JPH06285603A - Device for predicting nozzle clogging in continuous casting process line - Google Patents

Abstract

PURPOSE:To suitably execute the exchange of a nozzle. CONSTITUTION:In a device for predicting the nozzle clogging, a second measuring function 13, in which the measured data are updated by output from an average arithmetic circuit plural of each relation between the opening degree of a control valve and a cooling water quantity measuring signal are plotted corresponding to the lapse of days from the date exchanging the nozzle 2 for cooling to record a nozzle use condition graph, and a nozzle clogging graph function 18, in which the nozzle use condition graph recorded in this second measuring data function 13, a nozzle exchanged time graph recorded in a nozzle exchanging time measuring data function and a nozzle use limit graph recorded in a nozzle use limit data function 14 are read out to draw a graph, are provided. Further, a nozzle clogging predicting arithmetic circuit 19 for calculating and predicting the use limit of the nozzle 2 for cooling from the nozzle use condition graph, the nozzle exchanging time graph and the nozzle use limit graph read out with the nozzle clogging graph function is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle clogging prediction device for a continuous casting process line.

[0002]

2. Description of the Related Art Conventionally, in a continuous casting process line, as a method for confirming nozzle clogging in the secondary cooling zone,
The operator confirmed that the nozzle was clogged while performing the process and the product was affected, and then the nozzle was replaced promptly or the process line was stopped and then a constant flow rate was supplied to this secondary cooling zone. However, in the method of replacing after causing nozzle clogging, it is naturally impossible to perform cooling on the slab to be cooled because nozzle clogging has occurred, so it is possible to replace it after replacement.
The product is adversely affected, and in the worst case, the plant must be stopped and replaced, which causes great damage to the plant. In addition, in the method in which the operator confirms by flowing a constant flow rate to the secondary cooling zone after the process line is stopped, there is no slab when confirming by flowing a constant flow rate to the secondary cooling zone after the process line is stopped. However, since a large amount of cooling water flows, it is economically inefficient and requires the operator to check each time, which is labor-intensive, and the continuous casting equipment is stopped every day due to the continuously operating process line. However, there is a problem that nozzle clogging does not always occur before the next stop and reliable confirmation cannot be performed.

[0003]

SUMMARY OF THE INVENTION In order to solve the drawbacks of the prior art, the present invention is to confirm the flow rate and the opening flowing in the cooling zone at the time of nozzle replacement and set the opening and the flow rate as the nozzle clogging limit. History management of the flow rate and opening during normal process line operation is performed to predict the nozzle clogging tendency and the date and time when nozzle replacement is required, and predict the scheduled replacement date in advance to perform planned replacement. It is possible to eliminate the adverse effect on the product. We also provide a nozzle clogging prediction device for continuous casting process lines that can reduce the operator's labor because the tendency of nozzle clogging during normal operation can be reduced, and can also be economically reduced because cooling water does not flow when there is no cast piece. The purpose is to do.

[0004]

A nozzle clogging prediction device for a continuous casting process line according to the present invention comprises a cooling nozzle for spraying cooling water on a slab sent in the continuous casting process line, and a cooling water flow rate. A cooling water amount measuring device for measuring the cooling water amount, and a cooling water amount adjusting signal for adjusting the supply amount to be supplied to the cooling nozzle by comparing the cooling water amount measuring signal output from the cooling water amount measuring device with a predetermined cooling water amount setting value. Of the cooling water amount, the cooling water amount control valve that adjusts the control valve opening by the cooling water amount control signal output from this cooling water amount controller, the date when the cooling nozzle was replaced, and the adjustment at the date of this replacement Plot the relationship between the valve opening and the cooling water amount measurement signal and record the graph during nozzle replacement. Relatedly, the nozzle usage limit data function of recording a nozzle usage limit graph by presetting and plotting, and plotting and recording the relationship between the control valve opening degree and the cooling water amount measurement signal at each preset time A measurement data function, an average value calculation circuit that calculates an average value from one day's recording output from the first measurement data function, and a cooling nozzle that updates the measurement data by the output from this average value calculation circuit. A second measurement data function that plots the relationship between the control valve opening and the cooling water amount measurement signal in the number of days that have elapsed since the date when the replacement was made, and records the nozzle usage state graph, and records this in the second measurement data function. Nozzle usage status graph and nozzle replacement limit data recorded in the nozzle replacement measurement data function and nozzle usage limit data recorded in the nozzle usage limit data function Nozzle clogging graph function that reads out and plots the nozzle, and nozzle that predicts by calculating the usage limit of the cooling nozzle from the nozzle usage status graph, nozzle replacement graph, and nozzle usage limit graph read by this nozzle clogging graph function It is characterized by including a clogging prediction calculation circuit.

[0005]

In the nozzle clogging predicting device of the continuous casting process line according to the present invention, cooling water is sprinkled on the slab sent in the continuous casting process line to cool, and the flow rate of the cooling water is measured. Outputs a cooling water amount control signal that compares the output cooling water amount measurement signal with a preset cooling water amount setting value and adjusts the supply amount supplied to the cooling nozzle, and adjusts the cooling water amount output from the cooling water amount controller. The control valve opening is adjusted by the signal, and the date when the cooling nozzle was replaced and the relationship between the control valve opening and the cooling water amount measurement signal on this replacement date were plotted to record the nozzle replacement graph. The use limit of the control valve is preset and plotted in relation to the control valve opening, the nozzle use limit graph is recorded, and the relationship between the control valve opening and the cooling water amount measurement signal at each predetermined time is created. Turned into recorded and calculates an average value from the recording of one day which is output from the first measurement data functions,
Update the measurement data by the output from the average value calculation circuit and plot the relationship between the control valve opening and the cooling water amount measurement signal in the number of days elapsed from the date when the cooling nozzle was replaced and record the nozzle usage state graph, The nozzle usage status graph recorded in the second measurement data function and the nozzle replacement graph recorded in the measurement data function and the nozzle usage limit graph recorded in the nozzle usage limit data function are read out and plotted. The usage limit of the cooling nozzle is calculated and predicted from the nozzle usage status graph, the nozzle replacement graph, and the nozzle usage limit graph read by the clogging graph function.

[0006]

EXAMPLE An example of the present invention will be described below. In FIG. 1, 2 is a cooling nozzle for spraying and cooling cooling water on a slab 1 sent in a continuous casting process line, 3 is a cooling water amount measuring device for measuring the flow rate of cooling water, and 5 is a cooling water amount measuring device 3.
A cooling water amount controller that outputs a cooling water amount adjusting signal for adjusting the supply amount supplied to the cooling nozzle 2 by comparing the cooling water amount measuring signal output from
Reference numeral 4 denotes a cooling water amount control valve for adjusting the control valve opening degree by a cooling water amount control signal output from the cooling water amount controller 5, 13 denotes a date when the cooling nozzle 2 was replaced, and a control valve opening degree and cooling at the replacement date. Nozzle replacement measurement data function for plotting the relationship with the water amount measurement signal and recording the graph during nozzle replacement. Reference numeral 14 designates the use limit of the cooling nozzle 2 in advance in relation to the control valve opening degree and plots the nozzle for use. Nozzle usage limit data function recording a limit graph, 15 is a first measurement data function for plotting and recording the relationship between the control valve opening and the cooling water amount measurement signal at each predetermined time, 1
6 is an average value calculation circuit for calculating an average value from the recording for one day output from the measurement data function 15, and 17 is a date when the measurement data is updated by the output from the average value calculation circuit 16 and the cooling nozzle 2 is replaced. A second measurement data function for plotting the relationship between the control valve opening and the cooling water amount measurement signal in the number of days elapsed since
Reference numeral 18 reads and draws the nozzle use state graph recorded in the measurement data function 17, the nozzle replacement graph recorded in the nozzle replacement measurement data function 13, and the nozzle usage limit graph recorded in the nozzle usage limit data function 14. Nozzle clogging graph function, 19 is a nozzle clogging prediction calculation circuit for calculating and predicting the usage limit of the cooling nozzle 2 from the nozzle usage state graph, the nozzle replacement graph, and the nozzle usage limit graph read by the nozzle clogging graph function 18. In the cooling water discharge nozzle used in the cooling equipment such as continuous casting process line, the data of the cooling water flow rate from the discharge nozzle and the control valve opening is collected, and the deterioration rate related to day clogging is collected. By calculating
A nozzle clogging prediction device capable of calculating the usage limit of a discharge nozzle and predicting an appropriate replacement timing of the discharge nozzle.

That is, as shown in FIG. 1, in the continuous casting process line, the cooling water flow rate measuring device 3, the cooling water flow rate control valve 4, the cooling water flow rate control is performed on the slab 1 in the secondary cooling zone control process line. The cooling water adjusted by using the vessel 5 passes through the cooling nozzle 2 and is discharged to the slab 1.
At this time, since it is usually impossible to predict whether or not nozzle clogging has occurred in the cooling nozzle 2, the nozzle clogging predicting device 6 is used and the cooling water flow rate measuring device 3 and the cooling water flow rate adjusting device 5 are used. The adjusted control signal to the cooling water flow rate control valve 4 is input to the nozzle clogging prediction device 6 to perform prediction.

The processing in the nozzle clogging predicting device with the contents shown in FIG. 1 carries out the prediction of the nozzle clogging with the following contents. That is, as shown in the flow chart of the nozzle clogging prediction device, the flow rate value measured by the flow rate transmitter and the opening of the flow rate control valve are designated (n1 ... nn) as nozzle exchange data A in FIG. The flow rate at the time of opening is measured, and the data is stored as the measurement data at the time of nozzle replacement together with the date of measurement in the nozzle clogging prediction device (the data at the time of nozzle replacement is updated every time the nozzle is replaced).

Next, the nozzle clogging limit C shown in FIG. 2 is manually set as the nozzle usage limit value data at each nozzle opening n1 ... nn when the nozzle is replaced, and the data is stored in the nozzle clogging prediction device.

After setting the data at the time of exchanging the nozzle and the data of the limit value of the nozzle usage, when the normal continuous casting process line is operated, the measured data B shown in FIG. The cooling water flow rate is measured for each opening degree of nn, and the measured data is stored as data for a database for one day.

After the measurement data is measured for one day, an average value calculation is used to calculate the average value of the cooling water flow rate for each opening of n1 ... nn, and the measurement data (for one day) is used to calculate the opening and the average value. Register as a database record together with the date when the cooling water flow rate was measured.

When the measurement data (for one day) is registered in the database, it is determined that the date has been updated, and the measurement data (for one day), the measurement data at the time of nozzle replacement, and the nozzle use limit value data are used for the nozzle clogging graph. Then, the nozzle clogging calculation is performed and the nozzle clogging prediction display is performed.

The content of the nozzle clogging prediction display based on the nozzle clogging calculation will be described below with reference to the nozzle clogging graph of FIG.

(1) An angle is obtained from the nozzle clogging limit value data C by using the trigonometric method SIN ^-1 for each specified opening degree n1 ... nn.

N1 ... nn (specified opening) θ1 ... θn (nozzle clogging limit value angle) Nozzle clogging limit angle θ by averaging after obtaining the angle
Calculate a.

(2) The angle is determined from the data A at the time of nozzle replacement by using the trigonometric method SIN ^-1 for each specified opening degree n1 ... nn.

N1 ... nn (specified opening) θ1 ... θn (angle during nozzle replacement) After calculating the angle, the average calculation is performed and the nozzle replacement angle θb
To calculate.

(3) From the measured data (for one day) B, the angle is determined for each specified opening degree n1 ... nn using trigonometry SIN ^-1 .

N1 ... nn (specified opening) θ1 ... θn (measurement data (for one day) angle) After obtaining the angle, average calculation is performed to calculate the measurement data (for one day) angle θc. .

(4) Measurement data (for one day) The angle θd is calculated from the angle θc and the nozzle replacement angle θb as follows.

Θb-θc = θd (5) Measurement data (for one day) From the angle θc and the nozzle clogging limit angle θa, the angle θe is calculated as follows.

[Theta] c- [theta] a = [theta] e (6) From the date when the measurement data (for one day) was carried out and the date when the nozzle replacement data was measured, the number of days varied as follows is calculated.

Date of measurement data (for one day) -Date of nozzle replacement data Date = Date of fluctuation (7) θd / θe × Days of fluctuation + Current date = Planned date of nozzle replacement

[0024]

EFFECTS OF THE INVENTION In the continuous casting process line according to the present invention, it is planned to replace the nozzle in advance in a hurry after the nozzle is clogged and the product is affected while the process is being carried out in the secondary cooling zone nozzle clogging confirmation. Since the day is displayed and planned replacement is performed, the worst situation such as process line stop can be avoided and the operator can apply a constant flow rate to the secondary cooling zone after the process line, which was conventionally performed by the operator, is stopped. The inefficiency to be confirmed reduces the labor of the operator and saves the cooling water.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a nozzle clogging prediction device showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing the operation of FIG.

FIG. 3 is an explanatory view showing the operation of FIG.

[Explanation of symbols]

 13 Nozzle replacement measurement data function 14 Nozzle usage limit data function 18 Nozzle clogging graph function 19 Nozzle clogging prediction calculation circuit

Claims (1)

[Claims] 1. A cooling nozzle for spraying and cooling cooling water on a slab sent in a continuous casting process line, a cooling water amount measuring device for measuring the flow rate of the cooling water, and an output from this cooling water amount measuring device. And a cooling water amount controller for outputting a cooling water amount adjusting signal for adjusting the supply amount to be supplied to the cooling nozzle by comparing the cooling water amount measuring signal with a predetermined cooling water amount set value, and outputting from this cooling water amount controller The cooling water amount control valve for adjusting the control valve opening degree by the cooling water amount control signal, the date when the cooling nozzle is replaced, and the relationship between the control valve opening degree and the cooling water amount measurement signal on the replaced date. Nozzle replacement measurement data function that plots and records a graph when nozzle replacement, and the usage limit of the cooling nozzle is determined in advance in relation to the control valve opening, and the nozzle usage limit graph is created. A nozzle use limit data function that records a rough, a first measurement data function that plots and records the relationship between the control valve opening degree and the cooling water amount measurement signal for each predetermined time, and the first measurement An average value calculation circuit that calculates the average value from the recording of one day output from the data function, and the number of days that have elapsed since the date when the cooling nozzle was replaced by updating the measurement data with the output from this average value calculation circuit. A second measurement data function for plotting the relationship between the control valve opening degree and the cooling water amount measurement signal in FIG. 2 to record a nozzle usage status graph, and the nozzle usage status graph recorded in the second measurement data function. And the nozzle replacement graph recorded in the nozzle replacement measurement data function and the nozzle usage limit graph recorded in the nozzle usage limit data function. A nozzle clogging graph function of projecting and plotting, and a usage limit of the cooling nozzle is calculated from the nozzle usage status graph, the nozzle replacement graph, and the nozzle usage limit graph read by the nozzle clogging graph function. A nozzle clogging prediction device for a continuous casting process line, comprising a nozzle clogging prediction calculation circuit for prediction.