KR20120067786A - Apparatus for measuring stave's thickness of furnace and method of measuring stave's thickness using the same - Google Patents

Abstract

PURPOSE: A device and a method for measuring a thickness of a stave of a furnace are provided to extract an exact residual thickness by preventing errors when measuring a residual thickness of a stave having a groove and to maximize performance and a lift time of a furnace. CONSTITUTION: A device and a method for measuring a thickness of a stave of a furnace comprises a sensing unit(210) and an ultra detector(220). The sensing unit inserted into a cooling pipe comprises in a stave of a furnace transmits ultrasonic waves to selectable one spot of the stave and receives the reflected ultrasonic waves. The ultra detector connected to the sensing unit measures a thickness of the stave by visualizing a sectional structure of the stave into images with ultrasonic waves reflected from a plurality of spots of the stave.

Description

Apparatus for measuring stave's thickness of furnace and method of measuring stave's thickness using the same}

The present invention relates to a device and method for measuring the thickness of a blast furnace, and more particularly to a device and method for measuring the thickness of a blast furnace to measure the remaining thickness of the stave provided in the blast furnace to improve the performance of the blast furnace. It is about.

In the steel industry, blast furnaces are charged with iron ore, which is the main raw material, and coal, which is a fuel, in the form of sintered ore and coke, and is a facility for producing iron oxide in the molten state, that is, molten iron, through a reduction reaction.

At this time, a high temperature hot air is supplied into the blast furnace for the reduction reaction, and the molten iron produced is accumulated in the bottom of the blast furnace.

When the molten iron stored in the furnace accumulates in a predetermined amount or more, the molten iron is periodically discharged from the outlet located at the upper end of the furnace under the tuyere for supplying hot air to be supplied to the steelmaking process.

On the other hand, since the height of the sintered ore and the coke is gradually lowered in the furnace, which is the upper part of the blast furnace through the molten iron manufacturing process by the reduction reaction, the sintered ore and coke are continuously supplied sequentially and the supplied fuel naturally descends.

Here, the blast furnace includes a cooling mechanism inside the shell, which is an outer wall of the blast furnace, in order to protect the furnace body from the descending fuel, raw materials, high temperature hot air and reaction heat.

Conventionally, such a cooling mechanism uses a cooling panel inserted vertically into the steel shell surface of the blast furnace, but gradually increasing the cooling efficiency is a trend.

However, the stave may cause damage that accelerates abrasion in the operation of the high lead-out ratio and damages the cooling water pipe inside the stave, which causes the problem that the coolant flows into the blast furnace and lowers the temperature inside the blast furnace. .

Therefore, it is urgent to study to improve the productivity and performance of the blast furnace by measuring the remaining thickness of the stave to prevent breakage of the stave to prevent the coolant from leaking into the blast furnace.

An object of the present invention is to provide an apparatus and method for measuring the thickness of a blast furnace to prevent an error in measuring the thickness of the grooved stave thickness and to measure an accurate remaining thickness to prevent the coolant from leaking into the blast furnace. .

An apparatus for measuring the thickness of a blast furnace according to an embodiment of the present invention is inserted into a cooling pipe provided in a stave of a blast furnace, and a sensing unit receiving ultrasonic waves reflected by transmitting ultrasonic waves to a point of the selectable stave. ; And an ultrasonic flaw detector connected to the sensing unit to measure the thickness of the stave by imaging a cross-sectional structure of the stave from the signals of the ultrasonic wave transmitted from the sensing unit and reflected at multiple points of the stave. It may include.

The sensing unit of the apparatus for measuring the thickness of a blast furnace blast furnace according to an embodiment of the present invention may include a plurality of piezoelectric elements to select a point of the stave to measure thickness.

The transceiver of the sensing unit of the stave thickness measurement apparatus of the blast furnace according to an embodiment of the present invention may be formed in a shape corresponding to the inner surface shape of the cooling pipe so that the end is in close contact with the cooling pipe. .

The transceiver of the apparatus for measuring the thickness of the blast furnace blast furnace according to an embodiment of the present invention has at least one point of the end and the radius of curvature of the inner surface of the cooling pipe so that the end is in close contact with the cooling pipe It is possible to form the same radius of curvature.

The ultrasonic flaw detector of the apparatus for measuring thickness of a blast furnace according to an embodiment of the present invention may be a phased array type imaging apparatus so as to control a traveling direction of ultrasonic waves transmitted from the sensing unit.

According to another aspect of the present invention, a method for measuring a thickness of a blast furnace includes inserting a sensing unit into a cooling pipe provided at a stave of the blast furnace, and contacting the sensing unit with the cooling pipe toward a central axis of the blast furnace; And measuring the thickness of the stave by transmitting and receiving an ultrasonic wave to a point of the stave selectable by the sensing unit.

Blocking the inflow of the coolant flowing into the cooling pipe of the stave before the step of contacting the sensing unit in the cooling pipe of the stave thickness measurement method of the blast furnace according to another embodiment of the present invention; And applying a contact medium to an end portion of the sensing unit which is in contact with the inner surface of the cooling pipe.

Measuring the thickness of the stave of the stave thickness measurement method of the blast furnace according to another embodiment of the present invention is controlled by the ultrasonic flaw detector connected to the sensing unit, the direction of the ultrasonic wave from the sensing unit The cross-sectional structure of the stave can be imaged from the signal of the ultrasonic wave transmitted and reflected at multiple points of the stave to selectively measure the thickness of the required point of the stave.

According to the apparatus and method for measuring the thickness of the blast furnace according to the present invention, it is possible to extract the correct residual thickness by preventing errors when measuring the remaining thickness of the stave with the groove groove, the performance of the blast furnace by the accurate residual thickness measurement Maximize your life.

1 is a schematic cutaway perspective view illustrating a blast furnace in which a device for measuring the thickness of a blast furnace according to an embodiment of the present invention is used;
2 is a schematic cross-sectional view and a schematic front view showing a stave in which a stave thickness measuring apparatus of a blast furnace is used according to an embodiment of the present invention.
Figure 3 is a schematic perspective view showing a stave thickness measurement apparatus of the blast furnace according to an embodiment of the present invention.
Figure 4 is an explanatory diagram for explaining the operation of the stave thickness measurement apparatus of the blast furnace according to an embodiment of the present invention.
5A and 5B are enlarged views of FIG. 4A seen from the upper side.
6 is a flow chart showing a stave thickness measurement method of the blast furnace according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention may deteriorate other inventions or the present invention by adding, modifying, or deleting other elements within the scope of the same idea. Other embodiments that fall within the scope of the inventive concept may be readily proposed, but they will also be included within the scope of the inventive concept.

In addition, the components with the same functions within the scope of the same idea shown in the drawings of each embodiment will be described using the same reference numerals.

1 is a schematic cutaway perspective view illustrating a blast furnace in which a device for measuring stave thickness of blast furnace according to an embodiment of the present invention is used.

Referring to FIG. 1, a blast furnace 100 in which a device for measuring thickness of a blast furnace according to an embodiment of the present invention is used may include a stave 110, a refractory 120, and a shell 130.

Here, the blast furnace 100 is charged with iron ore as the main raw material and coal as fuel in the form of sintered ore and coke, and the fuel, raw material, which is lowered to a facility for manufacturing iron oxide in a molten state of iron, that is, molten iron through a reduction reaction. In order to protect the furnace body from high heat and reaction heat, the above-mentioned stave 110, the refractory 120 and the shell 130 may be provided.

The refractory 120 may be disposed inside and outside the stave 110, and may be sufficiently resistant to high temperatures without being softened at high temperatures, and may withstand chemical effects. Material may be present.

Here, the cooling mechanism is installed inside the steel shell 130, which is the outer wall of the blast furnace 110 to cool and protect the furnace body from the falling fuel, raw materials, high temperature hot air and reaction heat in the blast furnace 110, It may be a wide panel installed in parallel with the surface of the iron shell 130, it may be provided with a cooling pipe 114.

The cooling pipe 114 is a flow path of the cooling water to protect the furnace body from the hot air and the reaction heat of the high heat by the cooling water, and is formed in communication with the water supply pipe (118, Fig. 2) and the drain pipe (116, Fig. 2). Can be.

2 is a schematic cross-sectional view and a schematic front view showing a stave in which a stave thickness measuring apparatus of a blast furnace is used according to an embodiment of the present invention.

Referring to FIG. 2, in the stave 110 according to the present invention, the groove 112 may be processed on the outer surface facing the blast furnace 100, and the stave 110 may be processed by the groove 112. ), The thickness may not be constant, and thick and thin portions may be repeatedly formed.

A cooling pipe 114 may be formed inside the stave 110 to cool the temperature inside the blast furnace 100.

Here, the cooling pipe 114 may be formed in about five inside the stave 110, the blast furnace 100 may be provided with a plurality of staves (110).

In addition, the cooling pipe 114 may be in communication with the water supply pipe 118 and the drain pipe 116 to allow the cooling water to flow in and out, and the water supply pipe 118 and the drain pipe 116 is the shell of the blast furnace 110 ( 130 is extended to the outside to connect the flexible hose from the outside to the water supply pipe 118 and the drain pipe 116 can supply the cooling water.

Here, if the inner surface 114a and the outer surface 114b of the cooling pipe 114 are defined, the inner surface 114a is disposed adjacent to the inner side of the blast furnace 100 as shown in FIGS. 2 and 4. The outer surface 114b may mean an inner surface of the cooling pipe 114 close to the iron shell 130 of the blast furnace 110.

Figure 3 is a schematic perspective view showing a stave thickness measuring apparatus of the blast furnace according to an embodiment of the present invention, Figure 4 is a description for explaining the operation of the stave thickness measuring apparatus of the blast furnace according to an embodiment of the present invention 5A and 5B are enlarged views of A of FIG. 4 as viewed from the upper side.

3 to 5, the stave thickness measuring apparatus 200 of the blast furnace according to an embodiment may include a sensing unit 210 and an ultrasonic flaw detector 220.

The sensing unit 210 may be inserted into the cooling pipe 114 provided in the stave 110 of the blast furnace 100, and transmits the ultrasonic wave to one point of the stave 110 to receive the reflected ultrasonic wave. Can be.

Meanwhile, the sensing unit 210 may include a transceiver 210a and an extension member 210b, and the ultrasound may be transmitted and received by the transceiver 210a.

Here, the end of the sensing unit 210, that is, the end 210a 'of the transceiver 210a of the cooling pipe 114 to be in close contact with the inner surface (114a) of the cooling pipe 114 It may be formed in a shape corresponding to the inner surface shape.

That is, the end portion 210a of the transceiver 210a is rounded to correspond to the shape of the inner surface 114a of the cooling pipe 114 as shown in FIG. 5 and is formed on the inner surface 114a of the cooling pipe 114. Can be brought into close contact.

In addition, at least one point of the end of the transceiver 210a which is at least one point of the end of the sensing unit 210 has a radius of curvature equal to the radius of curvature of the inner surface 114a of the cooling pipe 114. It may be provided in close contact with the inner surface (114a) of the cooling pipe 114.

This is to maximize the size of the plurality of piezoelectric ceramics 215 to be described later provided inside the transceiver 210a to maximize the transmission and reception rate of the ultrasonic waves.

On the other hand, when the transceiver 210a is in contact with the cooling pipe 114 to transmit and receive the ultrasonic wave, the contact medium 230 may be applied to the end 210a 'of the transceiver 210a.

That is, when the contact medium 230 is not applied, the ultrasonic wave transmitted to the transceiver 210a may not be transferred into the stave 110, and most of the ultrasonic waves may be reflected from the inner surface 114a of the cooling pipe 114. .

In other words, the contact medium 230 removes air between the transceiver 210a and the inner surface of the cooling conduit 114 of the stave 110 and adjusts the acoustic impedance of the transceiver 210a and the stave 110. In this case, the surface of the transceiver 210a and the stave 110 may be filled to make the surface uniform.

In addition, a plurality of piezoelectric elements 215 may be disposed in the transceiver 210a to transmit ultrasonic waves to the stave 110 and receive ultrasonic waves reflected from the stave 110.

That is, the plurality of piezoelectric elements 215 may select one point of the stave 110 when the remaining thickness of the stave 110 is to be measured.

In other words, the transceiver 210a may be an array ultrasonic sensor composed of a plurality of piezoelectric elements 215, and a plurality of directions of ultrasonic waves transmitted by the plurality of piezoelectric elements 215 may be provided.

Therefore, since the thickness of the stave 110 is not fixed by the groove 112, that is, the remaining thick portion and the thin portion are separated, respectively, the ultrasonic wave can be transmitted and received. By selecting one point of the stave 110 may be more accurate residual thickness measurement.

Here, when the wear of the stave 110 is described, the thick portion is due to the groove 112, the wear portion is substantially progressing than the thin portion, the thickness measurement position of the thick portion and the thin portion If it is near the boundary area, the ultrasonic signal is reflected at these two places, and there is a possibility that the signal of the thinner side is determined as the signal corresponding to the thickness.

In this case, the residual thickness of the thick portion that is substantially worn is not measured, thereby generating an error in extracting the remaining thickness of the stave 110. However, according to the stave thickness measuring apparatus 200 of the blast furnace according to the present invention, Since one point of the eve 110 can be selected, an accurate residual thickness measurement can be performed without errors.

The selection of one point of the desired stave 110 as described above may be controlled by the ultrasonic flaw detector 220 to be described later, and the ultrasonic flaw detector will be described below.

As described above, the ultrasonic waves transmitted from the plurality of piezoelectric elements 215 are incident to the inside of the stave 110 and then reflected by the multiple points of the inner surface 110a of the stave 110. The remaining thickness of the selected point of the stave 110 may be measured from the inner surface 114a of the cooling pipe 114 through the time taken for the piezoelectric element 215 to receive.

However, the piezoelectric element 215 may be movable inside the transceiver 210a, and the piezoelectric element 215 may be ultrasonically directed to a plurality of points of the inner surface 110a of the stave 110 while the piezoelectric element 215 moves. Note that it may also send and receive.

Here, the extension member 210b constituting the sensing unit 210 may be formed to extend from the transceiver 210a and may be formed to be bent according to the shapes of the water supply pipe 118 and the drain pipe 116.

That is, the transceiver 210a may be provided at one end of the extension member 210b and may contact the inner surface 114a of the cooling pipe 114 of the stave 110 by the extension member 210b.

In addition, the extension member 210b has a diameter smaller than the diameter of the water supply pipe 118 or the drain pipe 116, which provides an inflow and outflow path of the coolant flowing into and out of the cooling pipe 114, and the extension member 210b includes the water supply pipe 118. ) Or longer than the length from the drain pipe 116 to the inner surface 114a of the cooling pipe 114.

In addition, the extension member 210b may be in contact with the inner surface 114a of the cooling pipe 114 regardless of the shape of the cooling pipe 114 extending from the water supply pipe 118 or the drain pipe 116. It can be formed so as to be bent.

That is, when the shape of the cooling pipe 114 extending from the water supply pipe 118 or the drain pipe 116 is a curved pipe (tube with curvature), the transceiver 210a is in contact with the inner surface 114a of the cooling pipe 114. The extension member 210b may be bent.

In addition, the extension member 210b may be configured to be stretchable according to the distance from the water supply pipe 118 or the drain pipe 116 to the inner surface 114a of the cooling pipe 114.

Therefore, the transmitting and receiving unit 210a of the sensing unit 210 may be movable in the cooling pipe 114, while the transmitting and receiving unit 210a moves in sequence of the inner surface (110a) of the stave 110 Ultrasonic waves can be sent and received for multiple points.

Here, the ultrasonic flaw detector 220 may be composed of a plurality of channels, and at the same time, the ultrasonic propagation direction of the sensing unit 210 may be electronically controlled by appropriately controlling a delay time of each channel through which ultrasonic waves are transmitted and received.

That is, the ultrasonic flaw detector 220 may be a phased array imaging device, and the ultrasonic flaw detector 220 may be sent from the sensing unit 210 by operating the sensing unit 210 and the stave 110. The cross-sectional structure of the stave 110, which is the thickness measurement target, may be imaged from the signals of the ultrasonic waves reflected from a plurality of points of the) to selectively measure the required thickness.

Meanwhile, the ultrasonic flaw detector 220 may display the information on the remaining thickness of the stave 110 by imaging the cross-sectional structure of the stave 110 and may be formed to have a portable size.

6 is a flow chart showing a stave thickness measurement method of the blast furnace according to an embodiment of the present invention.

Referring to Figure 6, first to block the inflow of the cooling water flowing into the cooling pipe 114 of the stave 110 in order to measure the thickness of the stave 110 of the blast furnace 100 (S10).

Then, the contact medium is applied to the end of the sensing unit 210 in contact with the inner surface 114a of the cooling pipe 114 (S20).

That is, the contact medium 230 is applied to the ultrasonic wave emitted from the transceiver 210a to the end 210a 'of the transceiver 210a of the sensing unit 210 to be incident into the stave 110. do.

As described above, the contact medium 230 removes air between the transceiver 210a and the inner surface of the cooling pipe 114 of the stave 110, and the transceiver 210a and the stave 110. Harmonize the acoustic impedance of the), and fill the space between the transceiver 110 and the stave (110).

Therefore, the ultrasonic wave transmitted from the transceiver 210a can stably enter the inside of the stave 110.

When the application of the contact medium 230 is completed, the sensing unit 210 is inserted into the cooling pipe 114 provided in the stave 110 of the blast furnace 100 and the inner surface 114a of the cooling pipe 114. Contact (S30).

Thereafter, the sensing unit 210 transmits and receives an ultrasonic wave to the stave 110 (S40), and then measures a remaining thickness of one point of the stave 110 selectable through the ultrasonic wave transmitted and received (S50). .

In other words, ultrasonic waves transmitted from the sensing unit 210 including the plurality of piezoelectric elements 215 are incident into the stave 110 and then reflected by the inner surface 110a of the stave 110 and returned. The remaining thickness of the selected point of the stave 110 may be measured from the inner surface 114a of the cooling pipe 114 through the time taken for the piezoelectric element 215 to receive the ultrasonic wave.

In addition, the step (S50) of measuring the thickness of the stave is controlled by the ultrasonic flaw detector 220 connected to the sensing unit 210, the direction of the ultrasonic wave is sent from the sensing unit 210 and the The thickness of the required point of the stave 110 may be selectively measured by imaging the cross-sectional structure of the stave 110 from the signals of the ultrasonic waves reflected from multiple points of the stave 110.

In addition, the wear thickness of the stave 110 may be measured by periodically measuring the remaining thickness of the selected point of the stave 110 and making a database thereof.

Through the above embodiment, in measuring the remaining thickness of the stave 110 that is responsible for cooling the blast furnace 100, a thick portion and a thin portion through the sensing unit 210 made of a plurality of piezoelectric elements 215 In the structure of the stave 110 repeatedly formed, a thickness of a desired position may be selectively measured.

In addition, it is possible to maximize the performance and life of the blast furnace 100 because it is possible to extract the exact remaining thickness by preventing the error when measuring the remaining thickness of the stave 110.

100: blast furnace 110: stave
112: Grove 114: Cooling piping
118: water supply pipe 116: drain pipe
200: device for measuring the thickness of the blast furnace
210: sensing unit 215: piezoelectric ceramic
220: ultrasonic flaw detector

Claims (8)

A sensing unit inserted into a cooling pipe provided in a blast furnace, transmitting ultrasonic waves to one point of the selectable stave, and receiving the reflected ultrasonic waves; And
An ultrasonic flaw detector connected to the sensing unit and configured to measure a thickness of the stave by imaging a cross-sectional structure of the stave from the ultrasonic signals transmitted from the sensing unit and reflected at a plurality of points of the stave; Device for measuring the thickness of a blast furnace.
The method of claim 1,
The sensing unit for measuring the thickness of the blast furnace, characterized in that the sensing unit includes a plurality of piezoelectric elements to select a point of the stave to measure the thickness.
The method of claim 1,
The sensing unit is a stave thickness measuring apparatus of the blast furnace, characterized in that the end portion is formed in a shape corresponding to the inner surface shape of the cooling pipe so that the end is in close contact with the cooling pipe.
The method of claim 1,
Measuring the thickness of the blast furnace blast furnace, characterized in that at least one point of the end forms a radius of curvature equal to the radius of curvature of the inner surface of the cooling pipe so that the sensing portion is in close contact with the cooling pipe Device.
The method of claim 1,
The ultrasonic flaw detector is a stave thickness measuring apparatus of a blast furnace, characterized in that the phased array type imaging device to control the direction of the ultrasonic wave transmitted from the sensing unit.
Inserting a sensing unit into a cooling pipe provided in a stave of the blast furnace to contact the sensing unit with the cooling pipe toward a central axis of the blast furnace; And
And measuring the thickness of the stave by transmitting and receiving an ultrasonic wave to a point of the stave selectable by the sensing unit.
The method of claim 6,
Before the step of contacting the sensing unit with the cooling pipe,
Blocking the inflow of the cooling water flowing into the cooling pipe of the stave; And
A method of measuring the thickness of the blast furnace, characterized in that it further comprises the step of applying a contact medium to the end of the sensing portion in contact with the inner surface of the cooling pipe.
The method of claim 6,
Measuring the thickness of the stave is controlled by the ultrasonic flaw detector connected to the sensing unit to control the direction of the ultrasonic wave, and from the signal of the ultrasonic wave transmitted from the sensing unit and reflected at multiple points of the stave A method for measuring the thickness of a blast furnace, characterized in that for imaging the cross-sectional structure of the stave to selectively measure the thickness to the required point of the stave.

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