KR101714928B1 - Apparatus and method for measuring thickness of refractory in blast furnace hearth - Google Patents

Apparatus and method for measuring thickness of refractory in blast furnace hearth Download PDF

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KR101714928B1
KR101714928B1 KR1020150184271A KR20150184271A KR101714928B1 KR 101714928 B1 KR101714928 B1 KR 101714928B1 KR 1020150184271 A KR1020150184271 A KR 1020150184271A KR 20150184271 A KR20150184271 A KR 20150184271A KR 101714928 B1 KR101714928 B1 KR 101714928B1
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South Korea
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ultrasonic
thickness
blast furnace
reception
sensor unit
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KR1020150184271A
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Korean (ko)
Inventor
신남호
최상우
최태화
류창우
최세호
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주식회사 포스코
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/02—Internal forms
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/04—Blast furnaces with special refractories
    • C21B7/06—Linings for furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0021—Devices for monitoring linings for wear
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/102—Number of transducers one emitter, one receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/103—Number of transducers one emitter, two or more receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/105—Number of transducers two or more emitters, two or more receivers

Abstract

According to an embodiment of the present invention, there is provided an apparatus for measuring a thickness and thickness of a bladder, comprising: an ultrasonic transmission / reception controller for controlling transmission and reception of ultrasonic signals; An ultrasonic transmission sensor unit for transmitting an ultrasonic signal under the control of the ultrasonic transmission / reception control unit; An ultrasonic reception sensor unit receiving ultrasonic signals reflected from the inside of the blast furnace after being transmitted from the ultrasonic transmission sensor unit at different detection positions and providing the ultrasonic signals to the ultrasonic transmission / reception control unit; A signal analyzer for measuring a thickness and a thickness of the furnace bottom in the furnace based on ultrasonic signals received at different detection positions by the ultrasonic transmission sensor unit; . ≪ / RTI >

Description

[0001] APPARATUS AND METHOD FOR MEASURING THICKNESS OF REFRACTORY IN BLAST FURNACE HEARTH [0002]

The present invention relates to an apparatus and a method for measuring a thickness and a stiffness of a blast furnace at a bottom of a blast furnace using an ultrasonic sensor.

In general, the furnace bottom portion functions as a container for storing high-temperature molten iron and slag at a temperature of 1,560 ° C or higher, which is reduced at the top. At this time, due to the long-term operation of the blast furnace, the runoff from the runoff is continuously eroded. If the erosion progresses below a certain level, the charred runoff will be discharged from the blast furnace due to cracks in the runoff. Number shall be carried out.

Therefore, the measurement of the residual stiffness and thickness of the bottom of the blast furnace is an important factor in determining the life of the blast furnace. Iron pipes and stoves on the upper part of the blast furnace can be replaced with purified water, but the furnace part containing the charcoal can not be replaced or repaired before the repair.

It is also important to determine the exit position of the furnace bottom when the charcoal contained in the furnace bottom is taken out at the time of making the number. It is economical to determine the location of the furnace bottom and the thickness of the furnace bottom.

As an example, there is a conventional method of measuring the thickness of the lower part of a blast furnace, and estimating the remaining stiffness and thickness of the furnace section by using information of thermocouples installed in various places.

However, this is not a simple estimate, and there is a disadvantage that many errors occur depending on the installation position of the thermocouple.

In recent years, there has been a method of measuring the thickness and the thickness by frequency extraction using the longitudinal resonance characteristic occurring between the impact surface and the inner surface of the inner conductor by applying an impact from the outside.

However, there is a problem that a large difference in reflection characteristics occurs due to the development of the contact portion with the charcoal, resulting in a large error.

In addition, there is a case where a thickness measurement method using the velocity of the ultrasonic wave is used. When the ultrasonic wave is transmitted at one point and the ultrasonic wave is transmitted / received at a single point, the abrasion states of the contact surfaces with the molten iron are different or uneven There is a problem that it is difficult to accurately measure the position to be measured.

The following prior art documents do not disclose a solution to the above-mentioned conventional technical problem.

US Patent Publication No. 2004-0177692 United States Patent Publication No. 2008-0092658

An embodiment of the present invention provides an apparatus and method for measuring a thickness and a thickness of a blast furnace which can more accurately measure the remaining stiffness and thickness of a blast furnace bottom portion by reducing the measurement error using an ultrasonic sensor.

According to an embodiment of the present invention, an ultrasonic transmission / reception control unit for controlling transmission and reception of ultrasonic signals; An ultrasonic transmission sensor unit for transmitting an ultrasonic signal under the control of the ultrasonic transmission / reception control unit; An ultrasonic reception sensor unit receiving ultrasonic signals reflected from the inside of the blast furnace after being transmitted from the ultrasonic transmission sensor unit at different detection positions and providing the ultrasonic signals to the ultrasonic transmission / reception control unit; A signal analyzer for measuring a thickness and a thickness of the furnace bottom in the furnace based on ultrasonic signals received at different detection positions by the ultrasonic transmission sensor unit; And a thickness measuring device is proposed.

In the solution of this task, one of several concepts described in the following detailed description is provided. The subject matter of the present invention is not intended to identify the core or essential technology of the claimed subject matter, but merely one of the claimed subject matter is described, each of which is specifically set forth in the following detailed description.

According to an embodiment of the present invention, when at least one ultrasonic transmission sensor and at least two ultrasonic reception sensors are used and ultrasonic signals received through at least two ultrasonic reception sensors are used, Can be measured.

As a result, it is possible to utilize it as an important factor in the determination of the number of blast furnaces, to appropriately select the exit position of the furnace at the time of repair, and to stably manage the blast furnace bottom portion by securing periodic measurement data And it has an effect of prolonging the life of the blast furnace.

In addition, when measuring the thickness of a softened (or refractory) material, the reflection characteristics of the ultrasonic wave are changed according to the state of the surface of the tangent and the surface in contact with the molten iron, thereby reducing the measurement error that may be caused.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a device for measuring a thickness of a blast furnace according to an embodiment of the present invention. FIG.
FIG. 2 is a diagram illustrating an ultrasonic wave arrival velocity measurement at the time of ultrasonic transmission / reception according to an embodiment of the present invention.
Figs. 3 (a) to 3 (d) are diagrams showing examples of measurement of the stiffness and thickness of the furnace bottom according to the shape of the inner surface of the blast furnace.
4 (a) to 4 (c) are diagrams illustrating the measurement of the thickness and the thickness of an oven using an ultrasonic receiving sensor in the form of an array of internal surfaces of a blast furnace.
Fig. 5 is a diagram showing an example of the shape of a section of a trough of an oven. Fig.
6 (a) to 6 (d) are views illustrating an arrangement of an ultrasonic transmission sensor and an ultrasonic receiving sensor according to an embodiment of the present invention.
FIG. 7 is a flow chart illustrating a method of measuring a thickness of a blast furnace according to an exemplary embodiment of the present invention. Referring to FIG.
FIG. 8 is a flowchart illustrating a process of calculating a thickness of a softened portion according to an exemplary embodiment of the present invention. Referring to FIG.
9 is a graph showing the directivity characteristics of an ultrasonic signal according to a directing angle and a wavelength.
10 is a first exemplary view for measuring the arrival velocity of an ultrasonic signal at an arbitrary position.
11 is a second exemplary view for measuring the arrival velocity of an ultrasonic signal at an arbitrary position.
12 is an illustration of measured values of the softening thickness in an arbitrary arrangement according to an embodiment of the present invention.

It should be understood that the present invention is not limited to the embodiments described and that various changes may be made without departing from the spirit and scope of the present invention.

In addition, in each embodiment of the present invention, the structure, shape, and numerical values described as an example are merely examples for helping understanding of the technical matters of the present invention, so that the spirit and scope of the present invention are not limited thereto. It should be understood that various changes may be made without departing from the spirit of the invention. The embodiments of the present invention may be combined with one another to form various new embodiments.

In the drawings referred to in the present invention, components having substantially the same configuration and function as those of the present invention will be denoted by the same reference numerals.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a device for measuring a thickness of a blast furnace according to an embodiment of the present invention. FIG.

Referring to FIG. 1, the apparatus for measuring the thickness of a bladder according to an exemplary embodiment of the present invention includes an ultrasonic transmission / reception control unit 100, an ultrasonic transmission sensor unit 200, an ultrasonic reception sensor unit 300, and a signal analyzer 400 Include.

2 is a side view showing the structure from the outer side of the blast furnace to the inner side of the blast furnace, and the right side of FIG. 2 is a side view of the structure of the ultrasonic transmission sensor unit 200 and the ultrasonic reception sensor unit 300 And each sensor is disposed on the outer side of the blast furnace.

The ultrasonic transmission / reception control unit 100 may control transmission and reception of ultrasonic signals to the ultrasonic transmission sensor unit 200 and the ultrasonic reception sensor unit 300. [

For example, the ultrasonic transmission / reception control unit 100 may control transmission of ultrasonic signals to the ultrasonic transmission sensor unit 200 and receive ultrasonic signals from the ultrasonic reception sensor unit 300.

The ultrasonic transmission sensor included in the ultrasonic transmission sensor unit 200 and the ultrasonic sensor included in the ultrasonic reception sensor unit 300 may be used to measure the thickness and the thickness of the blast furnace using the high porosity and thickness measuring apparatus according to an embodiment of the present invention. A plurality of included ultrasonic receiving sensors are installed in the outer foil of the blast furnace.

The ultrasonic transmission sensor unit 200 may include at least one ultrasonic transmission sensor and may transmit an ultrasonic signal under the control of the ultrasonic transmission / reception control unit 100.

The ultrasonic transmission sensor unit 200 may include one ultrasonic transmission sensor S-SEN1 and may include a plurality of ultrasonic transmission sensors.

For example, when the ultrasonic transmission sensor unit 200 includes one ultrasonic transmission sensor S-SEN1, the ultrasonic transmission sensor S-SEN1 may be disposed at the back of the blast furnace 10, Here, the impact position for applying an impact with the ultrasonic signal can be changed several times for a plurality of times of measurement.

The ultrasonic receiving sensor unit 300 includes at least two ultrasonic receiving sensors and is configured to detect ultrasonic waves reflected or scattered in the blast furnace 10 after being transmitted from the ultrasonic transmission sensor unit 200 Signals can be received at different detection positions and provided to the ultrasonic transmission / reception control unit 100.

The ultrasonic receiving sensor unit 300 may include a plurality of ultrasonic receiving sensors for receiving ultrasonic signals reflected in the blast furnace 10 at a plurality of different positions of the blast furnace 10.

For example, the ultrasonic receiving sensor unit 300 may include three first, second, and third ultrasonic receiving sensors R-SEN1, R-SEN2, and R-SEN3. Here, the first, second and third ultrasonic receiving sensors R-SEN1, R-SEN2 and R-SEN3 are connected to each other at every impact on the impact position in the ultrasonic transmission sensor S- It is possible to receive an ultrasonic wave signal reflected from the inside of the antenna.

In one embodiment of the present invention, when the ultrasonic receiving sensor unit 300 includes three first, second and third ultrasonic receiving sensors R-SEN1, R-SEN2 and R-SEN3 For example, but are not limited thereto.

Also, in one embodiment of the present invention, the ultrasonic transmission sensor unit 200 may include a plurality of ultrasonic transmission sensors, and the ultrasonic reception sensor unit 300 may include a plurality of ultrasonic reception sensors, In this case, they may be arranged in various arrangements as shown in FIG. 6, and are not limited to the arrangements shown in FIG.

As described above, the high-porosity and thickness measuring apparatus according to one embodiment of the present invention includes an ultrasonic transmission sensor unit 200 including at least one ultrasonic transmission sensor, an ultrasonic reception sensor unit including at least two ultrasonic reception sensors 300, an ultrasonic transmission / reception control unit 100, and a signal analyzer 400.

For example, when using the bladder and thickness measuring device according to an embodiment of the present invention, a plurality of ultrasonic receiving sensors made of arrays are installed in the blast furnace bottom part to be measured, and while moving the position of the ultrasonic transmitting sensors, By measuring the remaining stiffness and thickness of the bottom portion, it is possible to obtain the trajectory information about the thickness and thickness of the blast furnace bottom portion.

The signal analyzer 400 can measure the thickness and thickness of the furnace bottom of the blast furnace 10 based on the ultrasonic signals received at the different detection positions by the ultrasonic wave receiving sensor unit 300.

In order to reduce the influence of iron on the blast furnace, a high softening thickness measuring apparatus according to an embodiment of the present invention includes a band-pass filter (not shown) for removing frequency components reflected from the iron foil, As shown in FIG. As described above, by using the bandpass filter, it is possible to remove the frequency component reflected from the woven fabric, so that more accurate measurement can be performed.

FIG. 2 is a diagram illustrating an ultrasonic wave arrival velocity measurement at the time of ultrasonic transmission / reception according to an embodiment of the present invention.

Referring to FIG. 2, the signal analyzer 400 can calculate the arrival time T of the ultrasonic signal by using the transmission time of the ultrasonic signal and the reception time of the ultrasonic signal, based on the at least two ultrasonic signals .

Figs. 3 (a) to 3 (d) are diagrams showing examples of measurement of the stiffness and thickness of the furnace bottom according to the shape of the inner surface of the blast furnace.

Fig. 3 (a) is a diagram showing an example of measurement of the stiffness and thickness of the furnace section when the inner surface of the furnace is flat (ideal case). Fig.

3 (a) is a diagram showing a measurement example of the remaining stiffness and thickness when abrasion with the stiffness of the furnace portion proceeds vertically and is flat (ideal case). The residual stiffness and thickness are the same as those of the ultrasonic signal shown in Fig. 2 Using the arrival time (T) and the velocity of the ultrasonic signal, the residual stiffness and thickness can be obtained as shown in the following equation (1)

Figure 112015126052297-pat00001

Here, the velocity of the ultrasonic signal with the lead may be a known value measured in advance.

Fig. 3 (b) is an example of measurement of the residual stiffness and thickness of the furnace bottom when the inner surface of the furnace is bent (in the actual case).

3 (a) and 3 (b), the actual position to be measured is the f point of the red line. When the wall inside the furnace is not a straight line but a curved portion, Can be measured.

FIG. 3C is an exemplary view showing a margin of the open end and a residual thickness measurement error in the case where the cross-section of the inner surface of the blast furnace is convex. Fig. 3D is an exemplary view showing a measurement error of the edge and remaining thickness of the furnace portion when the cross-section of the inner surface of the blast furnace is concave.

C and D in Fig. 3 show examples of measurement errors with respect to the residual stiffness and thickness for the case where the cross-section of the blast-furnace inner surface is convex or concave.

4 (a) to 4 (c) are diagrams illustrating the measurement of the thickness and the thickness of an oven using an ultrasonic receiving sensor in the form of an array of internal surfaces of a blast furnace.

Fig. 4 (a) is an example of measurement of the stiffness and thickness of the furnace portion in the case where only the end of the blast furnace inner surface is flushed and the ultrasonic receiving sensor is in the form of an array, and Fig. 4 (b) FIG. 4C is a view showing a case where the cross-section of the inner surface of the blast furnace is concave and the ultrasonic receiving sensor is in the form of an array. FIG. Fig. 4 is a measurement chart for the thickness and thickness of the openings for the case of Fig.

4 (a) to 4 (c) also show measurement examples for improving the above-described measurement error in the residual pendulum and thickness measuring apparatus according to the embodiment of the present invention.

Referring to FIG. 4A, the ultrasonic transmission sensor unit 200 can transmit an ultrasonic signal while moving to an arbitrary position using one ultrasonic transmission sensor S-SEN1. The ultrasonic receiving sensor unit 300 may arrange a plurality of ultrasonic receiving sensors R-SEN1, SEN2, and SEN3 in an array to receive ultrasonic signals at a plurality of different positions. The plurality of ultrasonic receiving sensors R -SEN1, SEN2, SEN3), it is possible to reduce the error.

For example, when an ultrasonic signal is transmitted from the first transmission point IMP1 by the ultrasonic transmission sensor S-SEN1 shown in FIG. 4A, a plurality of ultrasonic reception sensors R-SEN1 to R-SEN3 SEN1 to R-SEN3) can receive ultrasound signals and then transmit ultrasound signals at a second transmission point (IMP2) by the ultrasound transmission sensor (S-SEN1) Can receive ultrasonic signals. The ultrasound signals can be transmitted from the third transmission point IMP3 by the ultrasonic transmission sensor S-SEN1 and the ultrasonic reception sensors R-SEN1 to R-SEN3 can receive the ultrasonic signals.

Since the ultrasound signals transmitted at different positions are received using the plurality of ultrasound reception sensors, the signal analyzer 400 can more accurately measure the softening thickness at different positions, and a detailed description thereof will be described later .

Fig. 5 is a diagram showing an example of the shape of a section of a trough of an oven. Fig.

Fig. 5 shows an example of the cross-sectional shape of the finally calculated calcination furnace bottom section.

Referring to FIG. 5 (a), when receiving with a general ultrasonic wave, time information of the horizontal axis is displayed with respect to the distance of the vertical axis like B-scan. Here, B-scan is one of the data representation methods representing the cross-sectional area of the test object. It uses a probe scanned in only one direction to measure the beam path for echoes having a predetermined amplitude range corresponding to the position of the beam axis To show the cross section of the specimen formed. This can generally be used to indicate the depth and length of the reflector.

However, the information by this method does not coincide with the structure in the medium. Reflected / scattered sound waves at the boundary within the medium are spread widely and appear in a larger area than in reality.

Referring to FIG. 5B, when the SAFT technique is applied, ultrasound signals at positions corresponding to actual boundaries are reinforced by overlapping, and other signal components are not in phase with each other It has the advantage of showing a shape similar to the real because it is canceled out. Here, SAFT is one of the image processing methods for reconstructing a signal by matching the propagation time of the received signal to accurately represent the cross-sectional structure.

Accordingly, the SAFT technique can be applied to measure the thickness of the stitches according to an embodiment of the present invention.

6 (a) to 6 (d) are views illustrating an arrangement of an ultrasonic transmission sensor and an ultrasonic receiving sensor according to an embodiment of the present invention.

6 (a) is a first exemplary layout of an ultrasonic transmission sensor and an ultrasonic receiving sensor according to an embodiment of the present invention.

6 (a), the ultrasonic transmission sensor unit 200 may include a plurality of ultrasonic reception sensors having, for example, Rn array structures, and the ultrasonic reception sensor unit 300 may include For example, a plurality of ultrasonic transmission sensors in which Sn pieces are arranged in an array.

6 (b) is a diagram illustrating a second arrangement of the ultrasonic transmission sensor and the ultrasonic receiving sensor according to an embodiment of the present invention.

Referring to FIG. 6B, the ultrasonic transmission sensor unit 200 may include a plurality of ultrasonic reception sensors having 2 arrays of 2 X Rn, for example, and the ultrasonic reception sensor unit 300 may include, For example, a plurality of ultrasonic transmission sensors in which Sn pieces are arranged in an array.

6 (b) is an example of a structure in which an ultrasonic transmission sensor is disposed between a pair of ultrasonic reception sensors.

6 (c) is a diagram illustrating a third arrangement example of the ultrasonic transmission sensor and the ultrasonic receiving sensor according to the embodiment of the present invention.

6 (c), the ultrasonic transmission sensor unit 200 may include a plurality of ultrasonic reception sensors having, for example, Rn array structures, and the ultrasonic reception sensor unit 300 may include For example, a plurality of ultrasonic transmission sensors each having 2X Sn pairs arranged in two arrays.

That is, FIG. 6C is an example of a structure in which an ultrasonic receiving sensor is disposed between a pair of ultrasonic transmitting sensors.

FIG. 6 (d) is a fourth exemplary layout of an ultrasonic transmission sensor and an ultrasonic receiving sensor according to an embodiment of the present invention.

Referring to FIG. 6D, the ultrasonic transmission sensor unit 200 may include a plurality of ultrasonic reception sensors, for example, Rn numbered arrayed in a row, and the ultrasonic reception sensor unit 300 may include, For example, the ultrasonic transmission sensor may include a plurality of ultrasonic transmission sensors in which Sn chips are arranged in a row.

That is, FIG. 6 (d) is an example of a structure in which the ultrasonic receiving sensor and the ultrasonic transmitting sensor are arranged in a single arrangement structure and are arranged at an intersection with each other.

FIG. 7 is a flow chart illustrating a method of measuring a thickness of a blast furnace according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIGS. 1 to 7, at least one ultrasonic transmission sensor unit 200 may transmit ultrasonic signals under the control of the ultrasonic transmission / reception control unit 100 in step S100.

In step S200, after the ultrasonic wave receiving sensor unit 300 including at least two ultrasonic wave receiving sensors is transmitted from the ultrasonic wave transmitting sensor 210, ultrasonic waves reflected inside the blast furnace 10 at different positions are received .

At this time, the ultrasonic receiving sensor unit 300 can receive ultrasonic signals reflected in the blast furnace 10 at different positions of the blast furnace 10.

In step S300, the signal analyzer 400 analyzes the ultrasonic signals received from the ultrasonic receiving sensor unit 300 including the at least two ultrasonic receiving sensors, The thickness and the thickness of the sheet can be measured.

At this time, the signal analyzer 400 calculates the arrival speed of each ultrasonic signal on the basis of the at least two ultrasonic signals, and calculates the thickness (W i, i ) of the oven bottom portion of the blast furnace 10 Can be measured.

FIG. 8 is a flowchart illustrating a process of calculating a thickness of a softened portion according to an exemplary embodiment of the present invention. Referring to FIG.

1 to 8, an exaggeration for measuring the length and thickness (W i, j ) of the furnace bottom of the blast furnace 10 will be described.

First, in step S310, based on at least two ultrasound signals received by the ultrasound reception sensor unit 300 including the at least two ultrasound reception sensors, the ultrasound signals transmitted from the ultrasound transmission sensor unit 200, (s, r, i, j) of the ultrasonic signal received by the ultrasonic receiving sensor unit 300 including the at least two ultrasonic receiving sensors, )) Can be calculated.

This will be described with reference to the following equations (2), (3) and (4).

Next, in step S320, the transmission point of the ultrasonic transmission sensor unit 200 and the reflection point x (i), y (j) are calculated using the flight time ToF (s, ), we can calculate the first directivity characteristic value (a s (θ s (s , i, j)) between). This will be described with reference to Equation (6) below.

Next, in step S330, the reception point of the ultrasonic reception sensor unit 300 and the reflection point x (i), y (j) are calculated using the flight time ToF (s, ), you can calculate the second directivity characteristic value (a r (θ r (s , i, j)) between). This is explained with reference to Equation (7) below.

And, S340 In the step, the first directivity characteristic value (A s (θ s (s , i, j))), the second directivity characteristic value (A r (θ s (s , i, j))) and receive the you can calculate the ultrasonic signal (W s, r (ToF (s, r, i, j))), the blast furnace 10, the furnace bottom kite thickness (W i, j) of using a.

This will be described with reference to the following equation (8).

FIG. 9 is a graph showing the directivity characteristics of an ultrasonic signal according to a directing angle and a wavelength, and FIG. 10 is a first example of a measurement of arrival velocity of an ultrasonic signal at an arbitrary position. 11 is a second exemplary view for measuring the arrival velocity of an ultrasonic signal at an arbitrary position.

9 and 10, when the ultrasonic transmission sensor (Source) is in the range of 1 to Sn and the ultrasonic reception sensor is in the range of 1 to Rn, the ultrasonic transmission sensors The ultrasonic receiving sensor can receive the signals simultaneously from 1 to Rn when the sound waves are sequentially transmitted with sufficient time margin.

At this time, a first flight time (ToF s ) from an s-th ultrasonic transmission sensor to an arbitrary reflection position x (i), y (j) is expressed by the following equation (2).

Figure 112015126052297-pat00002

Where x (i) and y (j) mean arbitrary reflection positions (i, j) for the transverse (x) and longitudinal (y) axes, xs (s) denotes the position of the s-th ultrasonic transmission sensor, and C denotes the sound velocity.

The second flight time (FoT r ) from the arbitrary reflection position (x (i), y (j)) to the rth ultrasonic receiving sensor is expressed by the following equation (3).

Figure 112015126052297-pat00003

X (i) and y (j) are arbitrary reflection positions (i, j) with respect to the transverse (x) and longitudinal (y) axes, and xr r) denotes the position of the r-th ultrasonic receiving sensor, and C denotes the sound velocity.

An ultrasound signal generated from an s-th ultrasonic transmission sensor and reflected / scattered at an arbitrary reflection position x (i), y (j) to be received by an rth ultrasonic reception sensor The time of flight (FoT (r, r, i, j)) is shown in Equation (4).

Figure 112015126052297-pat00004

Referring to FIG. 9, in the case of an ultrasonic transmission sensor (Impact source) that emits an ultrasonic signal among structural characteristics of an ultrasonic transmission sensor, that is, an ultrasonic transmission signal, the shape of a structure tip of the ultrasonic transmission sensor , The contact surface size of the ultrasonic receiving sensor, and the element size of the ultrasonic receiving sensor.

For example, since the amplitude of an ultrasound reception signal varies with respect to an equivalent sound wave depending on a directional characteristic such as a directivity angle, the SAFT technique may be applied to an ultrasonic transmission sensor and an ultrasonic reception sensor, Characteristics should be reflected.

In Equation (5), the value a may be determined according to the structural characteristics of each ultrasonic transmission sensor and an ultrasonic reception sensor.

Figure 112015126052297-pat00005

Here, θ denotes a directional angle at which ultrasonic signals are transmitted and received by the ultrasonic transmission sensor or the ultrasonic reception sensor, and a denotes a directional angle at which the ultrasonic signal is transmitted, Is a representative value of the diameter, [pi] is the circularity, and [lambda] is the wavelength of the ultrasonic signal

10 shows the orientation of the ultrasonic transmission signal, wherein the first directivity characteristic value A s for an arbitrary reflection position (x (i), y (j)) from the s-th ultrasonic transmission sensor (Source) 6 can be obtained by the same procedure.

Figure 112015126052297-pat00006

Here,? S is a directional angle at which an ultrasonic wave signal is modulated on the basis of the texture of the blast furnace at the impact position of the ultrasonic transmission sensor, and as is determined according to the structural characteristic of each ultrasonic transmission sensor Is a representative value of the diameter of the device,

11 shows the azimuth angle of the ultrasonic reception signal. The second directional characteristic value A r for an arbitrary reflection position (x (i), y (j)) from the rth ultrasonic receiving sensor is expressed by the following mathematical expression Can be obtained by the procedure of Equation (7).

Figure 112015126052297-pat00007

Here, θr is a directional angle at which the ultrasonic wave signal is modulated with the acoustic wave at the receiving position of the ultrasonic receiving sensor, and ar is determined according to the structural characteristic of each ultrasonic receiving sensor Is a representative value of the diameter of the device.

12 is an illustration of measured values of the softening thickness in an arbitrary arrangement according to an embodiment of the present invention.

12 shows the sound field distribution in the medium. It is composed of a horizontal axis on which the transmission / reception sensor is located and a vertical direction vertical axis. It divides the medium into the separated regions of the N M array and superimposes the amplitudes corresponding to the respective points to represent the boundaries in the medium, thereby visualizing the crack and thickness boundary surfaces.

For example, when the ultrasonic signal generated from the s-th ultrasonic transmission sensor and received by the r-th ultrasonic reception sensor is Ws, r, the reflected / scattered signal at an arbitrary position (i, j) the ultrasonic signal generated from each of the ultrasonic transmission sensors from 1 to Sn may correspond to 1 to Rn (ToF (s, r, i, j) The superimposed result of the ultrasonic signal received from the ultrasonic receiving sensor can be expressed as Wi, j at each position in the NM coordinate space as shown in Equation (8).

Figure 112015126052297-pat00008

According to the embodiment of the present invention as described above, an ultrasonic reception in an array structure is performed while changing transmission positions of ultrasonic signals, and an average of the signals is taken to reduce errors.

In addition, it is possible to more accurately measure the remaining thickness of the flame (or refractory) of the blast furnace bottom portion by reducing the influence of the ultrasonic reflection component depending on the shape of the portion contacting the hot wire.

100: Ultrasonic transmission /
200: Ultrasonic transmission sensor unit
300: ultrasonic receiving sensor unit
400: Signal Analyzer

Claims (9)

An ultrasonic transmission / reception control unit for controlling transmission and reception of ultrasonic signals;
An ultrasonic transmission sensor unit which is disposed on the outer side of the blast furnace and transmits an ultrasonic signal to the inside of the blast furnace based on the control of the ultrasonic transmission / reception control unit;
An ultrasonic reception sensor unit disposed at an outer side of the blast furnace and receiving ultrasonic signals reflected from the inside of the blast furnace after being transmitted from the ultrasonic transmission sensor unit at different detection positions and providing the received ultrasonic signals to the ultrasonic transmission / reception control unit;
A signal analyzer for measuring a thickness and a thickness of the furnace bottom in the furnace based on ultrasonic signals received at different detection positions by the ultrasonic transmission sensor unit; Lt; / RTI >
The signal analyzer
Calculating a flight time of the at least two ultrasonic signals transmitted from the ultrasonic transmission sensor unit and reflected at a reflection point based on the at least two ultrasonic signals received at the different detection positions, Calculating a first directional characteristic value between the transmission point of the ultrasonic signal and the reflection point and calculating a second directional characteristic value between the reception point of the ultrasonic reception and the reflection point using the flight time, A first direction characteristic value, a second direction characteristic value, and the received ultrasonic signal to calculate a thickness and a thickness of the bladder of the blast furnace.
The ultrasonic diagnostic apparatus according to claim 1,
And a plurality of ultrasonic receiving sensors disposed at different positions to receive ultrasonic signals reflected inside the blast furnace.
The apparatus of claim 1, wherein the ultrasonic transmission sensor unit
And at least one ultrasonic transmission sensor.
The ultrasonic diagnostic apparatus according to claim 1,
And at least two first and second ultrasonic receiving sensors spaced apart from each other,
Wherein each of the at least two first and second ultrasound receiving sensors comprises:
And receives different ultrasonic signals reflected inside the blast furnace.
The apparatus of claim 1, wherein the signal analyzer comprises:
And calculates the arrival speed of each ultrasonic signal on the basis of the at least two ultrasonic signals and measures a thickness and a thickness of the furnace bottom portion on the basis of the calculated arrival speed.
A method for measuring a remaining stiffness and thickness of a bottom of a blast furnace using an ultrasonic transmission sensor unit and an ultrasonic reception sensor unit,
At least one ultrasonic transmission sensor disposed at the outer side of the blast furnace to transmit ultrasonic signals into the blast furnace;
Receiving ultrasound signals reflected from the inside of the blast furnace at different positions after the ultrasonic wave receiving sensor unit including at least two ultrasonic receiving sensors disposed on the outer side of the blast furnace is transmitted from the ultrasonic transmission sensor; And
Measuring a thickness and a thickness of the bladder of the blast furnace based on at least two ultrasonic signals received by the signal analyzer by the at least two ultrasonic receiving sensors; Lt; / RTI >
The step of measuring the thickness and the thickness of the furnace bottom of the blast-
And a control unit configured to control an operation of the at least two ultrasonic sensors based on at least two ultrasonic signals received by the at least two ultrasonic reception sensors, A first step of calculating;
A second step of calculating a first directional characteristic value between the transmission point of the ultrasonic transmission sensor and the reflection point using the flight time;
A third step of calculating a second directional characteristic value between the reception point of the ultrasonic reception sensor and the reflection point using the flight time; And
A fourth step of calculating an edge and a thickness of the bladder by using the first directional characteristic value, the second directional characteristic value, and the received ultrasonic signal;
And a thickness measurement method.
7. The method of claim 6, wherein the step of receiving the ultrasound signal comprises:
Wherein the ultrasonic receiving sensor unit includes a plurality of ultrasonic receiving sensors disposed at different positions to receive an ultrasonic signal reflected in the inside of the blast furnace.
7. The method as claimed in claim 6, wherein the measuring of the thickness and the thickness of the furnace bottom portion of the blast furnace comprises:
Wherein the signal analyzer calculates an arrival speed of each ultrasonic signal based on the at least two ultrasonic signals and measures a thickness and a thickness of the bottom of the blast furnace based on the calculated arrival speed.
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KR1020150184271A 2015-12-22 2015-12-22 Apparatus and method for measuring thickness of refractory in blast furnace hearth KR101714928B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110527769A (en) * 2018-07-18 2019-12-03 广东韶钢松山股份有限公司 A kind of residual thick judgment method of blast furnace crucibe carbon brick

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040177692A1 (en) 2003-03-13 2004-09-16 Andec Manufacturing Ltd. System and method for inspecting an industrial furnace or the like
JP2005010139A (en) * 2003-05-29 2005-01-13 Jfe Steel Kk Residual thickness measuring method and device for furnace refractory using elastic wave
US20080092658A1 (en) 2005-02-22 2008-04-24 Hatch Ltd. Systems, methods and apparatus for non-disruptive and non-destructive inspection of metallurgical furnaces and similar vessels

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040177692A1 (en) 2003-03-13 2004-09-16 Andec Manufacturing Ltd. System and method for inspecting an industrial furnace or the like
JP2005010139A (en) * 2003-05-29 2005-01-13 Jfe Steel Kk Residual thickness measuring method and device for furnace refractory using elastic wave
US20080092658A1 (en) 2005-02-22 2008-04-24 Hatch Ltd. Systems, methods and apparatus for non-disruptive and non-destructive inspection of metallurgical furnaces and similar vessels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110527769A (en) * 2018-07-18 2019-12-03 广东韶钢松山股份有限公司 A kind of residual thick judgment method of blast furnace crucibe carbon brick
CN110527769B (en) * 2018-07-18 2021-04-30 广东韶钢松山股份有限公司 Method for judging residual thickness of carbon brick in blast furnace hearth

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