A method and system for controlling the flow of materials in a steel manufacturing process

Abstract

This invention discloses a method and system for controlling the flow of materials in a steel manufacturing process, relating to the field of steel manufacturing technology. The method includes: performing material flow analysis and time analysis on nodes and connectors in the steel manufacturing process under a first steady state to obtain material flow network balance results and time analysis results; determining the target product output of each node that meets the preset production requirements based on preset production requirements; determining the dynamic change in output of each node from the initial product output to the target product output; based on the target product output of each node from the initial product output to the target point, and according to the functional relationship of material flow loss of each connector changing with transmission time, determining the coordinated material flow changes of adjacent preceding and following nodes of each node in the steel manufacturing process; and determining the target product output of each node at each moment during the transition to a second steady state based on the coordinated material flow changes. This invention improves the continuity level of the steel manufacturing process.

Description

Technical Field

[0001] This invention relates to the field of steel manufacturing technology, and in particular to a method and system for controlling the flow of materials in the steel manufacturing process. Background Technology

[0002] Material flow primarily refers to the ferrite flow in the steel manufacturing process, involving "nodes" such as sintering, ironmaking, steelmaking, and rolling, with molten iron ladles and steel ladles forming "connectors." These "nodes" and "connectors" are interconnected, creating a networked structure for material flow. Within this network, the flow rates of material at successive "nodes" influence and constrain each other, and the degree of this influence and constraint determines the continuity / quasi-continuity of the steel manufacturing process. Therefore, studying the dynamic operational characteristics of material flow in process industries is of great significance.

[0003] Time is a crucial factor throughout the entire steel manufacturing process, representing a significant aspect of "dynamic operation." Specifically, in the steel manufacturing process, time's importance manifests in the coordination of factors such as the storage and transportation of materials, the sequential nature of each "node" within the manufacturing process, and time planning. It also necessitates adapting the time plan to accommodate changes in production rhythm. The time consumed between "nodes" and within each operational unit of a single "node" reflects the "compactness" of the production process to a certain extent. It has a comprehensive impact on energy consumption, material consumption, quality, cost, and environmental impact, serving as both a fundamental parameter and often an objective function.

[0004] Currently, the steel manufacturing process cannot achieve a rapid response between production plans and order demands. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for controlling the flow of materials in the steel manufacturing process, thereby improving the continuity of the steel manufacturing process.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A method for controlling the flow of materials in a steel manufacturing process includes:

[0008] In the first stable state, material flow analysis and time analysis are performed on the nodes and connectors in the steel manufacturing process to obtain material flow network equilibrium results and time analysis results; the material flow network equilibrium results include the initial product output of each node; the time analysis results include the time analysis of each steel manufacturing process.

[0009] Based on the preset production requirements, the material flow network balance results, and the time analysis results, and under the condition that the steel ratio coefficient remains unchanged, the target product output of each node that meets the preset production requirements is determined.

[0010] Determine the dynamic change in output of each node from the initial product output to the target product output;

[0011] Based on the initial product output of each node to the target product output of the target point, and according to the functional relationship between the material flow loss of each connector and the transmission time, the coordinated changes in the material flow of adjacent preceding and following nodes of each node in the steel manufacturing process are determined.

[0012] Based on the coordinated changes in material flow between adjacent preceding and following nodes, the target product output of each node at each moment is determined during the transition from the first stable state to the second stable state; the second stable state is the state after the preset production requirements are met.

[0013] Optionally, the nodes include sintering, ironmaking, steelmaking and rolling, and the connectors include belts, torpedo ladles and steel ladles.

[0014] Optionally, the analytical formula for the material flow of the j-th unit at the i-th node at time τ is expressed as:

[0015]

[0016] Where, α i,j,τ This represents the auxiliary material flow rate added to the j-th unit of the i-th node at time τ. This represents the flow rate of the material supplied to the j-th unit of the i-th node at time τ. ε represents the mass flow rate at time τ, which is the mass returned to the j-th unit of the i-th node after being recycled by nodes other than the i-th node. i,j,τ γ represents the quantity of qualified export products in the j-th unit at node i at time τ. i,j,τ G represents the amount of scrap in the j-th unit at the i-th node at time τ. i,j,τ β represents the mass flow rate supplied to the next unit from the j-th unit at the i-th node at time τ. i,j,τ S represents the resource recovery material flow rate of the j-th unit at the i-th node at time τ. i,j,τ This represents the loss of mass flow rate in the j-th unit at the i-th node at time τ;

[0017] The l i-1 The analytical formula for the material flow of the connector is expressed as:

[0018]

[0019] Among them, l i-1 α represents the connector between the (i-1)th node and the ith node. li-1,n This indicates that the steel manufacturing system has been joined by external parties. i-1The auxiliary material flow rate, G, of the nth unit of the connector. li-1,n This indicates that the (i-1)th node inputs the lth node. i-1 The mass flow rate of the nth unit of the connector. Indicates the lth i-1 The mass flow rate S of the nth unit of the connector li-1,n Indicate l i-1 Loss material flow rate of the nth unit of the connector.

[0020] Optionally, the material flow network balance result includes the material flow balance formula for each node and the material flow balance formula for each connector;

[0021] The material flow balance formula for the (i-1)th node is expressed as:

[0022]

[0023]

[0024] in, This represents the mass flow rate supplied to node i-1. m represents the mass flow rate supplied to the k-th unit of the (i-1)-th node. i-1 θ represents the number of cells in the (i-1)th node. i-1,k G is the allocation coefficient of the k-th unit of the (i-1)-th node. i-1 G represents the mass flow rate output by the (i-1)th node. i-1,k This indicates the output mass flow rate of the k-th unit in the (i-1)-th node;

[0025] The l i-1 The material flow balance formula for the connector is expressed as:

[0026]

[0027]

[0028] in, Indicates the lth i-1 Number of units in the connector Indicates the supply l i-1 Material flow rate of the connector Indicates output l i-1 Material flow rate of the connector This represents the flow rate of the material supplied to the i-th node.

[0029] Optionally, the time analysis results include sintering time analysis, ironmaking time analysis, steelmaking time analysis, continuous casting time analysis, heating furnace time analysis, and hot rolling time analysis.

[0030] Optionally, based on the initial product output to the target product output at each node, and according to the functional relationship between the material flow loss of each connector and the transmission time, the coordinated changes in material flow between adjacent preceding and following nodes in the steel manufacturing process are determined, specifically including:

[0031] The (i-1)th node, the j-th unit, is in τ (i-1)+Δ(i-1) The target product output at any given time is:

[0032]

[0033] The (i+1)th node and the jth unit are in τ (i+1)+Δ(i+1) The target product output at any given time is:

[0034]

[0035] in, For the i-th node and j-th element in τ i+Δi Target product output at all times For the (i-1)th node and the jth element in τ (i-1)+Δ(i-1) Target product output at all times For the (i+1)th node and the jth element in τ (i+1)+Δ(i+1) Target product output at any given time, r i-1 Let r be the steel ratio coefficient of the (i-1)th node. i Let r be the steel ratio coefficient of the i-th node. i+1 is the steel ratio coefficient of the (i+1)th node.

[0036] Optionally, based on the coordinated changes in material flow between the adjacent preceding and following nodes of each node, the target product output of each node at each time point during the transition from the first stable state to the second stable state is determined; the second stable state is the state after the preset production requirements are met, specifically including:

[0037] The i-th node, the j-th unit, the τ-th i+Δτi The target product output at any given time is:

[0038]

[0039] The (i+1)th node, the jth unit, the τth (i+1)+Δτ(i+1) The target product output at any given time is:

[0040]

[0041] Where τ represents time, M represents the dynamic change in output of the j-th unit at node i when it transitions from the first stable state to the second stable state. i,j,τi This indicates that the i-th node and j-th unit are in the τ-th node. iThe product output at time t is ΔM(τ), which represents the material loss during the flow fluctuation transmission between the j-th unit of the i-th node and the j-th unit of the (i+1)-th node.

[0042] This invention also discloses a material flow control system for steel manufacturing processes, comprising:

[0043] The material flow analysis and time analysis module is used to perform material flow analysis and time analysis on nodes and connectors in the steel manufacturing process under the first steady state to obtain material flow network balance results and time analysis results; the material flow network balance results include the initial product output of each node; the time analysis results include the time analysis of each steel manufacturing process.

[0044] The node target product output determination module is used to determine the target product output of each node that meets the preset production requirements based on the material flow network balance result and the time analysis result, under the condition that the steel ratio coefficient remains unchanged.

[0045] The output dynamic change determination module is used to determine the output dynamic change of each node from the initial product output to the target product output;

[0046] The material flow coordinated change determination module is used to determine the material flow coordinated change of each node in the steel manufacturing process based on the initial product output of each node to the target product output of the target point, according to the functional relationship of the material flow loss of each connector changing with the transmission time.

[0047] The module for determining the target product output of a node at each moment is used to determine the target product output of each node at each moment during the transition from the first stable state to the second stable state, based on the coordinated changes in material flow between the adjacent preceding and following nodes of each node; the second stable state is the state after the preset production requirements are met.

[0048] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0049] This invention introduces a time factor to determine the dynamic change in output from the initial product output to the target product output at each node, as well as the coordinated change in material flow between the nodes before and after it. This provides guidance for timely and effective adjustment and optimization of production planning, which not only meets order demands but also improves the continuity of the steel manufacturing process and saves energy and labor costs. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of a material flow control method in a steel manufacturing process provided by an embodiment of the present invention;

[0052] Figure 2 A flowchart illustrating the dynamic characteristics of material flow provided in an embodiment of the present invention;

[0053] Figure 3 This is a schematic diagram of nodal material flow analysis provided in an embodiment of the present invention;

[0054] Figure 4 This is a schematic diagram of the material flow analysis of the connector provided in an embodiment of the present invention;

[0055] Figure 5 This is a schematic diagram illustrating the material flow analysis between nodes provided in an embodiment of the present invention;

[0056] Figure 6 A principle analysis diagram of the dynamic characteristics of material flow provided in an embodiment of the present invention;

[0057] Figure 7 This is a schematic diagram of a material flow control system in a steel manufacturing process, provided as an embodiment of the present invention. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] The purpose of this invention is to provide a method and system for controlling the flow of materials in the steel manufacturing process, thereby improving the continuity of the steel manufacturing process.

[0060] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] Based on the material flow and time analysis of the steel manufacturing process, this invention, in order to ensure the requirements of order-based production, utilizes the production process characteristics of the steel manufacturing process nodes to obtain the dynamic change of material flow between the baseline state and the target state, and obtains the material flow increase / decrease operation characteristics. On this basis, by utilizing the interaction relationship of material flow between the upstream and downstream nodes of the steel manufacturing process and the functional relationship of connector material flow loss with transmission time, the collaborative operation characteristics of material flow between the upstream and downstream nodes are obtained.

[0062] Example 1

[0063] like Figure 1 and Figure 2 As shown in the figure, this embodiment provides a method for controlling the flow of materials in a steel manufacturing process, including the following steps.

[0064] Step 101: In the first stable state, perform material flow analysis and time analysis on the nodes and connectors in the steel manufacturing process to obtain the material flow network balance result and time analysis result; the material flow network balance result includes the initial product output of each node; the time analysis result includes the time analysis of each steel manufacturing process.

[0065] Step 102: Based on the preset production requirements, the material flow network balance results and the time analysis results, and under the condition that the steel ratio coefficient remains unchanged, determine the target product output of each node that meets the preset production requirements.

[0066] Step 103: Determine the dynamic change in output of each node from the initial product output to the target product output.

[0067] Step 104: Based on the initial product output of each node to the target product output of the target point, and according to the functional relationship of the material flow loss of each connector changing with the transmission time, determine the coordinated material flow changes of the adjacent preceding and following nodes of each node in the steel manufacturing process.

[0068] Step 105: Based on the coordinated changes in material flow between adjacent preceding and following nodes of each node, determine the target product output of each node at each time point during the transition from the first stable state to the second stable state; the second stable state is the state after the preset production requirements are met.

[0069] The nodes include sintering, ironmaking, steelmaking and rolling, and the connectors include belts, torpedo ladles and steel ladles.

[0070] Steel manufacturing systems are complex systems composed of nodes and connectors.

[0071] The material flow at each node is divided into 8 streams, such as Figure 3As shown, the eight material flows satisfy the law of conservation of matter at time τ, as shown in equation (1).

[0072] The analytical formula for the material flow of the j-th unit at the i-th node at time τ is expressed as:

[0073]

[0074] Where, α i,j,τ The auxiliary material flow rate added to the j-th unit of the i-th node at time τ is expressed in tons. The mass flow rate supplied to the j-th unit of the i-th node at time τ is expressed in tons. ε represents the mass flow rate at time τ, which is the mass returned to the j-th unit of the i-th node after being recycled by nodes other than the i-th node; the unit is tons. i,j,τ γ represents the quantity of qualified export products in the j-th unit at node i at time τ, in tons; i,j,τ G represents the amount of scrap in the j-th unit at the i-th node at time τ, in tons; i,j,τ β represents the mass flow rate at time τ from node i to unit j, in tons. i,j,τ S represents the resource recovery material flow rate of the j-th unit at the i-th node at time τ, in tons. i,j,τ This represents the loss of mass flow rate in the j-th unit at the i-th node at time τ, in tons. The external environment refers to the area outside the steel manufacturing system.

[0075] The mass flow analysis of the connector still satisfies the law of conservation of mass. Based on the functional characteristics of the connector, the mass flow consists of four streams, such as... Figure 4 As shown in the figure. The conservation of matter relationship is shown in equation (2).

[0076] The l i-1 The analytical formula for the material flow of the connector is expressed as:

[0077]

[0078] Among them, l i-1 This represents the connector between the (i-1)th node and the ith node. This indicates that the steel manufacturing system has been joined by external parties. i-1 The auxiliary material flow rate of the nth unit of the connector, in tons; This indicates that the (i-1)th node inputs the lth node. i-1 Material flow rate of the nth unit of the connector, in tons; Indicates the lth i-1 The mass flow rate of the nth unit of the connector, in tons; Indicate l i-1 Loss material flow rate of the nth unit of the connector, in tons.

[0079] Figure 4 Middle connector (l) i-1 (n) represents the lth i-1 The nth unit of the connector.

[0080] The material flow relationship between nodes and connectors is as follows: Figure 5 As shown, the time corresponding to node i'-1 is the generation time after the output of node i-1 changes, the time corresponding to node i' is the generation time after the output of node i changes, and the time corresponding to node i'+1 is the generation time after the output of node i+1 changes.

[0081] The material flow network balance result includes the material flow balance formula for each node and the material flow balance formula for each connector.

[0082] The material flow balance formula for the (i-1)th node is expressed as:

[0083]

[0084]

[0085] in, This represents the mass flow rate supplied to node i-1, in tons. This represents the mass flow rate supplied to the k-th unit of the (i-1)-th node, in tons (m). i-1 θ represents the number of cells in the (i-1)th node, in tons; i-1,k G is the allocation coefficient of the k-th unit of the (i-1)-th node. i-1 G represents the mass flow rate output by the (i-1)th node, in tons. i-1,k This indicates the mass flow rate of the k-th unit at the (i-1)-th node, in tons.

[0086] The l i-1 The material flow balance formula for the connector is expressed as:

[0087]

[0088] in, Indicates the lth i-1 Number of units in the connector Indicates the supply l i-1 Material flow rate of the connector, unit: tons; Indicates output l i-1 Material flow rate of the connector, unit: tons; This represents the flow rate of material supplied to the i-th node, in tons.

[0089] The time analysis of the steel manufacturing process is shown in equations (6) to (15).

[0090] Taking the simplest long process as an example, the steel manufacturing process consists of sintering, ironmaking, steelmaking, continuous casting, heating furnace, and rolling (hot rolling).

[0091] The time analysis results include sintering time analysis, ironmaking time analysis, steelmaking time analysis, continuous casting time analysis, heating furnace time analysis, and hot rolling time analysis.

[0092] (1) The sintering time is expressed as follows:

[0093]

[0094] in: The time required for the sintering process, in minutes;

[0095] t 1-1 Let be the sintering time of the material, in minutes. The calculation formula is:

[0096]

[0097] Among them, S 1-s t is the length of the sintering machine, in meters; V is the trolley travel speed, in meters per minute; s Indicates the vertical sintering time, in minutes.

[0098] t 1-2 Let the time (in minutes) of the material being conveyed on the belt be the calculation formula:

[0099]

[0100] Among them, S 1-1 This indicates the length of the conveyor belt used to transport materials to the blast furnace, in meters (m); S 1-2 V represents the length of the sinter traveling on the cooler, in meters (m); 1-1 V represents the average speed of the sintered ore on the cooler, in m / min; 1-2 This indicates the average speed of the belt conveyor, in m / min.

[0101] t 1-3 The storage time of the material in the ore bin, in minutes.

[0102] (2) The iron smelting time is expressed as follows:

[0103]

[0104] in, The time required for the ironmaking process, in min; t 2-1 The smelting time for one cycle of the blast furnace is expressed in minutes.

[0105] t 2-2Let the time (in minutes) for the material to be transferred in the molten iron ladle be the formula for calculation:

[0106]

[0107] Where S2 represents the distance of conveying molten iron to the converter, in meters; and V2 represents the average speed of the conveying process, in meters per minute.

[0108] t 2-3 The storage time of the material in the tank, in minutes.

[0109] (3) The steelmaking time is expressed as follows:

[0110]

[0111] in, The time required for the steelmaking process, in minutes (t). 3-1 The time for one cycle of converter smelting, in minutes;

[0112] t 3-2 The time, expressed in minutes, is the duration of material transport in the ladle. The formula for this time is:

[0113]

[0114] Where: S3 represents the transmission distance, m; V3 represents the average transportation speed, m / min.

[0115] t 3-3 For the storage time, min; t 3-4 Let the total time for ladle refining be in minutes.

[0116] (4) The analytical representation of continuous casting time is as follows:

[0117]

[0118] in, The time required for the continuous casting process, in min; t 4-1 The time consumed at the continuous casting node, min, is equal to the distance S4 (m) from the start position of continuous casting to the flame cutting position and the continuous casting speed V. c The ratio of (m / min); t 4-2 The time from cutting the cast billet to the start of loading is expressed in minutes (t). 4-3 The time from the start of loading to the end of loading, min; t 4-4 The transportation time from the steel plant to the hot rolling mill, in minutes (t). 4-5 The time from unloading to completion, in min; t 4-6 The time interval, in minutes, is the time from when the slab enters the slab storage to when it enters the heating furnace.

[0119] (5) The furnace heating time is expressed as follows:

[0120]

[0121] in, The time required for the heating furnace process, in min; t 5-1 The time taken in the heating furnace equipment, in min; t 5-2 The delay time, in minutes, is the time spent waiting due to material stagnation caused by changes in the operating conditions of the heating furnace.

[0122] (6) The hot rolling time is expressed analytically as follows:

[0123]

[0124] in, The time required for the hot rolling process is in minutes (t); the rolling process time is in seconds (t). 6-1 The time for transporting steel to the finished goods warehouse is t. 6-2 .

[0125] Based on the order production requirements of steel enterprises, using the material flow network balance diagram (material flow network balance result) of the steel manufacturing process in step 101, under the premise of assuming that the steel ratio coefficient remains unchanged, the qualified product output of each key node that meets the order production requirements is obtained. The qualified product output of each key node that meets the order production requirements satisfies the relationship (16) to (18).

[0126] The τ i At time i, the product output of unit j at node i is:

[0127]

[0128] in, For the i-th node and j-th element in τ i Output of qualified export products at any given time, in tons; The mass flow rate of the i-th node and j-th unit at time j is the mass flow rate supplied to the next unit, in tons. For the i-th node and j-th element in τ i The output of qualified products at any given time (target product output), in tons.

[0129] When the production plan changes, the order determines the location of the j-th unit at node i in τ. i+Δi The target product output at any given time is Assuming the steel ratio coefficient is constant, then:

[0130] The (i-1)th node, the j-th unit, is in τ (i-1)+Δ(i-1) The target product output at any given time is:

[0131]

[0132] The (i+1)th node and the jth unit are in τ (i+1)+Δ(i+1) The target product output at any given time is:

[0133]

[0134] in, For the i-th node and j-th element in τ i+Δi Real-time target product output, unit: tons; For the (i-1)th node and the jth element in τ (i-1)+Δ(i-1) Real-time target product output, unit: tons; For the (i+1)th node and the jth element in τ (i+1)+Δ(i+1) Target product output at any given time, in tons; r i-1 Let r be the steel ratio coefficient of the (i-1)th node. i Let r be the steel ratio coefficient of the i-th node. i+1 is the steel ratio coefficient of the (i+1)th node.

[0135] Using the qualified product output of each key node in the material flow network balance diagram in step 101 as the base point and the qualified product output of each key node in step 102 as the target point, the dynamic change in output during the transition process between two stable production states is obtained based on the production process of the key nodes, thus obtaining the material flow increase / decrease characteristics (e.g., Figure 5 (Middle ③)

[0136] Based on the characteristics of the connector, the functional relationship between the material flow loss of the connector and the transmission time is derived. Combined with the increase / decrease characteristics of the material flow at key nodes, the cooperative change relationship of the material flow between adjacent preceding and following nodes in the steel manufacturing process is obtained. Figure 5 The characteristics of the coordinated change of material flow were obtained by examining processes ① and ②.

[0137] In step 103, the dynamic change in output of each node from the initial product output to the target product output satisfies equations (19) to (22).

[0138] The steel manufacturing process can be broadly categorized into three types: heating / cooling, chemical reaction, and mechanical work. The dynamic changes in their output follow the following patterns:

[0139] (1) Heating / cooling type:

[0140]

[0141] Where: M i,j The output of qualified products in the j-th unit of the i-th node, in tons; A is the heat exchange area, in meters. 2h(τ) is the overall heat transfer coefficient, which is affected by the heating or cooling environment and consists of radiation and convection heat transfer coefficients.

[0142]

[0143] Where: h a (τ) is the convective heat transfer coefficient, w / (m²). 2 ·K); ε is the emissivity; δ is the Stephen Boltzmann constant, 5.67 × 10⁻⁶. -8 w / (m 2 ·K 4 );T f (τ) represents the heating / cooling ambient temperature, which is determined by a combination of equipment characteristics and status parameters, in K; T w (τ) represents the surface temperature of the heated / cooled metal material, in K; T(τ) and T0 represent the endpoint and initial temperatures of the heated / cooled metal material, respectively, in K; c p Specific heat, kJ / (kg·K).

[0144] (2) Chemical reaction type:

[0145]

[0146] Where: w is the molecular weight; T(τ) is the thermodynamic temperature, °C; E(τ) is the activation energy, kJ / mol; A is a constant, C A n (τ) and C B m (τ) represents the concentrations of the two reactants in the nth and mth order reactions, in mol / L; R is the ideal gas constant, with a value of 8.314 J / (mol·K).

[0147] (3) Work done by forces:

[0148]

[0149] Where: F(τ) is the applied external force, N; W(τ) is the input work, J; L is the transmission distance, m; v2(τ) and v2(τ) are the starting and ending velocities, m / s.

[0150] The fluctuation in the output of the target product at node i is transmitted to node i+1 and node i-1, satisfying relation (23) to relation (27).

[0151] (1) The τth node of the i-th unit i The output at time 1 is the first steady state:

[0152] The i-th node, the j-th unit, the τ-th i+Δτi The target product output at any given time is:

[0153]

[0154] (2) Due to the coordinated change, the output fluctuation of node i has the following impact on the output of node i+1:

[0155] The (i+1)th node, the jth unit, the τth (i+1)+Δτ(i+1) The product output at any given time is:

[0156]

[0157] in,

[0158]

[0159]

[0160] Where τ represents time, This indicates that the j-th unit of the i-th node has transitioned from the first stable state.

[0161] The dynamic change in output when the second steady state is reached, in t / min; This indicates that the i-th node and j-th unit are in the τ-th node. i The target product output at any given time, in tons; ΔM(τ) represents the material loss during the flow fluctuation transmission between the j-th unit of node i and the j-th unit of node i+1, in tons; This indicates that the (i+1)th node and the jth element are at the τth node. i+1 Target product output at any given time, in tons; This indicates that the i-th node and j-th unit are in the τ-th node. i+Δi The target product output at any given time, in tons; Δi represents the time interval between the baseline state and the target state, in minutes; Δτ i ΔM represents the time step, min, when the time changes dynamically within the time interval Δi; i,j ΔM (i+1),j Indicates the change in output between the baseline and target states, in tons; The time interval between the two nodes is min, obtained from time analysis.

[0162] The above process can be modified according to the specific steel manufacturing process, making it convenient to analyze the dynamic characteristics of material flow in steel manufacturing processes applicable to various actual situations.

[0163] Based on the target product output of each node at each time point determined in step 105, the steel manufacturing process is controlled.

[0164] Example 2

[0165] like Figure 7 As shown, this embodiment provides a material flow control system for a steel manufacturing process, including:

[0166] The material flow analysis and time analysis module 201 is used to perform material flow analysis and time analysis on nodes and connectors in the steel manufacturing process under the first steady state to obtain material flow network balance results and time analysis results; the material flow network balance results include the initial product output of each node; the time analysis results include the time analysis of each steel manufacturing process.

[0167] The target product output determination module 202 for nodes is used to determine the target product output of each node that meets the preset production requirements based on the material flow network balance result and the time analysis result, under the condition that the steel ratio coefficient remains unchanged.

[0168] The output dynamic change determination module 203 is used to determine the output dynamic change of each node from the initial product output to the target product output.

[0169] The material flow coordinated change determination module 204 is used to determine the material flow coordinated change of each node in the steel manufacturing process based on the initial product output of each node to the target product output of the target point, according to the functional relationship of the material flow loss of each connector changing with the transmission time.

[0170] The target product output determination module 205 of each node at each time moment is used to determine the target product output of each node at each time moment during the transition from the first stable state to the second stable state based on the coordinated changes in material flow of the adjacent preceding node and adjacent following node of each node; the second stable state is the state after the preset production requirements are met.

[0171] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0172] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for controlling the flow of materials in a steel manufacturing process, characterized in that, include: In the first stable state, material flow analysis and time analysis are performed on the nodes and connectors in the steel manufacturing process to obtain material flow network equilibrium results and time analysis results; the material flow network equilibrium results include the initial product output of each node; the time analysis results include the time analysis of each steel manufacturing process. Based on the preset production requirements, the material flow network balance results, and the time analysis results, and under the condition that the steel ratio coefficient remains unchanged, the target product output of each node that meets the preset production requirements is determined. Determine the dynamic change in output of each node from the initial product output to the target product output; Based on the initial product output of each node to the target product output of the target point, and according to the functional relationship between the material flow loss of each connector and the transmission time, the coordinated changes of the material flow of adjacent preceding and following nodes of each node in the steel manufacturing process are determined. Based on the coordinated changes in material flow between adjacent preceding and following nodes, the target product output of each node at each time point is determined during the transition from the first stable state to the second stable state; the second stable state is the state after the preset production requirements are met. Based on the coordinated changes in material flow between adjacent preceding and following nodes of each node, the target product output of each node at each time point is determined during the transition from the first stable state to the second stable state. The second stable state is the state after the preset production requirements are met, specifically including: The i-th node, the j-th unit The target product output at any given time is: ； The (i+1)th node, the jth unit The target product output at any given time is: ； in, Indicates time, This represents the dynamic change in output of the j-th unit at node i when it transitions from the first stable state to the second stable state. This indicates that the i-th node and the j-th unit are in the i-th node. Product output at any given time This represents the material loss during the transmission of flow fluctuations between the j-th unit of node i and the j-th unit of node i+1.

2. The material flow control method in the steel manufacturing process according to claim 1, characterized in that, The nodes include sintering, ironmaking, steelmaking and rolling, and the connectors include belts, torpedo ladles and steel ladles.

3. The material flow control method in the steel manufacturing process according to claim 1, characterized in that, At any moment τ The analytical formula for the material flow of the j-th unit at the i-th node is expressed as: ； in, Indicates time τ The auxiliary material flow rate of the j-th unit at the i-th node is added from the outside. Indicates time τ The mass flow rate supplied to the j-th unit of the i-th node. Indicates time τ The mass flow rate of the j-th unit returned to the i-th node after being recycled by nodes other than the i-th node. Indicates time τ The quantity of qualified export products in the j-th unit of the i-th node. Indicates time τ The amount of scrap in the j-th unit of the i-th node. Indicates time τ The material flow rate supplied from the j-th unit of the i-th node to the next unit. Indicates time τ Resource recycling material flow rate of the j-th unit at the i-th node. Indicates time τ Loss of mass flow in the j-th unit of the i-th node; No. l i-1 The analytical formula for the material flow of the connector is expressed as: ； in, l i-1 This represents the connector between the (i-1)th node and the ith node. This indicates that the steel manufacturing system has been joined by external parties. l i-1 The auxiliary material flow rate of the nth unit of the connector. This indicates that the input of the (i-1)th node is the... l i-1 The mass flow rate of the nth unit of the connector. Indicates the first l i-1 The mass flow rate of the nth unit of the connector. express l i-1 Loss material flow rate of the nth unit of the connector.

4. The material flow control method in the steel manufacturing process according to claim 3, characterized in that, The material flow network balance result includes the material flow balance formula for each node and the material flow balance formula for each connector; The material flow balance formula for the (i-1)th node is expressed as: ； ； in, This represents the mass flow rate supplied to node i-1. This represents the mass flow rate supplied to the k-th unit of the (i-1)-th node. This represents the number of cells in the (i-1)th node. Let be the allocation coefficient for the k-th unit of the (i-1)-th node. This represents the mass flow rate output by the (i-1)th node. This indicates the output mass flow rate of the k-th unit in the (i-1)-th node; No. l i-1 The material flow balance formula for the connector is expressed as: ； in, Indicates the first l i-1 Number of units in the connector Indicates supply l i-1 Material flow rate of the connector Indicates output l i-1 Material flow rate of the connector This represents the flow rate of the material supplied to the i-th node.

5. The material flow control method in the steel manufacturing process according to claim 1, characterized in that, The time analysis results include sintering time analysis, ironmaking time analysis, steelmaking time analysis, continuous casting time analysis, heating furnace time analysis, and hot rolling time analysis.

6. The material flow control method in the steel manufacturing process according to claim 1, characterized in that, Based on the initial product output of each node to the target product output of the target point, and according to the functional relationship between the material flow loss of each connector and the transmission time, the coordinated changes in material flow of adjacent preceding and following nodes in the steel manufacturing process are determined, specifically including: The j-th unit of the (i-1)-th node is The target product output at any given time is: ； The (i+1)th node, the j-th unit is The target product output at any given time is: ； in, For the i-th node and j-th unit in Target product output at all times For the (i-1)th node and the jth unit in Target product output at all times For the (i+1)th node and the jth unit in Target product output at all times Let be the steel ratio coefficient of the (i-1)th node. Let be the steel ratio coefficient of the i-th node. is the steel ratio coefficient of the (i+1)th node.

7. A material flow control system for a steel manufacturing process, characterized in that, include: The material flow analysis and time analysis module is used to perform material flow analysis and time analysis on nodes and connectors in the steel manufacturing process under the first steady state to obtain material flow network balance results and time analysis results; the material flow network balance results include the initial product output of each node; the time analysis results include the time analysis of each steel manufacturing process. The node target product output determination module is used to determine the target product output of each node that meets the preset production requirements based on the material flow network balance result and the time analysis result, under the condition that the steel ratio coefficient remains unchanged. The output dynamic change determination module is used to determine the output dynamic change of each node from the initial product output to the target product output; The material flow coordinated change determination module is used to determine the material flow coordinated change of each node in the steel manufacturing process based on the initial product output of each node to the target product output of the target point, according to the functional relationship of the material flow loss of each connector changing with the transmission time. The module for determining the target product output of a node at each moment is used to determine the target product output of each node at each moment during the transition from the first stable state to the second stable state, based on the coordinated changes in material flow between the adjacent preceding and following nodes of each node; the second stable state is the state after the preset production requirements are met. Based on the coordinated changes in material flow between adjacent preceding and following nodes of each node, the target product output of each node at each time point is determined during the transition from the first stable state to the second stable state. The second stable state is the state after the preset production requirements are met, specifically including: The i-th node, the j-th unit The target product output at any given time is: ； The (i+1)th node, the jth unit The target product output at any given time is: ； in, Indicates time, This represents the dynamic change in output of the j-th unit at node i when it transitions from the first stable state to the second stable state. This indicates that the i-th node and the j-th unit are in the i-th node. Product output at any given time This represents the material loss during the transmission of flow fluctuations between the j-th unit of node i and the j-th unit of node i+1.

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