JP2020063496A - Molten iron and slag state determination device and method - Google Patents

Abstract

To provide a molten iron and slag state determination device and a molten iron and slag state determination method, by which a mixed state of tapping molten iron and slag flow can be determined.SOLUTION: The molten iron and slag state determination device D of the present invention includes an imaging unit 1, a setting unit 22, an extraction unit 23, and a state determination unit 24. The imaging unit is configured to capture a thermal radiance distribution of tapping molten iron and slag flow as a target image constituted by pixels having values for respective pixels corresponding to the thermal radiance. The setting unit is configured to set an evaluation region having a predetermined size in an image of the tapping molten iron and slag flow in the target image captured by the imaging unit 1. The extraction unit is configured to extract a maximum pixel value and a minimum pixel value in the evaluation region set by the setting unit 22. The state determination unit is configured to determine a mixed state of the molten iron and the slag in the tapping molten iron and slag flow on the basis of a ratio of the maximum pixel value to the minimum pixel value extracted by the extraction unit 23.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pig slag state determination device and a pig slag state determination method for determining a mixed state of a tap slag flow flowing out from a tap port.

  In a blast furnace that takes out iron by heat-treating iron ore, the temperature of the mixture of slag (hereinafter, abbreviated as "deposit slag flow" as appropriate) flowing out from the tap hole of the blast furnace for the purpose of operation management. Is often measured. For example, Patent Document 1 discloses one of the techniques for measuring the temperature of such a tapped slag flow.

  The blast furnace tapping temperature measurement method disclosed in Patent Document 1 uses a thermal radiance distribution of a region containing a melt flowing out from a tap hole formed in a blast furnace to obtain a concentration for each pixel corresponding to the thermal radiance. As a density histogram showing the relationship between the density of each pixel and the number of pixels of the image captured by the image capturing step, an image capturing step of capturing an image composed of each pixel having a value, and a molten pig metal concentration distribution and molten slag Density histogram creating step for creating a density histogram including the density distribution of the density distribution and the density histogram created by the density histogram creation step, the hot metal density distribution peak being the density at which the number of pixels is maximum in the hot metal density distribution. Hot metal concentration distribution peak search range setting step for setting the search range, and the hot metal concentration distribution set by the hot metal concentration distribution peak search range setting step In the peak search range, the concentration with the maximum number of pixels, the hot metal concentration distribution peak extraction step of extracting from the concentration histogram as the concentration of the hot metal concentration distribution peak, and the hot metal extracted by the hot metal concentration distribution peak extraction step A hot metal temperature deriving step of deriving the temperature of the hot metal based on the concentration of the concentration distribution peak. Then, the hot metal concentration distribution peak search range setting step is preset, the concentration of the hot metal concentration distribution peak, which is the concentration at which the number of pixels is maximum in the hot metal concentration distribution, and the highest in the molten slag concentration distribution. Based on the slag maximum concentration, which is the concentration, and the upper and lower limits of the concentration ratio, which is the ratio, and the slag maximum concentration in the concentration histogram created by the concentration histogram, based on the hot metal concentration distribution peak search range Derive.

JP, 2013-160627, A

  By the way, the blast furnace tapping temperature measuring method disclosed in Patent Document 1 can relatively well measure the temperature when the concentration histogram has a bimodal profile including two peaks. However, when actually measured, a concentration histogram having the above-mentioned bimodal profile is not always obtained, and for example, a concentration histogram having a gently changing profile is formed, which may make temperature measurement difficult. It was In particular, the molten pig iron flow is a mixture of molten pig metal and molten slag (molten slag), and the translucent molten slag rides on the molten pig iron, so the emissivity of the molten pig iron seen from the surface of the molten pig iron flow is apparent It becomes the value of. Moreover, since the thickness of the molten slag on the molten pig iron is usually different for each place (region), the apparent emissivity also changes for each place (region), and it is more difficult to measure the temperature. Therefore, in order to measure the temperature of the tapped slag stream with higher accuracy, it is important to first determine the mixed state of the tapped slag stream.

  The present invention is an invention made in view of the above-mentioned circumstances, and an object thereof is to provide a pig slag state determination device and a pig slag state determination method that can determine a mixed state of a tap slag flow.

  As a result of various studies, the present inventor has found that the above object can be achieved by the following invention. That is, the pig slag state determination device according to an aspect of the present invention, the thermal radiance distribution of the pig iron flow, as a target image composed of each pixel having a pixel value for each pixel corresponding to the thermal radiance An image capturing unit that captures an image, a setting unit that sets an evaluation region of a predetermined size in the image of the molten pig iron flow in the target image captured by the image capturing unit, and a maximum pixel in the evaluation region set by the setting unit A value and a minimum pixel value extraction unit, based on the ratio of the maximum pixel value and the minimum pixel value extracted by the extraction unit, a state determination unit that determines the mixed state of the hot metal and the molten metal in the molten pig iron flow. Equipped with. Preferably, in the above-mentioned pig slag state determination device, the state determination unit compares a ratio of the minimum pixel value to the maximum pixel value with a preset first threshold value (first determination threshold value). When the ratio is equal to or more than the first threshold value, it is determined that the mixed state is rich in molten slag. The molten slag-rich state means that when viewed from the surface, it looks like molten slag that is substantially unaffected by the molten pig iron, and the apparent emissivity that is allowed according to the specifications of the molten smelt state determination device It is a state that can be regarded as the emissivity of slag. Preferably, in the above-mentioned pig slag state determination device, the state determination unit compares a ratio of the minimum pixel value to the maximum pixel value with a preset second threshold value (second determination threshold value). , When the ratio is less than or equal to the second threshold value, other states except the molten slag rich state as the mixed state (either a state in which molten slag and hot metal are mixed and a state in which molten metal is rich) ) Is determined. The hot metal rich state, when viewed from the surface, only looks like hot metal that is substantially unaffected by the molten metal, and is allowed according to the specifications of the molten metal state determination device, the apparent emissivity of the molten metal is It can be regarded as emissivity. The mixed state is a state between the molten slag rich state and the molten pig iron rich state. Preferably, in the above-mentioned pig slag state determination device, the state determination unit compares a ratio of the minimum pixel value to the maximum pixel value with a preset first range (first determination range). When the ratio is within the first range, it is determined that the mixed state is rich in slag. Preferably, in the above-mentioned pig slag state determination device, the state determination unit compares a ratio of the minimum pixel value to the maximum pixel value with a preset second range (second determination range). , When the ratio is within the second range, other states except the molten slag rich state as the mixed state (either a state in which molten slag and hot metal are mixed or a state in which the molten metal is rich) ) Is determined.

  Generally, it is considered that the emissivity of molten pig iron is about 0.4 and the emissivity of molten slag is about 0.9 to 0.95. Normally, the molten pig iron and slag are mixed in the slag stream, and the apparent emissivity also changes from place to place (region). However, in the whole slag stream, the molten slag on the molten pig iron is included. However, as a result of having a sufficient thickness from the surface, when viewed from the surface, it is considered that there is a region (effective molten metal region) that can be seen only in the molten metal that is not substantially affected by the hot metal. It is most certain that the brightest part of the area is determined as the effective slag area. On the other hand, in the entire slag stream, no molten slag is found on the hot metal, or even when the molten slag is on the hot metal, when viewed from the surface, the effect of the slag is substantially It is considered that there is a region (effective hot metal region) that can be seen only by the hot metal that is not exposed, and it is most probable that the darkest part of the evaluation region of the target image is compared with the effective hot metal region. For this reason, in a normal hot metal flow in which the hot metal and the slag are mixed and the apparent emissivity changes for each place (area), the ratio of the maximum pixel value to the minimum pixel value, for example, the maximum From the above, it is considered that the ratio of the minimum pixel value to the pixel value settles at about 0.45 obtained by dividing 0.4 by (0.9 to 0.95). On the other hand, sometimes, the slag flow from the surface may be in a state where the slag stream is substantially unaffected by the hot metal (smelt-rich state) when viewed from the surface. In this case, it is considered that the minimum pixel value approaches the maximum pixel value, and the ratio of the minimum pixel value to the maximum pixel value becomes a value larger than about 0.45. For this reason, the above-mentioned pig slag state determination device can determine the mixed state of the hot metal and the slag in the tap slag flow based on the ratio between the maximum pixel value and the minimum pixel value.

  In another aspect, in the above-described slag state determination device, the extraction unit is a lower pixel representative value representing from a minimum pixel value in the evaluation area set by the setting unit to a pixel value of a lower fixed ratio. The maximum pixel value is obtained as the minimum pixel value, and the upper pixel representative value representing from the maximum pixel value in the evaluation area set by the setting unit to the pixel value of the upper fixed ratio is obtained as the maximum pixel value.

  Such a slag state determining device obtains the minimum pixel value with the lower pixel representative value and obtains the maximum pixel value with the upper pixel representative value, so that robustness can be improved, noise resistance is high, and more stable determination is possible. The result can be obtained.

  In another aspect, in these pig iron state determination devices, the state determination unit compares the ratio of the minimum pixel value to the maximum pixel value, and a preset predetermined threshold value or range, When the ratio is equal to or more than the threshold value or within the range, it is determined that the mixed state is a molten-salt-rich state, and if the state determination unit determines that the mixed state is a molten-rich state, it is determined in advance. Further, it further comprises a temperature calculation unit for obtaining the hot metal temperature from the correspondence between the maximum pixel value and the hot metal temperature and the maximum pixel value.

  The inventor, as a result of various examinations, when the molten pig iron flow is in a molten metal rich state, the molten iron is not visible when viewed from the surface, but since the molten iron is also included in the molten pig iron flow together with the molten metal, It was found that there is a correlation between the maximum pixel value (the molten slag temperature that can be obtained based on the maximum pixel value) and the hot metal temperature. The above-mentioned pig slag state determination device, even when the tap slag flow is in a slag rich state, previously obtained, using the corresponding relationship between the maximum pixel value and the hot metal temperature that are correlated with each other, the maximum extracted by the extraction unit The hot metal temperature can be obtained from the pixel value.

  A pig iron temperature measuring method according to another aspect of the present invention, a thermal radiance distribution of the pig iron slag flow as a target image composed of each pixel having a pixel value for each pixel corresponding to the thermal radiance An image capturing step of capturing an image, a setting step of setting an evaluation area of a predetermined size in the image of the pig-iron flow in the target image captured in the image capturing step, and a maximum pixel in the evaluation area set in the setting step. A value and a minimum pixel value extraction step, based on the ratio of the maximum pixel value and the minimum pixel value extracted in the extraction step, a state determination step of determining the mixed state of the hot metal and the molten metal in the tapped slag flow, Equipped with.

  In a normal molten pig iron flow in a state where hot metal and molten metal are mixed, the ratio between the maximum pixel value and the minimum pixel value, for example, the ratio of the minimum pixel value to the maximum pixel value settles around 0.45. On the other hand, it is considered that the ratio of the minimum pixel value to the maximum pixel value is larger than about 0.45 in the molten pig iron slag flow in the molten metal rich state. Therefore, the above-mentioned pig slag state determination method can determine the mixed state of the hot metal and the slag in the tap slag flow, based on the ratio of the maximum pixel value and the minimum pixel value.

  INDUSTRIAL APPLICABILITY The pig slag state determining apparatus and the pig slag state determining method according to the present invention can determine the mixed state of the discharged pig iron stream.

It is a block diagram which shows the structure of the pig-slag state determination apparatus in embodiment. It is a figure for demonstrating a mode that the outgoing pig iron flow judged by the said pig slag state judgment device flows out. It is a figure which shows the relationship of a maximum pixel value and hot metal temperature in a molten metal rich state. It is a figure which shows an example of the target image of a pig iron slag flow. FIG. 3 is a diagram schematically showing a partial cross section of a taphole flow in order to explain the significance of the minimum pixel value and the maximum pixel value in the taphole flow. It is a figure which shows the ratio of the minimum pixel value with respect to the maximum pixel value in a pig-iron flow as an example. As another example, it is a diagram showing the ratio of the minimum pixel value to the maximum pixel value in the pig iron flow. It is a flow chart which shows operation in the above-mentioned pig slag state judging device. It is a figure for demonstrating the modification of the said pig-iron state determination device.

  An embodiment of the present invention will be described below with reference to the drawings. It should be noted that in each of the drawings, the components denoted by the same reference numerals indicate the same components, and the description thereof will be appropriately omitted. In the present specification, reference numerals without suffixes are used for generic names, and reference numerals with suffixes are used when referring to individual components.

  FIG. 1 is a block diagram showing a configuration of a pig-slag state determination device according to an embodiment. FIG. 2 is a diagram for explaining how the discharged pig iron stream determined by the pig iron state determination device flows out. FIG. 3 is a diagram showing the relationship between the maximum pixel value and the hot metal temperature in the molten metal rich state. The horizontal axis of FIG. 3 is the maximum pixel value, and the vertical axis thereof is the temperature. FIG. 4 is a diagram showing an example of a target image of the pig-iron flow. FIG. 4A shows a target image of the tap slag flow in a state where the slag is rich, and FIG. 4B shows a target image of the tap slag flow in a state where normal molten pig metal and slag are mixed. FIG. 5 is a diagram schematically showing a partial cross section of the tap slag flow in order to explain the significance of the minimum pixel value and the maximum pixel value in the tap slag flow. FIG. 6 is a diagram showing, as an example, a ratio of the minimum pixel value to the maximum pixel value in the pig-iron flow. FIG. 7 is a diagram showing, as another example, the ratio of the minimum pixel value to the maximum pixel value in the pig-iron flow. Each horizontal axis in FIGS. 6 and 7 is time, and each vertical axis thereof is a ratio of the minimum pixel value to the maximum pixel value.

  The pig iron state determination device D in the present embodiment obtains the pig iron mixture obtained by capturing an image of the pig iron mixture flowing from the tap hole of the blast furnace (hereinafter, abbreviated as "deposit pig stream" as appropriate). An apparatus for determining a mixed state of hot metal and slag in the tapped slag flow based on a target image of the slag flow. Then, in the present embodiment, the pig iron state determination device D further obtains the pig iron temperature based on the maximum pixel value when the pig iron slag flow is determined to be in the molten pig rich state. The above-mentioned pig slag mixture (a tap slag stream) is a mixture of hot metal and slag (molten slag), and is discharged in a high temperature fluid form from the tap hole of a blast furnace. Such a pig slag state determination device D includes, for example, as shown in FIG. 1, an imaging unit 1, a control processing unit 2, and a storage unit 3, and in the present embodiment, further an input unit 4 and An output unit 5 and an interface unit (IF unit) 6 are provided.

  The imaging unit 1 is connected to the control processing unit 2 and, under the control of the control processing unit 2, configures the thermal radiance distribution of the pig-iron flow from each pixel having a pixel value for each pixel corresponding to the thermal radiance. It is a device that captures a target image to be captured. The imaging unit 1 outputs the target image of the pig-iron flow to the control processing unit 2. The image pickup unit 1 is, for example, an imaging optical system that forms an optical image of a subject on a predetermined image forming surface, and is arranged with the light receiving surface aligned with the image forming surface. The digital camera and the like include an area image sensor for converting into a signal and an image processing circuit for generating image data that is data representing an image of the subject by performing image processing on the output of the area image sensor. The image pickup unit 1 may be a still camera that produces a still image, or a video camera (movie camera) that produces a moving image.

  For example, as shown in FIG. 2, the imaging unit 1 can capture an image of the tapped metal flow PS flowing out from the tapped hole PH formed in the blast furnace SF to the tapped metal SG SG provided with the tapped gutter cover CV. Are appropriately arranged. Since the tapped slag flow PS flows out from the tapped hole PH at a relatively high speed, the imaging unit 1 is configured to be able to image at a speed according to the outflow speed of the tapped slag flow PS. The image pickup unit 1 may be housed in a casing (not shown) together with the other units 2 to 6 in the pig-iron condition determination device D, and may be configured integrally with the other units 2 to 6, but in the present embodiment, the image pickup is performed. The unit 1 is configured separately from each of the other units 2 to 6, and the imaging unit 1 is arranged remotely from each of the other units 2 to 6 so as to be able to capture an image of the pig iron slag flow PS. It is communicably connected to the control processing unit 2 by wire or wirelessly.

  Returning to FIG. 1, the input unit 4 is connected to the control processing unit 2 and, for example, various commands such as a command for instructing the determination of the mixed state and the start of the temperature measurement, and the mixed input such as the setting input of the evaluation area. It is a device for inputting various data necessary for state determination and temperature measurement to the pig-iron state determination device D, and is, for example, a plurality of input switches to which predetermined functions are assigned, a keyboard and a mouse. The output unit 5 is connected to the control processing unit 2, and under the control of the control processing unit 2, the command and data input from the input unit 4, and the mixed state determined by the pig-slag state determination device D and the determination thereof. The device is a device that outputs the obtained temperature and the like, and is, for example, a display unit (display device) such as a CRT display, an LCD (liquid crystal display device) and an organic EL display, or a printing device such as a printer.

  The IF 6 is a circuit that is connected to the control processing unit 2 and that inputs and outputs data to and from an external device under the control of the control processing unit 2, for example, an interface circuit of RS-232C that is a serial communication system. , An interface circuit using the Bluetooth (registered trademark) standard, an interface circuit using the USB (Universal Serial Bus) standard, and the like. Further, the IF unit 6 may be, for example, a communication interface circuit that transmits and receives a communication signal to and from an external device, such as a data communication card or a communication interface circuit conforming to the IEEE 802.11 standard.

  The storage unit 3 is a circuit which is connected to the control processing unit 2 and stores various predetermined programs and various predetermined data under the control of the control processing unit 2. The various predetermined programs include, for example, a control program for controlling each of the units 1, 3 to 6 of the pig-slag state determination device D according to the function of each unit, and an output in the target image captured by the image capturing unit 1. A setting program for setting an evaluation area ROI of a predetermined size in the image of the slag and a maximum pixel value (brightest pixel value, maximum brightness value) and minimum pixel value (in the evaluation area ROI set by the setting program) Based on the extraction program for extracting the darkest pixel value, the minimum brightness value at a value greater than 0, and the ratio of the maximum pixel value and the minimum pixel value extracted by the extraction program, the hot metal and the molten metal in the molten pig iron stream are melted. A state determination program for determining the mixed state with the slag, and the state determination program, if it is determined as a molten slag-rich state as the mixed state as described below, determined in advance, And a maximum pixel value extracted in correspondence to the extracted program with a large pixel value and the hot metal temperature, include control processing program temperature calculation programs for obtaining the molten iron temperature. In the present embodiment, the temperature calculation program further includes the maximum pixel value extracted by the extraction program when the state determination program determines that the mixed state is other than the molten slag-rich state as described below. On the basis of the above, the molten metal temperature of the molten metal contained in the molten pig iron flow is obtained, and the molten metal temperature of the molten pig iron contained in the molten pig iron flow is calculated based on the minimum pixel value extracted by the extraction program. The various types of predetermined data include, for example, target images, calibration information, temperature conversion information, and other data necessary for executing each program. The storage unit 3 includes, for example, a ROM (Read Only Memory) which is a non-volatile storage element and an EEPROM (Electrically Erasable Programmable Read Only Memory) which is a rewritable non-volatile storage element. The storage unit 3 includes a RAM (Random Access Memory) or the like serving as a working memory of a so-called control processing unit 2 that stores data and the like generated during execution of the predetermined program. The storage unit 3 may include a hard disk device having a relatively large storage capacity.

  The storage unit 3 functionally includes a calibration information storage unit 31 that stores the calibration information and a temperature conversion information storage unit 32 that stores the temperature conversion information.

  The calibration information is a first correspondence relationship between a pixel value of an image obtained by capturing an image of a so-called black body furnace by the image capturing unit 1 and a brightness value of a black body radiance of the black body furnace, for example, It is created in advance by imaging the black body furnace with the imaging unit 1 at each of a plurality of different temperatures. Since the brightness value of the black body radiance is a function of temperature, the calibration information includes the pixel value of an image obtained by capturing an image of the black body furnace by the image capturing unit 1 and the temperature of the black body furnace. It becomes the correspondence of. For example, by converting each pixel value of each pixel in the target image into each brightness value by the calibration information, a brightness image of thermal radiance, that is, a temperature image can be generated. The calibration information may be stored in the calibration information storage unit 31 in the form of a relational expression representing the first correspondence relationship, or may be stored in the calibration information storage unit 31 in the form of a table representing the first correspondence relationship. good.

The temperature conversion information is a second correspondence relationship between the maximum pixel value and the hot metal temperature when the molten pig iron flow is in a molten metal rich state, and is obtained in advance by using a plurality of samples. When the molten pig iron stream is in a molten metal rich state, the molten pig iron cannot be seen from the surface, but since the molten pig iron is also included in the molten pig iron stream together with the molten metal, the maximum pixel value (based on the maximum pixel value From the knowledge that there is a correlation between the hot metal temperature and the hot metal temperature that can be obtained, in order to obtain the hot metal temperature in the temperature calculation unit 25, which will be described later, when the tap hot metal flow is in a hot metal rich state, The temperature conversion information is obtained in advance and stored in the storage unit 3. An example of the temperature conversion information is shown in FIG. In the example shown in FIG. 3, the maximum pixel value x and the hot metal temperature y have a correlation coefficient R of y = 0.6224x + 1404.6 and R ² = 0.9567 according to the linear regression line. The temperature conversion information may be stored in the temperature conversion information storage unit 32 in the form of a relational expression representing the second correspondence relationship as described above, or may be stored in the form of a table representing the second correspondence relationship. It may be stored in the unit 32.

  The control processing unit 2 controls each of the units 1, 3 to 6 of the pig slag state determination device D according to the function of each unit, determines the mixed state of the tap slag flow, and determines the temperature of the hot metal and the temperature of the slag. Is a circuit for obtaining. The control processing unit 2 includes, for example, a CPU (Central Processing Unit) and its peripheral circuits. The control processing unit 2 functionally includes a control unit 21, a setting unit 22, an extraction unit 23, a state determination unit 24, and a temperature calculation unit 25 by executing the control processing program.

  The control unit 21 controls each of the units 1, 3 to 6 of the pig-iron state determination device D in accordance with the function of each unit, and controls the entire pig-iron state determination device D.

  The setting unit 22 sets an evaluation region ROI of a predetermined size in the image of the pig-iron flow in the target image captured by the image capturing unit 1. For example, the setting unit 22 may output the target image to the output unit 5, accept the setting operation by the user at the input unit 4, and set the evaluation region ROI in the image of the pigtail flow in the target image. Alternatively, for example, the setting unit 22 may automatically set the evaluation region ROI in the image of the pig-iron flow in the target image. More specifically, for example, the setting unit 22 first detects the edge of the image area of the molten pig iron flow in the target image by using the edge filter, and thereby detects the image area of the molten pig iron flow in the target image. Extract. Then, the setting unit 22 sets the evaluation area ROI of the predetermined size in the image area of the tap-iron flow in the extracted target image. For example, from the viewpoint of measuring the temperature of the tap slag flow PS for the purpose of operation management of the blast furnace, and from the viewpoint that imaging of the tap slag flow PS is obstructed by smoke or the like generated as the distance from the tap hole PH increases. The setting unit 22 sets the evaluation region ROI in the image of the taphole slag flow at a position where the influence of slag accumulation, smoke, etc. near the taphole is as small as possible. The size of the evaluation area ROI is appropriately set by using a plurality of samples, and is, for example, about 2 / of the width of the image area of the taphole flow (the length in the width direction substantially orthogonal to the outflow direction). It is set as a square or a rectangle having a length of 3 or about ½.

  The extraction unit 23 determines the maximum pixel value (the brightest pixel value, the maximum luminance value) and the minimum pixel value (the darkest pixel value, the minimum luminance value greater than 0) in the evaluation area ROI set by the setting unit 22. To extract.

  The state determination unit 24 determines the mixed state of the hot metal and the molten metal in the molten pig iron flow based on the ratio between the maximum pixel value and the minimum pixel value extracted by the extraction unit 23.

  Generally, it is considered that the emissivity of molten pig iron is about 0.4 and the emissivity of molten slag is about 0.9 to 0.95. The molten pig iron stream is a mixture of molten pig iron and molten pig iron. For example, as shown in FIGS. 5A and 5B, a semi-transparent molten metal is placed on the molten pig iron, so that the molten pig iron seen from the surface of the molten pig iron stream. The emissivity of will be an apparent value. Moreover, since the thicknesses D11, D12, and D2 of the molten slag on the molten pig iron differ from place to place (region), the apparent emissivity also changes from place to place (region), and the slag stream In one example, the image is a marble pattern image as shown in FIG. 4B. It should be noted that, since there is a temporal difference of 10 ms or less between the pixels of the target image from the flow velocity of the pig iron slag flow PH, it is unlikely that the temperature will suddenly drop in this minute time. It is considered that the thickness of the molten slag that rides on the slag is different and the influence of the slag is different.

  However, as shown in FIG. 5B, even if the molten metal on the molten pig iron has a sufficient thickness from the surface in the entire molten pig iron flow, as a result, when viewed from the surface, the influence of the molten pig iron is substantially exerted. It is considered that there is a region (effective slag region) that can be seen only in the slag that does not receive the image, and it is most certain that the brightest part of the evaluation region of the target image is determined as the effective slag region. On the other hand, as shown in FIG. 5A and FIG. 5B, when the molten metal is not on the hot metal, or when the molten metal is on the hot metal, as seen from the surface, , It is considered that there exists a region (effective hot metal region) that is substantially visible only to the hot metal that is not affected by the molten slag, and the darkest part of the evaluation region of the target image can be compared to the effective hot metal region. Most likely. For this reason, as shown in FIG. 4B, in the case of the normal molten pig iron flow in which the molten pig iron and the molten slag are mixed and the apparent emissivity also changes from place to place (region), the maximum pixel value and the minimum pixel value are From the above, it is considered that the ratio of the minimum pixel value to the maximum pixel value and the ratio of the minimum pixel value to the maximum pixel value settle down to about 0.45 obtained by dividing 0.4 by (0.9 to 0.95). On the other hand, as shown in FIG. 4A, on the other hand, as shown in FIG. 4A, when viewed from the surface, the molten pig iron stream is in a state in which it appears as if it is substantially unaffected by the molten pig iron (smelt rich state). Sometimes. In this case, it is considered that the minimum pixel value approaches the maximum pixel value, and the ratio of the minimum pixel value to the maximum pixel value becomes a value larger than about 0.45.

  In fact, in the embodiment shown in FIG. 6, in the target image of the pig-iron flow that looks like a marble pattern after time 100, the ratio of the minimum pixel value to the maximum pixel value is 0.58 ± 0.03 (standard deviation). 1σ = 0.03), and the ratio of the minimum pixel value to the maximum pixel value in the target image of the molten pig iron flow in the molten metal rich state from the tapping (time 0) to time 50 is , 0.80 ± 0.05 (standard deviation 1σ = 0.05). In addition, in another embodiment shown in FIG. 7, in the target image of the tap stream flowing that looks like a marble pattern after time 65, the ratio of the minimum pixel value to the maximum pixel value is 0.55 ± 0.06 (standard The deviation is 1σ = 0.06) and the ratio of the minimum pixel value to the maximum pixel value in the target image of the molten pig iron flow in the molten metal rich state from the tapping (time 0) to the time 65. Fluctuates within the range of 0.85 ± 0.07 (standard deviation 1σ = 0.07). The difference between the data shown in FIG. 6 and the data shown in FIG. 7 is due to a slight difference in the experimental system such as individual differences of the image pickup unit 1 actually used and variations in the installation mode of the image pickup unit 1. The inventor speculates.

  From this, for example, by comparing the ratio of the minimum pixel value to the maximum pixel value with a predetermined threshold value that is set in advance, it is possible to determine the mixed state of the hot metal and the molten metal in the molten pig iron flow. More specifically, the state determination unit 24 compares the ratio of the minimum pixel value to the maximum pixel value and a preset first threshold value (first determination threshold value), and the ratio is the first threshold value. When the above is the case, it is determined that the mixed state is rich in slag. As shown in FIG. 4A, in one example, the molten slag-rich state looks like a molten slag that is substantially unaffected by the molten pig iron when viewed from the surface, and is allowed according to the specifications of the molten pig smelt state determination device. The apparent emissivity can be regarded as the emissivity of the molten slag. The first determination threshold value is appropriately set to, for example, 0.65, 0.7, 0.75 or the like from the embodiments shown in FIGS. 6 and 7. The state determination unit 24 compares the ratio of the minimum pixel value to the maximum pixel value with a preset second threshold value (second determination threshold value), and when the ratio is equal to or less than the second threshold value, The mixed state is determined to be a state other than the molten slag-rich state (either a mixed state of molten slag and molten pig iron or a molten pig iron rich state). The hot metal rich state, when viewed from the surface, looks like only hot metal that is substantially unaffected by the slag, and is allowed according to the specifications of the hot metal condition determination device, the apparent emissivity of the hot metal is It can be regarded as emissivity. The mixed state is, for example, as shown in FIG. 4B, a state between the molten slag-rich state and the molten pig iron-rich state in which molten slag and hot metal are mixed. The second determination threshold value is appropriately set to, for example, 0.7 or 0.65 from the embodiments shown in FIGS. 6 and 7. The second determination threshold may be the same value as the first determination threshold, and may be different as long as the above-mentioned purpose is satisfied.

  From the above, or, for example, by comparing the ratio of the minimum pixel value to the maximum pixel value, and a predetermined range set in advance, the mixed state of the hot metal and the molten metal in the tap hot metal flow is determined. it can. The state determination unit 24 compares the ratio of the minimum pixel value to the maximum pixel value with a preset first range (first determination range), and when the ratio is within the first range, It is determined that the mixed state is rich in slag. The first determination range is, for example, the range from 0.92 to 0.78, the range from 0.85 to 0.75, the range from 0.89 to 0. The range up to 77 ((0.92 + 0.85) /2≈0.89, (0.78 + 0.75) /2≈0.77) is appropriately set. The state determination unit 24 compares the ratio of the minimum pixel value to the maximum pixel value with a preset second range (second determination range), and when the ratio is within the second range, The mixed state is determined to be a state other than the molten slag-rich state (either a mixed state of molten slag and molten pig iron or a molten pig iron rich state). 6 and 7, the second determination range is, for example, a range of 0.61 to 0.55, a range of 0.61 to 0.49, or a range of 0.61 to 0. The range up to 52 ((0.61 + 0.61) /2=0.61, (0.55 + 0.49) /2=0.52) is appropriately set.

  When the state determination unit 24 determines that the mixed state is rich in molten slag, the temperature calculation unit 25 determines the second correspondence between the maximum pixel value and the hot metal temperature, which is obtained in advance and stored in the temperature conversion information storage unit 32. The hot metal temperature is obtained from the relationship and the maximum pixel value extracted by the extraction unit 23. In the present embodiment, the temperature calculation unit 25 further obtains the slag temperature of the slag contained in the molten pig iron flow based on the maximum pixel value extracted by the extraction unit 23. More specifically, the temperature calculation unit 25 converts the maximum pixel value extracted by the extraction unit 23 into a brightness value of thermal radiance by using the calibration information, and obtains the temperature as the melt temperature. . Then, in the present embodiment, the temperature calculation unit 25 further sets the state determination unit 24 as a mixed state other than the molten metal rich state (a state in which the molten metal and the molten metal are mixed and a molten metal rich state. If any of the above) is determined), the hot metal temperature of the hot metal contained in the molten pig iron slag is obtained based on the minimum pixel value extracted by the extraction unit 23, and based on the maximum pixel value extracted by the extraction unit 23. Then, the slag temperature of the slag contained in the slag stream is obtained. More specifically, the temperature calculation unit 25 uses the minimum pixel value extracted by the extraction unit 23 as the brightness value of the thermal radiance by using the calibration information stored in the calibration information storage unit 31 of the storage unit 3. The temperature is converted and the temperature is determined as the hot metal temperature. Similarly, the temperature calculator 25 converts the maximum pixel value extracted by the extractor 23 into a brightness value of thermal radiance by using the calibration information, and obtains the temperature as the melt temperature.

  The calibration information is a value obtained by using a black body furnace as described above. Since the slag flow of the implementation is not a black body, it has an error accordingly. Therefore, the temperature calculation unit 25 may obtain the hot metal temperature or the molten metal temperature by correcting the error, as disclosed in Patent Document 1, for example.

  The control processing unit 2, the storage unit 3, the input unit 4, the output unit 5, and the IF unit 6 can be configured by, for example, a desktop type or node type computer.

  Next, the operation of this embodiment will be described. FIG. 8 is a flowchart showing an operation in the pig-slag state determination device.

  When the power is turned on, the pig slag state determining device D having such a configuration initializes necessary parts and starts its operation. By executing the control processing program, the control processing unit 2 functionally includes a control unit 21, a setting unit 22, an extraction unit 23, a state determination unit 24, and a temperature calculation unit 25.

  Then, in evaluating the mixing state and temperature in the tap slag flow, in FIG. 8, the pig slag state determination device D is controlled by the control processing unit 2 from the tap hole PH formed in the blast furnace SF in the imaging unit 1 by the control processing unit 2. An image of the outgoing pigtail flow PS is captured, and a target image including the image of the pigtail flow PS is acquired (S11).

  Next, the pig-slag state determination device D causes the setting unit 22 of the control processing unit 2 to set an evaluation region of a predetermined size in the image of the pig-iron flow in the target image captured by the image capturing unit 1 in the process S11. Set (S12). As described above, the setting of the evaluation area is performed by accepting the setting operation of the user (operator) by the input unit 4 or automatically.

  In one example, the target image POa shown in FIG. 4A is acquired by executing the process S11, and the evaluation region ROIa indicated by a square is set in the image PPa of the pig-iron flow in the target image POa by executing the process S12. . In the target image POa, the image PPa of the molten pig iron slag flow is mostly a high-luminance region due to the molten slag rich state. In another example, the target image POb shown in FIG. 4B is acquired by performing the process S11, and the evaluation region ROIb indicated by a square is included in the image PPb of the piggyback stream in the target image POb by performing the process S12. Is set. The image PPb of the molten pig iron flow in the target image POb has a so-called marble pattern due to the difference between the emissivity of the molten pig iron and the emissivity of the molten pig iron and the mixed state thereof.

  Next, in the pig iron state determination device D, the extraction unit 23 of the control processing unit 2 causes the maximum pixel value (the brightest pixel value, the brightest pixel value, The maximum brightness value) and the minimum pixel value (darkest pixel value, minimum brightness value greater than 0) are extracted (S13).

  Next, in the pig slag state determination device D, the state determination unit 24 of the control processing unit 2 obtains the ratio between the maximum pixel value and the minimum pixel value extracted by the extraction unit 23 in the process S13. More specifically, in this embodiment, the state determination unit 24 obtains the ratio of the minimum pixel value to the maximum pixel value (ratio = minimum pixel value / maximum pixel value).

  Next, in the pig iron state determination device D, the state determination unit 24 of the control processing unit 2 compares the ratio of the minimum pixel value to the maximum pixel value with the first determination range, and the ratio is the first determination. It is determined whether it is within the range (S15). In the pig-slag state determination device D, the state determination unit 24 of the control processing unit 2 compares the ratio of the minimum pixel value to the maximum pixel value with the first determination threshold value, and the ratio is the first determination threshold value. You may determine whether it is above.

  As a result of this determination, if the ratio is within the first determination range (Yes), the pig-slag state determination device D then sequentially performs the processes of process S16 and process S17, and then performs the process. Execute S18. In the case of comparing the ratio with the first determination threshold value, if the ratio is equal to or more than the first determination threshold value (Yes), the pig-slag state determination device D then performs the process S16 and the process. After sequentially executing the processes of S17, the process S18 is executed.

  In this process S16, the pig slag state determination device D determines the mixed state to be a slag rich state by the state determination unit 24 of the control processing unit 2.

  Then, in the processing S17, the pig-slag state determination device D has the second correspondence relationship between the maximum pixel value and the hot metal temperature stored in the temperature conversion information storage unit 32 by the temperature calculation unit 25 of the control processing unit 2. The hot metal temperature is obtained from the maximum pixel value extracted by the extraction unit 23 in step S13. More specifically, the temperature calculation unit 25 obtains the hot metal temperature corresponding to the maximum pixel value extracted by the extraction unit 23 in the process S13 from the second correspondence relationship. Then, the temperature calculation unit 25 converts the maximum pixel value extracted by the extraction unit 23 in the process S13 into a brightness value of thermal radiance by using the calibration information, and obtains the temperature as the melt temperature.

  On the other hand, as a result of the determination in the process S15, if the ratio is not within the first determination range (No), the pig-slag state determination device D causes the state determination unit 24 of the control processing unit 2 to perform the mixed state. Is determined to be any other state except the molten slag rich state (S21), and then the process S22 is executed. In the case of comparing the ratio with the first determination threshold value, if the ratio is not equal to or more than the first determination threshold value (No), the pig-slag state determination device D performs the process S21 after performing the process S21. , Process S22 is executed.

  In this processing S22, the pig-slag state determination device D compares the ratio of the minimum pixel value to the maximum pixel value with the second determination range by the state determination unit 24 of the control processing unit 2, and the ratio is the first 2 It is determined whether it is within the determination range. In the pig-slag state determination device D, the state determination unit 24 of the control processing unit 2 compares the ratio of the minimum pixel value to the maximum pixel value with the second determination threshold value, and the ratio is the second determination threshold value. It may be determined whether or not the following.

  As a result of this determination, when the ratio is within the second determination range (Yes), the pig-slag state determination device D next performs the process S23 and then the process S18. On the other hand, as a result of the determination, if the ratio is not within the second determination range (No), the pig-slag state determination device D ends this process. In the case of comparing the ratio with the second determination threshold value, if the ratio is equal to or less than the second determination threshold value (Yes), the pig-slag state determination device D then executes a process S23. After that, the process S18 is executed, and when the ratio is not equal to or less than the second determination threshold value (No), the pig-slag state determination device D ends the present process.

  In this processing S23, the pig-slag state determination device D causes the temperature calculation unit 25 of the control processing unit 2 to output the pig-iron flow based on each of the maximum pixel value and the minimum pixel value extracted by the extraction unit 23 in the processing S13. The molten slag temperature and the molten pig iron temperature of the molten slag and the molten pig iron respectively contained in are obtained. More specifically, the temperature calculation unit 25 uses the calibration information stored in the calibration information storage unit 31 of the storage unit 3 as the maximum pixel value extracted by the extraction unit 23 in the process S13 to calculate the thermal radiance. Is converted into a brightness value of, and the temperature is obtained as the molten slag temperature. Then, the temperature calculation unit 25 converts the minimum pixel value extracted by the extraction unit 23 in the process S13 into a brightness value of thermal radiance by using the calibration information, and obtains the temperature as the hot metal temperature.

  Then, in the process S18, the pig iron state determination device D causes the control unit 21 to output the mixed state (a molten pig rich state or another state), the molten pig iron temperature, and the molten tin temperature from the output unit 5 to the outside. Output to and end this processing. Note that the control unit 21 may output each of the mixed state, the hot metal temperature, and the molten metal temperature from the IF unit 6 to an external device, if necessary.

  When the above-described respective processes for obtaining the mixed state, the molten pig iron temperature, and the molten slag temperature in the tapped slag flow are performed at predetermined time intervals during the operation of the blast furnace SF, for example, when the imaging unit 1 generates a moving image. It is repeatedly executed every several frames, and the mixing state, the hot metal temperature and the slag temperature in the tap slag flow are monitored.

  As described above, the pig slag state determination device D and the pig slag state determination method implemented in the present embodiment are based on the ratio between the maximum pixel value and the minimum pixel value, and detect the molten pig iron in the tap slag flow. The mixed state with the molten slag can be judged.

  The above-mentioned pig slag state determination device D and the pig slag state determination method, even when the tap slag flow is in a slag rich state, have a second correspondence relationship between the maximum pixel value and the hot metal temperature, which are obtained in advance and are correlated with each other. By using this, the hot metal temperature can be obtained from the maximum pixel value extracted by the extraction unit 23.

  In addition, in the above-mentioned embodiment, although the imaging state of the tapped slag flow was imaged from one direction by one imaging part 1 and the mixing state and temperature in the tapped slag flow were measured, it is orthogonal to the tapped slag flow. Each mixing state and each temperature in the tap slag flow observed by the two imaging units 1 from the two directions of the horizontal direction and the vertical direction may be measured.

  Further, in the above-described embodiment, the extraction unit 23 sets the lower pixel representative value representing the minimum pixel value to the pixel value of the lower fixed ratio in the evaluation area ROI (ROIa, ROIb) set by the setting unit 22 to the minimum. A pixel value may be obtained, and an upper pixel representative value representing from a maximum pixel value in the evaluation area ROI (ROIa, ROIb) set by the setting unit 22 to a pixel value of a certain upper proportion may be obtained as the maximum pixel value. The state determination unit 24 determines the mixed state based on the maximum pixel value and the minimum pixel value thus obtained, and the temperature calculation unit 25 based on the maximum pixel value and the minimum pixel value thus obtained. To determine the hot metal temperature and the hot metal temperature in the tap slag flow.

  FIG. 9: is a figure for demonstrating the modification of the said pig-iron state determination device. The horizontal axis of FIG. 9 is the pixel value (brightness), and the vertical axis thereof is the frequency. When the frequency of the pixel value of each pixel in the evaluation area ROI is graphed, the graph shown in FIG. 9 is obtained as an example. In the above-described embodiment, in the example shown in FIG. 9, only the minimum pixel value min is used, but in this modification, the lower pixel representative value representing the minimum pixel value min to the pixel value X1 of the lower fixed ratio is Considered to be the minimum pixel value. The lower fixed ratio is, for example, 10%, 7%, 5%, 3%, 1%, the ratio corresponding to the lower 10th place, the ratio corresponding to the lower 5th place, and the ratio corresponding to the lower 3rd place. Etc., and is set appropriately. The lower pixel representative value is a weighted average value in consideration of the frequency or an arithmetic operation in consideration of temporal variation with respect to the pixel value X1 itself at a lower fixed ratio or the pixel value within the lower fixed ratio from the minimum pixel value min. It is a statistical value such as an average value. Similarly, in the above-described embodiment, only the maximum pixel value max is used in the example shown in FIG. 9, but in this modification, the upper pixel representing the maximum pixel value man to the pixel value X2 of the upper fixed ratio is used. The representative value is regarded as the maximum prime value. The top fixed ratio is, for example, 10%, 7%, 5%, 3%, 1%, the ratio corresponding to the top ten, the ratio corresponding to the top five, and the ratio corresponding to the top three. Etc., and is set appropriately. The upper pixel representative value is a pixel value X2 itself at a constant upper ratio, or a pixel value within a constant upper ratio from the maximum pixel value man, a weighted average value in consideration of frequency, or an arithmetic operation considering temporal variation. It is a statistical value such as an average value.

  Since the pig slag state determination device D and the method thereof in such a modified embodiment use respective representative values, robustness can be improved, noise resistance is high, and more stable measurement results can be obtained.

  In order to represent the present invention, the present invention has been adequately and sufficiently described through the embodiments with reference to the drawings, but those skilled in the art can easily modify and / or improve the above embodiments. It should be recognized that this is possible. Therefore, unless a modification or improvement performed by a person skilled in the art is at a level that departs from the scope of rights of the claims recited in the claims, the modification or the improvement is covered by the scope of rights of the claims. Is understood to be included in.

D Pigment state determination device ROIa, ROIb Evaluation area 1 Imaging unit 2 Control processing unit 3 Storage unit 21 Control unit 22 Setting unit 23 Extraction unit 24 State determination unit 25 Temperature calculation unit 31 Calibration information storage unit 32 Temperature conversion information storage unit

Claims (4)

An imaging unit that captures the thermal radiance distribution of the pig iron slag flow as a target image composed of each pixel having a pixel value for each pixel corresponding to the thermal radiance,
A setting unit that sets an evaluation area of a predetermined size in the image of the pig-iron flow in the target image captured by the image capturing unit;
An extraction unit that sets the maximum pixel value and the minimum pixel value in the evaluation area set by the setting unit;
Based on the ratio of the maximum pixel value and the minimum pixel value extracted by the extraction unit, a state determination unit for determining a mixed state of the molten pig iron and the molten metal in the molten pig iron flow,
Pigment condition determination device. The extraction unit obtains a lower pixel representative value representing from a minimum pixel value in the evaluation region set by the setting unit to a pixel value of a lower fixed ratio as the minimum pixel value, and the evaluation region set by the setting unit. The upper pixel representative value representing from the maximum pixel value in the above to the pixel value of the upper fixed ratio is obtained as the maximum pixel value,
The pig iron state determination device according to claim 1. The state determination unit compares the ratio of the minimum pixel value to the maximum pixel value with a preset predetermined threshold value or range, and when the ratio is equal to or more than the threshold value or within the range, the mixing is performed. The state is judged to be rich in molten slag,
When the state determination unit determines that the mixture is rich in molten slag, it is determined in advance, from the maximum pixel value and the corresponding relationship between the maximum pixel value and the hot metal temperature, a temperature calculation unit for obtaining the hot metal temperature. To prepare further,
The pig iron state determination device according to claim 1 or 2. An imaging step of imaging the thermal radiance distribution of the tap slag flow as a target image composed of each pixel having a pixel value for each pixel corresponding to the thermal radiance,
A setting step of setting an evaluation area of a predetermined size in the image of the pig-iron flow in the target image captured in the imaging step;
An extraction step of obtaining the maximum pixel value and the minimum pixel value in the evaluation area set in the setting step;
Based on the ratio of the maximum pixel value and the minimum pixel value extracted in the extraction step, comprising a state determination step of determining the mixed state of the hot metal and the molten metal in the molten pig iron flow,
Pigment state determination method.