CN108225729B - Accurate regulation gas-liquid two-phase flow experiment table - Google Patents
Accurate regulation gas-liquid two-phase flow experiment table Download PDFInfo
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- CN108225729B CN108225729B CN201810272090.8A CN201810272090A CN108225729B CN 108225729 B CN108225729 B CN 108225729B CN 201810272090 A CN201810272090 A CN 201810272090A CN 108225729 B CN108225729 B CN 108225729B
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- 239000007788 liquid Substances 0.000 title claims abstract description 81
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 23
- 238000002474 experimental method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 230000001105 regulatory effect Effects 0.000 claims abstract description 25
- 230000009194 climbing Effects 0.000 claims abstract description 21
- 239000012071 phase Substances 0.000 claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 11
- 238000007872 degassing Methods 0.000 claims abstract description 11
- 239000007791 liquid phase Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims description 25
- 239000000523 sample Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000010992 reflux Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
A precision adjustment gas-liquid two-phase flow experiment table comprises a gas phase generating assembly and a liquid phase generating assembly which are respectively connected with a gas-liquid mixer; the gas phase generating assembly comprises an air compressor, a gas buffer tank, a Y-type filter and a gas-liquid ratio regulating and controlling module which are sequentially connected with the air compressor; the liquid phase generating assembly comprises a water tank, a degassing filter and a liquid regulation parallel branch which are sequentially connected with the water tank through a centrifugal pump; the gas-liquid mixer is connected with an experimental pipeline through a homogenizer, the gas-liquid two-phase mixture flowing out of the experimental pipeline discharges a gas phase to the atmosphere through a cyclone separator, and the liquid phase returns to the water tank; the experimental pipeline comprises a plurality of loops formed by connecting a horizontal pipeline, a vertical pipeline, an inclined climbing pipeline and an inclined descending pipeline, and a gas-liquid two-phase flow capturing and shooting device arranged on each loop. According to the invention, the PLC is used for collecting the test data in real time, so that the gas-liquid ratio can be accurately controlled.
Description
Technical Field
The invention relates to the field of oil and gas storage and transportation, in particular to a precision-adjusting gas-liquid two-phase flow experiment table.
Background
The gas-liquid two-phase flow is widely used in various industrial fields such as petroleum, chemical industry, metallurgy and the like, and parameters describing the characteristics of the gas-liquid two-phase flow include flow pattern, flow rate, split-phase content and the like, so that various parameters reflecting the characteristics of a two-phase flow system can be effectively detected in real time, and the method has important significance for ensuring the control and operation reliability of the system. Mixed transportation loops are commonly used at home and abroad for analysis and research.
The defects existing in the existing experiment table are mainly expressed in the following aspects:
(1) The experimental loop has simple structure;
(2) The visual inspection method has great subjectivity in identifying the flow pattern, and the slight flow pattern change is difficult to capture in the experimental process;
(3) The regulation and control of the gas-liquid ratio are inaccurate;
(4) The pressure fluctuation in the gas-liquid mixer is severe, the metering precision is affected, and the vibration of the pipeline is aggravated.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a precise gas-liquid two-phase flow regulation experiment table which can simulate actual working conditions, realize precise control of gas-liquid ratio, acquire test data in real time and has better anti-interference capability.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
comprises a gas phase generating component and a liquid phase generating component which are respectively connected with a gas-liquid mixer; the gas phase generating assembly comprises an air compressor, a gas buffer tank, a Y-shaped filter and a gas-liquid ratio regulating module which are sequentially connected with the air compressor, wherein the gas-liquid ratio regulating module comprises a gas regulating branch provided with a gas precise regulating valve and a metal tube float flowmeter; the liquid phase generating assembly comprises a water tank, a degassing filter and a liquid regulation parallel branch which are sequentially connected with the water tank through a centrifugal pump, and a liquid control valve and a mass flowmeter are arranged on the liquid regulation parallel branch; the gas-liquid mixer is connected with an experimental pipeline through a homogenizer, the gas-liquid two-phase mixture flowing out of the experimental pipeline discharges a gas phase to the atmosphere through a cyclone separator, and the liquid phase returns to the water tank;
the experimental pipeline comprises a plurality of loops formed by connecting a horizontal pipeline, a vertical pipeline, an inclined climbing pipeline and an inclined descending pipeline, and a gas-liquid two-phase flow capturing and shooting device arranged on each loop;
the inlet and outlet of the experimental pipeline are respectively provided with a group of pressure transmitters and temperature transmitters, the pipelines at the two ends of the gas-liquid ratio regulating and controlling module are respectively provided with a group of pressure transmitters and temperature transmitters, the inlet pipeline of the liquid regulating and controlling parallel branch is provided with a pressure transmitter and a temperature transmitter, and the branch of each loop of the experimental pipeline is provided with a pressure transmitter; the mass flowmeter, the metal tube float flowmeter and all the pressure transmitters and the temperature transmitters are connected with the PLC.
The experimental pipeline is arranged on the steel structure pipe rack, the gas-liquid two-phase flow capturing and shooting device comprises a transparent pipe body connected with the pipeline and a conductive probe arranged in the transparent pipe body, and a high-speed camera is arranged outside the transparent pipe body.
The gas-liquid two-phase flow capturing and shooting device comprises an LED light source for assisting the high-speed camera to shoot the transparent pipe body.
The water tank is connected with a reflux pipe with a reflux valve, and the reflux valve is connected with a pipeline between the centrifugal pump and the degassing filter.
The two gas regulating and controlling branches are connected in parallel and are connected in parallel with a pipeline with a valve independently; the liquid regulation parallel branch comprises three branches which are arranged in parallel, each branch is provided with a mass flowmeter, the pipelines at the two ends of the mass flowmeter are respectively provided with a liquid control valve, and the three liquid regulation parallel branches are connected with the pipelines with the valves independently in parallel.
The water tank is internally provided with a steady flow grid, the side surface of the water tank is provided with a glass tube liquid level meter, and the bottom of the water tank is provided with a drain valve.
The experimental pipeline comprises a first loop formed by connecting a horizontal pipeline with a vertical pipeline, the horizontal pipeline is connected with a first inclined climbing pipeline and a first inclined descending pipeline through a metal hose to form a second loop, the first inclined climbing pipeline is connected with a second inclined climbing pipeline in parallel through the metal hose, the second inclined climbing pipeline is connected with the second inclined descending pipeline, the second inclined descending pipeline is connected with the first inclined descending pipeline in parallel through the metal hose, and the second inclined climbing pipeline is connected with the second inclined descending pipeline to form a third loop.
Compared with the prior art, the invention has the following beneficial effects: the experimental pipeline is arranged between the homogenizer and the cyclone separator, the homogenizer is connected with the gas-liquid mixer, compressed air from the air compressor in the gas phase generating assembly is stabilized by the gas buffer tank and filtered by the Y-shaped filter, then the compressed air enters the gas-liquid mixer after being metered and controlled by the gas-liquid ratio regulating and controlling module, water from the water tank in the liquid phase generating assembly is pressurized by the centrifugal pump and degassed and purified by the degassing filter, then enters the gas-liquid mixer after being metered and controlled by the liquid regulating and controlling parallel branch, the gas-liquid two-phase flow enters the homogenizer for mixing again after being primarily mixed in the gas-liquid mixer, the fully and uniformly mixed gas-liquid mixture enters the experimental pipeline, and the experimental pipeline is composed of a horizontal section with different pipe diameters, a vertical section and an inclined section with an adjustable inclination angle, and is tightly attached to the actual working condition. The cyclone separator and the degassing filter perform two-stage separation on the gas-liquid mixture, the gas-liquid ratio is strictly regulated and controlled through the precise regulating valve, and the capture and shooting device can record the flow pattern and synchronously acquire data in real time. According to the invention, the dynamic and static two-stage uniform mixing of the gas-liquid medium can effectively inhibit the influence of pressure pulsation on the measuring instrument and the experimental pipeline, the test data is accurate, and the operation is convenient.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the experimental pipeline of the present invention;
FIG. 3 is a schematic block diagram of a control system of the present invention;
in the accompanying drawings: 1-a cyclone separator; 2-a water tank; 3-a steady flow grid; 4-a centrifugal pump; 5-an air compressor; 6-a gas buffer tank; 7-a gas-liquid mixer; 8-a homogenizer; 9-an experiment pipeline; 10-a water suction pipe; 11-a return pipe; 12-a drain pipe; 13-a gas buffer tank exhaust pipe; 14-an exhaust pipe of the air compressor; 15-a return valve; 16-a first valve; 17-a second valve; 18-a third valve; 19-a degassing filter; 20-fourth valve; 21-a fifth valve; 22-sixth valve; 23-seventh valve; a 24-Y filter; 25-eighth valve; 26-ninth valve; 27-a mass flowmeter; 28-tenth valve; 29-eleventh valve; 30-metal tube float flowmeter; 31-a gas precision regulating valve; 32-twelfth valve; 33-thirteenth valve; 34-fourteenth valve; 35-fifteenth valve; 36-sixteenth valve; 37-drain valve; 38-a blow-down valve; 39-seventeenth valve; 40-horizontal pipeline; 41-vertical pipeline; 42-a first inclined climbing pipeline; 43-a first inclined descent line; 44-a second inclined climbing pipeline; 45-a second inclined drop line; 46-a transparent tube; 47-metal hose; 48-high speed camera; 49-LED light source; 50-conductivity probe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the present invention structurally includes an air compressor 5, a gas buffer tank 6, a gas-liquid mixer 7, a homogenizer 8, a water tank 2, a cyclone 1, a centrifugal pump 4, and an experimental line 9.
The air compressor 5 is connected with the inlet of the gas buffer tank 6 through the air compressor exhaust pipe 14, and the fifth valve 21, the sixth valve 22 and the air release valve 38 are arranged on the air compressor exhaust pipe 14. One end of the gas buffer tank exhaust pipe 13 is connected to the outlet of the gas buffer tank 6, and the other end of the gas buffer tank exhaust pipe 13 is connected to one end of the metal pipe float flowmeter 30.
A seventh valve 23 and a Y-filter 24 are provided in the gas buffer tank exhaust pipe 13.
The metal tube float flowmeter 30 is located between the eleventh valve 29 and the gas precision regulating valve 31, the metal tube float flowmeter 30 is connected with a twelfth valve 32 in parallel, the other end of the metal tube float flowmeter 30 is connected with the gas-liquid mixer 7, and a thirteenth valve 33 and a fourteenth valve 34 are arranged between the metal tube float flowmeter 30 and the gas-liquid mixer 7.
The water tank 2 is internally provided with a steady flow grid 3, the side surface of the water tank is provided with a glass tube liquid level meter, and a drain valve 37 is arranged.
The outlet of the water tank 2 is connected with the inlet of the centrifugal pump 4 through a water suction pipe 10, and a first valve 16 is arranged on the water suction pipe 10. The outlet of the centrifugal pump 4 is connected with one end of the drain pipe 12, and a third valve 18, a second valve 17, a degassing filter 19 and a fourth valve 20 are sequentially arranged on the drain pipe 12. A return pipe 11 is arranged between the drain pipe 12 and the water tank 2, one end of the return pipe 11 is positioned between the second valve 17 and the degassing filter 19, the other end of the return pipe 11 is connected with the water tank 2, the other end of the drain pipe 12 is connected with one end of a mass flowmeter 27, the mass flowmeter 27 is positioned between the ninth valve 26 and the tenth valve 28, the mass flowmeter 27 is connected with an eighth valve 25 in parallel, and the other end of the mass flowmeter 27 is connected with the gas-liquid mixer 7.
The outlet of the gas-liquid mixer 7 is connected with the inlet of the homogenizer 8, the outlet of the homogenizer 8 is connected with one end of the experiment pipeline 9, and a seventeenth valve 39 and a fifteenth valve 35 are arranged between the homogenizer 8 and the experiment pipeline 9.
The other end of the experimental pipeline 9 is connected with the connecting cyclone separator 1.
The compressed air from the air compressor 5 is stabilized by the gas buffer tank 6, filtered by the Y-shaped filter 24 and metered by the metal tube float flowmeter 30 and then enters the gas-liquid mixer 7; the water from the water tank 2 is pressurized by the centrifugal pump 4, degassed and purified by the degassing filter 19, and then metered by the mass flowmeter 27, and enters the mixer 7. By controlling the opening of the regulating valve, different flow ranges and different phase contents are proportioned; the gas phase and the water phase are mixed for the first time in the gas-liquid mixer 7 and then enter the homogenizer 8 for mixing again, the gas-liquid mixture which is mixed fully and uniformly enters the experiment pipeline 9, the gas-liquid mixture which flows out of the experiment pipeline 9 is separated by the cyclone separator 1, the gas phase is discharged into the atmosphere, and the water phase returns to the water tank for reuse. The reflux valve 15 on the reflux pipe 11 can perform preliminary adjustment on the flow of liquid phase, and can eliminate the influence of pressure fluctuation of the downstream experimental pipeline 9 on gas metering by increasing the gas source pressure before entering the metal pipe float flowmeter 30, namely increasing the pressure difference of two ends of a float in the metal pipe float flowmeter 30.
The air compressor 5 and the centrifugal pump 4 of the invention both adopt variable frequency speed regulation.
Referring to fig. 2, the experimental pipeline 9 of the present invention includes a horizontal pipeline 40, a first inclined climbing pipeline 42, a first inclined descending pipeline 43, a second inclined climbing pipeline 44, a second inclined descending pipeline 45, a vertical pipeline 41, a transparent pipe 46, a metal hose 47, a high-speed camera 48, and an LED light source 49. The horizontal pipeline 40 and the vertical pipeline 41 are connected to form a first loop; the horizontal pipeline 40, the first inclined climbing pipeline 42 and the first inclined descending pipeline 43 are connected through a metal hose 47 to form a second loop; the first inclined climbing pipeline 42 and the second inclined climbing pipeline 44 are connected through a metal hose 47, the first inclined descending pipeline 43 and the second inclined descending pipeline 45 are connected through the metal hose 47, and the second inclined climbing pipeline 44 and the second inclined descending pipeline 45 form a third loop; the flow switching is carried out among the three loops through a cut-off valve.
Specifically, the three loops included in the experimental pipeline 9 are seamless steel pipes, and are provided with organic glass pipes with the length of 2m as transparent pipes 46 for flow pattern observation, grooves are formed in the transparent pipes 46 and used for embedding annular conductivity probes 50, the annular conductivity probes 50 are used for measuring the average liquid holdup of the cross section and the distribution of the cross section, and the experimental pipeline 9 and the transparent pipes 46 are connected in a flange sealing manner; the LED light source 49 is used to provide an auxiliary light source, and the high-speed camera 48 performs simultaneous backlighting of the two-phase flow in the transparent tube 46, so as to clearly capture the gas-liquid two-phase flow in various states. The first loop adopts DN80 pipeline and takes L-shaped structure; the second loop adopts DN50 pipeline, the third loop adopts DN25 pipeline, the second loop and the third loop are both U-shaped structure, the inlet and outlet of the second loop and the third loop are both flexible connection of metal hose, and the inclination angle is adjusted up and down by taking the flexible connection as fulcrum.
Referring to fig. 1, a set of pressure and temperature transmitters are provided at the inlet and outlet of the gas regulating branch, the pressure and temperature transmitters at the inlet are located between the Y-filter 24 and the eleventh valve 29, and the pressure and temperature transmitters at the outlet are located between the gas fine regulating valve 31 and the thirteenth valve 33. The inlet of the liquid regulation parallel branch is provided with a group of pressure and temperature transmitters, and the pressure and temperature transmitters are positioned between the fourth valve 20 and the ninth valve 26; a group of pressure and temperature transmitters are respectively arranged at the inlet and the outlet of the experimental pipeline 9 and are positioned between the fifteenth valve 35 and the sixteenth valve 36;
referring to fig. 2, 2 pressure transmitters are arranged between each cut-off valve of the experimental loop 9. The real-time monitoring system consists of a pressure, temperature, flow transmitter, a data acquisition card, a signal acquisition box, a host, a control cabinet, a high-speed camera and an LED light source, wherein all measurement signals are standard 4-20 mA signals, the signals are transmitted into the data acquisition box for acquisition by a computer, a voltage-current conversion circuit and a 24V direct current power supply are arranged in the signal acquisition box, the pressure and flow transmitter can be powered, the 4-20 mA current signals of the transmitter are converted into 1-5V voltage signals for acquisition by the computer, and the running state of the experiment table is monitored in real time through configuration software.
Claims (5)
1. A precision adjustment gas-liquid two-phase flow experiment table is characterized in that: comprises a gas phase generating component and a liquid phase generating component which are respectively connected with a gas-liquid mixer (7); the gas phase generating assembly comprises an air compressor (5), a gas buffer tank (6), a Y-shaped filter (24) and a gas-liquid ratio regulating module which are sequentially connected with the air compressor (5), wherein the gas-liquid ratio regulating module comprises a gas regulating branch provided with a gas precise regulating valve (31) and a metal pipe float flowmeter (30); the liquid phase generating assembly comprises a water tank (2), a degassing filter (19) and a liquid regulation parallel branch which are sequentially connected with the water tank (2) through a centrifugal pump (4), and a liquid control valve and a mass flowmeter (27) are arranged on the liquid regulation parallel branch; the gas-liquid mixer (7) is connected with an experiment pipeline (9) through a homogenizer (8), the gas-liquid two-phase mixture flowing out of the experiment pipeline (9) is discharged to the atmosphere through a cyclone separator (1), and the liquid phase returns to the water tank (2); the experimental pipeline (9) comprises a plurality of loops formed by connecting a horizontal pipeline (40), a vertical pipeline (41), an inclined climbing pipeline and an inclined descending pipeline, and a gas-liquid two-phase flow capturing and shooting device arranged on each loop; the inlet and outlet of the experimental pipeline (9) are respectively provided with a group of pressure transmitters and temperature transmitters, the pipelines at the two ends of the gas-liquid ratio regulating and controlling module are respectively provided with a group of pressure transmitters and temperature transmitters, the inlet pipeline of the liquid regulating and controlling parallel branch is provided with a pressure transmitter and a temperature transmitter, and the branch of each loop of the experimental pipeline (9) is provided with a pressure transmitter; the mass flowmeter (27) and the metal tube float flowmeter (30) are connected with the PLC controller through all pressure transmitters and temperature transmitters;
the two gas regulating and controlling branches are connected in parallel, and the two gas regulating and controlling branches are connected in parallel with a pipeline with a valve independently; the liquid regulation parallel branch comprises three branches which are arranged in parallel, each branch is provided with a mass flowmeter (27), the pipelines at the two ends of the mass flowmeter (27) are respectively provided with a liquid control valve, and the three liquid regulation parallel branches are connected in parallel with the pipelines with the valves independently;
the experimental pipeline (9) comprises a first loop formed by connecting a horizontal pipeline (40) with a vertical pipeline (41), the horizontal pipeline (40) is connected with a first inclined climbing pipeline (42) and a first inclined descending pipeline (43) through a metal hose (47) to form a second loop, the first inclined climbing pipeline (42) is connected with a second inclined climbing pipeline (44) in parallel through the metal hose (47), the second inclined climbing pipeline (44) is connected with a second inclined descending pipeline (45), the second inclined descending pipeline (45) is connected with the first inclined descending pipeline (43) in parallel through the metal hose (47), and the second inclined climbing pipeline (44) is connected with the second inclined descending pipeline (45) to form a third loop.
2. The precision-adjusting gas-liquid two-phase flow experiment table according to claim 1, wherein: the experimental pipeline (9) is arranged on the steel structure pipe support, the gas-liquid two-phase flow capturing and shooting device comprises a transparent pipe body (46) connected with the pipeline and a conductance probe (50) arranged in the transparent pipe body (46), and a high-speed camera (48) is arranged outside the transparent pipe body (46).
3. The precision-adjusting gas-liquid two-phase flow experiment table according to claim 2, wherein: the gas-liquid two-phase flow capturing and shooting device comprises an LED light source (49) for assisting a high-speed camera (48) to shoot a transparent pipe body (46).
4. The precision-adjusting gas-liquid two-phase flow experiment table according to claim 1, wherein: the water tank (2) is connected with a return pipe (11) with a return valve (15), and the return valve (15) is connected with a pipeline between the centrifugal pump (4) and the degassing filter (19).
5. The precision-adjusting gas-liquid two-phase flow experiment table according to claim 1, wherein: the water tank (2) is internally provided with a steady flow grid (3), the side surface of the water tank (2) is provided with a glass tube liquid level meter, and the bottom of the water tank (2) is provided with a drain valve (37).
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| CN109946041A (en) * | 2019-04-11 | 2019-06-28 | 燕山大学 | A kind of flow-field visualized property test platform of biphase gas and liquid flow and test method |
| CN111912743A (en) * | 2020-07-10 | 2020-11-10 | 中国石油大学胜利学院 | Gas-liquid two-phase jet flow oil pipe outer surface cleaning experimental device and method |
| CN112362297B (en) * | 2020-10-19 | 2023-11-28 | 中国科学院合肥物质科学研究院 | Divertor purging test loop data acquisition system and method |
| CN112730213B8 (en) * | 2020-11-30 | 2022-09-30 | 合肥工业大学 | Gas-liquid accurate proportioning test device and test method under normal temperature and negative pressure |
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