CN109190618B - High-temperature molten slag flow measuring device and method based on image recognition technology - Google Patents
High-temperature molten slag flow measuring device and method based on image recognition technology Download PDFInfo
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Abstract
The invention discloses a device and a method for measuring the flow of high-temperature molten slag based on an image recognition technology; a high-temperature molten slag flow measuring device based on an image recognition technology comprises a middle buffer device and a granulating bin body; the slag in the intermediate buffer device flows to the granulator through the slag outlet, and a high-temperature slag liquid column is formed between the slag outlet and the granulator; the method is characterized in that: a high-speed camera is arranged in the granulating bin body, and a camera of the high-speed camera corresponds to the high-temperature slag liquid column; a water-cooling shell sleeve is arranged outside the high-speed camera, and cooling water in the water-cooling shell sleeve is driven by a circulating water pump; the high-speed camera transmits the high-temperature molten slag liquid column image to the computer through a data transmission line; a liquid column edge identification module, a liquid column diameter calculation module, a color threshold segmentation module, a characteristic point position identification module, a characteristic point speed calculation module and a flow calculation module are arranged in the computer; the invention can be widely applied to the fields of steel, metallurgy and the like to measure the flow of the high-temperature molten fluid.
Description
Technical Field
The invention relates to a high-temperature molten slag flow measuring device and method, in particular to a high-temperature molten slag flow measuring device and method based on an image recognition technology.
Background
A large amount of high-temperature slag is generated in the blast furnace ironmaking process, and is treated by a water quenching method at present, so that the obtained slag particles with high vitreous body content can be used as a cement additive, but the method generates huge energy waste and generates a series of problems of water resource waste, environmental pollution and the like.
In order to solve the defects of the water quenching treatment method of the high-temperature slag, a plurality of high-temperature slag dry treatment methods are carried out. Common dry treatment methods for high-temperature molten slag include a rotary drum method, a wind quenching and granulating method, a centrifugal stirring method and the like. The slag centrifugal granulation waste heat recovery technology is one of the most promising high-temperature slag dry treatment methods. The main process is as follows: high-temperature blast furnace slag intermittently discharged from a blast furnace enters an intermediate buffer device, continuously flows out from a slag outlet at the lower end of the intermediate buffer device due to the action of gravity, forms a high-temperature slag liquid column, flows to a high-speed rotating granulator, and is spread, granulated and the like under the centrifugal action of the granulator. Slag particles obtained by granulating the liquid molten slag fly out from the edge of the granulator, fall down after impacting a granulating cabin body, and then the waste heat of the slag particles is recovered by using moving beds or fluidized beds and the like. And for the cooling slag particles, the cooling slag particles can be used for manufacturing cement fillers, so that resource utilization is realized.
The slag centrifugal granulation waste heat recovery technology has the advantages of compact structure, low energy consumption, small diameter of formed particles and the like, and is widely concerned at home and abroad.
However, the slag centrifugal granulation waste heat recovery technology needs to keep the slag flow stable, and the instability of the flow easily causes serious consequences such as particle adhesion, large slag wool generation amount, and reduced waste heat recovery efficiency. However, the flow of the high-temperature slag cannot be measured at present, and thus the flow cannot be regulated.
Disclosure of Invention
The invention aims to provide a high-temperature slag flow measuring device and method based on an image recognition technology.
In order to solve the above technical problem, a first technical solution of the present invention is: a high-temperature molten slag flow measuring device based on an image recognition technology comprises a middle buffer device and a granulating bin body; a granulator is arranged in the granulating bin body, a slag outlet is arranged at the lower end of the intermediate cache device, the slag outlet corresponds to the granulator, molten slag in the intermediate cache device flows to the granulator through the slag outlet, and a high-temperature molten slag liquid column is formed between the slag outlet and the granulator; the method is characterized in that: a high-speed camera is arranged in the granulating bin body, and a camera of the high-speed camera corresponds to the high-temperature slag liquid column; to shoot high temperature slag liquid column images; the temperature in the granulating bin body is high, a water-cooling shell sleeve is arranged outside the high-speed camera for protecting the high-speed camera, and cooling water in the water-cooling shell sleeve is driven by a circulating water pump.
And the high-speed camera transmits the high-temperature molten slag liquid column image to a computer through a data transmission line.
The computer is internally provided with a liquid column edge identification module, a liquid column diameter calculation module, a color threshold segmentation module, a characteristic point position identification module, a characteristic point speed calculation module and a flow calculation module.
The liquid column edge identification module is used for identifying the edge of the high-temperature molten slag liquid column image by using an edge identification function.
The liquid column diameter calculation module is used for selecting a horizontal plane as a characteristic section in the height direction of the high-temperature molten slag liquid column, and the horizontal distance between the two molten slag liquid column edges at the height of the characteristic section is the molten slag liquid column diameter.
The color threshold segmentation module is used for taking the adjacent area of the characteristic section as an interested area according to the correlation function of the color threshold segmentation, then giving the RGB value range of the characteristic point, carrying out the color threshold segmentation, and taking the point with the color meeting the RGB value range as the characteristic point in the interested area.
The feature point position identification module is used for identifying the feature points frame by frame to obtain the coordinates of the same feature point on each frame image.
The characteristic point speed calculation module is used for calculating the moving speed of the characteristic points according to a frame difference method; the moving speed of the characteristic point is the flowing speed of the liquid column.
And the flow calculation module is used for calculating the flow of the molten slag liquid column according to the diameter and the flowing speed of the liquid column at the characteristic section.
According to the preferable scheme of the high-temperature slag flow measuring device based on the image recognition technology, the data transmission line is wrapped by a temperature-resistant material.
The second technical scheme of the invention is as follows: a high-temperature molten slag flow measuring method based on an image recognition technology is characterized in that: the method comprises the following steps:
and shooting the high-temperature slag liquid column by using a high-speed camera to obtain an image of the high-temperature slag liquid column.
And identifying the image edge by using an edge identification function.
And selecting a horizontal plane as a characteristic section in the height direction of the image, wherein the horizontal distance between the edges of the two slag liquid columns at the height of the characteristic section is the diameter of the slag liquid column.
And taking the adjacent area of the characteristic section as an interested area, giving an RGB value range of the characteristic point, carrying out color threshold segmentation according to a correlation function of the color threshold segmentation, and taking a point with the color meeting the RGB value range as the characteristic point in the interested area.
And identifying the feature points frame by frame to obtain the coordinates of the same feature point on each frame image.
Calculating the moving speed of the feature points according to a frame difference method; the moving speed of the characteristic point is the flowing speed of the liquid column.
And calculating the flow of the slag liquid column according to the diameter of the liquid column at the characteristic section and the flowing speed.
The high-temperature blast furnace slag intermittently discharged from the blast furnace enters the intermediate cache device, and continuously flows out from a slag outlet at the lower end of the intermediate cache device to the granulator due to the action of gravity, and forms a high-temperature slag liquid column. Meanwhile, the slag liquid column has strong corrosivity and can corrode a flowing part of the slag liquid column, so that the liquid column contains a small amount of impurity characteristic particles, and the impurity characteristic particles are different in color from a main slag liquid column when flowing due to different luminous frequencies of different substances. According to the characteristics, a high-speed camera is used for shooting the slag liquid column at a high frame rate and in a low exposure time, the impurity characteristic particles are identified by using an image identification technology, and the positions of the impurity characteristic particles are analyzed frame by frame so as to calculate the liquid flow speed; meanwhile, under the condition of low exposure time, the background is pure black, the liquid column is bright red, and the edge contour of the slag liquid column is identified by utilizing an image identification technology to obtain the diameter of the liquid column. According to the speed and the diameter information, the real-time detection of the flow of the high-temperature molten slag can be realized.
The device and the method for measuring the flow of the high-temperature molten slag based on the image recognition technology have the beneficial effects that: the method uses the high-speed camera to shoot the molten slag liquid column, and utilizes the image recognition technology to recognize the impurity characteristic particles and the edge profile of the molten slag liquid column, thereby realizing the measurement of the high-temperature molten slag flow in the centrifugal granulation system and providing a basis for the regulation and control of the high-temperature molten slag flow; the invention also provides a feasible scheme for shooting by using a high-speed camera in a high-temperature environment in the granulation chamber; the invention can be widely applied to the flow measurement of high-temperature molten fluid in the fields of steel, metallurgy and the like.
Drawings
Fig. 1 is a schematic structural diagram of a high-temperature slag flow measuring device based on an image recognition technology according to the present invention.
Fig. 2 is a schematic flow chart of a high-temperature slag flow measuring method based on an image recognition technology.
Fig. 3 is a photograph of a simulated slag flow taken with a high-speed camera.
Detailed Description
Example 1: referring to fig. 1 and 2, a high-temperature molten slag flow measuring device based on an image recognition technology comprises an intermediate buffer device 1 and a granulation cabin body 11; a granulator 4 is arranged in the granulating bin body 11, a slag outlet 2 is arranged at the lower end of the intermediate buffer memory device, the slag outlet 2 corresponds to the granulator 4, molten slag in the intermediate buffer memory device 1 flows to the granulator 4 through the slag outlet 2, and a high-temperature molten slag liquid column 3 is formed between the slag outlet 2 and the granulator 4; a high-speed camera 6 is arranged in the granulating bin body 11, and a camera of the high-speed camera 6 corresponds to the high-temperature slag liquid column 3; to shoot a high-temperature slag liquid column 3 image; the temperature in the granulating bin body is high, in order to protect the high-speed camera 6, a water-cooling shell cover 5 is arranged outside the high-speed camera 6, and cooling water in the water-cooling shell cover 5 is circularly driven by a circulating water pump 8 through a water pipe 7.
The high-speed camera 6 transmits the high-temperature slag liquid column 3 image to the computer 10 through a data transmission line 9; the data transmission line 9 is wrapped by a temperature-resistant material.
The computer 10 is internally provided with a liquid column edge identification module, a liquid column diameter calculation module, a color threshold segmentation module, a characteristic point position identification module, a characteristic point speed calculation module and a flow calculation module.
The liquid column edge identification module is used for identifying the edge of the image of the high-temperature slag liquid column 3 by using an edge identification function.
The liquid column diameter calculation module is used for selecting a horizontal plane as a characteristic section in the height direction of the high-temperature molten slag liquid column, and the horizontal distance between the two molten slag liquid column edges at the height of the characteristic section is the molten slag liquid column diameter.
The color threshold segmentation module is used for taking the adjacent area of the characteristic section as an interested area according to the correlation function of the color threshold segmentation, then giving the RGB value range of the characteristic point, carrying out the color threshold segmentation, and taking the point with the color meeting the RGB value range as the characteristic point in the interested area.
The feature point position identification module is used for identifying the feature points frame by frame to obtain the coordinates of the same feature point on each frame image.
The characteristic point speed calculation module is used for calculating the moving speed of the characteristic points according to a frame difference method; the moving speed of the characteristic point is the flowing speed of the liquid column.
And the flow calculation module is used for calculating the flow of the molten slag liquid column according to the diameter and the flowing speed of the liquid column at the characteristic section. The resulting flow data is displayed on a computer display.
shooting the high-temperature slag liquid column 3 through a high-speed camera 6 to obtain an image of the high-temperature slag liquid column 3;
and identifying the image edge by using an edge identification function.
And selecting a horizontal plane as a characteristic section in the height direction of the image, wherein the horizontal distance between the edges of the two slag liquid columns at the height of the characteristic section is the diameter of the slag liquid column.
And taking the adjacent area of the characteristic section as an interested area, giving an RGB value range of the characteristic point, carrying out color threshold segmentation according to a correlation function of the color threshold segmentation, and taking a point with the color meeting the RGB value range as the characteristic point in the interested area.
And identifying the feature points frame by frame to obtain the coordinates of the same feature point on each frame image.
Calculating the moving speed of the feature points according to a frame difference method; the moving speed of the characteristic point is the flowing speed of the liquid column.
And calculating the flow of the slag liquid column according to the diameter of the liquid column at the characteristic section and the flowing speed.
Referring to fig. 3, fig. 3 is a photograph of a simulated slag flow taken by a high-speed camera, a horizontal plane is selected in the height direction of the photograph as a characteristic section, edges and the environment are identified by using an edge identification function through a given critical gray value, and the horizontal distance between two slag liquid column edges at the height of the characteristic section is calculated and obtained and is the diameter of the slag liquid column; giving the RGB value range of the characteristic points, using a threshold segmentation function, taking the points with colors conforming to the RGB value range as the characteristic points, acquiring the coordinates of the characteristic points frame by frame, and calculating the moving speed of the characteristic points to obtain the flow velocity of the liquid column; and calculating the flow by taking the diameter and the flow speed as calculation basis. With this method, the error is less than 5%.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (3)
1. A high-temperature molten slag flow measuring device based on an image recognition technology comprises an intermediate buffer device (1) and a granulating bin body (11); a granulator (4) is arranged in the granulating bin body (11), a slag outlet (2) is arranged at the lower end of the intermediate buffer device, the slag outlet (2) corresponds to the granulator (4), molten slag in the intermediate buffer device (1) flows to the granulator (4) through the slag outlet (2), and a high-temperature molten slag liquid column (3) is formed between the slag outlet (2) and the granulator (4); the method is characterized in that: a high-speed camera (6) is arranged in the granulating bin body (11), and a camera of the high-speed camera (6) corresponds to the high-temperature slag liquid column (3); to shoot the image of the high-temperature slag liquid column (3); a water-cooling shell cover (5) is arranged outside the high-speed camera (6), and cooling water in the water-cooling shell cover (5) is driven by a circulating water pump (8);
the high-speed camera (6) transmits the image of the high-temperature slag liquid column (3) to the computer (10) through a data transmission line (9);
a liquid column edge identification module, a liquid column diameter calculation module, a color threshold segmentation module, a characteristic point position identification module, a characteristic point speed calculation module and a flow calculation module are arranged in the computer (10);
the liquid column edge identification module is used for identifying the image edge of the high-temperature slag liquid column (3) by using an edge identification function;
the liquid column diameter calculation module is used for selecting a horizontal plane as a characteristic section in the height direction of the high-temperature molten slag liquid column, and the horizontal distance between the two molten slag liquid column edges at the height of the characteristic section is the molten slag liquid column diameter;
the color threshold segmentation module is used for taking the adjacent area of the characteristic section as an interested area according to a correlation function of color threshold segmentation, then giving the RGB value range of the characteristic point, carrying out color threshold segmentation, and taking the point with the color meeting the RGB value range as the characteristic point in the interested area;
the characteristic point position identification module is used for identifying the characteristic points frame by frame to obtain the coordinates of the same characteristic point on each frame image;
the characteristic point speed calculation module is used for calculating the moving speed of the characteristic points according to a frame difference method; the moving speed of the characteristic point is the flowing speed of the liquid column;
the flow calculation module is used for calculating the flow of the slag liquid column according to the diameter and the flowing speed of the liquid column at the characteristic section.
2. The high-temperature slag flow measurement device based on the image recognition technology according to claim 1, characterized in that: the data transmission line (9) is wrapped by a temperature-resistant material.
3. A high-temperature molten slag flow measuring method based on an image recognition technology is characterized in that: the method comprises the following steps:
shooting the high-temperature slag liquid column (3) through a high-speed camera (6) to obtain an image of the high-temperature slag liquid column (3);
identifying the image edge by using an edge identification function;
selecting a horizontal plane as a characteristic section in the height direction of the image, wherein the horizontal distance between the edges of two slag liquid columns at the height of the characteristic section is the diameter of the slag liquid column;
taking the adjacent area of the characteristic section as an interested area, then giving the RGB value range of the characteristic point, carrying out color threshold segmentation according to the correlation function of the color threshold segmentation, and taking the point with the color meeting the RGB value range as the characteristic point in the interested area;
identifying the feature points frame by frame to obtain the coordinates of the same feature point on each frame image;
calculating the moving speed of the feature points according to a frame difference method; the moving speed of the characteristic point is the flowing speed of the liquid column;
and calculating the flow of the slag liquid column according to the diameter of the liquid column at the characteristic section and the flowing speed.
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