CN112858463A - Device for measuring solid-phase medium concentration in solid-liquid two-phase fluid - Google Patents
Device for measuring solid-phase medium concentration in solid-liquid two-phase fluid Download PDFInfo
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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 invention 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, and the concentration of the solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, so that the automatic real-time test can be realized, and the concentration of the solid-phase medium and the real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process can be monitored in real. Air bubbles are formed by an air compressor to drive the solid-phase medium and the liquid-phase medium in the solid phase and the liquid phase to be rapidly mixed, and the aqueous magnetofluid with magnetic particles as ferrite has small dependence on temperature, thereby preventing the interference on a test result caused by the change of the temperature and improving the test accuracy. 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 invention relates to the field of fluid medium concentration testing, in particular to a device for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid.
Background
In the fields of modern industries such as petroleum, chemical engineering, nuclear power, ocean engineering and the like, a conveying pipeline is widely applied to the transmission of various fluid media, and solid-liquid two-phase fluid is the most common conveying medium in the industrial application. In the 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 the efficiency and the yield in some production processes and the monitoring of the whole production.
In the prior art, the detection mode of the concentration of a solid-phase medium in a solid-liquid two-phase fluid usually 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, after a period of time, the liquid in the solid waste is completely volatilized, then weighing is carried out, and the concentration of the solid phase and the liquid phase can be calculated by calculating the mass difference before and after heating. The detection mode has simple principle and low cost, can carry out rough detection under the condition of low requirement on analysis data of solid-phase medium components, and has wide application. The main defects of the detection mode are that the automation degree is not high, although 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 real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process is not beneficial to be monitored in real time; 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 testing precision, multiple samples are measured one by one, the workload is large, the data processing is complicated, the error accumulation is easy, and the measuring accuracy is difficult to ensure.
Disclosure of Invention
The invention aims to provide a device for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid, which aims to solve the technical problems in the background technology, wherein the concentration of the solid-phase medium is limited to be volume percent (vol%) of the solid-phase medium in the solid-liquid two-phase fluid, and the invention provides the following technical scheme for realizing the aim:
a device for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid generates a magnetic field by using an electromagnetic induction method, 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, an aqueous magnetofluid is diluted to the concentration of 0.1 vol.% by using distilled water, the diluted aqueous magnetofluid with the concentration of 0.1 vol.% is used as a liquid phase carrier of the measured solid-liquid two-phase fluid to be mixed with the measured solid-liquid two-phase fluid, and magnetic particles of a solid phase in the aqueous magnetofluid 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 further provided, an air outlet of the air compressor is connected with the mass flow meter through a needle valve, and a delivery pipeline of compressed air is connected with the medium delivery pipe chariot 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 flow meter and then 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 inclined pipeline to be tested, and finally the fluid passes through the second tee joint and then returns to the inlet of the first centrifugal pump through the second stop valve; and the other vertical pipeline is connected with the inclined pipeline and 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 an inclined pipeline to be tested, an induction coil group, a reduction coil group and a power supply, wherein the outer sleeve of the inclined pipeline to be tested is provided with the induction coil group, and the induction coil group is also connected with the reduction coil group in series; the induction coil group and the reduction coil are provided with induction coils and excitation coils; the induction coil at one side of the induction coil group is respectively connected to the induction coil at one side of the signal amplifier and the reduction coil group, the induction coil at the other side of the induction coil group is also respectively connected to the induction coil at the other side of the signal amplifier and the reduction coil group, and the induction coils at 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 group 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 group is connected with the exciting coil of the induction coil group.
All the pipelines of the device are transparent pipelines, so that the flowing form of the fluid medium is convenient to observe.
The sampling volume box contains industrially conveyed solid-liquid two-phase fluid, and the industrially conveyed solid-liquid two-phase fluid is the fluid medium to be measured.
A parallel pipeline of the pipeline where the first centrifugal pump is located 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 clean water tank and driven by the motor.
The inclined angle of the inclined pipe is 30 degrees.
The pressure gauges are arranged at two ends of the inclined pipeline to be measured, and the pressure data recorder is connected between the two pressure gauges.
The exciting coils of the induction coil group and the reduction coil group are all Helmholtz magnetic coils.
An analog-to-digital converter in the analog-to-digital conversion computer converts instantaneous induced electromotive force into digital signals, the sampling frequency is 1000hz, the sampling number is 5000, the specifications of the analog-to-digital converter are that the voltage input range is plus or minus 10V, and the resolution is 16 bit.
The theoretical basis of the measurement is that the induced electromotive force V generated by cutting the magnetic induction lines by the fluid medium in the inclined pipeline, the magnetic field intensity H of the inclined pipeline, the number of turns n of the induction coil and the relative magnetization M of the fluid medium in the inclined pipelinemfHas the following relationship:
wherein mu0The magnetic permeability of the fluid medium in the inclined pipeline is shown, t is the sampling time of the test data, and S is the cross-sectional area of the inclined pipeline perpendicular to the direction of the magnetic induction line.
The device of the invention measures the solid phase medium concentration in the solid-liquid two-phase fluid by using the following steps:
step 1, preparing aqueous magnetofluid, namely diluting the aqueous magnetofluid to a concentration of 0.1 vol.% by using distilled water, and mixing the diluted aqueous magnetofluid with the concentration of 0.1 vol.% with the measured solid-liquid two-phase fluid as a liquid phase carrier of the measured solid-liquid two-phase fluid, wherein magnetic particles of a solid phase in the aqueous magnetofluid are ferrite;
step 2, opening a first stop valve and a second stop valve, closing a third stop valve and a fourth stop valve, starting a first centrifugal pump to enable a medium in a pipeline to circularly flow, circularly conveying only aqueous magnetic fluid with the concentration of 0.1 vol.% in the pipeline by using the first centrifugal pump, starting an air compressor, opening a needle valve, conveying pressure gas into the pipeline to drive the aqueous magnetic fluid to be uniformly mixed, starting an air separator to separate gas, activating a bipolar power supply through a signal generator to convey current to an excitation coil of a reduction coil group, connecting the reduction coil group and an induction coil group in series to enable the induction coil group to induce a magnetic field, connecting an induction coil on one side of the induction coil group to an induction coil on one side of a signal amplifier and the reduction coil group respectively, and connecting an induction coil on the other side of the induction coil group to an induction coil on the other side of the signal amplifier and the reduction coil group respectively, 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; an induction coil on one side of the reduction coil group is connected to an excitation coil of the induction coil group, and an induced electromotive force V (q is 0) is generated by reading a water-based magnetic fluid cutting magnetic induction line in the inclined pipeline through an analog-to-digital conversion computer;
step 3, discharging the aqueous magnetofluid with the preset volume in the measuring device, opening the switch valve of the sampling volume box to ensure that the sampled solid-liquid two-phase fluid with the preset volume is 0.1 vol%After the aqueous magnetic fluid is mixed, a switch valve of the sampling volume box is closed, an air compressor is continuously utilized to convey pressure gas into the pipeline to drive the aqueous magnetic fluid to be uniformly mixed with the sampled measured solid-liquid two-phase fluid, an air separator is opened to separate gas, a bipolar power supply is continuously activated by a signal generator to convey current to an excitation coil of a reduction coil group, and a fluid medium cut magnetic induction line formed by mixing the aqueous magnetic fluid in the inclined pipeline and the sampled measured solid-liquid two-phase fluid is read by an analog-to-digital conversion computer to generate induced electromotive force V (q)exp)；
Step 4, discharging all mixed fluid media in the pipeline, closing the air separator, closing the first stop valve, the second stop valve and the first centrifugal pump, closing the signal generator and the bipolar power supply, opening the third stop valve and the fourth stop valve, starting the second centrifugal pump to pump clean water, cleaning the pipeline, and then conveying dry pressure gas into the pipeline by using an air compressor to dry the pipeline;
and 6, correcting and calculating the concentration q of the solid-phase medium in the measured solid-liquid two-phase fluid:
and Δ V(cal.)＝Vrms(q＝0)-Vrms(q＝1)In which V isrms(q＝0)When only the aqueous magnetofluid is in the inclined pipeline in the step 2, the magnetofluid cuts the magnetic induction lines to generate a plurality of groups of induced electromotive force V (q is 0) values; wherein Vrms(exp)When the aqueous magnetofluid in the inclined pipeline in the step 3 is mixed with the sampled measured solid-liquid two-phase fluid, the mixture cuts a plurality of groups of induced electromotive force V (q) generated by magnetic induction linesexp) A root mean square value of the values; wherein Vrms(q＝1)And 5, when only the measured solid-liquid two-phase fluid is sampled in the inclined pipeline in the step 5, cutting the magnetic induction lines to generate multiple groups of induced electromotive force V (q is 1) values.
Technical solution according to the present invention, the following technical effects are achieved:
1. air bubbles formed by an air compressor are used for driving the solid-phase medium and the liquid-phase medium in the solid-liquid two-phase to be rapidly mixed, so that the flowing form of the solid-liquid two-phase medium in the actual industrial production process is simulated.
2. The measurement result is calibrated to obtain the final measurement result, the accuracy is high, and the test proves that the accurate measurement of the solid phase medium with the concentration of less than 0.80 vol.% can be realized.
3. The method is characterized in that a magnetic field is generated by an electromagnetic induction method, the measured industrially conveyed 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, automatic real-time test can be realized, and the concentration of the solid-phase medium and the real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process can be monitored in real time.
4. The aqueous magnetofluid with magnetic particles as ferrite has small temperature dependence, prevents the interference on the test result caused by the change of temperature and improves the test accuracy.
5. The induction coil group and the reduction coil group are connected in series, and can resist the reverse voltage of the induced electromotive force generated by the induction coil, and the reduction coil group can 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 Helmholtz magnetic coils, so that the uniformity of a generated magnetic field is improved, the measured fluid medium is conveniently magnetized, and the measurement accuracy is improved.
Drawings
FIG. 1 is a schematic view of the apparatus for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid according to the present invention
FIG. 2 is a schematic diagram of the detection of induced electromotive force in the measurement principle of the device for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to the present application
FIG. 3 is a waveform diagram of the induced electromotive force detected in the measurement principle of the device for measuring the concentration of a solid-phase medium in a 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 joint, 3.1 is a second tee joint, 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 group, 9.1 is an induction coil, 9.2 is an excitation coil, 10 is a reduction coil group, 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-to-digital conversion computer, 14 is a bipolar power supply, 15 is a signal generator, and 16 is a sampling volume box.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, a device for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid, the device generates a magnetic field by using an electromagnetic induction method, 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, an aqueous magnetic fluid is diluted to a concentration of 0.1 vol.% by using distilled water, the aqueous magnetic fluid with the diluted concentration of 0.1 vol.% is used as a liquid phase carrier of the measured solid-liquid two-phase fluid to be mixed with the measured solid-liquid two-phase fluid, and magnetic particles of a solid phase in the aqueous magnetic fluid are.
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 air outlet of the air compressor 4 is connected with a mass flow meter 5 through a needle valve 2.5, and a delivery pipeline of compressed air is connected with a medium delivery pipe chariot 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 flow meter 5 and then flows along the 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 inclined pipeline to be tested, and finally the fluid passes through a second tee joint 3.2 and then returns to the inlet of the first centrifugal pump 1-1 through a 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 means of a switch valve.
Wherein, the outside of the inclined pipeline to be measured 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 assembly 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 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 two sides of the reduction coil group 10 are respectively connected to the signal amplifier 11; the signal amplifier 11 is connected with a high-pass filter 12, and the high-pass filter 12 is connected with an analog-to-digital conversion computer 13; the exciting coil 10.2 of the reducing coil assembly 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 reducing coil assembly 10 is connected with the exciting coil 9.2 of the induction coil assembly 9.
All the pipelines of the device are transparent pipelines, so that the flowing form of the fluid medium is convenient to observe.
The sampling volume box 16 contains a solid-liquid two-phase fluid which is industrially conveyed, and the solid-liquid two-phase fluid which is industrially conveyed is a fluid medium to be measured.
A parallel pipeline of 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 clean water tank and driven by the 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 solid-liquid two-phase fluid conveyed in industry is inclined.
The 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 used for detecting and recording the flowing form of fluid media in the inclined pipeline.
The exciting coils (9.2, 10.2) of the induction coil set 9 and the restoring coil set 10 both adopt Helmholtz magnetic coils.
An analog-to-digital converter in the analog-to-digital conversion computer converts instantaneous induced electromotive force into digital signals, the sampling frequency is 1000hz, the sampling number is 5000, the specifications of the analog-to-digital converter are that the voltage input range is plus or minus 10V, and the resolution is 16 bit.
The theoretical basis of the measurement is that the induced electromotive force V generated by cutting the magnetic induction lines by the fluid medium in the inclined pipeline, the magnetic field intensity H of the inclined pipeline, the number of turns n of the induction coil and the relative magnetization M of the fluid medium in the inclined pipelinemfHas the following relationship:
wherein mu0The magnetic permeability of the fluid medium in the inclined pipeline is shown, t is the sampling time of the test data, and S is the cross-sectional area of the inclined pipeline perpendicular to the direction of the magnetic induction line.
The device of the invention measures the solid phase medium concentration in the solid-liquid two-phase fluid by using the following steps:
step 1, preparing aqueous magnetofluid, namely diluting the aqueous magnetofluid to a concentration of 0.1 vol.% by using distilled water, and mixing the diluted aqueous magnetofluid with the concentration of 0.1 vol.% with the measured solid-liquid two-phase fluid as a liquid phase carrier of the measured solid-liquid two-phase fluid, wherein magnetic particles of a solid phase in the aqueous magnetofluid are ferrite;
step 2, opening a first stop valve 2.1 and a second stop valve 2.2, closing a third stop valve 2.3 and a fourth stop valve 2.4, starting a first centrifugal pump 1-1 to enable a medium in a pipeline to circularly flow, circularly conveying only 0.1 vol.% aqueous magnetic fluid in the pipeline by using the first centrifugal pump 1-1, starting an air compressor 4, opening a needle valve 2.5, conveying pressure gas into the pipeline to drive the aqueous magnetic fluid to be uniformly mixed, starting an air separator 6 to separate gas, activating a bipolar power supply 14 through a signal generator 15 to convey current to an excitation coil 10.2 of a reduction coil group 10, connecting the reduction coil group 10 and an induction coil group 9 in series to enable the induction coil group 9 to induce a magnetic field, wherein an induction coil 9.1 on one side of the induction coil group 9 is respectively connected to a signal amplifier 11 and an induction coil 10.1 on one side of the reduction coil group 10, and an 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 reduction coil group 10 The induction coil 10.1 at the other side of the group 10, and the induction coils 10.1 at the two sides of the reduction coil group 10 are respectively connected to the signal amplifier 11; the signal amplifier 11 is connected with a high-pass filter 12, and the high-pass filter 12 is connected with an analog-to-digital conversion computer 13; an induction coil 10.1 at one side of the reduction coil group 10 is connected to an excitation coil 9.2 of the induction coil group 9, and an induced electromotive force V (q is 0) is generated by reading a water-based magnetic fluid cutting magnetic induction line in an inclined pipeline through an analog-to-digital conversion computer 13;
step 3, releasing the aqueous magnetofluid with the preset volume in the measuring device, and opening the sampling volume box 16Closing the valve to mix the sampled solid-liquid two-phase fluid with the predetermined volume with 0.1 vol.% of aqueous magnetofluid, closing the switch valve of the sampling volume box 16, continuing to utilize the air compressor 4 to convey pressure gas into the pipeline to drive the aqueous magnetofluid to be uniformly mixed with the sampled measured solid-liquid two-phase fluid, opening the air separator 6 to separate gas, continuing to activate the bipolar power supply 14 through the signal generator 15 to convey current to the excitation coil 10.2 of the reduction coil group 10, reading the fluid medium cutting magnetic induction line mixed by the aqueous magnetofluid in the inclined pipeline and the sampled measured solid-liquid two-phase fluid through the analog-to-digital conversion computer 13 to generate induced electromotive force V (q) (q is the induced electromotive force V) generated by cutting the magnetic induction line byexp)；
Step 4, discharging all mixed fluid media in the pipeline, closing the air separator 6, closing the first stop valve 2.1, the second stop valve 2.2 and the first centrifugal pump 1-1, closing the signal generator 15 and the bipolar power supply 14, opening the third stop valve 2.3 and the fourth stop valve 2.4, starting the second centrifugal pump 1-2 to pump clean water, cleaning the pipeline, and then conveying dry pressure gas into the pipeline by using the air compressor 4 to dry the pipeline;
and 6, correcting and calculating the concentration q of the solid-phase medium in the measured solid-liquid two-phase fluid:
and Δ V(cal.)＝Vrms(q＝0)-Vrms(q＝1)In which V isrms(q＝0)When only the aqueous magnetofluid is in the inclined pipeline in the step 2, the magnetofluid cuts the magnetic induction lines to generate a plurality of groups of induced electromotive force V (q is 0) values; wherein Vrms(exp)When the aqueous magnetofluid in the inclined pipeline in the step 3 is mixed with the sampled measured solid-liquid two-phase fluid, the mixture cuts a plurality of groups of induced electromotive force V (q) generated by magnetic induction linesexp) A root mean square value of the values; wherein Vrms(q＝1)And 5, when only the measured solid-liquid two-phase fluid is sampled in the inclined pipeline in the step 5, cutting the magnetic induction lines to generate multiple groups of induced electromotive force V (q is 1) values.
Technical solution according to the technical solution provided in the embodiment of the present application, the present invention achieves the following technical effects:
1. air bubbles formed by an air compressor are used for driving the solid-phase medium and the liquid-phase medium in the solid-liquid two-phase to be rapidly mixed, so that the flowing form of the solid-liquid two-phase medium in the actual industrial production process is simulated.
2. The measurement result is calibrated to obtain the final measurement result, the accuracy is high, and the test proves that the accurate measurement of the solid phase medium with the concentration of less than 0.84 vol.% can be realized.
3. The method is characterized in that a magnetic field is generated by an electromagnetic induction method, the measured industrially conveyed 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, automatic real-time test can be realized, and the concentration of the solid-phase medium and the real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process can be monitored in real time.
4. The aqueous magnetofluid with magnetic particles as ferrite has small temperature dependence, prevents the interference on the test result caused by the change of temperature and improves the test accuracy.
5. The induction coil group and the reduction coil group are connected in series, and can resist the reverse voltage of the induced electromotive force generated by the induction coil, and the reduction coil group can 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 Helmholtz magnetic coils, so that the uniformity of a generated magnetic field is improved, the measured fluid medium is conveniently magnetized, and the measurement accuracy is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A device for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid generates a magnetic field by using an electromagnetic induction method, 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, an aqueous magnetofluid is diluted to the concentration of 0.1 vol.% by using distilled water, the diluted aqueous magnetofluid with the concentration of 0.1 vol.% is used as a liquid phase carrier of the measured solid-liquid two-phase fluid to be mixed with the measured solid-liquid two-phase fluid, and magnetic particles of a solid phase in the aqueous magnetofluid 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 centrifugal pump is characterized by also comprising an air compressor (4), wherein an air outlet of the air compressor (4) is connected with a mass flow meter (5) through a needle valve (2.5), and a delivery pipeline of compressed air is connected with a medium delivery pipe chariot 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 flow meter (5) and then flows along the 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 inclined pipeline to be tested, and finally the fluid returns to the inlet of the first centrifugal pump (1-1) through a second tee joint (3.2) and a second stop valve (2.1); and the connection between the inclined pipeline and the second tee joint (3.2) is another vertical pipeline, and the tail end of the other vertical pipeline is connected with the sampling volume box (16) through a switch valve;
wherein, the outside of the inclined pipeline to be measured 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 assembly (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 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 two sides of the reduction coil group (10) are respectively connected to the signal amplifier (11); the signal amplifier (11) is connected with a high-pass filter (12), and the high-pass filter (12) is connected with an analog-to-digital conversion computer (13); the excitation 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 excitation coil (9.2) of the induction coil group (9).
2. The apparatus for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid according to claim 1, wherein all the pipes of said apparatus are transparent pipes, so as to facilitate observation of the flow pattern of the fluid medium.
3. The apparatus for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to claim 1, wherein the sampling volume tank (16) contains an industrially transported solid-liquid two-phase fluid, which is a fluid medium to be measured.
4. The device for measuring the concentration of a solid-phase medium in a 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 the 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-phase medium in a solid-liquid two-phase fluid according to claim 4, wherein said second centrifugal pump (1-2) is connected to a clean water tank, and said second centrifugal pump (1-2) is driven by a motor.
6. The apparatus for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid according to claim 1, wherein the inclined angle of the inclined pipe is 30 degrees.
7. The apparatus for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid according to claim 1, wherein pressure gauges (7.1) and (7.2) are provided at both ends of the inclined pipe to be measured, and a pressure data recorder (8) is connected between the two pressure gauges.
8. The apparatus for measuring the concentration of a solid-phase medium in a two-phase fluid, according to claim 1, wherein Helmholtz coils are used for the exciting coils (9.2, 10.2) of the induction coil assembly (9) and the reduction coil assembly (10).
9. The apparatus according to claim 1, wherein 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 specifications of the analog-to-digital converter are a voltage input range of plus or minus 10V, and the resolution is 16 bit.
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