JP5672047B2 - Method for allocating steel out of ladle and apparatus for allocating steel out of ladle - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for allocating steel in a ladle and a device for allocating steel in a ladle for allocating a ladle necessary for molten steel processing in a steelmaking factory to a tapping charge.

  In the molten steel treatment in the steelmaking factory, the molten steel discharged from the converter is poured into a molten steel pan whose inner wall surface is covered with a refractory and adjusted to the desired components and temperature in the secondary refining equipment, It is poured from a molten steel pan into a continuous casting facility and cast into intermediate products such as slabs and billets. And the molten steel pan from which the molten steel was emptied is maintained and then transported to the converter again, and the same operation is repeated.

  In such molten steel treatment, if the lead time from molten steel to casting is the same, that is, if the time that the molten steel pan is occupied is the same for each outgoing steel charge, the molten steel pan can be used continuously. It is possible to easily grasp the number of molten steel pans necessary for the operation and which molten steel pans are allocated. Note that the steel output charge means a batch process in which blowing in the converter is a unit, in other words, molten steel that is output from the converter in a single steel output process.

JP 2000-315109 A

  However, in actual molten steel processing, in order to produce a wide variety of steel products, the processing content in the secondary refining equipment and continuous casting equipment varies depending on the steel output charge. For this reason, the time required for the molten steel to pass through the secondary refining equipment and the continuous casting equipment varies depending on the outgoing steel charge, and the lead time from the outgoing steel to the casting of the molten steel changes depending on the outgoing steel charge. Thereby, in actual molten steel processing, it was difficult to grasp, for example, the number of molten steel pans required per day and which molten steel pans can be allocated.

  Generally, in actual molten steel processing, molten steel is sequentially discharged and transported based on the processing time and processing sequence in each of the converter, secondary refining equipment, and continuous casting equipment. For this reason, if it is not possible to accurately grasp the number of molten steel pans to be allocated to the molten steel that is sequentially discharged from the converter and the number of molten steel pans to be transported, the operation can be maintained for reasons such as insufficient number of molten steel pans. Disappear. Moreover, the longer it is left in an empty pan, the more time, heat source, and fuel are required to raise the temperature the next time the molten steel pan is used. Based on this, it is hoped to provide a method for allocating molten steel in the ladle and an apparatus for allocating the molten steel in the ladle that allow the operator to grasp the number of molten ladles and the number of necessary molten ladles to be allocated to the molten steel processing according to the steelmaking plan. It is rare.

  In particular, the arc process, which is a type of secondary refining, requires high-grade steel for refining high-grade steel, requiring expensive equipment for the molten steel pan, and occupying the molten steel pan because it takes longer to process than other processes. Long time. For this reason, it is desirable from the standpoint of cost to use a dedicated molten steel pan for charging the steel that passes through the arc process.

  Patent Document 1 discloses a method for calculating the order in which various types of production lots are processed in a converter, secondary refining equipment, and continuous casting equipment, and the start time of each processing. According to this method, it is possible to grasp the time during which the molten steel pan is occupied based on the start time of each process. However, with this method, it is not possible to grasp the number of molten steel pans and the number of necessary molten steel pans allocated for the molten steel processing according to the steel production plan.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to grasp a dedicated ladle allocated to a molten steel process that passes through an arc process according to a steel production plan, efficiently operate it, and take it out. It is an object of the present invention to provide a method for allocating steel from a ladle and a device for allocating steel from a ladle that can be efficiently operated as a whole steel plan.

In order to solve the above-mentioned problems and achieve the object, the method of allocating steel for ladle according to the present invention includes information on the time for finishing steel for each steeling charge, information on the time for finishing casting, and for each ladle. based final cast end time of the on tapping plan data including, among the respective tapping charge time from tapping end time until the final casting time is more than a predetermined time, the tapping charge passing through the arc process A step of allocating, a step of allocating a ladle dedicated to the arc process with the closest final casting end time that can be allocated to each extracted steel charge, and a transition of the occupation time of each ladle dedicated to the arc process Displaying and outputting.

Moreover, in the above invention, the method for allocating steel in the ladle according to the present invention does not pass through the arc process in which the time from the steel exit end time to the casting end time is less than a predetermined time among the respective steel exit charges. A step of extracting a steel discharge charge , a step of allocating a molten steel ladle that is not used in the arc process with the closest final casting end time that can be allocated to each steel egress charge, and an occupation time of each molten steel ladle that is not used in the arc process And a step of displaying and displaying the transition of

Moreover, the steelmaking allocation apparatus for the molten steel pan according to the present invention includes a steelmaking plan including information on a steelmaking end time for each steeling charge, information on a casting end time, and a final casting end time for each molten steel pan. based on the data, among the respective tapping charge, the time from the tapping end time to cast the end time of the predetermined time or more, means for extracting the tapping charge passing through the arc process, extracted each tapping Means for allocating a dedicated ladle for the arc process with the closest final casting end time that can be allocated for charging, and means for displaying and outputting the transition of the occupancy time of each ladle dedicated to the arc process. Features.

  According to the method for allocating steel for ladle according to the present invention and the apparatus for allocating steel for ladle, a dedicated ladle or a necessary ladle for allocating to molten steel processing that passes through an arc process according to the steel plan. Since the number can be operated efficiently, the number of expensive molten steel ladles can be reduced, and the entire steel production plan including other ladle pans that are allocated to the molten steel processing that does not pass through the arc process can be efficiently operated, which is necessary for molten steel processing. Saving time, heat source and fuel.

FIG. 1 is a schematic diagram for explaining the flow of molten steel processing. FIG. 2 is a block diagram showing a configuration of an apparatus according to an embodiment of the present invention. FIG. 3 is a flowchart showing the flow of the process for allocating steel output according to an embodiment of the present invention. FIG. 4 is an explanatory diagram for explaining a process for allocating steel output according to an embodiment of the present invention. FIG. 5 is an explanatory diagram for explaining a process for allocating steel output according to an embodiment of the present invention. FIG. 6 is a diagram showing a result of allocating a molten steel pan to a steel output charge by a steel output allocation process according to an embodiment of the present invention. FIG. 7 is a diagram showing a result of allocating a molten steel pan to a steel output charge by a steel output allocation process according to an embodiment of the present invention.

  Hereinafter, with reference to the drawings, a method for allocating steel in a ladle and an apparatus for allocating steel according to an embodiment of the present invention will be described.

[Flow of molten steel treatment]
First, with reference to FIG. 1, the flow of the molten steel process used as the processing object of the molten steel pan allocation method and the allocated steel allocation apparatus which are one Embodiment of this invention is demonstrated.

  FIG. 1 is a schematic diagram for explaining the flow of molten steel processing. In FIG. 1, only main steps are illustrated for the sake of simplicity. As shown in FIG. 1, in the molten steel process in a steelmaking factory, first, the molten steel 2 discharged from the converter 1 is poured into a molten steel pan 3 whose inner wall surface is covered with a refractory. Next, the molten steel 2 poured into the molten steel pan 3 is adjusted to a target component and temperature in the secondary refining equipment (secondary refining). Specifically, in the secondary refining equipment, additives such as alloy iron and chemicals for component adjustment are added to the molten steel 2 through the introduction pipe 4 in accordance with the steel output components and specifications. And especially in an arc process, the electrode 7 is immersed in the slag produced on the molten steel 2, an electric field is formed between the molten steel 2, and the inert gas is supplied from the bottom surface of the molten steel pan 3 through the nozzle 5. By this, the molten steel 2 is adjusted to the target component and temperature while stirring the molten steel and slag (gas stirring treatment) to keep the temperature uniform. Next, the molten steel 2 adjusted to the target component and temperature is transported to the continuous casting machine 6 in a state where it is put in the molten steel pan 3, and poured into the continuous casting equipment 6 to produce intermediate products such as slabs and billets. Casting (continuous casting). The molten steel pan 3 from which the molten steel 2 has been emptied is transported to the converter 1 again after maintenance of the inner wall surface and maintenance / replacement of the nozzle 5 (empty pan maintenance), and the same operation is repeated. Done.

  In addition, after the casting is finished and the molten steel 2 is emptied, a predetermined setup time is required for maintenance of the empty pan and transportation to the converter 1 before the molten steel pan 3 can be used for the next steel charging. When the molten steel pan 3 is used for a process requiring a gas stirring process such as an arc process, the nozzle 5 is replaced every time the gas stirring process is performed a predetermined number of times. The above-described setup time includes such nozzle replacement time.

[Configuration of equipment for allocating steel production]
Next, with reference to FIG. 2, the structure of the steel output allocation apparatus which is one Embodiment of this invention is demonstrated.

  FIG. 2 is a block diagram showing a configuration of a steel output allocating device according to an embodiment of the present invention. As shown in FIG. 2, a steel production allocation device 10 according to an embodiment of the present invention is configured by an arithmetic processing device such as a workstation, and includes a steelmaking database (DB) 11, a terminal interface 12, and a calculation unit 13. Prepare.

  The steelmaking DB 11 stores steel production plan data planned in the steelmaking factory 20. The steel output plan data includes data regarding the number of steel output charges per predetermined time such as one day, data regarding each steel output charge, the number of molten steel pans, and data regarding each steel ladle. Data related to each steel charge is taken for the time when molten steel is discharged from the converter (finishing end time), when the casting of the molten steel ends (casting end time), and for the molten steel discharged from the converter. And at least data relating to components of the molten steel (steel type component) produced from the converter. Moreover, the data regarding each molten steel pan include at least the final casting end time. Data such as a steelmaking start time and a casting end time stored in the steelmaking DB 11 are rewritten via the terminal interface 12 when the operator operates the terminal device 21 connected to the device 10 to allocate steelmaking. Can do.

  The calculation unit 13 is configured by a calculation processing device such as a CPU. The calculation unit 13 loads a steel allocation allocation program stored in a ROM (not shown) into the RAM, and executes the steel allocation allocation program loaded in the RAM, thereby executing the molten steel pan necessary for the molten steel processing. Is allocated to the steel output charge. The calculation unit 13 can output the calculation result to the display device or output device of the terminal device 21 operated by the operator via the terminal interface 12.

  The steel production allocation apparatus 10 having such a configuration includes a steel ladle dedicated to an arc process that allocates a molten steel process having a long processing time to pass through the arc process by executing the following steel allocation process. Determine the number of molten steel pans required. Hereinafter, with reference to the flowchart shown in FIG. 3, the operation of the outgoing steel allocation device 10 when executing the outgoing steel allocation process will be described.

[Procedure for steel production allocation]
FIG. 3 is a flowchart showing the flow of the process for allocating steel output according to an embodiment of the present invention. The flowchart shown in FIG. 3 starts at the timing when the operator operates the terminal device 21 to instruct the operation unit 13 to execute the process for allocating steel output through the terminal interface 12, and the process for allocating steel output is performed in step S1. Proceed to the process. Note that the operator instructs execution of the process for allocating steel output according to the present embodiment at the start of work, for example.

  In the process of step S1, the calculating part 13 acquires the data regarding the plan object sunrise steel charge from the steel production plan data memorize | stored in steelmaking DB11, and the time of steel production end time-casting end time is more than predetermined time. M steel extraction charges are extracted and sorted in ascending order of the steel output end time. For example, data relating to M steel-making charges whose time from the steel-making end time to the casting end time is equal to or longer than a predetermined time is extracted from among the steel-making charges on the planned date as shown in FIG. , Sort in ascending order of the steelmaking end time, and give the steeling charge number (I) in that order. Thereby, the process of step S1 is completed, and the steelmaking allocation process shifts to the process of step S2.

  In addition, FIG. 4 shows the example which sorted the steeling charge of 30 of the plan object date in order of the early steeling end time, FIG. 5 is more than predetermined time in order to pass an arc process from the steeling charge of FIG. This is an example in which the steeling charges are extracted and sorted in the order of the steeling end time, and the number M is 6.

  Here, the predetermined time in the present embodiment is set in advance including the time required to pass the arc process. That is, the steel output charge that takes a predetermined time or more means a steel output charge that passes through the arc process. The molten steel ladle assigned to each outgoing steel charge by the outgoing steel allocation process of the present embodiment is a ladle dedicated to the arc process. Information regarding whether or not each steel charge passes through the arc process is included in the data related to the steel production plan data stored in the steelmaking DB 11, and it can be extracted by referring to this in the process of step S <b> 1. Good.

  Each steeling charge starts at the steeling end time and ends at the casting end time. In other words, in the process of allocating an outgoing steel charge, which will be described later, to the empty molten steel ladle, the earlier the outgoing steel finish time of the outgoing steel charge, the earlier the molten steel ladle can be allocated.

  In the process of steps S2 to S4, the calculation unit 13 performs the process of allocating the I-th outgoing steel charge to the molten steel ladle by the process after step S5 described below until I becomes 1 to M (steps S3 and S3). Step S4, Yes) and repeat.

  In the process of step S5, the calculation part 13 acquires the data regarding N pieces of molten steel ladle from the steel production plan data memorize | stored in steelmaking DB11, and uses the data regarding the N pieces of molten steel ladle of the last casting end time. Sort in ascending order, and give the ladle number (J) in that order. Thereby, the process of step S5 is completed, and the steelmaking allocation process shifts to the process of step S6.

  Here, the N molten steel pans correspond to the molten steel pans that have been allocated as a result of executing the outgoing steel allocation process before the time of executing the outgoing steel allocation process according to the present embodiment. Also, the final casting end time included in the data related to the molten steel pan is obtained by referring to the result of executing the steelmaking allocation process before the time of executing the steelmaking allocation process according to the above-described embodiment, for example. it can. Each of the molten steel pans becomes empty after a predetermined set-up time (S1_TIME) required for maintenance of the empty pan and transportation to the converter 1 after the end time of casting. Thus, there is a possibility that the molten steel pan with the earlier final casting end time becomes empty earlier.

  In the process of steps S6 to S8, the calculation unit 13 determines whether J is 1 from the process of determining whether the I-th outgoing steel charge can be allocated to the J-th molten steel pan by the process after step S9 described below. Repeat until N (step S7, step S8, Yes).

  In the process of step S9, the calculation unit 13 sets the set-up time (S1_TIME) to the steelmaking finish time (LD_END (I)) of the Ith steel charge and the final casting finish time (CC_END (J)) of the Jth molten steel pan. ) Is compared with the time of addition, and it is determined which is later. That is, the calculation part 13 is the following formula (1), after the final casting end time (CC_END (J)) of the Jth molten steel pan, the steeling end time (LD_END (I) of the Ith steel charging) ) Until the setup time (S1_TIME) can be determined.

    LD_END (I) −CC_END (J) ≧ S1_TIME (1)

  When the steelmaking finish time of the I-th steelmaking charge is earlier than the time when the setup time (S1_TIME) is added to the final casting finish time of the Jth molten steel pan, that is, the setup time (S1_TIME) cannot be taken. In this case (No at Step S9), since it is impossible to allocate the I-th outgoing steel charge to the J-th molten steel pan, the process proceeds to Step S7. That is, the calculating part 13 performs the same judgment about the (J + 1) th molten steel pan. On the other hand, when the steelmaking finish time of the I-th steelmaking charge is after the time when the setup time (S1_TIME) is added to the final casting finish time of the Jth molten steel pan, that is, the setup time (S1_TIME) can be taken. In the case (step S9, Yes), the calculation unit 13 allocates the I-th outgoing steel charge to the J-th molten steel pan and stores it in an appropriate storage unit (step S10). Thereby, the process of step S10 is completed, and the steelmaking allocation process shifts to the process of step S3. And the calculating part 13 increases I by 1 (step S3), and the process (steps S5-S11) which allocates the I-th outgoing steel charge to a molten steel pan until I exceeds M (step S4, step S4). Yes) Repeat.

  In addition, even if J reaches N, when the I-th outgoing steel charge cannot be allocated to the J-th molten steel pan (step S8, No), the calculation unit 13 uses I for the N molten steel pans. It is determined that it is not possible to allocate the second steel charge, and the (N + 1) th new molten steel pan is allocated and stored in an appropriate storage unit (step S11). Thereafter, the process for allocating steel output shifts to the process of step S3.

  When the process of allocating a molten steel pan is completed for all M steel output charges by the procedure described above (No at Step S4), the process of allocating steel output shifts to the process at Step S12.

  In the process of step S12, the calculation part 13 outputs the result of the steel-out charge obtained by the above process and the reserved molten steel ladle via the terminal interface 12, and displays it on the display device of the operation terminal 21. And is stored in the steelmaking DB 11. FIG. 6 is a diagram exemplifying a list of outgoing steel charges allocated to each molten steel pan to be output when the number M of outgoing steel charges is 6 and the number N of molten steel pans is 3. 6 shows the result of allocating 6 ladle charges passing through the arc process shown in FIG. 3 to the three molten steel ladles with a setup time (S1_TIME) = 180 minutes. Thereby, the process of step S12 is completed, and a series of steelmaking allocation processes is completed.

  In addition, in the plan object sunrise steel charge, the remaining steel charge that has not been extracted in step S1, that is, the time from the steel exit end time to the casting end time is less than a predetermined time because it does not pass through the arc process. As for the charge, by performing similarly the processing after step S2 of the above-mentioned steel supply allocation process, it is possible to efficiently allocate a molten steel pan different from the arc pan dedicated to the arc process. In that case, the set-up time is set shorter than 180 minutes in the case of the steel output charge passing through the arc process. For example, it is set to 40 minutes. FIG. 7 is a diagram exemplifying a list of outgoing steel charges allocated to each molten steel pan to be output when the number M of outgoing steel charges not passing through the arc process is 24 and the number N of molten steel pans is 5. Yes, the steel charging charge illustrated in FIG. 4 minus 6 steel charging charges passing through the arc process illustrated in FIG. 5 was allocated to five molten steel pans with a setup time (S1_TIME) = 40 minutes. Results are shown.

  As is clear from the above description, according to the process for allocating steel output according to an embodiment of the present invention, the calculation unit 13 applies an arc to the steel output charge passing through the arc process based on the steel output plan data. It is possible to efficiently operate by allocating as much time as possible to make the process-use molten steel pan empty. As a result, it is not necessary to reserve an expensive ladle dedicated to the arc process, and the number required for operation can be reduced. In addition, a steel ladle that is not used in the arc process can be efficiently allocated for the steel charge that does not pass through the arc process. According to such a process for allocating steel, the operator knows the number of molten steel pans to be allocated to the molten steel processing based on the output result and the number of necessary molten steel pans, and operates for reasons such as the lack of molten steel pans. Can not be maintained. In particular, by distinguishing and allocating the molten steel pan that performs the arc process and the molten steel pan that does not perform the arc process, the number of expensive molten steel pans that perform the arc process can be reduced, so that the cost of the molten steel pan can be reduced. Moreover, since the molten steel pan can be efficiently operated as the entire steel production plan, the time, heat source and fuel required for the molten steel processing can be saved.

  Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Converter 2 Molten steel 3 Molten steel ladle 4 Introducing pipe 5 Nozzle 6 Continuous casting machine 7 Electrode 10 Steeling allocation apparatus 11 Steelmaking database 12 Terminal interface 13 Calculation part 21 Terminal apparatus

Claims (3)

Based on the steelmaking plan data including information on the steelmaking end time for each steeling charge, information on the casting end time, and the final casting end time for each molten steel pan , out of each said steeling charge, Extracting the steel charge that passes through the arc process, the time from the time to the casting end time being a predetermined time or more;
A step of allocating a dedicated ladle for an arc process having the closest final casting end time that can be allocated to each extracted steel charge;
A step of displaying and outputting the transition of the occupancy time of each ladle dedicated to the arc process ;
A method for allocating steel out of a ladle, characterized by comprising: A step of extracting a steel output charge that does not pass through the arc process, the time from the steel output end time to the casting end time being less than a predetermined time among the steel output charges, and a final casting that can be allocated to each steel output charge The method includes: a step of allocating a molten steel pan not used for the arc process having the closest end time; and a step of displaying and outputting a transition of an occupation time of each molten steel pan not used for the arc process. To allocate steel for ladle. Based on the steelmaking plan data including information on the steelmaking end time for each steeling charge, information on the casting end time, and the final casting end time for each molten steel pan , out of each said steeling charge, Means for extracting the steel charge passing through the arc process, the time from the time to the casting end time being a predetermined time or more;
Means for allocating a dedicated ladle for an arc process having the closest final casting end time that can be allocated to each of the extracted steel charges;
Means to display and output the transition of the occupation time of each ladle dedicated to the arc process ;
An apparatus for allocating steel out of a molten steel pan, characterized by comprising:

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