CN113177951B - Device and method for non-contact measurement of content of incompatible gas-liquid two-phase mixed gas - Google Patents
Device and method for non-contact measurement of content of incompatible gas-liquid two-phase mixed gas Download PDFInfo
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Abstract
The invention discloses a device and a method for non-contact measurement of the content of incompatible gas-liquid two-phase mixed gas, wherein the method comprises the following steps: collecting video data in an incompatible gas-liquid two-phase mixing process, carrying out image segmentation on the video data to obtain a binary pattern of the incompatible gas-liquid two-phase mixing process, and calculating the gas content of a gas-liquid mixture at the position close to the wall based on the binary pattern; closing the air inlet valve, simultaneously acquiring the overflow amount of gas in the liquid working medium in the gas-liquid mixing stirrer through the gas flow measuring meter, and calculating the gas content coefficient in the gas-liquid mixing stirrer based on the overflow amount; and solving the real gas content of the gas-liquid two-phase mixture in the gas-liquid mixing stirrer based on the gas content coefficient and the gas content of the gas-liquid mixture at the position close to the wall. The method has strong practicability, can intuitively and accurately calculate the gas content in the incompatible-gas-liquid two-phase mixing process, and can be applied to various fields such as chemical industry, wet metallurgy and the like.
Description
Technical Field
The invention relates to the technical field of biological, chemical and hydrometallurgical engineering, in particular to a device and a method for measuring the content of incompatible gas-liquid two-phase mixed gas in a non-contact manner.
Background
The percentage of the gas phase to the volume of the gas-liquid mixture is referred to as the gas holdup. The gas content is one of the evaluation methods of the multiphase flow stirring and mixing effect. The current methods for measuring gas content mainly comprise: differential pressure method, volume expansion method, double-conductive probe method and gamma ray projection method. The differential pressure method is mainly used for measuring the local gas content; the volume expansion method is inconvenient to operate in the actual test process; the double-conductance probe method can measure the size of bubbles, but the intrusion of the probe disturbs a gas-liquid mixed flow field; the gamma ray projection method can calculate the local gas content in the field according to the ray attenuation intensity of the empty field and the full field of the gas-liquid mixing experimental device and the ray attenuation intensity of the gas-liquid mixing state.
With the development of image processing technology and the need of non-invasive measurement in recent years, a high-speed camera is used for shooting a gas-liquid mixing process, and then a method for obtaining a gas content rate through image analysis and processing gradually enters the field of vision of people. However, the gas content obtained by the method is only the gas content near the wall surface, namely the local gas content. Therefore, it is necessary to provide a device and a method for non-contact measurement of the content of an incompatible gas-liquid two-phase mixture.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the gas content of incompatible gas-liquid two-phase mixed gas in a non-contact manner, which have strong practicability, can intuitively and accurately calculate the gas content in the incompatible-gas-liquid two-phase mixing process, and can be applied to various fields such as chemical industry, wet metallurgy and the like.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a device for measuring the content of incompatible gas-liquid two-phase mixed gas in a non-contact way, which comprises: an air pump, an air inlet pipe and a gas-liquid mixing stirrer; the air pump is connected with the bottom of the gas-liquid mixing stirrer through the air inlet pipe, the air inlet pipe is provided with an air inlet valve, one end of the air inlet pipe, which is connected with the gas-liquid mixing stirrer, is provided with a nozzle, and the nozzle is arranged inside the gas-liquid mixing stirrer; the upper end of the gas-liquid mixing stirrer is provided with a gas outlet; a gas flow meter is arranged at the gas outlet; and an image acquisition device is arranged on one side of the gas-liquid mixing stirrer.
Liquid is arranged in the gas-liquid mixing stirrer, the gas pump is used for introducing gas into the gas-liquid mixing stirrer through the gas inlet pipe, and the gas is incompatible with the liquid; the gas-liquid mixing stirrer is used for mixing the liquid and the gas; the image acquisition device is used for acquiring video data in an incompatible gas-liquid two-phase mixing process; the gas outlet is used for overflowing gas in the gas-liquid mixing stirrer; and the gas flow measuring meter is used for measuring the overflow amount of gas in the liquid working medium in the gas-liquid mixing stirrer.
Preferably, a white board is further disposed on one side of the gas-liquid mixing stirrer, and the white board and the image acquisition device are disposed on two opposite sides of the gas-liquid mixing stirrer and are disposed correspondingly.
Preferably, the image capture device includes, but is not limited to, a high speed camera.
The invention also provides a method for non-contact measurement of the content of incompatible gas-liquid two-phase mixed gas, which comprises the following steps:
s1, collecting video data in the incompatible gas-liquid two-phase mixing process through the image collecting device, and carrying out image segmentation on the video data to obtain a binary pattern of the incompatible gas-liquid two-phase mixing process;
s2, calculating the gas content of the gas-liquid mixture at the near wall based on the binary pattern of the incompatible gas-liquid two-phase mixing process;
s3, closing the air inlet valve, meanwhile, obtaining the overflow amount of the gas in the liquid working medium in the gas-liquid mixing stirrer through the gas flow measuring meter, and calculating the gas content coefficient in the gas-liquid mixing stirrer based on the overflow amount;
and S4, solving the real gas content of the gas-liquid two-phase mixture in the gas-liquid mixing stirrer based on the gas content coefficient and the gas content of the gas-liquid mixture at the position close to the wall.
Preferably, in step S1, the mixture of the incompatible gas-liquid phases is a transparent or translucent liquid.
Preferably, in the step S2, the gas content q of the gas-liquid mixture at the near wallNear wall surfaceIs calculated as follows:
in the formula, RiIs the radius of the ith bubble, n is the number of bubbles in the binary pattern, and V is the volume of the pure liquid phase in the gas-liquid mixing stirrer.
Preferably, in the step S3, the gas content coefficient a in the gas-liquid mixing agitator is calculated as follows:
in the formula, v is the overflow amount of gas in the liquid working medium in the gas-liquid mixing stirrer; q. q.sMeasured in factIs the measured gas content of the gas-liquid mixture in the gas-liquid mixing stirrer.
Preferably, in the step S4, the real gas content q of the gas-liquid two-phase mixture in the gas-liquid mixing agitator isSynthesis ofIs calculated as follows:
qsynthesis of＝a×qNear wall surface。
The invention discloses the following technical effects:
the method comprises the steps of acquiring video data in an incompatible gas-liquid two-phase mixing process through an image acquisition device, carrying out image segmentation to obtain a binary pattern of the incompatible gas-liquid two-phase mixing process, calculating the gas content of a local gas-liquid mixture at the position close to the wall through the binary pattern, measuring a gas content coefficient through an experimental method, and obtaining a real gas content through the relation between the real gas content and the gas content coefficient as well as the local gas content, so that the global comprehensive measurement of the gas content is realized, the practicability is high, and the gas content in the incompatible gas-liquid two-phase mixing process can be intuitively and accurately obtained; meanwhile, the flow field is not interfered in the measuring process of the gas content, so that the non-invasive measurement of the gas content is realized; the gas content measuring method can be applied to various fields such as chemical industry, wet metallurgy and the like, for example, the gas-liquid direct contact heat exchange process, and can also be used for researching a water model of pyrometallurgy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of the apparatus for non-contact measurement of gas content in an incompatible gas-liquid two-phase mixing process according to the present invention;
FIG. 2 is a flow chart of a method for non-contact measurement of gas content in an incompatible gas-liquid two-phase mixing process according to the present invention;
FIG. 3 is a binary pattern of an incompatible gas-liquid two-phase mixing process in an embodiment of the present invention;
in the figure, 1 is an air pump, 2 is a white board, 3 is an air inlet pipe, 4 is a nozzle, 5 is a gas-liquid mixing stirrer, 6 is an air outlet, and 7 is an image acquisition device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, the present embodiment provides an apparatus for non-contact measurement of a gas content of an incompatible gas-liquid two-phase mixture, comprising:
the device comprises an air pump 1, a white board 2, an air inlet pipe 3, a gas-liquid mixing stirrer 5 and an image acquisition device 7; the air pump 1 is connected with the bottom of the gas-liquid mixing stirrer 5 through the air inlet pipe 3, an air inlet valve is arranged on the air inlet pipe 3, a nozzle 4 is arranged at one end, connected with the gas-liquid mixing stirrer 5, of the air inlet pipe 3, and the nozzle 4 is arranged inside the gas-liquid mixing stirrer 5; the upper end of the gas-liquid mixing stirrer 5 is provided with a gas outlet 6; a gas flow meter is arranged at the gas outlet 6; the white board 2 and the image acquisition device 7 are correspondingly arranged on two sides of the gas-liquid mixing stirrer 5.
Liquid is arranged in the gas-liquid mixing stirrer 5, and the gas pump 1 is used for introducing gas into the gas-liquid mixing stirrer 5 through the gas inlet pipe 3, wherein the gas is incompatible with the liquid; the gas-liquid mixing stirrer 5 is used for mixing the liquid and the gas; the image acquisition device 7 is used for acquiring video data in an incompatible gas-liquid two-phase mixing process; the white board 2 is used for providing a background in the video data acquisition process and ensuring the shooting definition of the video data; the gas outlet 6 is used for the overflow of the gas in the gas-liquid mixing stirrer 5; the gas flow meter is used for measuring the overflow amount of gas in the liquid working medium in the gas-liquid mixing stirrer 5.
In the embodiment, the high-speed camera is an ACS series camera, the full frame size is 1280 × 800 pixels, the acquisition speed is 10 ten thousand frames/second, and the image acquisition device can adapt to various severe conditions.
In a further optimized scheme, the container of the gas-liquid mixing stirrer 5 is made of transparent materials.
Referring to fig. 2, the present embodiment provides a method for non-contact measurement of a gas content of an incompatible gas-liquid two-phase mixture, which specifically includes the following steps:
s1, acquiring video data in the incompatible gas-liquid two-phase mixing process through the image acquisition device 7, and carrying out image segmentation on the video data to obtain a binary pattern of the incompatible gas-liquid two-phase mixing process;
in this embodiment, the video data is divided by frame or time, specifically, the KMPlayer software is used to divide the video data, or matlab software is used to divide the video data by using the coded codes, so as to obtain the divided images; and carrying out binarization processing on the segmented image by adopting a large law method to obtain a binary pattern in an incompatible gas-liquid two-phase mixing process. The mixture obtained by mixing the incompatible gas-liquid two phases is transparent or semitransparent liquid, so that the video data can be conveniently shot in the incompatible gas-liquid two-phase mixing process, and bubbles cannot be shot otherwise; the binary pattern obtained in this example is shown in fig. 3, where white is a gas phase (bubble) and black is a liquid phase in fig. 3.
S2, calculating the gas content of the gas-liquid mixture at the near wall based on the binary pattern of the incompatible gas-liquid two-phase mixing process; in this example, assuming that the shape of the bubble is spherical, the gas content q of the gas-liquid mixture at the near wallNear wall surfaceIs calculated as follows:
in the formula, RiIs the radius of the ith bubble, n is the number of bubbles in the binary pattern, and V is the volume of the pure liquid phase in the gas-liquid mixing agitator 5.
And S3, closing the air inlet valve, simultaneously obtaining the overflow volume v of the gas in the liquid working medium in the gas-liquid mixing stirrer 5 through the gas flow measuring meter, and calculating the gas content coefficient a in the gas-liquid mixing stirrer 5 based on the overflow volume v.
The gas content coefficient a is calculated as follows:
s4, gas content q based on gas content coefficient a and gas-liquid mixture near the wallNear wall surfaceTrue gas content q of gas-liquid two-phase mixture in the gas-liquid mixing agitator 5Synthesis ofThe solution is performed as shown in the following equation:
qsynthesis of＝a×qNear wall surface。
The invention has the following technical effects:
the method comprises the steps of acquiring video data in an incompatible gas-liquid two-phase mixing process through an image acquisition device, carrying out image segmentation to obtain a binary pattern of the incompatible gas-liquid two-phase mixing process, calculating the gas content of a local gas-liquid mixture at the position close to the wall through the binary pattern, measuring a gas content coefficient through an experimental method, and obtaining a real gas content through the relation between the real gas content and the gas content coefficient as well as the local gas content, so that the global comprehensive measurement of the gas content is realized, the practicability is high, and the gas content in the incompatible gas-liquid two-phase mixing process can be intuitively and accurately obtained; meanwhile, the flow field is not interfered in the measurement process of the gas content, so that the non-invasive measurement of the gas content is realized; the gas content measuring method can be applied to various fields such as chemical industry, wet metallurgy and the like, for example, the gas-liquid direct contact heat exchange process, and can also be used for researching a water model of pyrometallurgy.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. The device for measuring the content of incompatible gas-liquid two-phase mixed gas in a non-contact way is characterized by comprising the following components: an air pump (1), an air inlet pipe (3) and a gas-liquid mixing stirrer (5); the air pump (1) is connected with the bottom of the gas-liquid mixing stirrer (5) through the air inlet pipe (3), the air inlet pipe (3) is provided with an air inlet valve, one end of the air inlet pipe (3) connected with the gas-liquid mixing stirrer (5) is provided with a nozzle (4), and the nozzle (4) is arranged inside the gas-liquid mixing stirrer (5); the upper end of the gas-liquid mixing stirrer (5) is provided with a gas outlet (6); a gas flowmeter is arranged at the gas outlet (6); an image acquisition device (7) is arranged on one side of the gas-liquid mixing stirrer (5);
liquid is arranged in the gas-liquid mixing stirrer (5), the gas pump (1) is used for introducing gas into the gas-liquid mixing stirrer (5) through the gas inlet pipe (3), and the gas is incompatible with the liquid; the gas-liquid mixing stirrer (5) is used for mixing the liquid and the gas; the image acquisition device (7) is used for acquiring video data in an incompatible gas-liquid two-phase mixing process; the gas outlet (6) is used for overflowing gas in the gas-liquid mixing stirrer (5); the gas flow meter is used for measuring the overflow amount of gas in the liquid working medium in the gas-liquid mixing stirrer (5).
2. The device for non-contact measurement of the content of incompatible gas-liquid two-phase mixture according to claim 1, wherein a white board (2) is further disposed on one side of said gas-liquid mixing stirrer (5), and said white board (2) and said image capturing device (7) are disposed on opposite sides of said gas-liquid mixing stirrer (5) and are disposed correspondingly.
3. The device for non-contact measurement of the content of an incompatible gas-liquid two-phase mixture according to claim 1, wherein said image capturing device (7) comprises but is not limited to a high-speed camera.
4. The method for using the device for measuring the gas content of the incompatible gas-liquid two-phase mixture in a non-contact way according to any one of claims 1 to 3 is characterized by comprising the following steps:
s1, collecting video data in the incompatible gas-liquid two-phase mixing process through the image collecting device (7), and carrying out image segmentation on the video data to obtain a binary pattern of the incompatible gas-liquid two-phase mixing process;
s2, calculating the gas content of the gas-liquid mixture at the near wall based on the binary pattern of the incompatible gas-liquid two-phase mixing process;
s3, closing the air inlet valve, meanwhile, obtaining the overflow amount of the gas in the liquid working medium in the gas-liquid mixing stirrer (5) through the gas flow measuring meter, and calculating the gas content coefficient in the gas-liquid mixing stirrer (5) based on the overflow amount;
s4, solving the real gas content of the gas-liquid two-phase mixture in the gas-liquid mixing stirrer (5) based on the gas content coefficient and the gas content of the gas-liquid mixture near the wall.
5. The method for using the apparatus for non-contact measurement of gas content of incompatible gas-liquid two-phase mixture according to claim 4, characterized in that in said S1, the mixture obtained by mixing the incompatible gas-liquid two-phase is transparent or semitransparent liquid.
6. The method for using the device for non-contact measurement of the gas content of incompatible gas-liquid two-phase mixture according to claim 4, characterized in that in said S2, the gas content q of gas-liquid mixture at the near wall isNear wall surfaceIs calculated as follows:
in the formula, RiIs the radius of the ith bubble, n is the number of bubbles in the binary pattern, and V is the volume of the pure liquid phase in the gas-liquid mixing stirrer (5).
7. The method for non-contact measurement of gas content of incompatible gas-liquid two-phase mixture according to claim 6, characterized in that in said S3, the gas content coefficient a in said gas-liquid mixing agitator (5) is calculated as follows:
in the formula, v is the overflow amount of gas in the liquid working medium in the gas-liquid mixing stirrer (5); q. q.sMeasured in factIs the measured gas content of the gas-liquid mixture in the gas-liquid mixing stirrer (5).
8. The method for the non-contact measurement of the gas content of an incompatible gas-liquid two-phase mixture according to claim 7, wherein in said S4, the true gas content q of the gas-liquid two-phase mixture in said gas-liquid mixing agitator (5)Synthesis ofIs calculated as follows:
qsynthesis of＝a×qNear wall surface。
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