CN112858463B - Device for measuring concentration of solid medium in solid-liquid two-phase fluid - Google Patents
Device for measuring concentration of solid medium in solid-liquid two-phase fluid Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 100
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- 239000007787 solid Substances 0.000 title claims description 12
- 230000006698 induction Effects 0.000 claims abstract description 98
- 239000012071 phase Substances 0.000 claims abstract description 90
- 230000009467 reduction Effects 0.000 claims abstract description 47
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 42
- 239000007790 solid phase Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000006249 magnetic particle Substances 0.000 claims abstract description 8
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 8
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 230000005284 excitation Effects 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 5
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- 238000005259 measurement Methods 0.000 abstract description 15
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- 238000001514 detection method Methods 0.000 description 13
- 238000005520 cutting process Methods 0.000 description 11
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- 239000002910 solid waste Substances 0.000 description 2
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- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract
The application relates to a device for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid, which utilizes an electromagnetic induction method to generate a magnetic field, the measured solid-liquid two-phase fluid cuts a magnetic induction line to generate induced electromotive force, the concentration of the solid phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, the automatic real-time test can be realized, and the concentration and the real-time change of the concentration of the solid phase medium in the flowing dynamic process of the solid-liquid two-phase medium are monitored in real time. The air compressor is utilized to form bubbles to drive the rapid mixing of the solid phase medium and the liquid phase medium in the solid-liquid two phases, and the magnetic particles are aqueous magnetic fluid of ferrite, so that the dependence on temperature is small, the interference on a test result caused by temperature change is prevented, and the test accuracy is improved. The exciting coils of the induction coil group and the reduction coil group are all helmholtz magnetic coils, so that the uniformity of a generated magnetic field is improved, and the measurement accuracy is improved.
Description
Technical Field
The application relates to the field of fluid medium concentration test, in particular to a device for measuring the concentration of a solid medium in a solid-liquid two-phase fluid.
Background
In the fields of modern industry such as petroleum, chemical industry, nuclear power, ocean engineering and the like, a conveying pipeline is widely applied to conveying various fluid media, and solid-liquid two-phase fluid is the most common conveying medium in the industrial application. In the above industrial process, the detection of the concentration of the solid phase medium of the solid-liquid two-phase fluid is important for the characteristic research of the solid-liquid two-phase medium, the improvement of efficiency and yield in some production processes, and the monitoring of the whole production.
In the prior art, the detection mode of the concentration of the solid phase medium in the solid-liquid two-phase fluid generally adopts manual sampling detection, namely sampling is firstly carried out, a solid waste sample is collected into an open heat-resistant container, then weighing is carried out, the container is placed into a heating box for heating for a period of time, the liquid in the solid waste is completely volatilized, weighing is carried out again, and the concentration of the solid-liquid two phases can be calculated by calculating the mass difference before and after heating. The detection mode has simple principle and low cost, can perform rough detection under the condition of low requirement on the analysis data of the solid-phase medium components, and has wide application. The main disadvantage of the detection mode is that the degree of automation is not high, the principle is simple, the operation is complex, the labor cost is high, the detection mode is almost completely based on manual operation, and the efficiency is low; the method is not beneficial to monitoring the real-time change of the concentration of the solid-phase medium in the flowing dynamic process of the solid-liquid two-phase medium in real time; and when the concentration of the solid phase medium in the solid-liquid two-phase fluid is low, a large amount of sampling is needed to ensure the test precision, multiple samples are measured one by one, the workload is large, the data processing is complicated, the error accumulation is easy, and the measurement accuracy is difficult to ensure.
Disclosure of Invention
The application aims to provide a device for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid, so as to solve the technical problem in the background art, wherein the concentration of the solid phase medium is limited to be the volume percent of the solid phase medium to the solid-liquid two-phase medium, namely, vol percent.
The device is characterized in that a magnetic field is generated by using an electromagnetic induction method, a magnetic induction line is cut by the measured solid-liquid two-phase fluid, induced electromotive force is generated, the concentration of the solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, distilled water is utilized to dilute aqueous magnetic fluid to 0.1vol.% concentration, the diluted aqueous magnetic fluid with the concentration of 0.1vol.% is used as a liquid carrier of the measured solid-liquid two-phase fluid to be mixed with the measured solid-liquid two-phase fluid, and the solid phase magnetic particles in the aqueous magnetic fluid are ferrite.
The device comprises a first centrifugal pump, wherein a liquid outlet of the first centrifugal pump is connected with a first tee joint through a first stop valve; the air compressor is also provided with an air outlet which is connected with the mass flowmeter through a needle valve, and a compressed air conveying pipeline is connected with a medium conveying pipe of the first centrifugal pump; the magnetic solid-liquid two-phase fluid at the left end outlet of the first tee joint is mixed with the compressed air output by the mass flowmeter and flows along the vertical pipeline, an air separator is arranged at the tail end of the vertical pipeline, the solid-liquid two-phase fluid after air separation is continuously conveyed to the tested inclined pipeline, and finally the solid-liquid two-phase fluid passes through the second tee joint and returns to the inlet of the first centrifugal pump through the second stop valve; and the inclined pipeline is connected with the second tee joint, and the tail end of the other vertical pipeline is connected with the sampling volume box through a switch valve.
The device comprises a pipeline, a pipeline detection device and a pipeline detection device, wherein an induction coil group is sleeved outside the detected inclined pipeline, and a reduction coil group is connected in series with the induction coil group; the induction coil group and the reduction coil are provided with an induction coil and an excitation coil; the induction coils on one side of the induction coil group are respectively connected to the signal amplifier and the induction coils on one side of the reduction coil group, the induction coils on the other side of the induction coil group are also respectively connected to the signal amplifier and the induction coils on the other side of the reduction coil group, and the induction coils on two sides of the reduction coil group are respectively connected to the signal amplifier; the signal amplifier is connected with a high-pass filter, and the high-pass filter is connected with an analog-to-digital conversion computer; the exciting coil of the reduction coil set is connected with a bipolar power supply, the bipolar power supply is connected with a signal generator, and the induction coil on one side of the reduction coil set is connected with the exciting coil of the induction coil set.
All the pipelines of the device are transparent pipelines, so that the flow form of the fluid medium can be observed conveniently.
The sampling volume box accommodates solid-liquid two-phase fluid conveyed in industry, and the solid-liquid two-phase fluid conveyed in industry is a fluid medium to be tested.
And a parallel pipeline connected with a pipeline where the first centrifugal pump is positioned is further arranged between the first tee joint and the second tee joint, a third stop valve and a fourth stop valve are arranged on two sides of the parallel pipeline, and a second centrifugal pump is arranged between the third stop valve and the fourth stop valve.
The second centrifugal pump is connected with the clear water tank and driven by a motor.
The inclined angle of the inclined pipeline is 30 degrees.
The pressure gauge and the two ends of the inclined pipeline to be measured are connected with a pressure data recorder in the middle of the two pressure gauges.
And exciting coils of the induction coil group and the reduction coil group are helmholtz magnetic coils.
An analog-to-digital converter in the analog-to-digital conversion computer converts the instantaneous induced electromotive force into a digital signal, the sampling frequency is 1000hz, the sampling number is 5000, the specification of the analog-to-digital converter is that the voltage input range is plus or minus 10V, and the resolution is 16 bits.
The theoretical basis of the measurement is that the induced electromotive force V generated by cutting the magnetic induction line by the fluid medium in the inclined pipeline, the magnetic field intensity H of the inclined pipeline, the number n of turns of the induction coil and the relative magnetization M of the fluid medium in the inclined pipeline mf Has the following relationship:
wherein mu 0 For the permeability of the fluid medium in the inclined pipe, t is the time of sampling the test data, and S is the cross-sectional area of the inclined pipe perpendicular to the direction of the magnetic induction line.
The device for measuring the concentration of the solid phase medium in the solid-liquid two-phase fluid comprises the following steps:
step 1, preparing aqueous magnetic fluid, namely diluting the aqueous magnetic fluid to a concentration of 0.1vol.% by using distilled water, taking the diluted aqueous magnetic fluid with the concentration of 0.1vol.% as a liquid phase carrier of a solid-liquid two-phase fluid to be tested, and mixing the aqueous magnetic fluid with the solid-liquid two-phase fluid to be tested, wherein the solid phase magnetic particles in the aqueous magnetic fluid are ferrite;
step 2, a first stop valve and a second stop valve are opened, a third stop valve and a fourth stop valve are closed, a first centrifugal pump is started to enable medium in a pipeline to circularly flow, only water-based magnetic fluid with the concentration of 0.1vol.% is circularly conveyed in the pipeline by the aid of the first centrifugal pump, an air compressor is started, a needle valve is opened, pressurized gas is conveyed into the pipeline to drive the water-based magnetic fluid to be uniformly mixed, an air separator is started to separate out gas, a bipolar power supply is activated to convey current to an exciting coil of a reduction coil set through a signal generator, the reduction coil set is connected with an induction coil set in series, so that the induction coil set induces a magnetic field, induction coils on one side of the induction coil set are respectively connected to an induction coil on one side of the signal amplifier and the reduction coil set, induction coils on the other side of the induction coil set are respectively connected to induction coils on the other side of the signal amplifier and the reduction coil set, and induction coils on two sides of the reduction coil set are respectively connected to the signal amplifier; the signal amplifier is connected with a high-pass filter, and the high-pass filter is connected with an analog-to-digital conversion computer; an induction coil at one side of the reduction coil set is connected to an excitation coil of the induction coil set, and an analog-to-digital conversion computer is used for reading a water-based magnetic fluid cutting induction line in the inclined pipeline to generate induced electromotive force V (q=0);
step 3, discharging a preset volume of aqueous magnetic fluid in a measuring device, opening a switching valve of a sampling volume box to mix the preset volume of sampled solid-liquid two-phase fluid with 0.1vol.% of aqueous magnetic fluid, closing the switching valve of the sampling volume box, continuously utilizing an air compressor to convey pressure gas into a pipeline to drive the aqueous magnetic fluid to be uniformly mixed with the sampled measured solid-liquid two-phase fluid, opening an air separator to separate out gas, continuously activating a bipolar power supply through a signal generator to convey current to an exciting coil of a reduction coil set, and reading a fluid medium cutting induction line after the aqueous magnetic fluid in an inclined pipeline is mixed with the sampled measured solid-liquid two-phase fluid through an analog-digital conversion computer to generate induced electromotive force V (q) exp )；
Step 4, discharging all mixed fluid media in the pipeline, closing an air separator, closing a first stop valve, a second stop valve and a first centrifugal pump, closing a signal generator and a bipolar power supply, opening a third stop valve and a fourth stop valve, starting a second centrifugal pump to suck clean water, cleaning the pipeline, and then conveying dry pressure gas into the pipeline by using an air compressor to dry the pipeline;
step 5, closing a third stop valve, a fourth stop valve and a second centrifugal pump, opening a first stop valve and a second stop valve, starting the first centrifugal pump, opening a switch of a sampling volume box to fill a pipeline with sampled solid-liquid two-phase fluid, circularly driving the sampled solid-liquid two-phase fluid to be tested in the pipeline by the first centrifugal pump, continuously using an air compressor to convey pressure gas into the pipeline to drive the sampled solid-liquid two-phase fluid to be uniformly mixed, opening an air separator, separating out gas, activating a bipolar power supply to convey current to an exciting coil of a reduction coil set by a signal generator, and reading a sampled solid-liquid two-phase fluid to be tested in an inclined pipeline by an analog-to-digital conversion computer to cut a magnetic induction line to generate an induction electromotive force V (q=1);
step 6, correcting and calculating the concentration q of the solid phase medium in the measured solid-liquid two-phase fluid:
and DeltaV (cal.) ＝V rms(q＝0) -V rms(q＝1) Wherein V is rms(q＝0) When the water-based magnetic fluid is only in the inclined pipeline in the step 2, the root mean square value of a plurality of groups of induced electromotive force V (q=0) values generated by the cutting magnetic induction line is obtained; wherein V is rms(exp) When the water-based magnetic fluid in the inclined pipeline in the step 3 is mixed with the sampled measured solid-liquid two-phase fluid, a plurality of groups of induced electromotive forces V (q) exp ) Root mean square value of the value; wherein V is rms(q＝1) When the sample is only the solid-liquid two-phase fluid to be measured in the inclined pipeline in the step 5, the root mean square value of the values of a plurality of groups of induced electromotive forces V (q=1) generated by the cutting magnetic induction lines is obtained.
The technical scheme provided by the application has the following technical effects:
1. the air compressor is utilized to form bubbles to drive the rapid mixing of the solid phase medium and the liquid phase medium in the solid-liquid two phases, so as to simulate the flowing form of the solid-liquid two-phase medium in the actual industrial production process.
2. And the measurement result is calibrated, so that a final measurement result is obtained, the accuracy is high, and the accurate measurement of the solid-phase medium with the concentration lower than 0.80vol.% can be realized through experimental verification.
3. The method utilizes an electromagnetic induction method to generate a magnetic field, the solid-liquid two-phase fluid conveyed by the tested industry cuts a magnetic induction line to generate induced electromotive force, and the concentration of a solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, so that automatic real-time test can be realized, and the concentration and the real-time change of the concentration of the solid-phase medium in the flowing dynamic process of the solid-liquid two-phase medium are monitored in real time.
4. The magnetic particles are adopted as the ferrite water-based magnetic fluid, so that the dependence on temperature is small, the interference on a test result caused by temperature change is prevented, and the test accuracy is improved.
5. The induction coil group is connected in series with the reduction coil group, and can resist the reverse voltage of the induced electromotive force generated by the induction coil, and the reduction coil group is arranged to improve the detection rate of the induced electromotive force caused by the magnetization of the magnetic fluid.
6. The exciting coils of the induction coil group and the reduction coil group are all made of helm Huo Cixian rings, so that uniformity of a generated magnetic field is improved, a measured fluid medium is magnetized conveniently, and measurement accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of an apparatus for measuring the concentration of a solid medium in a solid-liquid two-phase fluid according to the present application
FIG. 2 is a schematic diagram of the detection of induced electromotive force in the measurement principle of the apparatus for measuring the concentration of a solid medium in a solid-liquid two-phase fluid according to the present application
FIG. 3 is a waveform diagram of the detection of induced electromotive force in the measurement principle of the apparatus for measuring the concentration of solid phase medium in solid-liquid two-phase fluid according to the present application
Wherein: 1-1 is a first centrifugal pump, 1-2 is a second centrifugal pump, 2.1 is a first stop valve, 2.2 is a second stop valve, 2.3 is a third stop valve, 2.4 is a fourth stop valve, 2.5 is a needle valve, 3.1 is a first tee, 3.1 is a second tee, 4 is an air compressor, 5 is a mass flowmeter, 6 is an air separator, 7.1 is a first pressure gauge, 7.2 is a second pressure gauge, 8 is a pressure data recorder, 9 is an induction coil set, 9.1 is an induction coil, 9.2 is an excitation coil, 10 is a reduction coil set, 10.1 is an induction coil, 10.2 is an excitation coil, 11 is a signal amplifier, 12 is a high pass filter, 13 is an analog-digital conversion computer, 14 is a bipolar power supply, 15 is a signal generator, and 16 is a sampling volume box.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the present application will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1-3, a device for measuring the concentration of a solid medium in a solid-liquid two-phase fluid is disclosed, wherein a magnetic field is generated by using an electromagnetic induction method, a magnetic induction line is cut by the measured solid-liquid two-phase fluid, an induced electromotive force is generated, the concentration of the solid medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, distilled water is used for diluting an aqueous magnetic fluid to a concentration of 0.1vol.%, the diluted aqueous magnetic fluid is used as a liquid carrier of the measured solid-liquid two-phase fluid to be mixed with the measured solid-liquid two-phase fluid, and solid phase magnetic particles in the aqueous magnetic fluid are ferrite.
The device comprises a first centrifugal pump 1-1, wherein a liquid outlet of the first centrifugal pump 1-1 is connected with a first tee joint 3.1 through a first stop valve 2.1; the device is also provided with an air compressor 4, an air outlet of the air compressor 4 is connected with a mass flowmeter 5 through a needle valve 2.5, and a compressed air conveying pipeline is connected with a medium conveying pipe of the first centrifugal pump 1; the magnetic solid-liquid two-phase fluid at the left end outlet of the first tee joint 3.1 is mixed with the compressed air output by the mass flowmeter 5 and flows along a vertical pipeline, an air separator 6 is arranged at the tail end of the vertical pipeline, the solid-liquid two-phase fluid after air separation is continuously conveyed to the tested inclined pipeline, and finally the solid-liquid two-phase fluid returns to the inlet of the first centrifugal pump 1-1 through the second tee joint 3.2 and the second stop valve 2.1; and connecting the inclined conduit and the second tee 3.2 is a further vertical conduit, the end of which is connected to the sample volume tank 16 by a switch valve.
Wherein, the detected inclined pipeline is sleeved with an induction coil group 9, and the induction coil group 9 is also connected with a reduction coil group 10 in series; the induction coil group 9 and the reduction coil 10 each have an induction coil (9.1, 10.1) and an excitation coil (9.2, 10.2); the induction coil 9.1 on one side of the induction coil group 9 is connected to the induction coil 10.1 on one side of the signal amplifier 11 and the reduction coil group 10 respectively, the induction coil 9.1 on the other side of the induction coil group 9 is also connected to the induction coil 10.1 on the other side of the signal amplifier 11 and the reduction coil group 10 respectively, and the induction coils 10.1 on both sides of the reduction coil group 10 are connected to the signal amplifier 11 respectively; the signal amplifier 11 is connected with a high-pass filter 12, and the high-pass filter 12 is connected with an analog-digital conversion computer 13; the exciting coil 10.2 of the reduction coil set 10 is connected with a bipolar power supply 14, the bipolar power supply 14 is connected with a signal generator 15, and the induction coil 10.1 on one side of the reduction coil set 10 is connected with the exciting coil 9.2 of the induction coil set 9.
All the pipelines of the device are transparent pipelines, so that the flow form of the fluid medium can be observed conveniently.
The sampling volume tank 16 accommodates an industrially conveyed solid-liquid two-phase fluid, which is a fluid medium to be measured.
A parallel pipeline connected with a pipeline where the first centrifugal pump 1-1 is located is further arranged between the first tee joint 3.1 and the second tee joint 3.2, a third stop valve 2.3 and a fourth stop valve 2.4 are arranged on two sides of the parallel pipeline, and a second centrifugal pump 1-2 is arranged between the third stop valve 2.3 and the fourth stop valve 2.4.
The second centrifugal pump is connected with the clear water tank and driven by a motor.
The inclination angle of the inclined pipeline is 30 degrees, and the inclined pipeline is used for simulating the influence of gravity on concentration measurement when the pipeline of the solid-liquid two-phase fluid conveyed industrially is inclined.
Pressure gauges 7.1 and 7.2 are arranged at two ends of the inclined pipeline to be measured, and a pressure data recorder 8 is connected between the two pressure gauges and is used for detecting and recording the flow form of the fluid medium in the inclined pipeline.
The exciting coils (9.2, 10.2) of the induction coil group 9 and the reduction coil group 10 are helmholtz magnetic coils.
An analog-to-digital converter in the analog-to-digital conversion computer converts the instantaneous induced electromotive force into a digital signal, the sampling frequency is 1000hz, the sampling number is 5000, the specification of the analog-to-digital converter is that the voltage input range is plus or minus 10V, and the resolution is 16 bits.
The theoretical basis of the measurement is that the induced electromotive force V generated by cutting the magnetic induction line by the fluid medium in the inclined pipeline, the magnetic field intensity H of the inclined pipeline, the number n of turns of the induction coil and the relative magnetization M of the fluid medium in the inclined pipeline mf Has the following relationship:
wherein mu 0 For the permeability of the fluid medium in the inclined pipe, t is the time of sampling the test data, and S is the cross-sectional area of the inclined pipe perpendicular to the direction of the magnetic induction line.
The device for measuring the concentration of the solid phase medium in the solid-liquid two-phase fluid comprises the following steps:
step 1, preparing aqueous magnetic fluid, namely diluting the aqueous magnetic fluid to a concentration of 0.1vol.% by using distilled water, taking the diluted aqueous magnetic fluid with the concentration of 0.1vol.% as a liquid phase carrier of a solid-liquid two-phase fluid to be tested, and mixing the aqueous magnetic fluid with the solid-liquid two-phase fluid to be tested, wherein the solid phase magnetic particles in the aqueous magnetic fluid are ferrite;
step 2, a first stop valve 2.1 and a second stop valve 2.2 are opened, a third stop valve 2.3 and a fourth stop valve 2.4 are closed, a first centrifugal pump 1-1 is started to enable medium in a pipeline to circularly flow, only aqueous magnetic fluid with the concentration of 0.1vol.% is circularly conveyed in the pipeline by the first centrifugal pump 1-1, an air compressor 4 is started, a needle valve 2.5 is opened, pressurized gas is conveyed into the pipeline to drive the aqueous magnetic fluid to be uniformly mixed, an air separator 6 is started to separate gas, a bipolar power supply 14 is activated to convey current to an exciting coil 10.2 of a reduction coil set 10 through a signal generator 15, the reduction coil set 10 is connected with an induction coil set 9 in series, so that the induction coil set 9 induces magnetic fields, the induction coil 9.1 on one side of the induction coil set 9 is respectively connected with an induction coil 10.1 on one side of the signal amplifier 11 and the reduction coil set 10, the induction coil 9.1 on the other side of the induction coil set 9 is respectively connected with the signal amplifier 11 and the induction coil 10.1 on the other side of the reduction coil set 10, and the induction coil set 10 is respectively connected with the signal amplifier 11 on the two sides of the induction coil set 10; the signal amplifier 11 is connected with a high-pass filter 12, and the high-pass filter 12 is connected with an analog-digital conversion computer 13; an induction coil 10.1 on one side of the reduction coil set 10 is connected to an excitation coil 9.2 of the induction coil set 9, and an analog-to-digital conversion computer 13 reads a water-based magnetic fluid cutting induction line in an inclined pipeline to generate an induced electromotive force V (q=0);
step 3, discharging a predetermined volume of aqueous magnetic fluid in a measuring device, opening a switch valve of a sampling volume box 16 to mix the predetermined volume of sampled solid-liquid two-phase fluid with 0.1vol.% of aqueous magnetic fluid, closing the switch valve of the sampling volume box 16, continuously utilizing an air compressor 4 to convey pressure gas into a pipeline to drive the aqueous magnetic fluid to be uniformly mixed with the sampled measured solid-liquid two-phase fluid, opening an air separator 6 to separate gas, continuously activating a bipolar power supply 14 through a signal generator 15 to convey current to an exciting coil 10.2 of a reduction coil group 10, and reading a fluid medium cutting magnetic induction line obtained by mixing the aqueous magnetic fluid in an inclined pipeline with the sampled measured solid-liquid two-phase fluid through an analog-digital conversion computer 13 to generate an induced electromotive force V (q) exp )；
Step 4, discharging all mixed fluid media in the pipeline, closing an air separator 6, closing a first stop valve 2.1, a second stop valve 2.2 and a first centrifugal pump 1-1, closing a signal generator 15 and a bipolar power supply 14, opening a third stop valve 2.3 and a fourth stop valve 2.4, starting a second centrifugal pump 1-2 to suck clean water, cleaning the pipeline, and then conveying dry pressure gas into the pipeline by using an air compressor 4 to dry the pipeline;
step 5, the third stop valve 2.3, the fourth stop valve 2.4 and the second centrifugal pump 1-2 are closed, the first stop valve 2.1 and the second stop valve 2.2 are opened, the first centrifugal pump 1-1 is started, a switch of the sampling volume box 16 is opened to fill the pipeline with the sampled solid-liquid two-phase fluid, the first centrifugal pump 1-1 only circularly drives the sampled solid-liquid two-phase fluid to be tested in the pipeline, the air compressor 4 is continuously utilized to convey pressure gas into the pipeline to drive the sampled solid-liquid two-phase fluid to be uniformly mixed, the air separator 6 is opened to separate gas, the bipolar power supply 14 is activated to convey current to the exciting coil 10.2 of the reduction coil group 10 through the signal generator 15, and the sampled solid-liquid two-phase fluid cutting magnetic induction line in the inclined pipeline is read through the analog-digital conversion computer 13 to generate induced electromotive force V (q=1);
step 6, correcting and calculating the concentration q of the solid phase medium in the measured solid-liquid two-phase fluid:
and DeltaV (cal.) ＝V rms(q＝0) -V rms(q＝1) Wherein V is rms(q＝0) When the water-based magnetic fluid is only in the inclined pipeline in the step 2, the root mean square value of a plurality of groups of induced electromotive force V (q=0) values generated by the cutting magnetic induction line is obtained; wherein V is rms(exp) When the water-based magnetic fluid in the inclined pipeline in the step 3 is mixed with the sampled measured solid-liquid two-phase fluid, a plurality of groups of induced electromotive forces V (q) exp ) Root mean square value of the value; wherein V is rms(q＝1) When the sample is only the solid-liquid two-phase fluid to be measured in the inclined pipeline in the step 5, the root mean square value of the values of a plurality of groups of induced electromotive forces V (q=1) generated by the cutting magnetic induction lines is obtained.
The technical scheme provided by the embodiment of the application has the following technical effects:
1. the air compressor is utilized to form bubbles to drive the rapid mixing of the solid phase medium and the liquid phase medium in the solid-liquid two phases, so as to simulate the flowing form of the solid-liquid two-phase medium in the actual industrial production process.
2. And the measurement result is calibrated, so that a final measurement result is obtained, the accuracy is high, and the accurate measurement of the solid-phase medium with the concentration lower than 0.84vol.% can be realized through experimental verification.
3. The method utilizes an electromagnetic induction method to generate a magnetic field, the solid-liquid two-phase fluid conveyed by the tested industry cuts a magnetic induction line to generate induced electromotive force, and the concentration of a solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, so that automatic real-time test can be realized, and the concentration and the real-time change of the concentration of the solid-phase medium in the flowing dynamic process of the solid-liquid two-phase medium are monitored in real time.
4. The magnetic particles are adopted as the ferrite water-based magnetic fluid, so that the dependence on temperature is small, the interference on a test result caused by temperature change is prevented, and the test accuracy is improved.
5. The induction coil group is connected in series with the reduction coil group, and can resist the reverse voltage of the induced electromotive force generated by the induction coil, and the reduction coil group is arranged to improve the detection rate of the induced electromotive force caused by the magnetization of the magnetic fluid.
6. The exciting coils of the induction coil group and the reduction coil group are all made of helm Huo Cixian rings, so that uniformity of a generated magnetic field is improved, a measured fluid medium is magnetized conveniently, and measurement accuracy is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. The device is characterized in that a magnetic field is generated by using an electromagnetic induction method, a magnetic induction line is cut by the measured solid-liquid two-phase fluid, induced electromotive force is generated, the concentration of the solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, distilled water is utilized to dilute aqueous magnetic fluid to 0.1vol.% concentration, the diluted aqueous magnetic fluid with the concentration of 0.1vol.% is used as a liquid carrier of the measured solid-liquid two-phase fluid to be mixed with the measured solid-liquid two-phase fluid, and the solid phase magnetic particles in the aqueous magnetic fluid are ferrite;
the centrifugal pump is characterized by comprising a first centrifugal pump (1-1), wherein a liquid outlet of the first centrifugal pump (1-1) is connected with a first tee joint (3.1) through a first stop valve (2.1); the device is also provided with an air compressor (4), wherein an air outlet of the air compressor (4) is connected with a mass flowmeter (5) through a needle valve (2.5), and a compressed air conveying pipeline is connected with a medium conveying pipe of the first centrifugal pump (1-1); after the magnetic solid-liquid two-phase fluid at the left end outlet of the first tee joint (3.1) is mixed with the compressed air output by the mass flowmeter (5), the mixture flows along a vertical pipeline, an air separator (6) is arranged at the tail end of the vertical pipeline, the solid-liquid two-phase fluid after air separation is continuously conveyed to a tested inclined pipeline, and finally the solid-liquid two-phase fluid returns to the inlet of the first centrifugal pump (1-1) through a second tee joint (3.2) and a second stop valve (2.2); the other vertical pipeline is connected with the inclined pipeline and the second tee joint (3.2), and the tail end of the other vertical pipeline is connected with the sampling volume tank (16) through a switch valve;
wherein, the detected inclined pipeline is sleeved with an induction coil group (9), and the induction coil group (9) is also connected with a reduction coil group (10) in series; the induction coil group (9) and the reduction coil group (10) each have an induction coil (9.1, 10.1) and an excitation coil (9.2, 10.2); the induction coil (9.1) on one side of the induction coil group (9) is respectively connected to the signal amplifier (11) and the induction coil (10.1) on one side of the reduction coil group (10), the induction coil (9.1) on the other side of the induction coil group (9) is also respectively connected to the signal amplifier (11) and the induction coil (10.1) on the other side of the reduction coil group (10), and the induction coils (10.1) on both sides of the reduction coil group (10) are respectively connected to the signal amplifier (11); the signal amplifier (11) is connected with the high-pass filter (12), and the high-pass filter (12) is connected with the analog-to-digital conversion computer (13); the exciting coil (10.2) of the reduction coil group (10) is connected with a bipolar power supply (14), the bipolar power supply (14) is connected with a signal generator (15), and the induction coil (10.1) on one side of the reduction coil group (10) is connected with the exciting coil (9.2) of the induction coil group (9).
2. The device for measuring the concentration of a solid medium in a solid-liquid two-phase fluid according to claim 1, wherein all the pipelines of the device are transparent pipelines, so that the flow form of the fluid medium can be observed conveniently.
3. The device for measuring the concentration of the solid phase medium in the solid-liquid two-phase fluid according to claim 1, wherein the sampling volume box (16) accommodates the solid-liquid two-phase fluid which is industrially conveyed, namely the measured fluid medium.
4. The device for measuring the concentration of the solid medium in the solid-liquid two-phase fluid according to claim 1, wherein a parallel pipeline connected with a pipeline where the first centrifugal pump (1-1) is located is further arranged between the first tee joint (3.1) and the second tee joint (3.2), a third stop valve (2.3) and a fourth stop valve (2.4) are arranged on two sides of the parallel pipeline, and a second centrifugal pump (1-2) is arranged between the third stop valve (2.3) and the fourth stop valve (2.4).
5. The apparatus for measuring the concentration of a solid medium in a solid-liquid two-phase fluid according to claim 4, wherein the second centrifugal pump (1-2) is connected to a clean water tank, and the second centrifugal pump (1-2) is driven by a motor.
6. The apparatus for measuring the concentration of a solid medium in a solid-liquid two-phase fluid according to claim 1, wherein the inclination angle of the inclined pipe is 30 degrees.
7. The device for measuring the concentration of the solid-phase medium in the solid-liquid two-phase fluid according to claim 1, wherein pressure gauges (7.1) and (7.2) are arranged at two ends of the measured inclined pipeline, and a pressure data recorder (8) is connected between the two pressure gauges.
8. The device for measuring the concentration of the solid-phase medium in the solid-liquid two-phase fluid according to claim 1, wherein the exciting coils (9.2, 10.2) of the induction coil group (9) and the reduction coil group (10) are all helmholtz magnetic coils.
9. The device for measuring the concentration of a solid medium in a solid-liquid two-phase fluid according to claim 1, wherein an analog-to-digital converter in an analog-to-digital conversion computer converts the instantaneous induced electromotive force into a digital signal, the sampling frequency is 1000hz, the sampling number is 5000, the specification of the analog-to-digital converter is that the voltage input range is plus or minus 10V, and the resolution is 16 bits.
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