CN104075766B - The high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type and method in pipe - Google Patents
The high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type and method in pipe Download PDFInfo
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Abstract
The high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type and method in a kind of pipe, the device are mainly made up of pipeline, inner tube, two-stage cyclones, reducing pipe, cyclone pipe, transition conduit, increaser, despinner, Conventional compact separator and gas and fluid flowmeter；Its method is by using phase isolation technique in pipe, coordinating centrifugation and gravity fractionation, many separating steps of Jing to complete gas-liquid two-phase fluid being kept completely separate in pipeline, finally measure each phase flow rate using gas and fluid flowmeter respectively；The volume of partition method class gas-liquid two-phase flow measuring apparatus can significantly be reduced by the present invention, improved the real-time of measurement, and manufacturing cost can be significantly reduced, be easy to extensively apply in engineering.
Description
Technical field
The invention belongs to flow measurement technology field, and in particular to the high void fraction biphase gas and liquid flow of phase cellular-type in a kind of pipe
Body flow measurement device and method.
Background technology
" phase " in the present invention refers to physical property identical each several part, such as gas phase, liquid phase, oil phase, water in heterogeneous fluid
It is equal.Wherein gas phase and liquid phase can both be the homogeneous mixture of one-component material, or multi-component material, such as air,
Crude oil etc..Mutually separate in pipe and refer to each mutually convergence respectively is isolated to a specific region in pipeline, so as to final realization completely
Detached process.In two-phase flow measurement technology, partition method remains most reliable and precision highest technology at present.Because this
Method be gas-liquid two-phase fluid is separated into single phase gas and liquid after, then use each phase flow rate of single-phase flow flowmeter measurement respectively, it is real
Single-phase flow metering is converted into equal to multiphase flow metering on border, it is thus possible to avoid the factors such as variations in flow patterns and flowing instability
Impact to measuring, while also just eliminate setting up the great of special multiphase flow calibration system and corresponding transmission of quantity value system
Vast engineering.Such as United States Patent (USP) US4688418 " Method and apparatus for determing mass flow rate
And quality in a steam line ", disclose a kind of steam flow dryness measurement system of use cyclone separator.
But the disadvantage of this kind of method is that equipment is huge, cost is high, automatic control system is complicated, and the poor real for measuring.These
Shortcoming seriously limits its extensive application in engineering.In order to reduce the volume of separator, improve measurement characteristicses, people are carried out
Many trials, such as United States Patent (USP) US6128962 " Three-phase fluid flow measurement system and
Method ", discloses a kind of three-phase flow measuring apparatus using small-sized separator.This method is also referred to as partially separated method
(partial separation), there it can be seen that the size of separator is reduced really, but but sacrifices separation effect
Rate, it is impossible to three-phase flow is completely separated into single-phase flow, thus have impact on certainty of measurement, is this and must increase some amendment handss
Section.United States Patent (USP) US5390547 " Multiphase flow separation and measurement system " and
US7311001 " Multiphase flow measurement apparatus and method " individually discloses a kind of multiphase
Flow measuring apparatus, it is intended to without special separation equipment, constitute a kind of piece-rate system merely with heterogeneous fluid pipeline itself.From table
See on face, the system eliminates traditional separator really, but pipe diameter and length dimension due to being adopted are all very
Greatly, and also using external cyclonic separation mode, therefore substantially it and the not tangible difference of traditional partition method.
Chinese patent ZL98113068.2 discloses a kind of shunting split-phase type measuring method.By using proportional shunting means, making
The flow for actually entering separator is greatly reduced, so as to reduce the volume of required separator at double.But can run in use
One difficult, when flow very little (high void fraction or the low air void) of liquid phase or gas phase in two phase flow, due to have passed through point
Stream, thus the liquid phase or gas phase flow rate that flow out from separator are just less, so that less than the measurement lower limit of existing minimum stream gauge,
Cause measurement difficult, or even cannot measure.
The content of the invention
In order to overcome the shortcomings of that above-mentioned prior art is present, it is an object of the invention to provide phase cellular-type is high in a kind of pipe
Void fraction gas-liquid two-phase fluid flow measurement device and method, by adopting phase isolation technique in pipe, coordinate centrifugation and gravity point
From effect, gas-liquid two-phase fluid being kept completely separate in pipeline is completed through multiple separating steps, so as to significantly reduce separation
The volume of method class gas-liquid two-phase flow measuring apparatus, improves the real-time of measurement, and significantly reduces manufacturing cost, in order in engineering
It is upper extensively to apply.
In order to preferably illustrate technical scheme, below first brief analysis once biphase gas and liquid flow in high void fraction
Nowed forming (flow pattern) in Shi Guan.
Gas 01 (blank parts in figure) in the form of continuous state is distributed in pipeline 2, and liquid is then deposited with three kinds of forms
It is in pipeline 2：It is dispersed in gas with fine drop 4 (micron order and following), gas is suspended in larger drop 6 (grade)
Stream neutralization is close on tube wall with continuous liquid film 8.Liquid film 8 can be deposited on pipeline 2 (to be less than 4-6 meter per seconds) when flow velocity is relatively low
Bottom, when flow velocity further increases (be more than or equal to 6-12 meter per seconds), forms semicircular stream, when flow velocity is higher (more than 12-16 rice/
Second), liquid film 8 can form ring-type.When pipeline 2 is disposed vertically, due to stress symmetrically, distribution form and the horizontal tube flow velocity of liquid
Ring-type is formed when higher similar, but the thickness of liquid film 8 circumferentially can be more evenly.It follows that high void fraction gas-liquid two
When phase fluid flows in the pipeline, liquid will not be dispersed into minimum drop and be evenly mixed in air-flow, be formed so-called vaporific
Stream；Conversely, always there is a kind of stronger spontaneous separation trend in flow process between two-phase fluid：Drop assembles Synthesis liquid
Film, minute bubbles can be merged into air pocket, and gas and liquid spontaneously can collect to specific region respectively.But the opposing party
Face, can also be mutually mixed between gas phase and liquid phase in flow process really, cause to have been deposited on liquid film on tube wall at any time
Can be involved in air-flow again by gas.Flow velocity is higher, and the density contrast between gas-liquid is less, and this immixture is more obvious.Thing
On real in whole flow process, separate together with always accompanying with mixing, they can reach different under different conditions
Dynamic equilibrium.In conventional separators, mainly use centrifugal force liquid is driven on barrel and form liquid film, then recycle
Gravity is finally separating.In order to avoid air-flow sweeps away established liquid film (secondary droplets) again, typically all can in design
Axial flow velocity in strict control cylinder.As long as axial flow velocity is sufficiently low, this secondary droplets are just very faint.According to design
Experience, this critical flow velocity be 0.1 meter per second～4 meter per second, the normal flow far below gas-liquid two-phase fluid in pipeline.Therefore
Pipe diameter of the diameter of separator typically always than being attached thereto is big several times.Here it is separator size be difficult to reduce it is main
Reason.
As can be seen from the above analysis, separate and mixing is simultaneous conflict, both are all the time in a kind of dynamic
In state balance.If in time the liquid film separated can be isolated with air-flow in this dynamic process, then balance is just
Constantly can develop towards detached direction, until all of liquid in air-flow is all separated totally.Therefore as conventional separators that
Sample, increases the diameter (to reduce axial flow velocity) of cylinder simply, simply realizes gas-liquid separation in order to avoid secondary droplets
A kind of effective ways, but be not unique method, also definitely not one essential condition, moreover according to the formula of centrifugal acceleration
(a=V2/ R, V are tangential flow velocity, and R is the radius of cylinder), increase cylinder radius R also can reduce centrifugal acceleration simultaneously,
Separating effect is directly affected, so, the separation method that traditional partition method can not be optimal at last.As long as in fact can promote to separate
Dynamic equilibrium between mixing constantly develops towards detached direction, and gas-liquid two-phase fluid has also been that by pipeline
Fully separating, and as diameter is little, centrifugal force can be bigger, thus is more favorable to idetified separation effect.The present invention be exactly according to
Formed according to this thinking.
The present invention is adopted the following technical scheme that：
The high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type in a kind of pipe, including pipeline 2, by front dividing plate
The inner tube 12 that 53a and rear bulkhead 53b are fixed on 2 inwall of pipeline, is kept for one between the outer wall of the inwall and inner tube 12 of pipeline 2
Mezzanine space 14, streamwise, said inner tube 12 include being sequentially communicated and coaxial inner tube leading portion 12a, reducing pipe 32, eddy flow
Pipe 34, transition conduit 36, increaser 38 and inner tube back segment 12b, are provided with the first cyclone 16 and the second rotation in inner tube leading portion 12a
Stream device 22, is provided with despinner 52 and gas flowmeter 54 in inner tube back segment 12b；It is distributed with the tube wall of said inner tube 12 and passes through
Perforation or slot 15；Also include a central canal 24 in inner tube 12, the entrance of the central canal 24 be arranged at the top of pipeline 2
The outlet of muffler 46 is connected, and the outlet of central canal 24 is connected with transition conduit 36, the entrance of muffler 46 be arranged on pipe
It is connected with the top of the small-sized typical separators 45 of the connection of mezzanine space 14 at the top of road 2；Set in the bottom of the pipeline 2 successively
The first declining liquid tube 18, the second declining liquid tube 26, the 3rd declining liquid tube 28 and the liquid measure pipe 29 for being equipped with and connecting with mezzanine space 14；
First declining liquid tube, 18 bottom is connected with the entrance of liquid measure pipe 29, and the second declining liquid tube 26 is with the 3rd declining liquid tube 28 by connecting
Pipe 27 is connected, and is connected with the side of the first declining liquid tube 18 by communicating pipe 27；Liquid level is installed in the first declining liquid tube 18
Meter 58；Regulating valve 57 and fluid flowmeter 56 are installed on liquid measure pipe 29, the regulating valve 57 and liquidometer 58 pass through
Control signal wire 59 connects.
The aperture of the through hole being distributed on the tube wall of said inner tube 12 or the width of slot 15 are the percent of 2 internal diameter of pipeline
Less than one but be not less than 2 millimeters.
The central canal 24 is same with pipeline 2, inner tube 12, the second cyclone 24, reducing pipe 32, cyclone pipe 34 and transition conduit 36
Axle is installed, and is passed through from their center.
Diameter of the diameter of first declining liquid tube 18 less than or equal to pipeline 2, the second declining liquid tube 26 and the 3rd declining liquid tube
28 diameter less than the diameter of pipeline 2 1/3rd.
The first ring flat-plate 17b being fixed on 2 inwall of pipeline is provided with described jacket space 14, is additionally provided with and is fixed on
The second ring flat-plate 17a on 12 outer wall of inner tube, wherein the second ring flat-plate 17a outer rims being fixed on 12 outer wall of inner tube and 2 inwall of pipeline
Gap and the first ring flat-plate 17b inner edges for being fixed on 2 inwall of pipeline and the gap of 12 outer wall of inner tube be 1～5mm, along pipeline
Axis direction, the first ring flat-plate 17b and the second ring flat-plate 17a interlaced arrangements, form air seal component.
The external diameter of the transition conduit 36 1～6mm less than the internal diameter of cyclone pipe 34, and arrival end 37 stretched in cyclone pipe 34
At least 50mm, the port of export are connected with increaser 38, and the outer wall of transition conduit 36 forms a gap 39 with the inwall of cyclone pipe 34.
First cyclone 16 and the second cyclone 22 are formed around a central shaft by 4～8 helical blades, spiral
Blade is an entirety with central shaft, and helical blade outer rim is in close contact with the inwall of inner tube 12, very close to each other；First eddy flow
Blade screw angle 2 ° of the blade screw angle of device 16 at least above the second cyclone 22.
Described front dividing plate 53a is a conical tube, is installed on the porch of measurement apparatus, and upstream one end is interior with pipeline 2
Wall is connected, and downstream one end is connected with inner tube 12；Or front dividing plate 53a is one piece of ring flat-plate, now the ring flat-plate is installed on away from measurement
At device portal on the position in one section of downstream, and the spacing of 1-6 millimeters is left and the bottom of pipeline 2 between.
Described despinner 52 is one group of flat board arranged with the diameter parallel of inner tube 12.These flat boards are inner tube back segment
The inner space of 12b is separated into the small flow channels that some circulation areas are equal or are distributed symmetrically.
The measuring method of the high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type in pipe described above：Work as height
When void fraction gas-liquid two-phase fluid the past dividing plate 53a enters inner tube 12, under gravity, a part for liquid film 8 passes through inner tube
Through hole or slot 15 on 12 is fallen in mezzanine space 14, and remaining liquid film 8 can flow through the first cyclone in gas-liquid two-phase fluid
Enter in mezzanine space 14 under produced centrifugal action when 16；Gas-liquid two-phase fluid after liquid film is excluded flows through the second rotation
During stream device 22, rotation is further strengthened, and disperses larger drop 6 be in the gas flow driven to inner tube 12 by centrifugal force
On inwall, entered in mezzanine space 14 by through hole or slot 15 then；When the only swirling eddy containing fine liquid particles is by gradually
During the draw 32, radius of turn significantly reduces, and according to law of conservation of moment of momentum, now the rotary speed of air-flow can be obtained significantly
Improve, in the presence of powerful centrifugal force, disperse fine drop in the gas flow be thrown on wall in cyclone pipe 34, shape
Into one layer of very thin liquid film, or converge in a very thin boundary region of near wall, this layer of liquid film is together with a small amount of gas
Can flow in mezzanine space 14 from the gap 39 between 36 outer wall of inwall and transition conduit of cyclone pipe 34 by inertia；Its Yugan
Gas is then entered in increaser 38 by transition conduit 36；Gas in inner tube 12 is in addition to can be from 34 inwall of cyclone pipe with transition conduit 36
Gap 39 between wall is entered outside mezzanine space 14, also can be flowed with the through hole of liquid film 8 and drop 6 from inner tube or slot 15
Enter in mezzanine space 14；By the size for adjusting air seal component 17a, 17b and gap 39, it becomes possible to which control is into mezzanine space 14
This portion gas flow；In mezzanine space 14, liquid film and drop fall under gravity into the first declining liquid tube 18,
In two declining liquid tubes 26 or the 3rd declining liquid tube 28, gas then carries a small amount of fine drop in small-sized typical separators 45, passes through
After 45 dehumidification of small-sized typical separators, dry gas is flowed in central canal 24 through muffler 46, then in transition conduit 36 and eddy flow
Dry gas in pipe 34 converges, further with after the boosting of 38 reduction of speed of increaser and 52 rectification of despinner, by gas flowmeter 54
Its flow is measured, inner tube back segment 12b is finally flowed out, is returned in pipeline 2；From the first declining liquid tube 18, the second declining liquid tube 26 and the 3rd
Three strands of liquid of declining liquid tube 28 are first come together in the first declining liquid tube 18, then enter liquid measure pipe 27 from its bottom, are passed through
Regulating valve 57 measures its flow by fluid flowmeter 56 after controlling, and in last flow ipe 2, and flows out from inner tube back segment 12b
Dry gas converges, and together flows out flow measurement device.
Compared to the prior art compared with, the invention has the advantages that：
The present invention is divided into four steps and completes gas-liquid two-phase fluid being kept completely separate in pipeline.The first step, by gravity and suitable
When centrifugal force first pipeline in the liquid film 8 of self-assembling formation isolate with air-flow；Second step, by applying centrifugal force to two phase flow
Idetified separation is acted on, and larger-size drop 4 is driven on tube wall and is formed liquid film and is isolated with air-flow；3rd step, passes through
Further strengthen centrifugal force to isolate drop 6 tiny in air-flow；4th step, adjoint liquid film 8 and liquid in isolation processes
A small amount of gas of drop 6 is separated, and is returned it in gasmetry pipeline, completes gas-liquid two-phase fluid in pipeline
It is kept completely separate.Just can respectively with single-phase flow flowmeter measurement gas and the stream of liquid after gas-liquid two-phase fluid is realized being kept completely separate
Amount.
To complete above-mentioned separation process, the main isolating device that the present invention is adopted includes：Pipeline, is arranged at interior in pipeline
Pipe, through hole and slot in inner tube and the dividing plate in front and back for fixing inner tube.Using idetified separation element include：Two-stage
Cyclone, reducing pipe and cyclone pipe.These elements both can be driven to the drop in air-flow on wall and form liquid film or restriction
In the very thin boundary region of near wall, while produced centrifugal force also contributes to realize mutually separating.In order to more effectively real
Now mutually separate, in segmentation procedures, need a small amount of gas with liquid film and drop together into the pooling zone of liquid.These gases
Addition be both inevitable, while the efficiency of whole piece-rate system can also be improved.But in order to complete biphase gas and liquid flow
Body being kept completely separate in pipe, finally from adjoint liquid must also separate these gases, and return to gas
In bulk measurement pipeline.As their amount is relatively fewer, and one can be gone out by separation by gravity in mezzanine space
Point, therefore the present invention is only provided with small-sized typical separators of the diameter less than or equal to pipe diameter, and be attached thereto logical
Muffler, central canal and fluid return passageway.Finally, the device for completing gas and liquid flow measurement includes a gas
With a fluid flowmeter, despinner and level gauging and adjusting means.
In a word, the present invention is by using phase isolation technique in pipe, coordinating centrifugation and gravity fractionation, through multiple separation
Step completes gas-liquid two-phase fluid being kept completely separate in pipeline, so as to significantly reduce partition method class gas-liquid two-phase flow measurement dress
The volume put, improves the real-time of measurement, and significantly reduces manufacturing cost, in order to extensively apply in engineering.
Description of the drawings
When Fig. 1 is high void fraction (gas volume fraction is more than 90%), flow pattern of the gas-liquid two-phase fluid in horizontal pipe is illustrated
Figure；Wherein：Figure 1A is the bottom schematic view that (be less than 4-6 meter per seconds) liquid film is deposited on pipeline when flow velocity is relatively low, and Figure 1B enters for flow velocity
The schematic diagram of liquid film forming semicircular stream when one step increases, Fig. 1 C are the schematic diagram of liquid film forming ring-type when flow velocity is higher.
Fig. 2 is the structural representation of the flow measurement device of the high void fraction gas-liquid two-phase fluid of the present invention, wherein arrowSign represents the flow direction of fluid.
Fig. 3 is the partial enlarged drawing of cyclone pipe 34 and both junctions of transition conduit 36.
Fig. 4 is another kind of version for separating interval I.
Specific embodiment
The present invention will be described in more detail below in conjunction with the accompanying drawings.
Accompanying drawing 1 is the result of study according to current two phase flow, such as Mandhane flow patterns, and the gas-liquid two-phase fluid of drafting exists
Fluidised form schematic diagram during high void fraction (gas volume fraction is more than 90%) in the horizontal tube.(the figure in the form of continuous state of gas 01
Middle blank parts) it is distributed in pipeline 2, and liquid is then present in pipeline 2 with three kinds of forms：With fine drop 4 (micron order and
It is dispersed in below) in gas, is suspended in air-flow with larger drop 6 (grade) and is close on tube wall with continuous liquid film 8.
Liquid film 8 can be deposited on the bottom (accompanying drawing 1, A) of pipeline 2 (to be less than 4-6 meter per seconds) when flow velocity is relatively low, (big when flow velocity further increases
In equal to 6-12 meter per seconds), semicircular stream (accompanying drawing 1, B) is formed, when flow velocity is higher, (is more than 12-16 meter per seconds), liquid film 8 can be formed
Ring-type (accompanying drawing 1, C).When pipeline 2 is disposed vertically, as stress is symmetrical, the distribution form of liquid is similar to accompanying drawing 1 (C), but
The thickness of liquid film 8 circumferentially can be more evenly.
As shown in Fig. 2 the high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type in a kind of pipe of the present invention, including
Pipeline 2, the inner tube 12 being fixed on 2 inwall of pipeline by front dividing plate 53a and rear bulkhead 53b, inwall and the inner tube 12 of pipeline 2
A mezzanine space 14 is kept between outer wall, streamwise, said inner tube 12 include being sequentially communicated and coaxial inner tube leading portion
12a, reducing pipe 32, cyclone pipe 34, transition conduit 36, increaser 38 and inner tube back segment 12b, are provided with inner tube leading portion 12a
One cyclone 16 and the second cyclone 22, are provided with despinner 52 and gas flowmeter 54 in inner tube back segment 12b；Said inner tube
Through hole or slot 15 are distributed with 12 tube wall；A central canal 24, the entrance of the central canal 24 are included in inner tube 12 also
Outlet with the muffler 46 being arranged at the top of pipeline 2 is connected, and the outlet of central canal 24 is connected with transition conduit 36, muffler
46 entrance is connected with the top of the small-sized typical separators 45 of the connection of mezzanine space 14 with being arranged at the top of pipeline 2；Institute
The bottom for stating pipeline 2 is disposed with and the first declining liquid tube 18 for being connected with mezzanine space 14, the second declining liquid tube the 26, the 3rd are fallen liquid
Pipe 28 and liquid measure pipe 29,18 bottom of the first declining liquid tube are connected with the entrance of liquid measure pipe 29,26 He of the second declining liquid tube
3rd declining liquid tube 28 is by connecting communicating pipe 27, and is connected with the side of the first declining liquid tube 18 by communicating pipe 27, first
Liquidometer 58 is installed in declining liquid tube 18, regulating valve 57 and fluid flowmeter 56, the tune are installed on liquid measure pipe 29
Section valve 57 and liquidometer 58 are connected by control signal wire 59.
As the preferred embodiment of the present invention, the aperture of the through hole being distributed on the tube wall of said inner tube 12 or slot 15
Width it is following but be not less than 2 millimeters for one of percentage of 2 internal diameter of pipeline.
Used as the preferred embodiment of the present invention, the bottom of the small-sized typical separators 45 is provided with gas averaging board 42 and whirlpool
Impeller blade 43, top are provided with waveform board component 44；Diameter of the diameter of small-sized typical separators 45 less than or equal to pipeline 2.
It is as the preferred embodiment of the present invention, the central canal 24 and pipeline 2, inner tube 12, the second cyclone 24, tapered
Pipe 32, cyclone pipe 34 and transition conduit 36 are co-axially mounted, and pass through from their center.
Used as the preferred embodiment of the present invention, the diameter of first declining liquid tube 18 is less than or equal to the diameter of pipeline 2,
The diameter of the second declining liquid tube 26 and the 3rd declining liquid tube 28 less than the diameter of pipeline 2 1/3rd.
As the preferred embodiment of the present invention, it is provided with described jacket space 14 and is fixed on 2 inwall of pipeline
First ring flat-plate 17b, is additionally provided with the second ring flat-plate 17a being fixed on 12 outer wall of inner tube, wherein being fixed on 12 outer wall of inner tube
The gap and the first ring flat-plate 17b inner edges being fixed on 2 inwall of pipeline and inner tube of the second ring flat-plate 17a outer rims and 2 inwall of pipeline
The gap of 12 outer walls is 1～5mm, along conduit axis direction, the first ring flat-plate 17b and the second ring flat-plate 17a interlaced arrangements, forms sealing gland
Component.
As the preferred embodiment of the present invention, as shown in figure 3, internal diameter of the external diameter of the transition conduit 36 than cyclone pipe 34
Little 1～6mm, and arrival end 37 stretches at least 50mm in cyclone pipe 34, and the port of export is connected with increaser 38, outside transition conduit 36
Wall forms a gap 39 with the inwall of cyclone pipe 34.
Used as the preferred embodiment of the present invention, first cyclone 16 and the second cyclone 22 are by 4～8 helical-blades
Piece is formed around a central shaft, and helical blade is an entirety with central shaft, and the inwall of helical blade outer rim and inner tube 12
It is in close contact, it is very close to each other；Blade screw angle 2 ° of the blade screw angle of the first cyclone 16 at least above the second cyclone 22.
Used as the preferred embodiment of the present invention, described reducing pipe 32 is a conical tube, and its inlet diameter is more than
Mouth diameter, the angle between its inwall and axis is 10 °～23 °.
Used as the preferred embodiment of the present invention, described cyclone pipe 34 is one section of pipe, its length be its internal diameter 1～
4 times.
Used as the preferred embodiment of the present invention, described increaser 38 is a conical tube, and its inlet diameter is less than outlet
Diameter, its inwall are 2 °～8 ° with the angle of axis.
As the preferred embodiment of the present invention, as shown in Fig. 2 described front dividing plate 53a is a conical tube, survey is installed on
The porch of amount device, upstream one end are connected with the inwall of pipeline 2, and downstream one end is connected with inner tube 12；Or such as Fig. 4 institutes
Show, front dividing plate 53a is one piece of ring flat-plate, now the ring flat-plate is installed on the position in one section of measurement apparatus porch downstream, and
The spacing of 1-6 millimeters is left and the bottom of pipeline 2 between, front demarcation strip 53a downstream moves one from the arrival end of inner tube 12
Segment distance, allows liquid film 8 to flow directly in mezzanine space 14.Now foot is left between front demarcation strip 53a and the bottom of pipeline 2
Enough gaps, to ensure that liquid film passes through.
Used as the preferred embodiment of the present invention, described despinner 52 is the diameter parallel arrangement of a group and inner tube 12
Flat board.The inner space of inner tube back segment 12b is separated into these flat boards the small flow channels that some circulation areas are equal or are distributed symmetrically.
The measuring method of the high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type in pipe described above：This
Bright four steps that are divided into complete gas-liquid two-phase fluid being kept completely separate in pipeline, and four steps are respectively in I, II, the III shown in Fig. 2
Separate with the correspondence of IV and complete in interval.As shown in Figure 2, when high void fraction gas-liquid two-phase fluid the past dividing plate 53a enters interior
During pipe 12, under gravity, a part for liquid film 8 falls into mezzanine space 14 by the through hole or slot 15 in inner tube 12
In, interlayer is entered under the centrifugal action that remaining liquid film 8 can be produced when gas-liquid two-phase fluid flows through the first cyclone 16 empty
Between in 14；When gas-liquid two-phase fluid after liquid film is excluded flows through the second cyclone 22, rotation is further strengthened, and disperses
Larger drop 6 in the gas flow can be driven on the inwall of inner tube 12 by centrifugal force, entered by through hole or slot 15 then
In mezzanine space 14；When only the swirling eddy containing fine liquid particles passes through reducing pipe 32, radius of turn significantly reduces, according to momentum
Square conservation law, now the rotary speed of air-flow can be greatly enhanced, in the presence of powerful centrifugal force, be dispersed in gas
Fine drop in stream can be thrown on wall in cyclone pipe 34, formed one layer of very thin liquid film, or converged near wall
A very thin boundary region in, as shown in figure 3, this layer of liquid film together with a small amount of gas can by inertia from cyclone pipe 34
Flow in mezzanine space 14 in gap 39 between 36 outer wall of wall and transition conduit；Remaining dry gas then enters flaring by transition conduit 36
In pipe 38；Gas in inner tube 12 is empty except entering interlayer from the gap 39 between 36 outer wall of 34 inwall of cyclone pipe and transition conduit
Between outside 14, also can enter in mezzanine space 14 with the through hole of liquid film 8 and drop 6 from inner tube or 15 stream of slot；By adjusting
Air seal component 17a, 17b and the size in gap 39, it becomes possible to flow of the control into this portion gas of mezzanine space 14；In folder
In sheaf space 14, liquid film and drop fall under gravity into the first declining liquid tube 18, the second declining liquid tube 26 or the 3rd declining liquid tube
In 28, gas then carries a small amount of fine drop in small-sized typical separators 45, after 45 dehumidification of small-sized typical separators,
Dry gas is flowed in central canal 24 through muffler 46, is then converged with the dry gas in cyclone pipe 34 in transition conduit 36, Zai Yitong
After the boosting of 38 reduction of speed of increaser and 52 rectification of despinner, its flow is measured by gas flowmeter 54, inner tube is finally flowed out
Back segment 12b, returns in pipeline 2；First converge from three strands of liquid of the first declining liquid tube 18, the second declining liquid tube 26 and the 3rd declining liquid tube 28
Combine in the first declining liquid tube 18, then liquid measure pipe 27 is entered from its bottom, by fluid flow after regulating valve 57 is controlled
Meter 56 measures its flow, in last flow ipe 2, converges with the dry gas flowed out from inner tube 12, together flows out flow measurement device.
Claims (10)
1. the high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type in a kind of pipe, including pipeline (2), by front dividing plate
(53a) inner tube (12) being fixed on pipeline (2) inwall with rear bulkhead (53b), the inwall of pipeline (2) and the outer wall of inner tube (12)
Between keep a mezzanine space (14), streamwise, said inner tube (12) is including being sequentially communicated and coaxial inner tube leading portion
(12a), reducing pipe (32), cyclone pipe (34), transition conduit (36), increaser (38) and inner tube back segment (12b), in inner tube leading portion
(12a) the first cyclone (16) and the second cyclone (22) are provided with, despinner (52) are provided with inner tube back segment (12b)
With gas flowmeter (54)；It is characterized in that：Through hole or slot (15) are distributed with the tube wall of said inner tube (12)；Inner tube
(12) central canal (24), entrance and the muffler being arranged at the top of pipeline (2) of the central canal (24) are also included in
(46) outlet is connected, and the outlet of central canal (24) is connected with transition conduit (36), the entrance of muffler (46) be arranged on
It is connected at the top of the small-sized typical separators (45) connected with mezzanine space (14) at the top of pipeline (2)；In the pipeline (2)
Bottom be disposed with and connect with mezzanine space (14) the first declining liquid tube (18), the second declining liquid tube (26), the 3rd declining liquid tube
(28) and liquid measure pipe (29), the first declining liquid tube (18) bottom is connected with the entrance of liquid measure pipe (29), and second falls liquid
Pipe (26) is connected by communicating pipe (27) with the 3rd declining liquid tube (28), and passes through the side of communicating pipe (27) and the first declining liquid tube (18)
Face is connected, and is provided with liquidometer (58), is provided with regulating valve on liquid measure pipe (29) in the first declining liquid tube (18)
(57) and fluid flowmeter (56), the regulating valve (57) and liquidometer (58) are connected by control signal wire (59).
2. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：The aperture of the through hole being distributed on the tube wall of said inner tube (12) or the width of slot (15) are pipeline (2) internal diameter
One of percentage it is following but be not less than 2 millimeters.
3. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：The central canal (24) and pipeline (2), inner tube (12), the second cyclone (24), reducing pipe (32), cyclone pipe
(34) it is co-axially mounted with transition conduit (36), and passes through from their center.
4. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：Diameter of the diameter of first declining liquid tube (18) less than or equal to pipeline (2), the second declining liquid tube (26) and the 3rd
The diameter of declining liquid tube (28) less than the diameter of pipeline (2) 1/3rd.
5. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：The first ring flat-plate (17b) being fixed on pipeline (2) inwall is provided with described mezzanine space (14), is also set up
There is the second ring flat-plate (17a) being fixed on inner tube (12) outer wall, wherein the second ring flat-plate (17a) being fixed on inner tube (12) outer wall
The gap and the first ring flat-plate (17b) inner edge being fixed on pipeline (2) inwall and inner tube (12) of outer rim and pipeline (2) inwall is outward
The gap of wall is 1～5mm, along conduit axis direction, the first ring flat-plate (17b) and the second ring flat-plate (17a) interlaced arrangement, forms sealing gland
Component.
6. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：External diameter 1～the 6mm less than the internal diameter of cyclone pipe (34) of the transition conduit (36), and arrival end (37) stretches into rotation
At least 50mm in flow tube (34), the port of export are connected with increaser (38), the outer wall of transition conduit (36) and the inwall of cyclone pipe (34)
Form a gap (39).
7. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：First cyclone (16) and the second cyclone (22) are by 4～8 helical blades around a central shaft
Into helical blade is an entirety with central shaft, and helical blade outer rim is in close contact with the inwall of inner tube (12), between not having
Gap；Blade screw angle 2 ° of the blade screw angle of the first cyclone (16) at least above the second cyclone (22).
8. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：Described front dividing plate (53a) is a conical tube, is installed on the porch of measurement apparatus, upstream one end and pipeline (2)
Inwall be connected, downstream one end is connected with inner tube (12)；Or front dividing plate (53a) is one piece of ring flat-plate, now the ring flat-plate is installed
In on the position in one section of measurement apparatus porch downstream, and the spacing of 1-6 millimeters is left and the bottom of pipeline (2) between.
9. one kind according to claim 1 manages the high void fraction gas-liquid two-phase fluid flow measurement device of interior phase cellular-type, its
It is characterised by：Described despinner (52) is one group of flat board arranged with the diameter parallel of inner tube (12)；These flat boards are by inner tube
The inner space of back segment (12b) is separated into the small flow channels that some circulation areas are equal or are distributed symmetrically.
10. using the measurement of the high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type in the pipe described in claim 1
Method：It is characterized in that：When high void fraction gas-liquid two-phase fluid the past dividing plate (53a) is into inner tube (12), in action of gravity
Under, a part for liquid film (8) is fallen in mezzanine space (14) by the through hole or slot (15) in inner tube (12), remaining liquid film
(8) mezzanine space (14) is entered under centrifugal action that can be produced when gas-liquid two-phase fluid flows through the first cyclone (16)
In；When gas-liquid two-phase fluid after liquid film is excluded flows through the second cyclone (22), rotation is further strengthened, and is dispersed in
Larger drop (6) in air-flow can be driven on the inwall of inner tube (12) by centrifugal force, then by through hole or slot (15)
Into in mezzanine space (14)；When only the swirling eddy containing fine liquid particles passes through reducing pipe (32), radius of turn significantly reduces,
According to law of conservation of moment of momentum, now the rotary speed of air-flow can be greatly enhanced, in the presence of powerful centrifugal force,
Dispersion fine drop in the gas flow can be thrown on wall in cyclone pipe (34), formed one layer of very thin liquid film, or converged
In a very thin boundary region of near wall, this layer of liquid film can rely on inertia from cyclone pipe (34) together with a small amount of gas
Flow in mezzanine space (14) in gap (39) between inwall and transition conduit (36) outer wall；Remaining dry gas then passes through transition conduit
(36) in increaser (38)；Gas in inner tube (12) except can from cyclone pipe (34) inwall and transition conduit (36) outer wall it
Between gap (39) into mezzanine space (14) outward, also can be with liquid film (8) and drop (6) through hole or slot from inner tube
(15) stream enters in mezzanine space (14)；By the size for adjusting air seal component (17a), (17b) and gap (39), it becomes possible to control
Into the flow of this portion gas of mezzanine space (14)；In mezzanine space (14), liquid film and drop are under gravity
Fall in the first declining liquid tube (18), the second declining liquid tube (26) or the 3rd declining liquid tube (28), gas then carries a small amount of fine drop and enters
Enter in small-sized typical separators (45), after small-sized typical separators (45) dehumidification, dry gas is in muffler (46) inflow
In heart pipe (24), then converge with the dry gas in cyclone pipe (34) in transition conduit (36), further with through increaser (38) drop
After speed boosting and despinner (52) rectification, its flow is measured by gas flowmeter (54), finally flow out inner tube (12), return to pipe
In road (2)；The three strands of liquid come from the first declining liquid tube (18), the second declining liquid tube (26) and the 3rd declining liquid tube (28) first come together in the
In one declining liquid tube (18), then liquid measure pipe (27) is entered from its bottom, by fluid flow after regulating valve (57) control
Meter (56) is measured in its flow, last flow ipe (2), is converged with the dry gas flowed out from inner tube (12), and together flowing out stream is measured
Amount device.
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| CN201410276592.XA CN104075766B (en) | 2014-06-19 | 2014-06-19 | The high void fraction gas-liquid two-phase fluid flow measurement device of phase cellular-type and method in pipe |
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| CN104075766B true CN104075766B (en) | 2017-03-29 |
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