makes it difficult to guarantee the quality of work plans and the balance of logistics between procedures. The plans are slow to be issued, have poor predictability, and low optimization, making it difficult to adapt to complex, efficient, and multi-combination production organization.

[0004] Therefore, there is an urgent need for a systematic and standardized production scheduling algorithm to automate and intelligentize the scheduling process. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, this application proposes the following technical solution: In a first aspect, embodiments of this application provide a production scheduling method based on steelmaking mechanisms, including: Matching calculations are performed on the converter and continuous casting capacities during the steelmaking process to ensure that the converter production volume guarantees continuous continuous casting production. After calculating the maximum number of continuous casting furnaces for the day based on capacity matching, production is arranged to be carried out on designated continuous casting machines according to the characteristics of steel billets. Based on the start time of the continuous casting furnace, the start time of the refining furnace and converter for that furnace can be calculated backwards. Under the premise of keeping continuous casting unchanged, the converter and refining schedules are dynamically adjusted in the forward process.

[0006] In one possible implementation, the matching calculation of converter and continuous casting capacity in the steelmaking process includes: Where: T is the time period to be scheduled, m is the number of the casting machine in use, tm is the average consumption rate of the casting machine per furnace, n is the number of the converter in use, tn is the average production rate of the converter per furnace, Tn is the converter production time consumed due to other reasons (such as process conversion), and Tm is the continuous casting production time consumed due to other reasons.

[0007] In one possible implementation, when billet characteristics are assigned to a designated continuous casting machine for production, if multiple continuous casting machines are simultaneously producing the same type of billet, the billet is evenly distributed among the continuous casting machines until the tundish reaches the end of its service life.

[0008] In one possible implementation, the step of extrapolating the start time of the continuous casting heat in the refining furnace and converter from the start time of the continuous casting heat includes: Based on the determination of the continuous casting furnace batch, the converter furnace schedule is arranged according to the principles of time priority and proximity, with priority given to freeing up the default refining process time. Then select a suitable refining furnace base. The start time for processing is determined based on the start time of continuous casting and the refining market. If the converter time is delayed, the time of each process needs to be dynamically adjusted backward.

[0009] In one possible implementation, if the converter time is delayed, the time of each process needs to be dynamically adjusted backward, including: shortening the converter time, shortening the logistics time, shortening the refining time, and reducing the casting speed of continuous casting in sequence. There is an upper limit to the time reduction of each process. If the continuous casting start time still cannot be met, that is, the start time of continuous casting is later than the latest start time, an alarm for the risk of casting interruption is given, and the casting speed is reduced or the casting is interrupted according to the user's choice.

[0010] In one possible implementation, under the premise that continuous casting remains unchanged, the converter and refining schedules are dynamically adjusted in the forward process, including: first adjusting the converter time, then adjusting the logistics and refining time, and finally adjusting the continuous casting time. If the continuous casting requirements are still not met, casting is stopped. The adjustment time of each process is not adjusted within a fixed threshold.

[0011] In one possible implementation, if the converter's production capacity is sufficient, the converter can be allowed to start production in advance and steel pressing operations can be arranged to make up for the foreseeable shortage of steel supply in the future. Alternatively, if the converter's production capacity is insufficient during the scheduling process, or if the converter scheduling is delayed due to the ladle not arriving or the molten iron and scrap steel not arriving, it is necessary to reduce the converter time, logistics time, refining time, or reduce the continuous casting speed.

[0012] In one possible implementation, if the converter finishes smelting ahead of schedule and enters the refining stage, the refining process can allow the ladle to hold the steel for a period of time; or, if the converter is delayed, the refining process time and logistics time can be accelerated, or the continuous casting speed can be reduced in advance.

[0013] In one possible implementation, continuous casting is carried out strictly according to the schedule. If the production time of the preceding process is delayed, the casting speed of the previous furnace is reduced to make up for the time delay.

[0014] Secondly, embodiments of this application provide a production scheduling system based on steelmaking mechanisms, including: The matching calculation module is used to perform matching calculations between converter and continuous casting capacity during the steelmaking process, so that converter production can guarantee continuous continuous casting production. The continuous casting machine allocation module is used to calculate the maximum number of continuous casting furnaces for the day based on capacity matching, and then arrange the steel billet to the designated continuous casting machine for production according to the characteristics of the billet. The converter refining production scheduling module is used to calculate the start time of the refining furnace and converter based on the start time of the continuous casting furnace. The dynamic adjustment module is used to dynamically adjust the converter and refining schedules in the forward process while keeping the continuous casting process unchanged.

[0015] In this embodiment, the previously relatively independent production planning of the steelmaking-refining-continuous casting processes is transformed into an integrated production line plan, dynamically optimized based on various constraints at the production site. This achieves a shift from manual to automated production scheduling, and from local to global scheduling, thereby balancing logistics, improving on-time order delivery rates and the synchronization of the entire production supply chain, and realizing reasonable control of the entire production line's capacity and efficient utilization of resources. Attached Figure Description

[0016] Figure 1 A schematic flowchart illustrating a production scheduling method based on steelmaking mechanism provided in this application embodiment; Figure 2 This is a schematic diagram of a production scheduling system based on steelmaking mechanism, provided as an embodiment of this application. Detailed Implementation

[0017] The present solution will now be described in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 A flowchart illustrating a production scheduling method based on steelmaking mechanisms, provided as an embodiment of this application, is shown below. Figure 1 The production scheduling method based on steelmaking mechanism in this embodiment includes: S101 performs matching calculations for the converter and continuous casting capacities during the steelmaking process to ensure that the converter production volume guarantees continuous continuous casting production.

[0019] Capacity matching calculation is to ensure that the converter's production can keep up with the continuous casting's production within a certain period of time (default one day), thus ensuring continuous continuous casting production.

[0020] The calculation formula is as follows: Where: T is the time period to be scheduled, m is the number of the casting machine in use, tm is the average consumption rate of the casting machine per furnace, n is the number of the converter in use, tn is the average production rate of the converter per furnace, Tn is the converter production time consumed due to other reasons (such as process conversion), and Tm is the continuous casting production time consumed due to other reasons.

[0021] S102, after calculating the maximum number of continuous casting furnaces for the day based on capacity matching, arranges production to designated continuous casting machines according to the characteristics of steel billets.

[0022] After calculating the maximum number of continuous casting furnaces per day based on capacity matching, production is scheduled to take place on designated continuous casting machines according to the characteristics of the steel billets. If multiple continuous casting machines are producing the same type of steel billet simultaneously, the billets are evenly distributed among the machines until the tundish reaches the end of its service life.

[0023] S103, based on the start time of the continuous casting heat, calculate the start time of the refining furnace and converter for that heat.

[0024] Based on the start time of the continuous casting heat, the start time of the refining furnace and converter for that heat is calculated backward. After determining the continuous casting heat, the converter furnace scheduling is prioritized according to the time priority and proximity principle, leaving the default refining process time (LF or RH or LF-RH) free. Then, the appropriate refining furnace is selected. This start time is the latest start time.

[0025] If the converter time is delayed, the times of each process need to be dynamically adjusted to expedite completion. The adjustment methods are as follows: shorten converter time, shorten logistics time, shorten refining time, and reduce casting speed in continuous casting. There is an upper limit to the time reduction for each process. If this still cannot be met, i.e., the earliest start time of continuous casting (determined by the preceding process) is later than the latest start time (determined by the number of casting cycles), a casting interruption risk alarm will be issued, and casting speed reduction or casting interruption will be implemented according to the user's choice.

[0026] S104, under the premise of continuous casting remaining unchanged, dynamically adjusts the converter and refining schedule in the forward process.

[0027] Under the premise of keeping continuous casting unchanged, adjust the converter and refining processes, and follow the forward process sequence for scheduling adjustments. That is, first adjust the converter time, then adjust the logistics and refining times, and finally adjust the continuous casting time. If the requirements are still not met, stop casting. No adjustments will be made if the adjustment time for each process is within a fixed threshold (5 minutes).

[0028] 1) Converter: Advance: If the converter's production capacity is sufficient, it can be allowed to start production ahead of schedule to arrange steel pressing operations, making up for any foreseeable shortages in steel supply later on.

[0029] Delay: During the scheduling process, if there is insufficient converter production capacity, or if the converter scheduling is delayed due to the failure of the ladle or the failure of the molten iron and scrap steel to arrive, it is necessary to reduce the converter time, logistics time, refining time or reduce the continuous casting speed.

[0030] 2) Refining: Advance: The converter smelting is completed ahead of schedule, and the refining process begins. The refining process allows the ladle to hold the steel for a period of time.

[0031] Delay: If delayed, it is necessary to speed up the refining process, logistics time, or reduce the casting speed of continuous casting in advance.

[0032] 3) Continuous casting: Continuous casting is carried out strictly according to the schedule. If the production time of the preceding process is delayed, the casting speed of the previous furnace can be reduced to make up for it.

[0033] This application transforms the previously relatively independent production planning of the steelmaking-refining-continuous casting processes into an integrated production line plan, dynamically optimizing it based on various constraints at the production site. It achieves a shift from manual to automated, and from localized to global production scheduling, thereby balancing logistics, improving on-time order delivery rates, and ensuring the synchronization of the entire production supply chain. This enables rational control of the entire production line's capacity and efficient resource utilization. Key functions include production planning management, secondary casting management, work plan creation, and work plan rescheduling, achieving unified coordination, control, and scheduling of material flow, information flow, and energy flow. This systematically enhances steelmaking capacity and comprehensively improves the level of intelligent management.

[0034] This invention patent achieves a plan execution rate of ≥90% and an on-time rate of ≥90%, effectively controls the production rhythm of each process, enhances the linkage capability of each process, scientifically allocates cross-operation tasks of each crane, systematically improves steelmaking capacity, achieves stable and high steelmaking output, improves the scientific nature of production planning, reduces the frequency of cross-supply operations, and reduces the labor intensity of employees.

[0035] Corresponding to the production scheduling method based on steelmaking mechanism provided in the above embodiments, this application also provides a production scheduling system based on steelmaking mechanism.

[0036] See Figure 2 The production scheduling system 20 based on the steelmaking mechanism in this embodiment includes: The matching calculation module 201 is used to perform matching calculations on the converter and continuous casting capacity during the steelmaking process, so that the converter production can guarantee the continuous production of continuous casting. The continuous casting machine allocation module 202 is used to calculate the maximum number of continuous casting furnaces for the day based on the capacity matching, and then arrange the steel billet to the designated continuous casting machine for production according to the characteristics of the billet. The converter refining production scheduling module 203 is used to calculate the start time of the refining furnace and converter based on the start time of the continuous casting furnace. The dynamic adjustment module 204 is used to dynamically adjust the converter and refining schedule in the forward process while keeping the continuous casting process unchanged.

[0037] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0038] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A production scheduling method based on steelmaking mechanisms, characterized in that, include: Matching calculations are performed on the converter and continuous casting capacities during the steelmaking process to ensure that the converter production volume guarantees continuous continuous casting production. The matching calculation of converter and continuous casting capacity in the steelmaking process includes: in: For the time period to be scheduled, For the number of casting machines in use, This represents the average consumption rate per furnace of the casting machine. The converter number currently in use. The average production speed of one converter furnace. For converter production time consumed due to other reasons, This refers to continuous casting production time consumed for other reasons; After calculating the maximum number of continuous casting furnaces for the day based on capacity matching, production is arranged to be carried out on designated continuous casting machines according to the characteristics of steel billets. Based on the start time of the continuous casting heat, the start time of the refining furnace and converter for that heat is calculated backwards, including: Based on the determination of the continuous casting furnace batch, the converter furnace schedule is arranged according to the principles of time priority and proximity, with priority given to freeing up the default refining process time. Then select a suitable refining furnace base. The start time for processing is determined based on the start time of continuous casting and the refining time in the refining furnace. If the converter time is delayed, the time of each process needs to be dynamically adjusted backward. Under the premise of keeping continuous casting unchanged, the converter and refining schedules are dynamically adjusted in the forward process.

2. The production scheduling method based on steelmaking mechanism according to claim 1, characterized in that, When steel billet characteristics are assigned to a designated continuous casting machine for production, if multiple continuous casting machines are simultaneously producing the same type of steel billet, the billet is evenly distributed among the continuous casting machines until the tundish reaches the end of its service life.

3. The production scheduling method based on steelmaking mechanism according to claim 1, characterized in that, If the converter time is delayed, the time of each process needs to be dynamically adjusted, including: shortening the converter time, shortening the logistics time, shortening the refining time, and reducing the casting speed in the continuous casting process. There is an upper limit to the time that each process can be shortened. If the continuous casting start time still cannot be met, that is, the start time of continuous casting is later than the latest start time, a casting interruption risk alarm will be issued, and the casting speed will be reduced or the casting will be interrupted according to the user's choice.

4. The production scheduling method based on steelmaking mechanism according to claim 1, characterized in that, Under the premise that continuous casting remains unchanged, the converter and refining schedules are dynamically adjusted in the forward process, including: first adjusting the converter time, then adjusting the logistics and refining time, and finally adjusting the continuous casting time. If the continuous casting requirements are still not met, casting is stopped. The adjustment time of each process is not adjusted within a fixed threshold.

5. The production scheduling method based on steelmaking mechanism according to claim 4, characterized in that, If the converter's production capacity is sufficient, the converter can be scheduled to start production and press steel operations in advance to make up for any foreseeable shortages in steel supply. If, during the scheduling process, there are issues such as insufficient converter production capacity, ladles not arriving, or molten iron and scrap steel not arriving, which cause delays in the converter scheduling, then it is necessary to reduce converter time, logistics time, refining time, or decrease the continuous casting speed.

6. The production scheduling method based on steelmaking mechanism according to claim 4, characterized in that, If the converter finishes smelting ahead of schedule and enters the refining stage, the refining process can allow the ladle to hold the steel for a period of time. If the converter is delayed, the refining process time and logistics time should be accelerated, or the continuous casting speed should be reduced in advance.

7. The production scheduling method based on steelmaking mechanism according to claim 4, characterized in that, Continuous casting is carried out strictly according to the schedule. If the production time of the preceding process is delayed, the casting speed of the previous furnace is reduced to make up for the time delay.

8. A production scheduling system based on steelmaking mechanisms, characterized in that, include: The matching calculation module is used to perform matching calculations between converter and continuous casting capacity during the steelmaking process, so that converter production can guarantee continuous continuous casting production. The matching calculation of converter and continuous casting capacity in the steelmaking process includes: in: For the time period to be scheduled, For the number of casting machines in use, This represents the average consumption rate per furnace of the casting machine. The converter number currently in use. The average production speed of one converter furnace. For converter production time consumed due to other reasons, This refers to continuous casting production time consumed for other reasons; The continuous casting machine allocation module is used to calculate the maximum number of continuous casting furnaces for the day based on capacity matching, and then arrange the steel billet to the designated continuous casting machine for production according to the characteristics of the billet. The converter refining scheduling module is used to calculate the start time of the refining furnace and converter for the continuous casting heat based on the start time of the heat. This includes: Based on the determination of the continuous casting furnace batch, the converter furnace schedule is arranged according to the principles of time priority and proximity, with priority given to freeing up the default refining process time. Then select a suitable refining furnace base. The start time for processing is determined based on the start time of continuous casting and the refining time in the refining furnace. If the converter time is delayed, the time of each process needs to be dynamically adjusted backward. The dynamic adjustment module is used to dynamically adjust the converter and refining schedules in the forward process while keeping the continuous casting process unchanged.

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