CN108444391B - Measuring device and measuring method for solid phase suspension height in multiphase transparent stirring kettle - Google Patents
Measuring device and measuring method for solid phase suspension height in multiphase transparent stirring kettle Download PDFInfo
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- CN108444391B CN108444391B CN201810216477.1A CN201810216477A CN108444391B CN 108444391 B CN108444391 B CN 108444391B CN 201810216477 A CN201810216477 A CN 201810216477A CN 108444391 B CN108444391 B CN 108444391B
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- 238000003756 stirring Methods 0.000 title claims abstract description 61
- 239000007790 solid phase Substances 0.000 title claims abstract description 51
- 239000000725 suspension Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007791 liquid phase Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 239000006228 supernatant Substances 0.000 claims description 16
- 239000011159 matrix material Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 238000011160 research Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000035772 mutation Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000000007 visual effect Effects 0.000 abstract description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/022—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of tv-camera scanning
Abstract
The invention discloses a measuring device and a measuring method for solid-phase suspension height in a multiphase transparent stirring kettle. The device comprises a rotation speed measuring instrument, a motor, a transparent stirring kettle, a distance reference object, a computer and a digital camera. The measuring method comprises the following steps: adding solid-liquid phase materials into a stirring kettle, placing a digital camera in front of the stirring kettle for shooting, and connecting a motor with a computer through a rotation speed measuring instrument; sticking a distance reference object at the liquid level of the solid-liquid phase material, regulating the stirring rotating speed to a measuring rotating speed, shooting after the stirring paddle works stably, and obtaining an image of the stirring kettle; clipping the image and obtaining RGB components; and carrying out binarization processing on the RGB component values, and calculating to obtain the solid-phase suspension height according to the data of the binarization processing result along with the height change. The invention solves the problems of large error, poor repeatability and the like of the measurement result caused by methods of visual observation and the like. The method can be used for measuring the suspension height of the deposited particles and the pull-down height of the light floating particles under different viscosity systems.
Description
Technical Field
The invention relates to a measuring device for solid-phase suspension height, in particular to a measuring device and a measuring method for solid-phase suspension height in a multiphase transparent stirring kettle.
Background
Stirring operation is widely applied to a plurality of chemical processes such as sewage treatment, papermaking, metallurgy and the like, and solid-liquid multiphase media are usually present in the processes. At a specific stirring speed, a boundary layer is formed between the solid phase enrichment area and the supernatant, and the distance from the bottom of the kettle to the boundary layer is called the solid phase suspension height. In the stirring and mixing process, the solid phase concentration in the solid phase enrichment area is basically consistent, but at the solid-liquid phase boundary layer, the solid phase concentration is rapidly reduced, so that the liquid phase mixing performance and the mass transfer rate are obviously affected. In addition, when the solid phase suspension height reaches about 90% of the liquid level, the stirring kettle is in a complete off-bottom suspension state, and the complete off-bottom suspension state has important significance for the multiphase stirring process. Therefore, the change of the solid phase suspension height along with the rotation speed has important research and industrial values.
For the measurement method of the solid-phase suspension height, the naked eye observation method is generally adopted at present, but because the flow in the stirring kettle is very complex, the quasi-periodic three-dimensional unsteady turbulence characteristic is presented, the solid-phase suspension height is in a fluctuation state, the measurement results at different positions have larger difference, and the problems of large measurement result error, poor repeatability and the like are caused.
Disclosure of Invention
The invention aims to provide a measuring device and a measuring method for the solid-phase suspension height in a multiphase transparent stirring kettle, which can be suitable for measuring the suspension height of deposited particles and the pull-down height of light floating particles under different viscosity systems.
The technical scheme adopted by the invention is as follows:
1. measuring device for solid phase suspension height in multiphase transparent stirring kettle
The invention comprises a rotation speed measuring instrument, a motor, a transparent stirring kettle, a distance reference object, a computer and a digital camera; the digital camera is placed in front of the transparent stirring kettle, the transparent stirring kettle is internally provided with solid-liquid phase materials, a distance reference object is stuck outside the transparent stirring kettle at the height of the liquid level, the stirring paddle at one end of the motor stretches into the solid-liquid phase materials of the transparent stirring kettle, and the other end of the motor is connected with the computer through the rotating speed measuring instrument.
The color of the distance reference object is obviously different from that of the solid-liquid phase material.
The color of the solid-phase material in the solid-liquid phase material is obviously different from that of the liquid-phase material.
2. The method for measuring the solid phase suspension height in the multiphase transparent stirring kettle comprises the following steps:
Step 1) adding solid-liquid phase materials into a transparent stirring kettle, placing a digital camera in front of the transparent stirring kettle, adjusting the setting of the digital camera and the placing distance of the digital camera, so that the digital camera can clearly shoot the transparent stirring kettle, and connecting a motor with a computer through a rotating speed measuring instrument;
step 2) sticking a distance reference object outside the transparent stirring kettle with the height of the liquid level, regulating the stirring rotating speed to the measuring rotating speed, and starting a digital camera to shoot after the stirring paddle works stably to obtain an image of the transparent stirring kettle;
Step 3) clipping the image and obtaining red, green or blue components of the clipped image;
And 4) carrying out binarization processing on red, green or blue component values of the cut image, and calculating to obtain the solid-phase suspension height according to data of the binarization processing result changing along with the height.
The step 3) of cropping the image and obtaining the red, green or blue component of the cropped image comprises the following steps:
Step 3-1), cutting the image, and reserving a distance reference object and a solid-liquid phase region;
Step 3-2) acquires a pixel matrix of the red, green or blue component of the cropped image.
In the step 4), binarizing the red, green or blue component values of the cut image, and calculating to obtain a solid-phase suspension height according to the data of the binarization processing result along with the height change, wherein the method comprises the following steps:
step 4-1) selecting any column of pixels as a research object, and acquiring red, green or blue component values and corresponding pixel matrix row values of all pixels in the column;
step 4-2) calculating detection threshold values of red, green or blue component values of all pixels in the column, performing binarization processing on the detection threshold values, and drawing a curve with the line number value of the pixels in the column as an abscissa and the numerical value after the binarization processing as an ordinate;
Step 4-3) judging a distance reference object area, a supernatant area and a solid phase enrichment area according to the mutation of red, green or blue component values of pixels in the curve;
Respectively acquiring the line number value ranges of the pixels corresponding to the distance reference object and the supernatant liquid area, and calculating the line number occupied by the pixels in the corresponding area;
Step 4-4) calculating the solid phase suspension height Hc using the following formula,
Hc=H-Rcl/Rre*Hre
Wherein: h is the height of the liquid level in the transparent stirring kettle, rcl is the number of lines occupied by pixels in the supernatant area, rre is the number of lines occupied by pixels in the reference object area, hre is the height value from the reference object, and the units of Hc, H and Hre are required to be kept consistent;
Repeating the steps 4-1) to 4-4), obtaining solid phase suspension heights at different column positions, and taking the average value as the solid phase suspension height in the final transparent stirring kettle.
The invention has the beneficial effects that:
The invention provides a reliable measuring method for the solid-phase suspension height of the multiphase transparent stirring kettle for industrial production and experimental research, and solves the problems of large measuring result error, poor repeatability and the like caused by the existing methods of visual observation and the like. The device has good adaptability, and can be suitable for measuring the suspension height of deposited particles and the pull-down height of light floating particles under different viscosity systems; the invention has better practical value.
Drawings
FIG. 1 is a schematic diagram of the structure of the measuring device of the present invention.
FIG. 2 is a schematic representation of the curves obtained in the examples of the present invention.
In the figure: 1.2 parts of a rotating speed measuring instrument, 2 parts of a motor, 3 parts of a transparent stirring kettle, 4 parts of a distance reference object, 5 parts of a computer, 6 parts of a digital camera.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1, the invention comprises a rotation speed measuring instrument 1, a motor 2, a transparent stirring kettle 3, a distance reference object 4, a computer 5 and a digital camera 6; the digital camera 6 is placed in front of the transparent stirring kettle 3, solid-liquid phase materials are filled in the transparent stirring kettle 3, a distance reference object 4 is stuck outside the transparent stirring kettle 3 at the height of the liquid level, a stirring paddle at one end of the motor 2 stretches into the solid-liquid phase materials of the transparent stirring kettle 3, and the other end of the motor 2 is connected with the computer 5 through the rotating speed measuring instrument 1.
The color of the distance reference object 4 is obviously different from that of the solid-liquid phase material.
The color of the solid-phase material in the solid-liquid phase material is obviously different from that of the liquid-phase material.
Embodiments of the invention:
the working conditions adopted in this embodiment are as follows: the total mass of the liquid phase is 37.5kg, the total volume is 37.5L, the total mass of the solid phase is 4kg, the total volume is 1.6L, and the liquid level in the stirring kettle is 380mm.
Adding solid-liquid phase materials into the transparent stirring kettle 3, and sticking a distance reference object 4 outside the transparent stirring kettle 3 with the height of the liquid level after the liquid level is stable. In this example, the solid and liquid phases were quartz sand and water, respectively, and a red tape having a height of 10mm was attached as the distance reference object 4.
And adjusting the stirring rotation speed to the measurement rotation speed, and opening the digital camera 6 to shoot after the stirring paddle works stably to obtain an image of the transparent stirring kettle 3.
And cutting the image, and reserving the region where the distance reference object and the solid-liquid phase are located.
A matrix of pixels of the red, green or blue (RGB) component of the cropped image is acquired.
Selecting any column of pixels as a research object, and acquiring red, green or blue (RGB) component values and corresponding pixel matrix row values of all pixels in the column. In this embodiment, a matrix of pixels 588×625 is clipped to select the 520 th column of pixels as the study object.
Calculating the detection threshold value of the red, green or blue (RGB) component values of all pixels in the column, performing binarization processing on the detection threshold value, and drawing a curve with the line number value of the pixels in the column as an abscissa and the numerical value after the binarization processing as an ordinate. In this embodiment, the R (red) value is used for analysis, the maximum inter-class variance method is used to calculate the detection threshold value of the pixel in the column, the value is 107, the R (red) value is 255 which is greater than 107 and 0 which is less than or equal to 107, and the R (red) values of all pixels in the column vary with the pixel matrix row value before and after the binarization processing, as shown in fig. 2.
And judging the distance reference object area, the supernatant area and the solid-phase enrichment area according to the mutation of red, green or blue (RGB) component values of the pixels in the binarization curve. In this embodiment, the number of rows occupied by the pixels in the edge region of the 1-24 row image, the number of rows occupied by the pixels in the 25-51 row distance reference region, the number of rows occupied by the pixels in the 52-245 row supernatant region, the number of rows occupied by the pixels in the 245-588 row solid phase enrichment region, and the number of rows occupied by the pixels in the distance reference region and the supernatant region are 27 and 194, respectively.
Calculating a solid phase suspension height Hc using a formula hc=h-Rcl/Rre Hre, wherein: h is the height of the liquid level in the stirring kettle, rcl is the number of lines occupied by pixels in the supernatant area, rre is the number of lines occupied by pixels in the area away from the reference object, and Hre is the height value away from the reference object. In this example, H was 380mm, rcl was 194, rre was 27, hre was 10mm, and the solid phase suspension height Hc at this position was calculated to be 308mm.
Repeating the steps to obtain solid phase suspension heights at different positions, and taking the average value as the solid phase suspension height in the final stirring kettle. In this example, a total of 10 positions of solid phase suspension heights were obtained, respectively: 293mm, 305mm, 306mm, 309mm, 242mm, 284mm, 294mm, 298mm, 308mm, 296mm, and 294mm as the final solid phase suspension height in the stirred tank.
The demonstration process of the above steps is as follows:
In the RGB color mode, each color can be obtained by a change in three color components of red (R), green (G), and blue (B) and a superposition thereof with each other. Because of the abrupt change of color among the distance reference object, the supernatant liquid area and the solid phase enrichment area, the distance reference object, the supernatant liquid area and the solid phase enrichment area in the photographed image can be judged by acquiring a pixel matrix of red, green or blue (RGB) components of the research area and according to the abrupt change of the red, green or blue (RGB) component values of the pixels along with the height, namely the line number value of the pixel matrix. Given a distance of Hre from the reference, the number of rows occupied by pixels in this region is rce, the number of rows occupied by pixels in the supernatant region is Rcl, and the height of the supernatant region is Rcl/rce Hre. Considering the diversity of the bottom shape of the stirred tank, the liquid level is a horizontal plane, so the solid phase suspension height is obtained by subtracting the supernatant area height from the liquid level, and the solid phase suspension height Hc is H-Rcl/Rre Hre.
In addition, the method measures the suspension height of the solid phase based on data of the change of red, green or blue (RGB) component values at different heights, regardless of the viscosity of the liquid phase, the shape and density of the solid phase, and the like. Therefore, the method can be suitable for measuring the suspension height of the deposited particles and the pull-down height of the light floating particles under different viscosity systems.
The foregoing detailed description is provided to illustrate the present invention and not to limit the invention, and any modifications and changes made to the present invention within the spirit of the present invention and the scope of the appended claims fall within the scope of the present invention.
Claims (2)
1. The measuring method of the measuring device for the solid phase suspension height in the multiphase transparent stirring kettle is characterized by comprising the following steps of:
Step 1) adding solid-liquid phase materials into a transparent stirring kettle, placing a digital camera in front of the transparent stirring kettle, adjusting the setting of the digital camera and the placing distance of the digital camera, so that the digital camera can clearly shoot the transparent stirring kettle, and connecting a motor with a computer through a rotating speed measuring instrument;
step 2) sticking a distance reference object outside the transparent stirring kettle with the height of the liquid level, regulating the stirring rotating speed to the measuring rotating speed, and starting a digital camera to shoot after the stirring paddle works stably to obtain an image of the transparent stirring kettle;
Step 3) clipping the image and obtaining red, green or blue components of the clipped image;
step 4) carrying out binarization processing on red, green or blue component values of the cut image, and calculating to obtain a solid-phase suspension height according to data of the binarization processing result changing along with the height;
In the step 4), binarizing the red, green or blue component values of the cut image, and calculating to obtain a solid-phase suspension height according to the data of the binarization processing result along with the height change, wherein the method comprises the following steps:
Step 1) selecting any column of pixels as a research object, and acquiring red, green or blue component values and corresponding pixel matrix row values of all pixels in the column;
Step 2) calculating detection threshold values of red, green or blue component values of all pixels in the column, performing binarization processing on the detection threshold values, and drawing a curve with the line number value of the pixels in the column as an abscissa and the numerical value after the binarization processing as an ordinate;
Step 3) judging a distance reference object area, a supernatant area and a solid phase enrichment area according to the mutation of red, green or blue component values of pixels in the curve;
Respectively acquiring the line number value ranges of the pixels corresponding to the distance reference object and the supernatant liquid area, and calculating the line number occupied by the pixels in the corresponding area;
step 4) calculating the solid phase suspension height Hc by using the following formula,
Hc＝H-Rcl/Rre*Hre
Wherein: h is the height of the liquid level in the transparent stirring kettle, rcl is the number of lines occupied by pixels in the supernatant area, rre is the number of lines occupied by pixels in the reference object area, hre is the height value from the reference object, and the units of Hc, H and Hre are required to be kept consistent; repeating the steps to obtain solid phase suspension heights at different column positions, and taking the average value as the solid phase suspension height in the final transparent stirring kettle.
2. The method for measuring the solid phase suspension height of the multiphase transparent stirring kettle according to claim 1, wherein the method comprises the following steps: the step 3) of cropping the image and obtaining the red, green or blue component of the cropped image comprises the following steps:
Step 1), cutting an image, and reserving a distance reference object and a solid-liquid phase region;
step 2) a pixel matrix of the red, green or blue component of the cropped image is obtained.
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