CN111060169B - Device and method for measuring non-full pipe flow - Google Patents
Device and method for measuring non-full pipe flow Download PDFInfo
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- CN111060169B CN111060169B CN201911419106.4A CN201911419106A CN111060169B CN 111060169 B CN111060169 B CN 111060169B CN 201911419106 A CN201911419106 A CN 201911419106A CN 111060169 B CN111060169 B CN 111060169B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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Abstract
The invention discloses a non-full pipe flow measuring device and a non-full pipe flow measuring method, and relates to the technical field of single-phase fluid flow measurement. The power rotating pipe rotates at a high speed to drive the fluid to rotate at a high speed to generate centrifugal force to form a liquid ring, so that the flow velocity of the fluid is changed from non-axisymmetric distribution to axisymmetric distribution. By implementing the method, the weight function can be equivalent to 1 under the working condition of the non-full pipe fluid, and the accuracy and the stability of flow measurement are improved.
Description
Technical Field
The invention relates to the technical field of single-phase fluid flow measurement, in particular to a non-full pipe flow measurement device and a non-full pipe flow measurement method.
Background
According to the measurement principle of the traditional electromagnetic flowmeter, the induced electromotive force generated by the electromagnetic flowmeter is not only in direct proportion to the flow velocity and the magnetic field intensity of the fluid, but also related to a weight function; for the electromagnetic flow sensor with a long cylinder type uniform magnetic field, when the flow velocity is in axial symmetry distribution, the action of the weight function can be just equivalent to 1, and the generated induced electromotive force is only linearly related to the average flow velocity.
The traditional electromagnetic flowmeter is designed for full pipe flow, but the working condition is complex in engineering practice, and the condition of non-full pipe often occurs; the common non-full pipe electromagnetic flowmeter measurement method mainly adopts a combination method of a liquid level meter and a flow rate meter, but in a non-full pipe state, the free surface in a pipeline enables the flow rate distribution of fluid to change along with the change of the liquid level, the flow rate is not axisymmetric any more, and a weight function is changed along with the continuous change of the liquid level, so that the influence of the weight function on the electromotive force cannot be ignored, and the measurement precision of the simple combination method of the liquid level meter and the flow rate meter is limited.
Therefore, aiming at the current situation and difficulty of measuring the flow of the non-full pipe electromagnetic flowmeter, the technical personnel in the field are dedicated to develop a non-full pipe flow measuring device and method, wherein the weight function can be equivalent to 1 under the working condition of the non-full pipe fluid, and the induced electromotive force generated by the electromagnetic flowmeter sensor is irrelevant to the flow velocity distribution form under the actual working condition.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the existing non-full pipe fluid flow measurement is subject to constant change of the weighting function along with the change of the liquid level, so that the flow measurement accuracy is not high.
In order to achieve the purpose, the invention provides a non-full pipe flow measuring device which comprises an inlet pipe, an outlet pipe and an electromagnetic flow measuring device.
Further, the inlet pipe and the outlet pipe have the same inner diameter as the power rotating pipe.
Furthermore, a swirler is coaxially installed in a tube cavity of the power rotating tube, and the swirler is tightly connected with the inner wall of the power rotating tube.
Further, still include transmission, motor, transmission connect the motor with the rotatory pipe of power, the motor drive the rotatory pipe of power rotates.
Further, the distance between the cyclone and the electromagnetic flow measuring device is 2-6 times of the inner diameter of the power rotating pipe.
Optionally, the electromagnetic flow measuring device includes an electromagnetic flow velocity measuring device, a liquid ring thickness measuring device, and a first signal processing module; the electromagnetic flow velocity measuring device is configured to apply Faraday's law of electromagnetic induction to measure an average flow velocity signal of the fluid in the outlet pipe, the liquid ring thickness measuring device is configured to apply one or a combination of conductivity method, capacitance method, ray method, ultrasonic method, image processing method and process tomography principle to measure a liquid ring thickness signal of the fluid in the outlet pipe, and the first signal processing module is configured to receive and process output signals of the electromagnetic flow velocity measuring device and the liquid ring thickness measuring device to obtain the flow rate of the fluid in the outlet pipe.
Optionally, the electromagnetic flow measuring device comprises a composite measuring device configured to output an average flow velocity signal and a liquid ring thickness signal of the fluid in the outlet pipe, and a second signal processing module configured to receive and process the output signal of the composite measuring device to obtain the flow rate of the fluid in the outlet pipe.
Further, the synthetic measuring device comprises a plurality of pairs of point electrodes and a multi-way switch group corresponding to the plurality of pairs of point electrodes, and the synthetic measuring device is configured to apply Faraday's law of electromagnetic induction to simultaneously measure induced electromotive force and fluid electrical impedance through the plurality of pairs of point electrodes and the multi-way switch group, and obtain a mean flow velocity signal and a liquid ring thickness signal of the fluid in the outlet pipe.
Furthermore, the synthetic measuring device comprises a plurality of pairs of capacitive electrodes and a multi-way switch group corresponding to the plurality of pairs of capacitive electrodes, and the induced electromotive force and the fluid capacitive reactance are measured simultaneously to obtain an average flow velocity signal and a liquid ring thickness signal of the fluid in the outlet pipe.
The invention also provides a method for measuring flow by adopting the non-full pipe flow measuring device, which comprises the following steps:
step 1: a non-full pipe of fluid enters the power swivel pipe through the inlet pipe;
step 2: the motor outputs power to drive the power rotating pipe to rotate at a high speed through the transmission device and drive the swirler to rotate at a high speed, and the power rotating pipe and the swirler jointly drive the non-full pipe fluid in the pipe to rotate at a high speed to generate centrifugal force;
and step 3: under the action of centrifugal force, the distribution state of the non-full pipe fluid is changed in the power rotating pipe, the fluid distribution state with free liquid level height at the inlet pipe is changed into the annular fluid distribution state with liquid ring thickness at the outlet pipe, the liquid flow speed is changed from non-axisymmetric distribution into axisymmetric distribution, and the action of a weight function is equivalent to 1 when the Faraday's law of electromagnetic induction is used for measuring the average liquid ring flow speed;
and 4, step 4: the electromagnetic flow measuring device measures the thickness and the average flow velocity of the liquid ring, and the non-full pipe flow is calculated by applying the following formula:
wherein Q is the non-full pipe flow, D is the inner diameter of the measured pipe, H is the liquid ring thickness, and v is the average flow velocity of the fluid;
the average flow velocity v is determined by the following equation:
in the formula, E is induced electromotive force, k is an instrument constant, B is magnetic induction intensity, and C is a liquid ring shape coefficient;
the liquid ring shape coefficient C is determined by the following formula:
wherein f is a constant, and is obtained by calibration.
Compared with the prior art, the invention firstly rotates the fluid at high speed, so that the fluid distribution condition with free liquid level height is changed into the annular fluid distribution condition with liquid ring thickness, and the liquid flow speed is changed into axisymmetric distribution from non-axisymmetric distribution. In this case, when the faraday's law of electromagnetic induction is used to measure the average flow velocity of the liquid ring, the function of the weight function can be equivalent to 1, and the induced electromotive force generated is independent of the inlet flow velocity distribution form, thereby improving the measurement accuracy of the electromagnetic flowmeter under the condition of non-full pipe fluid.
Compared with the prior art, the invention at least has the following beneficial technical effects:
1) the invention utilizes the rotation of the fluid to change the non-axisymmetric distribution of the fluid in the pipe to be measured into axisymmetric distribution, optimizes the flow measurement model and improves the accuracy of flow measurement;
2) the invention organically combines the liquid level meter and the flow meter into a synthetic measuring device, simplifies the number of the measuring devices, improves the accuracy of measured data and reduces the maintenance cost of the device.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic overall structure of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an electromagnetic flow measurement device in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of an electromagnetic flow measurement device in accordance with another preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of an electromagnetic flow measuring device in accordance with yet another preferred embodiment of the present invention;
FIG. 5 is a schematic view of a non-full pipe fluid distribution through the inlet pipe;
fig. 6 is a schematic illustration of the distribution of fluid flowing through an outlet tube.
Wherein: 1-inlet pipe, 2-sealing device, 3-bearing, 4-transmission device, 5-motor, 6-cyclone, 7-power rotating pipe, 8-electromagnetic flow measuring device, 9-outlet pipe, 10-liquid ring thickness measuring device, 11-electromagnetic flow velocity measuring device, 12-first signal processing module, 13-synthetic measuring device, 14-second signal processing module, 15-point electrode and 16-capacitance electrode.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components in the drawings has been exaggerated where appropriate to make the illustration clearer; the fluid is used to distinguish the filling portion of the cross-line in fig. 3 to 6.
As shown in fig. 1, the present invention provides a non-full pipe flow measuring device comprising an inlet pipe 1, a power rotating pipe 7 and an outlet pipe 9; the inlet pipe 1 and the outlet pipe 9 are fixedly arranged, the power rotating pipe 7 is arranged between the inlet pipe 1 and the outlet pipe 9, the bearings 3 are arranged at two ends of the power rotating pipe 7, the power rotating pipe 7 can rotate relative to the inlet pipe 1 and the outlet pipe 9 through the bearings 3, the sealing devices 2 are arranged at the joints of the two ends of the power rotating pipe 7 and the inlet pipe 1 and the outlet pipe 9 respectively, the sealing devices 2 prevent the fluid flowing through the inlet pipe 1, the power rotating pipe 7 and the outlet pipe 9 from leaking, the cyclone 6 is fixedly and coaxially arranged in the inner cavity of the power rotating pipe 7, the cyclone 6 is tightly connected with the inner wall of the power rotating pipe 7, the pipe body of the power rotating pipe 7 is fixedly connected with the output end of the transmission device 4, the input end of the transmission device 4 is fixedly connected with the motor 5, the rotation of the motor 5 can drive the power rotating pipe 7 to rotate through the transmission device 4, the cyclone 6 can rotate along with the power rotating pipe 7, thereby causing the fluid flowing through the cyclone 6 to rotate, generating centrifugal force; the inner diameters of the inlet pipe 1, the power rotating pipe 7 and the outlet pipe 9 are the same; the outlet pipe 9 is provided with an electromagnetic flow measuring device 8; the distance between the electromagnetic flow measuring device 8 and the end of the cyclone 6 is 2 to 6 times of the pipe diameter.
When a non-full pipe fluid passes through the inlet pipe 1, the fluid is distributed in the inlet pipe 1 as shown in fig. 5, the liquid level height is L, when the fluid rotates through the power rotating pipe 7, the distribution of the fluid flowing through the outlet pipe 9 is shown in fig. 6 due to the centrifugal force, and the annular thickness of the fluid distributed annularly is H.
The electromagnetic flow measuring device 8 has various embodiments, one preferred embodiment of which is shown in fig. 2, and the electromagnetic flow measuring device 8 comprises an electromagnetic flow velocity measuring device 11, a liquid ring thickness measuring device 10 and a first signal processing module 12; the liquid ring thickness measuring device 10 is used for measuring the thickness of a liquid ring and outputting a liquid ring thickness signal H; the electromagnetic flow velocity measuring device 11 measures the average flow velocity of the liquid ring by applying Faraday's law of electromagnetic induction and outputs an average flow velocity signal v; the first signal processing module 12 receives and processes the liquid ring thickness signal and the average flow velocity signal to obtain a flow value Q of the non-full pipe fluid; the liquid ring thickness measuring device 10 can be used for measuring by applying one or a combination of several principles of conductivity method, capacitance method, ray method, ultrasonic method, image processing method, process tomography method and the like.
Another preferred embodiment of the electromagnetic flow measuring device 8 is shown in fig. 3, the electromagnetic flow measuring device 8 includes a composite measuring device 13 and a second signal processing module 14, which are capable of measuring the thickness of the liquid ring and the average flow velocity simultaneously, a plurality of pairs of electrodes 15 are installed at the installation electrodes, while measuring the average flow velocity of the liquid ring by using faraday's law of electromagnetic induction, a multi-way switch group is used to realize the simultaneous measurement of induced electromotive force and fluid electrical impedance, so as to obtain an average flow velocity signal v and a liquid ring thickness signal H, and the average flow velocity signal v and the liquid ring thickness signal H are input into the second signal processing module 14, so as to obtain a flow value Q of the non-full pipe fluid.
In yet another preferred embodiment of the electromagnetic flow measuring device 8, as shown in fig. 4, the electromagnetic flow measuring device 8 includes a composite measuring device 13 and a second signal processing module 14 capable of simultaneously measuring the thickness of the liquid ring and the average flow velocity, a plurality of pairs of capacitive electrodes 16 are installed at the installation electrodes, and when the average flow velocity of the liquid ring is measured by using faraday's law of electromagnetic induction, a multi-way switch set is used to simultaneously measure the induced electromotive force and the fluid capacitive reactance, so as to obtain an average flow velocity signal v and a liquid ring thickness signal H, which are input to the second signal processing module 14, so as to obtain a flow value Q of the non-full pipe fluid.
The embodiment also discloses a method for measuring flow by adopting a non-full pipe flow measuring device, which comprises the following steps:
step 1: the non-full pipe fluid enters the power rotating pipe 7 through the inlet pipe 1;
step 2: the motor 5 outputs power to drive the power rotating pipe 7 to rotate at a high speed through the transmission device 4 and drive the swirler 6 to rotate at a high speed, and the power rotating pipe 7 and the swirler 6 together drive the fluid in the pipe which is not full of pipe to rotate at a high speed to generate centrifugal force;
and step 3: under the action of centrifugal force, the distribution state of a non-full pipe fluid is changed in the power rotating pipe 7, the fluid distribution state with free liquid level height at the inlet pipe 1 is changed into the annular fluid distribution state with liquid ring thickness at the outlet pipe 9, the liquid flow speed is changed from non-axisymmetric distribution into axisymmetric distribution, and the effect of a weight function is equivalent to 1 when the Faraday's law of electromagnetic induction is utilized to measure the average liquid ring flow speed;
and 4, step 4: the electromagnetic flow measuring device 8 measures the liquid ring thickness and the average flow velocity, and calculates the non-full pipe flow using the following formula:
wherein Q is the non-full pipe flow, D is the inner diameter of the measured pipe, H is the liquid ring thickness, and v is the average flow velocity of the fluid;
the average flow velocity v is determined by the following equation:
in the formula, E is induced electromotive force, k is an instrument constant, B is magnetic induction intensity, and C is a liquid ring shape coefficient;
the liquid ring shape coefficient C is determined by the following formula:
wherein f is a constant, and the f can be obtained by calibration.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. The non-full pipe flow measuring device comprises an inlet pipe, an outlet pipe and an electromagnetic flow measuring device, and is characterized by further comprising a power rotating pipe, wherein two ends of the power rotating pipe are rotatably and hermetically connected with the inlet pipe and the outlet pipe respectively through bearings, and the electromagnetic flow measuring device is arranged on the outlet pipe; the inner diameters of the inlet pipe, the outlet pipe and the power rotating pipe are the same; a swirler is coaxially arranged in a tube cavity of the power rotating tube and is tightly connected with the inner wall of the power rotating tube; the transmission device is connected with the motor and the power rotating pipe, and the motor drives the power rotating pipe to rotate; the distance between the cyclone and the electromagnetic flow measuring device is 2 to 6 times of the inner diameter of the power rotating pipe; the electromagnetic flow measuring device comprises an electromagnetic flow velocity measuring device, a liquid ring thickness measuring device and a first signal processing module; the electromagnetic flow velocity measuring device is configured to apply Faraday's law of electromagnetic induction to measure an average flow velocity signal of the fluid in the outlet pipe, the liquid ring thickness measuring device is configured to apply one or a combination of conductivity method, capacitance method, ray method, ultrasonic method, image processing method and process tomography principle to measure a liquid ring thickness signal of the fluid in the outlet pipe, and the first signal processing module is configured to receive and process output signals of the electromagnetic flow velocity measuring device and the liquid ring thickness measuring device to obtain the flow rate of the fluid in the outlet pipe.
2. The non-full pipe flow measurement device of claim 1, wherein the electromagnetic flow measurement device instead comprises a composite measurement device configured to output an average flow rate signal and a liquid ring thickness signal of the fluid in the outlet pipe and a second signal processing module configured to receive and process the output signal of the composite measurement device to derive the flow rate of the fluid in the outlet pipe.
3. The non-full pipe flow measurement apparatus of claim 2, wherein the composite measurement apparatus comprises a plurality of pairs of electrodes and a multi-way switch bank corresponding to the plurality of pairs of electrodes, and wherein the composite measurement apparatus is configured to obtain the average flow rate signal and the liquid ring thickness signal of the fluid in the outlet pipe by simultaneously measuring the induced electromotive force and the fluid electrical impedance through the plurality of pairs of electrodes and the multi-way switch bank using faraday's law of electromagnetic induction.
4. The non-full pipe flow measurement apparatus of claim 2, wherein the composite measurement apparatus comprises a plurality of pairs of capacitive electrodes and a plurality of sets of switches corresponding to the plurality of pairs of capacitive electrodes, and measures induced electromotive force and fluid capacitive reactance simultaneously to obtain the average flow velocity signal and the liquid ring thickness signal of the fluid in the outlet pipe.
5. A method of measuring flow using the non-full pipe flow measurement device of any of claims 1 to 4, comprising the steps of:
step 1: a non-full pipe of fluid enters the power swivel pipe through the inlet pipe;
step 2: the motor outputs power to drive the power rotating pipe to rotate at a high speed through the transmission device and drive the swirler to rotate at a high speed, and the power rotating pipe and the swirler jointly drive the non-full pipe fluid in the pipe to rotate at a high speed to generate centrifugal force;
and step 3: under the action of centrifugal force, the distribution state of the non-full pipe fluid is changed in the power rotating pipe, the fluid distribution state with free liquid level height at the inlet pipe is changed into the annular fluid distribution state with liquid ring thickness at the outlet pipe, the liquid flow speed is changed from non-axisymmetric distribution into axisymmetric distribution, and the action of a weight function is equivalent to 1 when the Faraday's law of electromagnetic induction is used for measuring the average liquid ring flow speed;
and 4, step 4: the electromagnetic flow measuring device measures the thickness and the average flow velocity of the liquid ring, and the non-full pipe flow is calculated by applying the following formula:
wherein Q is the non-full pipe flow, D is the inner diameter of the measured pipe, H is the liquid ring thickness, and v is the average flow velocity of the fluid;
the average flow velocity v is determined by the following equation:
in the formula, E is induced electromotive force, k is an instrument constant, B is magnetic induction intensity, and C is a liquid ring shape coefficient;
the liquid ring shape coefficient C is determined by the following formula:
wherein f is a constant, and is obtained by calibration.
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| JPH05273014A (en) * | 1992-03-26 | 1993-10-22 | Hitachi Ltd | Electromagnetic flowmeter |
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| CN105222831A (en) * | 2015-07-23 | 2016-01-06 | 中国石油大学(华东) | A kind of gas-liquid two-phase flow metering device and method |
| CN107101681A (en) * | 2017-05-19 | 2017-08-29 | 西安交通大学 | Based on the biphase gas and liquid flow flow measurement device and method mutually separated with image procossing |
| CN110174146A (en) * | 2019-05-21 | 2019-08-27 | 长江大学 | The water-oil phase flow measuring apparatus and method of pressure differential method and fluid flowmeter combination are centrifuged based on dynamic rotation |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05273014A (en) * | 1992-03-26 | 1993-10-22 | Hitachi Ltd | Electromagnetic flowmeter |
| CN101454646A (en) * | 2006-04-27 | 2009-06-10 | 恩德斯+豪斯流量技术股份有限公司 | Magnetic inductive sensor |
| CN1928507A (en) * | 2006-07-21 | 2007-03-14 | 上海大学 | Electromagnetic flow sensor for measuring non-full pipe flow and method for measurement |
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| CN105222831A (en) * | 2015-07-23 | 2016-01-06 | 中国石油大学(华东) | A kind of gas-liquid two-phase flow metering device and method |
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