JPH09249903A - Scheduling method in molten iron supply and demand control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scheduling method of a molten iron supply and demand control in an integrated iron-and-steel works enabling the operational schedule planning strategically combining an iron-making process and steelmaking process. SOLUTION: The demand quantity of molten iron and the arrangement time are calculated in each operational unit and the molten iron needed to each operational unit is obtd. as a function in this kind. The times of treatment in each operational unit needing pretreatment of the molten iron before continuous casting is calculated. Further, a pattern of treating process which unnecessitates the molten iron pretreatment and passes through while going back to the iron-making process from the blowing process, is calculated. The molten iron carried out from the iron-making process is controlled as a stock in the blowing process. Then, a physical distribution simulation gone back toward the upstream process is executed and the demand quantity of the molten iron is calculated as a function of the time by the result of the physical distribution simulation and the production cost developed in each kind of the operation in the molten metal pretreatment process is calculated. The iron tapping quantity in the iron tapping process in the iron-making process is calculated as the function of the iron tapping time from the time function of the calculated molten iron demande quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot metal production management method and an operation schedule planning in a pig iron integrated steel plant having a pig iron making process and a steel making process.

[0002]

2. Description of the Related Art As the latest technology relating to an operation plan between a conventional ironmaking process and a steelmaking process, there is JP-A-6-172823. This disclosed method, that is, the demand quantity arranging time and the production quantity of the steelmaking process or the pig iron process on the hot metal demand side or the pig iron process on the supply side are functionalized for each work unit,
Also, the effect of hot metal demand in the steelmaking process on manufacturing costs is defined as a function for each work unit, and the combination of these functions minimizes the effect of the combination of hot metal supply methods for each work unit corresponding to hot metal demand on manufacturing costs. The method that adopts simply arranges the work as a certain evaluation function. Therefore, the equipment (conveyance) during the hot metal transportation caused by the work (interference), the work interference caused during the hot metal pretreatment work, the interference of the hot metal transportation means, the interference due to the total number of ladle and the hot metal component It was not possible to accurately evaluate constraints.

[0003]

In the conventional operation plan between the ironmaking process and the steelmaking process, the production management is performed separately. Therefore, the steelmaking process makes an operation plan according to the amount of hot metal supplied by the ironmaking process. It was a so-called passive operation. Therefore, in such a plan, we are wary of the interruption of the hot metal supply from the pig iron production process, and we have a method of holding an excess inventory in the steelmaking process, or on the contrary, inventory is out and we are forced to review the blowing operation plan, This caused troubles such as continuous casting breakage and deterioration of product quality.

In the conventional example as disclosed in Japanese Patent Application Laid-Open No. 6-172823, the plan is calculated backward from the blowing plan of the steelmaking process to the pigmaking process between steelmaking and pigmaking, but the operating time is the operating pattern. A highly accurate schedule is created because the values are simply added based on the simple condition from the function table of the time assigned separately, and the operation interference between cranes on the same lane and the operation interference due to simultaneous work are not considered. However, there was a problem that the number of man-hours for rescheduling increased as a result.

The present invention solves the above-mentioned problems found in the conventional method, and further comprises a method of hot metal distribution strategically combining the iron making process and the steel making process, and a blowing / hot metal pretreatment process of the steel making process. Also provided is a hot metal supply / demand management scheduling method for a pig iron production process and a hot metal supply / demand management for an integrated iron and steel plant that enables the planning of these operations.

[0006]

In order to achieve the above object, a hot metal supply and demand management scheduling method of the present invention is a method for planning a hot metal supply and demand management schedule between a steelmaking process and a hot metal production process of a pig iron integrated steel plant, (A) A step of calculating the demand amount and arrangement time of hot metal generated in any period of the steelmaking process for each work unit, and (b) a kind of hot metal required for each work unit generated in (a). And (c) calculating the number of treatments for each work unit that requires pre-hot metal pretreatment of the continuous casting process in the steelmaking process, and (d) for each blowing process unit of the steelmaking process. A step of calculating a pattern of a treatment process in which the demand hot metal does not require a preliminary hot metal pretreatment process and goes back from the blowing process to the hot metal production process,
(E) A step of calculating a pattern of a treatment process in which a demanded hot metal pretreatment process in the steelmaking process requires a preliminary hot metal pretreatment process, and the pattern of the treatment process is traced back from the blowing process to the hot metal production process, and (f) From the blowing process of the steelmaking process to the process of inventory management of the hot metal carried out from the pigmaking process, the process of going back to the upper process and simulating physical distribution,
(G) The process of calculating the demand amount of hot metal generated in the steelmaking process as a function of time based on the result of the logistics simulation, and (h) (f) the manufacturing cost incurred according to the work type of the pre-hot metal pretreatment process. The process of calculating for each unit, (i) (g) in the steelmaking process
And a step of calculating the amount of tapping metal in the tapping step of the pig iron making process as a function of the tapping time from the function of the time of the hot metal demand calculated by.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A hot metal supply / demand management schedule system of the present invention will be described with reference to FIG. The data processing function 3 extracts the data to be planned from the blowing plan database 1 in which the data of the blowing plan is stored, and adds the data-related data from the data table 2 to the blowing schedule information storage memory 4. The operation schedule is calculated by using the sending and distribution retroactive simulation execution function 5, the operation schedule check function 6 checks the result, and the input / output unit 7 displays the scheduling result.

As shown in FIG. 2, the operation flow is such that, in step 1, the data to be planned is extracted from the blowing plan database 1 and necessary data corresponding to the data from the specification data table 2 is obtained. The original data is extracted and read in the blowing schedule information storage memory 4, and in step 2, the input / output unit 7 is utilized to make the number of hot metal preliminary treatments,
Determine the throughput. Subsequently, in step 3, the retroactive scheduling of physical distribution is performed and the operation schedule is calculated. Then, in step 4, the result is checked, and in the case of NO, in step 5, the hot metal pretreatment specification values are changed, and the procedure is returned to step 2. In the case of OK, blast furnace tap allocation is performed in step 6, and subsequently, tapping scheduling is registered in step 7.

According to the present invention, the conditions of the blowing process of the steelmaking process, which is the demand side of the hot metal, are arranged, and the processes between the hot metal pretreatment process and the hot metal process, which are the upper processes, are carried out using a high-level simulation language. It is characterized in that the simulation is performed to obtain the order of the production process and the operation time of each processing process, and that the physical distribution simulation is a trace back simulation from the lower process to the upper process. In addition, by using a logistics simulation method that uses a high-level simulation language, it is possible to obtain the solution of the objective function without considering the combination of processing steps, and also consider the logistics interference that inevitably occurs during transportation. It enables rational operation between the ironmaking process and the steelmaking process.

[0010]

An embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 5, the hot metal from the blast furnace is put in a hot metal receiving ladle and sent to a steelmaking process by a hot metal cart. The hot metal sent to the steelmaking process is roughly classified into those that require preliminary pretreatment of the hot metal and those that do not, depending on the purpose of blowing in the converter process. Those that require pre-treatment of hot metal are transported from the area for managing the hot metal transported from the hot metal production process to the hot metal pre-treatment process, and after the treatment is completed,
Once again collected in one place, the hot metal suitable for the purpose of blowing is conveyed to the converter and blown.

The conventional hot metal supply and demand management in the ironmaking process and the steelmaking process is to formulate an operation plan in the form of the conditions of the ironmaking process or the supply of the lower steelmaking process.
It was a top-down production management method from top to bottom. However, in the present invention, from the casting conditions for each working unit of the casting process, which is the most end process in the steelmaking process on the demand side, the conditions of the blowing process traced back are first arranged, and the hot metal obtained from the conditions is further summarized. After the conditions of the pre-treatment process are obtained and the conditions of the blowing process and the conditions of the pre-treatment process are integrated and rearranged again, the molten iron demand conditions that are originally in the steelmaking process are rearranged, and then the upper-stage ironmaking process is operated. A method of planning conditions, that is, the upper process and the lower process were reversed, and the operation schedule was traced back to control production.

The system configuration of the present invention is as shown in FIG. 1, and the blowing plan database 1 has the continuous casting machine No. 1 as shown in Table 1. Different charge data, casting order,
Casting group No. , Order no. , Such as type code, casting time, casting amount, etc., and data of a casting plan created using another system is stored so as to satisfy the constraint conditions such as the composition of the steel type for continuous casting. Here, the continuous casting group No. Means that the same number is continuous casting, and when the number is changed, setup change work such as tundish exchange is involved in the continuous casting machine.

[0013]

[Table 1]

The specification data table 2 is data required to be added to the blowing plan data stored in the blowing plan database 1.

The data processing function 3 has a function of extracting the data to be planned from the blowing plan database 1, populating the data corresponding to the data from the specification data table 2 and expanding the data on the blowing schedule information storage memory 4. , Extract the created operation schedule from the memory 4,
It has a function of registering in the blowing plan database 1.

The blowing schedule information storage memory 4 has a function of receiving the plan target data processed by the data processing function 3 and calculating an operation schedule by using the distribution retroactive simulation execution function 5.

The logistics retroactive simulation execution function 5 is a system having a function capable of considering the interference of the crane, and uses a general-purpose system such as SLAM2.

The operation schedule check function 6 has a function of checking and evaluating the scheduling result.

The input / output unit 7 has an interface function with a system operator such as displaying a scheduling result and inputting scheduling conditions.

As shown in FIG. 2, the scheduling process control functions to realize the present invention, and the demand for the steelmaking process sent from the vidicon is determined by the following (1) to
The hot metal production control and operation schedule are planned by the method according to the step (8).

(1) Steelmaking Process Production Schedule For each production unit of the casting process, which is the final process in the steelmaking process, as the production schedule of the steelmaking process, (a) molten steel arrangement time in the final process, (b) molten pig iron demand, (C) Items such as product component standards are given by the upper vidicon. An example of the casting order database given in Table 1 is shown.

(2) Steelmaking process blowing plan Based on (1) (a) in the preceding paragraph, using a physical distribution simulation that traces from the casting process to the blowing process in a steelmaking plant, blowing for each work unit of the blowing process Get the start time. Table 2 shows an example of the blowing order database.

[0023]

[Table 2]

(3) Preliminary pretreatment calculation of hot metal The required amount of hot metal for preliminary hot metal pretreatment is calculated from the product component standard and the smelting process and product restrictions after the blowing process for each work unit of the blowing process in the steelmaking process. The number of times of processing and the type of processing are calculated.

(4) Calculation of distribution route of hot metal pre-pretreatment process Type of work for hot metal pre-treatment in demand hot metal for each work unit of steelmaking process is summarized in time series Type of pre-treatment of continuous hot metal The distribution route to the upper process is selected for each. Table 3 shows a data table for each pretreatment.

[0026]

[Table 3]

(5) Calculation of distribution route of hot metal pre-preliminary non-treatment process The time for arranging hot metal to be received by the blowing process does not correspond to the pre-treatment of hot metal generated in each working unit of the blowing process in the steelmaking process. As a function, the distribution route is selected toward the upper process.

(6) Simulation of traceability of physical distribution It is assumed that the hot metal demand generated for each work unit of the blowing process in the steelmaking process is recombined with the work unit of the preliminary pretreatment process, which requires the preliminary pretreatment process. , Those that occur in order of the blowing process that does not require prior preliminary treatment are arranged in time series. Those arranged in time series are expressed as a simulation order. The demand for hot metal for the order is linked to the simulation order on a one-to-one basis by the process described above. Further, it has, as route data, a processing route that goes to the upper process, that is, a processing procedure that is completely opposite to the so-called normal processing route. Based on this data, a high-level simulation language SLAM2 is used, and further a physical distribution retrospective simulation in which physical distribution interference between transport means such as a crane and a trolley can be controlled is performed.

(7) Time series of hot metal demand amount The demand amount of hot metal in units of minutes satisfying the conditions of the blowing process occurring in the steelmaking process can be obtained from the physical distribution simulation.

(8) Planning of Operation Plan From the physical distribution simulation, the tapping schedule in the pig making process, the hot metal pretreatment process in the steel making process, and the operation schedule of the transportation means such as the crane can be obtained. Table 4 shows an example of the scheduling result. FIG.
An example of an operation chart in the process shown in FIG.

[0031]

[Table 4]

[0032]

According to the embodiments of the present invention, the ironmaking process and the steelmaking process are strategically combined by the rational operation between the ironmaking process and the steelmaking process in consideration of the physical distribution interference at the time of transportation, and It is possible to plan the distribution method, the pre-treatment process of blowing and hot metal in the steelmaking process, the tapping process of the ironmaking process, and the operation plan of these.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a system applied to a hot metal supply and demand management schedule planning according to an embodiment of the present invention.

2 is a flowchart of the system shown in FIG.

FIG. 3 is an example of an operation chart according to the implementation of the present invention.

FIG. 4 is an explanatory view showing an example of a layout of a steelmaking factory portion of an integrated pig-iron mill.

FIG. 5 is a process flow of a steelmaking process in an integrated pig steel plant.

[Explanation of symbols]

 1 Blowing Plan Database 2 Specification Data Table 3 Data Processing Function 4 Memory for Blowing Schedule Information 5 Execution Function for Retrospecting Logistics 6 Operating Schedule Check Function 7 Input / Output Section

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Claims (1)

[Claims] 1. A method for planning a hot metal supply and demand management schedule between a steel making process and a pig iron making process of an integrated pig steel manufacturing plant,
(A) A step of calculating, for each work unit, the amount of hot metal demand and the arrangement time, which occur during an arbitrary period of the steelmaking process, and (b)
(A) A step of obtaining hot metal required for each work unit as a function of the kind of hot metal, and (c) The number of processing times for each work unit that requires preliminary hot metal pretreatment of a continuous casting step in the steelmaking process. And a step of calculating
(D) A step of calculating a pattern of treatment steps in which demanded hot metal for each blowing step of the steelmaking process, which does not require a preliminary hot metal pretreatment step, is traced back from the blowing step to the ironmaking step, and (e) The process of calculating the pattern of the treatment process in which the required hot metal pretreatment process in the blowing process of the steelmaking process, which requires the preliminary hot metal pretreatment process, is traced back from the blowing process to the ironmaking process, and (f) of the steelmaking process The process of inventory management of the hot metal carried out from the blowing process to the hot metal production process, the process of performing a physical distribution simulation that goes back to the upper process, and (g) the demand of the hot metal generated in the steelmaking process according to the result of the physical distribution simulation. For each work unit, the manufacturing cost incurred by the process calculated as a function and the work type of the pre-hot metal pretreatment process in (h) and (f) And (i) a step of calculating the amount of tapping metal in the tapping process of the pigmaking process as a function of tapping time from the function of the time of the hot metal demand calculated in (g) in the steelmaking process. A hot metal supply and demand management scheduling method characterized by the above.