LF refining double-station planned takeover method

Abstract

The invention relates to an LF refining double-station planned takeover method, and belongs to the technical field of steelmaking methods. According to the technical scheme, the method comprises the steps that a refining production plan of a three-level system and heat information in a converter production plan are obtained, first-level data of related station production judgment conditions in a field PLC are obtained, the plan is distributed to idle stations according to the tapping time of a converter and the production state of the stations, and pre-takeover is achieved. The method has the beneficial effects that the cost is low, the problem of automatic plan takeover in double-station refining can be effectively and timely solved, the refining production plan can be accurately and automatically issued to the corresponding station, the field working efficiency is improved, the working intensity of operators is reduced, and the field production intelligent level is improved.

Description

Technical Field

[0001] The invention relates to a method for planning and taking over of double-stations for LF refining, belonging to the technical field of steelmaking methods. Background Art

[0002] LF refining is an indispensable part of the steelmaking process. It is mainly used to remove impurities in molten steel, adjust the chemical composition, and improve the uniformity of molten steel. It plays a role in connecting the upper and lower parts and making the overall steelmaking production more stable and smooth. At present, many domestic steel mills adopt a dual-station production mode to improve the production efficiency of LF refining. The production plan is issued by the third-level system, and the on-site operators manually issue the plan on the second-level system to match the furnace information with the corresponding station. The correctness of the production plan takeover has an important impact on the production scheduling of the entire refining production and the generation of the corresponding production process parameter report.

[0003] With the digitization and intelligence of steel production, many artificial intelligence models for LF refining have emerged, such as the alloy addition model for calculating the amount of alloy added; the temperature prediction model for predicting the real-time temperature of molten steel; the slag making model for ensuring the reasonable refining slag system according to the amount of bulk material added in different periods, etc. The establishment and effective operation of these artificial intelligence models are inseparable from a large amount of real and effective production data. The accurate production plan takes over and provides a reliable basis for the training and optimization of the model.

[0004] To achieve LF refining double-station takeover, there are two traditional methods: The first is to take over manually. The on-site operator will query all production plans on the third-level system, and send the production plan to the corresponding workstation on the second-level system according to the actual production situation of the double workstation on site to match the furnace information. Although this manual takeover method has high accuracy, it requires human intervention. If the takeover time is slightly deviated, it will cause the production time to not match the actual time. Missing or wrong connection will lead to the loss of production information. The premise of high accuracy of manual takeover is to spend manpower to perform the takeover operation on time.

[0005] The second is to install cameras on site to identify the ladle numbers entering the production station, and match the ladle numbers with the corresponding furnace numbers to achieve planned takeover of specific stations. However, this method requires a special ladle management system to operate normally. However, many domestic steel mills currently do not have a complete ladle management system on site, so it is impossible to match the ladle numbers with the furnace numbers. In addition, the cameras involved in this method are easily affected by high temperatures and high dust on site, which significantly reduces the accuracy of ladle number recognition. After research and investigation, it was found that the service life of the cameras installed on site is generally low, and equipment damage often occurs. Replacing and repairing the cameras requires manpower and material costs. Therefore, this method cannot perform planned automatic takeover in a long-term and stable manner.

[0006] In summary, the traditional methods are insufficient in effectively solving the problem of LF refining double-station takeover, and cannot effectively meet the production site's demand for precise control of LF refining double-station takeover. Summary of the invention

[0007] The purpose of the present invention is to provide a method for LF refining double-station plan takeover, which utilizes the existing equipment at the refining site, without using detection and identification equipment such as cameras, by obtaining the furnace information in the refining production plan of the three-level system and the converter production plan, and obtaining the first-level data of the relevant station production judgment conditions in the on-site PLC, and accurately realizing the automatic plan takeover of LF refining according to the steel tapping time of the converter and the production status of the station, with low cost, and can effectively and timely solve the problem of automatic plan takeover in double-station refining, ensure that the refining production plan can be accurately and automatically issued to the corresponding station, improve the on-site work efficiency, reduce the work intensity of operators, and improve the level of on-site production intelligence, effectively solving the above-mentioned problems existing in the background technology.

[0008] The technical solution of the present invention is: a method for planning and taking over of a dual-station LF refining system, comprising the following steps: (1) Obtain the refining production plan and the furnace information of the converter in the production plan from the third-level system, obtain the primary data of the relevant workstation production judgment conditions in the on-site PLC, and sort the furnace numbers according to the actual converter entry time and actual steelmaking time; (2) After the furnace to be taken over has tapped steel, the third-level system displays the actual tapping time of the furnace, at which time the furnace is officially taken over; (3) After the program detects that a workstation has started production, it assigns the latest furnace of steel produced by the converter to the workstation that has started production, completing the planned takeover; (4) When the two refining stations are both in a non-production state, the program will prepare to take over the latest furnace produced by the converter in the three-level system to the two stations. At this time, the two stations compete to take over the same furnace, and the furnace taken over will be updated with the change of the latest furnace produced by the converter in the three-level system; (5) When the actual steel-out time of the converter is displayed in the three-level system, it means that the furnace has already tapped steel from the converter and is about to enter the refining production. After one of the two non-production stations starts production, it officially takes over the latest furnace tapping steel from the converter. The other production station continues to prepare to take over the remaining scheduled furnaces in the three-level system, which are the latest furnaces entering the converter, thereby completing the takeover of the production plans of each station.

[0009] In the step (1), if there is no production plan, it means that the entire production line has no production plan, and there is no need to take over the production plan at this time; if there is a plan, the production status of the two current refining stations is detected. If both stations are in production at this time, there is no need to allocate plans for them; if both stations are not in production, the two stations are prepared to take over the latest batch of converters entering the station at the same time; if one of the two stations is in production, the non-producing station is prepared to take over the latest batch of converters entering the station.

[0010] The production status of the two workstations is monitored according to the lifting and lowering of the furnace cover of the refining double workstation and the judgment position of the argon blowing switch. The workstation whose furnace cover drops first and starts to blow in argon represents the start of production.

[0011] In the step (1), the refined production plan in the three-level system is read in real time with a period of 1 second.

[0012] In the step (1), the furnace information of the converter in the production plan includes the furnace number, the manufacturing order number, the actual converter entry time and the actual converter tapping time.

[0013] The beneficial effects of the present invention are as follows: by utilizing the existing equipment at the refining site, without using detection and identification equipment such as cameras, by obtaining the furnace information in the refining production plan of the three-level system and the converter production plan, the first-level data of the relevant workstation production judgment conditions in the on-site PLC is obtained, and according to the steel-out time of the converter and the production status of the workstation, the automatic plan takeover of LF refining is accurately realized, which is low-cost and can effectively and timely solve the problem of automatic plan takeover in double-station refining, ensure that the refining production plan can be accurately and automatically issued to the corresponding workstation, improve on-site work efficiency, reduce the work intensity of operators, and improve the level of on-site production intelligence. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions of the present invention will be clearly and completely described in conjunction with the implementation cases below. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] A method for taking over a dual-station plan for LF refining comprises the following steps: (1) Obtain the refining production plan and the furnace information of the converter in the production plan from the third-level system, obtain the primary data of the relevant workstation production judgment conditions in the on-site PLC, and sort the furnace numbers according to the actual converter entry time and actual steelmaking time; (2) After the furnace to be taken over has tapped steel, the third-level system displays the actual tapping time of the furnace, at which time the furnace is officially taken over; (3) After the program detects that a workstation has started production, it assigns the latest furnace of steel produced by the converter to the workstation that has started production, completing the planned takeover; (4) When the two refining stations are both in a non-production state, the program will prepare to take over the latest furnace produced by the converter in the three-level system to the two stations. At this time, the two stations compete to take over the same furnace, and the furnace taken over will be updated with the change of the latest furnace produced by the converter in the three-level system; (5) When the actual steel-out time of the converter is displayed in the three-level system, it means that the furnace has already tapped steel from the converter and is about to enter the refining production. After one of the two non-production stations starts production, it officially takes over the latest furnace tapping steel from the converter. The other production station continues to prepare to take over the remaining scheduled furnaces in the three-level system, which are the latest furnaces entering the converter, thereby completing the takeover of the production plans of each station.

[0016] In the step (1), if there is no production plan, it means that the entire production line has no production plan, and there is no need to take over the production plan at this time; if there is a plan, the production status of the two current refining stations is detected. If both stations are in production at this time, there is no need to allocate plans for them; if both stations are not in production, the two stations are prepared to take over the latest batch of converters entering the station at the same time; if one of the two stations is in production, the non-producing station is prepared to take over the latest batch of converters entering the station.

[0017] The production status of the two workstations is monitored according to the lifting and lowering of the furnace cover of the refining double workstation and the judgment position of the argon blowing switch. The workstation whose furnace cover drops first and starts to blow in argon represents the start of production.

[0018] In the step (1), the refined production plan in the three-level system is read in real time with a period of 1 second.

[0019] In the step (1), the furnace information of the converter in the production plan includes the furnace number, the manufacturing order number, the actual converter entry time and the actual converter tapping time.

[0020] The present invention utilizes the existing equipment at the refining site. Without using detection and identification equipment such as cameras, the present invention obtains furnace information such as the furnace number, manufacturing order number, actual converter entry time, actual converter tapping time, etc. in the refining production plan and converter production plan of the three-level system; obtains primary data of relevant workstation production judgment conditions in the on-site PLC, such as the workstation entry judgment position, the production start judgment position, or obtains corresponding primary data by judging the start of production of the corresponding workstation by the lowering of the furnace cover, the start of argon blowing, etc. Usually, about ten minutes after the converter taps steel, the molten steel will enter the LF refining. After the converter starts smelting, the three-level system will display the converter smelting furnace number, manufacturing order number, converter smelting start time, and record the tapping time when the converter taps steel. At the same time, the double workstations of LF refining have production marks. According to the converter tapping time and which workstation is currently idle after tapping steel, the plan can be allocated to the idle workstation to achieve pre-takeover. If both workstations are in a non-production state at this time, the two workstations will prepare to take over the same batch. After the pre-takeover, the production marks of the two workstations will be monitored in real time. Which workstation produces first will officially take over the batch. At the same time, the other workstation retrieves the latest batch of steel tapping in the schedule. According to the converter tapping time and the production status of the workstation, the automatic plan takeover of LF refining can be accurately achieved, which effectively solves the above-mentioned problems existing in the background technology.

[0021] When the computer is performing the above process, it not only needs to communicate directly with the PLC at the refining site through the Modbus protocol, but also needs to communicate with the third-level MES system. On the one hand, the computer will collect the furnace cover lifting and lowering conditions, argon blowing switch flag position, argon flow rate and other process parameters of the two-station refining furnace in the PLC in real time to determine whether the station is in production. On the other hand, it will read the production plan of the converter and refining from the third-level MES system, and sort the furnace number according to the actual entry time of the converter and the actual steel-out time. Through the first-level and third-level data obtained, the automatic takeover of the production plan is further realized.

[0022] In fact, LF double-station refining will not have two stations enter the station for production at the same time. LF refining is usually produced according to a continuous casting pouring, and the production sequence is arranged according to the pouring number and the casting sequence. Before a pouring starts, the LF refining double stations are in a non-production state. At this time, the two stations will compete to take over the latest furnace information of steel output. Whichever station starts production first will officially take over the plan of this furnace. The subsequent takeover is still based on the converter steel output time and the station production as the main takeover conditions, and the pouring number and casting sequence and the alternating production of the two stations as auxiliary takeover conditions to ensure the accuracy of automatic takeover of the production plan.

[0023] In practical application, the present invention is carried out according to the following steps: Step 1: The software program obtains the production plan of the converter and refining from the three-level system, and arranges them in reverse order according to the actual time of the converter entering the station. If there is no production plan, it means that there is no production plan for the entire production line, and there is no need to take over the production plan at this time. If there is a plan, the production status of the two current refining stations is detected. If both stations are in production at this time, there is no need to allocate a plan for them. If both stations are not in production, the two stations are prepared to take over the latest batch of converters entering the station at the same time. If one of the two stations is in production, the non-producing station is prepared to take over the latest batch of converters entering the station.

[0024] Step 2: After the furnace to be taken over has tapped steel, the third-level system will display the actual tapping time of the furnace, at which time the furnace can be officially taken over.

[0025] Step 3: After the program detects that a workstation has started production, it automatically assigns the latest batch of steel produced by the converter to the workstation that has started production, completing the automatic takeover of the plan.

[0026] Step 4: When the two refining stations are in a non-production state at the same time, the program will prepare to take over the latest furnace produced by the converter in the three-level system to the two stations. At this time, the two stations compete to take over the same furnace, and the furnace taken over will be updated with the changes of the latest furnace produced by the converter in the three-level system.

[0027] Step 5: When the actual steel-out time of the converter is displayed in the three-level system, it means that the furnace has tapped steel from the converter and is about to enter the refining production. After one of the two non-production stations starts production, it officially takes over the latest steel-out from the converter. The other production station continues to prepare to take over the remaining ordered heats of the latest converter in the three-level system, thus completing the takeover of the production plan of each station. Example 1

[0028] Step 1: The software program obtains the production plan of the converter and refining from the three-level system, and arranges it in reverse order according to the actual time of the converter entering the station. It is detected that the current refining station A and station B are both in a non-production state. The furnace number of the latest converter entering the station is 4B04935, which is sent to the two stations for preparation. Before the two stations start production, the plan information of the three-level system is not updated, and the furnace number to be taken over is always 4B04935.

[0029] Step 2: After the furnace 4B04935 taps steel, the third-level system displays the actual tapping time. At this time, the heat has become a heat that can be officially taken over.

[0030] Step 3: After the program detects that a workstation has started production, the workstation officially takes over the latest batch of steel produced by the converter.

[0031] Step 4: After the production of another station is completed, and after the third-level system adds the latest incoming furnace information, the station will prepare to take over the new incoming furnace.

[0032] Step 5: Heat 4B04936 is officially tapped from the converter, and station B is still in a non-production state. After station B is in production, 4B04936 is still the latest heat tapped from the converter, so station B officially takes over 4B04936. Thus, the planned automatic takeover of the refining double station is realized. Example 2

[0033] Step 1: The software program obtains the production plan of the converter and refining from the three-level system, and arranges it in reverse order according to the actual time of the converter entering the station. It is detected that the current refining station A and station B are both in a non-production state. The furnace number of the latest converter entering the station is 4B04937, which is sent to the two stations for preparation. Before the two stations start production, the plan information of the three-level system is not updated, and the furnace number to be taken over is always 4B04937.

[0034] Step 2: After the furnace 4B04937 taps steel, the third-level system displays the actual tapping time. At this time, the heat has become a heat that can be officially taken over.

[0035] Step 3: The program detects that the current station A has started production and automatically assigns 4B04937 to station A. At the same time, station B cancels the preparatory takeover of the furnace and continues to preparatory takeover of the remaining production plans of the three-level system.

[0036] Step 4: The third-level system adds the production information of the 4B04938 heat, indicating that the furnace has entered the converter station for production. At this time, the 4B04938 heat is assigned to the B station for preparation for takeover.

[0037] Step 5: Heat 4B04938 is officially tapped from the converter, and station B is still in a non-production state. After station B is in production, 4B04938 is still the latest heat tapped from the converter, so station B officially takes over 4B04938. Thus, the planned automatic takeover of the refining double station is realized. Example 3

[0038] Step 1: The software program obtains the production plan of the converter and refining from the three-level system, and arranges it in reverse order according to the actual time of the converter entering the station. It is detected that the current refining station A and station B are both in a non-production state. The furnace number of the latest converter entering the station is 4B04939, which is sent to the two stations for preparation. Before the two stations start production, the plan information of the three-level system is not updated, and the furnace number to be taken over is always 4B04939.

[0039] Step 2: After the furnace 4B04939 taps steel, the third-level system displays the actual tapping time. At this time, the heat has become a heat that can be officially taken over.

[0040] Step 3: The program detects that the current station A has started production and automatically assigns 4B04939 to station A. At the same time, station B cancels the preparatory takeover of the furnace and continues to preparatory takeover of the remaining production plans of the three-level system.

[0041] Step 4: The third-level system adds the production information of the 4B04940 heat, indicating that the furnace has entered the converter station for production. At this time, the 4B04940 heat is assigned to the B station for preparation for takeover.

[0042] Step 5: Heat 4B04940 is officially tapped from the converter, and station B is still in a non-production state. After station B is in production, 4B04940 is still the latest heat tapped from the converter, so station B officially takes over 4B04940. Thus, the planned automatic takeover of the refining double station is realized. Example 4

[0043] Step 1: The software program obtains the production plan of the converter and refining from the three-level system, and arranges it in reverse order according to the actual time of the converter entering the station. It is detected that the current refining station A is in production, and the furnace number in production is: 4B04941, and the B station is in non-production. The furnace number of the latest converter entering the station is 4B04942, which is sent to the B station for preparation. Before the production of the B station starts, the planning information of the three-level system is not updated, and the furnace number to be taken over is always 4B04942.

[0044] Step 2: After the furnace 4B04942 taps steel, the third-level system displays the actual tapping time. At this time, the heat has become a heat that can be officially taken over.

[0045] Step 3: The program detects that the current station B has started production and automatically assigns 4B04942 to station A. At this time, stations AB are both in production.

[0046] Step 4: The third-level system adds the production information of the 4B04943 heat, indicating that the furnace has entered the converter station for production. After the production of station A is completed, the 4B04943 heat will be assigned to station A for preparation for takeover.

[0047] Step 5: Heat 4B04943 is officially tapped from the converter, and station A is still in a non-production state. After station A starts production, 4B04943 is still the latest heat tapped from the converter, so station A officially takes over 4B04943. This realizes the automatic takeover of the alternating production plan of the refining double stations. Example 5

[0048] Step 1: The software program obtains the production plan of the converter and refining from the three-level system, and arranges it in reverse order according to the actual time of the converter entering the station. It is detected that the current refining station B is in production, and the furnace number in production is: 4B04950, and the A station is in non-production. The furnace number of the latest converter entering the station is 4B04951, which is sent to the A station for preparation. Before the production of the A station starts, the planning information of the three-level system is not updated, and the furnace number to be taken over is always 4B04951.

[0049] Step 2: After the furnace 4B04951 taps steel, the third-level system displays the actual tapping time. At this time, the heat has become a heat that can be officially taken over.

[0050] Step 3: The program detects that the current station A has started production and automatically assigns 4B04951 to station A. At this time, stations AB are both in production.

[0051] Step 4: The third-level system adds the production information of the 4B04952 heat, indicating that the furnace has entered the converter station for production. After the production of station B is completed, the 4B04952 heat will be assigned to station B for preparation for takeover.

[0052] Step 5: Heat 4B04952 is officially tapped from the converter, and station B is still in a non-production state. After station B is in production, 4B04952 is still the latest heat tapped from the converter, so station B officially takes over 4B04952. This realizes the automatic takeover of the alternating production plan of the refining double stations.

Claims

1. A method for planning and taking over of a double-station LF refining process, characterized in that The following steps are involved: (1) Obtain the refining production plan and the furnace information of the converter in the production plan from the third-level system, obtain the primary data of the relevant workstation production judgment conditions in the on-site PLC, and sort the furnace numbers according to the actual converter entry time and actual steelmaking time; (2) After the furnace to be taken over has tapped steel, the third-level system displays the actual tapping time of the furnace, at which time the furnace is officially taken over; (3) After the program detects that a workstation has started production, it assigns the latest furnace of steel produced by the converter to the workstation that has started production, completing the planned takeover; (4) When the two refining stations are both in a non-production state, the program will prepare to take over the latest furnace produced by the converter in the three-level system to the two stations. At this time, the two stations compete to take over the same furnace, and the furnace taken over will be updated with the change of the latest furnace produced by the converter in the three-level system; (5) When the actual steel-out time of the converter is displayed in the three-level system, it means that the furnace has already tapped steel from the converter and is about to enter the refining production. After one of the two non-production stations starts production, it officially takes over the latest furnace tapping steel from the converter. The other production station continues to prepare to take over the remaining scheduled furnaces in the three-level system, which are the latest furnaces entering the converter, thereby completing the takeover of the production plans of each station.

2. The method for planning and taking over of a dual-station LF refining system according to claim 1, characterized in that: In the step (1), if there is no production plan, it means that the entire production line has no production plan, and there is no need to take over the production plan at this time; if there is a plan, the production status of the two current refining stations is detected. If both stations are in production at this time, there is no need to allocate plans for them; if both stations are not in production, the two stations are prepared to take over the latest batch of converters entering the station at the same time; if one of the two stations is in production, the non-producing station is prepared to take over the latest batch of converters entering the station.

3. The method for planning and taking over of a dual-station LF refining system according to claim 2, characterized in that: The production status of the two workstations is monitored according to the lifting and lowering of the furnace cover of the refining double workstation and the judgment position of the argon blowing switch. The workstation whose furnace cover drops first and starts to blow in argon represents the start of production.

4. The method for planning and taking over of a dual-station LF refining system according to claim 1, characterized in that: In the step (1), the production plan of the converter and refining in the three-level system is read in real time with a period of 1 second.

5. The method for planning and taking over of a dual-station LF refining system according to claim 1, characterized in that: In the step (1), the furnace information of the converter in the production plan includes the furnace number, the manufacturing order number, the actual converter entry time and the actual converter tapping time.