A method for automatically regulating continuous casting mold powder

Abstract

An automatic control method for the protective slag in a continuous casting mold is disclosed. This method automatically matches the type of protective slag to the current steel grade, automatically calculates the target slag addition amount based on the matching, and automatically completes the slag addition. This invention solves the problem of inaccurate slag addition control during automatic slag addition by setting mutually exclusive target slag addition amounts based on casting speed and slag addition amount, as well as target slag addition amounts based on historical data, thus making automatic slag addition possible. Furthermore, it establishes a data logic structure of steel grade, cross-sectional specifications, protective slag type, and target slag addition amount to create a database for retrieval and matching. Finally, by setting corresponding peripheral equipment and establishing corresponding control logic, it enables automatic loading of the appropriate slag type according to the current production plan and automatic switching between various slag addition operations.

Description

Technical Field

[0001] This invention belongs to the field of continuous casting steelmaking, specifically relating to an automatic control method for the protective slag in a continuous casting crystallizer. Background Technology

[0002] In the field of continuous casting steelmaking, the crystallizer is a key core piece of equipment used to solidify molten steel into a primary billet shell. Mold flux is a powdery or granular non-metallic compound added to the surface of the molten steel within the crystallizer. The addition of mold flux is closely related to the stable and smooth operation of continuous casting and the quality of the cast steel. Typically, the process requires the continuous addition of mold flux to the crystallizer during casting to replenish its consumption during the steel casting process, serving to lubricate, maintain temperature, fill voids, and prevent oxidation of the molten steel.

[0003] With the increasing automation of steel plants, automatic slag addition equipment is now widely used in continuous casting production lines. This equipment can feed slag into the crystallizer at a set speed, reducing the workload of workers. However, since continuous casting production plans include hundreds of steel grades and various cross-sectional specifications, different types of slag are used for different steel grades and cross-sectional specifications. Furthermore, the consumption rate of slag varies under different cross-sectional specifications and casting speeds. Therefore, manual intervention is still required to repeatedly modify settings and make adjustments during production. This not only hinders further improvements in automation and labor productivity but also increases the risk of production accidents and batch quality defects if workers make operational errors due to fatigue or negligence, such as using the wrong type of slag or adding the wrong amount.

[0004] Based on current information both domestically and internationally, the above problems are prevalent in various steelmaking enterprises.

[0005] Invention application CN201210482960.7 discloses "a method and device for measuring and controlling the mold flux of a continuous casting machine." The method involves projecting a laser onto the upper surface of the mold flux and the sidewall of the mold, obtaining the mold flux position Lslag based on the length of the projected line on the sidewall, and obtaining the change in the smoothness of the mold flux surface based on the laser projection onto the upper surface. A liquid level detection system is used to obtain the liquid level Lsteel in the mold, resulting in the mold flux thickness L = Lsteel - Lslag and the change in slag thickness. The slag feeding action of the slag feeding equipment is controlled based on the slag thickness and its change. The device for measuring and controlling the mold flux includes: a mold flux position detection system, a mold liquid level detection system, and an automatic mold flux feeding system. The mold flux position detection system includes a laser source, monitoring equipment, a processor, a main control computer, and a field display terminal.

[0006] The invention application with application number CN201510457241.3 discloses "a crystallizer protective slag adding device", which includes: a frame, a protective slag silo set on the frame, a quantitative feeding device for quantitatively discharging the protective slag silo at the outlet of the protective slag silo, a controller for controlling the discharging frequency of the quantitative feeding device on the frame, the outlet of the quantitative feeding device being connected to the inlet of a flexible chute, the outlet of the flexible chute being connected to the inlet of a rigid chute, the crystallizer protective slag entering the crystallizer from the outlet of the rigid chute, and a vibrator being set on the support frame supporting the rigid chute.

[0007] Invention application CN201620116935.0 discloses a "rapid replacement device for multiple silos of crystallizer protective slag," comprising an operating panel and multiple silos arranged side by side, each silo being connected to an electric feed valve and a guide pipe. The upper half of the silo is rectangular, and the lower half is conical. An electric feed valve is located at the bottom of the lower half, and the electric feed valve is connected to the guide pipe and the bottom of the silo. The operating panel is electrically connected to all the electric feed valves, forming a switching circuit, and all the guide pipes are connected to a slag feeder.

[0008] Invention application CN201810045429.0 discloses "An Automatic Addition System for Protective Slag in a Crystallizer," comprising a control system, two hoppers, a conveying pipe, a frame, a robot, a screw conveyor, and an infrared detection device. The frame includes an upper frame and a lower frame. The hoppers, conveying pipe, and robot are arranged from top to bottom. The hoppers are fixed to the upper frame and connected to the conveying pipe, which is connected to the screw conveyor, which is fixed to the robot. The robot hangs upside down below the lower frame and can move laterally along the lower frame. The control system is connected to the infrared detection device, the hoppers, the robot, and the screw conveyor. The two-hopper design of this invention allows for switching between various protective slags, improving slag replacement efficiency. Summary of the Invention

[0009] To address the above problems, this invention provides an automatic control method for the protective slag in a continuous casting mold, the specific technical solution of which is as follows:

[0010] An automatic control method for the protective slag in a continuous casting crystallizer, characterized in that:

[0011] The system automatically matches the appropriate protective slag type for the current steel grade, automatically calculates the target slag addition amount for the crystallizer based on the matching, and automatically completes the slag addition based on the calculation.

[0012] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0013] The automatic matching of the appropriate protective slag type for the current steel grade specifically refers to:

[0014] First, based on the data logic structure of steel grade information, cross-sectional specification information, protective slag type information, and set slag addition amount information, the configuration parameter table is established.

[0015] Then, each time a production plan is issued, the system performs a matching query between the current production plan data and the corresponding parameters in the configuration parameter table based on the steel type and cross-sectional specification information in the production plan, and completes the automatic matching based on the query results.

[0016] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0017] Large hoppers (1) are set up according to the type of protective slag, corresponding to each type.

[0018] And establish an information table based on the data structure of protective slag type + large hopper number + protective slag metering parameters;

[0019] The information table forms a tree-like logical structure through the protective slag type and configuration parameter table.

[0020] The matching query is based on a configuration parameter table containing an information table.

[0021] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0022] Each large hopper is equipped with a discharge pipe leading to the main pipeline (2) and a corresponding outlet valve (3) at its discharge port;

[0023] The outlet of the main pipeline is connected to the intermediate hopper (5) via a vacuum conveyor (4).

[0024] An inlet valve (6) and a suitable air connection valve (7) are installed at the location where the main pipeline outlet connects to the vacuum conveyor (4) pipeline;

[0025] The outlet of the intermediate hopper is connected to the crystallizer via a screw feeder pipeline;

[0026] The automatic addition of slag based on calculations is specifically as follows:

[0027] Based on the matched type of protective slag and the number of the large hopper, the outlet valve of the corresponding large hopper is opened. The amount of slag to be added is delivered to the intermediate hopper based on the target amount of slag and the remaining casting time. The speed of the screw feeder is set according to the target amount of slag, and the slag is added through the screw feeder.

[0028] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0029] The configuration parameter table is customizable.

[0030] The self-iterative system includes data addition based on new steel grade information, cross-sectional specification information, protective slag type information, and set slag addition amount information, as well as self-iterative updates of the set slag addition amount for each steel grade.

[0031] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0032] The information on the set slag addition amount includes: casting speed benchmark, slag addition amount benchmark, and predicted slag consumption per ton of steel;

[0033] The pulling speed benchmark and the slag addition benchmark are logically related, and the two are mutually exclusive with the predicted slag consumption per ton of steel when the configuration parameter table is matched with information.

[0034] When the number of steel production furnaces does not reach the set number, the matching is based on the casting speed benchmark and the slag addition benchmark; when the number of steel production furnaces reaches the set number, the matching is based on the predicted slag consumption per ton of steel.

[0035] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0036] The information on the set slag addition amount includes: casting speed benchmark, slag addition amount benchmark, and predicted slag consumption per ton of steel;

[0037] The pulling speed benchmark and the slag addition benchmark are logically related, and the two are mutually exclusive with the predicted slag consumption per ton of steel when the configuration parameter table is matched with information.

[0038] When the number of steel production furnaces does not reach the set number, the matching is based on the casting speed benchmark and the slag addition benchmark; when the number of steel production furnaces reaches the set number, the matching is based on the predicted slag consumption per ton of steel.

[0039] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0040] The information on the set slag addition amount includes: casting speed benchmark, slag addition amount benchmark, and predicted slag consumption per ton of steel;

[0041] The pulling speed benchmark and the slag addition benchmark are logically related, and the two are mutually exclusive with the predicted slag consumption per ton of steel when the configuration parameter table is matched with information.

[0042] When the number of steel production furnaces does not reach the set number, the matching is based on the casting speed benchmark and the slag addition benchmark; when the number of steel production furnaces reaches the set number, the matching is based on the predicted slag consumption per ton of steel.

[0043] The self-iterable

[0044] When the number of steel production furnaces does not reach the set value, only the data based on the new steel grade information + cross-sectional specification information + protective slag type information + set slag addition amount information is added;

[0045] When the number of steel production furnaces reaches the set value, the system includes data addition based on the new steel grade information, cross-sectional specification information, protective slag type information, and set slag addition amount information, as well as the automatic updating of the set slag addition amount for each steel grade.

[0046] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0047] The automatic updating of the set slag addition amount for each steel grade includes the following two types:

[0048] I. When the number of steel production furnaces reaches a set number, the parameter used to characterize the change in the set slag addition amount;

[0049] II. When using the predicted slag consumption per ton of steel as the parameter for matching, the predicted slag consumption per ton of steel undergoes its own numerical iteration as the number of heats produced for this steel grade increases.

[0050] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0051] The slag addition benchmark is determined based on the unit slag addition amount when the steel grade maintains slag layer balance under the corresponding casting speed benchmark.

[0052] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0053] The predicted slag consumption per ton of steel is determined based on the average slag consumption per ton of steel in historical heats for that steel grade.

[0054] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0055] According to process requirements, an upper limit and a lower limit for slag volume are set for the intermediate hopper.

[0056] When the amount of slag in the intermediate hopper reaches the set lower limit, the vacuum conveyor, air connection valve, inlet valve and corresponding large hopper outlet valve are triggered to open until the amount of slag in the intermediate hopper reaches the set upper limit or the amount of slag replenishment determined based on the target amount of slag and the remaining casting time. Then the vacuum conveyor, air connection valve, inlet valve and corresponding outlet valve are closed.

[0057] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0058] A weighing sensor is installed in the intermediate hopper, and the actual amount of slag in the intermediate hopper is monitored by the weighing sensor.

[0059] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0060] When the slag amount in the intermediate hopper reaches the replenishment amount determined based on the target slag addition amount and the remaining casting time, the outlet valve is immediately closed, and the vacuum conveyor, air connection valve and corresponding inlet valve are closed with a delay within a set time.

[0061] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0062] When the number of steel production furnaces has not reached the set number, the setting of the screw feeder speed based on the target slag addition amount is completed based on the current casting speed and the corresponding casting speed benchmark and slag addition amount benchmark in the configuration parameter table.

[0063] When the number of steel production furnaces reaches the set number, the rotation speed setting of the screw feeder is completed based on the target slag addition amount, which is based on the current rotation speed and the corresponding predicted slag consumption per ton of steel in the configuration parameter table.

[0064] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0065] The phrase "the screw feeder speed setting is based on the current pulling speed and combined with the corresponding pulling speed benchmark and slag amount benchmark in the configuration parameter table" specifically means: first, the target slag amount based on the current pulling speed is calculated using the following formula, and then the screw feeder speed is calculated based on the target slag amount and the protective slag metering parameters.

[0066]

[0067] In the formula,

[0068] PVset: Target slag addition amount per unit time based on the current pulling speed, unit: g / min;

[0069] Vact: Current actual pulling speed, unit: m / min;

[0070] Vref: Pulling speed reference, unit: m / min;

[0071] PVref: Set the amount of slag to be added; Unit: g / min;

[0072] n: Rotational speed of the screw feeder, in r / min;

[0073] K: Metering parameter for protective slag, unit: g / r.

[0074] An automatic control method for the protective slag in a continuous casting crystallizer according to the present invention is characterized in that:

[0075] The phrase "setting the screw feeder speed based on the target slag addition amount and combining the current speed with the corresponding predicted slag consumption per ton of steel in the configuration parameter table" specifically means: first, calculate the target slag addition amount based on the current pulling speed using the following formula, and then calculate the screw feeder speed based on the target slag addition amount and the protective slag metering parameters;

[0076]

[0077] In the formula,

[0078] PVset: Target slag addition amount per unit time based on the current pulling speed, unit: g / min;

[0079] Vact: Current actual pulling speed, unit: m / min;

[0080] F i : Predicted slag consumption per ton of steel for the current steel grade, unit: g / t;

[0081] D meter : The weight per meter of the cast billet corresponding to the current cross-sectional specifications, in t / m;

[0082] n: Rotational speed of the screw feeder, in r / min;

[0083] K: Metering parameter for protective slag, unit: g / r.

[0084] This invention provides an automatic control method for the protective slag in a continuous casting mold. By setting mutually exclusive target slag addition amounts based on casting speed and slag addition amount, as well as target slag addition amounts based on historical data, the method solves the problem of inaccurate control of slag addition during automatic slag addition, making automatic slag addition possible. Furthermore, by establishing a data logic structure consisting of steel grade, cross-sectional specifications, protective slag type, and target slag addition amount, a database for retrieval and matching is created. Additionally, by setting corresponding peripheral equipment and establishing corresponding control logic, the method enables automatic loading of the appropriate slag type and automatic switching between various slag addition operations based on the current production plan. The target slag addition amount based on historical data is determined by the cumulative average historical slag consumption per ton of steel, and this value can be updated iteratively as data accumulates. The target slag addition amount, composed of the casting speed benchmark and the slag addition amount benchmark, serves as a substitute when the data volume is limited and the corresponding average historical slag consumption per ton of steel is not entirely accurate. To ensure that this substitute can ultimately guide the determination of a more accurate target slag addition amount during specific services, the target slag addition amount is finally determined by combining real-time casting speed detection with the target slag addition amount composed of the casting speed benchmark and the slag addition amount benchmark. Simultaneously, the equipment setup, through the installation of a vacuum conveyor and a compatible air connection valve, achieves closed-loop replenishment of protective slag, providing a reliable guarantee for the control of the target slag addition amount. In summary, this invention provides an automatic control method for the protective slag in continuous casting molds. This method solves the problem that existing technologies still require repeated manual intervention to adjust the type and amount of protective slag, which is prone to production accidents and quality defects due to manual operation errors. Therefore, it reduces the workload of operators and improves the intelligence and labor productivity of the automatic protective slag addition operation. Attached Figure Description

[0085] Figure 1 This is a schematic diagram of the automatic slag addition control process in an embodiment of the present invention;

[0086] Figure 2 This is a schematic diagram of the automatic slag feeding system in an embodiment of the present invention.

[0087] In the picture,

[0088] 1-Large hopper,

[0089] 2-Main pipeline,

[0090] 3-Outlet valve,

[0091] 4-Vacuum conveyor,

[0092] 5-Intermediate hopper,

[0093] 6-Inlet valve,

[0094] 7-Air connecting valve,

[0095] 8-Crystallizer,

[0096] 9-Screw feeder. Detailed Implementation

[0097] The automatic control method for mold flux in a continuous casting crystallizer according to the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0098] An automatic control method for the protective slag in a continuous casting mold is provided, which automatically matches the type of protective slag to the current steel grade, automatically calculates the target slag addition amount for the mold based on the matching, and automatically completes the slag addition based on the calculation.

[0099] in,

[0100] The automatic matching of the appropriate protective slag type for the current steel grade specifically refers to:

[0101] First, based on the data logic structure of steel grade information, cross-sectional specification information, protective slag type information, and set slag addition amount information, the configuration parameter table is established.

[0102] Then, each time a production plan is issued, the system performs a matching query between the current production plan data and the corresponding parameters in the configuration parameter table based on the steel type and cross-sectional specification information in the production plan, and completes the automatic matching based on the query results.

[0103] in,

[0104] Large hoppers (1) are set up according to the type of protective slag, corresponding to each type.

[0105] And establish an information table based on the data structure of protective slag type + large hopper number + protective slag metering parameters;

[0106] The information table forms a tree-like logical structure through the protective slag type and configuration parameter table.

[0107] The matching query is based on a configuration parameter table containing an information table.

[0108] in,

[0109] Each large hopper is equipped with a discharge pipe leading to the main pipeline (2) and a corresponding outlet valve (3) at its discharge port;

[0110] The outlet of the main pipeline is connected to the intermediate hopper (5) via a vacuum conveyor (4).

[0111] An inlet valve (6) and a suitable air connection valve (7) are installed at the location where the main pipeline outlet connects to the vacuum conveyor (4) pipeline;

[0112] The outlet of the intermediate hopper is connected to the crystallizer via a screw feeder pipeline;

[0113] The automatic addition of slag based on calculations is specifically as follows:

[0114] Based on the matched type of protective slag and the number of the large hopper, the outlet valve of the corresponding large hopper is opened. The amount of slag to be added is delivered to the intermediate hopper based on the target amount of slag and the remaining casting time. The speed of the screw feeder is set according to the target amount of slag, and the slag is added through the screw feeder.

[0115] in,

[0116] The configuration parameter table is customizable.

[0117] The self-iterative system includes data addition based on new steel grade information, cross-sectional specification information, protective slag type information, and set slag addition amount information, as well as self-iterative updates of the set slag addition amount for each steel grade.

[0118] in,

[0119] The information on the set slag addition amount includes: casting speed benchmark, slag addition amount benchmark, and predicted slag consumption per ton of steel;

[0120] The pulling speed benchmark and the slag addition benchmark are logically related, and the two are mutually exclusive with the predicted slag consumption per ton of steel when the configuration parameter table is matched with information.

[0121] When the number of steel production furnaces does not reach the set number, the matching is based on the casting speed benchmark and the slag addition benchmark; when the number of steel production furnaces reaches the set number, the matching is based on the predicted slag consumption per ton of steel.

[0122] The self-iterative method, when the number of steel production furnaces has not reached the set value, simply adds data based on the steel grade information, cross-sectional specification information, protective slag type information, and set slag addition amount information of the new steel grade.

[0123] When the number of steel production furnaces reaches the set value, the system includes data addition based on the new steel grade information, cross-sectional specification information, protective slag type information, and set slag addition amount information, as well as the automatic updating of the set slag addition amount for each steel grade.

[0124] in,

[0125] The automatic updating of the set slag addition amount for each steel grade includes the following two types:

[0126] I. When the number of steel production furnaces reaches a set number, the parameter used to characterize the change in the set slag addition amount;

[0127] II. When using the predicted slag consumption per ton of steel as the parameter for matching, the predicted slag consumption per ton of steel undergoes its own numerical iteration as the number of heats produced for this steel grade increases.

[0128] in,

[0129] The slag addition benchmark is determined based on the unit slag addition amount when the steel grade maintains slag layer balance under the corresponding casting speed benchmark.

[0130] in,

[0131] The predicted slag consumption per ton of steel is determined based on the average slag consumption per ton of steel in historical heats for that steel grade.

[0132] in,

[0133] According to process requirements, an upper limit and a lower limit for slag volume are set for the intermediate hopper.

[0134] When the amount of slag in the intermediate hopper reaches the set lower limit, the vacuum conveyor, air connection valve, inlet valve and corresponding large hopper outlet valve are triggered to open until the amount of slag in the intermediate hopper reaches the set upper limit or the amount of slag replenishment determined based on the target amount of slag and the remaining casting time. Then the vacuum conveyor, air connection valve, inlet valve and corresponding outlet valve are closed.

[0135] in,

[0136] A weighing sensor is installed in the intermediate hopper, and the actual amount of slag in the intermediate hopper is monitored by the weighing sensor.

[0137] in,

[0138] When the slag amount in the intermediate hopper reaches the replenishment amount determined based on the target slag addition amount and the remaining casting time, the outlet valve is immediately closed, and the vacuum conveyor, air connection valve and corresponding inlet valve are closed with a delay within a set time.

[0139] in,

[0140] When the number of steel production furnaces has not reached the set number, the setting of the screw feeder speed based on the target slag addition amount is completed based on the current casting speed and the corresponding casting speed benchmark and slag addition amount benchmark in the configuration parameter table.

[0141] When the number of steel production furnaces reaches the set number, the rotation speed setting of the screw feeder is completed based on the target slag addition amount, which is based on the current rotation speed and the corresponding predicted slag consumption per ton of steel in the configuration parameter table.

[0142] in,

[0143] The phrase "the screw feeder speed setting is based on the current pulling speed and combined with the corresponding pulling speed benchmark and slag amount benchmark in the configuration parameter table" specifically means: first, the target slag amount based on the current pulling speed is calculated using the following formula, and then the screw feeder speed is calculated based on the target slag amount and the protective slag metering parameters.

[0144]

[0145] In the formula,

[0146] PVset: Target slag addition amount per unit time based on the current pulling speed, unit: g / min;

[0147] Vact: Current actual pulling speed, unit: m / min;

[0148] Vref: Pulling speed reference, unit: m / min;

[0149] PVref: Set the amount of slag to be added; Unit: g / min;

[0150] n: Rotational speed of the screw feeder, in r / min;

[0151] K: Metering parameter for protective slag, unit: g / r.

[0152] in,

[0153] The phrase "setting the screw feeder speed based on the target slag addition amount and combining the current speed with the corresponding predicted slag consumption per ton of steel in the configuration parameter table" specifically means: first, calculate the target slag addition amount based on the current pulling speed using the following formula, and then calculate the screw feeder speed based on the target slag addition amount and the protective slag metering parameters;

[0154]

[0155] In the formula,

[0156] PVset: Target slag addition amount per unit time based on the current pulling speed, unit: g / min;

[0157] Vact: Current actual pulling speed, unit: m / min;

[0158] F i : Predicted slag consumption per ton of steel for the current steel grade, unit: g / t;

[0159] D meter : The weight per meter of the cast billet corresponding to the current cross-sectional specifications, in t / m;

[0160] n: Rotational speed of the screw feeder, in r / min;

[0161] K: Metering parameter for protective slag, unit: g / r.

[0162] Working process and principle

[0163] This invention discloses an automatic control method for mold flux in continuous casting crystallizers, which can be configured based on either L1 or L2. The specific process is as follows: A configuration database for querying and matching is established based on the steel grades and cross-sectional specifications of the continuous casting machine, the corresponding mold flux types, and the target slag addition amount. Furthermore, corresponding large hopper numbers and mold flux metering parameters are established for each mold flux type. The target slag addition amount consists of two mutually exclusive components: one is composed of a casting speed benchmark and a slag addition amount benchmark, and the other is composed of a predicted slag consumption per ton of steel based on historical data. The mutual exclusion means that when the number of production heats for the corresponding steel grade does not reach the set number (which is the minimum sample size available for analysis), the matching is based on the casting speed benchmark and the slag addition amount benchmark; when the number of production heats for the corresponding steel grade reaches the set number, the matching is based on the predicted slag consumption per ton of steel. The slag consumption per ton of steel is set in such a way that automatic slag addition remains feasible even when the historical sample size is small. To improve accuracy in determining the target slag addition amount, a real-time pulling speed detection system is established, and the final screw feeder speed is set based on the real-time pulling speed combined with the protective slag metering parameters. The predicted slag consumption per ton of steel based on historical data is determined by the average slag consumption per ton of steel from a historical number of furnaces. As production accumulates and the corresponding historical data increases, the corresponding average calculation will be iteratively updated according to the changes in the quantity. In the database parameters, when a new steel grade fails to match, the database data will be added according to the new steel grade. Correspondingly, the peripheral equipment consists of a screw feeder connected to the crystallizer and an intermediate hopper connected to the screw feeder. The intermediate hopper, in conjunction with the screw feeder, performs slag addition operations on the crystallizer based on the target slag addition amount. Large hoppers (1) are set up one-to-one with the types of protective slag, and a corresponding association relationship with the corresponding protective slag type is established by assigning a control logic number to each large hopper. Each large hopper has a discharge pipeline leading to the main pipeline (2) and a corresponding outlet valve (3) at its outlet. The outlet of the main pipeline is connected to the intermediate hopper (5) via a vacuum conveyor (4). An inlet valve (6) and a suitable air communication valve (7) are set at the connection between the outlet of the main pipeline and the pipeline of the vacuum conveyor (4) to control and transport the slag addition amount by vacuum suction, so that the accuracy is guaranteed.

[0164] When the continuous casting production control system issues the current production plan for steel grade and cross-sectional specifications, it triggers a matching retrieval of the configuration database. Based on the matching results, it reads the corresponding steel grade information, cross-sectional specifications, protective slag information, target slag addition information, large hopper number information, and protective slag metering parameters into the data buffer. The control system then reads the target slag addition from the data buffer to complete the corresponding control settings for the large hopper and intermediate hopper, and sets the corresponding screw feeder speed based on the target slag addition and protective slag metering parameters read from the data buffer. To establish operation under process requirements, an upper and lower limit for slag addition is set for the intermediate hopper, and the slag addition is monitored by a weighing sensor. When When the slag level in the intermediate hopper reaches the set lower limit, the corresponding large hopper outlet valve, vacuum conveyor, air communication valve, and inlet valve are activated to replenish slag until the slag replenishment level is reached (the slag replenishment level is determined based on the target slag addition amount and the remaining casting time, where the target slag addition amount is the amount of slag added to the crystallizer per unit time, unit: g / min) or the slag level in the intermediate hopper reaches the set upper limit. Then, the corresponding outlet valve, vacuum conveyor, air communication valve, and inlet valve are closed. When the corresponding equipment is shut down due to reaching the slag replenishment level, in order to clear the residual slag in the main pipeline, the shutdown follows the following principle: the outlet valve is closed immediately, while the vacuum conveyor, air communication valve, and inlet valve are closed after a set time.

[0165] When the number of steel production furnaces does not reach the set number, the parameters involved in parameter matching in the parameter configuration table are the casting speed reference + slag addition reference. In specific control, the target slag addition based on the current casting speed is first calculated using the following formula, and then the rotation speed of the screw feeder is calculated based on the target slag addition and the protective slag metering parameters.

[0166]

[0167] In the formula,

[0168] PVset: Target slag addition amount per unit time based on the current pulling speed, unit: g / min;

[0169] Vact: Current actual pulling speed, unit: m / min;

[0170] Vref: Pulling speed reference, unit: m / min;

[0171] PVref: Standard for slag addition; Unit: g / min

[0172] n: Rotational speed of the screw feeder, in r / min;

[0173] K: Metering parameter for protective slag, unit: g / r.

[0174] When the number of steel production furnaces reaches the set number, the rotational speed of the screw feeder is calculated based on the corresponding predicted slag consumption per ton of steel in the configuration parameter table, combined with the current casting speed and protective slag metering parameters:

[0175]

[0176] In the formula,

[0177] PVset: Target slag addition amount per unit time based on the current pulling speed, unit: g / min;

[0178] Vact: Current actual pulling speed, unit: m / min;

[0179] F i : Predicted slag consumption per ton of steel for the current steel grade, unit: g / t;

[0180] D meter : The weight per meter of the cast billet corresponding to the current cross-sectional specifications, in t / m;

[0181] n: Rotational speed of the screw feeder, in r / min;

[0182] K: Metering parameter for protective slag, unit: g / r.

[0183] F in the above formula i (i.e., the predicted slag consumption per ton of steel for the current steel grade), determined based on the average slag consumption per ton of steel from the previous few heats of the same steel grade: F i =(P i-1 +P i-2 +P i-3 +......+P i-n ) / n,

[0184] In the formula, F i The current predicted slag consumption per ton of steel in the furnace;

[0185] P i-1 The slag consumption per ton of steel in the previous furnace;

[0186] P i-2 P i-3 P i-n : These represent the slag consumption per ton of steel for the first two heats, the first three heats, and the first n heats, respectively;

[0187] n: Number of furnaces to be counted.

[0188] The slag consumption per ton of steel per furnace is determined by the following formula:

[0189] P i =W steel / P add ,

[0190] in,

[0191] P i Slag consumption per ton of steel per furnace, unit: g / t;

[0192] W steel Steel throughput, in tons (t);

[0193] P add : Consumption of protective slag, unit: g.

[0194] The steel throughput is determined based on the actual casting speed and casting time during the casting process; while the amount of protective slag added to the crystallizer is determined based on the actual rotation speed of the screw feeder and the casting time, as follows:

[0195] W steel =V cast *D meter *t cast ,;P add =V ract *K*t cast ;

[0196] in,

[0197] W steel Steel throughput, in tons (t); V cast Actual pulling speed, in m / min; D meter : Weight per meter of cast billet corresponding to the cross-sectional specifications, unit t / m; t cast : Casting time, in minutes; P add : Consumption of protective slag, unit: g; V ract : Actual rotational speed of the screw feeder, unit: r / min; K: Metering parameter of protective slag, unit: g / r; t cast : Casting time, in minutes.

[0198] Example

[0199] Since the automatic slag addition control based on the predicted slag consumption per ton of steel based on historical data when the number of steel production furnaces reaches the set number, and the automatic slag addition control based on the target slag addition amount represented by the casting speed reference + slag addition amount reference when the number of steel production furnaces does not reach the set number, the two control methods are the same except for the real-time calculation of the average historical slag consumption per ton of steel and the basis for setting the speed of the screw feeder. Therefore, this embodiment uses the automatic slag addition control based on the target slag addition amount represented by the casting speed reference + slag addition amount reference as an example.

[0200] For ease of understanding, this embodiment represents the matching configuration database as a parameter configuration module, the data storage that reads the corresponding steel grade information, cross-sectional specification information, protective slag information, target slag addition amount information, large hopper number information, and protective slag metering parameter information into the data storage as an automatic slag selection module, the control system reading relevant data from the data storage to complete slag replenishment monitoring based on the target slag addition amount as an automatic slag replenishment module, and the part of the control system reading relevant data from the data storage to complete the screw feeder speed setting as an automatic slag addition module. The specific implementation process is as follows:

[0201] This embodiment is applied to a four-strand continuous casting machine for round and square billets. The casting cross-sectional specifications of the continuous casting machine include: large square billets of 320*425mm, large round billets of 300mm, and large round billets of 380mm. The embodiment of the present invention will be further described below with reference to the accompanying drawings.

[0202] like Figure 1 As shown, the corresponding automatic control method for the mold flux in a continuous casting mold includes the following steps:

[0203] 1) A database is pre-configured in the parameter configuration module, which includes the type of protective slag, casting speed benchmark and slag addition benchmark parameters corresponding to each steel grade and cross-section specification of the continuous casting machine, as well as the large hopper number and protective slag metering parameters corresponding to each type of protective slag.

[0204] In this example, the configured database includes Table 1 and Table 2. Table 1 includes steel grade, cross-sectional specifications, type of protective slag, casting speed reference, and slag addition reference, as shown in Table 1 below. The continuous casting machine supports hundreds of steel grades. The cross-sectional specifications refer to the internal cross-sectional dimensions of the crystallizer, which are basically consistent with the cross-sectional specifications of the cast billet. The casting speed reference represents the standard casting speed matching the steel grade and cross-sectional specifications in the production plan, in m / min. The slag addition reference represents the slag addition parameter matching this standard casting speed, in g / min, which is related to the steel grade, cross-sectional specifications, type of protective slag, and casting speed, and is generally determined based on empirical values ​​for maintaining slag layer balance for typical steel grades. Table 2 includes type of protective slag, large hopper number, and protective slag metering parameters, as shown in Table 2 below. The large hopper number indicates the location of the large hopper storing this type of protective slag, and the protective slag metering parameters represent the amount of slag that can be delivered per revolution of the screw feeder, in g / r, which is related to the density of the protective slag.

[0205] Table 1

[0206] steel grades Cross-sectional specifications Types of protective slag Pull speed benchmark Slag addition benchmark XJ8163VA 320*425mm 8411 0.68 m / min 200g / min XJ8359VA 320*425mm 8341 0.73 m / min 210g / min XJ1313VA 380mm 8241 0.9 m / min 220g / min XJ1346VA 300mm 8341 1.2 m / min 180g / min …… …… …… …… ……

[0207] Table 2

[0208] Types of protective slag Large hopper number protective slag metering parameters 8411 1 4g / r 8341 2 5g / r 8241 3 5.2g / r

[0209] 2) The automatic slag selection module automatically queries the database of the parameter configuration module for the corresponding protective slag type, casting speed benchmark, slag addition benchmark, as well as the corresponding large hopper number and protective slag metering parameters based on the current production plan steel grade and cross-sectional specification information issued by the continuous casting production control system.

[0210] In this example, the current production plan issued by the continuous casting production control system is for steel grade XJ8163VA with a cross-sectional specification of 320*425mm. The target protective slag type is 8411, which can be automatically matched from Table 1 of the parameter configuration module's database. The large hopper number is 1, and the corresponding protective slag metering parameter is 4g / r.

[0211] 3) The automatic slag replenishment module automatically controls the replenishment of slag from the large hopper to the intermediate hopper based on the type of protective slag to be used and the number of the large hopper where it is stored, as well as the actual slag quantity collected in real time from the weighing sensor of the intermediate hopper.

[0212] The automatic slag replenishment process from the large hopper to the intermediate hopper in step 3) includes the following steps:

[0213] (1) Set the upper and lower limits of the slag replenishment amount for the intermediate hopper;

[0214] (2) The actual amount of slag in the intermediate hopper is collected in real time by detecting the slag weight in the intermediate hopper;

[0215] (3) When the slag in the intermediate hopper reaches the lower limit, the corresponding outlet valve of the large hopper, the inlet valve of the intermediate hopper and the air connection valve are automatically opened according to the protective slag type and the large hopper number queried from the automatic slag selection module, and the vacuum conveyor is started to replenish the slag.

[0216] (4) When the slag in the intermediate hopper reaches the upper limit or the slag replenishment amount, the outlet valve of the large hopper, the inlet valve of the intermediate hopper, the vacuum conveyor and the air connection valve will be automatically closed. If the slag is closed because the slag replenishment amount has been reached, the problem of emptying the slag in the slag replenishment pipeline will be involved. Therefore, the corresponding closing sequence is: first, close the outlet valve of the large hopper, and then close the vacuum conveyor, the air connection valve and the inlet valve after keeping them open for the set time.

[0217] In this example, the preset upper limit for slag replenishment in the intermediate hopper is 30kg, and the lower limit is 5kg. The steel grade in the production plan is XJ8163VA, with a cross-sectional specification of 320*425mm. The protective slag type found from the automatic slag selection module is 8411, corresponding to the large hopper number 1#. When the slag volume in the intermediate hopper is less than 5kg, the outlet valve of the large hopper #1, the inlet valve of the intermediate hopper, and the air connection valve are automatically opened, and the vacuum conveyor is started to transport the protective slag from the large hopper to the intermediate hopper through vacuum suction. When the slag volume in the intermediate hopper is greater than 30kg, the outlet valve of the large hopper #1 is automatically closed, and the inlet valve of the intermediate hopper, the vacuum conveyor, and the air connection valve continue to be opened to clear the remaining slag in the slag replenishment pipeline. After the remaining slag in the pipeline is cleared for 15 seconds, the inlet valve of the intermediate hopper, the vacuum conveyor, and the air connection valve are automatically closed, and slag replenishment stops.

[0218] 4) The automatic slag addition module obtains the casting speed benchmark, slag addition amount benchmark, and protective slag metering parameters that match the current production plan from the automatic slag selection module. Based on the changes in the actual casting speed of each stream collected from the continuous casting production control system, it automatically corrects the given speed of the spiral feeder of each stream and adjusts the amount of slag added to each stream crystallizer.

[0219] The given slag addition amount PVset = (Vact / Vref)*PVref fed into each crystallizer, where Vact is the current actual pulling speed, Vref is the pulling speed reference, and PVref is the slag addition amount reference; the given rotational speed n of the screw feeder = PVset / K, where K is the protective slag metering parameter;

[0220] In this example, the consumption rate of the protective slag is directly proportional to the casting speed; the higher the casting speed, the greater the amount of protective slag required. The current planned casting speed baseline Vref = 0.68 m / min, the slag addition baseline PVref = 200 g / min, and the protective slag metering parameter K represents the amount of slag that the screw feeder can deliver per revolution, which is related to the density of the protective slag. In this example, the 8411 protective slag metering parameter K = 4 g / r is used. In this example, due to the lagging steel supply rhythm in the previous process, the actual casting speed of two streams is lower than the standard casting speed: Stream 1 casting speed V1act = 0.58 m / min, and Stream 2 casting speed V2act = 0.6 m / min. After the system collects this casting speed change from the continuous casting production control system, it automatically adjusts the given slag addition amount PVset for these two streams' crystallizers from the baseline slag addition amount of 200 g / min to:

[0221] PV1set=(V1act / Vref)*PVref=(0.58 / 0.68)*200=170.6g / min,

[0222] PV2set=(V2act / Vref)*PVref=(0.6 / 0.68)*200=176.5g / min,

[0223] And automatically adjust the speed n1 of the screw feeder of the first-stage slag feeder and the speed n2 of the screw feeder of the second-stage slag feeder to:

[0224] n1=PV1set / K=170.6 / 4=42.7r / min,

[0225] n2=PV2set / K=176.5 / 4=44.1r / min;

[0226] 5) Repeat steps 2) to 4) until the crystallizer protective slag addition process stops.

[0227] like Figure 2 The corresponding automatic control system for the protective slag of the continuous casting crystallizer shown includes a parameter configuration module, an automatic slag selection module, an automatic slag replenishment module, and an automatic slag addition module;

[0228] The parameter configuration module is the aforementioned configuration database, which is used to pre-configure the corresponding protective slag type, casting speed benchmark and slag addition benchmark according to the various steel grades and cross-sectional specifications produced by the continuous casting machine, as well as to configure the corresponding large hopper number and protective slag metering parameters for each protective slag type.

[0229] The automatic slag selection module is connected to the continuous casting production control system, parameter configuration module, automatic slag replenishment module, and automatic slag addition module to exchange relevant data. Based on the steel grade and cross-sectional specification information of the current production plan issued by the continuous casting production control system, it automatically retrieves the protective slag type, casting speed benchmark, slag addition benchmark, large hopper number, and protective slag metering parameters that match the current production plan from the database of the parameter configuration module and provides them to the automatic slag replenishment module and the automatic slag addition module.

[0230] The automatic slag replenishment module is used for slag replenishment monitoring based on the target slag addition amount. The monitoring is also completed in cooperation with the following peripheral equipment, including: a large hopper (1) corresponding to each type of protective slag; an outlet valve (3) set at the outlet of each large hopper, and a main pipeline (2) connected to each outlet; the outlet of the main pipeline is connected to an intermediate hopper (5) through a vacuum conveyor (4), and an inlet valve (6) and a matching air connection valve (7) are set at the connection position between the outlet of the main pipeline and the vacuum conveyor (4); a resistance strain gauge weighing sensor is also provided in the intermediate hopper. Finally, the slag addition operation is completed by a screw feeder 9 connected between the crystallizer 8 and the intermediate hopper through a pipeline.

[0231] The automatic slag feeding module automatically corrects the given rotational speed of each stream screw feeder 9 and adjusts the amount of slag fed into each stream crystallizer based on the casting speed benchmark, slag amount benchmark, and protective slag metering parameters obtained from the automatic slag selection mold that match the current production plan, as well as the changes in the current actual casting speed of each stream collected from the continuous casting production control system.

[0232] This invention provides an automatic control method for the protective slag in a continuous casting mold. By setting mutually exclusive target slag addition amounts based on casting speed and slag addition amount, as well as target slag addition amounts based on historical data, the method solves the problem of inaccurate control of slag addition during automatic slag addition, making automatic slag addition possible. Furthermore, by establishing a data logic structure consisting of steel grade, cross-sectional specifications, protective slag type, and target slag addition amount, a database for retrieval and matching is created. Additionally, by setting corresponding peripheral equipment and establishing corresponding control logic, the method enables automatic loading of the appropriate slag type and automatic switching between various slag addition operations based on the current production plan. The target slag addition amount based on historical data is determined by the cumulative average historical slag consumption per ton of steel, and this value can be updated iteratively as data accumulates. The target slag addition amount, composed of the casting speed benchmark and the slag addition amount benchmark, serves as a substitute when the data volume is limited and the corresponding average historical slag consumption per ton of steel is not entirely accurate. To ensure that this substitute can ultimately guide the determination of a more accurate target slag addition amount during specific services, the target slag addition amount is finally determined by combining real-time casting speed detection with the target slag addition amount composed of the casting speed benchmark and the slag addition amount benchmark. Simultaneously, the equipment setup, through the installation of a vacuum conveyor and a compatible air connection valve, achieves closed-loop replenishment of protective slag, providing a reliable guarantee for the control of the target slag addition amount. In summary, the present invention provides an automatic control method for the protective slag in a continuous casting crystallizer, which solves the problem that existing technologies still require repeated manual intervention to adjust the type and amount of protective slag, and are prone to production accidents and quality defects due to manual operation errors. This method reduces the workload of operators and improves the intelligence level and labor productivity of the automatic protective slag addition operation.

Claims

1. An automatic control method for the protective slag in a continuous casting crystallizer, characterized in that: The system automatically matches the appropriate protective slag type for the current steel grade, automatically calculates the target slag addition amount for the crystallizer based on the matching, and automatically completes the slag addition according to the calculation. The automatic matching of the appropriate protective slag type for the current steel grade specifically refers to: First, based on the data logic structure of steel grade information, cross-sectional specification information, protective slag type information, and target slag addition amount information, the configuration parameter table is established. Then, each time a production plan is issued, the system performs a matching query between the current production plan's data and the corresponding parameters in the configuration parameter table, based on the steel type and cross-sectional specification information in the production plan. The matching is then completed automatically based on the query results. The configuration parameter table is customizable. The self-iterative method includes data addition based on steel grade information, cross-sectional specification information, protective slag type information, and target slag addition amount information for new steel grades, as well as self-iterative updates of the target slag addition amount for each steel grade. The target slag addition information includes: casting speed benchmark, slag addition benchmark, and predicted slag consumption per ton of steel. The pulling speed benchmark and the slag addition benchmark are logically related, and the two are mutually exclusive with the predicted slag consumption per ton of steel when the configuration parameter table is matched with information. When the number of steel production heats does not reach the set number, the matching is based on the casting speed benchmark and the slag addition benchmark; when the number of steel production heats reaches the set number, the matching is based on the predicted slag consumption per ton of steel. Large hoppers (1) are set up according to the type of protective slag, corresponding to each type. And establish an information table based on the data structure of protective slag type + large hopper number + protective slag metering parameters; The information table forms a tree-like logical structure through the protective slag type and configuration parameter table. The matching query is based on a configuration parameter table containing an information table. Each large hopper is equipped with a discharge pipe leading to the main pipeline (2) and a corresponding outlet valve (3). The outlet of the main pipeline is connected to the intermediate hopper (5) via a vacuum conveyor (4). An inlet valve (6) and a suitable air communication valve (7) are installed at the location where the main pipeline outlet connects to the vacuum conveyor (4) pipeline. The outlet of the intermediate hopper is connected to the crystallizer via a screw feeder pipeline; The automatic addition of slag based on calculations is specifically as follows: Based on the matched type of protective slag and the number of the large hopper, the outlet valve of the corresponding large hopper is opened. Based on the target slag addition amount and the remaining casting time, the amount of slag to be added is delivered to the intermediate hopper. The rotation speed of the screw feeder is set according to the target slag addition amount, and the slag is added via the screw feeder. When the number of steel production furnaces does not reach the set number, the setting of the screw feeder speed based on the target slag addition amount is based on the current casting speed and combined with the corresponding casting speed benchmark and slag addition amount benchmark in the configuration parameter table. Specifically, the target slag addition amount based on the current casting speed is first calculated by the following formula, and then the screw feeder speed is calculated based on the target slag addition amount and protective slag metering parameters. , In the formula, : target amount of slag based on current pulling speed in unit time, unit: g / min; : current actual pulling speed, unit: m / min; : drawing speed reference, in m / min; : set the amount of residue Unit: g / min; : rotational speed of the screw feeder, in r / min; : protective slag metering parameter, in g / r.

2. An automatic control method for the protective slag in a continuous casting crystallizer, characterized in that: The system automatically matches the appropriate protective slag type for the current steel grade, automatically calculates the target slag addition amount for the crystallizer based on the matching, and automatically completes the slag addition according to the calculation. The automatic matching of the appropriate protective slag type for the current steel grade specifically refers to: First, based on the data logic structure of steel grade information, cross-sectional specification information, protective slag type information, and target slag addition amount information, the configuration parameter table is established. Then, each time a production plan is issued, the system performs a matching query between the current production plan's data and the corresponding parameters in the configuration parameter table, based on the steel type and cross-sectional specification information in the production plan. The matching is then completed automatically based on the query results. The configuration parameter table is customizable. The self-iterative method includes data addition based on steel grade information, cross-sectional specification information, protective slag type information, and target slag addition amount information for new steel grades, as well as self-iterative updates of the target slag addition amount for each steel grade. The target slag addition information includes: casting speed benchmark, slag addition benchmark, and predicted slag consumption per ton of steel. The pulling speed benchmark and the slag addition benchmark are logically related, and the two are mutually exclusive with the predicted slag consumption per ton of steel when the configuration parameter table is matched with information. When the number of steel production heats does not reach the set number, the matching is based on the casting speed benchmark and the slag addition benchmark; when the number of steel production heats reaches the set number, the matching is based on the predicted slag consumption per ton of steel. Large hoppers (1) are set up according to the type of protective slag, corresponding to each type. And establish an information table based on the data structure of protective slag type + large hopper number + protective slag metering parameters; The information table forms a tree-like logical structure through the protective slag type and configuration parameter table. The matching query is based on a configuration parameter table containing an information table. Each large hopper is equipped with a discharge pipe leading to the main pipeline (2) and a corresponding outlet valve (3). The outlet of the main pipeline is connected to the intermediate hopper (5) via a vacuum conveyor (4). An inlet valve (6) and a suitable air communication valve (7) are installed at the location where the main pipeline outlet connects to the vacuum conveyor (4) pipeline. The outlet of the intermediate hopper is connected to the crystallizer via a screw feeder pipeline; The automatic addition of slag based on calculations is specifically as follows: Based on the matched type of protective slag and the number of the large hopper, the outlet valve of the corresponding large hopper is opened. Based on the target slag addition amount and the remaining casting time, the amount of slag to be added is delivered to the intermediate hopper. The rotation speed of the screw feeder is set according to the target slag addition amount, and the slag is added via the screw feeder. When the number of steel production furnaces reaches the set number, the setting of the screw feeder speed based on the target slag addition amount is completed based on the current speed and the corresponding predicted slag consumption per ton of steel in the configuration parameter table. Specifically: First, calculate the target slag addition amount based on the current pulling speed using the following formula, and then calculate the rotational speed of the screw feeder based on the target slag addition amount and the protective slag metering parameters. , Target slag addition per unit time based on the current pulling speed, unit: g / min; Current actual pulling speed, unit: m / min; F i : the predicted ton steel slag consumption corresponding to the current steel grade, unit: g / t; D meter : current section specification corresponding to the slab weight, unit t / m; Rotational speed of the screw feeder, unit: r / min; : Metering parameters for protective slag, unit: g / r.

3. The automatic control method for the protective slag in a continuous casting mold according to claim 1 or 2, characterized in that: The self-iterable When the number of steel production furnaces does not reach the set value, only the data based on the steel grade information, cross-sectional specification information, protective slag type information, and target slag addition amount information of the new steel grade is added. When the number of steel production furnaces reaches the set value, the system includes data addition based on the new steel grade information, cross-sectional specification information, protective slag type information, and target slag addition amount information, as well as the automatic updating of the target slag addition amount for each steel grade.

4. The automatic control method for the protective slag in a continuous casting mold according to claim 1 or 2, characterized in that: The self-iteration of target slag addition amount for each steel grade includes the following two types: I. When the number of steel production furnaces reaches a set number, the parameter used to characterize the change in the set slag addition amount; II. When using the predicted slag consumption per ton of steel as a parameter for matching, the predicted slag consumption per ton of steel undergoes its own numerical iteration as the number of heats produced for this steel grade increases.

5. The automatic control method for the protective slag in a continuous casting mold according to claim 1 or 2, characterized in that: The slag addition benchmark is determined based on the unit slag addition amount when the steel grade maintains slag layer balance under the corresponding casting speed benchmark.

6. The automatic control method for the protective slag in a continuous casting mold according to claim 1 or 2, characterized in that: The predicted slag consumption per ton of steel is determined based on the average slag consumption per ton of steel in historical heats for that steel grade.

7. The automatic control method for the protective slag in a continuous casting mold according to claim 1, characterized in that: According to process requirements, an upper limit and a lower limit for slag volume are set for the intermediate hopper. When the amount of slag in the intermediate hopper reaches the set lower limit, the vacuum conveyor, air connection valve, inlet valve and corresponding large hopper outlet valve are triggered to open until the amount of slag in the intermediate hopper reaches the set upper limit or the amount of slag replenishment determined based on the target amount of slag and the remaining casting time. Then the vacuum conveyor, air connection valve, inlet valve and corresponding outlet valve are closed.

8. The automatic control method for the protective slag in a continuous casting mold according to claim 7, characterized in that: A weighing sensor is installed in the intermediate hopper, and the actual amount of slag in the intermediate hopper is monitored by the weighing sensor.

9. The automatic control method for the protective slag in a continuous casting crystallizer according to claim 7, characterized in that: When the slag amount in the intermediate hopper reaches the replenishment amount determined based on the target slag addition amount and the remaining casting time, the outlet valve is immediately closed, and the vacuum conveyor, air connection valve and corresponding inlet valve are closed with a delay within a set time.

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