CN108181357A - Vertical eddy flow split-phase capacitor integral type water-containing measuring instrument - Google Patents
Vertical eddy flow split-phase capacitor integral type water-containing measuring instrument Download PDFInfo
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- CN108181357A CN108181357A CN201810088701.3A CN201810088701A CN108181357A CN 108181357 A CN108181357 A CN 108181357A CN 201810088701 A CN201810088701 A CN 201810088701A CN 108181357 A CN108181357 A CN 108181357A
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- outer tube
- tube wall
- phase
- measuring instrument
- metal inner
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
Abstract
The present invention relates to a kind of vertical eddy flow split-phase capacitor integral type water-containing measuring instruments, including outer tube wall and interior electrode, the inner wall of outer tube wall is metal inner surface, as external electrode, it is characterized in that, metal inner electrode is fixedly arranged in the middle of in outer tube wall, insulating layer is coated with outside metal inner electrode, helical blade is further fixed in the periphery of metal inner electrode and insulating layer, oblique entrance is equipped on outer tube wall, the triangular angular of oblique entrance is identical with the helix angle of helical blade, so that tangentially angle enters the space between helical blade and outer tube wall to fluid, the length of interior electrode is the length of capacitance measurement section.
Description
Technical field
The invention belongs to moisture two-phase flow measurement technical fields, are related to a kind of vertical eddy flow split-phase capacitor integral type and contain
Measuring device.
Background technology
Moisture is widely present in nature and industrial every field.Liquid phase volume is containing important ginseng of the rate as moisture
One of number realizes that its accurate measurement not only directly affects the measurement accuracy of flow, but also has weight to industrial production, scientific research
Want meaning.In practical application, since gas liquid two-phase flow is complicated and changeable so that it is difficult that liquid phase volume is accurately measured containing rate.
With the development of science and technology, tracer technique, ray technology, nuclear magnetic resonance technique and capacitance technology etc. are each applied to moisture content
It measures.However the safety of the sample representation of tracer, ray and the structural complexity of nuclear magnetic resonance and high cost make
The use of these new technologies is restricted.Capacitance method is as a kind of technology of relative maturity, and current research is in capacitance
Device configuration aspects obtain rich experience, but can not be ignored be contact or contactless capacitance sensor,
It, which is responded, is largely dependent upon fluid in space distribution situation, and measurement result is caused to be influenced by flow pattern.
Chinese patent ZL 2,017 1 0465819.9 and Chinese patent ZL 2,017 1 0465822.0 propose a kind of survey
The high moisture percentage measuring apparatus of accuracy is measured, including superposed rotation phase splitting unit and the capacitance measurement list positioned at lower part
Member.This two parts of the device are separated, so overall structure is partially long；In addition, it is demonstrated experimentally that gas phase flow velocity is less than 10m/s, liquid
When phase volume is higher than 4% containing rate, it can not ensure the gas liquid two-phase flow form after playing rotation phase splitting unit and terminating into measuring unit
Stability so that measurement of water ratio value rises to 2% with the given reference standard value error of experiment by 0.5%.
Invention content
The purpose of the present invention is overcoming the above problem of the prior art, propose that a kind of vertical eddy flow split-phase capacitor integral type contains
Eddy flow phase splitting unit and capacitance measurement unit are combined into one by measuring device, are constructed while realizing the distribution of gas-liquid split-phase
Capacitor completes the measurement to moisture content, and the present invention adopts the following technical scheme that：
A kind of vertical eddy flow split-phase capacitor integral type water-containing measuring instrument, including outer tube wall and interior electrode, outer tube wall it is interior
Wall is metal inner surface, as external electrode, which is characterized in that metal inner electrode is fixedly arranged in the middle of in outer tube wall, it is electric in metal
Insulating layer is coated with outside pole, helical blade is further fixed in the periphery of metal inner electrode and insulating layer, is set on outer tube wall
There is oblique entrance, the triangular angular of oblique entrance is identical with the helix angle of helical blade so that tangentially angle enters fluid
Space between helical blade and outer tube wall, the length of interior electrode are the length of capacitance measurement section.
Preferably, between 10 °~50 ° of the helical blade lift angle.The top of metal inner electrode is apart from described oblique
At least one screw pitch between entrance.The swirl vane 2~10 encloses totally.If runner internal diameter is D, outer tube wall internal diameter for 0.3~
3D, capacitance measurement segment length are 1D~5D.The diameter ratio of inner and outer electrodes is 1:2~1:10.Entrance tilt length is not short
In 3D.
Compared with prior art, the present invention has the following technical effect that：
(1) eddy flow split-phase and capacitance measurement are integrated by the present invention, that is, ensure that the split-phase distribution of gas-liquid, and shorten
Total length；
(2) gas-liquid two-phase tangentially flows into eddy flow split-phase section along entrance is tilted, and the guide functions of screw thread change the stream of fluid
Dynamic direction and state.Liquid phase is got rid of across gas phase to tube wall since density is bigger than normal while moving in a circle under the action of the centrifugal force.
The split-phase nowed forming of central area, liquid phase along tube wall is concentrated on so as to fulfill gas phase, overcomes entrance
The interference that flow pattern measures phase content.After being more than 1 circle helical blade, gas-liquid distribution is basicly stable, can conduct
Measuring section；
(3) in measuring section, gas-liquid two-phase continues to keep split-phase distribution, while metal outer pipe wall under the effect of screw thread blade
External electrode is collectively formed with conductive liquid film, interacts to form capacitor with interior electrode.Since variation of the gas-liquid two-phase containing rate is straight
Connecing influences pipe wall liquid film thickness, i.e. the distance between internal and external electrode changes, and leads to capacitance variation, realize only with liquid phase body
Product contains water gaging containing the relevant capacitance of rate；
(4) present invention can be connected after measuring section by expanding reducing pipe with the straight tube of arbitrary caliber, pass through change
Expand the height of the adjustable in length whole device of reducing pipe；
(5) present invention directly measures liquid phase volume containing rate using capacitance sensor, and capacitance measurement precision is high, containing water gaging standard
True property is good；
(6) present invention, which selects, tilts entrance, and one side angle of inclination is identical with screw thread blade lift angle, another aspect inlet face
Circulation area is identical in eddy flow split-phase section with fluid for product, ensures to reduce pressure damage while the moisture flow stability of inlet
It loses；
(7) without separation, radiological techniques and tracer technique are not depended on, moisture liquid phase content is measured, structure letter
It is single, safe and reliable.
Description of the drawings
The vertical eddy flow split-phase capacitor integral type water-containing measuring instrument structure diagram of Fig. 1 present invention.
Gas-liquid VELOCITY DISTRIBUTION in Fig. 2 eddy flow split-phase sections.
(emulation experiment condition：Pressure 1.2MPa；Moisture content 15%；Gas phase apparent velocity：10m/s)
Liquid phase volume cloud charts in Fig. 3 eddy flow split-phase sections.
(emulation experiment condition：Pressure 1.2MPa；Moisture content range 5~15%；Gas phase apparent velocity：10m/s)
Fig. 4 differences liquid phase volume corresponds to section figure containing rate containing rate.
(emulation experiment condition：Pressure 1.2MPa；Moisture content range 1~20%；Gas phase apparent velocity：5m/s)
Fig. 5 capacitances and liquid phase volume relational graph containing rate.
(emulation experiment condition：Pressure 1.2MPa；Moisture content range 0~20%；Gas phase apparent velocity：5m/s)
Description of the drawings is as follows：1 tilts entrance, 2 outer tube walls, 3 helical blades, 4 insulating layers, 5 metal inner electrodes, 6 connection methods
Orchid, 7 scalable diameter pipeline sections
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 moisture two phase flow, and structure diagram is as shown in Figure 1.It can be with
Arbitrary gas flow measurement device is used cooperatively, such as orifice plate, venturi, nozzle, V cone throttling set and ultrasound, turbine, hot type
Wait flowmeters.
The present invention is different from previous moisture moisture percentage measuring apparatus, while being to carry out eddy flow split-phase to gas-liquid two-phase
Carry out the measurement of capacitance.As shown in Figure 1, gas-liquid two-phase tangentially flows into eddy flow split-phase section through tilting entrance 1, to realize that fluid is without hindrance
Force flow is moved, and entrance angle of inclination is 10 °~50 ° as 3 lift angle of helical blade, while ensures to cut area with fluid in eddy flow
Circulation area in split-phase channel is identical, to reduce the pressure loss.Liquid phase does circumference under the action of the centrifugal force since density is bigger than normal
It is got rid of while movement across gas phase to tube wall.Central area is concentrated on so as to fulfill gas phase, liquid phase flows shape along the split-phase of tube wall
State overcomes the interference that entrance flow pattern measures phase content.Simulation study is found, after being more than 1 circle screw thread, gas-liquid distribution base
This stabilization can be used as measuring section, and in measuring section, central metal bar is as interior electrode 5, and eddy flow phase-splitter is (including 4 He of insulating layer
Helical blade 3) it covers in the outer surface of interior electrode, metal outer pipe wall 2 collectively forms external electrode with conductive liquid film, and then forms capacitance
Device, to improve capacitance sensitivity, internal and external electrode diameter ratio is 1:2~1:10.The embodiment of Fig. 1, eddy flow split-phase section and measuring section
It is consistent, interior electrode perforation is entire to measure pipeline, more preferably, can also there is another embodiment, interior electrode moves down, setting
After distance tilts 1 circle screw pitch of entrance 1.
Emulation experiment medium is empty gas and water two phase flow, operating pressure 1.2MPa, moisture content 15%, gas phase flow velocity 10m/s.
As shown in Figure 2 on the eddy flow split-phase section central cross-section of the present invention, close to inner tubal wall and outer tube wall at take from top to bottom two it is straight
Line, nearly inner wall line respectively shown in figure and nearly exterior line analyze the gas-liquid axis on two straight lines, diameter, cut three direction speed.
At nearly inner wall line, there are twice of speed sliding differences for gas-liquid axial velocity and tangential velocity, and for radial velocity, gas phase connects always
It is bordering on 0, and liquid velocity is up to 5m/s, outer tube wall is directed toward in direction by central shaft, it is meant that during gas is maintained at nearly inner wall line
Heart district domain, without the trend of outside vessel wall motion, liquid phase is real due to being spread by the effect of stronger centrifugal force across gas phase to outer tube wall
The split-phase flowing of gas-liquid two-phase is showed；Compared to nearly inner wall linear velocity, close at outer tube wall, either axial velocity or tangent line
Speed, gas-liquid two-phase slippage is close to 1.The difference is that gas phase radial velocity is negative, liquid phase radial velocity is 0, i.e. liquid phase is got rid of
Formed after to wall surface liquid film will not occur it is secondary raise, there is the trend that is moved to central area in opposite gas phase, realize again
The separation of gas-liquid two-phase.In addition, the two phase velocities regularity of distribution and size between each screw thread of measuring section is basically identical, i.e. this hair
Gas liquid two-phase flow is basicly stable in bright measuring section.
Fig. 3 gives the influence that liquid phase volume is distributed liquid phase containing rate, and liquid phase is common with metal pipe-wall as conducting medium
Capacitor external electrode is formed, increases to 15% from 5% as liquid phase volume contains rate, liquid film changes at outer tube wall, it is meant that
Significant change also occurs for corresponding capacitance value.The capacitance that i.e. present invention measures changes containing rate with liquid phase volume and is changed.
When being illustrated in figure 4 pressure 1.2MPa, speed 5m/s, different liquid phase volumes contain rate under the conditions of eddy flow split-phase section everybody
Put corresponding section value containing rate.In measuring section, the liquid phase section kept stable of value containing rate is constant, entire measuring section gas-liquid point
Cloth is relatively stable, can carry out the measurement of capacitance.
By Comsol Electric Field Simulations, under pressure 1.2MPA, flow velocity 5m/s working conditions, prediction capacitance and liquid phase body
Product is containing the curve graph between rate with reference to Fig. 5.It can be seen from the figure that increase table of the simulation and prediction capacitance of the present invention with liquid holdup
Reveal increased trend, it can be achieved that a capacitance corresponds to unique liquid phase content value；In addition, capacitance sensitivity is also with liquid phase
Increase of the volume containing rate is continuously increased, and in liquid holdup less than in the case of 5%, capacitance sensitivity is 0.1~0.2PF, and containing
Liquid rate is in 5%~15% section, sensitivity is 0.2~0.3PF, and in the range of 15%-20%, sensitivity is more than liquid holdup
0.3PF。
Claims (7)
1. a kind of vertical eddy flow split-phase capacitor integral type water-containing measuring instrument, including outer tube wall and interior electrode, the inner wall of outer tube wall
For metal inner surface, as external electrode, which is characterized in that metal inner electrode is fixedly arranged in the middle of in outer tube wall, in metal inner electrode
Outside be coated with insulating layer, be further fixed on helical blade in the periphery of metal inner electrode and insulating layer, be equipped on outer tube wall
Oblique entrance, the triangular angular of oblique entrance are identical with the helix angle of helical blade so that tangentially angle enters spiral shell to fluid
Space between vane piece and outer tube wall, the length of interior electrode are the length of capacitance measurement section.
2. water-containing measuring instrument according to claim 1, which is characterized in that 10 °~50 ° of the helical blade lift angle it
Between.
3. water-containing measuring instrument according to claim 1, which is characterized in that the top distance of the metal inner electrode
At least one screw pitch between the oblique entrance.
4. water-containing measuring instrument according to claim 1, which is characterized in that the swirl vane 2~10 encloses totally.
5. water-containing measuring instrument according to claim 1, which is characterized in that set runner internal diameter as D, outer tube wall internal diameter is
0.3~3D, capacitance measurement segment length are 1D~5D.
6. the capacitance measurement section according to claim 1 or 4, which is characterized in that the diameter ratio of inner and outer electrodes is 1:2
~1:10.
7. water-containing measuring instrument according to claim 1, which is characterized in that it is characterized in that, entrance tilt length is not short
In 3D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810088701.3A CN108181357B (en) | 2018-01-30 | 2018-01-30 | Vertical rotational flow split-phase capacitance integrated water content measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810088701.3A CN108181357B (en) | 2018-01-30 | 2018-01-30 | Vertical rotational flow split-phase capacitance integrated water content measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108181357A true CN108181357A (en) | 2018-06-19 |
| CN108181357B CN108181357B (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810088701.3A Active CN108181357B (en) | 2018-01-30 | 2018-01-30 | Vertical rotational flow split-phase capacitance integrated water content measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019179293A1 (en) * | 2018-03-22 | 2019-09-26 | 天津大学 | System for measuring gas-liquid two-phase flow |
| CN113267539A (en) * | 2021-04-22 | 2021-08-17 | 冯芷菁 | Capacitance type probe for crude oil water content analyzer |
Citations (6)
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|---|---|---|---|---|
| CN1147090A (en) * | 1995-06-22 | 1997-04-09 | 大庆石油管理局油田建设设计研究院 | Intelligent spiral capacitor type apparatus for testing water content in oil and testing method thereof |
| CN101183125A (en) * | 2007-12-07 | 2008-05-21 | 中国计量科学研究院 | Device for determining example dielectric characteristic, measuring method and applications thereof |
| CN104833263A (en) * | 2015-04-30 | 2015-08-12 | 北京化工大学 | High-frequency electromagnetic scale preventing and removing device with internally-installed rotor |
| CN107421999A (en) * | 2017-06-19 | 2017-12-01 | 天津大学 | Biphase gas and liquid flow plays rotation phase-splitter |
| CN107422000A (en) * | 2017-06-19 | 2017-12-01 | 天津大学 | Biphase gas and liquid flow plays rotation split-phase type electric capacity moisture percentage measuring apparatus |
| CN208399422U (en) * | 2018-01-30 | 2019-01-18 | 天津大学 | Vertical eddy flow split-phase capacitor integral type water-containing measuring instrument |
-
2018
- 2018-01-30 CN CN201810088701.3A patent/CN108181357B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147090A (en) * | 1995-06-22 | 1997-04-09 | 大庆石油管理局油田建设设计研究院 | Intelligent spiral capacitor type apparatus for testing water content in oil and testing method thereof |
| CN101183125A (en) * | 2007-12-07 | 2008-05-21 | 中国计量科学研究院 | Device for determining example dielectric characteristic, measuring method and applications thereof |
| CN104833263A (en) * | 2015-04-30 | 2015-08-12 | 北京化工大学 | High-frequency electromagnetic scale preventing and removing device with internally-installed rotor |
| CN107421999A (en) * | 2017-06-19 | 2017-12-01 | 天津大学 | Biphase gas and liquid flow plays rotation phase-splitter |
| CN107422000A (en) * | 2017-06-19 | 2017-12-01 | 天津大学 | Biphase gas and liquid flow plays rotation split-phase type electric capacity moisture percentage measuring apparatus |
| CN208399422U (en) * | 2018-01-30 | 2019-01-18 | 天津大学 | Vertical eddy flow split-phase capacitor integral type water-containing measuring instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019179293A1 (en) * | 2018-03-22 | 2019-09-26 | 天津大学 | System for measuring gas-liquid two-phase flow |
| CN113267539A (en) * | 2021-04-22 | 2021-08-17 | 冯芷菁 | Capacitance type probe for crude oil water content analyzer |
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| Publication number | Publication date |
|---|---|
| CN108181357B (en) | 2020-09-15 |
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