KR101839841B1 - Apparatus and Method for measuring molten steel height - Google Patents

Abstract

The present invention relates to an apparatus for calculating the height of molten metal stored in a container provided with an outlet, which comprises: a measurement unit installed in the container to measure an induced electromotive force generated by movement of the molten metal at each height; and a treatment unit determining the height of the molten metal by using values measured for each height. Therefore, the height of the molten metal can be accurately measured.

Description

Technical Field [0001] The present invention relates to an apparatus for measuring the height of a bath surface,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for measuring a bath surface height and a measuring method, and more particularly, to a bath surface height measuring apparatus and a measuring method capable of accurately measuring a bath surface height of molten metal.

Generally, blast furnace operation is a process of charging iron ore and coke to the upper part of a blast furnace, a process of burning coke by blowing hot wind with a tug formed in the blast furnace, a process of removing impurities and oxygen of iron ores by the heat and gas generated by burning coke, . ≪ / RTI > The molten iron in the liquid state is stored in the lower part of the blast furnace, and is discharged through the outlet after a lapse of a predetermined time.

At this time, if the iron wire is stored at a height above the blast furnace because the outgoing operation is not properly performed, the hot air supplied through the tuyere can not be smoothly supplied into the blast furnace, and the blowing pressure may increase. If this phenomenon becomes worse, drifting may occur in the blast furnace and the efficiency of the blast furnace operation may be lowered. In addition, the tugboat can flow backward and damage the tuyere, and the entire blast furnace operation can be interrupted. Therefore, it is necessary to measure the charter height in the blast furnace and maintain it appropriately.

Conventionally, the amount of raw materials such as iron ore and coke to be charged into a blast furnace to measure the height of the charcoal is compared with the amount of charcoal discharged, and the charter height inside the blast furnace is predicted. However, since there is a limit in accurately calculating the amount of the raw material charged into the blast furnace, there is a problem that the charter height can not be accurately predicted.

Alternatively, a stress sensor is used to measure the stress transmitted to the blast furnace sheath, or the amount of return of the current flowing into the blast furnace is measured to predict the charter height, but the utilization is very low due to the low accuracy. Therefore, a technique for precisely measuring the height of the furnace crucible is required.

KR 2001-0019977 A KR 2010-0071347 A

The present invention provides an apparatus and method for measuring a bath surface height that can accurately measure the bath surface height of a molten metal.

The present invention provides a device for measuring a bath surface height and a measuring method capable of reliably performing a work for leaving a molten metal.

An apparatus for measuring the height of a bath surface of a molten metal accommodated in a container provided with an outlet, the apparatus comprising: a measuring unit installed in the vessel to measure induction electromotive force generated by movement of molten metal by height; And a processing unit for determining the height of the molten metal bath surface by using the measured values for each height.

The measuring unit includes a plurality of measuring devices arranged in the vertical direction.

A tuyere is formed in the vessel to supply hot air, and the plurality of measuring instruments are disposed between the outlet and the tuyere.

The plurality of outlets are provided, and the measuring unit includes a plurality of measuring devices installed for each of the plurality of outlets.

The processor includes a processor for finding a maximum value of the electromotive force values measured for each height, and selecting the measured height as the height of the molten metal bath surface.

And a control unit connected to the processing unit and capable of controlling opening and closing of the outlet.

Wherein the control unit includes: a comparator for comparing a height value at which the maximum induced electromotive force is measured with a preset height range; And a controller for adjusting the time when the outlet is opened when the height value is out of the set height range.

The plurality of outlets may be provided, and the controller may control a time when the plurality of outlets are opened together.

The present invention relates to a method for measuring the height of a bath surface of molten metal in a container, comprising the steps of: opening an outlet provided in the container; Discharging molten metal in the container; Closing the outlet; Measuring the induced electromotive force generated by the movement of the molten metal by height; And deriving a bath surface height of the molten metal using the measured values.

The process of deriving the bath surface height of the molten metal is a process of finding the maximum value of the induced electromotive force measured for each height; And a step of selecting a height at which the maximum induced electromotive force is measured as the height of the molten metal bath surface.

The plurality of outlets are provided, and the step of measuring the induced electromotive force by height includes a step of measuring induced electromotive force for each of the plurality of outlets.

The step of finding the maximum value of the induced electromotive force measured for each of the heights includes the step of determining one outlet using the induced electromotive force measured for each of the plurality of outlets and finding the maximum value at the determined outlet.

The step of measuring the induced electromotive force by height includes the step of measuring the induced electromotive force at the outlet which is opened or closed among the plurality of outlets.

Deriving the height of the molten metal bath surface, and comparing the derived height value with a predetermined setting range; And adjusting the amount of molten metal discharged when the derived height value is out of the setting range.

The process of controlling the amount of molten metal to be discharged includes the step of adjusting the time for opening the outlet.

The plurality of outlets may overlap with each other, and the process of adjusting the time for opening the outlet may include adjusting at least one of a time when each outlet is opened and a time when the plurality of outlets are opened together .

The step of measuring the induced electromotive force by height includes a step of sequentially measuring the induced electromotive force from the lower side to the upper side.

The container includes a blast furnace or a FINEX melting furnace, and the molten metal includes a molten metal.

According to embodiments of the present invention, the induced electromotive force due to the horizontal behavior of the molten metal can be measured by height when stopping the discharge of the molten metal stored in the container. Thus, the height of the molten metal bath surface can be accurately measured using the measured electromotive force.

Further, since the height of the molten metal bath surface can be accurately measured, it is possible to determine the amount of molten metal to be discharged so that a proper amount of molten metal is stored in the container. Thus, the discharge of the molten metal can be performed stably, so that the amount of the molten metal in the container can be properly maintained. Therefore, it is possible to suppress or prevent the increase of the blowing pressure in the vessel, the occurrence of drift, or the backflow of the molten metal into the tuyere.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a structure of a blast furnace facility according to an embodiment of the present invention; FIG.
2 is a view showing an apparatus for measuring a bath surface height according to an embodiment of the present invention.
3 is a view showing a change in height of molten steel above an outlet according to an embodiment of the present invention.
4 is a flowchart showing a method of measuring the bath surface height according to an embodiment of the present invention.
5 shows an exit schedule for a plurality of outlets according to an embodiment of the present invention.
6 is a graph showing measurement results of induced electromotive force measured by height according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in 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, It is provided to let you know. To illustrate the invention in detail, the drawings may be exaggerated and the same reference numbers refer to the same elements in the figures.

1 is a view showing a structure of a blast furnace facility according to an embodiment of the present invention. Although the embodiment of the present invention exemplifies the apparatus for measuring the bath surface height in the blast furnace 11, the application range is not limited to this, and the bath surface height measuring device may be installed in various containers storing the molten metal such as a FINEX melting furnace have.

Referring to FIG. 1, the blast furnace 11 is a facility for continuously producing molten iron using iron ore and coke. The blast furnace 11 may be formed in the form of a container having an open upper portion and an inner space. The outer shape of the blast furnace 11 is made of iron, and the refractory can be built inside the iron foil 11a. When molten metal (or charcoal or slag) is melted in the lower part of the inner space of the blast furnace 11 when iron ore, coke and the like are charged into the open upper part of the blast furnace 11, Lt; / RTI >

A tuyeres (12) may be formed in the lower part of the blast furnace (11). The tuyeres 12 can be connected to the hot air supply line 20 and hot air supplied from the hot air supply line 20 can blow hot air into the blast furnace 11. A plurality of tuyeres (12) may be provided and arranged radially along the periphery of the blast furnace (11).

The hot air supply line 20 includes an annular tube 21 surrounding the periphery of the blast furnace 11 to uniformly supply hot air supplied from a hot air path to the inner space of the blast furnace 11, And a blower tube 22 branching from each of the tuyeres 12 to each other. Therefore, hot air supplied from the hot air path can be uniformly introduced into the blast furnace 11 through the plurality of tuyeres 12. [

An outlet 13 may be formed in the lower part of the blast furnace 11. The outlet (13) is located below the tuyeres (12). A plurality of outlets 13 may be provided. For example, four outlets 13 may be provided and arranged in four directions along the periphery of the blast furnace 11, respectively. The outlet 13 is openable and closable. The amount of the molten metal stored in the blast furnace 11 can be increased by closing the outlet 13 and the molten metal stored in the blast furnace 11 can be taken out when the outlet 13 is opened. However, the number of the outlets 13 and the structure of the blast furnace 11 are not limited to these and may vary.

At this time, if the molten metal is stored at a height above the blast furnace 11, the hot air supplied through the tuyeres 12 can not be smoothly supplied into the blast furnace 11, thereby increasing the blowing pressure. If such a phenomenon becomes severe, a drift may occur in the blast furnace 11 and the efficiency of blast furnace operation may be reduced. Further, the molten metal may flow backward through the tuyeres 12 to damage the tuyere 12, and the entire blast furnace operation may be interrupted. Therefore, it is necessary to measure the height of the molten iron in the blast furnace 11 and properly maintain it.

FIG. 2 is a view showing an apparatus for measuring a bath surface height according to an embodiment of the present invention, and FIG. 3 is a view showing a change in height of molten steel above an outlet according to an embodiment of the present invention.

Referring to FIG. 2, an apparatus for measuring a bath surface height 100 according to an embodiment of the present invention is an apparatus for measuring the height of a bath surface of a molten metal accommodated in a vessel provided with an outlet 13, And a processing unit 120 for determining the height of the bath surface of the molten metal by using measured values for each height. The bath surface height measuring apparatus 100 may further include a control unit 130 connected to the processing unit 120 to control the opening and closing of the outlet 13. [ At this time, the vessel may be a blast furnace 11 or a FINEX melting furnace, and the molten metal may be a molten iron S.

The measuring unit 110 measures the induced electromotive force by the movement of the molten iron S in the blast furnace 11 by height. The measuring unit 110 includes a plurality of measuring instruments 111 arranged in the vertical direction.

The measuring device 111 can measure the induced electromotive force. The blast furnace 11 has an outer surface made of an iron fiber 11a and an inner surface made of a refractory 11b. The measuring device 111 penetrates the iron fiber 11a and the refractory 11b from the outside of the blast furnace 11 . Accordingly, the measuring device 111 can be brought close to the charter S, and the measuring devices 111 can more accurately measure the induced electromotive force variation.

The measuring device 111 may be composed of an electrode penetrating the refractory 11b of the blast furnace 11 and a lead connected to the electrode. The refractory 11b can protect the electrode from the high temperature of the molten iron S. [ However, the present invention is not limited to this, and the measuring device 111 may be formed in the form of a single lead wire such as a platinum wire.

The measuring device 111 can be detachably installed in the blast furnace 11. Therefore, when the measuring instrument 111 is broken by using for a long time, the measuring instrument 111 can be easily separated from the blast furnace 11 and replaced. Therefore, maintenance of the measuring unit 110 can be facilitated.

At this time, the phenomenon that the current is induced in the coil by the relative movement of the magnet and the coil is called electromagnetic induction phenomenon, and the electromotive force generated by the electromagnetic induction phenomenon is called induced electromotive force. An induced magnetic field may be generated when the molten iron S moves, and the measuring device 111 can measure the induced electromotive force generated at this time.

3, only the charcoal line S close to the outlet 13 is discharged through the outlet 13 due to the viscosity of the charcoal line S and the influence of the surface tension. And the molten iron S in the other area can not smoothly move to the outlet 13. [ Therefore, the height of the bath surface of the molten iron S on the outlet 13 can be relatively lower than the bath surface height of the molten iron S in the other area. Therefore, when the outlet 13 is closed, the molten iron S on the outlet 13, which was temporarily lowered during the opening period due to the nature of the molten iron S in the blast furnace 11 becoming horizontal, And can be made equal in height to the chartered line S in the other area.

The plurality of measuring devices 111 can measure the magnitude of the induced electromotive force by the movement of the molten iron S by the height when the molten iron S is horizontal. Since the bath surface of the molten iron S moves from the lower side to the upper side and is restored, the induced electromotive force can be sequentially measured from the lowest placed measuring device 111 to measure the induced electromotive force to the uppermost measuring device 111 . It is possible to measure the bath surface height of the molten iron S by using the values measured by the measuring devices 111. [

The blast furnace 11 is provided with a tuyeres 12 through which hot air can be supplied and an outlet 13 through which the hot wire S is discharged. The plurality of measuring devices 111 are arranged between the tuyere 12 and the outlet 13 . The plurality of measuring devices 111 are arranged in a line in the vertical direction, and the induced electromotive force can be measured at different heights. Therefore, the measuring device 111 can measure the height of the molten metal S from the upper side of the outlet 13 to the lower side of the tuyeres 12. The height of the bath surface of the molten iron S on the outlet 13 can be measured and it can be monitored whether the amount of the molten iron S in the blast furnace 11 reaches the height of the tuyeres 12. [

At this time, since the position of the measuring instrument 111 is fixed, the distance between the bottom surface of the blast furnace 11 and the lowermost measuring instrument 111 can be known in advance. The height value measured using the measuring device 111 is a height value starting from the upper side of the exit 13. Therefore, when the distance value between the lowermost measuring instrument 111 and the bottom surface is added to the measured height value, the height of the hot surface of the molten iron S from the bottom surface of the blast furnace 11 can be measured.

In addition, the number of measuring instruments 111 provided can be adjusted as needed. For example, if the number of the measuring devices 111 is increased and the interval between the measuring devices 111 is narrow, the position where the induced electromotive force is measured is increased, and the height of the bath surface of the hot wire S can be more accurately calculated. Accordingly, it is possible to adjust or improve the measurement accuracy by adjusting the interval between the measuring devices 111.

The blast furnace 11 may be provided with a plurality of outlets 13 and the measuring unit 110 may include a plurality of measuring devices 111 provided for each of the plurality of outlets 13. [ The outlets 13 may all be located at the same height.

The processing unit 120 serves to determine the height of the molten iron S of the molten iron S using the values measured by the measuring unit 110. The processing unit 120 includes a processor 122 that finds the maximum value of the induced electromotive force values measured for each height and selects the height of the measured value as the measured height of the molten metal. The processing unit 120 may include an amplifier 121 capable of amplifying measured values measured by the measuring unit 110 and an indicator 123 indicating the result calculated by the processor 122 to the operator .

The amplifier 121 is connected to the measuring device 111. The amplifier 121 can amplify the induced electromotive force value measured by the measuring devices 111. Since the magnitude of the induced electromotive force input from the measuring device 111 is small, the measured induced electromotive force can be amplified by the amplifier 121 and output. Thus, all of the induced electromotive forces input from the measuring devices 111 can be amplified and output to the processor 122. [

In addition, noise may be removed from the amplifier 121 to improve the calculation accuracy of the processor 122. [ That is, the function of the low-pass filter may be added to the amplifier 121. [ The bath surface of the molten iron S can move for reasons other than horizontal movement. For example, the measuring instrument 110 provided on the upper side of the first outlet 13 may measure the induced electromotive force generated when the hot surface of the molten iron S moves while the other outlet 13 is opened or closed. Thus, it is possible to prevent the processor 122 from calculating the bath surface height of the hot wire S with a wrong value by removing the noise.

The processor 122 is connected to the amplifier 121. The processor 122 can determine the bath surface height of the hot wire S in the blast furnace 11 by using the induced electromotive force measured values amplified by the amplifier 121. [ In the processor 122, the measured values of induced electromotive force according to the height are compared, and the height at which the largest induced electromotive force is measured can be selected. Thus, the processor 122 can determine that the selected height is the bath surface height of the molten iron S.

The indicator 123 is connected to the processor 122. The display 123 can display the bath surface height of the molten iron S calculated by the processor 122. [ For example, the indicator 123 can be a display, and can display the bath surface elevation of the chartered line S in a visual manner in a visual manner. However, the method by which the indicator 123 informs the operator of the height of the bath surface is not limited to this, and may vary.

The control unit 130 is connected to the processing unit 120 to control the opening and closing of the outlet 13. The controller 130 includes a comparator (not shown) for comparing a height value at which the maximum induced electromotive force is measured with a predetermined set height range, and a controller for controlling the time when the height of the outlet 13 is opened And a controller (not shown).

The comparator is coupled to the processor 122. The comparator can compare the value of the bath surface height of the determined molten iron S with a predetermined set height range. The set height range can be varied by the operator. The comparator determines that the predetermined value of the bath surface height of the molten iron S is within the set range, and determines that the molten steel is defective if the set range is exceeded.

It is possible to judge that too much molten iron S is stored in the blast furnace 11 if the determined value of the bath surface height of the molten iron S is larger than the set range, It can be judged that the amount is too small. Therefore, it can be judged that a sufficient amount of charcoal in the blast furnace 11 has not been stored.

At this time, the comparator may be connected to the indicator 123. If the amount of the charcoal S in the blast furnace 11 in the comparator is too small or too large, a warning signal can be sent to the operator. Therefore, the operator can monitor whether the amount of the charcoal S in the blast furnace 11 is an appropriate amount.

The controller is connected to the comparator. The controller can adjust the time at which the outlet (13) is opened according to the judgment result of the comparator. Alternatively, the time at which the plurality of outlets 13 are opened can be adjusted, and the time at which the plurality of outlets 13 are opened can be overlapped, . Therefore, the controller can adjust the bath surface height of the charcoal S stored in the blast furnace 11 to be within the set range.

For example, if the value of the bath surface height of the calculated molten iron S is larger than the set range, the amount of molten steel leaving the outlet 13 can be increased. That is, it is possible to increase the time when the plurality of outlets 13 are opened together. As a result, the amount of the charcoal S discharged from the blast furnace 11 increases and the amount of the charcoal S stored in the furnace 11 increases. Can be greatly reduced. Therefore, the bath surface height of the molten iron S in the blast furnace 11 can be lowered.

Conversely, if the calculated value of the bath surface height of the molten iron S is smaller than the set range, the amount of molten iron leaving the outlet 13 can be reduced. That is, it is possible to reduce the time when the plurality of outlets 13 are opened together. As a result, the amount of the charcoal S discharged from the blast furnace 11 decreases and the amount of the charcoal S stored in the blast furnace 11 decreases The amount can be reduced to a small extent. Therefore, the height of the bath surface of the hot wire S in the blast furnace 11 can be suppressed from being lowered.

Thus, when stopping the discharge of the charcoal stored in the blast furnace 11, the induced electromotive force due to the horizontal behavior of the charcoal S can be measured for each height. Thus, it is possible to accurately measure the bath surface height of the molten iron S by using the measured induced electromotive force.

In addition, since the height of the bath surface of the molten iron S can be accurately measured, the amount of the molten iron S to be discharged can be determined so that the molten iron S is stored in the blast furnace 11 in an appropriate amount. Therefore, it is possible to stably carry out the work for leaving the charcoal line S, and to appropriately maintain the amount of the charcoal line S in the blast furnace 11. [ Therefore, it is possible to suppress or prevent the increase of the blowing pressure in the blast furnace 11, the occurrence of the drift, or the reverse flow of the molten iron S to the tuyeres 12. [

FIG. 4 is a flow chart showing a method for measuring a bath surface height according to an embodiment of the present invention, FIG. 5 is a view showing an exit schedule of a plurality of outlets according to an embodiment of the present invention, and FIG. FIG. 5 is a graph showing the measurement results of the induced electromotive force measured by the height according to the height. FIG.

Referring to FIG. 4, the method for measuring the bath surface height according to the embodiment of the present invention includes a process of opening an outlet provided in a container (S100), a process of discharging molten metal in the container (S200) (S400) of measuring the induction electromotive force generated by the movement of the molten metal by height (S400), and deriving the height of the molten metal bath surface using the measured values (S500).

At this time, the vessel may be a blast furnace or a FINEX melting furnace, and the molten metal may be a molten iron. Therefore, the method for measuring the bath surface height may be a method for calculating the bath surface height of the molten iron wire accommodated in the blast furnace. In addition, the process of closing the outlet and measuring the induced electromotive force generated by the movement of the molten metal by height may be performed simultaneously or sequentially.

For example, when the molten iron S is discharged from the blast furnace 11, only the molten iron S close to the outlet 13 is discharged through the outlet 13 due to the viscosity of the molten iron S and the influence of the surface tension , And the chartered line S in the other area can not smoothly move to the outlet 13. Therefore, the height of the bath surface of the molten iron S on the outlet 13 can be relatively lower than the bath surface height of the molten iron S in the other area.

When the outlet 13 is closed, the molten iron S on the upper part of the outlet 13, which was temporarily lowered during the leaving period due to the nature of the molten iron S in the blast furnace 11, is horizontally restored to the upper side, The height of the molten iron S can be made equal. It is possible to measure the bath surface height of the molten iron S by measuring the induced electromotive force generated by the movement of the molten iron S. [

That is, the maximum value of the induced electromotive force measured by height can be found. For example, the maximum value can be selected by comparing the induced electromotive force values measured by height. Then, the height at which the maximum value is measured can be selected as the bath surface height of the molten iron S. Since the hot wire S has a horizontal behavior from the lower side to the upper side, the induced electromotive force is sequentially measured from the lower side to the upper side.

At this time, the blast furnace 11 may be provided with a plurality of outlets 13. A plurality of measuring devices 110 may be installed at the upper portion of each outlet 13. Before measuring the induced electromotive force with the measuring devices 111, the degree of the exit schedule may be provided. That is, information on when the plurality of outlets 13 are opened and closed can be provided. Accordingly, it is also possible to select a time point at which the measuring unit 110 measures the induced electromotive force in accordance with the schedule of the respective outlets 13.

For example, two or four outlets 13 may be provided in the blast furnace 11 as shown in FIG. When the one outlet 13 is opened and closed, the other outlet 13 is opened to determine the height of the hot surface of the hot wire S by using the induced electromotive force on the side of the hot water outlet 13, . Therefore, the height of the bath surface of the molten iron S can be constantly determined while performing the operation of leaving the molten iron S to the plurality of outlets 13. [

When there are two outlets 13, the blast furnace 11 may be provided with the first outlets 13 and 13a and the second outlets 13b. The first outlet 13a and the second outlet 13b can be alternately opened and closed and the chartered line S can be taken out. The electromotive force can be measured by the measuring unit 110 disposed above the first outlet 13a after the first outlet 13a is opened to leave the hot wire and the first outlet 13 closed.

The second outlet 13b is opened to determine the height of the bath surface of the molten iron S using the values measured by the measuring unit 110 disposed on the upper side of the first outlet 13a, Can be performed continuously. At this time, the first outlet 13a may be opened before the second outlet 13b is closed, and the first outlet 13a and the second outlet 13b may be opened together.

Therefore, the time at which the first outlet 13a and the second outlet 13b are opened can be overlapped, and if the overlap time is increased, the amount of the molten metal S in the blast furnace 11 can be reduced to a large extent And the amount of the molten metal S in the blast furnace 11 can be reduced to a small extent by reducing the overlapping time. Accordingly, if it is determined that the height of the molten metal S calculated by opening and closing the first outlet 13a is high, the second outlet 13 can be opened further in addition to the original opening time so that the Lap can be taken out. The time for which the first outlet 13a and the second outlet 13b are opened together can be increased to increase the amount of the charcoal discharge.

When the second outlet 13b is closed, the induction electromotive force can be measured by the measuring unit 110 positioned above the second outlet 13b, and the measuring unit 110 disposed above the second outlet 13b , It is possible to continue the work of leaving the molten iron S at the first outlet 13a while determining the bath surface height of the molten iron S by using the measured values.

The second outlet 13b may be opened before the first outlet 13a is closed and the first outlet 13a and the second outlet 13b may be opened together. The amount of stored charcoal in the blast furnace 11 can be adjusted by adjusting the time at which the first outlet 13a and the second outlet 13b are opened together according to the second predetermined value. Therefore, the work for leaving the charter line S and the work for determining the height of the bath surface of the charter line S can be continuously performed.

On the other hand, when there are four outlets 13, the blast furnace 11 may be provided with a first outlet 13a, a second outlet 13b, a third outlet 13c, and a fourth outlet 13d. When the maintenance work is performed on the fourth outlet 13d, the charter S can be taken out while sequentially opening and closing the first outlet 13a, the second outlet 13b, and the third outlet 13c. Thus, after the first outlet 13a is opened and closed, the induced electromotive force can be measured by the measuring unit 110 disposed above the first outlet 13a.

The second outlet 13b is opened while calculating the measured values by the measuring unit 110 disposed on the upper side of the first outlet 13a to determine the bath surface height of the hot wire S, Can be performed continuously. At this time, the first outlet 13a may be opened before the second outlet 13b is closed, and the first outlet 13a and the second outlet 13b may be opened together.

Therefore, the time at which the first outlet 13a and the second outlet 13b are opened can overlap, and if the overlap time is increased, the amount of the molten metal S in the blast furnace 11 is greatly reduced, The amount of the molten metal S in the blast furnace 11 can be reduced to a small extent by reducing the overlapping time. If it is determined that the height of the molten iron S of the molten iron S is high while opening and closing the first outlet 13a for the first time, the time for which the first outlet 13a and the second outlet 13b are opened together is increased, Can be increased.

When the second outlet 13b is closed, the induction electromotive force can be measured by the measuring unit 110 positioned above the second outlet 13b, and the measuring unit 110 disposed above the second outlet 13b , It is possible to continue the work of leaving the molten iron S at the third outlet 13c while determining the bath surface height of the molten iron S by using the measured values.

The first outlet 13b can be opened before the third outlet 13a is closed and the first outlet 13a and the third outlet 13c can be opened together. The amount of stored charcoal in the blast furnace 11 can be adjusted by controlling the time at which the first outlet 13a and the third outlet 13b are opened together according to the second predetermined value. Therefore, the work for leaving the charter line S and the work for determining the height of the bath surface of the charter line S can be continuously performed. However, the number of the openings 13 and the order in which the openings 13 are opened and closed are not limited to these and may vary.

On the other hand, when a plurality of outlets 13 are provided, the induced electromotive force can be measured for each of the plurality of outlets. One outlet 13 can be determined using the induced electromotive force measured for each of the plurality of outlets, and the maximum value can be found at the determined exit 13.

For example, when any one of the plurality of outlets 13 is opened and closed so that the molten iron S moves horizontally, not only the meters 111 on the upper side of the open outlet 13 but also the upper side of the other outlet 13 The measuring devices 111 positioned can also measure the induced electromotive force. Thus, the induced electromotive force can be measured at a plurality of positions. However, the induced electromotive force measured at the outlet 13 of the plurality of outlets 13 may be larger than the induced electromotive force measured at other positions. Therefore, the induced electromotive force measured at other positions can be treated as noise, and the maximum value of the flow electromotive force values measured at the upper side of the opening 13 to be opened and closed can be found to determine the bath surface height of the molten iron S.

Alternatively, when a plurality of outlets 13 are provided, the induced electromotive force can be measured at the outlets 13 which are opened or closed among the plurality of outlets 13. [ That is, the electromotive force is measured only by the measuring devices 111 located above the outlet 13 to be opened and closed, and the measured electromotive force is not measured by the measuring devices 111 located above the other outlet 13. Thus, it is possible to accurately measure the bath surface height of the molten iron S at a desired position. Therefore, it is possible to prevent the measured value of the bath surface from being measured because the measured values at a plurality of positions are processed at a time.

When the bath surface height of the molten iron S is determined, the predetermined height value can be compared with a predetermined set height range. The amount of molten metal discharged can be adjusted if the determined height value is outside the set height range. That is, the time at which the outlet 13 is opened can be adjusted in order to adjust the amount of the molten iron S in the discharged blast furnace 11. [

For example, increasing the time that each outlet 13 is open can increase the amount of charcoal S discharged in the blast furnace 11, and reducing the time that each outlet 13 is opened, The amount of the charcoal S discharged from the charger 11 can be reduced. Thus, the height of the bath surface of the molten iron S in the blast furnace 11 can be appropriately adjusted.

Alternatively, the plurality of outlets 13 may be overlapped with each other, and the time during which the plurality of outlets 13 are opened together may be adjusted. Accordingly, when the time for which the plurality of outlets 13 are opened together increases, the amount of the molten iron S discharged in the blast furnace 11 increases, and the height of the molten iron S of the molten iron S can be greatly reduced. The amount of the molten iron S discharged in the blast furnace 11 decreases, and the height of the molten iron S of the molten iron S can be reduced to a small width as the time for opening the plurality of outlets 13 decreases.

Thus, when stopping the discharge of the charcoal stored in the blast furnace 11, the induced electromotive force due to the horizontal behavior of the charcoal S can be measured for each height. Thus, it is possible to accurately measure the bath surface height of the molten iron S by using the measured induced electromotive force.

In addition, since the height of the bath surface of the molten iron S can be accurately measured, the amount of the molten iron S to be discharged can be determined so that the molten iron S is stored in the blast furnace 11 in an appropriate amount. Therefore, it is possible to stably carry out the work for leaving the charcoal line S, and to appropriately maintain the amount of the charcoal line S in the blast furnace 11. [ Therefore, it is possible to suppress or prevent the increase of the blowing pressure in the blast furnace 11, the occurrence of the drift, or the reverse flow of the molten iron S to the tuyeres 12. [

Although the present invention has been described in detail with reference to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims, as well as the appended claims.

11: Blast Furnace 12: Fog
13: Exit 100: Measuring device for bath surface height
110: measuring part 111: measuring instrument
120: Processor 121: Amplifier
122: processor 123: indicator
130: Control S: Charter

Claims (18)

An apparatus for measuring the height of a bath surface of a molten metal contained in a container provided with an outlet,
The induction electromotive force generated due to the movement of the molten metal toward the upper side due to the property that the portion of the molten metal lowered in height from the lower portion of the molten metal is horizontal with respect to the other portion, A measuring unit installed in the housing;
And a processing unit having a low pass filter for determining the height of the melt surface of the molten metal using the measured values for each height and for removing noise. The method according to claim 1,
Wherein the measuring section includes a plurality of measuring devices arranged in a vertical direction. The method of claim 2,
A tuyeres to which hot air can be supplied are formed in the container,
Wherein the plurality of measuring instruments are disposed between the outlet and the tuyere. The method according to claim 1,
Wherein a plurality of the outlets are provided,
Wherein the measuring unit includes a plurality of measuring devices installed for each of the plurality of outlets. The method according to claim 1,
Wherein,
And a processor for finding a maximum value of the induced electromotive force values measured for each of the heights and selecting the height of the molten metal as the measured height of the molten metal. The method of claim 5,
And a control unit connected to the processing unit to control opening and closing of the outlet. The method of claim 6,
Wherein,
A comparator for comparing the measured height value of the maximum induced electromotive force with a predetermined set height range; And
And a controller for controlling the time when the outlet is opened when the height value is out of the preset height range. The method of claim 7,
Wherein a plurality of the outlets are provided,
Wherein the controller is capable of adjusting the time at which the plurality of outlets are opened together. A method for measuring the height of a molten metal bath surface inside a container,
Opening an outlet provided in the container;
Discharging molten metal in the container;
Closing the outlet;
Measuring an induction electromotive force generated due to movement of the upper portion of the molten metal lowering the height of the molten metal due to the horizontal nature of the molten metal, And
And removing noise from the measured values and deriving the height of the molten metal bath surface using the noise-removed values. The method of claim 9,
In the process of deriving the molten metal bath surface height,
Finding the maximum value of the induced electromotive force measured by height; And
And selecting the height of the molten metal as the measured height of the maximum induction electromotive force. The method of claim 10,
Wherein a plurality of the outlets are provided,
Wherein the step of measuring the induced electromotive force by height includes the step of measuring an induced electromotive force for each of a plurality of outlets. The method of claim 11,
The step of finding the maximum value of the induced electromotive force,
Determining one outlet using the induced electromotive force measured for each of the plurality of outlets, and finding the maximum value at the determined outlet. The method of claim 10,
Wherein a plurality of the outlets are provided,
Wherein the step of measuring the induced electromotive force by height includes the step of measuring an induced electromotive force at an outlet that is opened or closed among the plurality of outlets. The method according to any one of claims 11 to 13,
After the height of the molten metal bath surface is derived,
Comparing the derived height value with a preset height range; And
And adjusting the amount of molten metal discharged when the derived height value is out of the set height range. 15. The method of claim 14,
Wherein the step of controlling the amount of the molten metal to be discharged includes the step of adjusting the opening time of the outlet. 16. The method of claim 15,
The plurality of outlets may overlap with each other at a time when they are opened,
Wherein the step of adjusting the time for opening the outlet includes adjusting at least one of a time when each outlet is opened and a time when the plurality of outlets are opened together. The method according to any one of claims 9 to 13,
Wherein the step of measuring the induction electromotive force by height includes the step of sequentially measuring the induction electromotive force from the lower side to the upper side. The method according to any one of claims 9 to 13,
Wherein the vessel includes a blast furnace or a FINEX melting furnace, and the molten metal comprises a molten iron.

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