CN116878612B - Multiphase interface liquid level measurement method and system - Google Patents
Multiphase interface liquid level measurement method and system Download PDFInfo
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- G—PHYSICS
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
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Abstract
The invention provides a multiphase interface liquid level measurement method and a multiphase interface liquid level measurement system, wherein the multiphase interface liquid level measurement method comprises the following steps: vertically and equally-spaced arranging n groups of electrode pairs to form a linear array sensor, wherein each group of electrode pairs comprises two adjacent electrodes; inserting the linear array sensor into the flotation cell in a vertical direction; in the adjacent excitation measurement mode, excitation voltage is applied to the first electrode pair, the respective voltage differences of other electrode pairs except the first electrode pair are sequentially measured, and the voltage differences of two adjacent electrode pairs in all the measured voltage differences are compared; determining the electrode pair where the maximum value or the minimum value in all the ratios is located as a target electrode pair where the medium interface is located; according to a first distance from a medium interface to the lower boundary of a target electrode pair and a first ratio of a voltage difference of the target electrode pair to a voltage difference of an adjacent electrode pair adjacent to the target electrode pair, establishing a change relation between the first distance and the first ratio by using simulation measurement; and determining the liquid level according to the change relation.
Description
Technical Field
The invention relates to the technical field of multiphase interface liquid level measurement, in particular to a multiphase interface liquid level measurement method and system.
Background
In the mineral flotation process, on-line monitoring of the froth interface plays a key role in ensuring the efficiency and quality of high value mineral recovery. Common liquid level measurement methods include mechanical transmission type, ultrasonic type, capacitance type, gamma ray method, optical method, resistance type, and the like.
Wherein the mechanical structure is easily blocked by the medium, and the measurement result is limited by the medium and is only suitable for single interface liquid level measurement; the ultrasonic method can utilize the wave reflection principle, avoids direct contact with a medium, is easily influenced by environmental factors, has low measurement accuracy in a multiphase medium and needs repeated calibration; the capacitive sensor can only reflect different proportions of two media, and the dielectric constant also changes along with the external environment such as temperature, humidity and the like, so that the capacitive liquid level measurement precision is low, and repeated calibration is needed; the main disadvantages of the gamma ray method are the high cost and the risk of radiation; the optical method has high precision but high price, has high requirements on the transparency and maintenance of the measured object, and increases the operation cost.
At present, the liquid level measurement method is mostly suitable for single-phase liquid level measurement, and although most methods can be applied to detection of a multi-phase interface, the requirements on the environment and the measured medium are relatively high, and the measurement result accuracy is relatively low.
Disclosure of Invention
In order to solve at least one technical problem in the prior art and in other aspects, the embodiment of the invention provides a multiphase interface liquid level measuring method and a multiphase interface liquid level measuring system, which can accurately position medium interfaces of different conductivity mediums and solve the problem that measured voltage data exceeds the measuring range of an instrument.
The embodiment of the invention provides a multiphase interface liquid level measurement method, which comprises the following steps: vertically and equally-spaced-apart n groups of electrode pairs to form a linear array sensor, wherein each group of electrode pairs comprises two adjacent electrodes, and n is an integer greater than 2; inserting the linear array sensor into a flotation cell along the vertical direction; in the adjacent excitation measurement mode, excitation voltage is applied to the first electrode pair, the respective voltage differences of other electrode pairs except the first electrode pair are sequentially measured, and the voltage differences of two adjacent electrode pairs in all the measured voltage differences are compared; determining the electrode pair where the maximum value or the minimum value in all the ratios is located as a target electrode pair where the medium interface is located; establishing a change relation between the first distance and the first ratio by using simulation measurement according to a first distance from the medium interface to the lower boundary of the target electrode pair and a first ratio of a voltage difference of the target electrode pair to a voltage difference of an adjacent electrode pair adjacent to the target electrode pair; determining the liquid level height according to the change relation; wherein the first ratio is the maximum value or the minimum value of all the ratios.
Optionally, the first electrode pair includes one or more electrode pairs, wherein the relative distances between the electrode pairs measuring the voltage difference and the electrode pairs applying the excitation voltage are the same.
Optionally, the voltage difference of the target electrode pair and the voltage difference of an adjacent electrode pair adjacent to the target electrode pair are related to the width of the electrodes, the spacing between the electrodes, the conductivity of the medium, and the volume of the flotation cell.
Optionally, the first ratio is proportional to a second ratio of the conductivities of the adjacent two-phase media.
Optionally, the establishing a change relationship between the first distance and the first ratio by using simulation measurement according to a first distance from the medium interface to a lower boundary of the target electrode pair and a first ratio of a voltage difference of the target electrode pair to a voltage difference of an adjacent electrode pair adjacent to the target electrode pair includes: and establishing a change relation between the first distance and the first ratio by using simulation measurement and calculation through adjusting the height of the medium interface.
Optionally, the determining the liquid level height according to the change relation includes: determining the distance from the medium interface to the lower boundary of the second electrode pair by a linear fitting method according to the change relation and the ratio of the voltage difference of the second electrode pair where the medium interface is positioned and the voltage difference of the adjacent electrode pair adjacent to the second electrode pair; the liquid level is obtained based on the distance from the medium interface to the lower boundary of the second electrode pair and the position of the second electrode pair.
Another embodiment of the present invention provides a multiphase interface level measurement system comprising: the array sensor is arranged in the flotation cell along the vertical direction; an analog switch configured to be connected to the array sensor and to apply an excitation voltage to an electrode pair on the array sensor; a control unit configured to be connected to the analog switch and to control the analog switch; an analysis measurement unit configured to be connected to the analog switch, and to obtain respective voltage differences of adjacent electrode pairs transmitted by the analog switch and calculate a liquid level height; and the output unit is configured to be connected with the analysis and measurement unit and used for outputting the liquid level height.
Optionally, the array sensor is formed by vertically and equally arranging a plurality of annular electrodes.
Optionally, the analog switch is formed by an analog electronic switch chip or a relay.
Optionally, the analysis and measurement unit calculates the liquid level height according to a first distance between the medium interface and the lower boundary of the target electrode pair, and a change relation between a first ratio of a voltage difference of the target electrode pair and a voltage difference of an adjacent electrode pair adjacent to the target electrode pair, wherein the first distance is established through simulation measurement, and the voltage difference of each adjacent electrode pair is transmitted by the simulation switch.
According to the multiphase interface liquid level measuring method and system, n groups of electrode pairs are vertically arranged at equal intervals to form the linear array sensor, the linear array sensor is inserted into a flotation cell along the vertical direction, exciting voltages are applied to the first electrode pairs in an adjacent exciting measurement mode, the respective voltage differences of other electrode pairs except the first electrode pairs are sequentially measured, the voltage differences of two adjacent electrode pairs in all the measured voltage differences are compared, the electrode pair where the maximum value or the minimum value in all the ratios is located is determined to be the target electrode pair where the medium interface is located, according to the first distance from the medium interface to the lower boundary of the target electrode pair and the first ratio of the voltage difference between the target electrode pair and the voltage difference between the adjacent electrode pair, the liquid level height is determined according to the change relation by utilizing simulation to establish the change relation between the first distance and the first ratio, the medium with different conductivity mediums can be accurately positioned, and meanwhile, the problem that measured voltage data exceeds the measuring range of an instrument is solved.
Drawings
FIG. 1 is a flow chart of a multiphase interface level measurement method according to one embodiment of the invention;
FIG. 2 is a schematic diagram of a multiphase interface level measurement method according to one embodiment of the invention;
FIG. 3 is a graph of the variation of the voltage difference measured for each of the other electrode pairs for a first electrode pair as a set of electrode pairs according to one embodiment of the invention;
FIG. 4 is a graph of the variation of the voltage difference of each of the other electrode pairs measured for a first electrode pair for a plurality of electrode pairs according to one embodiment of the invention;
FIG. 5 is a block diagram of a multiphase interface level measurement system in accordance with one embodiment of the present invention;
FIG. 6 is a diagram of the operation of the array sensor and the flotation cell of the multiphase interface level measurement system according to one embodiment of the present invention.
In the drawings, the reference numerals have the following meanings:
1. an array sensor;
2. a control unit;
3. an analog switch;
4. an analysis measurement unit;
5. an output unit;
6. a flotation cell;
7. an electrode;
8. and (5) supporting the column.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Where expressions like at least one of "A, B and C, etc. are used, the expressions should generally be interpreted in accordance with the meaning as commonly understood by those skilled in the art (e.g.," a system having at least one of A, B and C "shall include, but not be limited to, a system having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a formulation similar to at least one of "A, B or C, etc." is used, in general such a formulation should be interpreted in accordance with the ordinary understanding of one skilled in the art (e.g. "a system with at least one of A, B or C" would include but not be limited to systems with a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
According to the invention, in order to solve the problems that when exciting the electrodes by applying exciting current, exciting current is constant, but impedance of a measuring medium is uncertain, and measured voltage data exceeds the measuring range of an instrument, the invention adopts the steps that exciting voltage exciting electrode pairs are applied, exciting voltage is constant, and conductivities of the measuring mediums are different, so that output currents on the electrode pairs for measuring voltage differences are different, the output currents are converted into voltage forms through an I-V conversion circuit, and the voltage differences of the electrode pairs are measured, so that the problem that the measured voltage data exceeds the measuring range of the instrument is solved.
FIG. 1 is a flow chart of a multiphase interface level measurement method according to one embodiment of the invention.
According to an embodiment of the present invention, as shown in FIG. 1, a multiphase interface level measurement method includes the following steps S1-S6.
Step S1: and vertically and equally-spaced n groups of electrode pairs to form the linear array sensor, wherein each group of electrode pairs comprises two adjacent electrodes, and n is an integer greater than 2.
Step S2: the linear array sensor is inserted into the flotation cell in a vertical direction.
Step S3: in the adjacent excitation measurement mode, excitation voltage is applied to the first electrode pair, respective voltage differences of other electrode pairs except the first electrode pair are sequentially measured, and the voltage differences of two adjacent electrode pairs in all the measured voltage differences are compared.
Step S4: and determining the electrode pair where the maximum value or the minimum value in all the ratios is located as the target electrode pair where the medium interface is located.
Step S5: and according to the first distance from the medium interface to the lower boundary of the target electrode pair and the first ratio of the voltage difference of the target electrode pair to the voltage difference of the adjacent electrode pair adjacent to the target electrode pair, establishing a change relation between the first distance and the first ratio by using simulation measurement.
Step S6: and determining the liquid level according to the change relation.
According to the embodiment of the invention, floating ore dressing is mainly carried out in the flotation tank in the step S2, wherein the floating ore dressing refers to froth flotation, and the process of mineral separation is realized from ore pulp by means of the buoyancy of bubbles according to the difference of the physical and chemical properties of the surfaces of mineral particles.
According to an embodiment of the invention, the adjacent excitation measurement pattern in step S3 may be E directed to the first electrode pair k-1 Electrode and E k Applying excitation voltage to the electrodes, measuring E of other electrode pairs in response to the first electrode pair i Electrode and E i+1 Between the electrodes E i+1 Electrode and E i+2 Between the electrodes E i+2 Electrode and E i+3 A voltage difference … between the electrodes.
According to an embodiment of the present invention, in step S4, the medium interface may be an interface of two media having different conductivities.
According to embodiments of the invention, there may be interfaces of multiple media in the flotation cell.
According to the multiphase interface liquid level measuring method provided by the embodiment of the invention, the medium interfaces of different conductivity mediums can be accurately positioned, and the problem that measured voltage data exceeds the measuring range of an instrument is solved.
According to an embodiment of the invention, the first electrode pairs comprise one or more sets of electrode pairs, wherein the relative distances of the sets of electrode pairs measuring the voltage difference and the electrode pairs applying the excitation voltage are the same.
FIG. 2 is a schematic diagram of a multiphase interface level measurement method according to one embodiment of the invention.
According to an embodiment of the present invention, as shown in fig. 2, the first electrode pair is a set of electrode pairs, and the first electrode pair (E k-1 ，E k ) By applying an excitation voltage, the other electrode pairs respond, and the measurement is performed sequentially (E i-1 ，E i ) Electrode pair, (E) i ，E i+1 ) Electrode pair, (E) i+1 ，E i+2 ) Electrode pair, (E) i+2 ，E i+3 ) The voltage differences of the electrode pairs … are respectively compared with the voltage differences of two adjacent electrode pairs in all the measured voltage differences, and can be expressed as And determining the electrode pair where the maximum value or the minimum value in all the ratios is located as the target electrode pair where the medium interface is located. Δx is expressed as a first distance from the medium interface to the lower boundary of the target electrode pair, d is expressed as the spacing between the electrodes, h is expressed as the liquid level height, σ f Sum sigma p Respectively as the conductivity of the adjacent two-phase medium. If the target electrode pair at the medium interface is (E i ，E i+1 ) The first ratio of the voltage difference of the electrode pair, the target electrode pair, and the voltage difference of the adjacent electrode pair adjacent to the target electrode pair can be expressed by formula (1):
wherein, gamma i Expressed as a first ratio, U (k-1，k，i，i+1) Represented as a direction (E k-1 ，E k ) Electrode pair applicationVoltage difference of target electrode pair when exciting voltage, U (k-1，k，i-1，i) Represented as a direction (E k-1 ，E k ) A voltage difference between adjacent electrode pairs adjacent to the target electrode pair when the excitation voltage is applied to the electrode pair.
FIG. 3 is a graph of the variation of the voltage difference measured by a first electrode pair for a set of electrode pairs for each of the other electrode pairs in accordance with one embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 3, a direction (E 1 ，E 2 ) Applying an excitation voltage to the electrode pair, (E) 2 ，E 3 ) The voltage difference of the electrode pair is V 1 ，(E 3 ，E 4 ) The voltage difference of the electrode pair is V 2 ，(E 4 ，E 5 ) The voltage difference of the electrode pair is V 3 ，(E 5 ，E 6 ) The voltage difference of the electrode pair is V 4 ，(E 6 ，E 7 ) The voltage difference of the electrode pair is V 5 ，(E 7 ，E 8 ) The voltage difference of the electrode pair is V 6 ，(E 8 ，E 9 ) The voltage difference of the electrode pair is V 7 ，(E 9 ，E 10 ) The voltage difference of the electrode pair is V 8 … the voltage difference between two adjacent electrode pairs among all the measured voltage differences can be expressed asAs shown in FIG. 3, the minimum value is +.>The target electrode pair at which the medium interface is located can be determined as (E 8 ，E 9 ) An electrode pair. The ratio of the voltages of adjacent pairs of electrodes among all the voltages can also be expressed as +.> Maximum value +.>The target electrode pair at which the medium interface is located can be determined as (E 8 ，E 9 ) An electrode pair.
According to an embodiment of the present invention, the first electrode pair is a plurality of electrode pairs, directed (E k-2 ，E k-1 ) The electrode pairs are energized, and the voltage is measured (E i ，E i+1 ) Voltage difference of electrode pair to (E k-1 ，E k ) The electrode pairs are energized, and the voltage is measured (E i+1 ，E i+2 ) The voltage difference … of the electrode pairs is obtained by comparing the voltage differences of two adjacent electrode pairs in all the measured voltage differences, and the electrode pair with the maximum value or the minimum value in all the ratio is determined as the target electrode pair with the medium interface. If the target electrode pair at the medium interface is (E i ，E i+1 ) The first ratio of the voltage difference of the electrode pair, the target electrode pair, and the voltage difference of the adjacent electrode pair adjacent to the target electrode pair can be expressed by formula (2):
wherein U is (k-2，k-1，i，i+1) Represented as a direction (E k-2 ，E k-1 ) Voltage difference of target electrode pair when exciting voltage is applied to electrode pair, U (k-1，k，i+1，i+2) Represented as a direction (E k-1 ，E k ) A voltage difference between adjacent electrode pairs adjacent to the target electrode pair when the excitation voltage is applied to the electrode pair.
FIG. 4 is a graph of the variation of the voltage difference of each of the other electrode pairs measured for a first electrode pair for a plurality of electrode pairs according to one embodiment of the invention.
According to an embodiment of the present invention, as shown in fig. 4, a direction (E 1 ，E 2 ) Applying an excitation voltage to the electrode pair, (E) 2 ，E 3 ) The voltage difference of the electrode pair is V 1 The method comprises the steps of carrying out a first treatment on the surface of the Direction (E) 2 ，E 3 ) Applying an excitation voltage to the electrode pair, (E) 3 ，E 4 ) The voltage difference of the electrode pair is V 2 The method comprises the steps of carrying out a first treatment on the surface of the Direction (E) 3 ，E 4 ) Electrode pair applicationExcitation voltage (E) 4 ，E 5 ) The voltage difference of the electrode pair is V 3 The method comprises the steps of carrying out a first treatment on the surface of the Direction (E) 4 ，E 5 ) Applying an excitation voltage to the electrode pair, (E) 5 ，E 6 ) The voltage difference of the electrode pair is V 4 The method comprises the steps of carrying out a first treatment on the surface of the Direction (E) 5 ，E 6 ) Applying an excitation voltage to the electrode pair, (E) 6 ，E 7 ) The voltage difference of the electrode pair is V 5 The method comprises the steps of carrying out a first treatment on the surface of the Direction (E) 6 ，E 7 ) Applying an excitation voltage to the electrode pair, (E) 7 ，E 8 ) The voltage difference of the electrode pair is V 6 The method comprises the steps of carrying out a first treatment on the surface of the Direction (E) 7 ，E 8 ) Applying an excitation voltage to the electrode pair, (E) 8 ，E 9 ) The voltage difference of the electrode pair is V 7 The method comprises the steps of carrying out a first treatment on the surface of the Direction (E) 8 ，E 9 ) Applying an excitation voltage to the electrode pair, (E) 9 ，E 10 ) The voltage difference of the electrode pair is V 8 … the voltage difference between two adjacent electrode pairs among all the measured voltage differences can be expressed as As shown in FIG. 4, the minimum value is +.>The target electrode pair at which the medium interface is located can be determined as (E 8 ，E 9 ) An electrode pair. The voltage difference between two adjacent electrode pairs in all the voltage differences can be expressed asMaximum value +.>The target electrode pair at which the medium interface is located can be determined as (E 8 ，E 9 ) An electrode pair.
According to the embodiment of the invention, the electrode pair for measuring the voltage difference and the electrode pair for applying the excitation voltage are separately arranged, so that the influence of contact impedance is eliminated.
According to an embodiment of the invention, the voltage difference of the target electrode pair and the voltage difference of the adjacent electrode pair adjacent to the target electrode pair are related to the width of the electrodes, the spacing between the electrodes, the conductivity of the medium and the volume of the flotation cell.
According to an embodiment of the invention, the respective voltage differences of the other electrode pairs are also related to the width of the electrodes, the spacing between the electrodes, the conductivity of the medium and the volume of the flotation cell.
According to an embodiment of the present invention, the interval between the electrodes is set to be greater than 2 times the width of the electrodes.
According to an embodiment of the invention, the first ratio is proportional to the second ratio of the conductivities of the adjacent two-phase media.
According to an embodiment of the present invention, if the target electrode pair at the medium interface is (E i ，E i+1 ) The electrode pair, the first ratio being proportional to the second ratio of the conductivities of the adjacent two-phase media, can be expressed by equation (3):
wherein sigma f Sum sigma p The conductivities of adjacent two-phase media are respectively shown.
According to an embodiment of the invention, the larger the conductivity difference between adjacent two-phase media, the larger the first ratio difference. In the target electrode pair (E i ，E i+1 ) With medium interface, gamma i >>1 or gamma i <<1。
According to the embodiment of the invention, the position of the medium interface is determined by using the measurement data of the first ratio according to the difference of the conductivity of the two-phase medium, so that the image reconstruction process is omitted, and the liquid level measurement speed is improved.
According to an embodiment of the present invention, establishing a change relationship between a first distance and a first ratio using simulation measurement based on a first distance from a medium interface to a lower boundary of a target electrode pair and a first ratio of a voltage difference of the target electrode pair and a voltage difference of an adjacent electrode pair adjacent to the target electrode pair includes: and establishing a change relation between the first distance and the first ratio by utilizing simulation measurement and calculation through adjusting the height of the medium interface.
According to the embodiment of the invention, the change relation between the first distance and the first ratio can be established by using simulation measurement or experiment.
According to an embodiment of the present invention, if the target electrode pair at the medium interface is (E i ，E i+1 ) The change relation between the electrode pair, the first distance and the first ratio can be expressed by the formula (4):
where Δx is denoted as the first distance.
According to an embodiment of the invention, determining the liquid level height from the change relation comprises: determining the distance from the medium interface to the lower boundary of the second electrode pair by a linear fitting method according to the change relation and the ratio of the voltage difference of the second electrode pair where the medium interface is positioned and the voltage difference of the adjacent electrode pair adjacent to the second electrode pair; the liquid level is obtained based on the distance from the medium interface to the lower boundary of the second electrode pair and the position of the second electrode pair.
According to the embodiment of the invention, when the liquid level height of the medium interface is actually measured, the distance from the medium interface to the lower boundary of the second electrode pair is determined by a linear fitting method according to the ratio of the voltage difference of the second electrode pair where the medium interface is positioned to the voltage difference of the adjacent electrode pair adjacent to the second electrode pair and the change relation between the first distance and the first ratio established by simulation measurement, and then the liquid level height is obtained according to the position of the second electrode pair.
According to an embodiment of the present invention, the interval between the electrodes is a certain value, and the liquid level height can be expressed by formula (5):
h＝(i-1)×d+Δx (5)。
where h is denoted as the liquid level height, d is denoted as the spacing between the electrodes, and Δx is denoted as the first distance.
FIG. 5 is a block diagram of a multiphase interface level measurement system in accordance with one embodiment of the present invention.
According to another embodiment of the present invention, as shown in fig. 5, a multiphase interface level measurement system comprises an array sensor 1, a control unit 2, an analog switch 3, an analytical measurement unit 4 and an output unit 5. The array sensor 1 is arranged in a vertical direction in a flotation cell 6. The analog switch 3 is configured to be connected to the array sensor 1 for applying an excitation voltage to the electrode pairs on the array sensor 1. The control unit 2 is configured to be connected to the analog switch 3 for controlling the analog switch 3. The analytical measurement unit 4 is configured to be connected to the analog switch 3 for acquiring the respective voltage differences of adjacent electrode pairs transmitted by the analog switch 3 and calculating the liquid level height. The output unit 5 is configured to be connected to the analytical measurement unit 4 for outputting the liquid level height.
According to the embodiment of the invention, the circuit of the multiphase interface liquid level measurement system is simple to realize and low in cost.
Fig. 6 is a diagram of the operation of the array sensor 1 and the flotation cell 6 of the multiphase interface level measurement system according to one embodiment of the invention.
According to an embodiment of the present invention, as shown in fig. 6, the array sensor 1 is composed of a plurality of ring-shaped electrodes 7 arranged vertically at equal intervals.
According to an embodiment of the present invention, a plurality of ring-shaped electrodes 7 are vertically arranged at equal intervals on the support columns 8 of the array sensor 1.
According to an embodiment of the invention, there are two media, froth and pulp, in the flotation cell 6, and the array sensor 1 is inserted in the vertical direction into the flotation cell 6 to start the measurement of the liquid level.
In accordance with an embodiment of the present invention, taking the array sensor 1 of FIG. 6 as an example, the bottom-up electrodes 7 are E respectively 1 、E 2 、E 3 、…、E 17 The medium interface is not lower than E 3 Not higher than E 15 。
According to an embodiment of the invention, the analog switch 3 is constituted by an analog electronic switch chip or relay.
According to an embodiment of the present invention, the analog switch 3 is configured to apply an excitation voltage to the electrode pairs on the array sensor 1, and transmit the respective voltage differences of the measured adjacent electrode pairs to the analysis measurement unit 4 after applying the excitation voltage.
According to an embodiment of the present invention, the analysis and measurement unit 4 calculates the liquid level height from the acquired respective voltage differences of the adjacent electrode pairs transmitted by the analog switch 3 by simulating and measuring the established first distance from the medium interface to the lower boundary of the target electrode pair and the change relationship between the voltage difference of the target electrode pair and the first ratio of the voltage difference of the adjacent electrode pair adjacent to the target electrode pair.
According to an embodiment of the present invention, the analysis measurement unit 4 measures, through simulation, the established first distance of the medium interface to the lower boundary of the target electrode pair and the change relationship between the voltage difference of the target electrode pair and the first ratio of the voltage difference of the adjacent electrode pair adjacent to the target electrode pair. According to the ratio of the voltage difference of the second electrode pair where the medium interface is located and the voltage difference of the adjacent electrode pair adjacent to the second electrode pair when the actual measurement is obtained and transmitted by the analog switch 3, the distance from the medium interface to the lower boundary of the second electrode pair is determined by a linear fitting method, and then the liquid level height is obtained according to the position of the second electrode pair.
According to the embodiment of the invention, the real-time performance of the multiphase interface liquid level measurement system ensures the accuracy of measuring the liquid level height and simultaneously effectively improves the efficiency of measuring the liquid level height.
The embodiments of the present invention are described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the invention, and such alternatives and modifications are intended to fall within the scope of the invention.
Claims (9)
1. A multiphase interface level measurement method, comprising:
vertically and equally-spaced arranging n groups of electrode pairs to form a linear array sensor, wherein each group of electrode pairs comprises two adjacent electrodes, and n is an integer greater than 2;
inserting the linear array sensor into a flotation cell in a vertical direction;
in the adjacent excitation measurement mode, excitation voltage is applied to the first electrode pair, the respective voltage differences of other electrode pairs except the first electrode pair are sequentially measured, and the voltage differences of two adjacent electrode pairs in all the measured voltage differences are compared;
determining the electrode pair where the maximum value or the minimum value in all the ratios is located as a target electrode pair where the medium interface is located;
establishing a change relation between the first distance and the first ratio by using simulation measurement according to a first distance from the medium interface to the lower boundary of the target electrode pair and a first ratio of a voltage difference of the target electrode pair to a voltage difference of an adjacent electrode pair adjacent to the target electrode pair;
determining the distance from the medium interface to the lower boundary of the second electrode pair by a linear fitting method according to the change relation and the ratio of the voltage difference of the second electrode pair where the medium interface is positioned and the voltage difference of the adjacent electrode pair adjacent to the second electrode pair;
obtaining the liquid level height according to the distance from the medium interface to the lower boundary of the second electrode pair and the position of the second electrode pair;
wherein the first ratio is the maximum value or the minimum value of all the ratios.
2. The multiphase interface level measurement method of claim 1, wherein the first electrode pair comprises one or more electrode pairs, wherein the relative distances of the electrode pairs measuring the voltage difference and the electrode pairs applying the excitation voltage are the same.
3. The multiphase interface level measurement method of claim 1 wherein the voltage difference of the target electrode pair and the voltage difference of adjacent electrode pairs adjacent to the target electrode pair are related to the width of the electrodes, the spacing between the electrodes, the conductivity of the medium, and the volume of the flotation cell.
4. The multiphase interface level measurement method of claim 1 wherein the first ratio is proportional to a second ratio of conductivities of adjacent two-phase media.
5. The multiphase interface level measurement method of claim 1 wherein the establishing a change relationship between the first distance and the first ratio using simulation measurements based on a first distance from the medium interface to a lower boundary of the target electrode pair and a first ratio of a voltage difference of the target electrode pair to a voltage difference of an adjacent electrode pair adjacent to the target electrode pair comprises:
and establishing a change relation between the first distance and the first ratio by utilizing simulation measurement and calculation through adjusting the height of the medium interface.
6. A multiphase interface level measurement system adapted to implement the method of any one of claims 1 to 5, comprising:
the array sensor is arranged in the flotation cell along the vertical direction;
an analog switch configured to be connected to the array sensor for applying an excitation voltage to an electrode pair on the array sensor;
a control unit configured to be connected to the analog switch for controlling the analog switch;
an analysis and measurement unit, configured to be connected with the analog switch, and used for acquiring respective voltage differences of adjacent electrode pairs transmitted by the analog switch and calculating to obtain a liquid level height;
and the output unit is configured to be connected with the analysis and measurement unit and used for outputting the liquid level height.
7. The multiphase interface level measurement system of claim 6 wherein the array sensor is comprised of a plurality of annular electrodes arranged vertically equally spaced.
8. The multiphase interface level measurement system of claim 6 wherein the analog switch is comprised of an analog electronic switch chip or relay.
9. The multiphase interface liquid level measurement system of claim 6, wherein the analytical measurement unit determines the distance from the medium interface to the lower boundary of the second electrode pair by a linear fitting method based on the ratio of the voltage difference of the second electrode pair, which is transmitted by the analog switch, to the voltage difference of the adjacent electrode pair, which is adjacent to the second electrode pair, based on the first distance from the medium interface to the lower boundary of the target electrode pair, and the change relation between the voltage difference of the target electrode pair and the first ratio of the voltage difference of the adjacent electrode pair, which is adjacent to the target electrode pair, established by the analog measurement, and based on the distance from the medium interface to the lower boundary of the second electrode pair and the position of the second electrode pair, thereby obtaining the liquid level height.
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