CN109613074A - Multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus - Google Patents
Multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
- G01N33/2847—Water in oil
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Abstract
The present invention relates to a kind of multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus, including eddy flow phase splitting unit and capacitance measurement unit, it is characterized in that, eddy flow phase splitting unit includes helical blade support rod, 2 or more the helical blades and outer tube wall for being distributed in helical blade support rod periphery are constituted；Capacitance measurement unit includes metal inside, is covered on the insulating layer and outer metal pipe-wall of metal inside periphery, and the upstream face of helical blade support rod is airflow design.Gas-liquid split-phase distributed effect of the invention is good, does not depend on two phase flow signals, it can be achieved that capacitor cell is to the reliable measurements of moisture content.
Description
Technical field
The invention belongs to biphase gas and liquid flow flow measurement technology fields, are related to a kind of multiple-blade flow-guiding type eddy flow split-phase capacitor
Water-containing measuring instrument.
Background technique
Air-water two phase flow is widely present in the fields such as petroleum, chemical industry, the energy, and the accurate measurement of moisture content has very heavy
The meaning wanted.Measurement of water ratio means mainly have ray technology, microwave technology, electricity (resistance, capacitor) technology, differential pressure skill at present
Art etc..In recent years since safety management requires the use of increasingly strict radiological techniques to be restricted.
In on-radiation measurement of water ratio technology, capacitance method is with a long history, principle is simple, easy to maintain, the disadvantage is that by
Flow pattern influences serious.
It is divided into contact and contactless two major classes based on capacitance sensor, since capacitance sensor response depends strongly on
It is distributed in the dielectric space of dispersed phase, in order to reduce the inhomogeneities of spatial sensitivity, researchers are to capacitance sensor electrodes
Structure has carried out a large amount of optimization design, has studied the measurement characteristic of its phase content under different flowing flow patterns.Contactless electricity
The measurement of water ratio state-of-the-art of appearance method is as follows:
Tsinghua University Zhang Baofen in 1992 et al. is adopted using finite Element Method Study " to wall type non-contact capacitive sensor "
Measurement method is motivated with 8 electrode rotaries, it is intended to overcoming mutually to be distributed influences on containing rate,.JTollefsen in 1998 et al. design
The capacitance sensor of perficial helical electrode, it is intended to measure the water phase and gas phase concentration in crude oil.Author utilizes finite element method
Emulation, and simulation result and static test result are compared.A.Jaworek in 2009 et al. is passed using to wall type capacitor
The phase content of the phase shift information measurement biphase gas and liquid flow of sensor, test medium use distilled water and isopropanol, straight using difference
The polyamide bar insertion pipeline center die of diameter intends gas core, has carried out the test of annular flow Static simulation test.Min S K in 2012 etc.
People's optimization design simulates ring using the machine glass bar of different-diameter to two kinds of sensors of wall type capacitor and ring-plate capacitor
Shape stream, has carried out static test.Zhejiang University's woods Chong in 2014 et al. proposes non-contact six electrode arrays column capacitive coupling conductance
Sensor reduces the influence being mutually distributed to measuring containing rate by cycle motivation, Receiving, and the static state for simulating different flow patterns is real
It tests.Kathleen De Kerpel in 2015 et al. is tested using the horizontal tube to wall type capacitor in internal diameter 8mm, flow pattern
Including slug flow, intermittent flow and annular flow, author utilize the technique study of wavelet analysis flow pattern and phase content.Conclusion is mutually to contain
The measurement result of rate is inevitably influenced by flow pattern.University Of Tianjin Zhao An in 2015 et al. has studied two kinds of capacitance sensings
Device --- to the adaptability that wall type and double-screw type sensor measure biphase gas and liquid flow phase concentration, build vertical ascent gas-liquid
Two phase flow capacitance sensor measuring system.Conclusion is, and double-screw type capacitor poor to wall type capacitance sensor Measurement Resolution
Sensor has relatively high resolution capability to phase concentration, but the two is influenced by flow pattern
The measurement of water ratio state-of-the-art of contact capacitance method:
M J Da Silva in 2007 et al. design capacitance wire mesh sensor.To the bubble of vertical pipeline air and silicone oil
Shape stream is tested, and the image reconstruction to the axially and radially section of single bubble is realized.University Of Tianjin Zhai Lusheng in 2013
Et al. using parallel lines capacitance probe measurement horizontal tube oil-water two-phase flow cross-correlation speed, discovery parallel lines capacitance probe it is mutual
Correlation properties are influenced by the fluidal texture of grease.University Of Tianjin X.Chen in 2015 et al. is existed using coaxial capacitance sensor
Oil-water two-phase flow experiment is carried out in the tedge of internal diameter 20mm.The experimental results showed that the response of ganged condenser and the close phase of flow pattern
It closes.In addition, 3D capacitor tomoscan ECT technology is widely used in visualizing the distribution of nowed forming and multiphase flow containing rate, but
Existing system haves the shortcomings that spatial resolution is low.X-ray and gamma ray scanner can also be applied to multiphase flow, but cost
It is higher.
Chinese patent application 201710465819.9 and Chinese patent application 201710465822.0 propose one kind can
Improving capacitance sensor is influenced the device of flow-guiding type eddy flow individual phase measurement capacitor moisture content by flow pattern, however, due to the device
It for the design of single helical blade, will lead to when two-phase flow flow velocity is lower, it is limited to play swirl effect.
In conclusion according to capacitance method phase content measurement present Research analysis it is found that both at home and abroad researcher
A large amount of research work is carried out in terms of capacitor arrangement, valuable experience has been achieved, however, the response of capacitance sensor is still
It is old to be strongly dependent on the distribution of dispersed phase dielectric space, cause the measurement result of phase content invariably by the influence of fluidal texture.
The present invention is directed to this problem, devises a kind of capacitor moisture sensor with mutliblade special eddy flow split-phase function,
The gas-liquid two-phase of random dispersion can be effectively changed to the spiral shape flow field of good distribution rule, mutually contained to break
The situation that the measurement of rate is influenced by moisture fluidal texture.
Summary of the invention
The purpose of the present invention proposes that one kind is more it is intended that air-water two phase flow measurement of water ratio provides a kind of new measuring device
Blade guide type eddy flow split-phase capacitor water-containing measuring instrument is effectively overcome using multiple groups helical blade so that separation is more thorough
Gravity influences.Rise rotation rectification after immediately capacitance measurement part will guarantee to cut within the scope of certain length since liquid phase inertia is larger
It is larger to speed, it remains to that liquid phase is maintained steadily to be distributed on tube wall, gas-liquid split-phase distributed effect is good, two phase flow signals are not depended on,
Capacitor cell can be achieved to the reliable measurements of moisture content, the present invention adopts the following technical scheme:
A kind of multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus, including eddy flow phase splitting unit and capacitor measurement of water ratio
Unit, which is characterized in that eddy flow phase splitting unit includes helical blade support rod, is evenly distributed on helical blade support rod periphery
2 or more helical blades and outer tube wall；Capacitance measurement unit includes metal inside, is covered on the thin absolutely of metal inside outer surface
Edge layer and the outer metal pipe-wall coaxial with metal inside.
Preferably, the lift angle of helical blade is between 5 °~85 °.Each helical blade is circumferentially uniformly distributed.Helical-blade
The tail portion of piece support rod merges interconnection with the matching of the size of metal inside, and outer tube wall and outer metal pipe-wall size, which match, to be merged
It is connected with each other.If incoming flow internal diameter of the pipeline is D, the screw pitch of helical blade is 0.5D or more, and capacitance measurement segment length is greater than 1D, outside
Metal pipe-wall diameter is metal inside diameter 2 times or more.The upstream face of helical blade support rod is streamlined.
Compared with prior art, the present invention has the following technical effect that:
(1) air-water two phase flow enters eddy flow phase splitting unit, the guide functions of helical blade change fluid flow direction and
State.Liquid phase moves in a circle under the action of the centrifugal force since density is bigger than normal, and liquid phase passes through gas phase and gets rid of to tube wall.To real
Existing gas phase concentrates on central area, liquid phase forms the gas-liquid split-phase nowed forming of rotation liquid film along tube wall；
(2) present invention has been reinforced swirl effect, has been overcome gravity to capacitance measurement knot using the flow-guiding type helical blade for being greater than group
The influence of fruit；
(3) upstream and downstream of the present invention only need to be with corresponding straight pipe flanged joint；
(4) in capacitance measurement section, gas-liquid two-phase continues to keep split-phase distribution, while outer metal pipe-wall and the common structure of liquid film
At external electrode, interact to form capacitor with metal inside.Liquid phase content is higher, and the liquid film for being distributed in tube wall is thicker, gas phase
As dielectric, thickness of liquid film changes, and leads to capacitance variation, realizes and only contains to liquid phase volume relevant capacitor containing rate
Water gaging；
(5) present invention directly measures liquid phase volume containing rate using capacitance sensor, and measurement capacitance is with volume liquid holdup
It is increased monotonically, there is measurement feasibility；
(6) without separation, radiological techniques and tracer technique are not depended on, the moisture content in biphase gas and liquid flow are measured,
Structure is simple, safe and reliable, and maintenance cost is low.
Detailed description of the invention
Multiple-blade flow-guiding type eddy flow split-phase capacitor water-containing measuring instrument structural schematic diagram Fig. 1 of the invention.
Fig. 2 eddy flow split-phase section helical blade structure figure, (a) are vane piece -- the 3 blade schematic diagrames of eddy flow phase splitting unit,
(b) vane piece -- 4 blade schematic diagrames are played for eddy flow split-phase section
Fig. 3 capacitive measuring principle schematic diagram.
Fig. 4 is based on empty air-water two phase flow CFD numerical simulation result, the axial liquid phase of capacitor water-containing measuring instrument under 0.6MPa
Cloud charts (white is Gas distribution, and black is liquid phase distribution).(a), (b), (c) are respectively that gas phase apparent velocity (is used below
Usg is indicated) under the conditions of 20m/s, liquid phase volume (being indicated below with LVF) containing rate is respectively 10%；Usg=3m/s, LVF=
Corresponding numerical simulation result when 10% and Usg=3m/s, LVF=50%.
Fig. 5 is based on empty air-water two phase flow CFD numerical simulation result, and gas phase apparent velocity is 20m/s, liquid phase body under 0.6MPa
Product is 10% containing rate, and gas-liquid two-phase is axial under operating point, radially and tangentially velocity contour, (a) are vapor axial VELOCITY DISTRIBUTION
Figure (b) is liquid phase axial velocity profile figure, (c) is gas phase radial velocity distribution map, (d) is liquid phase radial velocity distribution map,
(e) it is gas phase tangential velocity distribution map, (f) is liquid phase tangential velocity distribution map.
Fig. 6 is based on empty air-water two phase flow CFD numerical simulation result, and gas phase apparent velocity is 3m/s and 20m/s under 0.6MPa
Empty air-water two phase flow, the variation relation figure of equivalent thickness of liquid film and volume liquid holdup LVF.
Fig. 7 is based on empty air-water two phase flow CFD numerical simulation result, and gas phase apparent velocity is 3m/s and 20m/s under 0.6MPa
Empty air-water two phase flow, the variation relation figure of volume liquid holdup LVF and measurement capacitor.
Specific embodiment
The present invention is further described with reference to the accompanying drawings.
The present invention is a kind of moisture percentage measuring apparatus used in biphase gas and liquid flow, and structural schematic diagram is as shown in Figure 1.It is filling
Setting upstream can be applied in combination with any single-phase differential-pressure instrumentation, such as orifice plate, venturi, V cone standard and off-gauge throttling fill
It sets and is combined into measurement gas-liquid two-phase flow.
Multiple-blade flow-guiding type eddy flow split-phase capacitor water-containing measuring instrument of the invention, including eddy flow phase splitting unit 1 and capacitor
Measuring unit 2, eddy flow phase splitting unit 1 are made of helical blade 1-2, helical blade support rod 1-1 and outer tube wall 2-3, and capacitor is surveyed
Unit 2 is measured to be made of metal inside 2-1, insulating layer 2-2 and outer metal pipe-wall 2-3.
Eddy flow split-phase part, between 5 °~85 ° of helical blade (such as Fig. 2) lift angle, helical blade is at least two, can also be with
It is 3,4 or more, is circumferentially uniformly distributed.Club head is supported, top is divided into semielliptical shape, and lower part is divided into hemispherical, if
Incoming flow internal diameter of the pipeline is D, and screw pitch is 0.5D or more, and capacitance measurement segment length is 1D or more
The present invention is different from previous moisture percentage measuring apparatus, is to carry out the progress of eddy flow split-phase while to gas-liquid two-phase
The measurement of capacitor.As shown in Figure 1, gas-liquid two-phase flows into eddy flow split-phase section through upstream straight pipe, risen simultaneously with multiple groups helical blade
Rotation guarantees that liquid phase can be kept completely separate to tube wall with gas phase.Liquid phase realizes gas phase collection since density is bigger than normal under the action of the centrifugal force
In in central area, liquid phase along the split-phase nowed forming of tube wall, overcome the interference that flow pattern measures phase content.Simulation study hair
Existing, after helical blade, gas-liquid distribution is basicly stable.In capacitance measurement section, metal inside 2-1 is as interior electrode, outer gold
Belong to tube wall 2-3 and collectively form external electrode with the liquid film for being distributed in tube wall, gas phase and insulating layer 2-2 constitute insulating medium layer, in turn
Capacitor is formed, to improve capacitance sensitivity, metal inside diameter and outer metal pipe-wall diameter are than optional 1:2~1:8.
As shown in Fig. 2, Fig. 2 (a) is three helical blade schematic diagrames, each leaf angle is 120 °, if internal diameter of the pipeline is D,
Screw pitch is 2.5D；Fig. 2 (b) is four helical blade schematic diagrames, and each leaf angle is 90 °, if internal diameter of the pipeline is D, screw pitch is
1.5D。
Capacitive measuring principle and composition measure measured capacitance and reference as shown in figure 3, by discharging testing capacitance
The discharge time of capacitor realizes the measurement of capacitance.
It is analyzed based on CFD numerical simulation result, Fig. 4 is comparison (a), (b) it is found that gas phase apparent velocity 3m/s under 0.6MPa
When with 20m/s, when LVF is 10%, liquid phase distributional difference is little；(b) (c) is compared it is found that Usg is 3m/s condition under 0.6MPa
Under, liquid phase distribution situation when LVF is respectively 10% and 50%.Gas-liquid two on central cross-section of the invention as shown in Figure 4
No matter phase cloud charts are it is found that in high flow rate, low flow velocity, or in different liquid holdups (LVF=10% or 50%) situation,
Gas-liquid two-phase still is able to preferably separate, and in measuring section distribution rule, liquid phase is distributed in tube wall always, and gas phase is in pipeline
Center ensure that the feasibility of measurement.In measurement, water is conductor, collectively forms external electrode with outer metal pipe-wall, and air is exhausted
Edge medium so that water changes in wall surface spreading depth, and then changes insulating medium layer by changing different working conditions
Thickness changes measurement capacitance.
Capacitance measurement unit is distributed in different location velocity magnitude under the conditions of Fig. 5 is 0.6MPa-Usg20m/s-LVF10%
Figure.The pipe centerline (as shown in Figure 5) of 3 distances at equal intervals is taken in measuring section altogether, from numerical simulation result respectively
The gas phase of this 3 lines and axial velocity, tangential velocity and the radial velocity of liquid phase are extracted, to analyze the stability in flow field.
Fig. 5 (a) is it can be seen that for gas phase, and the vapor axial speed of pipeline center is larger, and side wall is smaller, 3 lines
VELOCITY DISTRIBUTION is almost the same, it was demonstrated that flow field is with good stability in entire capacitance measurement section；
For Fig. 5 (b) it can be seen that for liquid phase, the axial velocity difference at pipeline side wall and center is smaller, but still in being
Liquid velocity is larger at the heart；
Fig. 5 (c) is it can be seen that gas phase radial velocity is almost nil at the heart in the duct, it was demonstrated that gas phase is almost without radial fortune
It is dynamic, and in near-wall, it is positive i.e. conduit upper timesharing in y, gas phase radial velocity is negative, that is, moves downward, in duct bottom,
The radial velocity of gas phase is positive, that is, moves upwards.All in all, the trend of the oriented pipeline center's movement of gas phase at tube wall, and
Gas phase at non-tube wall is without radial motion；
Fig. 5 (d) in y as can be seen that be positive i.e. conduit upper timesharing, liquid phase radial velocity is positive, that is, moves upwards, in pipe
The radial velocity of road bottom, liquid phase is negative, that is, moves downward, and liquid phase is the directional velocity moved to side wall in entire pipeline,
The liquid phase radial velocity size of the position line3 will be slightly smaller than the position line1, but still be to the direction of vessel wall motion；
Fig. 5 (e), (f) are it can be seen that gas-liquid two-phase tangential velocity direction is identical, and size is almost consistent at tube wall.
Fig. 6 is that gas phase apparent velocity is respectively moisture content 0-90% under the conditions of 3m/s and 20m/s, equivalent liquid under 0.6MPa
The variation relation of film thickness and volume liquid holdup LVF.By in figure it will be seen that when gas phase flow velocity is constant, thickness of liquid film
It is corresponded with volume liquid holdup in capacitance measurement section, and initial change rate is larger, subsequent change rate tends to definite value, i.e. liquid film exists
Capacitance measurement section monotone increasing with liquid holdup.When gas phase velocity becomes larger, liquid film can slightly reduce.
Fig. 7 is that gas phase apparent velocity is respectively volume liquid holdup LVF and measurement under the conditions of 3m/s and 20m/s under 0.6MPa
The variation relation of capacitor, the present invention predict that capacitance shows increased trend, it can be achieved that a capacitor with the increase of liquid holdup
The corresponding unique liquid phase content value of value.
Claims (6)
1. a kind of multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus, including eddy flow phase splitting unit and capacitor measurement of water ratio list
Member, which is characterized in that eddy flow phase splitting unit includes helical blade support rod, is evenly distributed on the 2 of helical blade support rod periphery
A above helical blade and outer tube wall；Capacitance measurement unit includes metal inside, is covered on the thin absolutely of metal inside outer surface
Edge layer and the outer metal pipe-wall coaxial with metal inside.
2. the apparatus according to claim 1, which is characterized in that the lift angle of helical blade is between 5 °~85 °.
3. the apparatus according to claim 1, which is characterized in that each helical blade will be flowed along support even circumferential distribution
The uniform equal part in body channel.
4. the apparatus according to claim 1, which is characterized in that the downstream end of helical blade support rod and metal inside
Size, which matches to merge, to be connected with each other, and the outer metal pipe-wall size of the outer tube wall and capacitor cell that play rotation unit matches to merge and mutually connect
It connects.
5. the apparatus according to claim 1, which is characterized in that set incoming flow internal diameter of the pipeline as D, the screw pitch of helical blade is
0.5D or more, capacitance measurement unit length are greater than 1D.
6. the apparatus according to claim 1, which is characterized in that the upstream face of helical blade support rod is streamlined.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/117161 WO2019148945A1 (en) | 2018-01-30 | 2018-11-23 | Capacitance-based moisture content measurement device using multiple blades for phase separation |
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| CN201810088699X | 2018-01-30 | ||
| CN201810088699.XA CN108426925A (en) | 2018-01-30 | 2018-01-30 | Multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus |
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| CN201811314687.0A Pending CN109613074A (en) | 2018-01-30 | 2018-11-06 | Multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus |
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Cited By (3)
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| WO2019179293A1 (en) * | 2018-03-22 | 2019-09-26 | 天津大学 | System for measuring gas-liquid two-phase flow |
| CN111337546A (en) * | 2020-02-28 | 2020-06-26 | 西安建筑科技大学 | Two-phase flow pattern measuring method and falling film evaporation experimental device |
| CN111413377A (en) * | 2020-04-14 | 2020-07-14 | 中国人民解放军陆军勤务学院 | Device and method for measuring liquid holdup of cross section of gas-liquid two-phase pipe flow |
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| CN108426925A (en) * | 2018-01-30 | 2018-08-21 | 天津大学 | Multiple-blade eddy flow split-phase capacitor moisture percentage measuring apparatus |
| CN111175321A (en) * | 2019-08-20 | 2020-05-19 | 天津大学 | Gas-liquid two-phase flow water content measuring device and measuring method |
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| CN108426925A (en) | 2018-08-21 |
| WO2019148945A1 (en) | 2019-08-08 |
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Application publication date: 20190412 |