JP2019183224A - Furnace throat pressure setting system, furnace throat pressure setting method and program - Google Patents

Abstract

To detect accurately and reliably a pressure at a furnace throat of a converter (furnace throat pressure).SOLUTION: The furnace throat pressure setting device 100 derives a three-dimensional velocity vector of airflow in a boundary region based on a result of image processing of a camera image taken by an imaging device 200a, 200b, extracts a boundary region feature value corresponding to a derived three-dimensional velocity vector from a data storage unit 405, and derives a furnace throat pressure P0(t1+Δt) included in an extracted feature value as a current value of the furnace throat pressure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a furnace port pressure setting system, a furnace port pressure setting method, and a program, and is particularly suitable for use in detecting pressure at a furnace port of a converter.

  In the converter, after charging molten steel as the main raw material, quick lime as auxiliary material is charged and oxygen is blown into the furnace to oxidize and remove carbon, silicon, phosphorus, etc. contained in the molten steel. To do. At that time, a large amount of exhaust gas rich in CO component is generated along with the decarburization reaction. The exhaust gas with a high CO concentration is recovered as a valuable gas, and the exhaust gas with a low CO concentration is burned at the top through a chimney and released into the atmosphere.

  After the start of the exhaust gas recovery, the pressure at the furnace port of the converter (in the following description, this pressure is referred to as the furnace port pressure as necessary) is detected in order to increase the CO gas recovery efficiency. Then, the furnace port pressure is controlled by using the damper opening as an operation amount so that the furnace port pressure becomes equal to a target value (generally, external pressure). For this control, for example, feedback control such as PI control is used. The reason why such control is performed is that if the furnace port pressure is higher than the outside air pressure, exhaust gas flows out of the furnace through the gap between the furnace port and the skirt, resulting in CO gas loss. Conversely, if the furnace port pressure is lower than the outside air pressure, the outside air flows into the furnace, the CO gas in the furnace reacts with the oxygen in the outside air, and the CO gas burns, which is also a loss of CO gas. Become.

There exists a technique of patent document 1 as a technique which detects the furnace port pressure of such a converter.
Patent Document 1 describes that an amount of a combustion flame is derived by capturing an image of a furnace port of a converter and performing image processing, and an opening degree of a damper is determined according to the derived amount of the combustion frame. Has been.

JP-A-1-165712

"FlowMaster 3D PIV Stereo PIV System FlowMaster PIV (Japanese)", Nippon Kanomax Co., Ltd., [online], [searched on September 19, 2017], Internet <URL: http://www.kanomax.co.jp /product/index_0076.html>

  However, in the technique described in Patent Document 1, the number of pixels whose luminance of the image of the furnace port of the converter is equal to or higher than a threshold is derived as the amount of the combustion frame. Therefore, if the combustion frame is blocked by the smoke containing dust generated in the converter, there is a possibility that an image of the combustion frame cannot be accurately captured. As described above, the technique described in Patent Document 1 has a problem that the pressure (furnace port pressure) at the furnace port of the converter cannot be detected accurately and reliably.

  The present invention has been made in view of the above problems, and an object thereof is to accurately and reliably detect the pressure (furnace port pressure) at the furnace port of a converter.

  The furnace port pressure setting system of the present invention is a boundary that is visible when the converter is viewed from the outside, and is a boundary that includes a boundary between the converter and a skirt disposed above the converter. A velocity vector deriving unit for deriving a velocity vector of the air flow in the boundary region based on a captured image of the region, and a pressure at the furnace port of the converter based on the velocity vector derived by the velocity vector deriving unit. Furnace port pressure deriving means for deriving the furnace port pressure, and storage means for preliminarily storing boundary region feature quantities including the velocity vector of the air flow in the boundary region and the furnace port pressure corresponding to the velocity vector. The furnace port pressure deriving means corresponds to the speed vector derived by the speed vector deriving means from the furnace port pressure stored by the storage means. Reads the mouth pressure, based on the furnace outlet pressure reading, characterized in that it derives the current value of the furnace opening pressure.

  The furnace port pressure setting method of the present invention is a boundary that is visible when the converter is viewed from the outside, and is a boundary that includes a boundary between the converter and a skirt disposed above the converter. A velocity vector deriving step for deriving a velocity vector of an air flow in the boundary region based on a captured image of the region, and a furnace port pressure that is a pressure at a furnace port of the converter, which is derived by the velocity vector deriving step. A boundary region feature amount including a furnace port pressure deriving step for deriving a furnace port pressure corresponding to the velocity vector, a velocity vector of an air flow in the boundary region, and the furnace port pressure corresponding to the velocity vector; Storing in advance for each state of the airflow direction and the bias in the region, and the furnace port pressure deriving step includes the furnace port pressure stored in the storage step, Reading the furnace outlet pressure corresponding to the velocity vector derived by serial velocity vector derivation step, based on the furnace outlet pressure reading, characterized in that it derives the current value of the furnace opening pressure.

  The program of the present invention causes a computer to function as each means of the furnace port pressure setting system.

  ADVANTAGE OF THE INVENTION According to this invention, the pressure (furnace port pressure) of the furnace port part of a converter can be detected correctly and reliably.

FIG. 1 is a diagram illustrating an example of a configuration of a converter facility. FIG. 2 is a diagram illustrating an example of the arrangement of the imaging device and the laser device. FIG. 3 is a diagram illustrating an example of an irradiation region of laser light. FIG. 4 is a diagram illustrating an example of a functional configuration of the furnace port pressure setting device. FIG. 5 is a diagram illustrating an example of a state in which the state of the airflow from the boundary region toward the outside of the converter differs between the camera installation side and the camera non-installation side. FIG. 6 is a diagram illustrating an example of a state in which the state of the airflow from the outside of the converter toward the boundary region differs between the camera installation side and the camera non-installation side. FIG. 7 is a diagram illustrating an example of the boundary area feature amount stored in the data storage unit. FIG. 8 is a flowchart for explaining an example of the furnace port pressure setting method.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Converter equipment)
FIG. 1 is a diagram illustrating an example of a configuration of a converter facility. Here, description will be made centering on the equipment for recovering the exhaust gas from the converter 1 as the converter equipment.
In FIG. 1, first, main raw materials such as hot metal and scrap are charged into the converter 1, and then auxiliary materials such as quick lime are charged into the converter 1 from the auxiliary raw material inlets 2 a to 2 c. Then, oxygen is blown from a lance (not shown) extending along the axis of the converter 1 inside the converter 1, and inert gas, carbon dioxide gas, pure oxygen gas, and cooling gas are introduced into the furnace from the bottom of the furnace. The main raw material to which the auxiliary raw material is added is agitated. Thereby, carbon, silicon, phosphorus, etc. contained in the main raw material are oxidized and removed. By this oxidation reaction, slag in which silicon, phosphorus or the like is taken in is generated on the upper part of the main raw material. After discharging this slag, the molten steel from which impurities have been removed is produced. It should be noted that the direction in which the converter 1 is tilted at the time of discharge is opposite to the direction in which the converter 1 is tilted at the time of steel output.

  A hood 3 is disposed above the converter 1 in an upright state. A skirt 4 is disposed on the outer peripheral surface of the hood 3. The skirt 4 moves in the height direction (vertical direction) of the converter 1 in an upright state. The skirt height meter 5 is a device that measures the height of the skirt 4. The skirt height meter 5 is, for example, the height of the predetermined position of the skirt 4 when the predetermined position of the skirt 4 when the skirt 4 is at the lowest position is set as a reference position (0 (zero)). Measure.

Exhaust gas is generated by the oxidation reaction described above. The exhaust gas is sucked by an IDF (Induced Draft Fan) 6. The rotational speed of the IDF 6 is measured by the rotational speed meter 7.
After passing through the skirt 4 and the hood 3, the exhaust gas is sent to the dust collector 8 through the exhaust gas duct. The exhaust gas component is analyzed by an exhaust gas analyzer 9 disposed at the top of the furnace in front of the dust collector 8.
The furnace port pressure gauge 10 is a device that measures the pressure (furnace port pressure) at the furnace port 1 a of the converter 1. Since the furnace port pressure gauge 10 cannot be disposed at the position of the furnace port 1a, the furnace port pressure gauge 10 measures the pressure at a position above the furnace port 1a as the furnace port pressure. Therefore, the furnace port pressure gauge 10 measures the furnace port pressure in a state where a time delay has occurred (relative to the actual furnace port pressure). That is, the furnace port pressure measured at a certain time by the furnace port pressure gauge 10 is actually the furnace port pressure at a time before the time.

  The exhaust gas that has exited the dust collector 8 travels toward the IDF 6 through the damper 11. The opening meter 12 is a device that measures the opening of the damper 11. The opening degree of the damper 11 is operated by the control device 400 so that the furnace port pressure becomes equal to a target value (generally, the external atmospheric pressure). In the region between the damper 11 and the IDF 6, the exhaust gas flow meter 13 measures the flow rate of the exhaust gas. Further, a damper 14 is disposed between the IDF 6 and the measurement region of the exhaust gas flow rate by the exhaust gas flow meter 13, and the opening degree of the damper 14 is measured by the opening meter 15. The opening degree of the damper 14 is operated by the control device 400 so that the furnace port pressure becomes a target value (generally, the external pressure).

The exhaust gas analyzer 17 is an apparatus that analyzes components of exhaust gas that has exited the IDF 6. The three-way switch 18 operates the three-way valve 19 to guide the exhaust gas exiting the IDF 6 in either the chimney 20 or the gas holder 21. As a result of the analysis by the exhaust gas analyzer 17, when the concentrations of O ₂ and CO contained in the exhaust gas meet predetermined concentration conditions, the control device 400 guides the exhaust gas that has exited the IDF 6 toward the gas holder 21. The three-way switch 18 is instructed. In accordance with this instruction, the three-way switch 18 operates the three-way valve 19 to guide the exhaust gas that has exited the IDF 6 toward the gas holder 21. On the other hand, when the concentrations of O ₂ and CO contained in the exhaust gas do not meet the predetermined concentration conditions, the control device 400 instructs the three-way switch 18 to guide the exhaust gas exiting the IDF 6 toward the chimney 20. . In accordance with this instruction, the three-way switch 18 operates the three-way valve 19 to guide the exhaust gas exiting the IDF 6 toward the chimney 20.

The water seal check device 22 is disposed between the three-way valve 19 and the gas holder 21. The water seal valve 23 is disposed between the water seal checker 22 and the gas holder 21. As a result of the analysis by the exhaust gas analyzer 17, when the concentrations of O ₂ and CO contained in the exhaust gas meet predetermined concentration conditions, the control device 400 instructs to open the path toward the gas holder 21. The water seal check device 22 and the water seal valve 23 open the path toward the gas holder 21 in accordance with this instruction. The water seal check device 22 and the water seal valve 23 block the path toward the gas holder 21 when this instruction is not given.

The control device 400 inputs the measurement values of each measuring instrument, gives various instructions including the above-described instructions, and performs overall control of the converter equipment. In addition, since control of the converter equipment by the control apparatus 400 is implement | achieved by a well-known technique, the detailed description is abbreviate | omitted here.
However, in the present embodiment, when the control device 400 controls the furnace port pressure by operating the dampers 11 and 14, the control device 400 uses the furnace port pressure setting device 100 instead of the furnace port pressure measured by the furnace port pressure gauge 10. Use the set furnace port pressure.

Moreover, if the converter equipment has the converter 1 and the skirt 4, various known structures can be adopted.
However, in the present embodiment, two imaging devices 200 a and 200 b that image a region including the boundary between the converter 1 and the skirt 4 that are visible when the converter 1 is viewed from the outside are disposed. In the following description, this area is referred to as a boundary area as necessary. Further, in order to form sheet light that becomes an imaging surface of the imaging devices 200a and 200b, a laser device 300 that emits laser light from above is arranged toward the boundary region.

  FIG. 2 is a diagram illustrating an example of the arrangement of the imaging devices 200 a and 200 b and the laser device 300. In each figure, the X, Y, and Z coordinates indicate the relationship of the orientation of each figure, and those marked with ● indicate the direction from the back side to the near side of the page, and ○ Those marked with x indicate the direction from the near side to the far side of the page.

  As described above, the direction in which the converter 1 is tilted at the time of discharge is opposite to the direction in which the converter 1 is tilted at the time of steel output. In the example shown in FIG. 2, at the time of evacuation, the converter 1 is rotated and tilted in the counterclockwise direction toward the paper surface (the direction indicated as “the tilting direction during evacuation” in FIG. 2). On the other hand, at the time of steel output, the converter 1 is rotated and tilted in the clockwise direction (the direction indicated as “tilting direction at the time of steel output” in FIG. 2) toward the paper surface. In the following description, the direction in which the converter 1 is inclined at the time of discharge is referred to as the tilting direction at the time of discharge, and the direction in which the converter 1 is inclined at the time of steel output is referred to as the tilting direction at the time of steel output.

  It is desirable that the imaging devices 200a and 200b and the laser device 300 have a configuration for cooling so that even when a high-temperature furnace gas is ejected from the furnace port portion of the converter 1 and exposed to the high-temperature gas, the imaging devices 200a and 200b and the laser device 300 can operate normally. . For example, a case of a heat insulating material or a water cooling pipe can be disposed around the imaging devices 200a and 200b and the laser device 300 so that imaging and laser light emission are not hindered. Moreover, since the exhaust gas duct is generally installed in the upper direction (the positive direction of the Z axis) on the tilting direction side (the positive direction side of the X axis) than the skirt 4, the converter 1 Further, on the tilting direction side during steel output, the installation space for the imaging devices 200a and 200b and the laser device 300 is limited due to the equipment configuration. Therefore, in the present embodiment, as shown in FIG. 2, the imaging devices 200 a and 200 b and the laser device 300 are arranged on the side of the tilting direction at the time of discharge from the converter 1, and the tilting direction at the time of steel output from the converter 1. Do not place on the side.

FIG. 3 is a diagram for explaining an example of an irradiation region of laser light by the laser device 300.
In FIG. 3, the illustration of the skirt 4 is omitted for convenience of description. As shown in FIG. 2 and FIG. 3, the laser device 300 is a sheet-like laser from above toward a boundary region generated on the side of the converter 1 tilting direction when the converter 1 is standing upright. Light (sheet light 310) is emitted. The sheet light 310 becomes (part of) an imaging region of the imaging devices 200a and 200b. The imaging devices 200a and 200b are arranged at positions where the regions including the overlapping regions among the boundary regions irradiated with the sheet light 310 can be imaged from different directions. In the present embodiment, the imaging devices 200a and 200b are arranged such that their optical axes intersect in an area of the boundary area that is irradiated with the sheet light 310, and image the boundary area and surrounding areas from different directions. To do. The imaging devices 200a and 200b may capture a still image or a moving image. In addition, in the following description, the tilting direction side (the negative direction side of the X axis) of the converter 1 from the axis A of the converter 1 is referred to as a camera installation side as necessary, and the steel is output from the converter 1 axis. The time tilt direction side (the positive direction side of the X axis) is referred to as a camera non-installation side as necessary.
As described above, in the embodiment, the imaging devices 200a and 200b and the laser device 300 are arranged with respect to a known converter facility.

(Reactor port pressure setting device 100)
FIG. 4 is a diagram illustrating an example of a functional configuration of the furnace port pressure setting device 100. The hardware of the furnace port pressure setting device 100 is realized by using, for example, an information processing device having a CPU, ROM, RAM, HDD, and various interfaces, or dedicated hardware. The furnace port pressure setting device 100 estimates the current value of the furnace port pressure and outputs it to the control device 400 by using images captured by the imaging devices 200a and 200b during the period when the furnace port pressure is controlled by the control device 400. To do. As described above, in the present embodiment, the control device 400 is configured so that the furnace port pressure output from the furnace port pressure setting device 100 is equal to the target value, not the furnace port pressure measured by the furnace port pressure gauge 10. The opening degree of the dampers 11 and 14 is operated. Below, an example of the function which the furnace port pressure setting apparatus 100 has is demonstrated.

<Image acquisition unit 401>
The image acquisition unit 401 acquires images captured by the imaging devices 200 a and 200 b during a period when the furnace port pressure is controlled by the control device 400. The period in which the furnace port pressure is controlled by the control device 400 is a period in which the exhaust gas generated from the converter 1 is collected. In the following description, images captured by the imaging devices 200a and 200b are referred to as camera images as necessary. The image acquisition unit 401 acquires images captured at three times t1, t2, and t3 from the imaging devices 200a and 200b as camera images. This is because, as will be described later, camera images captured at three times t1, t2, and t3 are necessary to capture changes in the airflow in the boundary region. When the imaging devices 200a and 200b continuously capture still images, for example, three images that are continuously captured are images captured at three times t1, t2, and t3. When the imaging devices 200a and 200b continuously shoot moving images, for example, images of three consecutive frames become images captured at three times t1, t2, and t3.

<Speed vector deriving unit 402>
The velocity vector deriving unit 402 performs image processing on the camera image acquired by the image acquiring unit 401, and derives a three-dimensional velocity vector (absolute value and direction of the velocity of the airflow) in the boundary region. . Since the derivation of the three-dimensional velocity vector of the air current can be realized by a known technique as described in Non-Patent Document 1, only the outline is described here, and the detailed description thereof is omitted. .
First, the velocity vector deriving unit 402 divides images (camera images) captured at three times t1, t2, and t3 by the imaging device 200a into a plurality of divided regions. Similarly, the velocity vector deriving unit 402 also divides images (camera images) captured at three times t1, t2, and t3 by the imaging device 200b into a plurality of divided regions, respectively. The velocity vector deriving unit 402 identifies the region of the airflow that is displayed in the divided regions corresponding to each other of the images (camera images) captured at the three times t1, t2, and t3 by the imaging devices 200a and 200b. By tracking the change in the region, the three-dimensional velocity vector of the airflow in the divided region is derived. The velocity vector deriving unit 402 performs the derivation of the three-dimensional velocity vector of the airflow for all the divided regions. Note that the times t1, t2, and t3 at which the images (camera images) captured by the imaging device 200a are captured and the times t1, t2, and t3 at which the images (camera images) captured by the imaging device 200b are captured are the same time. Suppose that

  The velocity vector deriving unit 402 includes the three-dimensional velocity of the airflow in the corresponding divided region among the three-dimensional velocity vectors of the airflow in each divided region obtained from the images (camera images) captured by the imaging devices 200a and 200b. Based on the vector and the positional relationship between the imaging devices 200a and 200b and the sheet light 310, a three-dimensional velocity vector of the airflow in the divided region is derived. Such derivation of the three-dimensional velocity vector is performed for all the divided regions corresponding to each other of the images (camera images) captured by the imaging devices 200a and 200b, so that the three-dimensional velocity vector of the airflow in each divided region is obtained. Derived.

  The velocity vector deriving unit 402 derives the three-dimensional velocity vector of the airflow in the boundary region based on the three-dimensional velocity vector of the airflow in each divided region derived as described above. For example, the velocity vector deriving unit 402 derives, as a three-dimensional velocity vector of the airflow in the boundary region, a three-dimensional velocity vector of the airflow in one certain divided region set as a region representing the boundary region among the divided regions. can do. Further, the velocity vector deriving unit 402 can derive the sum of the three-dimensional velocity vectors of the airflow in each divided region as the three-dimensional velocity vector of the airflow in the boundary region. In the following description, the three-dimensional velocity vector of the airflow in the boundary region becomes a positive direction when going from the boundary region (the region of the gap between the converter 1 and the skirt 4) to the outside of the converter 1 (outside air). The negative direction is assumed when going from the outside (to the outside air) of the converter 1 to the boundary region (region of the gap between the converter 1 and the skirt 4).

<Skirt height acquisition unit 403>
The skirt height acquisition unit 403 acquires the current value of the height of the skirt 4 based on the measurement result of the skirt height meter 5. The skirt height acquisition unit 403 may periodically and repeatedly acquire the measurement value of the height of the skirt 4 from the skirt height meter 5, or the skirt 4 after the change when the height of the skirt 4 is changed. The measured value of the height may be obtained from the skirt height meter 5.

<Data extraction unit 404, data storage unit 405>
Generally, when the direction of the three-dimensional velocity vector of the airflow in the boundary region is a positive direction (the direction from the boundary region toward the outside of the converter 1), the absolute value of the magnitude of the three-dimensional velocity vector is larger. It can be said that the furnace port pressure is high. Similarly, when the direction of the three-dimensional velocity vector of the airflow in the boundary region is a negative direction (direction from the outside of the converter 1 toward the boundary region), the absolute value of the size of the three-dimensional velocity vector is large. It can be said that the furnace port pressure is low.

However, there are cases where deposits such as bullion adhere to the edge of the furnace port 1a by repeating blowing and exhausting. Then, the state of the edge of the furnace port 1a is the camera installation side (tilting direction side at the time of discharge, the negative direction side of the X axis) and the camera non-installation side (tilting direction at the time of steel output, positive direction side of the X axis). It will be different. Thereby, the absolute value of the magnitude of the three-dimensional velocity vector of the airflow in the boundary region does not directly correspond to the furnace port pressure. This will be described below.
FIG. 5 is a diagram illustrating an example of a state in which the state of the airflow from the boundary region toward the outside of the converter 1 is different between the camera installation side and the camera non-installation side. FIG. 6 is a diagram illustrating an example in which the state of the airflow from the outside of the converter 1 toward the boundary region differs between the camera installation side and the camera non-installation side.

  The left side of FIGS. 5 and 6 shows the state of the airflow when the speed of the airflow is higher on the camera non-installation side than on the camera installation side, and the right side of FIGS. The state of the airflow when the airflow speed is faster than the non-installation side is shown. It is assumed that the height of the skirt 4 and the pressure in the furnace are the same on the left side and the right side of FIGS. Moreover, the arrow line shown in FIG. 5, FIG. 6 is a figure which shows notionally the three-dimensional velocity vector of the airflow in each position of a boundary area | region. Here, the direction of the arrow line shown in FIGS. 5 and 6 indicates the direction of the airflow, and the length of the arrow line shown in FIGS. 5 and 6 indicates the magnitude of the speed of the airflow.

  As shown on the left side of FIGS. 5 and 6, if a large amount of deposits adhere to the area on the camera installation side at the edge of the furnace port 1 a of the converter 1, the progress of the airflow is inhibited on the camera installation side. The speed of the airflow is higher on the non-camera installation side than on the camera installation side. Therefore, the magnitude of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region imaged by the imaging devices 200a and 200b is such that deposits adhere to the region on the edge of the furnace port 1a of the converter 1 where the camera is not installed. It becomes smaller than the case where it is not. Therefore, in the example shown on the left side of FIG. 5, the furnace port pressure corresponding to the magnitude of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region imaged by the imaging devices 200a and 200b is higher than the actual furnace port pressure. (If the arrow line (three-dimensional velocity vector) goes outside the converter 1 from the boundary region, the shorter the length of the arrow line (the smaller the absolute value of the three-dimensional velocity vector) ), Indicating that the furnace port pressure is low). In the example shown on the left side of FIG. 6, the furnace port pressure corresponding to the magnitude of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region imaged by the imaging devices 200 a and 200 b is higher than the actual furnace port pressure. (When the arrow line (three-dimensional velocity vector) goes from the outside of the converter 1 to the boundary region, the shorter the length of the arrow line (the smaller the absolute value of the three-dimensional velocity vector), Represents high furnace port pressure).

  On the other hand, if a large amount of deposits adheres to the area on the camera non-installation side of the edge of the furnace port 1a of the converter 1, the progress of the airflow is hindered on the camera non-installation side. As shown in FIG. 4, the airflow speed is higher on the camera installation side than on the camera installation side. In the example shown on the right side of FIG. 5, the furnace port pressure corresponding to the magnitude of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region imaged by the imaging devices 200a and 200b is higher than the actual furnace port pressure. (When the arrow line (three-dimensional velocity vector) goes from the boundary region to the outside of the converter 1, the longer the length of the arrow line (the smaller the absolute value of the three-dimensional velocity vector), Represents high furnace port pressure). In the example shown on the right side of FIG. 6, the furnace port pressure corresponding to the magnitude of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region imaged by the imaging devices 200a and 200b is lower than the actual furnace port pressure. (When the arrow line (three-dimensional velocity vector) goes from the outside of the converter 1 to the boundary region, the longer the length of the arrow line (the larger the absolute value of the three-dimensional velocity vector), Represents low furnace port pressure).

  If the three-dimensional velocity vector of the airflow in the boundary region can be derived on both the camera installation side and the camera non-installation side, the furnace port pressure can be estimated based on the three-dimensional velocity vector of the airflow in the boundary region. it can. However, in the present embodiment, as described above, the position where the imaging devices 200a and 200b are installed is the position on the side of the tilting direction during the discharge from the converter 1, and the position in the tilting direction side during the steel output from the converter 1 is. Do not place an imaging device.

  In addition, although the three-dimensional velocity vector of the airflow in the boundary region corresponds to the furnace port pressure, in order to construct a model (calculation formula) that converts the three-dimensional velocity vector of the airflow in the boundary region into the furnace port pressure, It is necessary to make various assumptions and determine coefficients. For this reason, it is not easy to construct a model (calculation formula) for calculating the furnace port pressure with high accuracy.

  From the above, in this embodiment, a simulated operation simulating a normal operation is performed using a plurality of converters 1 having different states of the edge of the furnace port 1a, and in each operation, the same as the speed vector deriving unit 402 By performing the processing, a three-dimensional velocity vector of the air flow in the boundary region is derived, and the furnace port pressure is measured by the furnace port pressure gauge 10. The derivation of the three-dimensional velocity vector of the air flow in the boundary region as described above and the measurement of the furnace port pressure are performed at each of the heights of the plurality of skirts 4.

By deriving the three-dimensional velocity vector of the airflow in the boundary region, the direction of the airflow and the state of the airflow bias are specified.
In the present embodiment, the direction of the airflow is assumed to be either a direction from the boundary region toward the outside of the converter 1 or a direction from the outside of the converter 1 toward the boundary region.
In the present embodiment, the state of the airflow bias is any one of the first state, the second state, and the third state.

  The first state is a state in which the speed of the airflow is higher on the tilting direction side (camera non-installation side) at the time of steel output than on the tilting direction side (camera installation side) at the time of removal, This is a state where the absolute value of the size of the three-dimensional velocity vector is below the lower limit threshold. The second state is a state in which the speed of the airflow is faster on the tilting direction side (camera installation side) than the tilting direction side (camera non-installation side) on the steel exit, This is a state in which the absolute value of the size of the three-dimensional velocity vector exceeds the upper threshold. The third state is a state in which the velocity of the airflow can be considered to be the same between the tilting direction side during removal (camera installation side) and the tilting direction side during steel output (camera non-installation side). The absolute value of the magnitude of the three-dimensional velocity vector of the airflow at is in a state of not less than the lower threshold and not more than the upper threshold.

  As described above, there is a time delay in the furnace port pressure measured by the furnace port pressure gauge 10. Therefore, in the present embodiment, among the three consecutive times t1, t2, and t3 when the imaging devices 200a and 200b perform imaging, the first time t1 is the time when the three-dimensional velocity vector of the airflow in the boundary region is obtained. To do. The three-dimensional velocity vector of the airflow in the boundary region obtained in this way is expressed as F0 → (t1). Then, the furnace port pressure is measured by the furnace port pressure gauge 10 at the time t1 + Δt when the measurement delay time Δt by the furnace port pressure gauge 10 has elapsed from the time t1. Here, the delay time Δt of the measurement by the furnace port pressure gauge 10 is a time that is assumed as the time until the furnace port pressure is reflected in the measurement value by the furnace port pressure gauge 10, for example, It can be determined based on the distance to the measurement area of the furnace port pressure gauge 10 and the typical flow rate of the exhaust gas. The furnace port pressure thus measured is expressed as P0 (t1 + Δt).

  As described above, the three-dimensional velocity vector F0 → (t1) of the airflow in the boundary region and the furnace port pressure for each direction of the airflow in the boundary region, the state of the airflow bias in the boundary region, and the height of the skirt 4 P0 (t1 + Δt) and camera images (t1, t2, t3) captured at times t1, t2, and t3 are obtained. In the present embodiment, the three-dimensional velocity vector F0 → (t1) of the air flow in the boundary region, the furnace port pressure P0 (t1 + Δt), and the camera image (t1, t2, t3) obtained by the same simulated operation. The included information is stored in advance in the data storage unit 405 as one feature amount. In the following description, this feature amount is referred to as a boundary region feature amount as necessary.

FIG. 7 is a diagram for explaining an example of the boundary region feature amount stored in the data storage unit 405. In FIG. 7, the three-dimensional velocity vector F0 → (t1) of the airflow in the boundary region corresponds to the one marked with → on F0 of F0 (t1).
In FIG. 7, the standard ejection feature quantity 710 is that the direction of the three-dimensional velocity vector of the airflow in the boundary region is a positive direction (F0> 0), and the magnitude | F0 | of the absolute value is the first threshold value α1. As described above, the boundary region feature amount in the case of being within the range equal to or smaller than the second threshold value α2 (α1 ≦ | F0 | ≦ α2) is shown. As described above, the direction of the three-dimensional velocity vector of the airflow in the boundary region being a positive direction corresponds to the direction of the airflow being from the boundary region toward the outside of the converter 1. Here, the first threshold value α1 corresponds to the aforementioned lower limit threshold value, and the second threshold value α2 corresponds to the aforementioned upper limit threshold value. The standard ejection feature quantity 710 is the boundary area feature quantity in the third state described above.

  Here, an example of a method for setting the first threshold value α1 and the second threshold value α2 will be described. First, the above-described simulated operation is performed in a plurality of states in which deposits are attached to the same extent in the area on the camera non-installation side and the area on the camera installation side of the edge of the furnace port 1a of the converter 1. In each state, a three-dimensional velocity vector of the air current in the boundary region is derived, and the magnitude | F0 | of the absolute value of the three-dimensional velocity vector indicating the positive direction is obtained. The minimum value of the absolute value | F0 | of the obtained three-dimensional velocity vector is set as the first threshold value α1, and the maximum value is set as the second threshold value α2. Since there are various states in which deposits are attached to the same extent in the area on the camera non-installation side and the area on the camera installation side at the edge of the furnace port 1a of the converter 1, there is a standard for each state. The ejection feature amounts 710a to 710n are stored.

  The camera installation side / spout feature quantity 720 is such that the direction of the three-dimensional velocity vector of the airflow in the boundary region is a positive direction (F0> 0), and the magnitude | F0 | of the absolute value is equal to the second threshold value α2. The boundary region feature amount when exceeding (| F0 |> α2) is shown. As described above, the second threshold value α2 is in the boundary region in the state where the adhering matter adheres to the same extent in the region on the camera non-installation side and the region on the camera installation side of the edge of the furnace port 1a of the converter 1. This is the maximum value of the magnitude | F0 | of the absolute value of the three-dimensional velocity vector indicating the positive direction among the three-dimensional velocity vectors of the airflow. Accordingly, the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region exceeds the second threshold value α2, which means that the region on the camera non-installation side is attached more than the region on the camera installation side. A lot of kimono is attached, which corresponds to the fact that the speed of the airflow in the boundary region is faster on the camera installation side than on the camera non-installation side. There are various states in which the amount of adhering material adheres more in the camera non-installation area than in the camera installation area. Therefore, for each state, the camera installation / ejection feature amount 720a to 720n. Is memorized. The camera installation side / spout feature quantity 720 is the boundary area feature quantity in the second state described above.

  On the camera non-installation side / ejection feature amount 730, the direction of the three-dimensional velocity vector of the airflow in the boundary region is a positive direction (F0> 0), and the magnitude | F0 | of the absolute value is the first threshold value α1. The boundary region feature amount when the value is below (| F0 | <α1). As described above, the first threshold value α1 is the boundary region in the state where the adhering matter is attached to the same extent in the region on the camera non-installation side and the region on the camera installation side of the edge of the furnace port 1a of the converter 1. Is the minimum value of the magnitude | F0 | of the absolute value of the three-dimensional velocity vector indicating the positive direction among the three-dimensional velocity vectors of the airflow. Therefore, the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region is lower than the first threshold value α1, so that the region on the camera installation side is attached more than the region on the camera non-installation side. A lot of kimono is attached, and this corresponds to the fact that the air velocity in the boundary region is slower on the camera installation side than on the camera non-installation side. Since there are various states in which the amount of deposits on the camera installation side region is larger than that on the camera non-installation region, the camera non-installation side and ejection feature amount 730a˜ 730n is stored. The camera non-installation side / ejection feature amount 730 is the boundary region feature amount in the first state described above.

  The reference feature amount 740 is a boundary region feature amount when the three-dimensional velocity vector of the airflow in the boundary region is 0 (zero), and corresponds to the boundary region feature amount in a state where there is no airflow in and out of the boundary region.

  In the standard suction feature quantity 750, the direction of the three-dimensional velocity vector of the airflow in the boundary region is a negative direction (F0 <0), and the magnitude | F0 | of the absolute value is equal to or greater than the third threshold value α3. The boundary region feature amount in the case where the value is within the range of α4 or less (α3 ≦ | F0 | ≦ α4). As described above, the negative direction of the three-dimensional velocity vector of the airflow in the boundary region corresponds to the direction of the airflow from the outside of the converter 1 toward the boundary region. The third threshold value α3 corresponds to the above-described lower limit threshold value, and the fourth threshold value α4 corresponds to the above-described upper limit threshold value. The standard suction feature value 750 is the boundary region feature value in the third state described above.

  Here, an example of a method for setting the third threshold value α3 and the fourth threshold value α4 will be described. First, the above-described simulated operation is performed in a plurality of states in which deposits are attached to the same extent in the area on the camera non-installation side and the area on the camera installation side of the edge of the furnace port 1a of the converter 1. Then, in each state, a three-dimensional velocity vector of the air current in the boundary region is derived, and the magnitude | F0 | of the absolute value of the three-dimensional velocity vector indicating the negative direction is obtained. Then, the minimum value of the absolute value magnitude | F0 | of the obtained three-dimensional velocity vector is set as a third threshold value α3, and the maximum value is set as a fourth threshold value α4. Since there is a state in which deposits are attached to the same extent in the region on the camera non-installation side and the region on the camera installation side at the edge of the furnace port 1a of the converter 1, the standard suction feature amount 750a to 750a ~ 750n is stored.

  The camera installation side / suction feature quantity 760 is such that the direction of the three-dimensional velocity vector of the airflow in the boundary region is a negative direction (F0 <0), and the magnitude | F0 | of the absolute value sets the fourth threshold value α4. When it exceeds (| F0 |> α4), the boundary region feature amount is shown. As described above, the fourth threshold value α4 is a boundary region in a state where deposits are attached to the same extent in the region on the camera non-installation side and the region on the camera installation side of the edge of the furnace port 1a of the converter 1. Is the maximum value of the magnitude | F0 | of the absolute value of the three-dimensional velocity vector indicating the negative direction among the three-dimensional velocity vectors of the airflow at. Therefore, the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region exceeds the fourth threshold value α4. The region on the camera non-installation side is attached more than the region on the camera installation side. A lot of kimono is attached, which corresponds to the fact that the speed of the airflow in the boundary region is faster on the camera installation side than on the camera non-installation side. Since there are various states in which the amount of adhering material adheres more in the camera non-installation side region than in the camera installation side region, the camera installation side / suction feature amount 760a to 760n for each state. Is memorized. The camera installation side / suction feature amount 760 is the boundary region feature amount in the second state described above.

  On the camera non-installation side / suction feature quantity 770, the direction of the three-dimensional velocity vector of the airflow in the boundary region is negative (F0 <0), and the magnitude | F0 | of the absolute value is the third threshold value α3. The boundary region feature amount when the value is below (| F0 | <α3) is shown. As described above, the third threshold value α3 is the boundary region in the state where the adhering matter adheres to the same extent in the region on the camera non-installation side and the region on the camera installation side of the edge of the furnace port 1a of the converter 1. Is the minimum value of the magnitude | F0 | of the absolute value of the three-dimensional velocity vector indicating the negative direction among the three-dimensional velocity vectors of the airflow. Therefore, the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow in the boundary region is lower than the third threshold value α3, so that the region on the camera installation side is attached more than the region on the camera non-installation side. A lot of kimono is attached, and this corresponds to the fact that the air velocity in the boundary region is slower on the camera installation side than on the camera non-installation side. Since there are various states in which the amount of deposits on the camera installation side region is larger than that on the camera non-installation region, the camera non-installation side / suction feature amount 770a˜ 770n is stored. The camera non-installation side / suction feature amount 770 is the boundary region feature amount in the first state described above.

  Standard ejection feature quantity 710 as described above, camera installation side / ejection feature quantity 720, camera non-installation side / ejection feature quantity 730, reference feature quantity 740, standard suction feature quantity 750, camera installation side / suction feature quantity 760, and The camera non-installation side / suction feature quantity 770 is stored in advance in the data storage unit 405 for each height of the skirt 4. In the following description, the standard ejection feature quantity 710, the camera installation side / ejection feature quantity 720, the camera non-installation side / ejection feature quantity 730, the reference feature quantity 740, the standard suction feature quantity 750, the camera installation side / suction feature quantity 760, The camera non-installation side / suction feature quantity 770 is collectively referred to as a boundary area feature quantity group as necessary.

  The data extraction unit 404 extracts from the data storage unit 405 a boundary region feature quantity group corresponding to the current value of the height of the skirt 4 acquired by the skirt height acquisition unit 403. At this time, if there is no boundary region feature quantity group having the same height as the height of the skirt 4 acquired by the skirt height acquisition unit 403, the data extraction unit 404, for example, has a height closest to the height of the skirt 4 The boundary region feature quantity group is extracted.

<Airflow direction determination unit 406>
The airflow direction determination unit 406 determines the direction of the airflow in the boundary region based on the direction of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402. Specifically, the airflow direction determination unit 406 determines whether or not the airflow in the boundary region is 0 (zero). Further, the airflow direction determination unit 406 determines that the direction of the airflow in the boundary region is from the boundary region toward the outside of the converter 1 and the boundary region from the outside of the converter 1 when the airflow in the boundary region is not 0 (zero). It is determined whether the direction is toward the.

  As described above, in the present embodiment, when the direction of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is a positive direction, the direction of the airflow in the boundary region is from the boundary region to the outside of the converter 1. It is the direction toward. On the other hand, when the direction of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is a negative direction, the direction of the airflow in the boundary region is the direction from the outside of the converter 1 toward the boundary region. In the following description, a direction from the boundary region toward the outside of the converter 1 is referred to as an ejection direction as necessary, and a direction from the outside of the converter 1 toward the boundary region is referred to as a suction direction.

When the airflow in the boundary region is not 0 (zero), the airflow direction determination unit 406 determines the absolute value of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 | F0 | Determine the bias of the airflow.
In the present embodiment, the airflow direction determining unit 406 determines the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 when the direction of the airflow in the boundary region is the ejection direction. The first threshold value α1 and the second threshold value α2 are compared.

  Specifically, the airflow direction determination unit 406 determines that the magnitude | F0 | of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is greater than or equal to the first threshold value α1 and less than or equal to the second threshold value α2. In some cases, it is determined that there is no airflow bias in the boundary region. Further, when the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 exceeds the second threshold value α2, the airflow direction determination unit 406 determines that the airflow in the boundary region is It is determined that it is biased toward the camera installation side. Further, when the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is less than the first threshold value α1, the airflow direction determining unit 406 It is determined that it is biased toward the camera non-installation side.

  In the present embodiment, the airflow direction determination unit 406 determines the magnitude of the absolute value of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 when the airflow direction in the boundary region is the suction direction | F0. | Is compared with the third threshold value α3 and the fourth threshold value α4.

  Specifically, the airflow direction determination unit 406 determines that the magnitude | F0 | of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is not less than the third threshold value α3 and not more than the fourth threshold value α4. In some cases, it is determined that there is no airflow bias in the boundary region. Further, when the magnitude | F0 | of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 exceeds the fourth threshold value α4, the airflow direction determining unit 406 determines that the airflow in the boundary region is It is determined that it is biased toward the camera installation side. Further, when the magnitude | F0 | of the absolute value of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is smaller than the third threshold value α3, the airflow direction determining unit 406 It is determined that it is biased toward the camera non-installation side.

<Reactor port pressure deriving unit 407>
The furnace port pressure deriving unit 407 uses the data extraction unit 404 to extract boundary region feature amounts corresponding to the determination result of the airflow direction determining unit 406 and the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402. The current value of the furnace port pressure is derived based on the furnace port pressure P0 (t1 + Δt) included in the selected boundary region feature value.

In the present embodiment, when the airflow direction determination unit 406 determines that the airflow in the boundary region is 0 (zero), the furnace port pressure deriving unit 407 determines the furnace port pressure P0 (t1 + Δt) included in the reference feature quantity 740. ) As the current value of the furnace port pressure.
When the airflow direction determining unit 406 determines that the airflow direction in the boundary region is the ejection direction and the airflow in the boundary region is not biased, the furnace port pressure deriving unit 407 has the standard ejection feature quantity 710a. The air flow three-dimensional velocity vector F 0 → (t 1) is selected from among ˜710 n closest to the air flow three-dimensional velocity vector derived by the velocity vector deriving unit 402. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected standard ejection feature value as the current value of the furnace port pressure.

  When the airflow direction determination unit 406 determines that the airflow direction in the boundary region is the ejection direction and the airflow in the boundary region is biased toward the camera installation side, the furnace port pressure deriving unit 407 From the installation side / ejection feature amounts 720a to 720n, the one in which the three-dimensional velocity vector F0 → (t1) of the airflow is closest to the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is selected. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera installation side / ejection feature amount as the current value of the furnace port pressure.

  Further, when the airflow direction determining unit 406 determines that the airflow direction in the boundary region is the ejection direction and the airflow in the boundary region is biased toward the camera non-installation side, From the camera non-installation side / ejection feature amounts 730a to 730n, the one in which the three-dimensional velocity vector F0 → (t1) of the airflow is closest to the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is selected. . Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera non-installation side / ejection feature value as the current value of the furnace port pressure.

  When the airflow direction determining unit 406 determines that the airflow direction in the boundary region is the suction direction and the airflow in the boundary region is not biased, the furnace port pressure deriving unit 407 has a standard suction feature quantity 750a. The airflow three-dimensional velocity vector F0 → (t1) that is closest to the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is selected from ˜750n. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected standard suction feature quantity as the current value of the furnace port pressure.

  When the airflow direction determination unit 406 determines that the airflow direction in the boundary region is the suction direction and the airflow in the boundary region is biased toward the camera installation side, the furnace port pressure deriving unit 407 From the installation side / suction feature quantities 760a to 760n, the airflow three-dimensional velocity vector F0 → (t1) is selected that is closest to the airflow three-dimensional velocity vector derived by the velocity vector deriving unit 402. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera installation side / suction feature amount as the current value of the furnace port pressure.

  Further, when the airflow direction determining unit 406 determines that the airflow direction in the boundary region is the suction direction and the airflow in the boundary region is biased toward the camera non-installation side, From the camera non-installation side / suction feature quantities 770a to 770n, the one in which the three-dimensional velocity vector F0 → (t1) of the airflow is closest to the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is selected. . Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera non-installation side / suction feature amount as the current value of the furnace port pressure.

<Reactor port pressure output unit 408>
The furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived by the furnace port pressure deriving unit 407 to the control device 400.

(Operation flowchart)
Next, an example of the furnace port pressure setting method using the furnace port pressure setting device 100 will be described with reference to the flowchart of FIG. Note that it is assumed that the boundary region feature quantity group is stored in the data storage unit 405 before the flowchart of FIG. 8 is executed.
First, in step S801, the image acquisition unit 401 acquires images (camera images) at times t1, t2, and t3 captured by the imaging devices 200a and 200b.
Next, in step S <b> 802, the velocity vector deriving unit 402 performs image processing on the camera image acquired by the image acquiring unit 401 to derive a three-dimensional velocity vector of the air current in the boundary region.

Next, in step S803, the skirt height acquisition unit 403 acquires the current value of the height of the skirt 4 based on the measurement result of the skirt height meter 5.
Next, in step S804, the data extraction unit 404 extracts from the data storage unit 405 a boundary region feature quantity group corresponding to the current value of the height of the skirt 4 acquired in step S803.

Next, in step S805, the airflow direction determination unit 406 determines the direction of airflow in the boundary region based on the three-dimensional velocity vector of the airflow derived in step S802.
As a result of this determination, if the airflow in the boundary region is 0 (zero), the process proceeds to step S806. In step S806, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the reference feature value 740 from the boundary region feature value group extracted in step S804 as the current value of the furnace port pressure. To do. And the process by the flowchart of FIG. 8 is complete | finished.

In step S807, the furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived in step S806 to the control device 400.
If it is determined in step S805 that the airflow direction in the boundary region is the ejection direction, the process proceeds to step S808. In step S808, the airflow direction determination unit 406 determines the bias of the airflow in the boundary region. As a result of this determination, if there is no bias in the airflow in the boundary region, the process proceeds to step S809.

  In step S809, the furnace port pressure deriving unit 407 generates a three-dimensional velocity vector F0 → (t1) of the air flow from the standard ejection feature amounts 710a to 710n out of the boundary region feature amount group extracted in step S804. The one closest to the three-dimensional velocity vector of the airflow derived in step S802 is selected. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected standard ejection feature value as the current value of the furnace port pressure. In step S807, the furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived in step S809 to the control device 400. And the process by the flowchart of FIG. 8 is complete | finished.

  If it is determined in step S808 that the airflow in the boundary region is biased toward the camera installation side, the process proceeds to step S810. In step S810, the furnace port pressure deriving unit 407 determines the three-dimensional velocity vector F0 → (t1) of the air current from the camera installation side / ejection feature amounts 720a to 720n out of the boundary region feature amount group extracted in step S804. ) Selects the one closest to the three-dimensional velocity vector of the airflow derived in step S802. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera installation side / ejection feature amount as the current value of the furnace port pressure. In step S807, the furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived in step S810 to the control device 400. And the process by the flowchart of FIG. 8 is complete | finished.

  If it is determined in step S808 that the airflow in the boundary region is biased toward the camera non-installation side, the process proceeds to step S811. In step S811, the furnace port pressure deriving unit 407 determines the three-dimensional velocity vector F0 of the air flow from the camera non-installation side / ejection feature amounts 730a to 730n out of the boundary region feature amount group extracted in step S804. t1) selects the one closest to the three-dimensional velocity vector of the airflow derived in step S802. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera non-installation side / ejection feature value as the current value of the furnace port pressure. In step S807, the furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived in step S811 to the control device 400. And the process by the flowchart of FIG. 8 is complete | finished.

If it is determined in step S805 that the direction of the airflow in the boundary region is the suction direction, the process proceeds to step S812. In step S812, the airflow direction determination unit 406 determines airflow bias in the boundary region. As a result of this determination, if there is no bias in the airflow in the boundary region, the process proceeds to step S813.
In step S813, the furnace port pressure deriving unit 407 generates a three-dimensional velocity vector F0 → (t1) of the air flow from the standard suction feature values 750a to 750n out of the boundary region feature value group extracted in step S804. The one closest to the three-dimensional velocity vector of the airflow derived in step S802 is selected. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected standard suction feature quantity as the current value of the furnace port pressure. In step S807, the furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived in step S813 to the control device 400. And the process by the flowchart of FIG. 8 is complete | finished.

  If it is determined in step S812 that the airflow in the boundary region is biased toward the camera installation side, the process proceeds to step S814. In step S814, the furnace port pressure deriving unit 407 determines the three-dimensional velocity vector F0 → (t1) from the camera installation side / suction feature amounts 760a to 760n out of the boundary region feature amount group extracted in step S804. ) Selects the one closest to the three-dimensional velocity vector of the airflow derived in step S802. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera installation side / suction feature amount as the current value of the furnace port pressure. In step S807, the furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived in step S814 to the control device 400. And the process by the flowchart of FIG. 8 is complete | finished.

  If it is determined in step S812 that the airflow in the boundary region is biased toward the camera non-installation side, the process proceeds to step S815. In step S815, the furnace port pressure deriving unit 407, among the boundary region feature quantity group extracted in step S804, from the camera non-installation side / suction feature quantities 770a to 770n, the three-dimensional velocity vector F0 → ( t1) selects the one closest to the three-dimensional velocity vector of the airflow derived in step S802. Then, the furnace port pressure deriving unit 407 derives the furnace port pressure P0 (t1 + Δt) included in the selected camera non-installation side / suction feature amount as the current value of the furnace port pressure. In step S807, the furnace port pressure output unit 408 outputs the current value of the furnace port pressure derived in step S815 to the control device 400. And the process by the flowchart of FIG. 8 is complete | finished.

(Summary)
As described above, in the present embodiment, the three-dimensional velocity vector F0 (t1) of the air flow at the time t1 in the boundary region and the furnace port pressure gauge from the time t1 are made different in the direction and bias conditions of the air flow in the boundary region. The furnace port pressure P0 (t1 + Δt) measured by the furnace port pressure gauge 10 is acquired at time t1 + Δt when the measurement delay time Δt by 10 has elapsed, and these are used as boundary region feature values. In accordance with the conditions of the direction and bias of the airflow in the boundary region, the boundary region feature amount includes a standard ejection feature amount 710, a camera installation side / ejection feature amount 720, a camera non-installation side / ejection feature amount 730, a reference feature amount 740 The data is classified into one of the standard suction feature quantity 750, the camera installation side / suction feature quantity 760, and the camera non-installation side / suction feature quantity 770, and stored in the data storage unit 405 in advance.

  Thereafter, the furnace port pressure setting device 100 derives a three-dimensional velocity vector of the airflow in the boundary region based on the result of image processing of the camera images picked up by the image pickup devices 200a and 200b. A corresponding boundary region feature amount is extracted from the data storage unit 405, and a furnace port pressure P0 (t1 + Δt) included in the extracted feature amount is derived as a current value of the furnace port pressure.

  Therefore, imaging is not hindered by smoke containing dust generated in the converter. Therefore, it is possible to reliably estimate the current value of the furnace port pressure corresponding to the air flow direction and bias in the boundary region. Further, when the measured value of the furnace port pressure is acquired at the timing of controlling the furnace port pressure, since there is a delay time Δt of the measurement by the furnace port pressure gauge 10, the measured value is obtained at the timing of controlling the furnace port pressure. It does not accurately reflect the furnace port pressure. On the other hand, in the present embodiment, the furnace port pressure P0 (t1 + Δt) included in the boundary region feature value is measured at a timing that takes into account the delay time Δt of measurement by the furnace port pressure gauge 10. Therefore, it is possible to accurately estimate the current value of the furnace port pressure corresponding to the direction and bias of the airflow in the boundary region. Therefore, the control of the furnace port pressure by the control device 400 can be performed with high accuracy. Furthermore, it is not necessary to construct a model (calculation formula) for converting the three-dimensional velocity vector of the airflow in the boundary region into the furnace port pressure. Therefore, it is possible to easily estimate the current value of the furnace port pressure corresponding to the air flow direction and bias in the boundary region.

  Further, by including the camera image in the boundary region feature quantity, for example, the classification destination of the feature quantity (standard ejection feature quantity 710, camera installation side / ejection feature quantity 720, camera non-installation side / ejection feature quantity 730, reference feature, etc. The operator or administrator determines whether the amount 740, the standard suction feature amount 750, the camera installation side / suction feature amount 760, or the camera non-installation side / suction feature amount 770) are appropriate. This can be verified afterwards by comparing it with the three-dimensional velocity vector of the airflow.

(Modification)
<Modification 1>
In the present embodiment, the case where the boundary region feature amount group stored in the data storage unit 405 is not fixed (changed) has been described as an example. However, the boundary region feature quantity group stored in the data storage unit 405 may be updated. For example, the furnace port pressure setting device 100 obtains the measured value of the furnace port pressure at the furnace port pressure gauge 10 when the delay time Δt has elapsed from the first time among the imaging times of the three camera images acquired in step S801. Acquired and stores the camera image, the measured value of the furnace port pressure, and the three-dimensional velocity vector of the air current in the boundary region derived in step S802 based on the camera image as a new boundary region feature amount You may memorize | store in the part 405. At this time, the furnace port pressure setting device 100 converts the new boundary region feature amount into the standard ejection feature amount 710, the camera, based on the direction and magnitude absolute value of the three-dimensional velocity vector of the airflow in the boundary region. Installation side / spout feature quantity 720, camera non-installation side / spout feature quantity 730, reference feature quantity 740, standard suction feature quantity 750, camera installation side / suction feature quantity 760, and camera non-installation side / suction feature quantity 770 Classify into one.

<Modification 2>
In this embodiment, the boundary region feature amount is determined depending on whether the direction of the airflow in the boundary region is the ejection direction or the suction direction, and whether the airflow bias in the boundary region is on the camera installation side or the camera non-installation side. Although the case where the data is classified and stored in the data storage unit 405 has been described as an example, the boundary region feature amount may be further subdivided and classified. For example, a plurality of ranges are defined as the range of angles between the direction of the airflow in the boundary region and a predetermined direction (for example, the vertical direction with respect to the ground), and the direction of the airflow in the boundary region is any of the plurality of ranges Depending on how the boundary region feature quantity is classified, the classification destination may be different. In this case, the airflow direction determination unit 406 determines in which of the plurality of ranges the direction of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 is included, and the furnace port pressure The deriving unit 407 derives the current value of the furnace port pressure based on the furnace port pressure P0 (t1 + Δt) included in the boundary region feature quantity classified in the determined range.

<Modification 3>
In the present embodiment, the data extraction unit 404 determines that the skirt acquired by the skirt height acquisition unit 403 when there is no boundary area feature quantity group having the same height as the height of the skirt 4 acquired by the skirt height acquisition unit 403. The case where the boundary region feature quantity group having the height closest to the height of 4 is extracted has been described as an example. However, this is not always necessary. For example, first, the data extraction unit 404 is closest to the height of the skirt 4 acquired by the skirt height acquisition unit 403 among the heights higher than the height of the skirt 4 acquired by the skirt height acquisition unit 403. Of the height boundary area feature amount group and the height lower than the height of the skirt 4 acquired by the skirt height acquisition unit 403, the closest to the height of the skirt 4 acquired by the skirt height acquisition unit 403 Two or more (preferably three or more) boundary region feature amount groups including the height boundary region feature amount group are extracted. Then, the data extraction unit 404 interpolates the values of the extracted boundary region feature quantity group (for example, performs linear interpolation or spline interpolation), thereby obtaining the height of the skirt 4 acquired by the skirt height acquisition unit 403. A boundary region feature group is derived. As described above, a more accurate boundary region feature amount group is obtained as the boundary region feature amount group of the height of the skirt 4 acquired by the skirt height acquisition unit 403.

<Modification 4>
In the present embodiment, the furnace port pressure deriving unit 407 has the same boundary region feature amount corresponding to the determination result of the airflow direction determining unit 406 as the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402. If not included, the velocity vector deriving unit 402 derives the three-dimensional velocity vector F0 → (t1) of the airflow in the boundary region out of the boundary region feature amounts corresponding to the determination result of the airflow direction determining unit 406. As an example, the boundary region feature value closest to the three-dimensional velocity vector of the air flow is selected, and the furnace port pressure P0 (t1 + Δt) included in the selected boundary region feature value is derived as the current value of the furnace port pressure. explained. However, this is not always necessary.

  For example, the furnace port pressure deriving unit 407 determines the absolute magnitude of the three-dimensional velocity vector of the air flow derived by the velocity vector deriving unit 402 from the boundary region feature amount corresponding to the determination result of the air flow direction determining unit 406. Among the velocity vectors F0 → (t1) exceeding the value, the boundary region feature quantity including the velocity vector F0 → (t1) closest to the absolute value of the magnitude of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 Among the velocity vectors F0 → (t1) that are less than the absolute value of the magnitude of the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402, the three-dimensional velocity vector of the airflow derived by the velocity vector deriving unit 402 2 or more (preferably 3 or more) boundary areas including the boundary region feature quantity including the velocity vector F0 → (t1) closest to the absolute value of Extracting a feature quantity. Then, the furnace port pressure deriving unit 407 interpolates the furnace port pressure P0 (t1 + Δt) included in the extracted boundary region feature amount (for example, linear interpolation or spline interpolation) to derive by the velocity vector deriving unit 402. A furnace port pressure corresponding to the three-dimensional velocity vector of the generated airflow is derived. As described above, a more accurate furnace port pressure can be obtained as the furnace port pressure corresponding to the three-dimensional velocity vector of the air flow derived by the velocity vector deriving unit 402.

<Modification 5>
In the present embodiment, the three-dimensional velocity vector F0 → (t1) of the air current in the boundary region derived by the same algorithm as the velocity vector deriving unit 402 based on the camera image, and the furnace port pressure P0 measured by the furnace port pressure gauge 10. The case where (t1 + Δt) is included in the boundary region feature amount stored in the data storage unit 405 has been described as an example. As described above, this is preferable because the current value of the furnace port pressure can be easily obtained. However, this is not always necessary. For example, the boundary region feature value may be derived from the result of numerical analysis of the flow of exhaust gas generated from the converter 1.

<Modification 6>
Even if the furnace port pressure setting system is realized by one device (furnace port pressure setting device 100) as described in the present embodiment, the function of the furnace port pressure setting device 100 is realized by a plurality of devices. Also good. For example, the image acquisition unit 401 and the velocity vector deriving unit 402 are realized by the device described in Non-Patent Document 1, and the other parts (skirt height acquisition unit 403 to furnace port pressure output unit 408) are realized by one device. May be. Further, the data storage unit 405 may be realized by a device different from other parts.

<Other variations>
The embodiment of the present invention described above can be realized by a computer executing a program. Further, a computer-readable recording medium in which the program is recorded and a computer program product such as the program can also be applied as an embodiment of the present invention. As the recording medium, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.
In addition, the embodiments of the present invention described above are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. Is. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

  1: converter, 4: skirt, 10: furnace port pressure gauge, 100: furnace port pressure setting device, 200a to 200b: imaging device, 300: laser device, 400: control device, 401: image acquisition unit, 402: speed Vector derivation unit, 403: Skirt height acquisition unit, 404: Data extraction unit, 405: Data storage unit, 406: Airflow direction determination unit, 407: Furnace port pressure deriving unit, 408: Furnace port pressure output unit, 710: Standard 720: Camera installation side / ejection feature quantity, 730: Camera non-installation side / ejection feature quantity, 740: Reference feature quantity, 750: Standard suction feature quantity, 760: Camera installation side / suction feature quantity, 770: Camera non-installation side, suction feature

Claims (13)

Based on a captured image of a boundary area that is a boundary that is visible when the converter is viewed from the outside and includes a boundary between the converter and a skirt disposed above the converter. Velocity vector deriving means for deriving the velocity vector of the airflow in the region;
Furnace port pressure deriving means for deriving a furnace port pressure, which is a pressure at the furnace port of the converter, based on the speed vector derived by the speed vector deriving unit;
Storage means for preliminarily storing a boundary region feature amount including a velocity vector of the airflow in the boundary region and the furnace port pressure corresponding to the velocity vector;
The furnace port pressure deriving unit reads out the furnace port pressure corresponding to the speed vector derived by the speed vector deriving unit from the furnace port pressure stored in the storage unit, and reads the read out furnace port A furnace port pressure setting system, wherein a current value of the furnace port pressure is derived based on pressure.   The direction of the airflow in the boundary region is a direction from the gap between the converter and the skirt toward the outside of the converter, and a direction from the outside of the converter to the gap between the converter and the skirt. The furnace port pressure setting system according to claim 1, comprising:   The image pickup means for picking up the picked-up image is disposed on the side of the tilting direction at the time of discharge, which is the side of the direction of tilting the converter at the time of discharge, than the axis of the converter, 3. The furnace port pressure setting system according to claim 1, wherein the furnace port pressure setting system is not disposed on a tilting direction side during steel output, which is a direction in which the converter is tilted during steel output. An airflow direction determining means for determining a direction and a biased state of the airflow based on the velocity vector derived by the velocity vector deriving means;
The storage means stores in advance a boundary region feature amount including a velocity vector of the airflow in the boundary region and the furnace port pressure corresponding to the velocity vector for each direction and bias state of the airflow in the boundary region. And
The furnace port pressure deriving unit reads out the furnace port pressure corresponding to the airflow direction and the bias state determined by the airflow direction determining unit from the furnace port pressure stored in the storage unit. The furnace port pressure setting system according to claim 3.   The state of bias of the airflow in the boundary region is a state of bias between the speed of the airflow on the side of the tilting direction at the time of evacuation and the speed of the airflow on the side of the tilting direction at the time of steel exit, and A first state where the absolute value of the velocity is below a lower limit threshold; a second state where the absolute value of the velocity vector is above an upper threshold; and an absolute value of the velocity vector The furnace state pressure setting system according to claim 4, further comprising: a third state that is not less than the lower limit threshold and not more than the upper limit threshold. A skirt height acquisition means for acquiring a current value of the height of the skirt;
The storage means stores the feature quantity in advance for each direction of airflow and the state of bias in the boundary region and for each height of the skirt,
The furnace port pressure deriving unit is configured to determine the furnace port pressure corresponding to the airflow direction and the state of bias determined by the airflow direction determining unit and the height of the skirt acquired by the skirt height acquiring unit. 6. The furnace port pressure setting system according to claim 4, wherein the furnace port pressure is read from the furnace port pressure stored in the storage unit. Measuring means for measuring the pressure in the region above the furnace port of the converter,
The boundary region feature amount is the pressure measured by the measurement unit at a time later than the time when the captured image used for deriving the velocity vector of the airflow in the boundary region is the airflow in the boundary region. The furnace port pressure setting system according to any one of claims 1 to 6, wherein the furnace port pressure setting system is included as a furnace port pressure corresponding to the velocity vector. The boundary region feature amount is measured by the measurement unit at a time when a measurement delay time by the measurement unit has elapsed from the time when the captured image used for deriving the velocity vector of the airflow in the boundary region is captured. Pressure as the furnace port pressure corresponding to the velocity vector of the airflow in the boundary region,
8. The furnace port pressure according to claim 7, wherein the delay time of the measurement by the measuring unit is a time assumed as a time until the furnace port pressure is reflected in a measurement value by the measuring unit. Configuration system.   The boundary region feature amount includes a velocity vector of an air flow in the boundary region, the furnace port pressure corresponding to the velocity vector, and a captured image used to derive the velocity vector. The furnace port pressure setting system according to any one of claims 1 to 8. There are two imaging means for capturing the captured image of the boundary region,
2. The velocity vector deriving unit derives a three-dimensional velocity vector of an airflow in the boundary region based on captured images of the boundary region captured from different directions by the two imaging units. The furnace port pressure setting system of any one of -9.   A current value of the furnace port pressure derived by the furnace port pressure deriving means in a control device that operates a damper disposed in a path of exhaust gas generated from the converter so that the furnace port pressure becomes equal to a target value. The furnace port pressure setting system according to any one of claims 1 to 10, further comprising a furnace port pressure output means for outputting A boundary that is visible when the converter is viewed from the outside, and is based on a captured image of a boundary area that includes a boundary between the converter and a skirt disposed above the converter. A velocity vector deriving step for deriving a velocity vector of the airflow in the region;
A furnace port pressure that is a pressure at the furnace port of the converter, and a furnace port pressure deriving step for deriving a furnace port pressure corresponding to the speed vector derived by the speed vector deriving step;
A storing step of storing in advance a boundary region feature amount including a velocity vector of the airflow in the boundary region and the furnace port pressure corresponding to the velocity vector for each direction and bias state of the airflow in the boundary region; Have
The furnace port pressure deriving step reads out the furnace port pressure corresponding to the speed vector derived by the speed vector deriving step from among the furnace port pressures stored in the storing step, and reads the read furnace port pressure. Based on the above, a current value of the furnace port pressure is derived.   A program that causes a computer to function as each means of the furnace port pressure setting system according to any one of claims 1 to 11.

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