KR100660213B1 - A method for calibrating emissivity of radiation thermometer in cold alloy process - Google Patents

Abstract

A method for calibrating the emissivity of radiation of a thermometer in a cold alloy process is provided to improve the preciseness of the thermometer by accurately correcting the emissivity by on-line. A method for calibrating the emissivity of radiation of a thermometer in a cold alloy process includes the steps of: correcting the emissivity of radiation of a first thermometer by applying a first equation(S110); correcting the emissivity of radiation of a second thermometer by applying a second equation(S120); correcting the emissivity of radiation of a third thermometer by applying a third equation(S130); and correcting the emissivity of radiation of a fourth thermometer by applying a fourth equation(S140). The fourth thermometer is installed at the outlet side of an alloy cooling die.

Description

A method for correcting the emissivity of a radiation thermometer in a cold rolled alloying process {A METHOD FOR CALIBRATING EMISSIVITY OF RADIATION THERMOMETER IN COLD ALLOY PROCESS}

1 is a block diagram of a conventional continuous annealing furnace temperature control device.

2 is a block diagram of an apparatus for correcting an emissivity of a cold rolled alloying process for carrying out the present invention.

Figure 3 is a flow chart showing a method of correcting the emissivity of the radiation thermometer according to the present invention.

4 is a view for explaining the emissivity correction process of FIG.

Explanation of symbols on the main parts of the drawings

10: emissivity correction control unit 20: database

30: I / O interface 40: data I / O section

50: alloying degree measuring system 60: thickness gauge

CAL: Annealing Process P11: First Radiation Thermometer

P12: 2nd radiation thermometer P20: 1st reference radiation thermometer

P13: 3rd radiation thermometer P14: 4th radiation thermometer

The present invention relates to a method for correcting the emissivity of a radiation thermometer applied to a cold rolled alloying process of an ironworks, in particular, in the cold rolled alloying process of an ironworks, to accurately correct the emissivity of a material of an emissometer on-line, thereby improving the measurement accuracy of the radiometer. Accordingly, the present invention relates to a method for correcting the emissivity of a radiation thermometer of a cold rolled alloying process capable of reducing an error in measuring a radiation temperature of a cold rolled coil and reducing an emissivity fluctuation regardless of a change in steel grade for each measurement position.

In general, the alloying process of the cold rolling process in the steel mill consists of plating the surface of the cold-rolled material and alloying the plated cold-rolled material.

The plating and alloying quality of the alloying process is directly related to the plate temperature control of cold rolled materials. In order to control the plate temperature of cold rolled materials, the plate temperature of the cold rolled materials is measured by using a radiant thermometer, and each unit process is based on the measured plate temperatures. Control the pan temperature.

However, in the alloying process, since the variation of the emissivity of the surface of the material varies with each material position as the alloying process proceeds, a measurement error of the radiation thermometer due to the variation of the material emissivity is greatly caused.

Accordingly, in order to correct the change in the emissivity of the material according to the degree of oxidation, the method as shown in FIG. 1 has been applied to the emissivity correction.

1 is a block diagram of a conventional continuous annealing furnace temperature control device.

In the continuous annealing furnace temperature control apparatus shown in FIG. 1, the signal conversion unit 10 transmits the measured temperature by applying a preset primary emissivity to the output signal of the radiation thermometer 8-1, and the measurement is performed through actual experiments. The temperature compensation unit 20 stores the emissivity for each work material and calculates the temperature by applying a corresponding emissivity according to the type of work material entering the continuous annealing furnace to the measured temperature input from the signal conversion unit 10. And a temperature control unit 26 for controlling the combustion equipment of the annealing furnace to maintain the set temperature by comparing the temperature value of the material output from each annealing furnace applied from the temperature compensating unit 20 with a set value.

More specifically, the temperature compensator 20 includes an A / D converter 21 for converting a measurement temperature signal of the radiation thermometer input from the signal converter 10 into digital data, and a higher process management computer 30. A code receiving unit 22 for receiving a code value indicating a work material which is currently subjected to continuous annealing process, an emissivity database 23 storing emissivity for each work material measured through actual experiments, and the code receiving unit 22 The emissivity selector 24 which receives the emissivity of the work material corresponding to the received code and applies it to the correction unit 25 as a set emissivity, and the A / D according to the emissivity set by the emissivity selector 24. It consists of a correction part 25 which divides the temperature data input from the conversion part 21, and calculates the temperature of a work material.

Reference numeral 18, which is not described above, is a production management computer for creating a work schedule according to the ordered quantity, and 30 is a process management computer for receiving a work schedule from the production management computer 18 and controlling a continuous annealing process. The temperature compensation unit 20 according to the invention is to provide information about the current work material.

Such a conventional device is a method of measuring the emissivity of a material in advance for each material to build a emissivity DB for each material and correcting the emissivity for each material.

According to this method, by applying the correct emissivity for each work material it is possible to stabilize the material of the cold rolled steel sheet and to solve the temperature deviation and material deviation generation for each material.

In the continuous annealing furnace temperature control device, a description of the method of applying the emissivity for each work material is disclosed in detail in Korean Patent Laid-Open Publication No. 2003-53618.

However, the conventional method of applying the emissivity for each work material has a problem of causing a measurement error in the radiation temperature because the fluctuation of the emissivity cannot be accurately corrected when there is a variation in the emissivity between the cold rolled coil and the coil even for the same material. .

The present invention has been proposed in order to solve the above problems, and its object is to improve the measurement accuracy of the radiation thermometer by accurately correcting the radiation rate of the material of the radiation thermometer online in the cold rolling alloying process of steel mill. The present invention provides a method of compensating the radiant temperature of a radiant thermometer of a cold rolled alloying process capable of reducing the measurement error of radiant temperature of a cold rolled coil and reducing fluctuations in the radiant rate regardless of the change of steel grades for each measurement position.

In order to achieve the above object of the present invention, the radiation rate correction method of the radiation thermometer of the cold-rolled alloying process of the present invention is a plurality of cold-rolled alloying process applied to the galvanizing bath, alloying heating furnace, alloying annealing furnace and alloying cooling zone. A method of correcting the emissivity of a radiation thermometer of claim 1, wherein the emissivity of the first radiation thermometer installed on the inlet side of the galvanized metal bath is applied by applying the previously measured emissivity in the annealing process, which is a previous process, to the first correlation. 1 emissivity correction step; A second thickness provided on the inlet side of the alloying furnace by applying a plating thickness at the inlet side of the alloying furnace and an emissivity measured by a first reference radiation thermometer installed at the outlet side of the alloying furnace to a second correlation equation. A second emissivity correction step of correcting the emissivity of the thermometer; A third emissivity correction step of correcting an emissivity of a third radiation thermometer installed at an exit of the alloying annealing furnace by applying an alloying degree of a material measured after the alloying cooling zone to a predetermined third correlation equation; And a fourth emissivity correction step of correcting an emissivity of a fourth radiation thermometer installed at the exit side of the alloying cooling stand by applying the alloying degree of the material measured after the alloying cooling stand to a preset fourth correlation. It is done.

In the first emissivity correction step, the correlation between the pre-measured emissivity in the annealing process and the emissivity measured at the entrance of the zinc plating bath may be obtained for each material and set as the first correlation.

The second emissivity correction step may include: a plating thickness measured at the inlet side of the alloying furnace, an emissivity measured by a first reference radiation thermometer installed at an exit side of the alloying furnace, and an emissivity measured at the inlet side of the alloying furnace. The correlation between each other may be obtained and set as the second correlation.

In the third radiation rate correcting step, the correlation between the alloying degree of the material measured after the alloying cooling zone and the emissivity of the third radiation thermometer installed at the exit of the alloying annealing furnace is obtained and set as the third correlation equation. It is done.

In the fourth radiation rate correcting step, the correlation between the alloying degree of the material measured after the alloying cooling stand and the radiation rate of the fourth radiation thermometer installed at the exit side of the alloying cooling stand is obtained and set as the fourth correlation equation. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

2 is a block diagram of an apparatus for correcting an emissivity of a cold rolled alloying process for carrying out the present invention.

Referring to FIG. 2, an apparatus for compensating emissivity of a cold rolled alloying process for carrying out the present invention includes a plurality of radiation thermometers applied to a cold rolled alloying process including a galvanizing bath, an alloying furnace, an alloying annealing furnace, and an alloying cooling zone. A thermometer having a copy rate correction control unit 10 for controlling correction for the emissivity, and first, second, third and fourth correlation equations to be used in the radiation rate correction control unit 10 and installed in the cold rolled alloying process; I / O for inputting and outputting a corrected emissivity and measured temperature by connecting to a database 20 including the emissivity applied to each position of the respective thermometers and the emissivity correction control unit 10 with a plurality of thermometers. The O interface 30, the data I / O unit 40 for the radiation rate correction control unit 10 to transmit and receive data to and from another device, and measure the alloying degree of the material after the alloying cooling zone. Alloying degree measuring system 50 provided to the power factor correction control unit 10, and a thickness measuring device 60 for measuring the plating thickness of the material at the inlet side of the alloying heating furnace.

In addition, the radiation rate correction device, the first radiation thermometer (P11), the second radiation thermometer (installed at each predetermined position of the cold-rolled alloying process including the galvanizing bath, alloying heating furnace, alloying annealing furnace and alloying cooling zone. P12), a 1st reference radiation thermometer P20, the 3rd radiation thermometer P13, and the 4th radiation thermometer P14.

The first radiation thermometer P11 is provided at the inlet side of the zinc plating bath. The second radiation thermometer P12 is provided at the inlet side of the alloying furnace. The said 1st reference radiation thermometer P20 is provided in the exit side of the said alloying heating furnace. The third radiation thermometer P13 is provided on the exit side of the alloying annealing furnace. The fourth radiation thermometer P14 is provided on the exit side of the alloying cooling zone.

The I / O interface 30 is an input / output control system for distributing and controlling the plurality of thermometers P11 to P14 and P20 to obtain the radiation temperature and the emissivity information in real time and to transmit the emissivity correction control unit 10.

3 is a flowchart showing a method of correcting the emissivity of a radiation thermometer according to the present invention, and shows a method of correcting the emissivity of a radiation thermometer of a cold rolled alloying process according to the present invention in sequence.

4 is a view for explaining the emissivity correction process of Figure 3, Figure 4 shows a process for correcting the emissivity at each step in the emissivity correction method of the present invention.

Hereinafter, the operation and effects of the present invention will be described in detail with reference to the accompanying drawings.

The radiation rate correction method of the radiation thermometer of the cold rolling alloying process of the present invention is applied to a cold rolling alloying process including a galvanizing bath, an alloying furnace, an alloying annealing furnace, and an alloying cooling zone, and thus, the material at different positions in the cold rolling alloying process. Correct the radiation rate for multiple radiation thermometers that measure the radiation temperature of

2 to 4, first, in the first emissivity correction step (S110), a galvanized metal bath is applied by applying a previously measured emissivity in an annealing process, which is a previous process, to a first correlation set in advance. The radiation rate of the first radiation thermometer P11 provided at the entrance side of Zinc Pot) is corrected.

At this time, the first emissivity correction step (S110), the correlation between the pre-measured copy rate in the annealing process and the emissivity measured at the entrance of the zinc plating bath (Zinc Pot) for each material to obtain the first correlation Set it by an expression.

Next, in the second emissivity correction step (S120), a second correlation in which the emissivity measured by the plating thickness at the inlet side of the alloying furnace and the first reference radiation thermometer P20 provided at the outlet side of the alloying furnace is preset. The radiation rate of the second radiation thermometer P12 provided on the inlet side of the alloying furnace is corrected by applying the equation.

At this time, the second emissivity correction step (S120), the plating thickness at the inlet side of the alloying furnace, the emissivity measured by the first reference radiation thermometer (P20) installed on the exit side of the alloying furnace, and the alloying heating The correlation between the emissivity measured at the entrance of the furnace is obtained and set as the second correlation.

Here, since the first reference radiation thermometer (P20) installed on the exit side of the alloying heating furnace is a process in which the emissivity fluctuation occurs the most as the alloying process proceeds, the reference is an emissivity automatic correction type thermometer that automatically corrects the emissivity fluctuations due to alloying. Use a thermometer to measure emissivity and radiation temperature.

Next, in the third emissivity correction step (S130), by applying the alloying degree of the material measured after the alloying cooling zone to a predetermined third correlation equation of the third radiation thermometer (P13) installed on the exit side of the alloying annealing furnace Correct the emissivity.

In this case, the third emissivity correction step (S130), the correlation between the alloying degree of the material measured after the alloying cooling zone, and the emissivity of the third radiation thermometer (P13) installed at the exit of the alloying annealing furnace to obtain the correlation 3 Set the correlation.

Next, in the fourth radiation rate correcting step (S140), a fourth radiation thermometer P14 installed at the exit side of the alloying cooling zone by applying the alloying degree of the material measured after the alloying cooling zone to a preset fourth correlation equation. Correct the emissivity of

At this time, the fourth radiation rate correction step (S140), the correlation between the alloying degree of the material measured after the alloying cooling zone, and the radiation rate of the fourth radiation thermometer (P14) installed on the exit side of the alloying cooling zone to obtain the correlation between the fourth Set to correlation.

As described above, according to the present invention, each correlation is obtained for each unit material, and the correlation is stored in the database 20 for use in the emissivity correction control unit 10. Calculate the emissivity to be calibrated in real time using, and automatically calibrate the emissivity for each radiation thermometer in the cold rolled alloying process.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, but is defined by the claims, and the apparatus of the present invention may be substituted, modified, and modified in various ways without departing from the spirit of the present invention. It is apparent to those skilled in the art that modifications are possible.

According to the present invention as described above, in the method of correcting the emissivity of the radiation thermometer applied to the cold rolling alloying process of steelworks, in the cold rolling alloying process of steelworks, by accurately correcting the material emissivity of the radiation thermometer online, measurement accuracy of the radiation thermometer It is possible to improve, thereby reducing the measurement error of the radiant temperature of the cold rolled coil, regardless of the change of the steel grade, depending on the measurement position of the material, there is an effect that can reduce the radiation rate variation.

In other words, by suggesting an optimal method for on-line correction of the emissivity of materials in the alloying process, it is possible to improve the radiation temperature measurement error by minimizing the fluctuations of the emissivity between cold rolled coils and coils regardless of the change of steel type and the measurement position of materials. Can be.

Accordingly, by minimizing fluctuations in emissivity between cold rolled coils and coils, it is possible to minimize plating and alloying quality deviations between cold rolled coils and coils, and to automatically correct emissivity without installing an expensive emissivity automatic correction type radiation thermometer in the entire alloying process. By using the correlation between the mold-based radiation thermometer and the material emissivity, plating thickness and alloying degree between processes, it is possible to realize an optimal emissivity correction system economically.

Claims (5)

In the method for correcting the radiation rate of a plurality of radiation thermometer applied to the cold rolling alloying process including a galvanizing bath, alloying furnace, alloy annealing furnace and alloying cooling zone, A first emissivity correction step of correcting an emissivity of a first radiation thermometer installed at an entrance side of a galvanized gold bath by applying a previously measured emissivity in an annealing process, which is a previous process, to a preset first correlation; A second thickness provided on the inlet side of the alloying furnace by applying a plating thickness at the inlet side of the alloying furnace and an emissivity measured by a first reference radiation thermometer installed at the outlet side of the alloying furnace to a second correlation equation. A second emissivity correction step of correcting the emissivity of the thermometer; A third emissivity correction step of correcting an emissivity of a third radiation thermometer installed at an exit of the alloying annealing furnace by applying an alloying degree of a material measured after the alloying cooling zone to a predetermined third correlation equation; And A fourth emissivity correction step of correcting an emissivity of a fourth radiation thermometer installed at the exit side of the alloying cooling stand by applying the alloying degree of the material measured after the alloying cooling stand to a preset fourth correlation. Emissivity correction method of the radiation thermometer of the cold rolled alloying process comprising a. The method of claim 1, wherein the first radiation rate correction step, Correlation between the pre-measured emissivity in the annealing process and the emissivity measured at the entrance of the galvanizing bath is obtained for each material and set as the first correlation. . The method of claim 1, wherein the second radiation rate correction step, The correlation between the plating thickness at the inlet side of the alloying furnace, the emissivity measured by a first reference radiation thermometer provided at the exit side of the alloying furnace, and the emissivity measured at the inlet side of the alloying furnace is obtained, and the second is obtained. Emissivity correction method of the radiation thermometer of the cold-rolled alloying process, characterized in that the correlation set. The method of claim 1, wherein the third radiation rate correction step, The radiation thermometer of the cold rolling alloying process characterized in that the correlation between the alloying degree of the material measured after the alloying cooling zone and the emissivity of the third radiation thermometer installed on the exit side of the alloying annealing furnace is obtained and set as the third correlation equation. How to correct the emissivity of The method of claim 1, wherein the fourth radiation rate correction step, The correlation between the alloying degree of the material measured after the alloying cooling zone and the radiation rate of the fourth radiation thermometer installed at the exit side of the alloying cooling zone is obtained and set as the fourth correlation equation. Emissivity correction method.

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