Dynamic regulation and control method and system for'one-ladle-to-bottom 'operation mode of iron-steel interface

Abstract

The invention discloses a dynamic regulation and control method and system for a'one-ladle-to-bottom 'operation mode of an iron-steel interface, and the method comprises the steps: collecting the blast furnace side molten iron yield and steelmaking side molten iron consumption of the iron-steel interface, and the operation number of molten iron ladles, calculating the thrust and tensile force of the iron-steel interface, and converting the thrust and tensile force into the input rate and output rate of interface system operation; constructing a kinetic model of the ferritin material flow and a ladle turnover model; the production running rhythm of the blast furnace side and the steelmaking side is calculated through a ferritin material flow dynamic model, and the dynamic regulation and control relation between the ladle input and output rate and the interface ladle is determined; through a ladle turnover model, the difference value between the actual ladle operation input rate and the actual ladle operation output rate is calculated, the number and distribution changes of the ladles operated on a future interface are estimated, and the online operation number of the ladles is adjusted according to the set upper and lower limit values of empty ladles, so that the interface operation is more matched. By adopting the technical scheme, the model quantitatively describes dynamic characteristics of multi-input-multi-output ferritin material flow and ladle turnover, and optimizes a dynamic operation mechanism of an iron-steel interface.

Description

Technical Field

[0001] The present invention belongs to the technical field of steelmaking iron and steel interface control, and specifically relates to a dynamic control method and system for an iron-steel interface "one package to the end" operation mode. Background Art

[0002] As a typical process manufacturing industry, the steel industry has two types of process manufacturing methods: the blast furnace-converter long process and the electric furnace short process. China's steel manufacturing is mainly based on the long process, and its crude steel output accounts for more than 90%, which is the main source of CO2 emissions in the industry.

[0003] Applying process engineering ideas to optimize the material flow operation in the blast furnace-converter section, i.e., the iron-steel interface, is an important means for steel companies to save energy, reduce carbon emissions, and reduce costs and increase efficiency. Optimizing the operation of the iron-steel interface can reduce the temperature loss of molten iron during transportation, preserve the heat of the high-temperature molten iron obtained by carbon metallurgy as much as possible, and is conducive to the large-scale consumption of scrap steel in the converter, which is of great significance to reducing carbon emissions.

[0004] As an efficient "iron-steel interface" technology, the "one-bag-to-the-end" model has been adopted by many newly built steel companies. This model uses the same molten iron ladle to complete multiple operations such as blast furnace iron tapping, molten iron transportation, molten iron desulfurization, and converter iron addition, effectively reducing the molten iron temperature loss of the traditional ladle pouring model. Existing research has formed a relatively systematic method in terms of interface layout optimization design, molten iron temperature drop law analysis and prediction around the "one-bag-to-the-end" model; in the fields of macroscopic operation analysis and simulation optimization of ferrous material flow, interface transportation and steel plant scheduling, it provides a theoretical basis for improving interface operation efficiency. However, existing research mostly focuses on macroscopic or static analysis, and lacks a systematic revelation of the dynamic matching relationship between the input and output of ferrous material flow in the ironmaking-steelmaking process. In addition, since some steel companies use multiple types of ladles, existing results still have certain limitations in actual production.

[0005] At present, the dynamic management of interface ladles mainly includes two situations:

[0006] One is offline operation when the ladle needs maintenance;

[0007] Secondly, when the steelmaking process fails or the pouring is stopped, temporary buffering of the molten iron can be achieved by baking the ladles in the on-line masonry room.

[0008] However, the current management strategy of enterprises has not fully considered the needs of material flow matching and lacks a mechanism to systematically control the number of ladles. This deficiency not only limits the further improvement of interface operation efficiency, but also causes energy waste due to the continuous baking of ladles. Summary of the invention

[0009] The purpose of the present invention is to provide a dynamic control method and system for the "one package to the end" operation mode of the iron-steel interface, so as to optimize the dynamic operation mechanism of the iron-steel interface.

[0010] In order to achieve the above-mentioned purpose, the basic scheme of the present invention is: a dynamic control method for the "one package to the end" operation mode of the iron-steel interface, comprising the following steps:

[0011] Collect the number of molten iron tappings and outputs on the blast furnace side of the iron-steel interface, the number of molten iron and iron furnaces and consumption on the steelmaking side, and the number of ladles running on the interface, calculate the thrust and pull of the iron-steel interface, and use the system dynamics method to convert the thrust into the input rate of the iron-steel interface system operation, and convert the pull into the output rate of the iron-steel interface system operation;

[0012] Construct a kinetic model of ferrous material flow and a ladle turnover model;

[0013] The production operation rhythm of the blast furnace side and the steelmaking side is calculated through the ferrite material flow dynamics model, and the input rate and output rate of the molten iron ladle, as well as the dynamic control relationship with the number of molten iron ladles at the interface, are determined;

[0014] Through the ladle turnover model, the number and distribution changes of ladles on the future interface are calculated under the condition of the actual difference between the input and output rates of the ladle. Combined with the operating status of the ladle, the number of empty ladles on the upper and lower lines of the ladle are adjusted according to the set upper and lower limits of the empty ladles to make the interface operation match.

[0015] The working principle and beneficial effects of this basic scheme are as follows: the system dynamics model of this technical scheme calculates the future distribution of the number of ladles based on the rate difference of molten iron input on the blast furnace side and output on the steelmaking side at the iron-steel interface, and determines the increase or decrease of the amount of molten iron in transit (the number of heavy ladles) at the interface based on the ladle turnover model to adjust the number of ladles on and off the line.

[0016] Since the total amount of interface ladles remains stable over a period of time, the increase or decrease in the number of heavy ladles will affect the change in the number of empty ladles. The number of ladles to be regulated on the upper and lower lines is determined by comparing the current number of empty ladles with the set upper and lower limits of the empty ladle operation.

[0017] On the basis of qualitative analysis of the interface operation law, combined with the state and quantity distribution of the ladles and the rate changes on the blast furnace side and the steelmaking side, the ladles are quantitatively operated on the upper and lower lines based on the flow rate difference and the set upper and lower limits of the ladles to optimize the interface operation. Furthermore, the iron output of the blast furnace is the thrust source of the material flow operation, and the blast furnace iron production is used as the thrust; the continuous casting tension is achieved by the furnace corresponding to the continuous casting pouring plan, and the tension source of the iron-steel interface is converted into the steel output corresponding to the furnace of the steelmaking steelmaking plan. The thrust and tension of the iron-steel interface are calculated as:

[0018]

[0019]

[0020] in, For thrust, is the pulling force; V is the effective volume of the blast furnace; I is the number of blast furnaces; η i is the utilization coefficient of the i-th blast furnace; t BF is the blast furnace working time domain; t i and t i ′ are the start time and end time of the i-th blast furnace working time domain respectively; dτ is the time differential; J is the total number of steel plants; j is the steel plant number; B is the total number of converters; b is the converter number; Q lalde is the amount of iron added in this furnace; t BOF is the converter working time domain; t b and t ′ b are the start time and end time of the working time domain of the bth converter respectively; dτ is the time differential.

[0021] Furthermore, the system dynamics method is used to construct the dynamic model of the ferrous material flow, and its level equation is described as:

[0022]

[0023] Among them, t i,m,start represents the start time of the mth iron production of the i-th blast furnace; t i,m,end Indicates the end time of the mth iron batch of the i blast furnace; Q end Q is the amount of molten iron in transit at the interface at the end of the iron run; start is the amount of molten iron in transit at the interface at the start of the iron run; R in (τ) represents the total rate of iron entering the interface from i blast furnaces; R out (τ) represents the sum of the iron addition rates of the converters in J steel plants; dτ is the time differential;

[0024] The input rate of each blast furnace is derived from the ferrous material flow quality, iron time or iron ladle type and quantity produced in the iron time of the blast furnace; the output rate of each steelmaking is derived from the ferrous material flow quality or the number of iron ladles consumed by multiple heats of several converters of the steelmaking in the iron time period, specifically:

[0025]

[0026]

[0027] in, is the first iron receiving quality of k-type ladle in the m-th tapping of blast furnace i; is the second iron receiving mass when the k-type ladle is the last ladle in the m-th tapping; t i,m,start is the start time of the iron round; t i,m,end is the iron batch end time, and its difference is the blast furnace iron batch time; is the quality of molten iron from k type ladle at the nth iron addition of b converter in j steel plant within the corresponding iron-making time period, i is the blast furnace number, m is the iron-discharging times number, k is the ladle type number, j is the steel plant number, b is the converter number, n is the iron-adding times number, I is the total number of blast furnaces, M is the total number of iron-discharging times, K is the total number of ladle types, J is the total number of steel plants, B is the total number of converters, and N is the total number of iron additions.

[0028] In some steel enterprises, the iron-steel interface presents a typical multi-input-multi-output system structure, which comprehensively obtains the push and pull forces and more realistically reflects the dynamic characteristics of the system.

[0029] The system dynamics model constructed from the perspective of ferrous material flow provides a reference for optimizing interface operation and adjusting the rhythm of steelmaking production.

[0030] further,

[0031] Construct a ladle turnover model, calculate the production operation rhythm of the blast furnace side and the steelmaking side through the ferrous material flow dynamics model, and determine the relationship between the ladle input and output rate and the dynamic regulation of the interface ladle:

[0032] The ladle turnover model distinguishes the types and states of ladles, and the mathematical description of the number of heavy ladles is:

[0033]

[0034] The mathematical description of the number of empty packets is:

[0035]

[0036] Among them, t i,m,start is the start time of the iron round; t i,m,end is the end time of the iron run, and the difference is the blast furnace iron run time. is the number of k-type repeated packets at the end of the iron cycle, The number of k-type repeated packets at the beginning of the iron cycle; is the number of k-type empty packets at the end, is the number of empty packets of type k at the beginning; N ladle,end is the total amount of k-type ladles at the end; is the k-type heavy package generation rate on the blast furnace side during the iron-time, is the consumption rate of k-type heavy packages on the steelmaking side during the iron-time; is the k-type empty packet generation rate within the iron time, is the consumption rate of k-type empty packets within the iron time;

[0037] t end Total amount of hot metal ladle for:

[0038]

[0039] Through statistical analysis and system dynamics methods, the level equation for dynamic analysis of iron-steel interface is clarified, providing a quantitative guidance method for the operation of molten iron ladle on and off line.

[0040] Further, the upper and lower limits of the ladle are regulated based on the difference between the ladle input rate and the ladle output rate and the number of ladles on the current interface and the set upper and lower limits of the ladle;

[0041] According to the difference between the actual ladle input rate and the ladle output rate, as well as the ratio of empty and heavy ladle on the interface, the ladle up and down line and ladle turnover are adjusted, and the ladle input-output rate within the specified time range is calculated in real time.

[0042] The operation of the ladle on and off the line is not dynamically regulated based on the matching degree of the interface material flow, but mainly because the ladle needs maintenance. Dynamically adjust the reasonable number of ladles at the iron-steel interface to improve the interface operation efficiency.

[0043] Furthermore, the heavy ladle turnover process consists of the generation and consumption of heavy ladle, and the generation rate of heavy ladle is described as the actual number of ladles that receive the blast furnace ferrous material flow:

[0044]

[0045] in, Represents the number of iron ladles of type k in blast furnace i;

[0046] The heavy ladle consumption rate is described as the number of iron ladle exchanged on the steelmaking side in the same period.

[0047]

[0048] in, represents the number of k-type iron ladles in converter b of steel plant j;

[0049] The empty bag turnover process consists of empty bag generation and empty bag consumption. In contrast to the life cycle of heavy bags, the empty bag generation rate is described as the number of empty bags formed by heavy bags added with iron in the converter and the number of empty bags put online from the masonry room within the iron-batch time.

[0050]

[0051] in, represents the number of k-type iron ladles in converter b of steel plant j; It indicates the number of k-type ladles on the line in the masonry room;

[0052] The consumption rate of empty bags is described as the number of heavy bags formed after the empty bags are connected to the blast furnace and the number of empty bags unloaded from the masonry room:

[0053]

[0054] in, Represents the number of iron ladles of type k in blast furnace i; Indicates the number of k-type ladles offline in the masonry room.

[0055] The system input rate and system output rate are obtained from the perspective of ladle turnover, revealing the dynamic relationship between multi-input and multi-output ferrous material flow and ladle turnover, achieving dynamic matching of the number of ladles and production rhythm, improving interface operation efficiency and providing new ideas for interface operation optimization and regulation.

[0056] Furthermore, through the ladle turnover model, the appropriate output rate of the steelmaking side is determined according to the input rate of the blast furnace, and the number of ladles in the future interface is calculated under the actual rate difference. The upper and lower limits of the ladle are adjusted according to the set upper and lower limits of the empty ladle to match the interface operation. The specific steps are as follows:

[0057] S1, reading the actual performance data of the blast furnace side and the converter side and the distribution of the number of ladles on the interface during the iron-making period;

[0058] S2, calculate the blast furnace input rate and steel output rate during this iron period through the kinetic model of ferrous material flow;

[0059] S3, calculating the number distribution of ladles in the next period through the difference of ladle input-ladle output consumption rate and the ladle turnover model;

[0060] S4, comparing the calculated distribution of the number of empty ladles in the number of ladles with the set upper and lower limits of the number of empty ladles;

[0061] S5, by comparing with the upper and lower limits of the empty ladle, determine the adjustment of the upper and lower limits of the molten iron ladle, where the upper and lower limits are set based on the safe iron supply quantity of the enterprise's blast furnace and the long-term operating conditions.

[0062] Adjust the upper and lower lines of the molten iron ladle according to the set upper and lower limits of the empty ladle to make the interface operation match and realize dynamic regulation of the iron-steel interface.

[0063] The present invention also provides a dynamic control system for the iron-steel interface based on the "one ladle to the end" mode, comprising a data acquisition module and a processing module, wherein the data acquisition module is used to collect the turnover operation quantity and turnover efficiency of the iron ladle at the iron-steel interface, and the output end of the data acquisition module is connected to the input end of the processing module;

[0064] The processing module executes the method of the present invention to dynamically control the iron-steel interface.

[0065] The system has a simple structure and constructs a dynamic model of molten iron input-output and ladle turnover to dynamically control the iron-steel interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 It is a schematic flow chart of the dynamic control method of the present invention for the "one package to the end" operation mode of the iron-steel interface;

[0067] Figure 2 It is a system dynamics flow chart of the dynamic control method of the present invention for the "one package to the end" operation mode of the iron-steel interface. DETAILED DESCRIPTION

[0068] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0069] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0070] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0071] The present invention discloses a dynamic control method for the "one package to the end" operation mode of the iron-steel interface, such as Figure 1 As shown, the following steps are included:

[0072] Collect the molten iron output on the blast furnace side of the iron-steel interface, the molten iron consumption on the steelmaking side, and the number of molten iron ladle operations (specifically, the number of molten iron tappings and molten iron output on the blast furnace side, the number of molten iron added to iron furnaces on the steelmaking side, the molten iron consumption on the steelmaking side, the number of molten iron ladle operations, time, ladle type, ladle times and other information as well as the parameter information required in the calculation process of the present invention can be obtained from the production information system database of the enterprise, and the blast furnace side iron connection and steelmaking side iron adding data can be obtained through the molten iron ladle tracking system), calculate the thrust and pull of the iron-steel interface, and use the system dynamics method to convert the thrust into the input rate of the iron-steel interface system operation, and convert the pull into the output rate of the iron-steel interface system operation;

[0073] Construct the kinetic model of ferrite material flow and the ladle turnover process model;

[0074] The production operation rhythm of the blast furnace side and the steelmaking side is calculated through the ferrite material flow dynamics model, and the input rate and output rate of the molten iron ladle, as well as the dynamic control relationship with the number of molten iron ladles on the interface are determined. Specifically, the respective production rhythms are determined through the distribution of blast furnace input rate and steelmaking output rate, and the input rate-output rate is calculated, and its image distribution is plotted.

[0075] Through the ladle turnover model, the number and distribution changes of ladles at the future iron-steel interface are calculated under the condition of the actual difference between the input and output rates of the ladle. Combined with the operating status of the ladle, the number of empty ladles on the upper and lower lines of the ladle are adjusted according to the set upper and lower limits of the empty ladles to make the interface operation match.

[0076] Through the ladle turnover model, the appropriate output rate of the steelmaking side is determined according to the input rate of the blast furnace (in the present embodiment, the appropriate output rate of the steelmaking side is that the blast furnace input rate is equal to the steelmaking output rate, that is, the blast furnace input rate and the steelmaking output rate match each other or the difference is within the preset range and the difference is positive or negative, otherwise the number of heavy or empty ladle will continue to increase, making the ratio of heavy ladle and empty ladle on the interface unbalanced), and the distribution of the number of ladles on the interface in the future under the actual difference between the input and output rates of the ladle is calculated (the number of ladles operating on the interface is regulated by the upper and lower line ladles according to the interface rate difference), combined with the operating status of the ladle, and the number of empty ladles on the upper and lower lines of the ladle is adjusted according to the set upper and lower limits of the empty ladle, so that the interface operation matches, wherein the upper and lower limits are set according to the number of safe iron connections of the enterprise's blast furnace and the long-term operating conditions, so that the interface input and output match.

[0077] In this embodiment, the number of ladles is calculated by a dynamic model of the turnover of ladles, and the specific process is as follows:

[0078] ① The number of heavy ladles at the next moment is determined based on the number of heavy ladles at the current moment, as well as the number of heavy ladles input into the blast furnace and the number of heavy ladles output from the steelmaking during this period; ② The number of empty ladles at the next moment is determined based on the number of empty ladles at the current moment, as well as the number of empty ladles input into the masonry room and the number of empty ladles input into the steelmaking during this period; the number of empty ladles output from the blast furnace and the number of empty ladles offline from the masonry room. If the number of empty ladles is insufficient, the ladles are put online through the masonry room, and if the number of empty ladles is too large, the ladles are taken offline.

[0079] Since the production of blast furnaces and converters are both rigid links, the steelmaking output rate (production operation rhythm) is adjusted by calculating and analyzing the production status of the blast furnace, understanding the availability of molten iron for future steelmaking, and analyzing the rate difference at both ends to adjust the number of ladles at the interface (calculated through the ladle turnover model).

[0080] The essence of the dynamic system of the iron-steel interface can be summarized as the molten iron input on the blast furnace side and the molten iron output on the steelmaking side, as well as the amount of molten iron in transit regulated by the input-output rate. In the "one ladle to the end" mode, the dynamic model of the ferrous material flow can be further transformed into the corresponding ladle state and its quantity change process, and the interface operation state can be adjusted through the dynamic on-off operation of the ladle.

[0081] In a preferred embodiment of the present invention, the upper and lower limits of the ladle are regulated based on the difference between the ladle input rate and the ladle output rate and the current number of ladles on the interface and the set upper and lower limits of the ladle;

[0082] According to the difference in actual ladle input rate, ladle output rate, and the ratio of empty ladle to heavy ladle on the interface, the ladle upper and lower lines and ladle turnover are adjusted, and the input-output rate within the designated time range is calculated in real time. This can be accurate to a smaller time range, making dynamic regulation more precise.

[0083] In a preferred embodiment of the present invention, the iron output of the blast furnace is the thrust source of the material flow operation, and the iron output of the blast furnace is used as the thrust; the continuous casting pulling force is achieved by the furnace corresponding to the continuous casting pouring plan, and the pulling force source of the iron-steel interface is converted into the steel output of the furnace corresponding to the steelmaking and steel-making plan. The thrust and pulling force of the iron-steel interface are calculated as:

[0084]

[0085]

[0086] in, For thrust, is the pulling force; V is the effective volume of the blast furnace; I is the number of blast furnaces; η i is the utilization coefficient of the i-th blast furnace; t BF is the blast furnace working time domain; t i and t i′ are the start time and end time of the i-th blast furnace working time domain respectively; dτ is the time differential; J is the total number of steel plants; j is the steel plant number; B is the total number of converters; b is the converter number; Q lalde is the amount of iron added in this furnace; t BOF is the converter working time domain; t b and t ′ b are the start time and end time of the working time domain of the bth converter respectively; dτ is the time differential.

[0087] During the blast furnace iron-tapping process, the system's input rate comes from the quality of the ferrous material flow in the blast furnace iron batch, the iron-tapping time or the type and quantity of the molten iron ladle, etc. The combination of these factors forms the "blast furnace thrust" that describes the blast furnace's iron-tapping capacity on a macro scale.

[0088] During the converter iron addition process on the steelmaking side, the system's output rate is derived from the quality of the ferrous material flow in the converter heat, the iron addition time or the number of ladles, etc. The combination of these factors constitutes the "converter pull" that describes the steelmaking iron addition capacity at a macro level.

[0089] In a preferred embodiment of the present invention, at the iron-steel interface, the amount of molten iron in transit is a key indicator for evaluating the operation of the interface, and its change is directly affected by the iron tapping rate of the blast furnace and the iron addition rate of the steel mill.

[0090] The level equation describes the dynamic change process of the amount of molten iron in transit under the fluctuation of the input rate of the blast furnace side and the output rate of the steelmaking side. Using the system dynamics method, a dynamic model of the ferrous material flow is constructed, and its level equation is described as:

[0091]

[0092] Among them, t i,m,start represents the start time of the mth iron production of the i-th blast furnace; t i,m,end Indicates the end time of the mth iron batch of the i blast furnace; Q end Q is the amount of molten iron in transit at the interface at the end of the iron run; start is the amount of molten iron in transit at the interface at the start of the iron run; R in (τ) represents the total rate of iron entering the interface from i blast furnaces; R out (τ) represents the sum of the iron addition rates of the converters in J steel plants; dτ is the time differential;

[0093] The input rate of each blast furnace is derived from the ferrous material flow quality, iron time or iron ladle type and quantity produced in the iron time of the blast furnace; the output rate of each steelmaking is derived from the ferrous material flow quality or the number of iron ladles consumed by multiple heats of several converters of the steelmaking in the iron time period, specifically:

[0094]

[0095]

[0096] in, is the first iron receiving quality of k-type ladle in the m-th tapping of blast furnace i; is the second iron receiving mass when the k-type ladle is the last ladle in the m-th tapping; t i,m,start is the start time of the iron round; t i,m,end is the iron batch end time, and its difference is the blast furnace iron batch time; is the quality of molten iron from k type ladle at the nth iron addition of b converter in j steel plant within the corresponding iron-making time period, i is the blast furnace number, m is the iron-discharging times number, k is the ladle type number, j is the steel plant number, b is the converter number, n is the iron-adding times number, I is the total number of blast furnaces, M is the total number of iron-discharging times, K is the total number of ladle types, J is the total number of steel plants, B is the total number of converters, and N is the total number of iron additions.

[0097] In a preferred embodiment of the present invention, the system dynamics model constructed from the perspective of ferrous material flow takes the input and output rate of the actual ferrous material flow as the core, providing an effective basis for adjusting the rhythm of steelmaking production. In the "one ladle to the end" mode, the dynamics model can be further converted into a description of the state and quantity changes of the ladle, thereby providing a means to optimize the interface control from the perspective of the ladle.

[0098] The state and quantity of the interface ladle change with the blast furnace iron output rate and the steel mill iron addition rate. If the input and output rates are not reasonably matched, the organizational structure of the interface ladle will change:

[0099] If the rate on the blast furnace side is greater than the rate on the steelmaking side, the proportion of heavy ladles on the interface will increase, and the amount of molten iron in transit will increase. If the number of empty ladles cannot meet the blast furnace's iron demand at this time, ladles will need to be put online;

[0100] If the steelmaking rate is greater than the rate on the blast furnace side, the number of empty bags on the interface will increase, and the excess empty bags will affect the interface operation efficiency. Therefore, the steelmaking rate should be adjusted and the empty bags should be taken offline immediately.

[0101] The system dynamics model calculates the future distribution of ladles based on the rate difference between the blast furnace input and the steelmaking output at the iron-steel interface, and adjusts the number of ladles on and off the line based on the ladle turnover model to determine the increase or decrease in the amount of molten iron in transit (the number of heavy ladles) at the interface.

[0102] Construct a ladle turnover model, calculate the production operation rhythm of the blast furnace side and the steelmaking side through the ferrous material flow dynamics model, and determine the relationship between the ladle input and output rate and the dynamic regulation of the interface ladle:

[0103] The ladle turnover model distinguishes the types and states of ladles, and the mathematical description of the number of heavy ladles is:

[0104]

[0105] The mathematical description of the number of empty packets is:

[0106]

[0107] Among them, t i,m,start is the start time of the iron round; t i,m,end is the end time of the iron run, and the difference is the blast furnace iron run time. is the number of k-type repeated packets at the end of the iron cycle, The number of k-type repeated packets at the beginning of the iron cycle; is the number of k-type empty packets at the end, is the number of empty packets of type k at the beginning; N ladle,end is the total amount of k-type ladles at the end; is the k-type heavy package generation rate on the blast furnace side during the iron-time, is the consumption rate of k-type heavy packages on the steelmaking side during the iron-time; is the k-type empty packet generation rate within the iron time, is the consumption rate of k-type empty packets within the iron time;

[0108] t end Total amount of hot metal ladle for:

[0109]

[0110] In a preferred embodiment of the present invention, the heavy ladle turnover process consists of the generation and consumption of heavy ladle, and the generation rate of heavy ladle is described as the actual number of ladles that receive the blast furnace ferrous material flow:

[0111]

[0112] in, Represents the number of iron ladles of type k in blast furnace i;

[0113] The heavy ladle consumption rate is described as the number of iron ladle exchanged on the steelmaking side in the same period.

[0114]

[0115] in, represents the number of k-type iron ladles in converter b of steel plant j;

[0116] The empty bag turnover process consists of empty bag generation and empty bag consumption. In contrast to the life cycle of heavy bags, the empty bag generation rate is described as the number of empty bags formed by heavy bags added with iron in the converter and the number of empty bags put online from the masonry room within the iron-batch time.

[0117]

[0118] in, represents the number of k-type iron ladles in converter b of steel plant j; It indicates the number of k-type ladles on the line in the masonry room;

[0119] The consumption rate of empty bags is described as the number of heavy bags formed after the empty bags are connected to the blast furnace and the number of empty bags unloaded from the masonry room:

[0120]

[0121] in, Represents the number of iron ladles of type k in blast furnace i; Indicates the number of k-type ladles offline in the masonry room.

[0122] In a preferred embodiment of the present invention, the ladle turnover model is used to determine the appropriate output rate of the steelmaking side according to the input rate of the blast furnace, and the number distribution of ladles in the future interface is calculated under the condition of the difference between the actual ladle input and output rates, and the upper and lower lines of the ladle are adjusted according to the set upper and lower limits of the empty ladle to match the interface operation. The specific steps are as follows:

[0123] S1, read the actual performance data of the blast furnace side and the converter side and the distribution of the number of interface ladles during the iron-making period (which can be obtained from the production information system database of the enterprise);

[0124] S2, calculate the blast furnace input rate and steel output rate during this iron period through the kinetic model of ferrous material flow;

[0125] S3, calculating the number distribution of ladles in the next period through the difference between the ladle input and ladle output rates and the ladle turnover model;

[0126] S4, comparing the calculated distribution of the number of empty ladles in the number of ladles with the set upper and lower limits of the number of empty ladles;

[0127] S5, by comparing with the upper and lower limits of the empty ladle, determine the adjustment of the upper and lower limits of the molten iron ladle, where the upper and lower limits are set based on the safe iron supply quantity of the enterprise's blast furnace and the long-term operating conditions.

[0128] The core characteristics of the dynamic system of the iron-steel interface can be summarized as the molten iron input on the blast furnace side and the molten iron output on the steelmaking side, as well as the amount of molten iron in transit at the interface affected by the input and output. In the "one-bag-to-the-end" mode, the dynamic characteristics of the ferrous material flow can be specifically manifested in the distribution and quantity changes of empty bags and heavy bags.

[0129] By analyzing the dynamic change process of the ladle, the operation behavior and characteristics of the iron-steel interface dynamic system can be intuitively revealed and predicted. According to the system operation logic, the system dynamic flow diagram can be constructed, such as Figure 2 shown.

[0130] Based on the input-output rate difference and the change in the ratio of empty and heavy ladles at the interface, consider whether the ladle needs to be moved online or offline.

[0131] When the rates are matched, the number and proportion of interface ladles are relatively stable and do not require frequent intervention;

[0132] When the number of empty ladles is insufficient or the amount of molten iron in transit rises to a critical value, empty ladles should be put online in time to meet the blast furnace's iron demand;

[0133] When there are too many empty ladles, the excess ladles can be taken offline appropriately to reduce unnecessary space pressure and increase the daily turnover rate of the ladles; at the same time, the rhythm of steelmaking production can be adjusted to achieve rate matching on both sides.

[0134] The present invention also provides a dynamic control system for the iron-steel interface based on the "one ladle to the end" mode, comprising a data acquisition module and a processing module. The data acquisition module is used to collect the turnover operation quantity and turnover efficiency of the iron ladle at the iron-steel interface, and the output end of the data acquisition module is electrically connected to the input end of the processing module. The processing module executes the method described in the present invention to perform dynamic control of the iron-steel interface.

[0135] The present invention optimizes the iron-steel interface and can utilize the heat resources of blast furnace carbon metallurgy to achieve a higher proportion of scrap steel addition. The number of ladles is dynamically regulated by the push-pull forces at both ends of the interface. Although the overall operation is relatively stable, changes in the rhythm of blast furnace iron tapping and converter iron exchange will cause fluctuations in the amount of molten iron in transit. By dynamically adjusting the number of ladles and improving the turnover efficiency of the ladles, the temperature drop of molten iron can be effectively reduced.

[0136] The core of the optimization of the dynamic system of the iron-steel interface lies in achieving a dynamic balance between the molten iron input on the blast furnace side and the molten iron output on the steelmaking side. The essence of the dynamic system can be summarized as the molten iron input on the blast furnace side and the molten iron output on the steelmaking side. Its level is the amount of molten iron in transit. The system dynamics model constructed from the perspective of ferrous material flow provides a reference for optimizing interface operation and adjusting the rhythm of steelmaking production. In the "one ladle to the end" mode, the dynamic model is further transformed into a description of the state and quantity changes of the ladle, expanding the possibility of implementing interface regulation from the perspective of the ladle.

[0137] Through statistical analysis and system dynamics methods, the level equation for the dynamic analysis of the iron-steel interface and the calculation formula for the input rate of blast furnace iron and the output rate of converter iron are clarified. The model reveals the dynamic relationship between the multi-input and multi-output ferrous material flow and the turnover of the ladle, providing a quantitative guidance method for the online and offline operations of the ladle.

[0138] The system dynamics model can effectively improve the operating efficiency of the ladle. Compared with the traditional manual experience control, the model realizes the dynamic matching of the number of ladles and the production rhythm, improves the interface operation efficiency and provides a new idea for the optimization and control of the interface operation.

[0139] The quantitative analysis of the dynamic operation of the iron-steel interface can provide important data support and theoretical basis for the optimization of blast furnace under-furnace bagging, interface locomotive scheduling optimization, iron-steel interface material flow matching and coordination of steel plant production rhythm.

[0140] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0141] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A dynamic control method for the "one package to the end" operation mode of the iron-steel interface, characterized in that: The steps include: Collect the number of molten iron tappings and outputs on the blast furnace side of the iron-steel interface, the number of molten iron and iron furnaces and consumption on the steelmaking side, and the number of ladles running on the interface, calculate the thrust and pull of the iron-steel interface, and use the system dynamics method to convert the thrust into the input rate of the iron-steel interface system operation, and convert the pull into the output rate of the iron-steel interface system operation; Construct a kinetic model of ferrous material flow and a ladle turnover model; The production operation rhythm of the blast furnace side and the steelmaking side is calculated through the ferrite material flow dynamics model, and the input rate and output rate of the molten iron ladle, as well as the dynamic control relationship with the number of molten iron ladles at the interface, are determined; Through the ladle turnover model, the number and distribution changes of ladles at the iron-steel interface are calculated when the actual difference between the input and output rates of the ladle is considered. Combined with the operating status of the ladle and according to the set upper and lower limits of the empty ladle, the number of empty ladles on the upper and lower lines of the ladle is adjusted to match the interface operation.

2. The dynamic control method for the "one package to the end" operation mode of the iron-steel interface according to claim 1 is characterized in that: Calculate the thrust and pull at the iron-steel interface as: in, For thrust, is the pulling force; V is the effective volume of the blast furnace; I is the number of blast furnaces; η i is the utilization coefficient of the i-th blast furnace; t BF is the blast furnace working time domain; t i and t i ′ are the start time and end time of the i-th blast furnace working time domain respectively; dτ is the time differential; J is the total number of steel plants; j is the steel plant number; B is the total number of converters; b is the converter number; Q lalde is the amount of iron added in this furnace; t BOF is the converter working time domain; t b and t ′ b are the start time and end time of the working time domain of the bth converter respectively; dτ is the time differential.

3. The dynamic control method for the "one package to the end" operation mode for the iron-steel interface as claimed in claim 2 is characterized in that: The system dynamics method is used to construct the dynamic model of ferrous material flow, and its level equation is described as: Among them, t i,m,start represents the start time of the mth iron production of the i-th blast furnace; t i,m,end Indicates the end time of the mth iron batch of the i blast furnace; Q end Q is the amount of molten iron in transit at the interface at the end of the iron run; start is the amount of molten iron in transit at the interface at the start of the iron run; R in (τ) represents the total rate of iron entering the interface from i blast furnaces; R out (τ) represents the sum of the iron addition rates of the converters in J steel plants; dτ is the time differential; The input rate of each blast furnace is derived from the ferrous material flow quality, iron time or iron ladle type and quantity produced in the iron time of the blast furnace; the output rate of each steelmaking is derived from the ferrous material flow quality or the number of iron ladles consumed by multiple heats of several converters of the steelmaking in the iron time period, specifically: in, is the first iron receiving quality of k-type ladle in the m-th tapping of blast furnace i; is the second iron receiving mass when the k-type ladle is the last ladle in the m-th tapping; t i,m,start is the start time of the iron round; t i,m,end is the iron batch end time, and its difference is the blast furnace iron batch time; is the quality of molten iron from k type ladle at the nth iron addition of b converter in j steel plant within the corresponding iron-making time period, i is the blast furnace number, m is the iron-discharging times number, k is the ladle type number, j is the steel plant number, b is the converter number, n is the iron-adding times number, I is the total number of blast furnaces, M is the total number of iron-discharging times, K is the total number of ladle types, J is the total number of steel plants, B is the total number of converters, and N is the total number of iron additions.

4. The dynamic control method for the "one package to the end" operation mode for the iron-steel interface as claimed in claim 1 is characterized in that: Construct a ladle turnover model, calculate the production operation rhythm of the blast furnace side and the steelmaking side through the ferrous material flow dynamics model, and determine the input rate and output rate of the ladle, as well as the dynamic regulation relationship with the number of interface ladles: The ladle turnover model distinguishes the types and states of ladles, and the mathematical description of the number of heavy ladles is: The mathematical description of the number of empty packets is: Among them, t i,m,start is the start time of the iron round; t i,m,end is the end time of the iron run, and the difference is the blast furnace iron run time. is the number of k-type repeated packets at the end of the iron cycle, The number of k-type repeated packets at the beginning of the iron cycle; is the number of k-type empty packets at the end, is the number of empty packets of type k at the beginning; N ladle,end is the total amount of k-type ladles at the end; is the k-type heavy package generation rate on the blast furnace side during the iron-time, is the consumption rate of k-type heavy packages on the steelmaking side during the iron-time; is the k-type empty packet generation rate within the iron time, is the consumption rate of k-type empty packets within the iron time; t end Total amount of hot metal ladle for:

5. The dynamic control method for the "one package to the end" operation mode for the iron-steel interface as claimed in claim 1 is characterized in that: The difference between the ladle input rate and the ladle output rate is used to control the ladle upper and lower lines based on the current interface ladle quantity and the set ladle upper and lower limits; According to the difference in actual ladle input rate, ladle output rate, and the ratio of empty ladle to heavy ladle on the interface, the upper and lower lines of the ladle and the ladle turnover are adjusted, and the ladle input-output rate within the designated time range is calculated in real time.

6. The dynamic control method for the "one package to the end" operation mode of the iron-steel interface as claimed in claim 5 is characterized in that: The heavy ladle turnover process consists of the generation and consumption of heavy ladle. The generation rate of heavy ladle is described as the actual number of ladles that receive the ferrous material flow of the blast furnace: in, Represents the number of iron ladles of type k in blast furnace i; The heavy ladle consumption rate is described as the number of iron ladle exchanged on the steelmaking side in the same period. in, represents the number of k-type iron ladles in converter b of steel plant j; The empty bag turnover process consists of empty bag generation and empty bag consumption. In contrast to the life cycle of heavy bags, the empty bag generation rate is described as the number of empty bags formed by heavy bags added with iron in the converter and the number of empty bags put online from the masonry room within the iron-batch time. in, represents the number of k-type iron ladles in converter b of steel plant j; It indicates the number of k-type ladles on the line in the masonry room; The consumption rate of empty bags is described as the number of heavy bags formed after the empty bags are connected to the blast furnace and the number of empty bags unloaded from the masonry room: in, Represents the number of iron ladles of type k in blast furnace i; Indicates the number of k-type ladles offline in the masonry room.

7. The dynamic control method for the "one package to the end" operation mode of the iron-steel interface according to claim 1 is characterized in that: Through the ladle turnover model, the number and distribution changes of ladles at the iron-steel interface are calculated under the actual difference between the input and output rates of the ladles. Combined with the operation status of the ladles and according to the set upper and lower limits of the empty ladles, the number of empty ladles on the upper and lower lines of the ladles is adjusted to match the interface operation. The specific steps are as follows: S1, reading the actual performance data of the blast furnace side and the converter side and the number distribution of the interface ladles during the iron-making period; S2, calculate the blast furnace input rate and steel output rate during this iron period through the kinetic model of ferrous material flow; S3, calculating the number distribution of ladles in the next period through the difference between the ladle input rate and the ladle output rate and the ladle turnover model; S4, comparing the calculated distribution of the number of empty ladles in the number of ladles with the set upper and lower limits of the number of empty ladles; S5, by comparing with the upper and lower limits of the empty ladle, determine the adjustment of the upper and lower limits of the molten iron ladle, where the upper and lower limits are set based on the safe iron supply quantity of the enterprise's blast furnace and the long-term operating conditions.

8. A dynamic control system for the "one package to the end" operation mode of the iron and steel interface, characterized in that: It includes a data acquisition module and a processing module, wherein the data acquisition module is used to collect the turnover operation quantity and turnover efficiency of the ladle at the iron-steel interface, and the output end of the data acquisition module is connected to the input end of the processing module; The processing module executes the method described in any one of claims 1-7 to perform dynamic regulation of the iron-steel interface.

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