JP2019026883A - Device for measuring molten slag amount and method for measuring molten slag amount - Google Patents

Abstract

To provide a device for measuring a molten slag amount which, in addition to a function to measure the molten slag amount contained in a tapping slag flow on the basis of an image of the tapping slag flow flowing out of a taphole, has a function to determine whether accumulation grows in the vicinity of a lower part of the taphole.SOLUTION: A device for measuring molten slag amount 1 includes an acquiring unit 51, a calculating unit 52, and a determining unit 53. The acquiring unit 51 acquires a plurality of images of a tapping slag flow 30 in the vicinity of a taphole 11 captured over a plurality of time points. The calculating unit 52 calculates a speed and a width of the tapping slag flow 30 on the basis of the plurality of the images, and calculates an amount of molten slag 32 flowing out of the taphole 11 by using a predetermined equation including the speed and the width as variables. The determining unit 53 determines whether the accumulation grows in the vicinity of a lower portion 11a of the taphole 11 on the basis of images of a lower portion 30a of the tapping slag flow 30 which are captured in the plurality of the images.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for measuring the amount of hot metal contained in a tap flow taken out from a tap port.

  An example of a vertical furnace is a blast furnace. In the blast furnace, there is a high-temperature melt containing hot metal (molten iron) and hot metal (molten slag). The high-temperature melt taken out from the blast furnace outlet is called the outgoing stream. The molten iron stream flows through the molten iron, where it is separated into molten iron and molten iron, and the molten iron is transferred to a topped car and sent to the next step. The hot metal is sent to the granulation facility and made into granulated slag. Granulated slag is reused as a raw material for cement.

  If the amount of the high-temperature melt in the blast furnace is too large, the furnace condition will be deteriorated and the operation of the blast furnace will be hindered. For this reason, management of the quantity of the high temperature melt in a blast furnace is important. Knowing the amount of hot metal and hot metal contained in the slag, the amount of high-temperature melt in the blast furnace can be determined. The amount of hot metal contained in the molten iron stream can be accurately determined by using the weight of the topped car containing hot metal and the weight of the topped car containing no hot metal.

  The amount of hot metal contained in the tidal stream can be determined from the granulated slag, but is not reliable. Therefore, Patent Document 1 obtains the speed and width of the molten iron flow by image processing, and uses a predetermined expression including the speed and width as variables to accurately calculate the amount of molten iron contained in the molten iron flow. The technique to measure is disclosed. The width of the output stream is the size of the output stream in the direction crossing the direction in which the output stream flows, in other words, the diameter of the cross section of the output stream perpendicular to the flow direction. It is.

Japanese Patent Laid-Open No. 2006-6221

  Since the tidal stream is taken out from the tidal outlet, the deposit tends to grow near the lower part of the tidal outlet. This deposit is considered to contain at least one of slag and iron. The technique disclosed in Patent Document 1 calculates the width of the output flow using an image of the output flow in the vicinity of the output port (in other words, the output flow immediately after exiting the output port). To do. When the deposit grows near the lower part of the tap, the lower part of the tap near the tap is covered with the deposit and appears in the image in this state. Since the tidal stream and the deposit look the same, it is difficult to distinguish the lower part of the tidal stream from the deposit. For this reason, when the deposit is growing near the lower part of the tap outlet, the width of the tap flow cannot be calculated accurately, and as a result, the amount of hot metal contained in the tap flow is measured. Accuracy will be reduced.

  The object of the present invention is to add a function of measuring the amount of hot metal contained in the tap stream based on the image of the tap stream taken out from the tap port, It is to provide a hot metal amount measuring apparatus and a hot metal amount measuring method having a function of determining whether or not deposits are growing in the vicinity.

  The hot metal amount measuring apparatus according to the first aspect of the present invention includes an acquisition unit that acquires a plurality of images obtained by imaging a tap flow near a tap outlet of a vertical furnace at a plurality of times. Based on the plurality of images acquired by the acquisition unit, the speed and width of the tapping flow are calculated, and are extracted from the tapping outlet using a predetermined formula including the speed and the width as variables. A calculation unit for calculating the amount of the molten iron, and a lower side of the tap hole based on images of a lower part of the tap flow that are copied to a plurality of images acquired by the acquisition unit A determination unit that determines whether or not deposits are growing near the portion.

  The hot metal amount measuring apparatus according to the first aspect of the present invention is a hot metal flow in the vicinity of the tap outlet of the vertical furnace (an output flow that is discharged from the tap outlet of the vertical furnace and flows in the vicinity of the tap outlet). ) Is calculated on the basis of a plurality of images obtained at a plurality of times, and the speed and width of the output flow are calculated, and a predetermined expression including the speed and width as variables is used to calculate the output speed. Calculate the amount of hot metal removed from the mouth. This can be realized by, for example, the technique disclosed in Patent Document 1.

  The width of the output stream is the size of the output stream in the direction intersecting the direction in which the output stream flows. The plurality of images used for calculating the speed and width of the outflow and the plurality of images used for determining the growth of the deposit may be the same or different.

  The present inventor determines whether or not deposits are growing near the lower part of the taphole based on the images of the lower part of the tapping stream, which are copied in the plurality of images. I found out that I can do it. This will be described in detail. The image of the lower part of the output stream is, in other words, the lower end of the output stream image. For example, the image is located below the center of the output stream and borders with the background. It is an image including The inventor has found that for a short time interval (eg, less than 1/100 second), the shape of the lower part of the tidal stream changes, but the shape of the deposit does not change (another Using the expression, the lower part of the tidal stream moves, but the sediment does not move). This seems to be due to the following reasons. The shape of the lower part of the output flow is constantly changing because the output flow near the output port is released from the output port into the space. For this reason, the shape of the lower part of the tidal stream changes even at short time intervals. In contrast, the deposit is a solid, and as the deposit grows, the shape of the deposit changes, but for a short time interval, the shape of the deposit changes little (or does not change).

  Therefore, when the change in the shape of the image of the lower part of the tidal current is relatively large at the predetermined time interval, the lower part of the tidal current near the outlet is not covered with deposits. Can be considered. Therefore, the determination unit determines that the deposit has not grown near the lower portion of the taphole. On the other hand, when the change in the shape of the image of the lower part of the tidal current is relatively small at a predetermined time interval, the lower part of the tidal current near the outlet is covered with deposits. It can be considered that it is in a state. Therefore, the determination unit determines that the deposit is growing near the lower portion of the taphole.

  As described above, according to the hot metal amount measuring apparatus according to the first aspect of the present invention, the hot metal contained in the hot metal flow is based on the image of the hot metal flow taken out from the hot metal outlet. In addition to the function of measuring the amount of slag, it has a function of determining whether or not deposits are growing near the lower portion of the taphole.

Here, an example of how to calculate the amount of hot metal taken out from the spout (hot metal amount M _s ) will be described. The calculation unit calculates the amount of molten iron (molten metal amount m _s ) taken out from the spout opening per unit time using the equation (1).

Hot metal amount m _f, for example, based on the weight of Topidoka that does not have the weight and the hot metal Topidoka containing the hot metal can be obtained. The radius r of the output stream is the radius of the cross section of the output stream perpendicular to the flow direction of the output stream and is half the width of the output stream. The correction coefficient k is, for example, 0 ≦ k ≦ 1.

Calculation unit, by time integration of溶滓amount m _s, and calculates the溶滓amount M _s.

  In the above-described configuration, the determination unit obtains an index value that increases as the change in the shape of the image increases and decreases as the change in the shape of the image decreases during the predetermined time interval. When the index value exceeds a predetermined threshold value, it is considered that the change in the shape of the image is relatively large, and the deposition is near the lower portion of the tap hole. When it is determined that an object has not grown and the index value is less than or equal to the threshold value, it is considered that the change in the shape of the image is relatively small, and the deposit grows near the lower portion of the taphole It is determined that

  This configuration defines an example of how to determine whether or not deposits are growing near the lower portion of the taphole. The index value increases as the change in the shape of the lower portion of the output flow increases at a predetermined time interval, and decreases as the change in the shape of the image decreases. Therefore, if the index value is used, it can be determined whether or not the deposit is growing near the lower portion of the taphole. A second index value indicating a change opposite to the index value may be used. The second index value becomes smaller as the change in the shape of the lower part of the output flow increases at a predetermined time interval, and becomes larger as the change in the shape of the image becomes smaller. When the second index value is equal to or less than a predetermined threshold, the determination unit determines that the deposit is not growing near the lower portion of the taphole, and the second index value is When the threshold is exceeded, it is determined that the deposit is growing near the lower portion of the tap.

  The said structure WHEREIN: When the said determination part determines with the said deposit growing near the lower part of the said tap hole, it further has an alerting | reporting part which performs predetermined alert | report.

  According to this configuration, it is possible to notify the user of the hot metal amount measuring device that the deposit is growing near the lower portion of the tap hole.

  The hot metal amount measuring method according to the second aspect of the present invention is a first step of acquiring a plurality of images obtained by imaging a hot metal flow near a hot metal outlet at a plurality of times. And calculating the speed and width of the tidal flow based on the plurality of images acquired in the first step, and using the predetermined formula including the speed and the width as variables, A second step of calculating the amount of hot metal taken out from the base, and an image of the lower part of the outgoing flow that is copied to the plurality of images obtained in the first step. And a third step for determining whether deposits are growing near the lower portion of the mouth.

  The hot metal amount measuring method according to the second aspect of the present invention defines the hot metal amount measuring device according to the first aspect of the present invention from the viewpoint of the method, and the hot metal amount measuring according to the first aspect of the present invention. It has the same effect as the device.

  According to the present invention, in addition to the function of measuring the amount of hot metal contained in the tap stream based on the image of the tap stream taken out from the tap port, the lower part of the tap port It is possible to provide a hot metal amount measuring apparatus and a hot metal amount measuring method having a function of determining whether or not deposits are growing in the vicinity.

It is explanatory drawing explaining the process of the tap flow taken out from the tap outlet of the blast furnace. It is a block diagram which shows the structure of the hot metal amount measuring apparatus which concerns on embodiment. It is an image figure of the 1st image which shows the example of the image imaged previously among two continuous images. It is an image figure of the 1st image which shows the example of the image imaged later among two continuous images. It is an image figure which shows the 1st image in which the 3rd region of interest was set. It is an image figure which shows the 1st image in which the 3rd region of interest was set. It is explanatory drawing explaining the image process with respect to the image cut out from the 1st image imaged in the state in which the deposit has not grown. It is an image figure of the 1st image which shows the example of the image imaged first among two consecutive images imaged in the state where the deposit is growing near the lower part of the taphole. It is an image figure of the 1st picture which shows the example of the image picturized later among two consecutive pictures picturized in the state where the deposit is growing near the lower part of the tap mouth. It is explanatory drawing explaining the image process with respect to the image cut out from the 1st image imaged in the state in which the deposit is growing. It is a flowchart explaining the operation | movement which the hot metal amount measuring apparatus which concerns on embodiment determines whether the deposit is growing near the lower part of the spout opening.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the structure which attached | subjected the same code | symbol shows that it is the same structure, The description is abbreviate | omitted about the content which has already demonstrated the structure.

  In the embodiment, a blast furnace will be described as an example of a vertical furnace. FIG. 1 is an explanatory view for explaining the processing of the tap stream 30 taken out from the tap port 11 of the blast furnace 10. An end portion 20 a of the barbed 20 is located below the barb 11. The output stream 30 taken out from the output port 11 (the output flow 30 discharged from the output port 11) falls to a predetermined location of the output 20 and flows through the output 20. At this predetermined location, an output cover 21 that covers the output 20 is disposed. The brewing cover 21 prevents the brewing flow 30 that has fallen to a predetermined location from being scattered outside. The molten iron stream 30 flowing through the molten iron 20 is separated into a molten iron 31 and a molten iron 32. The hot metal 31 is sent to the topped car. The hot metal 32 is sent to the granulation facility.

  The space until the output flow 30 taken out from the output port 11 reaches the output 20 from the output port 11 is set as the imaging range of the output flow 30. Although the spout 11 is included in the imaging range, the spout 11 may not be included. The lower portion 30 a of the tapping stream 30 passes through the vicinity of the lower portion 11 a of the tapping port 11.

  FIG. 2 is a block diagram showing a configuration of the hot metal amount measuring apparatus 1 according to the embodiment. The molten iron amount measuring apparatus 1 includes an imaging unit 3, a control processing unit 5, a display unit 7, and an input unit 9. Among these, the control processing unit 5, the display unit 7, and the input unit 9 are arranged in an operator room (not shown).

  The imaging unit 3 includes a band-pass filter that transmits light having a wavelength greater than or equal to the red wavelength or greater than or equal to the near-infrared wavelength. The moving image V of the output stream 30) in the vicinity of the shed 11 is captured and sent to the control processing unit 5. As described above, the imaging unit 3 captures a plurality of images obtained by imaging the tap stream 30 near the tap port 11 of the blast furnace 10 at a plurality of times, and sends the images to the control processing unit 5. . The imaging unit 3 is a camera including a CCD image sensor or a CMOS image sensor, for example.

  The control processing unit 5 includes an acquisition unit 51, a calculation unit 52, a determination unit 53, and a display control unit 54 as functional blocks. The control processing unit 5 executes the functions of a communication interface, CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), HDD (Hard Disk Drive), and the above functional blocks. This is realized by a program, data, and the like.

  With reference to FIGS. 1 and 2, the acquisition unit 51 receives the moving image V sent from the imaging unit 3 to the control processing unit 5. As described above, the acquisition unit 51 acquires a plurality of images obtained by photographing the tap stream 30 near the tap port 11 of the blast furnace 10 at a plurality of times.

  The calculation unit 52 calculates the speed and width of the output flow 30 based on the plurality of images acquired by the acquisition unit 51, and uses the predetermined expression including the speed and width as variables, and uses the output port 11. The amount of the hot metal 32 taken out from is calculated. The calculation unit 52 will be described in detail. The calculation unit 52 extracts two consecutive images (frames) from the moving image V received by the acquisition unit 51. FIG. 3 is an image diagram of the first image Im1-a showing an example of an image captured first of two consecutive images. FIG. 4 is an image diagram of the first image Im1-b showing an example of an image captured later among two consecutive images. In the first images Im1-a and Im1-b, the x direction indicates the horizontal direction, and the y direction indicates the vertical direction. The y direction is defined as the width direction of the outgoing flow 30. In the first images Im1-a and Im1-b, an image of the output flow 30 (hereinafter, output flow image 300) is copied. As described above, the imaging range of the tap stream 30 is a space from when the tap stream 30 taken out from the tap port 11 reaches the tap bar 20 from the tap port 11.

  Referring to FIG. 3, calculation unit 52 sets first region of interest ROI1 for obtaining the width of outgoing flow 30 in image Im1-a. The size of the first region of interest ROI1 is, for example, 40 pixels in the x direction and 240 pixels in the y direction. The calculation unit 52 binarizes the pixel value of the pixel of the first region of interest ROI1. For example, binarization processing is performed by discriminant analysis.

  The pixel value of the pixel of the first region of interest ROI1 that has been binarized is two-dimensional data. The calculation unit 52 converts the two-dimensional data into one-dimensional data by performing projection processing in the y direction. The projection process is a process of obtaining an average value of pixel values of pixels having the same y coordinate in the two-dimensional data (not an average, for example, addition may be performed). The calculation unit 52 uses the one-dimensional data and a predetermined threshold (for example, 0.5) to calculate two y coordinates y1 and y2 that define the width of the output flow image 300 (y1). <Y2). The difference between the y-coordinate y1 and the y-coordinate y2 is the width of the outgoing flow image 300, and the calculation unit 52 calculates the width of the outgoing flow 30 based on this difference.

  The calculation unit 52 sets the second region of interest ROI2 in the outgoing flow image 300 copied to the first image Im1-a. The second region of interest ROI2 is set within the first region of interest ROI1, but may be set outside the first region of interest ROI1. Since the outgoing flow 30 is flowing, the image in the second region of interest ROI2 moves in the direction in which the outgoing flow 30 is flowing. The calculation unit 52 specifies the position on the outgoing flow image 300 that is captured in the first image Im1-b illustrated in FIG. 4 for the image in the second region of interest ROI2. This can be realized by pattern matching, for example. The calculation unit 52 calculates the movement amount of the image in the second region of interest ROI2 in the first image Im1-a and the first image Im1-b, and based on this, the speed of the output flow 30 is calculated. calculate. In order to calculate the speed of the output stream 30, the frame rate of the moving image V imaged by the imaging unit 3 is preferably 100 fps or more (for example, 180 fps).

  The image used for calculating the width of the output stream 30 is the first image Im1-a used for calculating the speed of the output stream 30, and is used for calculating the speed of the output stream 30. The obtained first image Im1-b may be used, or an image other than these first images may be used.

With reference to FIG. 1 and FIG. 2, the calculation part 52 calculates the quantity (molten metal quantity m _s ) of the hot metal 32 taken out from the hot metal outlet 11 per unit time using the formula (1). .

The radius r of the output stream 30 is a radius of the cross section of the output stream 30 where the output stream 30 is perpendicular to the flow direction, and is half the width of the output stream 30. Hot metal amount m _f, for example, based on the weight of Topidoka weight and the hot metal 31 of Topidoka the hot metal 31 is contained is not turned can be obtained. The correction coefficient k is, for example, 0 ≦ k ≦ 1.

Calculation unit 52 by time integrating the溶滓amount m _s, and calculates the溶滓amount M _s retrieved from Dezukuguchi 11.

  Based on the image of the lower portion 30a of the tap stream 30 that is shown in the moving image V, the inventor has determined whether or not the deposit is growing near the lower portion 11a of the tap port 11. It was found that can be determined. More specifically, the present inventor shows that the shape of the lower portion 30a of the output flow 30 changes but the shape of the deposit does not change in a short time interval (for example, 1/100 second or less). (If another expression is used, the lower part 30a of the output stream 30 moves, but the deposit does not move). This seems to be due to the following reasons. Since the output stream 30 near the output port 11 is in a state of being discharged from the output port 11 into the space, the shape of the lower portion 30a of the output port 30 is constantly changing. For this reason, even if it is a short time interval, the shape of the lower part 30a of the tidal stream 30 is changing. In contrast, the deposit is a solid, and as the deposit grows, the shape of the deposit changes, but for a short time interval, the shape of the deposit changes little (or does not change).

  The determination unit 53 is based on the images of the lower portion 30a of the output flow 30 that are copied to the plurality of images acquired by the acquisition unit 51 (the moving image V received by the acquisition unit 51). It is determined whether or not deposits are growing near the lower portion 11a. Specifically, when the change in the shape of the image of the lower portion 30a of the tap stream 30 is relatively large at a predetermined time interval, the determination unit 53 determines that deposits are present near the lower portion 11a of the tap port 11. It is determined that it has not grown, and it is determined that the deposit has grown in the vicinity of the lower portion 11a of the spout 11 when the change in the shape of the image is relatively small at a predetermined time interval.

  The determination unit 53 will be described in detail. The determination unit 53 extracts two consecutive images (frames) from the moving image V received by the acquisition unit 51. The two consecutive images may be two images used for calculating the velocity of the output flow 30 or may be two other images. In the embodiment, the former (that is, the first image Im1-a shown in FIG. 3 and the first image Im1-b shown in FIG. 4) will be described as an example.

  1 to 4, the first images Im1-a and Im1-b are taken in a state where no deposit is grown near the lower portion 11a of the spout 11. The determination unit 53 sets the third region of interest ROI3 including the y coordinate y1 to the first images Im1-a and Im1-b. The y coordinate y <b> 1 is the y coordinate on the lower portion 30 a side of the output flow 30 among the two y coordinates y <b> 1 and y <b> 2 that define the width of the output flow image 300. FIG. 5 is an image diagram showing the first image Im1-a in which the third region of interest ROI3 is set. FIG. 6 is an image diagram showing the first image Im1-b in which the third region of interest ROI3 is set. The position and size of the third region of interest ROI3 set in the first image Im1-a and the position and size of the third region of interest ROI3 set in the first image Im1-b are the same. The size in the x direction and the size in the y direction of the third region of interest ROI3 are each 40 pixels, for example. The y coordinate of the third region of interest ROI3 is the same as the y coordinate of the first region of interest ROI1, but may be different. An image in the third region of interest ROI3 becomes an image of the lower portion 30a of the outgoing flow 30.

  The determination unit 53 cuts out the portion of the third region of interest ROI3 from the first images Im1-a and Im1-b, and performs predetermined image processing on the cut-out images. FIG. 7 is an explanatory diagram for explaining this image processing. The second image Im2-a is an image obtained by cutting out the portion of the third region of interest ROI3 from the first image Im1-a shown in FIG. The second image Im2-b is an image obtained by cutting out the portion of the third region of interest ROI3 from the first image Im1-b shown in FIG. The second images Im2-a and Im2-b are images of the lower portion 30a of the output stream 30.

  The determination unit 53 generates a third image Im3-a by binarizing the second image Im2-a. The determination unit 53 generates a third image Im3-b by binarizing the second image Im2-b. For example, binarization processing is performed by discriminant analysis. The output flow image 300 is indicated by black pixels. The background is indicated by white pixels. The pixel value of the black pixel is 0. The pixel value of the white pixel is 1. The third images Im3-a and Im3-b are images of the lower portion 30a of the output stream 30.

  The determination unit 53 generates a fourth image Im4-1 by performing processing for obtaining an exclusive OR with respect to pixels at the same position in the third image Im3-a and the third image Im3-b. . Pixels that have changed from white pixels to black pixels in a period (predetermined time interval) from the time when the first image Im1-a (FIG. 5) was captured to the time when the first image Im1-b (FIG. 6) was captured Alternatively, a pixel that has changed from a black pixel to a white pixel is indicated by a white pixel. A pixel in which a white pixel state continues or a black pixel state continues in a predetermined time interval is indicated by a black pixel. A white pixel (a pixel whose pixel value has changed at a predetermined time interval) indicates a portion of the image of the lower portion 30a of the outgoing flow 30 where the shape has changed (moved portion) at the predetermined time interval. A black pixel (a pixel whose pixel value does not change at a predetermined time interval) is a portion of the image of the lower portion 30a of the outgoing stream 30 where the shape does not change (a portion that does not move) at the predetermined time interval. Indicates. A large number of white pixels means that the shape change of the image of the lower portion 30a of the output stream 30 is relatively large. On the other hand, the small number of white pixels means that the change in the shape of the image of the lower portion 30a of the output stream 30 is relatively small. The determination unit 53 counts the number of white pixels included in the fourth image Im4-1. The number of white pixels is 130.

  FIG. 8 shows a first image Im1 showing an example of an image picked up first among two consecutive images picked up with deposits growing near the lower portion 11a of the tap mouth 11. It is an image figure of -c. FIG. 9 is an image diagram of the first image Im1-d showing an example of an image captured later among these two images. The determination unit 53 sets the third region of interest ROI3 in the first images Im1-c and Im1-d in the same manner as the first images Im1-a and Im1-b. The y-coordinate y1 (FIG. 5) that defines the width of the output flow image 300 does not necessarily match between the first images Im1-a and Im1-b and the first images Im1-c and Im1-d. Therefore, the position of the third region of interest ROI3 set in the first images Im1-a and Im1-b and the position of the third region of interest ROI3 set in the first images Im1-c and Im1-d are: Does not necessarily match.

  The determination unit 53 cuts out a portion of the third region of interest ROI3 from the first images Im1-c and Im1-d, similarly to the first images Im1-a and Im1-b. The determination unit 53 performs image processing similar to the image processing performed on the first images Im1-a and Im1-b on the clipped image. FIG. 10 is an explanatory diagram for explaining this image processing. The second image Im2-c is an image obtained by cutting out the portion of the third region of interest ROI3 from the first image Im1-c shown in FIG. The second image Im2-d is an image obtained by cutting out the portion of the third region of interest ROI3 from the first image Im1-d shown in FIG. The second images Im2-c and Im2-d are images of the lower portion 30a of the output stream 30.

  The determination unit 53 generates a third image Im3-c by binarizing the second image Im2-c. The determination unit 53 generates a third image Im3-d by binarizing the second image Im2-d.

  The determination unit 53 generates a fourth image Im4-2 by performing processing for obtaining an exclusive OR with respect to pixels at the same position in the third image Im3-c and the third image Im3-d. . Pixels that have changed from white pixels to black pixels during a period (predetermined time interval) from the time when the first image Im1-c (FIG. 8) was captured to the time when the first image Im1-d (FIG. 9) was captured Alternatively, a pixel that has changed from a black pixel to a white pixel is indicated by a white pixel. A pixel in which a white pixel state continues or a black pixel state continues in a predetermined time interval is indicated by a black pixel. The determination unit 53 counts the number of white pixels included in the fourth image Im4-2. The number of white pixels is 13.

  As shown in FIG. 7, when the deposit is not growing near the lower portion 11a of the tap mouth 11, the number of white pixels included in the fourth image Im4-1 is relatively large (130). On the other hand, as shown in FIG. 10, when the deposit grows near the lower portion 11a of the tap mouth 11, the number of white pixels included in the fourth image Im4-2 is relatively small ( 13). The number of white pixels included in the fourth image Im4 is an example of an index value. The index value increases as the image shape change of the lower portion 30a of the output stream 30 increases at a predetermined time interval, and decreases as the image shape change decreases.

  When the index value exceeds a predetermined threshold value Th, the determination unit 53 regards that the shape change of the image of the lower portion 30a of the output flow 30 is relatively large, and When it is determined that the deposit has not grown near the lower portion 11a and the index value is equal to or less than the threshold value Th, the shape change of the image is considered to be relatively small, and the lower portion vicinity 11a of the spout 11 It is determined that the deposit is growing.

  A method for calculating the threshold Th will be described. The user of the molten iron amount measuring device 1 generates a large number of samples of the fourth image Im4-1 using the molten iron amount measuring device 1, and measures the number of white pixels (index value) for each sample. When the deposit is not growing near the lower portion 11a of the shed 11, a first graph showing the distribution of the number of white pixels included in the fourth image Im4-1 is generated. Similarly, the user generates a large number of samples of the fourth image Im4-2 using the molten iron amount measuring device 1, measures the number of white pixels (index value) for each sample, When the deposit grows in the lower portion vicinity 11a, a second graph indicating the distribution of the number of white pixels included in the fourth image Im4-2 is generated. The first graph and the second graph appear to be normally distributed. The average value of the first graph is higher than the average value of the second graph. The user uses the first graph and the second graph to set a threshold value Th that separates the case where the deposit is not growing from the case where the deposit is not growing near the lower portion 11 a of the taphole 11. decide. The user sets the determined threshold value Th in the determination unit 53.

  Referring to FIG. 2, display control unit 54 causes display unit 7 to display an image indicating predetermined information. For example, the display control unit 54 causes the display unit 7 to display an image indicating the hot metal amount measured by the hot metal amount measuring device 1. In addition, when the determination unit 53 determines that the deposit is growing near the lower portion 11a of the tap hole 11, the display control unit 54 causes the display unit 7 to display an image informing that effect. The display control unit 54 and the display unit 7 constitute a notification unit.

  The display unit 7 is realized by a liquid crystal display, an organic EL display (Organic Light Emitting Diode display), or the like.

  The input unit 9 is a device for a user to input a command (for example, start of hot metal measurement, end of hot metal measurement) and the like to the hot metal measurement device 1. The input unit 9 is realized by a keyboard, a mouse, a touch panel, or the like.

  The calculation unit 52 calculates the amount of molten iron taken out from the spout 11 at the first time interval during the entire period in which the spout 30 is taken out from the spout 11. The determination unit 53 determines whether or not deposits have grown in the vicinity of the lower portion 11a of the taphole 11 at the second time interval during the entire period. The length of the first time interval and the length of the second time interval may be the same or different. The timing at which the calculation unit 52 calculates the amount of molten iron taken out from the spout 11 and the determination unit 53 determine whether or not deposits are growing near the lower portion 11 a of the spout 11. The timing may be the same or different.

  The operation of the hot metal amount measuring apparatus 1 for determining whether or not the deposit is growing near the lower portion 11a of the spout 11 will be described. FIG. 11 is a flowchart for explaining this. Referring to FIGS. 2 and 11, determination unit 53 determines whether or not it has reached a timing for determining whether or not deposits are growing near lower portion 11 a of tap hole 11 (step). S1). When the determination unit 53 determines that this timing has not been reached (No in step S1), the determination unit 53 repeats the process of step S1.

  When the determination unit 53 determines that this timing has been reached (Yes in step S1), the determination unit 53 determines whether or not deposits are growing near the lower portion 11a of the taphole 11 ( Step S2).

  When the determination unit 53 determines that the deposit has not grown near the lower portion 11a of the taphole 11 (No in step S2), the determination unit 53 returns to the process of step S1.

  When the determination unit 53 determines that the deposit is growing near the lower portion 11a of the taphole 11 (Yes in step S2), the display control unit 54 indicates that the deposit is growing. An image is displayed on the display unit 7 (step S3). As a result, the user is informed that the deposit is growing near the lower portion 11 a of the tap hole 11.

  When deposits are growing near the lower portion 11 a of the spout 11, the amount of hot metal cannot be measured accurately by measuring the amount of hot metal using the calculation unit 52. In this case, the hot metal amount measuring apparatus 1 may estimate the hot metal amount by extrapolating data in which the hot metal amounts measured in the past are arranged in time series. Alternatively, the hot metal amount measuring device 1 is measured in a state in which it is determined that the deposit is growing near the lower portion 11a of the spout 11 and in a state in which the deposit is removed thereafter. The amount of hot metal may be estimated by interpolating the amount of hot metal arranged in time series. Or when the amount of granulated slag is measured by the granulation facility, the amount of granulated slag may be used as the amount of hot metal.

DESCRIPTION OF SYMBOLS 1 Hot metal amount measuring apparatus 10 Blast furnace 11 Outlet 11a Near lower side part 20 Outlet 20a End part 21 Outlet cover 30 Outlet flow 30a Underside outflow Portion 31 Hot metal 32 Hot metal 300 Outgoing flow image V Movie ROI1 First region of interest ROI2 Second region of interest ROI3 Third region of interest Im1-a, Im1-b, Im1-c, Im1-d First image Im2-a , Im2-b, Im2-c, Im2-d Second image Im3-a, Im3-b, Im3-c, Im3-d Third image Im4-1, Im4-2 Second image

Claims (5)

An acquisition unit for acquiring a plurality of images obtained by imaging the tidal current near the tidal outlet of the vertical furnace at a plurality of times;
Based on the plurality of images acquired by the acquisition unit, the speed and width of the tapping flow are calculated, and are extracted from the tapping outlet using a predetermined formula including the speed and the width as variables. A calculation unit for calculating the amount of molten iron,
Whether or not deposits are growing near the lower part of the tap outlet based on the images of the lower part of the tap stream that are copied to the plurality of images acquired by the acquisition unit. A hot metal amount measuring device comprising: a determination unit for determining.   The determination unit determines that the deposit has not grown near the lower portion of the taphole when the change in the shape of the image is relatively large at a predetermined time interval, and at the predetermined time interval, The hot metal amount measuring apparatus according to claim 1, wherein when the change in the shape of the image is relatively small, it is determined that the deposit is growing near the lower portion of the tap hole.   The determination unit, based on the image, has an index value that increases as the change in the shape of the image increases and decreases as the change in the shape of the image decreases during the predetermined time interval. When the calculated index value exceeds a predetermined threshold value, it is considered that the change in the shape of the image is relatively large, and the deposit grows near the lower portion of the tap hole. When the index value is equal to or less than the threshold value, it is considered that the change in the shape of the image is relatively small, and the deposit is growing near the lower portion of the taphole The hot metal amount measuring device according to claim 2, wherein the determination is made.   The said determination part is further provided with the alerting | reporting part which performs a predetermined alerting | reporting, when it determines with the said deposit growing near the lower part of the said tap hole. The hot metal amount measuring device described. A first step of obtaining a plurality of images obtained by imaging a tidal current near a tidal outlet of a vertical furnace at a plurality of times;
Based on the plurality of images acquired in the first step, the speed and width of the tapping flow are calculated, and are extracted from the tapping outlet using a predetermined formula including the speed and the width as variables. A second step of calculating the amount of molten iron,
Whether or not deposits are growing near the lower part of the tap outlet based on the images of the lower part of the tap stream, which are captured in the plurality of images acquired in the first step. A third step of determining the amount of molten iron.

Images