KR102110667B1 - Apparatus and method for managing aluminum concentration of cgl plating pot - Google Patents

Abstract

The present invention relates to a device for managing the aluminum concentration of a CGL plating bath, in a plating facility operating a pre-melting bath (P-Pot) for providing an aluminum solution to the main plating bath (M-Pot), CGL (continuous from the upper control unit) galvanizing line) a work instruction input unit for receiving a work instruction; Predict or calculate the aluminum (Al) consumption by order plating amount based on the CGL work instruction information, predict or calculate the change in the aluminum (Al) concentration of the main plating bath (M-Pot), and also set a preset line A control unit for determining an ingot type for maintaining an aluminum concentration target according to the aluminum (Al) concentration management standard of the star plating bath (Pot); And when the ingot (Ingot) type is determined, according to the control of the control unit, the pre-melting bath (P-Pot) ingot of the determined type of ingot (Ingot) to inject or instruct to inject; includes a .

Description

Aluminum concentration control device and method for CGL plating bath {APPARATUS AND METHOD FOR MANAGING ALUMINUM CONCENTRATION OF CGL PLATING POT}

The present invention relates to an apparatus and a method for managing the aluminum concentration of a CGL plating bath, and more specifically, to calculate the aluminum consumption rate according to the thickness difference of the plating layer according to the plating amount of the CGL (continuous galvanizing line, continuous hot-dip galvanized steel production line). By predicting the aluminum (Al) concentration in (Pot), and selecting and injecting the ingot type according to the predicted aluminum concentration in the plating bath (Pot), it is possible to perform aluminum concentration management in the plating bath. The present invention relates to an apparatus and method for managing an aluminum concentration in a CGL plating bath.

In general, a galvanized steel sheet production facility (CGL: Continuous galvanizing line) is a production facility that produces a coating of molten zinc by dipping a steel sheet (metal strip) in a zinc melt of a hot dip galvanizing bath to protect the surface of the steel sheet and prevent rust. to be.

The hot-dip galvanizing bath contains a zinc plating solution, so that the steel sheet continuously supplied through the snout rolls up a rotating roll (sink roll), and then zinc plating is performed through the zinc plating solution.

Recently, alloy plating is performed in which aluminum (Al) is added to a zinc plating bath in order to secure surface quality and plating adhesion of hot dip galvanized products.

At this time, if the solubility of iron (Fe) in the plating bath changes or varies depending on the temperature and aluminum (Al) concentration of the plating bath, excess iron (Fe) with a higher solubility reacts with aluminum (Al) or zinc (Zn). Therefore, dross occurs.

Therefore, it is necessary to perform concentration control so that there is no variation in the concentration of aluminum (Al), but if the ordered plating amount by product varies, there is a variation in the amount of aluminum consumed by the amount of plating, which makes it difficult to control the aluminum concentration, and also the pre-melting bath ( When operating the premelting pot, it has difficulty in responding to the concentration in real time due to low concentration reactivity compared to the direct ingot injection method.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 2002-0041107 (July 15, 2002, aluminum concentration control device and method for hot dip galvanizing bath).

According to an aspect of the present invention, the present invention predicts the aluminum concentration in the plating bath (Pot) by calculating the aluminum consumption rate according to the thickness difference of the plating layer for each plating amount of the continuous galvanizing line (CGL). An aluminum concentration management apparatus and method for a CGL plating bath, which enables to perform an aluminum concentration management in a plating bath by selecting and injecting an ingot type according to the predicted aluminum concentration in the plating bath (Pot) Is to provide.

The apparatus for managing the aluminum concentration of a CGL plating bath according to an aspect of the present invention, in a plating facility operating a pre-melting bath (P-Pot) for providing an aluminum solution to the main plating bath (M-Pot), CGL from the upper control unit (continuous galvanizing line) a work instruction input unit that receives a work instruction; Predict or calculate the aluminum (Al) consumption by order plating amount based on the CGL work instruction information, predict or calculate the change in the aluminum (Al) concentration of the main plating bath (M-Pot), and also set a preset line A control unit for determining an ingot type for maintaining an aluminum concentration target according to the aluminum (Al) concentration management standard of the star plating bath (Pot); And when the ingot (Ingot) type is determined, under the control of the control unit, the pre-melting bath (P-Pot) ingot of the determined type of ingot (Ingot) to inject or instruct to inject; It is characterized by.

In the present invention, the work order data received by the work order input unit, input order information of the steel sheet; As characteristic information of each steel sheet to be input, thickness, width, material, and weight information; And order information, including order thickness, order width, and plating amount.

In the present invention, the control unit, through ({(①Thk * Al%) + (②Thk * Al%)} / (①Thk + ②Thk)), predicts the consumption of aluminum (Al) by order plating amount, wherein "①Thk "And" ②Thk "is characterized by being the thickness of the inhibition layer (①) and the plating layer (②) formed on the steel sheet.

In the present invention, when plating is performed on a steel sheet, an inhibition layer (①) and a plating layer (②) are sequentially formed on the steel sheet, and the inhibition layer (①) is aluminum. When the concentration is 0.2%, regardless of the amount of plating ordered, it is created with the same thickness of 50 nm, and the thickness (µm) of the plating layer (②) is characterized as having a “plating amount / specific gravity”.

In the present invention, the control unit, ({(M-Pot Al total amount + incoming P-Pot Al amount)-(Order plating amount or Al consumption by Dross)) / (M-Pot total capacity), the main plating It is characterized by predicting or calculating a change in the aluminum (Al) concentration of the bath (M-Pot).

In the method of managing the aluminum concentration of the CGL plating bath according to another aspect of the present invention, in a plating facility operating a pre-melting bath (P-Pot) providing an aluminum solution to the main plating bath (M-Pot), the control unit is the upper control unit. Receiving a CGL (continuous galvanizing line) work instruction from a computer; The controller predicting or calculating aluminum (Al) consumption by order plating amount based on CGL work instruction data; If the consumption amount of aluminum (Al) for each order plating amount is predicted, the controller predicts or calculates a change in the concentration of aluminum (Al) in the main plating bath (M-Pot); When a change in the aluminum (Al) concentration of the main plating bath (M-Pot) is predicted or calculated, the control unit maintains an aluminum concentration target according to a preset aluminum (Al) concentration management standard of the plating bath for each line (Pot). Determining an ingot type to be performed; And when the ingot type is determined, instructing the controller to inject or inject the determined type of ingot into the pre-melting bath (P-Pot).

In the present invention, in the step of predicting or calculating the consumption of aluminum (Al) for each order plating amount, the control unit ({(①Thk * Al%) + (②Thk * Al%)} / (①Thk + ②Thk)) Through this, the consumption of aluminum (Al) by order of plating is predicted, wherein "①Thk" and "②Thk" are characterized by the thickness of the inhibition layer (①) and the plating layer (②) formed on the steel sheet.

In the present invention, in the step of predicting or calculating the change in the aluminum (Al) concentration of the main plating bath (M-Pot), the control unit, ({(Total amount of M-Pot Al + amount of incoming P-Pot Al)- It is characterized by predicting or calculating a change in the aluminum (Al) concentration of the main plating bath (M-Pot) through (order plating amount or Al consumption by dross)} / (total capacity of M-Pot).

According to one aspect of the present invention, the present invention calculates the aluminum (Al) consumption rate according to the thickness difference of the plating layer for each plating amount of a continuous galvanizing line (CGL) to predict the aluminum concentration in the plating bath (Pot), and the predicted plating bath ( By selectively injecting the type of ingot according to the Al concentration in the pot, it is possible to perform the target aluminum (Al) concentration management, thereby reducing the amount of dross generated by reducing the deviation in the concentration of the plating bath and dross defects. It has the effect of helping to improve.

1 is an exemplary view showing a schematic configuration of an aluminum concentration management device of a CGL plating bath according to an embodiment of the present invention.
FIG. 2 is an exemplary view of FIG. 1 in which data for each process according to a CGL work instruction is displayed in a table form.
Figure 3 is a flow chart for explaining the aluminum concentration management method of the CGL plating bath according to an embodiment of the present invention.
FIG. 4 is an exemplary view for explaining a method for predicting an aluminum (Al) consumption by order plating amount in FIG. 1.
5 is an exemplary view showing the ingot type input criteria according to the aluminum concentration standards for each plating bath (eg, M-Pot, P-Pot) in FIG. 1 in the form of a table.

Hereinafter, an embodiment of an apparatus and method for managing an aluminum concentration of a CGL plating bath according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition of these terms should be made based on the contents throughout the specification.

1 is an exemplary view showing a schematic configuration of an aluminum concentration management device of a CGL plating bath according to an embodiment of the present invention.

As shown in FIG. 1, the aluminum concentration management device of the CGL plating bath according to the present embodiment includes a work instruction input unit 110, a control unit 120, and an ingot input unit 130.

The work instruction input unit 110 receives a CGL work instruction from an upper control unit (not shown) (see FIG. 2).

FIG. 2 is an exemplary view illustrating data for each process according to a CGL work instruction in a table form in FIG. 1.

For example, referring to FIG. 2, the CGL work order data received from the upper control unit (not shown) by the work order input unit 110 includes input order information of a coil (ie, steel sheet) and each coil (ie, steel sheet) to be input. It includes the characteristic information (eg, thickness, width, material, weight, etc.), and order information (eg, order thickness, order width, plating amount, etc.).

The controller 120 predicts (or calculates) the consumption of aluminum (Al) for each plating amount based on the CGL work instruction information (see FIG. 4).

FIG. 4 is an exemplary view for explaining a method for predicting an aluminum (Al) consumption by order plating amount in FIG. 1.

As shown in FIG. 4, when plating is performed on a steel sheet, an inhibition layer (①) and a plating layer (②) are sequentially formed on the steel sheet.

At this time, the inhibition layer (①) is produced with the same thickness of 50 nm regardless of the order plating amount when the aluminum concentration is 0.2%. And the thickness (㎛) of the plating layer (②) has a "plating amount / specific gravity".

Accordingly, the control unit 120 predicts the consumption of aluminum (Al) by order plating amount through ({(①Thk * Al%) + (②Thk * Al%)} / (①Thk + ②Thk)). Here, "①Thk" and "②Thk" mean the thickness of the inhibition layer (①) and the plating layer (②) formed on the steel sheet.

When the consumption amount of aluminum (Al) by order plating amount is predicted as described above, the controller 120 can predict the amount of ingot by CGL work instruction by the amount of aluminum (Al) consumption by order plating amount.

As described above, if the consumption of aluminum (Al) by order of plating amount (or ingot required by CGL work order) is predicted, the control unit 120 predicts the change in the concentration of aluminum (Al) in the main plating bath (M-Pot). (Or calculate).

At this time, in this embodiment, it is assumed that a pre-melting bath (P-Pot) for providing an aluminum solution to the main plating bath (M-Pot) is operated, and the main plating bath is maintained at the same level.

Accordingly, the control unit 120, ({(M-Pot Al total amount + incoming P-Pot Al amount)-(Order plating amount or Al consumption by Dross)) / (M-Pot total capacity (ton)) through , Predict (or calculate) the change in the aluminum (Al) concentration of the main plating bath (M-Pot).

When the aluminum (Al) concentration change of the main plating bath (M-Pot) is predicted (or calculated) as described above, the control unit 120 manages the aluminum (Al) concentration management standard of the plating bath (Pot) for each line. According to this, an ingot type for holding an aluminum concentration target (eg, 0.2%) is determined (see FIG. 5).

FIG. 5 is an exemplary view showing the ingot type input standard according to the aluminum concentration standard for each plating bath (eg, M-Pot, P-Pot) in FIG. 1.

Referring to FIG. 5, the aluminum concentration of the main plating bath (M-Pot) is less than the first criterion (eg, 0.197%) or the aluminum concentration of the pre-melting plating bath (P-Pot) is the second criterion (eg, 0.40). If less than%), H2 (0.51%) type ingot is added, and the aluminum concentration of the main plating bath (M-Pot) is higher than the first standard (e.g. 0.197%) and smaller than the third standard (e.g. 0.204%). If H4 (0.30%) type ingot is added, the aluminum concentration of the main plating bath (M-Pot) is higher than the third standard (e.g. 0.204%) or the aluminum concentration of the pre-melting plating bath (P-Pot) is 4 If it is above the standard (eg 0.25%), inject P (pure) type.

However, the ingot type input standard according to the aluminum concentration standard for each plating bath (eg, M-Pot, P-Pot) shown in FIG. 5 is illustratively described for explanation. Therefore, it should be noted that the aluminum concentration standard and the ingot type input standard according to the aluminum concentration management standard of the plating bath for each line may also vary.

When the ingot type is determined as described above, the controller 120 injects or injects the determined type of ingot into the pre-melting bath P-Pot through the ingot inlet 130. Instructs.

As described above, this embodiment reduces the aluminum concentration variation by inputting the ingot type determined according to the aluminum consumption rate (%) per work instruction and the aluminum concentration prediction value of the main plating bath (M-Pot) and the pre-melting plating bath (P-Pot). To be able to.

3 is a flowchart for explaining a method of managing aluminum concentration of a CGL plating bath according to an embodiment of the present invention.

As illustrated in FIG. 3, the controller 120 receives a CGL work instruction from an upper controller (not shown) (S101).

At this time, the CGL work instruction data includes: coil (ie, steel plate) input order information, characteristic information of each coil (ie, steel plate) to be input (eg, thickness, width, material, weight, etc.), and order information (eg: Order thickness, order width, plating amount, etc.).

Accordingly, the controller 120 predicts (or calculates) the consumption of aluminum (Al) for each plating amount based on the CGL work instruction data (S102).

For example, when plating is performed on a steel sheet, an inhibition layer (①) and a plating layer (②) are sequentially formed on the steel sheet. Accordingly, the control unit 120 predicts the consumption of aluminum (Al) by order plating amount through ({(①Thk * Al%) + (②Thk * Al%)} / (①Thk + ②Thk)). Here, "①Thk" and "②Thk" mean the thickness of the inhibition layer (①) and the plating layer (②) formed on the steel sheet.

As described above, if the consumption of aluminum (Al) by order of plating amount (or the amount of ingot required by CGL work order) is predicted, the controller 120 predicts the change in the concentration of aluminum (Al) in the main plating bath (M-Pot). (Or calculation) (S103).

For example, the control unit 120, ({(M-Pot Al total amount + incoming P-Pot Al amount)-(order plating amount or Al consumption by Dross)) / (M-Pot total capacity (ton)), Prediction (or calculation) of the change in the aluminum (Al) concentration of the main plating bath (M-Pot).

When the change in the aluminum (Al) concentration of the main plating bath (M-Pot) is predicted (or calculated) as described above, the control unit 120 sets the aluminum (Al) concentration of the plating bath (Pot) for each line set in advance. According to the management standard, an ingot type for maintaining an aluminum concentration target (eg, 0.2%) is determined (S104).

At this time, it is noted that the ingot type input standard according to the aluminum concentration standard for each plating bath (for example, M-Pot, P-Pot) may vary depending on the embodiment.

When the ingot type is determined as described above, the controller 120 instructs the pre-melting bath (P-Pot) to inject or inject the determined ingot (S105).

As described above, this embodiment predicts the aluminum concentration in the plating bath (Pot) by calculating the consumption rate of aluminum (Al) according to the plating layer thickness difference for each plating amount of the continuous galvanizing line (CGL), and the Al in the predicted plating bath (Pot). By selectively injecting the type of ingot according to the concentration, it is possible to perform the target aluminum (Al) concentration management, thereby reducing the amount of dross and reducing defects by reducing the deviation in the concentration of the plating bath. It works.

The present invention has been described above with reference to the embodiment shown in the drawings, but this is only exemplary, and those skilled in the art to which the art pertains may have various modifications and other equivalent embodiments. You will understand the point. Therefore, the technical protection scope of the present invention should be defined by the following claims.

110: work order input unit
120: control unit
130: ingot input

Claims (8)

In a plating facility operating a pre-melting bath (P-Pot) for providing an aluminum solution to the main plating bath (M-Pot), a work instruction input unit that receives a continuous galvanizing line (CGL) work instruction from an upper control unit;
Predict or calculate the aluminum (Al) consumption by order plating amount based on the CGL work instruction information, predict or calculate the change in the aluminum (Al) concentration of the main plating bath (M-Pot), and also set a preset line A control unit for determining an ingot type for maintaining an aluminum concentration target according to the aluminum (Al) concentration management standard of the star plating bath (Pot); And
When the type of the ingot (Ingot) is determined, under the control of the control unit, the pre-melting bath (P-Pot) ingot of the determined type of ingot (Ingot) to inject or instruct to inject; includes,
The control unit,
({(①Thk * Al%) + (②Thk * Al%)} / (①Thk + ②Thk)), predict the consumption of aluminum (Al) by order plating amount,
Here, "①Thk" and "②Thk" are aluminum concentration management devices of the CGL plating bath, characterized in that the thickness of the inhibition layer (①) and the plating layer (②) formed on the steel sheet.
According to claim 1, The work order data received by the work order input unit,
Steel sheet input order information;
As characteristic information of each steel sheet to be input, thickness, width, material, and weight information; And
An aluminum concentration management device for a CGL plating bath, characterized in that it includes order thickness, order width, and plating amount as order information.
delete According to claim 1,
When plating is performed on the steel sheet, an inhibition layer (①) and a plating layer (②) are sequentially formed on the steel sheet,
The inhibition layer (①) is produced with the same thickness of 50 nm regardless of the order plating amount when the aluminum concentration is 0.2%, and the thickness (㎛) of the plating layer (②) has a "plating amount / specific gravity" Aluminum concentration management device of the CGL plating bath, characterized in that.
According to claim 1, The control unit,
({(Total amount of M-Pot Al + amount of incoming P-Pot Al)-(Order plating amount or Al consumption by Dross)}} / (Total amount of M-Pot), aluminum of main plating bath (M-Pot) Al) A device for managing the aluminum concentration of a CGL plating bath, characterized in that the concentration change is predicted or calculated.
In a plating facility operating a pre-melting bath (P-Pot) providing an aluminum solution to the main plating bath (M-Pot), the control unit receives a continuous galvanizing line (CGL) work instruction from an upper control unit;
The controller predicting or calculating aluminum (Al) consumption by order plating amount based on CGL work instruction data;
When the consumption amount of aluminum (Al) for each order plating amount is predicted, the controller predicts or calculates a change in the concentration of aluminum (Al) in the main plating bath (M-Pot);
When a change in the aluminum (Al) concentration of the main plating bath (M-Pot) is predicted or calculated, the control unit maintains an aluminum concentration target according to a preset aluminum (Al) concentration management standard of the plating bath for each line (Pot). Determining an ingot type to be performed; And
When the type of the ingot (Ingot) is determined, instructing the control unit to inject or inject the ingot of the determined type into the pre-melting bath (P-Pot).
In the step of predicting or calculating the consumption of aluminum (Al) for each order plating amount,
The control unit,
({(①Thk * Al%) + (②Thk * Al%)} / (①Thk + ②Thk)), predict the consumption of aluminum (Al) by order plating amount,
Here, "①Thk" and "②Thk" are aluminum concentration management methods of the CGL plating bath, characterized in that the thickness of the inhibition layer (①) and the plating layer (②) formed on the steel sheet.
delete According to claim 6, In the step of predicting or calculating a change in the aluminum (Al) concentration of the main plating bath (M-Pot),
The control unit,
({(Total amount of M-Pot Al + amount of incoming P-Pot Al)-(Order plating amount or Al consumption by Dross)}} / (Total amount of M-Pot), aluminum of main plating bath (M-Pot) Al) A method for managing the aluminum concentration of a CGL plating bath, characterized in that the concentration change is predicted or calculated.

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