JP6776180B2 - Hot tap temperature measuring device and its method - Google Patents

Description

The present invention relates to a tap iron temperature measuring device and a tap iron temperature measuring method for measuring the temperature of a tapping slag flowing out from a tapping port.

In a blast furnace from which iron is extracted by heat-treating iron ore, the temperature of the pig iron mixture (hereinafter, abbreviated as "pig iron flow" as appropriate) flowing out from the pig iron outlet of the blast furnace for operation control and the like. However, it is often measured. One of the techniques for measuring the temperature of such a slag flow is disclosed in, for example, Patent Document 1.

The method for measuring the temperature of blast furnace tapping disclosed in Patent Document 1 measures the heat radiation brightness distribution in a region containing the melt flowing out from the metal outlet formed in the blast furnace, and the concentration for each pixel corresponding to the heat radiation brightness. As a density histogram showing the relationship between the density of each pixel and the number of pixels of the image captured by the imaging step and the imaging step of capturing as an image composed of each pixel having a value, the density distribution of hot metal and the molten slag The hot metal concentration distribution peak, which is the concentration that maximizes the number of pixels in the hot metal concentration distribution, with respect to the density histogram creation step of creating a density histogram including the density distribution of The concentration at which the number of pixels is maximized within the search range of the hot metal concentration distribution peak set by the hot metal concentration distribution peak search range setting step and the hot metal concentration distribution peak search range setting step for setting the search range of the hot metal is set. Derivation of hot metal temperature to derive the temperature of hot metal based on the hot metal concentration distribution peak extraction step extracted from the concentration histogram and the hot metal concentration distribution peak concentration extracted by the hot metal concentration distribution peak extraction step as the concentration of the concentration distribution peak. It has a process. Then, in the hot metal concentration distribution peak search range setting step, the hot metal concentration distribution peak concentration, which is the concentration at which the number of pixels is maximized in the hot metal concentration distribution, and the highest concentration in the hot metal slag concentration distribution are set in advance. Search range of the hot metal concentration distribution peak based on the upper and lower limits of the concentration ratio, which is the ratio of the maximum slag concentration, which is the concentration, and the maximum slag concentration in the concentration histogram created by the concentration histogram. Is derived.

Japanese Unexamined Patent Publication No. 2013-160627

By the way, the blast furnace tapping temperature measuring method disclosed in Patent Document 1 can measure the temperature relatively well when the concentration histogram has a bimodal profile including two peaks. However, when actually measured, it is not always possible to obtain a concentration histogram having the bimodal profile, for example, a concentration histogram having a profile that changes gently may be obtained, and it may be difficult to measure the temperature. It was. In particular, in the hot metal slag flow, the hot metal and the slag (molten slag) are mixed, and the translucent slag is placed on the hot metal. Will be the value of. Moreover, since the thickness of the slag on the hot metal 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.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tap iron temperature measuring device and a tapping iron measuring method capable of measuring the temperature of a tapping slag more accurately.

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 tapping temperature measuring device according to one aspect of the present invention uses the heat radiance distribution of the tapping current as a target image composed of each pixel having a pixel value for each pixel corresponding to the heat radiance. An imaging unit to be imaged, a setting unit for setting an evaluation area of a predetermined size in the image of the radiant flow in the target image captured by the imaging unit, and a minimum pixel in the evaluation area set by the setting unit. It includes an extraction unit that extracts a value, and a temperature calculation unit that obtains the hot metal temperature of the hot metal contained in the hot metal flow based on the minimum pixel value extracted by the extraction unit.

In the entire hot metal flow, there is no slag on the hot metal, or even if the slag is on the hot metal, the area where only the hot metal is substantially unaffected by the slag ( It is considered that there is an effective hot metal region). It is thought that the emissivity of the hot metal is about 0.4, while the emissivity of the slag is about 0.9 to 0.95, and the darkest part in the evaluation area of the target image is effective. It seems most certain that it is compared to the hot metal area. The above-mentioned tapping temperature measuring device extracts the minimum pixel value of the evaluation region in the target image of the tapping current, that is, the darkest pixel value (minimum brightness value), and determines the hot metal temperature based on the extracted minimum pixel value. Since the temperature is obtained from the effective hot metal region or the region closest to the effective hot metal region, the hot metal temperature of the hot metal in the hot metal flow can be measured more accurately.

In another aspect, in the above-mentioned tapping temperature measuring device, the extraction unit extracts pixels having a pixel value within a lower fixed ratio in the evaluation region set by the setting unit, and the pixels of the extracted pixels. The average value of the values is obtained as the minimum pixel value.

In such an iron plate temperature measuring device, since the minimum pixel value is obtained by the average value of the pixel values within a certain lower ratio, robustness can be improved, noise immunity is high, and more stable measurement results can be obtained. ..

In another aspect, in these above-mentioned tapping temperature measuring devices, the extraction unit further extracts the maximum pixel value in the evaluation region set by the setting unit, and the temperature calculation unit further extracts the extraction. Based on the maximum pixel value extracted by the unit, the melting temperature of the slag contained in the hot metal slag flow is obtained.

In the entire slag flow, even the slag that rides on the hot metal has a sufficient thickness from the surface, and as a result, when viewed from the surface, only the slag that is not substantially affected by the hot metal is visible. It is considered that (effective slag area) exists, and it is most certain that the brightest part in the evaluation area of the target image is compared to the effective slag area. The tapping temperature measuring device extracts the maximum pixel value of the evaluation region in the target image of the tapping stream, that is, the brightest pixel value (maximum brightness value), and the slag temperature is based on the extracted maximum pixel value. Therefore, since the temperature is obtained from the effective slag region or the region closest to the effective slag region, the slag temperature of the slag in the slag flow can be measured more accurately.

In another aspect, in the above-mentioned tapping temperature measuring device, the extraction unit extracts pixels having a pixel value within a certain upper ratio in the evaluation region set by the setting unit, and extracts the extracted pixels. The average value of the pixel values is obtained as the maximum pixel value.

In such a tapping temperature measuring device, since the maximum pixel value is obtained by the average value of the pixel values within a certain upper ratio, robustness can be improved, noise immunity is high, and more stable measurement results can be obtained. ..

In the tapping temperature measuring method according to another aspect of the present invention, the heat radiance distribution of the tapping stream is set as a target image composed of each pixel having a pixel value for each pixel corresponding to the heat radiance. An imaging step for imaging, a setting step for setting an evaluation region of a predetermined size in the image of the radiant current in the target image captured in the imaging step, and a minimum pixel in the evaluation region set in the setting step. It includes an extraction step of extracting a value and a temperature calculation step of obtaining the hot metal temperature of the hot metal contained in the hot metal slag flow based on the minimum pixel value extracted in the extraction step.

In such a tapping temperature measuring method, the minimum pixel value of the evaluation region in the target image of the tapping current, that is, the darkest pixel value (minimum brightness value) is extracted, and the hot metal is based on the extracted minimum pixel value. Since the temperature is obtained, the temperature is obtained from the effective hot metal region or the region closest to the effective hot metal region, so that the hot metal temperature of the hot metal in the hot metal flow can be measured more accurately.

In another aspect, in the above-mentioned tapping temperature measuring method, the extraction step further extracts the maximum pixel value in the evaluation region set in the setting step , and the temperature calculation step further extracts the extraction step. Based on the maximum pixel value extracted in step 1, the melting temperature contained in the tapping stream is obtained.

In such a tapping temperature measuring method, the maximum pixel value of the evaluation region in the target image of the tapping current, that is, the brightest pixel value (maximum brightness value) is extracted, and melting is performed based on the extracted maximum pixel value. Since the slag temperature is obtained, the temperature is obtained from the effective slag region or the region closest to the effective slag region, so that the slag temperature in the slag flow can be measured more accurately.

The tapping temperature measuring device and the tapping temperature measuring method according to the present invention can measure the temperature of the tapping slag more accurately.

It is a block diagram which shows the structure of the tapping temperature measuring apparatus in embodiment. It is a figure for demonstrating how the tapping slag flow measured by the tapping temperature measuring apparatus flows out. It is a flowchart which shows the operation of the tapping temperature measuring apparatus. It is a figure which shows an example of the target image of the pig iron slag flow. In the target image shown in FIG. 4, as an example, it is a diagram showing a change in brightness on a straight line drawn along the outflow direction. In order to explain the significance of the minimum pixel value and the maximum pixel value in the tapping stream, it is a diagram schematically showing a partial cross section of the tapping stream. It is a figure which shows one measurement example of the said tapping temperature measuring apparatus. It is a figure for demonstrating the modified form of the tapping temperature measuring apparatus.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. It should be noted that the configurations with the same reference numerals in the respective drawings indicate the same configurations, and the description thereof will be omitted as appropriate. In the present specification, when they are collectively referred to, they are indicated by reference numerals without subscripts, and when they refer to individual configurations, they are indicated by reference numerals with subscripts.

FIG. 1 is a block diagram showing a configuration of a tapping temperature measuring device according to an embodiment. FIG. 2 is a diagram for explaining how the tapping slag flow measured by the tapping temperature measuring device flows out.

The pig iron temperature measuring device T in the present embodiment is obtained by imaging the pig iron slag mixture (hereinafter, appropriately abbreviated as “pig iron slag flow”) flowing out from the pig iron outlet of the blast furnace. It is a device that measures the temperature of the tapping slag flow based on the target image of the slag flow. The pig iron slag mixture (pig iron slag flow) is a mixture of hot metal and slag (molten slag), and flows out as a high-temperature fluid from the pig iron outlet of the blast furnace. As shown in FIG. 1, such an iron plate temperature measuring device T includes, for example, an imaging unit 1, a control processing unit 2, and a storage unit 3. In the present embodiment, the input unit 4 and the input unit 4 are further provided. It includes an output unit 5 and an interface unit (IF unit) 6.

The image pickup unit 1 is connected to the control processing unit 2, and according to the control of the control processing unit 2, the thermal radiance distribution of the tapping stream is composed of each pixel having a pixel value for each pixel corresponding to the thermal radiance. It is a device that captures an image as an object image to be imaged. The imaging unit 1 outputs the target image of the tapping current 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 imaging surface, and is arranged so that a light receiving surface is aligned with the imaging surface, and the optical image of the subject is electrically formed. A digital camera or the like including an area image sensor that converts a signal, an image processing circuit that generates image data that is data representing an image of the subject by image processing the output of the area image sensor, and the like. The imaging unit 1 may be a still camera that generates a still image, or a video camera (movie camera) that generates a moving image.

For example, as shown in FIG. 2, the imaging unit 1 can image the outflow spillage PS from the tapping port PH formed in the blast furnace SF to the tapping gutter SG provided with the tapping gutter cover CV. Is appropriately arranged in. Since the tapping stream PS flows out from the tapping port PH at a relatively high speed, the imaging unit 1 is configured to be capable of imaging at a speed corresponding to the flow rate of the tapping stream PS. The imaging unit 1 may be housed in a housing (not shown) together with the other parts 2 to 6 in the pig iron temperature measuring device T, and may be integrally configured with the other parts 2 to 6, but in the present embodiment, the imaging unit 1 is imaged. The unit 1 is configured separately from the other parts 2 to 6, and the imaging unit 1 is arranged remotely from the other parts 2 to 6 so that the pig iron flow PS can be imaged. It is connected to the control processing unit 2 in a communicable manner by wire or wirelessly.

Returning to FIG. 1, the input unit 4 is connected to the control processing unit 2 to measure various commands such as a command for instructing the start of temperature measurement and, for example, a temperature such as a setting input of an evaluation area. It is a device that inputs various necessary data to the tapping temperature measuring device T, and is, for example, a plurality of input switches, a keyboard, a mouse, etc. to which a predetermined function is assigned. The output unit 5 is connected to the control processing unit 2 and outputs commands and data input from the input unit 4 and the temperature measured by the heading temperature measuring device T according to the control of the control processing unit 2. It is a device, for example, a display unit (display device) such as a CRT display, an LCD (liquid crystal display device) and an organic EL display, a printing device such as a printer, and the like.

The IF6 is, for example, a circuit for inputting / outputting data to / from an external device, for example, an interface circuit of RS-232C which is a serial communication method, an interface circuit using the Bluetooth (registered trademark) standard, and USB. (Universal Serial Bus) An interface circuit or the like using the standard. Further, the IF unit 6 may be a communication interface circuit that transmits / receives a communication signal to and from an external device, such as a data communication card or a communication interface circuit according to the IEEE802.11 standard.

The storage unit 3 is a circuit that 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 that controls each unit 1, 3 to 6 of the iron plate temperature measuring device T according to the function of each unit, and an output in a target image captured by the imaging unit 1. A setting program that sets an evaluation area ROI of a predetermined size in an image of a slag stream, and a minimum pixel value (darkest pixel value, minimum brightness value at a value greater than 0) in the evaluation area ROI set by the setting program. ), And a control processing program such as a temperature calculation program for obtaining the hot metal temperature of the hot metal contained in the hot metal current based on the minimum pixel value extracted by the extraction program. In the present embodiment, the extraction program further extracts the maximum pixel value (brightest pixel value, maximum luminance value) in the evaluation area ROI set by the setting program. In the present embodiment, the temperature calculation program further obtains the slag temperature of the slag contained in the slag flow based on the maximum pixel value extracted by the extraction program. The various predetermined data include data necessary for executing each program, such as a target image and calibration information. The storage unit 3 includes, for example, a ROM (Read Only Memory) which is a non-volatile storage element, an EEPROM (Electrically Erasable Programmable Read Only Memory) which is a rewritable non-volatile storage element, and the like. The storage unit 3 includes a RAM (Random Access Memory) or the like that serves as a working memory of the so-called control processing unit 2 that stores data or the like generated during execution of the predetermined program.

Then, the storage unit 3 functionally includes a calibration information storage unit 31 that stores the calibration information. The calibration information is a correspondence relationship between the pixel value of the image obtained by imaging the so-called blackbody furnace with the imaging unit 1 and the brightness value of the blackbody radiance of the blackbody furnace, and is different from each other, for example. It is created in advance by photographing the blackbody furnace with the imaging unit 1 at each of a plurality of temperatures. Since the brightness value of the blackbody radiance is a function of temperature, the calibration information includes the pixel value of the image obtained by imaging the blackbody furnace with the imaging unit 1 and the temperature of the blackbody furnace. It becomes a correspondence relationship of. For example, a luminance image of thermal radiance, that is, a temperature image can be generated by converting each pixel value of each pixel in the target image into each luminance value by the calibration information. The calibration information may be stored in the calibration information storage unit 31 in the form of a relational expression representing the correspondence relationship, or may be stored in the calibration information storage unit 31 in the form of a table representing the correspondence relationship.

The control processing unit 2 is a circuit for controlling each unit 1, 3 to 6 of the tapping temperature measuring device T according to the function of each unit and obtaining the temperature. The control processing unit 2 includes, for example, a CPU (Central Processing Unit) and peripheral circuits thereof. The control processing unit 2 functionally includes a control unit 21, a setting unit 22, an extraction unit 23, and a temperature calculation unit 24 when the control processing program is executed.

The control unit 21 controls each unit 1, 3 to 6 of the tap iron temperature measuring device T according to the function of each unit, and controls the entire tapping iron temperature measuring device T.

The setting unit 22 sets an evaluation region ROI of a predetermined size in the image of the tapping current in the target image captured by the imaging 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 in the input unit 4, and set the evaluation area ROI in the image of the tapping flow in the target image. Alternatively, the setting unit 22 may automatically set the evaluation area ROI in, for example, the image of the tapping current in the target image. More specifically, for example, the setting unit 22 first detects the edge of the image region of the heading current in the target image by using an edge filter, thereby determining the image region of the heading current in the target image. Extract. Then, the setting unit 22 sets the evaluation region ROI of the predetermined size in the image region of the tapping stream in the extracted target image. For example, from the viewpoint of measuring the temperature of the pig iron flow PS for the purpose of operating control of the blast furnace, or from the viewpoint that the imaging of the pig iron flow PS is hindered by the smoke generated as the distance from the pig iron outlet PH increases. The setting unit 22 sets the evaluation region ROI at a position in the image of the tapping slag flow where the influence of slag accumulation, smoke, etc. near the tapping port is as small as possible. The size of the evaluation region ROI is appropriately set using a plurality of samples, and is, for example, about 2 / of the width of the image region of the tapping flow (the length in the width direction substantially orthogonal to the outflow direction). It is set by a square or rectangle having a length of 3 or about 1/2.

The extraction unit 23 extracts the minimum pixel value (darkest pixel value, minimum luminance value at a value larger than 0) in the evaluation region ROI set by the setting unit 22. Further, in the present embodiment, the maximum pixel value (brightest pixel value, maximum luminance value) in the evaluation area ROI set by the setting unit 22 is extracted.

The temperature calculation unit 24 obtains the hot metal temperature of the hot metal contained in the hot metal slag flow based on the minimum pixel value extracted by the extraction unit 23. Further, in the present embodiment, the temperature calculation unit 24 obtains the slag temperature of the slag contained in the tapping slag flow based on the maximum pixel value extracted by the extraction unit 23. More specifically, the temperature calculation unit 24 converts the minimum pixel value extracted by the extraction unit 23 into a brightness value of thermal radiance by using the calibration information stored in the calibration information storage unit 31 of the storage unit 3. It is converted and the temperature is obtained as the hot metal temperature. Similarly, the temperature calculation unit 24 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 smelting temperature.

The calibration information is a value obtained by using a blackbody furnace as described above. Since the pig iron slag flow of the implementation is not a blackbody, there is an error accordingly. Therefore, the temperature calculation unit 24 may obtain the hot metal temperature and the slag temperature by correcting the error, for example, as disclosed in Patent Document 1.

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 computer such as a desktop type or a node type.

Next, the operation of this embodiment will be described. FIG. 3 is a flowchart showing the operation of the tapping temperature measuring device. FIG. 4 is a diagram showing an example of a target image of the pig iron slag flow. FIG. 5 is a diagram showing a change in brightness on a straight line drawn along the outflow direction as an example in the target image shown in FIG. The horizontal axis of FIG. 5 is the distance represented by the number of pixels, and the vertical axis thereof is the pixel value represented by the brightness. FIG. 6 is a diagram schematically showing a partial cross section of the tapping stream in order to explain the significance of the minimum pixel value and the maximum pixel value in the tapping stream.

When the power is turned on, the tapping temperature measuring device T having such a configuration executes necessary initialization of each part and starts its operation. By executing the control processing program, the control processing unit 2 is functionally configured with a control unit 21, a setting unit 22, an extraction unit 23, and a temperature calculation unit 24.

Then, in evaluating the temperature of the tapping flow, in FIG. 3, the tapping temperature measuring device T flows out from the tapping port PH formed in the blast furnace SF by the control processing unit 2 in the imaging unit 1. The pig iron flow PS is imaged, and a target image including the image of the pig iron flow PS is acquired (S11).

Next, the tap iron temperature measuring device T uses the setting unit 22 of the control processing unit 2 to set an evaluation region of a predetermined size in the image of the tapping slag flow in the target image captured by the imaging unit 1 in the processing 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 execution of the process S11 acquires the target image PO shown in FIG. 4, and the execution of the process S12 sets the evaluation region ROI indicated by a square in the image PP of the tapping flow in the target image PO. .. The image PP of the slag flow in the target image PO has a so-called marble pattern due to the difference between the emissivity of the hot metal and the emissivity of the slag and the mixed state thereof.

Next, the tapping temperature measuring device T uses the extraction unit 23 of the control processing unit 2 to set the minimum pixel value (the darkest pixel value, a value larger than 0) in the evaluation region ROI set by the setting unit 22 in the processing S12. (Minimum luminance value) and maximum pixel value (brightest pixel value, maximum luminance value) are extracted (S13).

Next, the tapping temperature measuring device T is included in the tapping flow based on the minimum pixel value and the maximum pixel value extracted by the extraction unit 23 in the processing S13 by the temperature calculation unit 24 of the control processing unit 2. The hot metal temperature and the hot metal slag temperature of the hot metal and the slag are obtained (S14). More specifically, the temperature calculation unit 24 converts the minimum pixel value extracted by the extraction unit 23 into a brightness value of thermal radiance by using the calibration information stored in the calibration information storage unit 31 of the storage unit 3. It is converted and the temperature is obtained as the hot metal temperature. Then, the temperature calculation unit 24 converts the extracted maximum pixel value into a brightness value of thermal radiance by using the calibration information, and obtains the temperature as the melting temperature.

Then, the hot metal temperature measuring device T outputs the hot metal temperature and the hot metal temperature obtained by the temperature calculation unit 24 in the processing S14 to the outside from the output unit 5 (S15) by the control unit 21, and ends the processing. .. If necessary, the control unit 21 may output each of the obtained hot metal temperature and the slag temperature from the IF unit 6 to an external device.

Each of the above-mentioned processes for obtaining the hot metal temperature and the hot water temperature in such a hot metal slag flow performs a plurality of frames at predetermined time intervals during the operation of the blast furnace SF, for example, when the imaging unit 1 generates a moving image. Every other time, it is executed repeatedly, and the hot metal temperature and the hot water temperature in the hot metal slag flow are monitored.

In the hot metal slag flow, the hot metal and the slag are mixed. For example, as shown in FIGS. 6A and 6B, a translucent slag is placed on the hot metal, so that the hot metal seen from the surface of the hot metal slag flow. The emissivity of is an apparent value. Moreover, since the thicknesses D11, D12, and D2 of the slag on the hot metal are usually different for each place (region), the apparent emissivity also changes for each place (region), and the temperature is further measured. Is difficult. However, in the entire hot metal slag flow, even if the slag does not get on the hot metal, or even if the slag is on the hot metal, it looks like only the hot metal that is not substantially affected by the slag. It is considered that there is a region (effective hot metal region). While the emissivity of the hot metal is about 0.4, the emissivity of the slag is about 0.9 to 0.95, so the darkest part in the evaluation area of the target image is compared with the effective hot metal area. It seems most certain to decide. FIG. 5 is a diagram showing a change in luminance on a straight line drawn along the outflow direction as an example in the luminance image shown in FIG. In the example shown in FIG. 5, the graph showing the change in brightness is the minimum at each of P1 near 80pixel and P2 near 105pixel, but the minimum value of P1 near 80pixel and the minimum value of P2 near 105pixel are about 10%. It's different. Since the time difference between these two points is only 1 ms or less from the flow velocity of the hot metal slag flow PH, it is unlikely that the temperature will drop sharply in this minute time, and this difference in brightness is due to the melting on the hot metal. It is considered that the thickness of the slag is different and the influence of the slag is different. Therefore, the darkest part shows the true value of the hot metal temperature, or information close to the true value, which is not affected by the slag or has the least influence of the slag.

The tapping temperature measuring device D in the present embodiment and the tapping temperature measuring method implemented therein obtain the minimum pixel value of the evaluation region in the target image of the tapping current, that is, the darkest pixel value (minimum brightness value). Since the hot metal temperature is obtained based on the extracted minimum pixel value, the hot metal temperature is obtained from the effective hot metal region or the region closest to the effective hot metal region. Can be measured.

On the other hand, as shown in FIG. 6B, for example, as shown in FIG. 6B, even the slag that rides on the hot metal has a sufficient thickness D2 from the surface in the entire hot metal slag flow, and as a result, when viewed from the surface, the hot metal is substantially said. It is considered that there is a region (effective slag area) that can be seen only in the slag that is not affected by the above, and it is most certain that the brightest part in the evaluation area of the target image is compared to the effective slag area. That is, the brightest part indicates the true value of the slag temperature, or information close to the true value, which is not affected by the hot metal or has the least influence of the hot metal.

The tapping temperature measuring device D and the tapping temperature measuring method extract the maximum pixel value of the evaluation region in the target image of the tapping stream, that is, the brightest pixel value (maximum brightness value), and the extracted maximum pixel. Since the slag temperature is obtained based on the value, the temperature is obtained from the effective slag region or the region closest to the effective slag region, so that the slag temperature in the slag flow can be measured more accurately.

The result of one measurement example is shown in FIG. FIG. 7 is a diagram showing a measurement example of the tapping temperature measuring device. The horizontal axis of FIG. 7 is time, the left vertical axis thereof is a pixel value (brightness), and the right vertical axis thereof is a ratio value. The horizontal axis is about 2.4 seconds per scale (about 40 minutes x 60) /1000 = 2.4). From top to bottom, each graph shown in FIG. 7 shows the first graph showing the time change of the maximum pixel value, the second graph showing the time change of the minimum pixel value, and the minimum pixel value at the same time with the maximum pixel value. It is a 3rd graph which shows the time change of the divided ratio. As can be seen from FIG. 7, although the maximum pixel value and the minimum pixel value change with time, the ratio (= minimum pixel value / maximum pixel value) is a substantially constant value within a certain range. Therefore, since the ratio (= minimum pixel value / maximum pixel value) corresponding to the radiation ratio is kept substantially constant, it is considered that the hot metal temperature and the slag temperature are appropriately obtained.

In the above-described embodiment, the temperature of the tapping flow is measured by imaging the tapping flow from one direction with one imaging unit 1, but the horizontal direction perpendicular to the tapping flow and the temperature of the tapping flow are measured. Each temperature of the tapping current may be measured by taking an image with each of the two imaging units 1 from two directions in the vertical direction and observing from these two directions.

Further, in the above-described embodiment, the extraction unit 23 extracts pixels having pixel values within a certain lower ratio in the evaluation region ROI set by the setting unit 22, and calculates the average value of the pixel values of the extracted pixels. It is obtained as the minimum pixel value, and the temperature calculation unit 24 may obtain the hot metal temperature of the hot metal contained in the hot metal flow based on the obtained minimum pixel value. Similarly, the extraction unit 23 extracts pixels having pixel values within a certain upper ratio in the evaluation area ROI set by the setting unit 22, and obtains the average value of the pixel values of the extracted pixels as the maximum pixel value. The temperature calculation unit 24 may obtain the melting temperature of the slag contained in the slag flow based on the obtained maximum pixel value.

FIG. 8 is a diagram for explaining a modified form of the tapping temperature measuring device. The horizontal axis of FIG. 8 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, one example is the graph shown in FIG. In the above-described embodiment, in the example shown in FIG. 8, the hot metal temperature was obtained based only on the minimum pixel value min, but in this modified form, pixels having a pixel value X1 within a lower fixed ratio are extracted, and the pixels are extracted. The average value of the pixel values of the extracted pixels is regarded as the minimum pixel value, and the hot metal temperature is obtained based on the minimum pixel value of this average value. The lower fixed ratios are, 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 are set as appropriate. Similarly, in the above-described embodiment, in the example shown in FIG. 8, the melting temperature was obtained based only on the maximum pixel value max, but in this modified form, the pixels having the pixel value X2 within a certain upper ratio are It is extracted, and the average value of the pixel values of the extracted pixels is regarded as the maximum pixel value, and the smelting temperature is obtained based on the maximum pixel value of this average value. The top fixed percentages are, for example, 10%, 7%, 5%, 3%, 1%, the percentage corresponding to the top 10, the percentage corresponding to the top 5, and the percentage corresponding to the top 3. Etc., and are set as appropriate.

Since the tapping temperature measuring device D and its method in such a modified form use the above-mentioned average value, robustness can be improved, noise immunity is high, and more stable measurement results can be obtained.

In order to express the present invention, the present invention has been appropriately and sufficiently described through the embodiments with reference to the drawings above, but those skilled in the art can easily change and / or improve the above embodiments. It should be recognized that it can be done. Therefore, unless the modified or improved form implemented by a person skilled in the art is at a level that deviates from the scope of rights of the claims stated in the claims, the modified form or the improved form is the scope of rights of the claims. It is interpreted as being included in.

T tap iron temperature measuring device ROI evaluation area 1 Imaging unit 2 Control processing unit 3 Storage unit 21 Control unit 22 Setting unit 23 Extraction unit 24 Temperature calculation unit 31 Calibration information storage unit

Claims (6)

An imaging unit that captures the thermal radiance distribution of the spillage 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 heading and slag flow in the target image captured by the imaging unit, and a setting unit.
An extraction unit that extracts the minimum pixel value in the evaluation area set by the setting unit, and an extraction unit.
A temperature calculation unit for obtaining the hot metal temperature of the hot metal contained in the hot metal slag flow based on the minimum pixel value extracted by the extraction unit is provided.
Hot metal temperature measuring device. The extraction unit extracts pixels having pixel values within a certain lower ratio in the evaluation region set by the setting unit, and obtains an average value of the pixel values of the extracted pixels as the minimum pixel value.
The tapping temperature measuring device according to claim 1. The extraction unit further extracts the maximum pixel value in the evaluation region set by the setting unit.
The temperature calculation unit further obtains the slag temperature of the slag contained in the tapping slag flow based on the maximum pixel value extracted by the extraction unit.
The tapping temperature measuring device according to claim 1 or 2. The extraction unit extracts pixels having pixel values within a certain percentage of the top in the evaluation region set by the setting unit, and obtains the average value of the pixel values of the extracted pixels as the maximum pixel value.
The tapping temperature measuring device according to claim 3. An imaging process in which the thermal radiance distribution of the spillage is imaged 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 region of a predetermined size in the image of the tapping stream in the target image captured in the imaging step, and a setting step.
An extraction step of extracting the minimum pixel value in the evaluation region set in the setting step , and
A temperature calculation step for obtaining the hot metal temperature of the hot metal contained in the hot metal slag flow based on the minimum pixel value extracted in the extraction step is provided.
How to measure the tapping temperature. The extracting step further extracts the maximum pixel value in the evaluation region set in the setting step,
The temperature calculation step further obtains the slag temperature contained in the tapping stream based on the maximum pixel value extracted in the extraction step .
The method for measuring the tapping temperature according to claim 5.

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