JP2012092400A - Tapping allowance method of molten steel pan, and tapping allowance device of molten steel pan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to grasp a molten steel pan allowed to a molten steel treatment and a required number of molten steel pans.SOLUTION: A calculation part 13 allows a molten steel pan in which allowance is possible with the last casting finish time nearest to each of the tapping charges, and display outputs the transition of an occupancy time of each of the molten steel pans based on information on a tapping finish time for every tapping charge, information on a casting finish time, information on whether a gas stirring treatment is required or not in secondary refining equipment about the tapping charge, and tapping planning data including information on frequency of a gas stirring treatment of each of molten steel pans.

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 and fuel it takes 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.

  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 problems, and its purpose is to provide a molten steel pan capable of efficiently operating the molten steel pan by grasping the molten steel pan allocated for the molten steel treatment according to the steel output plan. It is to provide a method for allocating steel and a device for allocating steel for a ladle.

  In order to solve the above-mentioned problems and achieve the object, the method of allocating steel in the ladle according to the present invention includes information on the time for finishing steel for each steel output charge, information on the time for finishing steel casting, Based on the steel production plan data including information on whether or not gas stirring treatment is required in the secondary refining equipment for charging, information on the number of times of gas stirring treatment for each molten steel pan, and the final casting end time, It includes a step of allocating a molten steel pan having the closest final casting end time that can be allocated to the steel discharge charge, and a step of displaying and outputting the transition of the occupation time of each molten steel pan.

  In order to solve the above-described problems and achieve the object, the apparatus for allocating steel for a ladle according to the present invention includes information on the time of finishing steel for each steeling charge, information on the time of casting end, Based on the steel production plan data including information on whether or not gas stirring treatment is required in the secondary refining equipment for charging, information on the number of times of gas stirring treatment for each molten steel pan, and the final casting end time, It is characterized by comprising means for allocating a molten steel pan having the closest final casting end time that can be allocated to the steel charging, and means for displaying and displaying the transition of the occupation time of each molten steel pan.

  According to the method for allocating steel for ladle according to the present invention and the apparatus for allocating steel for ladle, it is possible to grasp the number of ladles and the number of necessary ladles to be allocated for the molten steel processing according to the ladle plan, Since the molten steel pan can be operated well, the time and fuel required for molten steel processing can be saved.

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 a diagram illustrating 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 an additive is stirred (gas stirring process) by supplying an inert gas from the bottom face of the molten steel pan 3 through the nozzle 5, and the molten steel 2 is adjusted to the target component and temperature. 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.

  The nozzle 5 of the molten steel pan is replaced every time the gas stirring process is performed a predetermined number of times. When replacing the nozzle 5, after the casting is finished and the molten steel 2 is emptied, the molten steel pan 3 can be used for the next steel charging, and then the normal ladle maintenance or transportation to the converter 1 is performed. In addition to the setup time required for the nozzle replacement time is required.

[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 ladle include at least the number of times of performing the gas stirring process in the molten steel pan (the number of times of the gas stirring process) and 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.

[Procedure for steel production allocation]
The steel allocation device 10 having such a configuration determines the number of molten steel pans and the number of necessary steel pans to be allocated for the molten steel processing by executing the following steel allocation allocation process. 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.

  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 M steel-making charges from the steel-making plan data memorize | stored in steelmaking DB11, for example, as shown in FIG. The data relating to the steelmaking are sorted in the order of the steelmaking end time, and the steeling charge number (I) is assigned in that order. FIG. 4 shows an example of sorting in the order of the steelmaking end time when the number M of steeling charges is 30. Thereby, the process of step S1 is completed, and the steelmaking allocation process shifts to the process of step S2. 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. Moreover, the data regarding each molten steel pan contain the number of times of gas stirring treatment. The nozzle needs to be replaced every time the number of gas stirring processes reaches a predetermined number. When no nozzle replacement is required, each molten steel pan 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 of casting. If necessary, after a predetermined nozzle replacement time (S2_TIME) in addition to the setup time (S1_TIME), the state becomes empty. 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 that case (step S9, Yes), the steel output allocation process proceeds to the process of step S10.

  In the processes of steps S10 to S15, the calculation unit 13 determines whether the I-th steel-out charge requires gas stirring in the secondary refining equipment (step S10) and the J-th molten steel pan. Based on the number of times of gas agitation processing (step S11), it is determined whether or not the I-th outgoing steel charge can be allocated to the J-th molten steel pan.

  That is, when the I-th steel-out charge requires a gas stirring process in the secondary refining equipment (step S10, Yes), the calculation unit 13 confirms the number of gas stirring processes in the J-th molten steel pan, When the predetermined number of times necessary for nozzle replacement has not been reached (step S11, No), 1 is added to the number of times of the gas stirring process of the Jth molten steel pan (step S12), and then the Ith steel charging is performed. The J-th molten steel pan is allocated (step S13). On the other hand, when the I-th steel charging is not required for the gas refining process in the secondary refining equipment (No in step S10), the calculation unit 13 allocates the I-th steel charging to the J-th molten steel pan. (Step S13).

  In the process of step S11, when the number of gas stirring processes of the J-th molten steel pan has reached a predetermined number of times that requires nozzle replacement (step S11, Yes), the calculation unit 13 determines that the I-th steel charging charge. The comparison is made between the time of finishing steel (LD_END (I)) and the time of adding the setup time (S1_TIME) and the nozzle replacement time (S2_TIME) to the final casting end time (CC_END (J)) of the J-th molten steel pan. It is determined which is slower (step S14). That is, the calculation unit 13 uses the following equation (2) to calculate the steeling end time (LD_END (I) of the I-th steel charging after the final casting end time (CC_END (J)) of the J-th molten steel pan. ) Until the setup time (S1_TIME) and the nozzle replacement time (S2_TIME) can be determined.

  LD_END (I) −CC_END (J) ≧ S1_TIME + S2_TIME (2)

  When the steelmaking finish time of the I-th steelmaking charge is earlier than the time when the setup time (S1_TIME) and the nozzle replacement time (S2_TIME) are added to the final casting finish time of the Jth molten steel pan, that is, the setup time If it is not possible to take (S1_TIME) and the nozzle replacement time (S2_TIME) (No in step S14), it is impossible to allocate the I-th outgoing steel charge to the J-th molten steel pan. Move on to processing. 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) and the nozzle replacement time (S2_TIME) are added to the final casting finish time of the Jth molten steel pan, that is, the setup time When (S1_TIME) and the nozzle replacement time (S2_TIME) can be taken (step S14, Yes), the calculation unit 13 resets (initializes) the number of gas stirring processes of the Jth molten steel pan ( In step S15), the I-th outgoing steel charge is allocated to the J-th molten steel pan and stored in an appropriate storage unit (step S13). Thereby, the process of step S13 is completed, and the steelmaking allocation process shifts to the process of step S3. And the calculating part 13 increases I one by one (step S3), and the process (steps S5-S16) 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 first steel charge, and the (N + 1) th new molten steel pan is allocated and stored in an appropriate storage unit (step S16).

  When the process of allocating a molten steel pan is completed for all M steel output charges by the above-described procedure (No at Step S4), the process of allocating steel output shifts to the process of Step S17.

  In the process of step S <b> 17, the calculation unit 13 outputs the result of the steel discharge 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. 5 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 30 and the number N of molten steel pans is 7. The result of allocating 30 molten steel charges to seven molten steel pans with the setup time (S1_TIME) = 40 minutes and the nozzle replacement time (S2_TIME) = 40 minutes is shown. In FIG. 5, the number of times of gas stirring treatment of the pan is added on the line indicating each steel charge, and the nozzle is changed every time the gas stirring treatment is performed eight times (for example, pan number J = 3, 6 for black inverted triangles in FIG. Thereby, the process of step S17 is completed and a series of the steelmaking allocation processes is completed.

  As is clear from the above description, according to the steelmaking allocation process that is one embodiment of the present invention, the calculation unit 13 can make time for the molten steel pan to be empty based on the steelmaking plan data as much as possible. Reserve for the steel output charge to make it shorter. According to such a process for allocating steel, the operator grasps the number of molten steel pans and the number of required molten steel pans to be allocated for molten steel processing based on the output result, and the operation is not performed due to the lack of the number of molten steel pans. It can suppress that it becomes impossible to maintain. Moreover, since the molten steel pan can be operated efficiently, the time and fuel required for 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 Introductory pipe 5 Nozzle 6 Continuous casting machine 10 Outgoing steel allocation apparatus 11 Steelmaking database 12 Terminal interface 13 Operation part 21 Terminal apparatus

Claims (2)

Information on the steelmaking end time for each steeling charge, information on the casting end time, information on whether or not gas stirring processing is necessary in the secondary refining equipment for the steeling charge, and gas stirring for each molten steel pan A step of allocating a molten steel ladle having the closest final casting end time that can be allocated to each of the steelmaking charges based on the steelmaking plan data including information on the number of processing times and the final casting end time;
Displaying and outputting the transition of the occupation time of each molten steel pan;
A method for allocating steel out of a ladle, characterized by comprising: Information on the steelmaking end time for each steeling charge, information on the casting end time, information on whether or not gas stirring processing is necessary in the secondary refining equipment for the steeling charge, and gas stirring for each molten steel pan Based on the steel production plan data including the information on the number of processing times and the final casting end time, means for allocating the molten steel ladle with the closest final casting end time that can be allocated to each steel output charge,
Means to display and output the transition of the occupation time of each ladle,
An apparatus for allocating steel out of a molten steel pan, characterized by comprising:

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