JP2016169436A - Method for charging foaming depressant of slag, and charging device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for charging a foaming depressant of slag capable of inexpensively and easily depressing the foaming of the slag to be exhausted, and a charging device therefor.SOLUTION: When slag is exhausted from the first container such as a converter storing slag S so as to be stored into the second container such as a slag pan 2, the first field 31a passing through an exhaust slag stream from the first container and the second field 31b at the inside of the second container are imaged, respectively, and the exhaust of the slag S is detected on the basis of the brightness information as the imaging results of both the first field 31a and second field 31b, and the foaming depressant of the slag S is charged to the second container based on the detection result of the exhaust of the slab S.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a slag forming sedative charging method and apparatus.

  In the pretreatment for the purpose of desiliconization and dephosphorization of hot metal performed in a refining apparatus such as a converter, slag is generated along with the oxidation refining treatment. The generated slag is collected in a collection container such as a slag pan after completion of the preliminary process. At this time, the generated slag contains carbon monoxide (CO) gas bubbles that are generated as a result of the treatment, and therefore, a phenomenon in which the slag expands (forming) occurs. When the amount of slag contained in the slag pan is large, the slag flows out of the slag pan due to forming.

  As a method of calming slag forming, for example, in Patent Document 1, the slag upper surface height in a refining vessel such as a topipe is measured with a microwave distance meter or the like, and the measurement value is based on information that has reached a management target value. Thus, a method of automatically adding a forming sedative is disclosed. According to Patent Document 1, it is possible to prevent slag from flowing out due to forming from the refining vessel.

In addition, as a method for detecting an abnormality of a molten metal, for example, in Patent Document 3, an operating state of a molten metal handling facility is imaged, and an abnormal situation of the molten metal handling facility is determined from the brightness of the obtained image. A method for automatically detecting the occurrence of an abnormal situation is disclosed.
Moreover, as a method for monitoring the slag discharged from the refining vessel, for example, Patent Document 3 discloses a method for monitoring the waste flow from the converter using an infrared camera.

JP 11-61234 A JP 2001-269770 A JP 2014-55315 A

  However, in the method described in Patent Document 1, it is necessary to install the microwave rangefinder in the vertical direction above the smelting vessel and the slag pan, and the installation may not be possible due to restrictions on the installation location. In particular, in the case of equipment that accommodates slag discharged from a refining vessel such as a converter in a slag pan, installation of a microwave rangefinder may be difficult because equipment such as a converter is provided above the slag pan. . Moreover, when it installs in the vertical direction upper direction, the dust etc. which arise with a process will adhere easily, and the necessity of the regular maintenance for removing the adhering dust arises. In particular, when slag is discharged from a refining vessel such as a converter, a large amount of dust or the like is generated, which may increase the frequency of maintenance. Furthermore, since the microwave rangefinder is an expensive facility, the installation cost increases.

Further, the methods described in Patent Documents 2 and 3 cannot accurately detect the slag forming phenomenon and the start timing of the slag discharge operation (also referred to as “exhaust”). As described above, the slag after the oxidative refining process accommodated in the slag pan is formed by the CO gas bubbles contained therein. For this reason, slag foaming can be sedated by injecting a forming sedative into the slag pan at the time when excretion starts, but if the timing of excretion start cannot be detected automatically, Detection work is required. In the methods described in Patent Documents 2 and 3, the slag discharged into the slag pan and the slag scattered from the converter, the state in which the slag is accommodated in the slag pan, and the new slag in the slag pan in which the slag is accommodated It cannot be distinguished from the contained state. For this reason, in the methods described in Patent Documents 2 and 3, since the timing of the start of excretion cannot be detected automatically, the forming sedative agent charging process becomes complicated.
Therefore, the present invention has been made paying attention to the above-described problems, and provides a method and an apparatus for charging a slag forming sedative that can calm down the forming of discharged slag inexpensively and easily. It is an object.

  According to one aspect of the present invention, when discharging the slag from the first container containing the slag and storing it in the second container, the first field of view through which the exhaust flow passes from the first container, and the second container The second visual field inside each of the first visual field and the second visual field are detected, and the discharge of slag is detected based on the luminance information of the imaging results of both the first visual field and the second visual field, and the slag forming is performed based on the detection result of the slag discharge There is provided a method for charging a slag forming sedative characterized by charging a sedative into a second container.

  Moreover, according to one aspect of the present invention, the first imaging unit that images the first field of view through which the waste flow discharged from the first container that stores the slag passes, and the slag discharged from the first container are stored. A second imaging unit that images a second visual field inside the second container, an image processing unit that detects discharge of slag based on luminance information of imaging results of both the first imaging unit and the second imaging unit, There is provided a slag forming sedative feeding device characterized by comprising a slag forming sedative in a second container based on a detection result of an image processing unit.

  According to one embodiment of the present invention, the forming of discharged slag can be sedated inexpensively and easily.

It is the schematic which shows the injection | throwing-in apparatus of the slag forming sedative which concerns on one Embodiment of this invention. It is a flowchart which shows the injection | throwing-in method of the slag forming sedative. It is the schematic which shows the modification of the injection device of the slag forming sedative.

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. However, it will be apparent that one or more embodiments may be practiced without such specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
<Device configuration>
First, with reference to FIG. 1, the structure of the injection device of the slag S forming sedative according to one embodiment of the present invention will be described. The forming sedative charging device is provided in the converter 1 as the first container. In the converter 1, a desiliconization process or a dephosphorization process is performed as a hot metal preliminary process. After the pretreatment, the converter 1 is tilted from the upright position around the trunnions 11 provided at both ends of the side surface, and the hot metal is discharged from the steel outlet 12 to a hot metal pan (not shown) provided below. Is done. After the hot metal is discharged, the converter 1 is returned to the upright position. And after the slag pan 2 which is a 2nd container is distribute | arranged to the downward direction of the converter 1, the slag S is discharged | emitted from the steel outlet 12 to the slag pan 2 by tilting the converter 1 again.

As shown in FIG. 1, the forming sedative charging device includes a first imaging unit 3a, a second imaging unit 3b, a sedative charging unit 4, a control unit 5, a first display unit 6, and a storage unit. 7 and the second display unit 8.
The first imaging unit 3 a is an imaging device such as a CCD camera, and is provided at a position above the slag pan 2 and away from the slag pan 2 in the horizontal direction. Moreover, the 1st imaging part 3a is provided in the position which can image the waste flow of the slag S discharged | emitted from the steel outlet 12 of the converter 1, and images the 1st visual field 31a containing the waste flow of the slag S To do.

  Similar to the first imaging unit 3a, the second imaging unit 3b is an imaging device such as a CCD camera, and is provided at a position above the slag pan 2 and away from the slag pan 2 in the horizontal direction. The second imaging unit 3b is provided at a position where at least the inside of the slag pan 2 can be imaged, and images the second visual field 31b including the inside of the slag pan 2. The second visual field 31b preferably includes the entire interior of the slag pan 2.

  The first and second imaging units 3 a and 3 b are connected to the control unit 5 and transmit the imaging result to the control unit 5. In addition, the position where the first and second imaging units 3a and 3b are provided may be provided at a position away from the slag pan 2 to the extent that there is no influence of dust or the like generated when the slag S is discharged from the converter. preferable. Furthermore, the first and second imaging units 3a and 3b may be provided with devices for blowing a gas such as air to the lenses of the first and second imaging units 3a and 3b. By providing such devices in the first and second imaging units 3a and 3b, it is possible to prevent corrosion due to accumulation of dust generated due to waste or the like, narrowing of the imaging field of view, and the like.

  The sedative charging unit 4 is a device that inputs a forming sedative into the slag pan 2. The sedative charging unit 4 inputs a predetermined amount of forming sedative into the slag pan 2 in accordance with an instruction from the control unit 5. In the present embodiment, wood chips having substantially constant dimensions are used as the forming sedative. In addition, the sedative feeding unit 4 feeds a predetermined number of pieces of wood into the slag pan 2 as a predetermined amount of forming sedative. The optimum number of pieces of wood to be charged is appropriately selected according to the amount and properties of the slag S generated in the converter 1. Furthermore, the sedative charging unit 4 has a chute 41 that extends upward from the slag pan 2, and feeds the forming sedative into the slag pan 2 through the chute 41.

  The control unit 5 includes an image processing unit 51 and an input control unit 52. The image processing unit 51 is connected to the first and second imaging units 3a and 3b, respectively, and acquires the imaging results of the first and second imaging units 3a and 3b. Further, the image processing unit 51 determines the start and end of excretion by a method described later based on the imaging results of the first and second imaging units 3 a and 3 b, and transmits the determination result to the input control unit 52. Further, the image processing unit 51 is connected to the first display unit 6 and the storage unit 7, and transmits the imaging results and determination results of the first and second imaging units 3 a and 3 b to the first display unit 6 and the storage unit 7. . The input control unit 52 is connected to the sedative agent input unit 4 and controls the sedative agent input operation of the sedative agent input unit 4 based on the determination result acquired from the image processing unit 51. Furthermore, the input control unit 52 is connected to the second display unit 8 and transmits the operation status of the sedative agent input unit 4 to the second display unit 8.

  The first display unit 6 is a display device such as a monitor, and displays the imaging results of the first and second imaging units 3 a and 3 b acquired from the image processing unit 51 and the determination result of the image processing unit 51. The storage unit 7 stores the imaging results of the first and second imaging units 3 a and 3 b acquired from the image processing unit 51 and the determination result of the image processing unit 51. The second display unit 8 is a display device such as a monitor or a lamp, and displays information such as the input operation of the sedative agent input unit 4 and the amount of forming sedative agent input.

<How to add sedatives>
Next, with reference to FIG. 1 and FIG. 2, the injection | throwing-in method of the forming sedative of slag S which concerns on this embodiment is demonstrated. The forming sedative charging operation by the forming sedative charging device is started after the converter 1 is subjected to the desiliconization process or the dephosphorization process and the processed molten iron is discharged from the converter 1. First, as shown in FIG. 2, the first and second imaging units 3a and 3b image the first and second visual fields 31a and 31b, respectively (S100). The first and second imaging units 3a and 3b continuously capture the first and second visual fields 31a and 31b, respectively, until the series of processes illustrated in FIG. 2 is completed. The imaging results of the first and second visual fields 31a and 31b are transmitted to the image processing unit 51.

Next, the image processing unit 51 calculates first and second luminance values X and Y from the imaging results of the first and second visual fields 31a and 31b, respectively (S102). In step S <b> 102, the image processing unit 51 acquires a plurality of pieces of image data captured successively from the first and second imaging units 3 a and 3 b. Then, the first and second luminance values X and Y are calculated from N (N is an integer) continuous image data from the start of imaging. The first and second luminance values X and Y are average values of luminance per unit area of the imaging elements of the first and second imaging units 3a and 3b in the respective image data, and the first and second visual fields 31a and 31b. Are the average values of the N pieces of image data, and are calculated by the following formulas (1) and (2). By making the number N of image data to be used plural, the influence of flash light and the like can be reduced, and erroneous detection can be prevented. Incidentally, (1) In the equation, X is the first luminance value (cd / m ²⁾ and x _i is first captured in the image data captured to the i-th among consecutive N number of imaging result of the first field of view 31a The average value (cd / m ² ) of luminance per unit area of the image sensor of the unit 3a is shown. In Equation (2), Y is the second luminance value (cd / m ² ), and y _i is the second imaging in the image data captured i-th out of N consecutive imaging results of the second visual field 31b. The average value (cd / m ² ) of the luminance per unit area of the image sensor of the unit 3b is shown.

  Furthermore, the image processing unit 51 determines whether or not the slag S discharged from the converter 1 is detected based on the first and second luminance values X and Y (S104). In step S104, the detection of the slag S is determined based on whether or not both the first and second luminance values X and Y are equal to or greater than a threshold value. The threshold is a value set so that the discharged slag S can be detected, and an optimal value is appropriately set according to the first and second visual fields 31a and 31b. That is, in step S104, the image processing unit 51 determines that the slag S has been discharged from the converter 1 when both the first and second luminance values X and Y are equal to or greater than the threshold value. A different threshold may be used for each of the first and second luminance values X and Y.

  When the discharge of the slag S is detected in step S <b> 104, the image processing unit 51 transmits the determination result to the input control unit 52. Thereafter, the input control unit 52 controls the sedative agent input unit 4 based on the acquired determination result, and inputs the forming sedative into the slag pan 2 (S106). At this time, the sedative feeding unit 4 feeds a predetermined amount of forming sedative into the slag pan 2 through the chute 41. On the other hand, when the discharge of the slag S is not detected in step S104, a series of processes of steps S100, S102, and S104 are repeated.

  After the forming sedative is introduced in step S106, the image processing unit 51 acquires the imaging results of the first and second visual fields 31a and 31b after the forming sedative is introduced from the first and second imaging three parts a and 3b. Then, it is determined whether or not the evacuation operation has continued for a predetermined time (S108). In step S108, the image processing unit 51 repeatedly performs the same processing as in steps S102 and S104. That is, the image processing unit 51 calculates the first and second luminance values X and Y from the N captured images as in step S102. Then, similarly to step S104, the image processing unit 51 determines whether or not the first and second luminance values X and Y are both equal to or greater than a threshold value. Further, the image processing unit 51 repeats such an operation for a certain period of time, thereby determining whether or not both the first and second luminance values X and Y have exceeded a threshold value for a certain period of time or more. That is, the state where the first and second luminance values X and Y are equal to or greater than the threshold value is determined as the state where the exclusion is performed, and the first and second luminance values X and Y are equal to or greater than the threshold value. By determining the time, it is determined whether or not the evacuation operation has been continuously performed. The fixed time is a value determined from the amount of the forming sedative once charged, the discharge rate of the slag S, and the like, and is set by the time during which the forming is sedated by the single forming sedative.

In step S <b> 108, when the evacuation operation continues for a predetermined time, the image processing unit 51 transmits the determination result to the input control unit 52. Thereafter, the input control unit 52 controls the sedative agent input unit 4 based on the acquired determination result, and inputs the forming sedative into the slag pan 2 (S110). At this time, the sedative injection unit 4 inputs a predetermined amount of forming sedative into the slag pan 2 via the chute 41 as in step S106. Note that after step S110, the process of step S108 is repeated.
On the other hand, if the excretion operation does not continue for a certain time in step S108, it is determined that the excretion has ended, and the forming sedative injection operation by the forming sedative input device is completed.

<Modification>
Although the present invention has been described above with reference to specific embodiments, it is not intended that the present invention be limited by these descriptions. From the description of the invention, other embodiments of the invention will be apparent to persons skilled in the art, along with various variations of the disclosed embodiments. Therefore, it is to be understood that the claims encompass these modifications and embodiments that fall within the scope and spirit of the present invention.

  For example, in the said embodiment, as shown in FIG. 1, although slag S was discharged | emitted from the steel outlet 12 of the converter 1, this invention is not limited to this example. For example, as shown in FIG. 3, the slag S may be discharged from the furnace port 13 of the converter 1. In this case, the slag S is discharged from the furnace port 13 by tilting the converter 1 in the opposite direction to the case where the slag S is discharged from the steel outlet 12 as shown in FIG. Moreover, the 1st and 2nd imaging parts 3a and 3b are each provided in the position which can image the waste flow from the furnace port 13, and the position which can image the inside of the slag pan 2 similarly to the said embodiment. Furthermore, the control part 5 detects the start of waste by detecting the slag S discharged | emitted from the furnace port 13, like the said embodiment.

  Moreover, in the said embodiment, although it was set as the structure which uses the converter 1 as a 1st container, and the slag pan 2 as a 2nd container, this invention is not limited to this example. For example, the 1st container should just be a refining container in which processing with generation of slag S is performed, and may be containers, such as a topped car and a hot metal ladle. Moreover, the 2nd container should just be a container which can accommodate the slag S discharged | emitted from a 1st container, and things other than a pan-shaped container may be used.

  Further, in the above embodiment, the first and second luminance values X and Y are average values of luminance per pixel of the image data of the first and second visual fields 31a and 31b. It is not limited. For example, the first and second luminance values X and Y are values indicating the ratio of the number of pixels indicating a specific color indicating the slag S to the total number of pixels of the image data of the first and second visual fields 31a and 31b, respectively. There may be. In this case, in step S104, a value indicating the ratio of pixels of a specific color at the time of rejection is set as the threshold value.

  Furthermore, in the said embodiment, although it was set as the structure which uses wood as a forming sedative, this invention is not limited to this example. For example, as the forming soothing agent, a material containing carbon such as carbonaceous material or carbon powder that promotes aggregation of bubbles and destruction of foam may be used. In this case, the input control unit 52 controls the amount of forming sedative supplied from the sedative input unit 4.

  Furthermore, in the above embodiment, the forming sedative is charged by performing the series of processes shown in FIG. 2, but the present invention is not limited to this example. For example, the processing of steps S100, S102, S104, and S106 may be performed, and the processing of step S106 may be terminated, so that the forming sedative injection process may be terminated. Further, the forming sedative charging operation at the start of the excretion in step S106 may not be performed. That is, after step S100, the processes in and after step S108 may be performed without performing the processes in steps S102, S104, and S106.

<Effect of embodiment>
(1) The method of charging the forming sedative of slag S according to one aspect of the present invention is such that the slag is discharged from the first container such as the converter 1 that accommodates the slag S and accommodated in the second container such as the slag pan 2. When the first visual field 31a and the second visual field 31b inside the second container are imaged (step S100), the first visual field 31a and the second visual field 31b are captured. The discharge of the slag S is detected based on the luminance information of both imaging results (steps S102, S104, S108), and the slag S forming sedative is put into the second container based on the detection result of the slag S discharge. (Steps S106, S110).

  Here, when the discharge of the slag S is detected by monitoring only the discharge flow of the first visual field 31a, the slag S scattered from the furnace port 13 of the converter 1 and the slag S discharged by the discharge operation are detected. Cannot be identified. Moreover, when detecting discharge | emission of the slag S by monitoring only the inside of the slag pan 2 of the 2nd visual field 31b, the discharged slag S and the slag S already accommodated in the slag pan 2 cannot be identified. For example, when the slag S generated in the previous process is already accommodated in the slag pan 2, the start of discharge cannot be detected even if the newly generated slag S is discharged to the slag pan 2. On the other hand, according to the above configuration, by monitoring both the first and second visual fields 31a and 31b, it is possible to eliminate the exclusion compared to the case of monitoring either one of the first and second visual fields 31a and 31b. Detection accuracy can be improved. Moreover, according to the said structure, the timing of the start of excretion can be detected automatically and a foaming sedative can be supplied automatically. For this reason, it is possible to reduce the work load of the operator such as the visual detection operation of the excretion and the injection operation of the forming sedative.

  Moreover, according to the said structure, discharge | emission of the slag S is detected by imaging the 1st and 2nd visual fields 31a and 31b. For this reason, unlike patent document 1, it is not necessary to provide expensive facilities, such as a microwave distance meter. Furthermore, since it is only necessary to be able to image the waste flow and the inside of the slag pan 2, compared to Patent Document 1 in which a microwave rangefinder is provided in the upper part of the second container in the vertical direction (first and second imaging). There are few restrictions of the place to install part 3a, 3b), and it can install in a place with little influence of dust generation. For this reason, the cost for installation and the cost of maintenance can be reduced.

(2) When detecting the discharge of the slag S, the first luminance value X and the second luminance value Y indicating the average luminance of the imaging result are calculated from the imaging results in the first visual field 31a and the second visual field 31b, respectively ( Thereafter, when both the first luminance value X and the second luminance value Y are equal to or greater than the threshold value, the discharge of the slag S is detected (steps S104 and S108).
According to the said structure, it can be set as a simple system structure and discharge | emission of the slag S can be detected with high precision.

(3) When the forming sedative is introduced into the second container, the forming sedative is introduced into the second container when the start of the discharge of the slag S is detected (step S106).
(4) When the forming sedative is put into the second container, if the slag S is continuously discharged for a predetermined time or more, the forming sedative is put into the second container (step S110).
According to the configurations of (3) and (4) above, the forming sedative can be introduced at an arbitrary timing from the start to the end of excretion.

(5) The slag S forming sedative charging device according to one aspect of the present invention is configured to capture the first field of view 31a through which the exhaust flow discharged from the first container accommodating the slag S passes. 3a, the second imaging unit 3b that images the second visual field 31b inside the second container that houses the slag S discharged from the first container, and the imaging of both the first imaging unit 3a and the second imaging unit 3b An image processing unit 51 that detects the discharge of the slag S based on the luminance information of the result, a charging control unit 52 that controls the charging operation of the forming sedative of the slag S based on the detection result of the image processing unit 51, and a charging Based on an instruction from the control unit 52, the sedative agent charging unit 4 that charges the forming sedative into the second container is provided.
According to the said structure, the effect similar to the structure of (1) can be acquired.

  Examples performed by the present inventors will be described. In the examples, the slag S was discharged from the converter 1 using the forming sedative charging device and the charging method shown in FIGS. 1 and 2. At this time, the converter 1 was tilted so that the discharge speed of the slag S was substantially constant, and the waste was discharged. In addition, as a comparative example, the waste treatment was performed in the same manner while visually confirming the forming of the slag S without adding the forming sedative. In the comparative example, the slag S formed from the slag pan 2 was discharged while adjusting the discharge rate of the slag S from the converter 1 so as not to flow out.

  In the examples, it was confirmed that the forming sedative can be automatically charged by automatically detecting the discharge of the slag S by using the slag S forming sedative charging device and the charging method according to one embodiment of the present invention. Moreover, in the Example, it has confirmed that the forming of the slag S was sedated and the outflow of the slag S from the slag pan 2 could be prevented by introducing the forming sedative. Table 1 shows the time (exclusion time) required for the elimination process in Examples and Comparative Examples. In the example, it was not necessary to adjust the discharge speed, so it was confirmed that the discharge time could be shortened by 3.4 minutes compared to the comparative example.

  From the above results, it was confirmed that according to the slag S forming sedative charging device and the charging method according to one aspect of the present invention, it can be sedated inexpensively and easily.

DESCRIPTION OF SYMBOLS 1 Converter 11 Trunnion 12 Steel outlet 13 Furnace port 2 Slag pan 3a 1st imaging part 31a 1st visual field 3b 2nd imaging part 31b 2nd visual field 4 Sedative injection part 41 Chute 5 Control part 51 Image processing part 52 Input control part 6 1st display part 7 Storage part 8 2nd display part S Slag

Claims (5)

When discharging the slag from the first container containing the slag and storing it in the second container,
Imaging a first field of view through which the exhaust flow passes from the first container and a second field of view inside the second container,
Detecting discharge of the slag based on luminance information of imaging results of both the first visual field and the second visual field;
A method for charging a slag forming sedative, wherein the slag forming sedative is charged into the second container based on a detection result of the slag discharge.   When detecting the discharge of the slag, the first luminance value and the second luminance value indicating the average luminance of the imaging result are calculated from the imaging results in the first visual field and the second visual field, respectively, The method for feeding a slag forming sedative according to claim 1, wherein the discharge of the slag is detected when both of the first luminance value and the second luminance value are equal to or greater than a threshold value.   3. The forming sedative is introduced into the second container when the start of discharging the slag is detected when the forming sedative is introduced into the second container. 4. The method for charging the slag forming sedative as described.   When the forming sedative is charged into the second container, the forming sedative is charged into the second container when the slag is continuously discharged for a predetermined time or longer. Item 4. A method for charging a slag forming sedative according to any one of Items 1 to 3. A first imaging unit that images a first field of view through which a waste stream discharged from a first container that houses slag passes;
A second imaging unit that images a second visual field inside the second container that houses the slag discharged from the first container;
An image processing unit that detects discharge of the slag based on luminance information of imaging results of both the first imaging unit and the second imaging unit;
Based on the detection result of the image processing unit, a charging control unit that controls the charging operation of the slag forming sedative, and
A slag forming sedative charging device, comprising: a sedative charging unit for charging the forming sedative into the second container based on an instruction from the charging control unit.

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