KR101577809B1 - Combination probe capable of measuring thickness of slag in metal melts - Google Patents

Combination probe capable of measuring thickness of slag in metal melts Download PDF

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KR101577809B1
KR101577809B1 KR1020140106737A KR20140106737A KR101577809B1 KR 101577809 B1 KR101577809 B1 KR 101577809B1 KR 1020140106737 A KR1020140106737 A KR 1020140106737A KR 20140106737 A KR20140106737 A KR 20140106737A KR 101577809 B1 KR101577809 B1 KR 101577809B1
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slag
sensor
pair
inductor
unit
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KR1020140106737A
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Korean (ko)
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정의성
이만업
김효상
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우진 일렉트로나이트㈜
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/10—Thermometers specially adapted for specific purposes for measuring temperature within piled or stacked materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N1/12—Dippers; Dredgers
    • G01N1/125—Dippers; Dredgers adapted for sampling molten metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Hydrology & Water Resources (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

Disclosed is a combination probe capable of measuring a thickness of a slag in molten metal. The combination probe according to the present invention comprises: a sensor unit having a temperature sensor to detect a temperature of molten metal; a sensor head unit wherein an upper portion of the sensor unit is exposed, and a lower portion of the sensor unit is fixed therein; a protective cap to protect the upper portion of the sensor unit; a pair of first compensation wires electrically connected to the temperature sensor of the sensor unit; a first connector contact to electrically connect the first compensation wires to an external device; a slag thickness measurement unit disposed on the sensor head unit to measure a thickness of a slag in the molten metal; and a protective pipe to protect the sensor head unit, the pair of first compensation wires, and the slag thickness measurement unit. The slag thickness measurement unit comprises: an inductor disposed in the sensor head unit; an electronic board disposed on a lower portion of the inductor and electrically connected to the inductor; a pair of second compensation wires electrically connected to the electronic board; a second connector contact to connect the second compensation wires to an external device; and a slag contact unit coming into contact with an upper end of the slag to detect a position of the slag.

Description

TECHNICAL FIELD [0001] The present invention relates to a composite probe capable of measuring the slag thickness in a molten metal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe for measuring a molten metal, and more particularly, to a composite probe capable of measuring temperature and composition of molten metal as well as slag thickness in molten metal.

Generally, when the temperature and probe probes and the sample collecting probes are respectively operated, the efficiency of labor due to the repeated measurement of the probe is lowered as well as the cost increase factor, resulting in a problem of lowering the productivity. In order to solve this problem, in addition to the temperature measurement and the measurement function, an integral type composite probe capable of simultaneously collecting samples requiring extreme control of components by preventing contamination of the sample is being used in the field.

However, the information obtained by the composite probe is information on molten steel, and information on the molten steel upper slag layer can not be obtained.

On the other hand, slag exists in the upper part of the molten steel in the case of a steel making plant such as a ladle. The slag is made of metal or non-metal oxide generated during the manufacture of molten steel in the converter, and serves as a mediator to stably remove the impurities contained in the steel. For this purpose, it is possible to facilitate the manufacture of molten steel by injecting raw materials such as quicklime and dolomite into the furnace during the transferring operation to collect oxides generated during the blowing. The slag also acts as an insulating material to prevent the temperature of molten steel from dropping. However, accelerating the refractory erosion by chemical reaction of slag shortens the lifetime of the equipment, or causes the boiling of the molten steel due to the oxygen content in the slag, causing the secondary phenomenon and reducing the rate of deoxidizing agent or alloy iron. Resulting in deterioration of steelmaking quality. Therefore, the preparation and control of slag in ladle has been regarded as an important technical element of steelmaking, and slag thickness management from the converter during the operation is very important for steelmaking quality control.

Slag thickness measurements can be made by various methods, such as by the use of a visor, by using an eddy current meter, by using electric resistance difference, by using oxygen concentration difference, by temperature difference, by using electromagnetic wave or laser. There is a limit to the measurement of slag thickness by the neck, and there is a high probability that an error will occur depending on the measurer. The method of using the eddy current meter and the method of using the electric resistance difference require a cooling facility and a device, and the operation is performed at a high temperature, so that it is troublesome to repair each time. A method using a difference in oxygen concentration and a method using a temperature difference do not require an accessory facility but have a problem in that the reliability of the measured value is deteriorated due to a large variation in solubility depending on immersion time. In the case of using the electromagnetic wave and the laser, when the solid slag is present, it is difficult to measure the slag thickness precisely because the electromagnetic wave or the laser causes diffuse reflection.

This makes it difficult to apply smoothly in the field, and although slag related information is important, only molten metal information is being used.

As a background related to the present invention, there is a method and apparatus for measuring the thickness of a ladle slag in a ladle refining furnace disclosed in Korean Patent Laid-Open Publication No. 10-2004-0057722 (published on July 22, 2004).

An object of the present invention is to provide a composite probe capable of measuring the slag thickness in addition to the temperature measurement function of molten metal and obtaining molten metal information and slag thickness information by one measurement.

According to an aspect of the present invention, there is provided a composite probe including: a sensor unit including a temperature sensor for sensing a temperature of a molten metal; A sensor head portion in which an upper portion of the sensor portion is exposed and a lower portion of the sensor portion is fixed inside; A protective cap for protecting the upper portion of the sensor unit; A pair of first compensation conductors electrically connected to the temperature sensor of the sensor unit; A first connector contact for electrically connecting the pair of first compensation wires to an external device; A slag thickness measuring unit disposed in the sensor head for measuring the thickness of the slag in the molten metal; And a protection tube for protecting the sensor head, the pair of first compensation wires and the slag thickness measuring unit, wherein the slag thickness measuring unit comprises: an inductor disposed at the inner side of the sensor head; A pair of second compensating conductors electrically connected to the electronic board, and a second connector for electrically connecting the pair of second compensating conductors to an external device, And a slag contact portion contacting the upper end of the slag for detecting the position of the slag.

In this case, when the protection cap is made of a metal material, the slag thickness measurement unit is preferably formed such that the inductor is not located on the same line as the protection cap.

In addition, the slag contact part may have a strip shape in which one end is exposed to the upper part of the sensor head part. In this case, the other end of the strip may be electrically connected to any one of the pair of first compensation conductors. Further, it is preferable that a distance between the strip and the inductor is 200 mm or less.

The composite probe may further include a sample collecting part for collecting molten metal, and the sample collecting part may be disposed in the sensor head part and protected by the protective cap.

According to another aspect of the present invention, there is provided a composite probe including: a sensor unit including a temperature sensor for sensing a temperature of a molten metal; A sensor head portion in which an upper portion of the sensor portion is exposed and a lower portion of the sensor portion is fixed inside; A protective cap for protecting the upper portion of the sensor unit; A pair of first compensation conductors electrically connected to the temperature sensor of the sensor unit; A first connector contact for electrically connecting the pair of first compensation wires to an external device; A slag thickness measuring unit disposed in the sensor head for measuring the thickness of the slag in the molten metal; And a protection tube for protecting the sensor head, the pair of first compensation wires and the slag thickness measuring unit, wherein the slag thickness measuring unit comprises: an inductor disposed at the inner side of the sensor head; A pair of second compensating conductors electrically connected to the electronic board, and a second connector for electrically connecting the pair of second compensating conductors to an external device, And the protection cap is formed of a metal material and serves as a slag contact portion by contacting the upper end of the slag to detect the position of the slag.

At this time, the protection cap may be electrically connected to any one of the pair of first compensation conductors.

In the case of the composite probe according to the present invention, the thickness of the slag and the temperature of the molten metal generated during the treatment of the molten metal can be simultaneously measured. Thus, the productivity can be improved by shortening the operating time.

For example, when the composite probe according to the present invention is applied to a steelmaking process, not only basic operation information (molten steel temperature and component information) can be obtained, but also the slag thickness in the ladle can be accurately measured to accurately grasp the flow rate of the converter slag And can contribute to the realization of the steelmaking model operation by utilizing it for the determination of the amount of alloy iron and sub-raw material.

1 schematically shows a composite probe according to the present invention.
2 schematically shows a cross section of a composite probe according to the present invention.
3 shows an example of wiring of a composite probe according to the present invention.
FIG. 4 shows an example of a measurement screen of a molten metal measurement system to which a composite probe according to the present invention is applied.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, And the scope of the invention is defined only by the scope of the claims set forth in the following claims.

Hereinafter, a probe capable of measuring slag thickness in molten metal according to the present invention will be described in detail with reference to the accompanying drawings.

1 schematically shows a composite probe according to the present invention. 2 schematically shows a cross section of a composite probe according to the present invention. 3 shows an example of wiring of a composite probe according to the present invention.

1 to 3, a hybrid probe according to the present invention includes a sensor unit 110, a sensor head unit 120, a protection cap 130, a pair of first compensation wires 140, (3) and (4), a protective pipe 150 and a slag thickness measurement unit 160.

The sensor unit 110 is for sensing the temperature of the molten metal, and includes a temperature sensor 111 as shown in FIG. The temperature sensor 111 may be disposed in a protective tube 112, such as a quartz tube.

The upper part of the sensor part 110 is exposed and the lower part of the sensor part 110 is fixed to the inside of the sensor head part 120. The sensor head portion 120 may be formed of, for example, a ceramic block.

The protective cap 130 protects the upper portion of the sensor unit 110. For this purpose, the protective cap 130 may have a stopper shape. The protective cap 130 may be formed of a metal, preferably a metal of the same material as the molten metal. To prevent the slag from adhering to the protective cap 130, a paper cap May be additionally formed.

The pair of first compensation wires 140a and 140b are electrically connected to the temperature sensor 111 of the sensor unit 110 to transmit a signal output from the temperature sensor 111. [

The first connector contacts (3, 4 in FIG. 3) serve to electrically couple a pair of first compensation wires 140 to an external device such as a meter.

The protective pipe 150 serves to protect the sensor head 120, the pair of compensating wire 140 and the slab thickness measuring unit 160 to be described later. The multi-branch pipe Multiple paper tubes) can be applied.

The slag thickness measuring unit 160 is disposed in the sensor head unit 120 and serves to measure the slag thickness in the molten metal. To this end, the slag thickness measurement unit 160 in the present invention includes an inductor 161, an electronic substrate 162, a second compensation wire 163, a second connector contact, and a slug contact.

The inductor 161 is disposed inside the sensor head portion 120. The inductor 161 senses the magnetic field change when the composite probe is transferred from the slag layer to the molten metal, and transmits the electrical signal corresponding to the change amount to the electronic substrate 162 described later.

When the protection cap 130 is formed of a metal such as steel, the slag thickness measurement unit 160 is preferably formed such that the inductor 161 is not located on the same line as the protection cap 130. When the inductor 161 used for detecting the slag thickness is transferred from the slag layer to the conductive molten metal, a change in the magnetic field is sensed. For example, a protective cap 130 Is protected on the inductor 161 or located on the same line as the inductor, the change of the magnetic field becomes insensitive when transitioning to the conductive molten metal, and the interface between the molten steel can not be accurately detected. Therefore, it is preferable that the inductor 161 is formed not only apart from the outside of the protection cap 130 but also inside the sensor head. This makes it possible to precisely measure the interface between the slag and the molten metal without the influence of ambient noise.

Table 1 below compares the resolution with and without interference of the inductor by a steel cap. As can be seen from Table 1, high resolution can be achieved when there is no interference of the protective cap made of steel.

[Table 1]

Figure 112014077561847-pat00001

The electronic substrate 162 is disposed at the other end of the sensor head portion 120, that is, below the inductor 161, and is electrically connected to the inductor 161. The electronic substrate 162 has an oscillation circuit and serves to remove ambient noise.

The pair of second compensation wires 163a and 163b and 163 are electrically connected to the electronic substrate 162 separately from the first compensation wire 140 to transmit signals output through the electronic substrate 162 It plays a role.

The second connector contacts (1, 2 in Fig. 3) serve to electrically couple a pair of second compensation wires 163 to an external device such as a meter.

Further, the slag thickness measuring unit 160 applied to the present invention further includes a slag contact portion contacting the top of the slag to detect the position of the slag. When the slag contact portion comes into contact with the upper surface of the slag, a short circuit is generated to detect the slag level.

The slag contact portion can be formed as a strip 164, one end of which is exposed on the sensor head front end face, that is, on the upper surface of the sensor head portion 120, as shown in Figs.

When the slag contact portion is formed by the strip 164, the other end of the strip 164 may be electrically connected to any one of the pair of first compensation conductors 140a and 140b (140b in FIG. 3). In this case, as shown in FIG. 3, four connector contacts (1, 2, 3, 4) may be formed.

In the case of the composite probe according to the present invention, the positive (+) and negative (-) lines (first compensation wire) extending from the sensor portion, the (+ , Including a total of five output lines. Terminals of currently used measuring instruments are formed by two to four lines. Therefore, the number of output lines of the composite probe and the number of terminals of the measuring instrument are not matched. This problem can be solved by connecting a strip line to either a strip line that does not affect each other independently and a first compensation lead that is connected to the sensor portion. Accordingly, the output line of the composite probe according to the present invention can be constituted by four lines, and thus the terminals of the measuring instrument are not required to be increased.

Further, the distance between the strip 164 and the inductor 161 is preferably 200 mm or less, and more preferably 150 mm or less. The thickness of the ordinary ladle slag discharged from the converter is less than 200 mm. If the point at which the change in the magnetic field of the inductor 161 is sensed after passing the upper surface of the slag layer 164 exceeds 200 mm, it is difficult to accurately detect the slag thickness. Therefore, it is preferable that the diameter of the gap between the strip 164 and the inductor 161 is located within a minimum of 150 mm.

Meanwhile, the composite probe according to the present invention can utilize the protective cap as a slug contact portion without forming a separate slag contact portion such as a strip. This is made possible by forming the protective cap 130 from a metal material and contacting the top of the slag with the protective cap 130 to detect the position of the slag. In this case, the protective cap 130 may be electrically connected to any one of the pair of conductors included in the first compensation conductor 140, as in the case of applying the strip 164 described above.

The composite probe capable of measuring the temperature of the molten metal and measuring the slag thickness has been described above. However, the composite probe according to the present invention is not limited to this, and it is also possible to obtain a sample of molten metal by further including a sample collection unit 170 as in the example shown in FIG. 1 or FIG.

Referring to FIGS. 1 and 2, the sample collecting unit 170 may be disposed on the sensor head unit 120 and may be formed to be protected by the protective cap 130.

FIG. 4 shows an example of a measurement screen of a molten metal measurement system to which a composite probe according to the present invention is applied.

When the composite probe of the present invention is used, it is possible to simultaneously measure the slag thickness together with the temperature, and furthermore, the temperature and the slag thickness can be displayed simultaneously and separately from the temperature as shown in the example shown in FIG.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (8)

A sensor unit including a temperature sensor for sensing a temperature of the molten metal;
A sensor head portion in which an upper portion of the sensor portion is exposed and a lower portion of the sensor portion is fixed inside;
A protective cap for protecting the upper portion of the sensor unit;
A pair of first compensation conductors electrically connected to the temperature sensor of the sensor unit;
A first connector contact for electrically connecting the pair of first compensation wires to an external device;
A slag thickness measuring unit disposed in the sensor head for measuring the thickness of the slag in the molten metal; And
And a protection pipe for protecting the sensor head, the pair of first compensation wires and the slag thickness measuring unit,
Wherein the slag thickness measuring unit comprises:
An inductor disposed on the inner side of the sensor head portion,
An electronic substrate disposed under the inductor and electrically connected to the inductor,
A pair of second compensation conductors electrically connected to the electronic substrate,
A second connector contact for electrically connecting the pair of second compensation wires to an external device,
And a slag contact portion contacting the top of the slag for detecting the position of the slag.
The method according to claim 1,
The protective cap is made of a metal material,
Wherein the slag thickness measurement unit is formed such that the inductor is not positioned coaxially with the protective cap.
The method according to claim 1,
Wherein the slag contact portion has a shape of a strip whose one end is exposed at an upper portion of the sensor head portion.
The method of claim 3,
And the other end of the strip is electrically connected to any one of the pair of first compensation conductors.
The method of claim 3,
And a distance between the strip and the inductor is 200 mm or less.
The method according to claim 1,
Wherein the composite probe comprises:
Further comprising a sample collecting section for sampling the molten metal,
Wherein the sample collecting part is disposed in the sensor head part and is protected by the protective cap.
A sensor unit including a temperature sensor for sensing a temperature of the molten metal;
A sensor head portion in which an upper portion of the sensor portion is exposed and a lower portion of the sensor portion is fixed inside;
A protective cap for protecting the upper portion of the sensor unit;
A pair of first compensation conductors electrically connected to the temperature sensor of the sensor unit;
A first connector contact for electrically connecting the pair of first compensation wires to an external device;
A slag thickness measuring unit disposed in the sensor head for measuring the thickness of the slag in the molten metal; And
And a protection pipe for protecting the sensor head, the pair of first compensation wires and the slag thickness measuring unit,
The slag thickness measuring unit
An inductor disposed on the inner side of the sensor head portion,
An electronic substrate disposed under the inductor and electrically connected to the inductor,
A pair of second compensation conductors electrically connected to the electronic substrate,
And a second connector contact for electrically connecting the pair of second compensation conductors to an external device,
Wherein the protective cap is formed of a metal material and serves as a slag contact portion by contacting the upper end of the slag to detect the position of the slag.
8. The method of claim 7,
And the protective cap is electrically connected to any one of the pair of first compensation conductors.
KR1020140106737A 2014-08-18 2014-08-18 Combination probe capable of measuring thickness of slag in metal melts KR101577809B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060075626A (en) * 2004-12-28 2006-07-04 주식회사 포스코 Hybrid single combination probe
KR20070078385A (en) * 2006-01-26 2007-07-31 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. Apparatus for determination of an interface of a slag layer
KR20130077635A (en) * 2011-12-29 2013-07-09 우진 일렉트로나이트(주) Complex probe gathering sample of molten metal and slag simultaneously

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060075626A (en) * 2004-12-28 2006-07-04 주식회사 포스코 Hybrid single combination probe
KR20070078385A (en) * 2006-01-26 2007-07-31 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. Apparatus for determination of an interface of a slag layer
US20070176334A1 (en) * 2006-01-26 2007-08-02 Heraeus Electro-Nite International N.V Apparatus for Determination of an Interface of a Slag Layer
KR20130077635A (en) * 2011-12-29 2013-07-09 우진 일렉트로나이트(주) Complex probe gathering sample of molten metal and slag simultaneously

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