CN110793584A - Multiphase flow mass flow measurement system and measurement method - Google Patents
Multiphase flow mass flow measurement system and measurement method Download PDFInfo
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- CN110793584A CN110793584A CN201911108473.2A CN201911108473A CN110793584A CN 110793584 A CN110793584 A CN 110793584A CN 201911108473 A CN201911108473 A CN 201911108473A CN 110793584 A CN110793584 A CN 110793584A
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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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
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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
- G01F1/05—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 mechanical effects
- G01F1/34—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 mechanical effects by measuring pressure or differential pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
- G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting
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Abstract
The invention discloses a mass flow measuring system for multiphase flow, belonging to the technical field of multiphase flow measurement and solving the problem that the measurement parameters of a mass flow meter cannot be corrected in the measurement of a multiphase flow system in the prior art, wherein the system comprises an upstream area, the device comprises a detection area and a downstream area, wherein the upstream area comprises an inlet connecting piece, the inlet connecting piece is connected with an inlet pipe, an inlet filtering unit and a flow state adjuster are sequentially arranged in the inlet pipe, the flow state adjuster is in a spiral plate shape, a rotary sensor and a flow velocity sensor are arranged on the inlet pipe at the flow state adjuster, the inlet pipe is also connected with a fluid distributor, the detection area comprises an inner cavity and a flow tube which is positioned in the inner cavity and communicated with the fluid distributor, the other end of the flow tube is communicated with an adjusting throttling piece of the downstream area, a plurality of sensors are arranged on the flow tube, and all sensors and drivers on the flow tube. The invention provides a novel idea and a measuring method for realizing multiphase flow fluid measurement.
Description
Technical Field
The invention belongs to the technical field of multiphase flow measurement, and particularly relates to a multiphase flow mass flow measurement system and a measurement method.
Background
The gas-liquid multiphase flow is a fluid of two phases or more than two phases. In the process industry, gas-liquid multiphase flow transport is often involved, for example, wet steam transport, oil separation, oil and gas transportation, etc. in the industry. In order to monitor and manage the production process involving gas-liquid multiphase flow, it is necessary to measure and meter the flow rate of the gas-liquid multiphase flow. Because the common flowmeter can only measure the flow rate of single-phase flow, and gas-liquid multiphase flow is non-single-phase flow, bubble flow, gas mass flow, stratified flow, wavy flow, slug flow, churning flow, annular flow and the like often appear in the flow state of the flowmeter in pipeline flow, the accurate measurement of the flow rate of the gas-liquid multiphase flow is quite difficult.
The existing non-separation measurement technologies include a ray method, a neural network method, a sampling method, a dual-throttling or throttling + velocity measurement method, a mass flow measurement method and the like, and all of the existing non-separation measurement technologies have various technical application limitations, for example, when the mass flow meter is directly used for measuring multiphase flow, an abnormal operation condition occurs, a metering parameter is not corrected, whether the operation is normal or not cannot be determined, and the accuracy of the measurement parameter cannot be determined, so that the measurement result cannot be used.
Disclosure of Invention
The invention aims to:
in order to solve the problem that the measurement parameters of a mass flowmeter cannot be corrected in the measurement of a multiphase flow system in the prior art, a multiphase flow mass flow measurement system and a measurement method are provided.
The technical scheme adopted by the invention is as follows:
a multiphase flow mass flow measurement system comprises an upstream area, a detection area and a downstream area which are sequentially connected, and is characterized in that the upstream area comprises an inlet connecting piece, the inlet connecting piece is connected with an inlet pipe, an inlet filtering unit and a flow state regulator are sequentially arranged in the inlet pipe, the flow state regulator is in a spiral plate shape, a rotation signal detection sensor, a high flow speed detection sensor and a low flow speed detection sensor are arranged on the inlet pipe at the flow state regulator, the inlet pipe is also connected with a fluid distributor, the detection area comprises an inner cavity and a flow pipe which is positioned in the inner cavity and communicated with the fluid distributor, the other end of the flow pipe is communicated with an adjusting throttling piece at the downstream area, a front signal detection sensor, a temperature sensor, a complex frequency driver, a middle signal detection sensor and a rear signal detection sensor are arranged on the flow pipe, all sensors and drivers on the flow tube are electrically connected with a central processing unit.
Furthermore, a filter drain outlet is formed in the inlet filtering unit of the inlet pipe, the fluid distributor and the adjusting throttling piece are both in a conical pipe shape, the inlet pipe is connected with the fluid distributor through an upstream pressure-taking flange and a first connecting flange, and the adjusting throttling piece is connected with an outlet connecting piece through a second connecting flange and a downstream pressure-taking flange.
Furthermore, the upstream pressure-taking flange is connected with an upstream pressure detector, the downstream pressure-taking flange is connected with a downstream pressure detector, an intelligent differential pressure transmitter is connected between the upstream pressure detector and the downstream pressure detector, and the intelligent differential pressure transmitter is electrically connected with the central processing unit.
Further, an inner cavity pressure sensor is installed in the inner cavity and connected with a central processing unit, the central processing unit is installed in the flow computer, the flow computer is connected with the inner cavity through a computer connecting piece, a sensing cable support column is installed in the computer connecting piece, and a sealing section is further connected between the sensing cable support column and the flow computer.
Furthermore, a signal amplification processing unit, an external signal processing unit, an AI chip, a display operation unit and an external communication interface are also installed in the flow computer.
Furthermore, the external communication interface is connected with a chromatograph and a water content instrument.
The central processing unit is responsible for data processing operation, result output and remote transmission communication, the display operation unit comprises a display, an adjusting button, a power key and other display and operation components, the flow computer is externally provided with an explosion-proof shell, and the flow computer is internally provided with a function of inheriting a wireless signal antenna.
The system of the invention can realize real-time on-line oil, gas and water three-phase flow measurement by combining an external communication interface with a wire chromatograph and a water content meter.
The mass flow meter can be used as a throttling element of a differential pressure system, the differential pressure system and the mass flow meter can be self-formed into a system, flow data are respectively measured, data results of the differential pressure system and the mass flow meter are compared through a database, measurement accuracy is improved, and failure of system measurement data is prevented.
A method of mass flow measurement of multiphase flow, comprising the steps of:
detecting a rough measurement flow velocity v 'in an inlet pipe by using a high flow velocity detection sensor and a low flow velocity detection sensor, correcting the rough measurement flow velocity v' value by using a rotation signal detection sensor to obtain an accurate flow velocity v value, calculating and comparing the v value with a signal value fed back by a complex frequency driver by using a central processing unit, determining a vibration amplitude and a frequency value which need to be adjusted, and driving a given self-adaptive driving amplitude and frequency signal;
the amplitude and frequency signal offset of the flow tube are detected by a front signal detection sensor, a middle signal detection sensor and a rear signal detection sensor, the mass flow Qm and the frequency offset are calculated by a central processing unit according to the frequency signal offset, the mixed density rho is calculated, and then the central processing unit analyzes and calculates the air density and the liquid density respectively under the current state according to the temperature signal detected by a temperature sensor and the pressure signal detected by an intelligent differential pressure transmitter;
the AI chip carries out comparison fitting according to pre-imported data and acquired data to form a new flow calculation formula, the acquired data comprises a differential pressure value delta P under the dynamic condition of the intelligent differential pressure transmitter, and the AI chip corrects the mass flow Qm and the mixed density rho according to the delta P value to obtain accurate signal values of Qm and rho, so that the required gas flow value and liquid flow value are calculated.
Further, roughly calculating the flow value of the gas-liquid two-phase flowmeter by the accurate flow velocity v value, and checking the flow value data and the data measured by the mass flowmeter by a system database to prevent the failure of the system measurement data.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention provides a brand new thought and a measurement method for realizing multiphase flow fluid measurement by combining a Coriolis force principle with a throttling type and vortex principle, a traditional mass flowmeter adopts an internal detection mode to adjust a driving signal, and the system works abnormally or even stops working due to the stress effect and density difference when two-phase flow fluid and fluid are measured suddenly, but the invention innovatively provides an external broadband signal to provide a relatively accurate and reliable flow rate signal, and an innovative complex frequency driver can enable the system to accurately and efficiently provide the driving signal when the system is used for dealing with the multiphase flow fluid and the fluid sudden change, so that the system can deal with the free normal operation in the whole-range change process of GVF 0-100%.
2. The system of the invention introduces an intelligent AI chip, adopts a neural grid system unit and an intelligent differential pressure transmitter, and automatically adjusts and adapts to driving parameters according to the working condition change, thereby measuring an accurate mass flow signal Qm and a mixed fluid density signal rho and ensuring the measurement accuracy of the whole system.
3. The measuring tube of the mass flowmeter is equivalent to a throttling device, and when the measuring range of the selected intelligent differential pressure transmitter is not matched due to the change of a pressure system, the accuracy of measurement can be realized by replacing the adjusting throttling element in the downstream area.
4. The system of the invention adopts an open operation system and closed loop self-learning, can exchange data with external equipment such as an online component chromatograph, a water content analyzer and the like on the premise of ensuring the safe and reliable operation of the system, can dynamically correct basic parameters participating in calculation, and can complete remote diagnosis, system upgrade and other work in a wireless communication mode.
5. The built-in inner cavity pressure sensor can finish the correction of detection data with the temperature sensor at the same time, can monitor dangerous situations such as the puncture of the measuring tube in the cavity, the damage of the measuring tube and the like in real time, and can monitor the inner cavity pressure at the same time, thereby ensuring the normal work of the mass flow meter and preventing safety accidents.
6. The system can be normally used when being installed horizontally and vertically, and the computer system can adopt an integrated design or a split design, thereby meeting the use requirements of different owners.
7. According to the invention, a differential pressure signal and a pressure signal detected by the intelligent differential pressure transmitter are combined with a flow signal obtained by roughly calculating the flow speed and the temperature detected by the speed sensor and the temperature sensor, and are analyzed and compared with a mass flow data result detected by the mass flow meter, so that the self-checking of a measurement system is realized.
Drawings
FIG. 1 is a block diagram of a measurement system of the present invention;
fig. 2 is a partial view of the fluid regulator of fig. 1.
The labels in the figure are: 1-inlet filtering unit, 2-flow state regulator, 3-rotation signal detecting sensor, 4-high flow rate detecting sensor, 5-low flow rate detecting sensor, 6-fluid distributor, 7-upstream pressure measuring device, 8-front signal detecting sensor, 9-temperature sensor, 10-complex frequency driver, 11-middle signal detecting sensor, 12-rear signal detecting sensor, 13-inner cavity pressure sensor, 14-regulating throttle, 15-downstream pressure measuring device, 16-intelligent differential pressure transmitter, 17-signal amplifying processing unit, 18-external signal processing unit, 19-central processing unit, 20-AI chip, 21-display operation unit, 22-flow rate computer, 23-inlet connecting piece, 24-a filter sewage outlet, 25-an upstream pressure-taking flange, 26-a first connecting flange, 27-a second connecting flange, 28-a downstream pressure-taking flange, 29-an outlet connecting piece, 30-a sensing cable support, 31-a computer connecting piece and 32-an external communication interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A multiphase flow mass flow measurement system comprises an upstream area, a detection area and a downstream area which are connected in sequence, and is characterized in that the upstream area comprises an inlet connecting piece 23, the inlet connecting piece 23 is connected with an inlet pipe, an inlet filtering unit 1 and a flow state adjuster 2 are sequentially arranged in the inlet pipe, the flow state adjuster 2 is in a spiral plate shape, a rotation signal detection sensor 3, a high flow speed detection sensor 4 and a low flow speed detection sensor 5 are arranged on the inlet pipe at the position of the flow state adjuster 2, the inlet pipe is also connected with a fluid distributor 6, the detection area comprises an inner cavity and a flow pipe which is positioned in the inner cavity and communicated with the fluid distributor 6, the other end of the flow pipe is communicated with an adjusting throttle piece 14 of the downstream area, a front signal detection sensor 8, a temperature sensor 9, a multi-frequency driver 10, a middle signal detection sensor 11 and a rear signal detection, all sensors and drivers on the flow tube are electrically connected to a central processor 19.
Example 2
On the basis of the embodiment 1, a filter sewage outlet 24 is arranged at the inlet of the inlet filtering unit 1 of the inlet pipe, the fluid distributor 6 and the adjusting throttling piece 14 are both in a conical pipe shape, the inlet pipe is connected with the fluid distributor 6 through an upstream pressure taking flange 25 and a first connecting flange 26, and the adjusting throttling piece 14 is connected with an outlet connecting piece 29 through a second connecting flange 27 and a downstream pressure taking flange 28.
Example 3
On the basis of embodiment 1, the upstream pressure measuring flange 25 is connected with the upstream pressure measuring device 7, the downstream pressure measuring flange 28 is connected with the downstream pressure measuring device 15, the intelligent differential pressure transmitter 16 is connected between the upstream pressure measuring device 7 and the downstream pressure measuring device 15, and the intelligent differential pressure transmitter 16 is electrically connected with the central processing unit 19.
Example 4
On the basis of embodiment 1, an inner cavity pressure sensor 13 is installed in the inner cavity, the inner cavity pressure sensor 13 is connected with a central processing unit 19, the central processing unit 19 is installed in a flow computer 22, the flow computer 22 is connected with the inner cavity through a computer connecting piece 31, a sensing cable support 30 is installed in the computer connecting piece 31, and a sealing section is further connected between the sensing cable support 30 and the flow computer 22.
Example 5
In addition to embodiment 1, the flow computer 22 is also internally provided with a signal amplification processing unit 17, an external signal processing unit 18, an AI chip 20, a display operation unit 21, and an external communication interface 32, and the external communication interface 32 is connected with a chromatograph and a moisture meter.
Example 6
A method of mass flow measurement of multiphase flow, comprising the steps of:
detecting a rough measurement flow velocity v 'in an inlet pipe by using a high flow velocity detection sensor 4 and a low flow velocity detection sensor 5, correcting the rough measurement flow velocity v' value by using a rotation signal detection sensor 3 to obtain an accurate flow velocity v value, calculating and comparing the v value with a signal value fed back by a complex frequency driver 10 by using a central processing unit 19, determining a vibration amplitude and a frequency value which need to be adjusted, and driving a given self-adaptive driving amplitude and frequency signal;
the amplitude and frequency signal offset of the flow tube are detected by a front signal detection sensor 8, a middle signal detection sensor 11 and a rear signal detection sensor 12, the mass flow Qm and the frequency offset are calculated by a central processing unit 19 according to the frequency signal offset, the mixed density rho is calculated, and then the central processing unit 19 analyzes and calculates the air density and the liquid density respectively under the current state according to the temperature signal detected by a temperature sensor 9 and the pressure signal detected by an intelligent differential pressure transmitter 16;
the AI chip 20 performs a comparison fitting according to the pre-imported data and the collected data to form a new flow calculation formula, the collected data includes a differential pressure value delta P under the dynamic condition of the intelligent differential pressure transmitter 16, and the AI chip 20 corrects the mass flow Qm and the mixed density rho according to the delta P value to obtain accurate signal values of Qm and rho, thereby calculating the required gas flow value and liquid flow value.
Example 7
On the basis of example 6, the flow rate value of the gas-liquid two-phase flowmeter was roughly calculated from the accurate flow rate v value, and the flow rate value data was checked against the data measured by the mass flowmeter, thereby preventing the system measurement data from being invalid.
The working process of the measuring system of the invention is as follows:
the fluid enters the inlet pipe of the upstream area from the inlet connecting piece 23, is filtered by the inlet filtering unit 1, the impurity cup in the fluid is filtered and is discharged from the sewage outlet 24 of the filter, the filtered fluid is adjusted to flow along a spiral path by the flow state adjuster 2, data collection is carried out by the rotary signal detection sensor 3, the high flow rate detection sensor 4 and the low flow rate detection sensor 5, the pressure is measured by the upstream pressure measuring device 7 when the filtered fluid passes through the upstream pressure measuring flange 25, then the filtered fluid is homogenized and rectified by the fluid distributor 6, enters the flow pipe of the detection area, data detection is carried out by the front signal detection sensor 8, the temperature sensor 9, the complex frequency driver 10, the middle signal detection sensor 11 and the rear signal detection sensor 12 respectively, then enters the adjusting throttling piece 14 of the downstream area, the pressure is measured by the downstream pressure measuring device 15, and is discharged from the outlet connecting piece 29, the upstream and downstream pressure data are analyzed and integrated by the intelligent differential pressure transmitter 16 and fed back to the central processor 19 of the flow computer 22 together with all other data, wherein each sensor of the detection area is driven by the complex frequency driver 10, and an accurate and efficient driving signal is provided when the fluid suddenly changes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The multiphase flow mass flow measurement system comprises an upstream area, a detection area and a downstream area which are sequentially connected, and is characterized in that the upstream area comprises an inlet connecting piece (23), the inlet connecting piece (23) is connected with an inlet pipe, an inlet filtering unit (1) and a flow state regulator (2) are sequentially arranged in the inlet pipe, the flow state regulator (2) is in a spiral plate shape, a rotation signal detection sensor (3), a high-flow-rate detection sensor (4) and a low-flow-rate detection sensor (5) are arranged on the inlet pipe at the position of the flow state regulator (2), the inlet pipe is also connected with a fluid distributor (6), the detection area comprises an inner cavity and a flow pipe which is positioned in the inner cavity and communicated with the fluid distributor (6), the other end of the flow pipe is communicated with an adjusting throttling piece (14) at the downstream area, and a front signal detection sensor (8) and a flow pipe are, The flow tube comprises a temperature sensor (9), a multi-frequency driver (10), a middle signal detection sensor (11) and a rear signal detection sensor (12), wherein all the sensors and the drivers on the flow tube are electrically connected with a central processing unit (19).
2. The multiphase flow mass flow measurement system of claim 1, wherein a filter drain (24) is formed at an inlet of the inlet pipe and the filter unit (1), the fluid distributor (6) and the adjusting throttling element (14) are both in a conical pipe shape, the inlet pipe is connected with the fluid distributor (6) through an upstream pressure taking flange (25) and a first connecting flange (26), and the adjusting throttling element (14) is connected with an outlet connecting element (29) through a second connecting flange (27) and a downstream pressure taking flange (28).
3. The multiphase flow mass flow measurement system of claim 2, wherein the upstream pressure measuring flange (25) is connected with an upstream pressure measuring device (7), the downstream pressure measuring flange (28) is connected with a downstream pressure measuring device (15), an intelligent differential pressure transmitter (16) is connected between the upstream pressure measuring device (7) and the downstream pressure measuring device (15), and the intelligent differential pressure transmitter (16) is electrically connected with the central processing unit (19).
4. The multiphase flow mass flow measurement system of claim 1, wherein the inner cavity is internally provided with an inner cavity pressure sensor (13), the inner cavity pressure sensor (13) is connected with a central processing unit (19), the central processing unit (19) is arranged in a flow computer (22), the flow computer (22) is connected with the inner cavity through a computer connecting piece (31), a sensing cable support (30) is arranged in the computer connecting piece (31), and a sealing section is connected between the sensing cable support (30) and the flow computer (22).
5. The multiphase flow mass flow measurement system of claim 4, wherein the flow computer (22) is further internally provided with a signal amplification processing unit (17), an external signal processing unit (18), an AI chip (20), a display operation unit (21) and an external communication interface (32).
6. A multiphase flow mass flow measurement system according to claim 5, wherein the external communication interface (32) is connected to a chromatograph and a moisture meter.
7. A method of mass flow measurement of multiphase flow, comprising the steps of:
detecting a rough measurement flow velocity v 'in an inlet pipe by using a high flow velocity detection sensor (4) and a low flow velocity detection sensor (5), correcting the rough measurement flow velocity v' value by using a rotation signal detection sensor (3) to obtain an accurate flow velocity v value, calculating and comparing the v value with a signal value fed back by a complex frequency driver (10) by using a central processing unit (19), determining a vibration amplitude and a frequency value which need to be adjusted, and driving a given self-adaptive driving amplitude and frequency signal;
the amplitude and frequency signal offset of the flow tube are detected by a front signal detection sensor (8), a middle signal detection sensor (11) and a rear signal detection sensor (12), the mass flow Qm and the frequency offset are calculated by a central processing unit (19) according to the frequency signal offset, the mixed density rho is calculated, and then the central processing unit (19) analyzes and calculates the air density and the liquid density respectively under the current state according to the temperature signal detected by a temperature sensor (9) and the pressure signal detected by an intelligent differential pressure transmitter (16);
the AI chip (20) performs comparison fitting according to pre-imported data and acquired data to form a new flow calculation formula, the acquired data comprises a differential pressure value delta P under the dynamic condition of the intelligent differential pressure transmitter (16), and the AI chip (20) corrects the mass flow Qm and the mixing density rho according to the delta P value to obtain accurate signal values of Qm and rho, so as to calculate a required gas flow value and a required liquid flow value.
8. A multiphase flow mass flow measurement method according to claim 7, wherein the flow value of the gas-liquid two-phase flowmeter is roughly calculated from the accurate flow velocity v value, and the flow value data and the data measured by the mass flowmeter are checked by a system database to prevent the system measurement data from being invalid.
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| CN111238996A (en) * | 2020-03-04 | 2020-06-05 | 西京学院 | Multiphase fluid density measurement system and measurement method |
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| CN111238996A (en) * | 2020-03-04 | 2020-06-05 | 西京学院 | Multiphase fluid density measurement system and measurement method |
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