CN101178347B - Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system - Google Patents
Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system Download PDFInfo
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- CN101178347B CN101178347B CN200710150184XA CN200710150184A CN101178347B CN 101178347 B CN101178347 B CN 101178347B CN 200710150184X A CN200710150184X A CN 200710150184XA CN 200710150184 A CN200710150184 A CN 200710150184A CN 101178347 B CN101178347 B CN 101178347B
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Abstract
The invention pertains to the technical field of fluid measurement, which relates to a slit Venturi throttle device, including an entrance, a contraction section, a slit section, an expansion section and an exit which are connected sequentially, the contraction section is a section of long narrow pipeline, the cross-section of the contraction section takes a shape of a long narrow rectangle, and the area of the cross section thereof is smaller than the area of the cross sections of the entrance and the exit. The invention also provides a two-phase flow measurement system which adopts the throttle device. The Venturi throttle device and the two-phase flow measurement system which are provided by the invention can effectively eliminate the influence of the friction pressure drop on the measurement, the devices can be applicable to the different gas-liquid two-phase media, different pipeline materials and other working conditions, and the factors which are related with the friction force and affect the measurement can be reduced or eliminated. The invention makes use of the gravity potential pressure difference pulse signals and the time equalization signals which are perpendicular to the horizontal flow direction, at the same time, the invention can avoid the influence of the frictional resistance and accurately identify the flow type and measure the fraction rate, furthermore, the implementation is simple and convenient.
Description
Technical field
The invention belongs to the flow measurement technology field, relate to a kind of two-phase flow phase content and Flow Measuring System.
Background technology
Two-phase flow is meant the flow system that two-phase material (at least one is fluid mutually) is formed.If the phase of material then is called polyphasic flow more than two in the flow system, two-phase or multiphase stream is for finishing phase transformation mass transfer and course of reaction the most general related viscous fluid flow in the Chemical Manufacture.Chemical reaction processes in heat transfer when phase transformation is arranged, the gas absorption in the tower, liquid distillation, liquid extraction and tank diameter or the bubble tower etc. all relate to two-phase flow.What utilize in the measurement to oil-gas-water three-phase flow in the petroleum industry that the tripping device convection cell carries out obtaining after the initial gross separation also is the two-phase flow fluid.The two-phase flow fluid is divided into solution-air, and is gas-solid, liquid-solid, and liquid-liquid etc. for the application requirements of industry spot, need measure comparatively accurately to the flow of two-phase flow.The measuring method of two-phase flow can be divided into three kinds by whether separating, i.e. partition method, part partition method, non-partition method fully.Partition method is generally used for test satellite location fully, and equipment is huge, and can not the continuous on-line metering.The part partition method comprises shunting split-phase method and simple separation device method.The patent No. is that 98113068.2 proposition shunting split-phase methods are measured two-phase flow.At first distribute a part of two-phase fluid by divider, then use separation vessel that this part two-phase fluid is separated into single phase gas and single-phase liquid, measure and be converted under a proportional relationship the flow and the component of tested two-phase fluid then respectively with single phase gas flowmeter and single-phase liquid flowmeter, respectively this part single phase gas and single-phase liquid are returned in the flow duct of two-phase fluid more at last.The problem that this method exists is whether the two-phase fluid gas-liquid ratio of sampling part is with the ratio unanimity in former the flowing; Whether sampling rate (constant) influenced by flow pattern, flow rate fluctuation etc.Simple separation device method is to utilize small-sized separation vessel that biphase gas and liquid flow is carried out pre-separation, obtain based on gas phase a road and based on a road of liquid phase, each road is respectively with combination instrument and revise correlation and measure.Fluid after the metering is admixed together again to send back to former pipeline, and this device volume is also huger, and crushing is bigger, will make vehicle-mounted metering sled usually, is unfavorable for on-line measurement.Non-partition method is meant not to be needed two-phase flow is separated, and measuring system is directly measured two phase flow, and in order to improve measuring accuracy, its front end will add mixer usually.Non-partition method adopts technology such as conventional instrument combination or process tomographic imaging to realize usually.Though chromatography imaging technique develops decades, mostly is in the laboratory study stage, seldom can use at the scene.The conventional instrument combined method is the effective way that realizes that non-separation is measured.Differential pressure flowmeter is used for the measurement of two-phase flow very early, be industry member and academia generally acknowledge can both steady operation under the various fluidised forms of two-phase flow a kind of flowmeter, be the first-selection that is used for combined method.The patent No. is that 872U04538/34-181 has proposed the combined method two-parameter measurement with venturi and orifice plate, but only being suitable for measuring, this method mixes than uniform two-phase fluid, and it is bulky that two devices are combined usually, and two-phase flow flow pattern and flow parameter in flow process gradually change.This is just and the basic premise of combined type measurement---and its basic parameter was constant when two-phase fluid flow through each ingredient of device disagrees.If the measurement mechanism volume is too big, be difficult to guarantee that two-phase fluid flows through the flow parameter unanimity of each ingredient of composite set, so just exist the error of principle.The differential pressure that traditional in addition differential pressure flowmeter is got all comprises the frictional resistance pressure drop usually, and frictional resistance is very remarkable to the influence of measuring in gas-liquid two-phase flows, and how only recording the acceleration pressure drop of differential pressure flowmeter and not comprising the frictional resistance pressure drop is the key of accurately measuring.
Summary of the invention
The objective of the invention is to overcome the problems referred to above of prior art, a kind of venturi restriction device that is applicable to two-phase flowmeter that proposes, and a kind of two-phase flowmeter system that adopts this kind venturi restriction device proposed, this kind restriction device and measuring system, do not need two-phase flow is separated, do not need mixer, according to heavy position pressure drop signal directly convection discern, carry out flow measurement according to the different different measurement models of flow pattern employing.
The present invention at first proposes a kind of slit venturi restriction device, comprise the inlet, contraction section, slot segments, expansion segment and the outlet that connect successively, described slot segments is one section long and narrow pipeline, and its cross section is long and narrow rectangle, and area of section is less than the area of section of entrance and exit.
In the technique scheme, the length in the rectangle cross section of slot segments and wide ratio should be preferably 10: 1 between 6: 1 to 20: 1; Angle of throat from the contraction section to the slot segments is not more than 25 °, and the angle of flare is not more than 25 °; Angle of throat from the slot segments to the expansion segment is not more than 25 °, and the angle of flare is greater than 25 °.
Slit venturi restriction device of the present invention, preferably the cross section with the slot segments middle part is the plane of symmetry, is symmetric shape.
The present invention also proposes a kind of gas-liquid two-phase flow measuring system that adopts above-mentioned venturi restriction device, comprise venturi restriction device, first, second, third differential pressure transmitter, a pressure unit, data acquisition and processing (DAP) unit, display unit, it is characterized in that, described venturi restriction device comprises inlet, contraction section, slot segments, expansion segment and the outlet that connects successively, the cross section of described slot segments is long and narrow rectangle, and its area of section is less than the area of section of entrance and exit; Two pressure ports of described first differential pressure transmitter are separately positioned on the two ends up and down of slot segments, are used to obtain heavy position pressure drop signal; Two pressure ports of described second differential pressure transmitter are arranged on the two ends of contraction section 17; Two pressure ports of described the 3rd differential pressure transmitter are arranged on the two ends of expansion segment 19; The pressure port of pressure unit is arranged on inlet or exit.
Above-mentioned gas-liquid two-phase flow measuring system, first differential pressure transmitter is preferably the high frequency difference frequency pressure transmitter; Also should on the venturi restriction device, temperature transmitter be installed.
Beneficial effect of the present invention and advantage are, slit venturi restriction device adopts the symmetrical structure design, can effectively eliminate the influence of frictional resistance pressure drop to measuring, make device can adapt to different gas-liquid two-phase media, different working conditions such as pipeline material, the factor that every influence relevant with friction force measured can be reduced or eliminate.Utilization perpendicular to horizontal flow to heavy position pressure reduction fluctuating signal with the time equal signal, avoided equally along the influence of journey frictional resistance, can the accurate recognition flow pattern and measure phase content, and implement simple, conveniently.Adopt the different schemes of finding the solution according to different flow patterns.Realized not separating the purpose of measuring the gas-liquid two-phase flow.The device volume I is implemented the continuous on-line measurement to be connected easily on the pipeline.
Description of drawings
Fig. 1 is the front elevation of slit venturi restriction device of the present invention;
Fig. 2 is the vertical view of slit venturi restriction device of the present invention;
Fig. 3 is the structure principle chart of slit venturi gas-liquid two-phase flow measuring system of the present invention;
Fig. 4 is a slit venturi gas-liquid two-phase flow measuring system workflow diagram of the present invention.
Embodiment
With embodiment the present invention is further described with reference to the accompanying drawings.
Referring to Fig. 1 and Fig. 2, Fig. 1 is a front elevation, and Fig. 2 is a vertical view.Slit venturi restriction device of the present invention comprises inlet 9, contraction section 17, slot segments 18, expansion segment 19 and exports 10 several sections.The slot segments 18 that is positioned at the middle part is the long and narrow pipelines of an end, its cross section is long and narrow rectangle, rectangular length is much larger than width, from front elevation, the width of slot segments 18 is greater than the width of contraction section 17 and expansion segment 19, and look from vertical view, the width of slot segments 18 will be much larger than the width of contraction section 17 and expansion segment 19.Area of section is all littler than contraction section 17 and expansion segment 19 in the pipe of slot segments 18, says that from this point the present invention is still a kind of restriction device.Present embodiment is a kind of symmetrical structure, the shape of contraction section 17, be the expansion transition from 9 the two parts up and down of entering the mouth to the position that is connected with slot segments 18, be the contraction transition from 9 the middle part of entering the mouth to the position that is connected with slot segments 18, expansion segment 19 is symmetrical with contraction section 17.Horizontal positioned during use, inlet are external to by flange with outlet to be needed to measure on the pipeline of two phase flow.
Gas-liquid two-phase flow measuring system of the present invention, adopt above-mentioned slit venturi restriction device, utilization perpendicular to horizontal flow to heavy position pressure reduction fluctuating signal with the time equal signal identification flow pattern and measurement phase content, utilize the contraction section 17 and the differential pressure signal of expansion segment 19 to measure flow, and then try to achieve the separate phase flow rate of two-phase.Referring to Fig. 3, among the figure, 1, slit venturi restriction device, 2, pressure unit, 3, the contraction section differential pressure transmitter, 4, slot segments high frequency difference frequency pressure transmitter, 5, expansion segment differential pressure transmitter, 6, temperature sensor, 7, data acquisition and processing unit, 8, display unit.
The gas-liquid two-phase flow body enters slit venturi restriction device 1, slot segments 18 11,12 between can produce a heavy pressure drop, the vertical height between the device slit place pressure port is 100mm, high frequency difference frequency pressure transmitter 4 malleation terminations 12.It is directly related that the hourly value of this heavy position pressure drop signal and two-phase contain rate.Record the pulsating quantity and the hourly value of heavy position pressure drop by high frequency difference frequency pressure transmitter 4, utilize these two signals the two-phase flow state in the device 1 can be identified.Here, we are divided into three major types with the gas-liquid two-phase state that flows of horizontal tube, and the first kind is that gas phase is that main gas-liquid two-phase flows, and comprises so-called annular flow, stratified flow and wavy stratified flow, gas phase volume flow rate was big more a lot of than liquid phase during this class flowed, and the flow velocity of gas phase all is higher than liquid phase; Second class is that liquid phase is that main gas-liquid two-phase flows, and comprises bubble flow, slug flow.The volume flow ratio gas phase of liquid phase was a lot of greatly during this class flowed, and the flow velocity of gas phase all is lower than liquid phase.The 3rd class is an intermittent flow, mainly comprises slug flow.During this class flows the gas phase liquid phase intermittently wash away tube wall.According to the different different schemes of finding the solution in flow pattern decision back.When being diphasic flow based on gas phase in the pipe, the time equal signal of heavy position pressure drop is all lower, be no more than 300Pa, when being diphasic flow based on liquid phase in the pipe, the time equal signal of heavy position pressure drop is all higher, be not less than 500Pa, and when in the pipe being the diphasic flow at intermittence, the time equal signal then be the staggered fluctuation status that occurs of height, by the time equal signal value size these three kinds of flow states can be distinguished, cooperate the fluctuating signal of high frequency can distinguish more accurately that gas-liquid flows separately respectively or gas-liquid two-phase flows again.When being diphasic flow based on gas phase in the pipe, the contraction section 17 by slit venturi restriction device 1 obtains the information relevant with flow with two differential pressure transmitters 3,5 of expansion segment 19.The differential pressure of contraction section 17 obtains between 13,14 two pressure ports, differential pressure transmitter malleation termination 13, and the differential pressure of expansion segment 19 obtains between 15,16 two pressure ports, the malleation termination 16 of differential pressure transmitter.The differential pressure of contraction section 17 equals to quicken pressure drop and frictional resistance pressure drop sum, and the pressure drop of expansion segment 19 equals to quicken the poor of pressure drop and frictional resistance pressure drop.These two differential pressure signal additions are averaged and can will speed up pressure drop and obtain, and do not comprise the frictional resistance pressure drop, and quickening has definite relation between pressure drop and two phase flow and the phase content.Between the ratio of 3,5 two differential pressure signals of differential pressure transmitter and the phase content definite funtcional relationship is arranged also, by flow with contain the rate solving simultaneous equation and can obtain two phase flow.Be that diphasic flow based on liquid phase is in pipe, then can try to achieve phase content according to the hourly value of heavy position pressure reduction, obtain flow informations by two differential pressure transmitters 3,5 of the contraction section 17 of restriction device 1 and expansion segment 19, simultaneous solution can obtain two phase flow.When in the pipe being the intermittent flow state, alternately occur based on the mobile of gas phase with based on flowing of liquid phase, can identify these the two kinds times of flowing and replacing with hourly value by the heavy position pressure drop fluctuation value that high frequency difference frequency pressure transmitter 4 records equally, find the solution with the scheme of finding the solution accordingly respectively then and get final product.Temperature transmitter 6 is used to revise gas and density of liquid.All signals all enter data acquisition and processing unit 7 is handled.Show by display unit 8.Data acquisition and processing unit 7 and display unit 8 also can be realized with computer system.The concrete course of work of system is seen workflow Fig. 4.
Claims (5)
1. a slit venturi restriction device comprises the inlet, contraction section, slot segments, expansion segment and the outlet that connect successively, and described slot segments is one section long and narrow pipeline, and its cross section is long and narrow rectangle, and area of section is less than the area of section of entrance and exit; The length in the rectangle cross section of described slot segments and wide ratio are between 6: 1 to 20: 1; Angle of throat from the contraction section to the slot segments is not more than 25 °, and the angle of flare is not more than 25 °; Angle of throat from the slot segments to the expansion segment is not more than 25 °, and the angle of flare is greater than 25 °; Described slit venturi restriction device is the plane of symmetry with the cross section at slot segments middle part, is symmetric shape.
2. slit venturi restriction device according to claim 1 is characterized in that, the length in the rectangle cross section of described slot segments and wide ratio are 10: 1.
3. gas-liquid two-phase flow measuring system, comprise the venturi restriction device, first, second, third differential pressure transmitter, a pressure unit, data acquisition and processing (DAP) unit, display unit, it is characterized in that, described venturi restriction device comprises inlet, contraction section, slot segments, expansion segment and the outlet that connects successively, and the cross section of described slot segments is long and narrow rectangle, and its area of section is less than the area of section of entrance and exit; Two pressure ports of described first differential pressure transmitter are separately positioned on the two ends up and down of slot segments, are used to obtain heavy position pressure drop signal; Two pressure ports of described second differential pressure transmitter are arranged on the two ends of contraction section; Two pressure ports of described the 3rd differential pressure transmitter are arranged on the two ends of expansion segment; The pressure port of pressure unit is arranged on inlet or exit; The length in the rectangle cross section of described slot segments and wide ratio are between 6: 1 to 20: 1; Angle of throat from the contraction section to the slot segments is not more than 25 °, and the angle of flare is not more than 25 °; Angle of throat from the slot segments to the expansion segment is not more than 25 °, and the angle of flare is greater than 25 °; Described slit venturi restriction device is the plane of symmetry with the cross section at slot segments middle part, is symmetric shape.
4. gas-liquid two-phase flow measuring system according to claim 3 is characterized in that, first differential pressure transmitter is the high frequency difference frequency pressure transmitter.
5. gas-liquid two-phase flow measuring system according to claim 3 is characterized in that, also is provided with temperature transmitter on the venturi restriction device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710150184XA CN101178347B (en) | 2007-11-15 | 2007-11-15 | Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710150184XA CN101178347B (en) | 2007-11-15 | 2007-11-15 | Narrow slit Venturi throttling set and gas-liquid two-phase flow measuring system |
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| CN101178347A CN101178347A (en) | 2008-05-14 |
| CN101178347B true CN101178347B (en) | 2011-02-16 |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102042853B (en) * | 2010-11-17 | 2012-07-11 | 西安中望流量仪表有限公司 | Internal-mounted combined type Venturi nozzle throttle mechanism |
| CN102865895A (en) * | 2012-05-29 | 2013-01-09 | 成都飞机设计研究所 | Venturi flow sensor |
| CN102944267B (en) * | 2012-11-15 | 2015-07-15 | 天津大学 | Double-throttling three-differential-pressure wet-gas two-phase flow measurement system |
| CN103048019B (en) * | 2012-11-15 | 2016-05-04 | 天津大学 | Based on two differential pressure flux of moisture measurement mechanisms of long throat venturi |
| CN102944271A (en) * | 2012-11-27 | 2013-02-27 | 银川融神威自动化仪表厂(有限公司) | Composite internal and external venturi tube flowmeter |
| CN103196505B (en) * | 2013-04-22 | 2016-04-06 | 刘建中 | A kind of three-phase fluid ratio and flow testing device and computing method |
| CN105486358B (en) * | 2015-11-19 | 2018-11-16 | 中国石油大学(华东) | Gas-liquid two-phase flow parameter measurement method based on Venturi tube double difference pressure |
| CN105675253B (en) * | 2016-01-05 | 2018-04-17 | 中山大学 | Discrimination method and its system based on the analysis of two phase flow pressure drop noise spectrum |
| CN106092236B (en) * | 2016-05-26 | 2019-08-20 | 深圳市联恒星科技有限公司 | A kind of multiphase flow metering detection system |
| CN106872530B (en) * | 2017-01-16 | 2019-08-13 | 天津大学 | Two phase flow moisture content is adaptively connected estimation method |
| CN107063932A (en) * | 2017-03-01 | 2017-08-18 | 榆林学院 | It is a kind of to observe the device that drop is migrated under Venturi tube pressure drop gradient |
| CN107228690A (en) * | 2017-04-10 | 2017-10-03 | 中国计量科学研究院 | It is a kind of not by non-measured direction flow rate effect Pitotmeter or flowmeter |
| CN107314794B (en) * | 2017-08-07 | 2019-09-27 | 燕山大学 | It is a kind of for measuring the method and device of dynamic flow |
| CN108254034B (en) * | 2018-02-07 | 2022-08-02 | 安徽中控仪表有限公司 | Online metering device and metering method for oil-gas-water split-phase flow |
| CN110220556A (en) * | 2019-06-25 | 2019-09-10 | 西安交通大学 | A kind of biphase gas and liquid flow double parameter transient measurement system |
| CN111721370B (en) * | 2020-05-19 | 2022-08-26 | 中国石油大学(北京) | Double-nozzle natural gas flow measuring device and system based on differential pressure |
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