CN104075766A - Pipe internal-phase separation type high-gas-containing-rate gas-liquid two-phase fluid flow measurement device and method - Google Patents
Pipe internal-phase separation type high-gas-containing-rate gas-liquid two-phase fluid flow measurement device and method Download PDFInfo
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Abstract
Disclosed is a pipe internal-phase separation type high-gas-containing-rate gas-liquid two-phase fluid flow measurement device and method. The pipe internal-phase separation type high-gas-containing-rate gas-liquid two-phase fluid flow measurement device is mainly formed by a pipe, an inner pipe, a two-stage cyclone, a reducing pipe, a cyclone pipe, a transition pipe, an increasing pipe, a cyclone elimination device, a small conventional separator, a gas flow meter and a liquid flow meter. A pipe internal-phase separation technology is adopted in the pipe internal-phase separation type high-gas-containing-rate gas-liquid two-phase fluid flow measurement method and matched with the gravity and centrifugal separation effect, the complete separation of the gas-liquid two-phase fluid in the pipe is achieved through a plurality of separation steps, and the flow rate of a gas phase and the flow rate of a liquid phase are measured through the gas flow meter and the liquid flow meter respectively. According to the pipe internal-phase separation type high-gas-containing-rate gas-liquid two-phase fluid flow measurement device and method, the size of a separation method type gas-liquid two-phase flow measurement device can be greatly reduced, the real-time performance of the measurement is improved, the manufacturing cost can be significantly reduced, and the pipe internal-phase separation type high-gas-containing-rate gas-liquid two-phase fluid flow measurement device and method can be convenient for wide application to the engineering.
Description
Technical field
The invention belongs to flow measurement technology field, be specifically related to phase cellular-type high void fraction gas-liquid two-phase fluid flow measurement device and method in a kind of pipe.
Background technology
" phase " in the present invention refers to the identical each several part of physical property in heterogeneous fluid, as gas phase, liquid phase, oil phase, water etc.Wherein gas phase and liquid phase can be both one-component materials, can be also the homogeneous mixtures of multi-component material, as air, and former wet goods.In pipe, separate mutually and refer to each is converged respectively to isolation mutually to a specific region in pipeline, so that final, realize completely separated process.In two-phase flow measurement technology, partition method remains the most reliable and the highest technology of precision at present.Because this method is that gas-liquid two-phase fluid is separated into after single phase gas and liquid, use respectively again each phase flow rate of single-phase flow flowmeter measurement, as many as multiphase flow metering has been changed into single-phase flow metering, thereby can avoid the factors such as variations in flow patterns and flowing instability on the impact of measuring, also just exempted the immense engineering of setting up special polyphasic flow calibration system and corresponding transmission of quantity value system simultaneously.As US Patent No. 4688418 " Method and apparatus for determing mass flow rate and quality in a steam line ", a kind of steam flow dryness measurement system of using cyclone separator is disclosed.But that the disadvantage of these class methods is equipment is huge, cost is high, automatic control system is complicated, and the real-time of measuring is poor.These shortcomings have seriously limited its widespread use in engineering.In order to dwindle the volume of separation vessel, improve measurement characteristics, people have carried out a lot of trials, as US Patent No. 6128962 " Three-phase fluid flow measurement system and method ", disclose a kind of three-phase flow measurement mechanism that uses small-sized separation vessel.This method is also referred to as part partition method (partial separation), therefrom can find out, the size of separation vessel has been dwindled really, but but sacrificed separation efficiency, three-phase flow thoroughly can not be separated into single-phase flow, thereby affected measuring accuracy, must increase some correction meanss for this reason.US Patent No. 5390547 " Multiphase flow separation and measurement system " and US7311001 " Multiphase flow measurement apparatus and method " disclose respectively a kind of multiphase flow measuring device, attempt need not be special separation equipment, only utilize heterogeneous fluid pipeline itself to form a kind of piece-rate system.On the surface, this system has saved traditional separation vessel really, but due to adopted pipe diameter and length dimension all very large, and used external cyclonic separation mode, therefore it and the traditional not tangible difference of partition method in fact.Chinese patent ZL98113068.2 discloses a kind of shunting split-phase type measuring method.By adopting proportional shunting means, the actual flow that enters separation vessel is greatly reduced, thereby reduced at double the volume of required separation vessel.But in use can run into a difficulty, when the liquid phase in two-phase flow or the flow of gas phase very little (high void fraction or low air void), owing to having passed through shunting, thereby just less from liquid phase or the gas phase flow rate of separation vessel outflow, to such an extent as to lower than the measurement lower limit of existing minimum flow meter, cause measuring difficulty, even cannot measure.
Summary of the invention
The deficiency existing in order to overcome above-mentioned prior art, the object of the present invention is to provide phase cellular-type high void fraction gas-liquid two-phase fluid flow measurement device and method in a kind of pipe, phase isolation technique in managing by employing, coordinate centrifugal and gravity fractionation, through a plurality of separating steps, complete the complete separation of gas-liquid two-phase fluid in pipeline, thereby significantly dwindle the volume of partition method class gas-liquid two-phase flow measuring apparatus, improve the real-time of measuring, and significantly reduce manufacturing cost, so that widespread use in engineering.
In order to illustrate better technical scheme of the present invention, below first brief analysis biphase gas and liquid flow nowed forming in pipe (flow pattern) when high void fraction once.
Gas 01 is distributed in pipeline 2 with the form (figure empty part) of continuous state, liquid is present in pipeline 2 with three kinds of forms: with fine drop 4 (micron order and following), be dispersed in gas, be suspended in air-flow neutralization be close on tube wall with continuous liquid film 8 with larger drop 6 (grade).Liquid film 8 can be deposited on the bottom of pipeline 2 when flow velocity is lower, (to be less than 4-6 meter per second), when flow velocity further increases, (is more than or equal to 6-12 meter per second), forms semicircular stream, when flow velocity is higher, (is greater than 12-16 meter per second), and liquid film 8 can form ring-type.When pipeline 2 vertical placement, due to stressed symmetry, it is similar that the distribution form of liquid forms ring-type when higher to horizontal tube flow velocity, but the thickness of liquid film 8 circumferentially can be more even.Hence one can see that, and when high void fraction gas-liquid two-phase fluid flows in pipeline, liquid can not be dispersed into minimum drop and evenly be blended in air-flow, forms so-called mist flow; On the contrary, always have a kind of stronger spontaneous separation trend: drop can aggregate into liquid film, and minute bubbles can be merged into air pocket in flow process between two-phase fluid, gas and liquid all can spontaneously collect to specific region respectively.But on the other hand, in flow process, between gas phase and liquid phase, really also can mutually mix, cause the liquid film being deposited on tube wall can again be involved in air-flow by gas at any time.Flow velocity is higher, and the density difference between gas-liquid is less, and this immixture is just more obvious.In fact in whole flow process, together with separation is always accompanied with mixing, their can be issued to different mobile equilibrium in different conditions.In conventional separators, be mainly to utilize centrifugal force that liquid is driven to and on barrel, forms liquid film, and then utilize gravity that it is finally separated.For fear of air-flow, again sweep away established liquid film (secondary carries), generally all can strictly control the axial flow velocity in separator cartridge in design.As long as axial flow velocity is enough low, this secondary carries just very faint.According to design experiences, this critical flow velocity is 0.1 meter per second～4 meter per second, the normal flow far below gas-liquid two-phase fluid in pipeline.Therefore the diameter of separation vessel is general always than large several times of the pipe diameter being attached thereto.The main cause that separation vessel size that Here it is is difficult to reduce.
As can be seen from the above analysis, separated and mixing is simultaneous conflict, and both are all the time in a kind of mobile equilibrium.If can be in time by the liquid film of having separated and air-flow isolation in this dynamic process, balance will be constantly towards separated future development, until liquid all in air-flow is all separated clean so.Therefore as conventional separators, for fear of secondary, carry and increase simply the diameter (reducing axial flow velocity) of separator cartridge, just realize a kind of effective ways of gas-liquid separation, but be not unique method, also be never a necessary condition, moreover according to the formula (a=V of centrifugal acceleration
2/ R, V is tangential flow velocity, the radius that R is separator cartridge), increase separator cartridge radius R and also can reduce centrifugal acceleration simultaneously, directly affect separating effect, so, the separation method that traditional partition method can not be best at last.As long as the mobile equilibrium between in fact impelling separation and mixing is constantly towards separated future development, gas-liquid two-phase fluid also can be realized complete separation in pipeline, and because diameter is little, centrifugal force can be larger, thereby be also more conducive to strengthen centrifugation.The present invention forms according to this thinking.
The present invention adopts following technical scheme:
The high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe, comprise pipeline 2, by front dividing plate 53a and rear bulkhead 53b, be fixed on the inner tube 12 on pipeline 2 inwalls, between the outer wall of the inwall of pipeline 2 and inner tube 12, keep a mezzanine space 14, streamwise, described inner tube 12 comprises and being communicated with successively and coaxial inner tube leading portion 12a, reducer 32, cyclone pipe 34, transition conduit 36, increaser 38 and inner tube back segment 12b, in inner tube leading portion 12a, be provided with the first cyclone 16 and the second cyclone 22, in inner tube back segment 12b, be provided with despinner 52 and gas meter 54, on the tube wall of described inner tube 12, be distributed with through hole or slot 15, in inner tube 12, also comprise a pipe core 24, the entrance of described pipe core 24 is connected with the outlet that is arranged on the muffler 46 at pipeline 2 tops, the outlet of pipe core 24 is connected with transition conduit 36, and the entrance of muffler 46 is connected with the top that is arranged on the small-sized conventional separation vessel 45 that pipeline 2 tops and mezzanine space 14 be communicated with, the first declining liquid tube 18, the second declining liquid tube 26, the 3rd declining liquid tube 28 and the liquid measure pipe 29 that in the bottom of described pipeline 2, are disposed with and are communicated with mezzanine space 14, the first declining liquid tube 18 bottoms are connected with the entrance of liquid measure pipe 29, and the second declining liquid tube 26 and the 3rd declining liquid tube 28 were communicated with by communicating pipe 27, and were connected by the side of communicating pipe 27 and the first declining liquid tube 18, in the first declining liquid tube 18, liquid level gauge 58 is installed, variable valve 57 and liquid flowmeter 56 are installed on liquid measure pipe 29, and described variable valve 57 is connected by control signal wire 59 with liquid level gauge 58.
The width of the aperture of the through hole distributing on the tube wall of described inner tube 12 or slot 15 is below one of percentage of pipeline 2 internal diameters but is not less than 2 millimeters.
Described pipe core 24 is coaxially installed with pipeline 2, inner tube 12, the second cyclone 24, reducer 32, cyclone pipe 34 and transition conduit 36, and passes from their center.
The diameter of described the 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 be no more than pipeline 2 diameter 1/3rd.
In described chuck space 14, be provided with the first ring flat-plate 17b being fixed on pipeline 2 inwalls, also be provided with the second ring flat-plate 17a being fixed on inner tube 12 outer walls, wherein be fixed on the gap of the second ring flat-plate 17a outer rim on inner tube 12 outer walls and pipeline 2 inwalls and be fixed on the first ring flat-plate 17b inner edge on pipeline 2 inwalls and the gap of inner tube 12 outer walls is 1～5mm, along conduit axis direction, the first ring flat-plate 17b and the second ring flat-plate 17a alternative arrangement, form air seal component.
The external diameter of described transition conduit 36 is than the little 1～6mm of the internal diameter of cyclone pipe 34, and inlet end 37 stretches in cyclone pipe 34 at least 50mm, and endpiece is connected with increaser 38, and the inwall of the outer wall of transition conduit 36 and cyclone pipe 34 forms a gap 39.
Described the first cyclone 16 and the second cyclone 22 are formed around a central shaft by 4～8 helical blades, and helical blade and central shaft are as a whole, and the inwall close contact of helical blade outer rim and inner tube 12 is very close to each other; The blade screw angle of the first cyclone 16 is at least greater than 2 °, the blade screw angle of the second cyclone 22.
Described front dividing plate 53a is a conical tube, is installed on the porch of measurement mechanism, and one end, upstream is connected with the inwall of pipeline 2, and one end, downstream is connected with inner tube 12; Or front dividing plate 53a is a ring flat-plate, now this ring flat-plate is installed on Yi Duan position, downstream, measurement mechanism porch, and and the bottom of pipeline 2 between leave the spacing of 1-6 millimeter.
Described despinner 52 is one group of flat board that the axis with inner tube 12 is arranged in parallel.These flat boards are separated into the inner space of inner tube back segment 12b the small flow channels that some circulation areas equate or are distributed symmetrically.
The measuring method of the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in pipe described above: when high void fraction gas-liquid two-phase fluid is when dividing plate 53a enters inner tube 12 in the past, under Action of Gravity Field, a part for liquid film 8 falls into mezzanine space 14 by the through hole in inner tube 12 or slot 15, under the centrifugal action that all the other liquid films 8 can produce when gas-liquid two-phase fluid flows through the first cyclone 16, enters in mezzanine space 14; When the gas-liquid two-phase fluid after getting rid of liquid film flows through the second cyclone 22, rotation is further strengthened, be dispersed in larger drop 6 in air-flow and can be centrifuged on the inwall that power is driven to inner tube 12, then by through hole or slot 15, enter in mezzanine space 14; When only containing the swirling eddy of fine liquid particles during by reducer 32, radius of turn is significantly dwindled, according to law of conservation of moment of momentum, now the rotational speed of air-flow can be greatly enhanced, under the effect of powerful centrifugal force, the fine drop being dispersed in air-flow can be thrown on wall in cyclone pipe 34, form very thin one deck liquid film, or converge near very thin boundary layer wall, this layer of liquid film can rely on inertia to flow in mezzanine space 14 from the inwall of cyclone pipe 34 and the gap 39 between transition conduit 36 outer walls together with a small amount of gas; All the other dry gas enter in increaser 38 by transition conduit 36; Gas in inner tube 12 enters mezzanine space 14 except the gap 39 of meeting between cyclone pipe 34 inwalls and transition conduit 36 outer walls, also can follow liquid film 8 and drop 6 through hole or the slot 15 inner tube to flow in mezzanine space 14; By regulating the size in air seal component 17a, 17b and gap 39, just can control the flow of this part gas that enters mezzanine space 14; In mezzanine space 14, liquid film and drop fall under gravity in the first declining liquid tube 18, the second declining liquid tube 26 or the 3rd declining liquid tube 28, gas carries a small amount of fine drop and enters in small-sized conventional separation vessel 45, after small-sized conventional separation vessel 45 dehumidifications, dry gas flows in pipe core 24 through muffler 46, then the dry gas in transition conduit 36 and in cyclone pipe 34 converges, together through increaser 38 reductions of speed, boost again and despinner 52 rectifications after, by gas meter 54, measure its flow, finally flow out inner tube back segment 12b, get back in pipeline 2; 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, first come together in the first declining liquid tube 18, then from its bottom, enter liquid measure pipe 27, after controlling, variable valve 57 measures its flow by liquid flowmeter 56, in last flow ipe 2, converge with the dry gas flowing out from inner tube back segment 12b, together flow out flow measurement device.
Compared to the prior art, tool of the present invention has the following advantages:
The present invention is divided into four steps and completes the complete separation of gas-liquid two-phase fluid in pipeline.The first step, by gravity and suitable centrifugal force first in pipeline, liquid film 8 and the air-flow of self-assembling formation are isolated; Second step, by two-phase flow being applied to centrifugal force strengthening centrifugation, is driven to larger-size drop 4 on tube wall, to form liquid film isolated with air-flow; The 3rd step, isolates drop tiny in air-flow 6 by further reinforcement centrifugal force; The 4th step, following a small amount of gas of liquid film 8 and drop 6 to separate in isolation processes, and returns it in gasmetry pipeline and goes, and completes the complete separation of gas-liquid two-phase fluid in pipeline.After realizing separation completely, gas-liquid two-phase fluid just can use respectively the flow of single-phase flow flowmeter measurement gas and liquid.
For completing above-mentioned detachment process, the main spacer assembly that the present invention adopts comprises: pipeline, is arranged at the inner tube in pipeline, the through hole in inner tube and slot and for the fixing front and back dividing plate of inner tube.The strengthening resolution element adopting comprises: two-stage cyclones, reducer and cyclone pipe.These elements both can be driven to the drop in air-flow and on wall, formed liquid film or be limited near boundary layer very thin wall, and the centrifugal force producing also contributes to realize mutually and separates simultaneously.In order more effectively to realize mutually and to separate, in separation process, need a small amount of gas to follow liquid film to enter the pooling zone of liquid together with drop.Adding of these gases is inevitably, also can improve the efficiency of whole piece-rate system simultaneously.But in order to complete the complete separation of gas-liquid two-phase fluid in pipe, finally also these gases must be separated from followed liquid, and be turned back in gasmetry pipeline and go.Because their amount is relatively less, and in mezzanine space, can rely on separation by gravity to go out a part, therefore the present invention is only provided with the small-sized conventional separation vessel that a diameter is less than or equal to pipe diameter, and be attached thereto logical muffler, pipe core and fluid return passageway.Finally, the device that completes gas and liquid flow measurement comprises a gas and a liquid flowmeter, despinner and level gauging and regulating device.
In a word, phase isolation technique in the present invention manages by employing, coordinate centrifugal and gravity fractionation, through a plurality of separating steps, complete the complete separation of gas-liquid two-phase fluid in pipeline, thereby significantly dwindle the volume of partition method class gas-liquid two-phase flow measuring apparatus, improve the real-time of measuring, and significantly reduce manufacturing cost, so that widespread use in engineering.
Accompanying drawing explanation
The flow pattern schematic diagram of gas-liquid two-phase fluid in horizontal pipe when Fig. 1 is high void fraction (gas volume fraction is greater than 90%); Wherein: Figure 1A be flow velocity when lower (being less than 4-6 meter per second) liquid film be deposited on the bottom schematic view of pipeline, Figure 1B be flow velocity while further increasing liquid film form the schematic diagram of semicircular stream, Fig. 1 C be flow velocity when higher liquid film form the schematic diagram of ring-type.
Fig. 2 is the structural representation of the flow measurement device of high void fraction gas-liquid two-phase fluid of the present invention, wherein arrow
indicate the flow direction that represents fluid.
Fig. 3 is the partial enlarged drawing of cyclone pipe 34 and transition conduit 36 both junctions.
Fig. 4 is the another kind of version of I between Disengagement zone.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be described in more detail.
Accompanying drawing 1 is that as Mandhane flow regime map, the gas-liquid two-phase fluid of drafting is the fluidised form schematic diagram in horizontal tube when high void fraction (gas volume fraction is greater than 90%) according to the result of study of current two-phase flow.Gas 01 is distributed in pipeline 2 with the form (figure empty part) of continuous state, liquid is present in pipeline 2 with three kinds of forms: with fine drop 4 (micron order and following), be dispersed in gas, be suspended in air-flow neutralization be close on tube wall with continuous liquid film 8 with larger drop 6 (grade).Liquid film 8 can be deposited on the bottom (accompanying drawing 1 of pipeline 2 when flow velocity is lower, (to be less than 4-6 meter per second), A), when further increasing, flow velocity (is more than or equal to 6-12 meter per second), form semicircular stream (accompanying drawing 1, B), when flow velocity is higher, (be greater than 12-16 meter per second), liquid film 8 can form ring-type (accompanying drawing 1, C).When pipeline 2 vertical placement, due to stressed symmetry, the distribution form of liquid is similar to accompanying drawing 1 (C), but the thickness of liquid film 8 circumferentially can be more even.
As shown in Figure 2, the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe of the present invention, comprise pipeline 2, by front dividing plate 53a and rear bulkhead 53b, be fixed on the inner tube 12 on pipeline 2 inwalls, between the outer wall of the inwall of pipeline 2 and inner tube 12, keep a mezzanine space 14, streamwise, described inner tube 12 comprises and being communicated with successively and coaxial inner tube leading portion 12a, reducer 32, cyclone pipe 34, transition conduit 36, increaser 38 and inner tube back segment 12b, in inner tube leading portion 12a, be provided with the first cyclone 16 and the second cyclone 22, in inner tube back segment 12b, be provided with despinner 52 and gas meter 54, on the tube wall of described inner tube 12, be distributed with through hole or slot 15, in inner tube 12, also comprise a pipe core 24, the entrance of described pipe core 24 is connected with the outlet that is arranged on the muffler 46 at pipeline 2 tops, the outlet of pipe core 24 is connected with transition conduit 36, and the entrance of muffler 46 is connected with the top that is arranged on the small-sized conventional separation vessel 45 that pipeline 2 tops and mezzanine space 14 be communicated with, the first declining liquid tube 18 that is disposed with in the bottom of described pipeline 2 and is communicated with mezzanine space 14, the second declining liquid tube 26, the 3rd declining liquid tube 28 and liquid measure pipe 29, the first declining liquid tube 18 bottoms are connected with the entrance of liquid measure pipe 29, the second declining liquid tube 26 and the 3rd declining liquid tube 28 were communicated with by communicating pipe 27, and be connected by the side of communicating pipe 27 and the first declining liquid tube 18, in the first declining liquid tube 18, liquid level gauge 58 is installed, variable valve 57 and liquid flowmeter 56 are installed on liquid measure pipe 29, described variable valve 57 is connected by control signal wire 59 with liquid level gauge 58.
As the preferred embodiment of the present invention, the width of the aperture of the through hole distributing on the tube wall of described inner tube 12 or slot 15 is below one of percentage of pipeline 2 internal diameters but is not less than 2 millimeters.
As the preferred embodiment of the present invention, the bottom of described small-sized conventional separation vessel 45 is provided with gas averaging board 42 and turbo blade 43, and top is provided with corrugated sheet assembly 44; The diameter of small-sized conventional separation vessel 45 is less than or equal to the diameter of pipeline 2.
As the preferred embodiment of the present invention, described pipe core 24 is coaxially installed with pipeline 2, inner tube 12, the second cyclone 24, reducer 32, cyclone pipe 34 and transition conduit 36, and passes from their center.
As the preferred embodiment of the present invention, the diameter of described the 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 be no more than pipeline 2 diameter 1/3rd.
As the preferred embodiment of the present invention, in described chuck space 14, be provided with the first ring flat-plate 17b being fixed on pipeline 2 inwalls, also be provided with the second ring flat-plate 17a being fixed on inner tube 12 outer walls, wherein be fixed on the gap of the second ring flat-plate 17a outer rim on inner tube 12 outer walls and pipeline 2 inwalls and be fixed on the first ring flat-plate 17b inner edge on pipeline 2 inwalls and the gap of inner tube 12 outer walls is 1～5mm, along conduit axis direction, the first ring flat-plate 17b and the second ring flat-plate 17a alternative arrangement, form air seal component.
As the preferred embodiment of the present invention, as shown in Figure 3, the external diameter of described transition conduit 36 is than the little 1～6mm of the internal diameter of cyclone pipe 34, and inlet end 37 stretches in cyclone pipe 34 at least 50mm, endpiece is connected with increaser 38, and the inwall of the outer wall of transition conduit 36 and cyclone pipe 34 forms a gap 39.
As the preferred embodiment of the present invention, described the first cyclone 16 and the second cyclone 22 are formed around a central shaft by 4～8 helical blades, helical blade and central shaft are as a whole, and the inwall close contact of helical blade outer rim and inner tube 12 is very close to each other; The blade screw angle of the first cyclone 16 is at least greater than 2 °, the blade screw angle of the second cyclone 22.
As the preferred embodiment of the present invention, described reducer 32 is a conical tube, and its inlet diameter is greater than outlet diameter, and the angle between its inwall and axis is 10 °～23 °.
As the preferred embodiment of the present invention, described cyclone pipe 34 is one section of pipe, its length is its internal diameter 1～4 times.
As the preferred embodiment of the present invention, described increaser 38 is a conical tube, and its inlet diameter is less than outlet diameter, and the angle of its inwall and axis is 2 °～8 °.
As the preferred embodiment of the present invention, as shown in Figure 2, described front dividing plate 53a is a conical tube, is installed on the porch of measurement mechanism, and one end, upstream is connected with the inwall of pipeline 2, and one end, downstream is connected with inner tube 12; Or as shown in Figure 4, front dividing plate 53a is a ring flat-plate, now this ring flat-plate is installed on Yi Duan position, downstream, measurement mechanism porch, and and between the bottom of pipeline 2, leave the spacing of 1-6 millimeter, front demarcation strip 53a has moved a segment distance downstream from the inlet end of inner tube 12, and liquid film 8 can be flowed directly in mezzanine space 14.Now between front demarcation strip 53a and the bottom of pipeline 2, leave enough gaps, to guarantee that liquid film passes through.
As the preferred embodiment of the present invention, described despinner 52 is one group of flat board that the axis with inner tube 12 is arranged in parallel.These flat boards are separated into by the inner space of inner tube back segment 12b the small flow channels that some circulation areas equate or are distributed symmetrically.
The measuring method of the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in pipe described above: the present invention is divided into four steps and completes the complete separation of gas-liquid two-phase fluid in pipeline, four steps complete in respectively between the corresponding Disengagement zone of the I shown in Fig. 2, II, III and IV.As shown in Figure 2, when high void fraction gas-liquid two-phase fluid is when dividing plate 53a enters inner tube 12 in the past, under Action of Gravity Field, a part for liquid film 8 falls into mezzanine space 14 by the through hole in inner tube 12 or slot 15, under the centrifugal action that all the other liquid films 8 can produce when gas-liquid two-phase fluid flows through the first cyclone 16, enters in mezzanine space 14, when the gas-liquid two-phase fluid after getting rid of liquid film flows through the second cyclone 22, rotation is further strengthened, be dispersed in larger drop 6 in air-flow and can be centrifuged on the inwall that power is driven to inner tube 12, then by through hole or slot 15, enter in mezzanine space 14, when only containing the swirling eddy of fine liquid particles during by reducer 32, radius of turn is significantly dwindled, according to law of conservation of moment of momentum, now the rotational speed of air-flow can be greatly enhanced, under the effect of powerful centrifugal force, the fine drop being dispersed in air-flow can be thrown on wall in cyclone pipe 34, form very thin one deck liquid film, or converge near very thin boundary layer wall, as shown in Figure 3, this layer of liquid film can rely on inertia to flow in mezzanine space 14 from the inwall of cyclone pipe 34 and the gap 39 between transition conduit 36 outer walls together with a small amount of gas, all the other dry gas enter in increaser 38 by transition conduit 36, gas in inner tube 12 enters mezzanine space 14 except the gap 39 of meeting between cyclone pipe 34 inwalls and transition conduit 36 outer walls, also can follow liquid film 8 and drop 6 through hole or the slot 15 inner tube to flow in mezzanine space 14, by regulating the size in air seal component 17a, 17b and gap 39, just can control the flow of this part gas that enters mezzanine space 14, in mezzanine space 14, liquid film and drop fall under gravity in the first declining liquid tube 18, the second declining liquid tube 26 or the 3rd declining liquid tube 28, gas carries a small amount of fine drop and enters in small-sized conventional separation vessel 45, after small-sized conventional separation vessel 45 dehumidifications, dry gas flows in pipe core 24 through muffler 46, then the dry gas in transition conduit 36 and in cyclone pipe 34 converges, together through increaser 38 reductions of speed, boost again and despinner 52 rectifications after, by gas meter 54, measure its flow, finally flow out inner tube back segment 12b, get back in pipeline 2, 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, first come together in the first declining liquid tube 18, then from its bottom, enter liquid measure pipe 27, after controlling, variable valve 57 measures its flow by liquid flowmeter 56, in last flow ipe 2, converge with the dry gas flowing out from inner tube 12, together flow out flow measurement device.
Claims (10)
1. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a pipe, it is characterized in that: comprise pipeline (2), by front dividing plate (53a) and rear bulkhead (53b), be fixed on the inner tube (12) on pipeline (2) inwall, between the outer wall of the inwall of pipeline (2) and inner tube (12), keep a mezzanine space (14), streamwise, described inner tube (12) comprises and being communicated with successively and coaxial inner tube leading portion (12a), reducer (32), cyclone pipe (34), transition conduit (36), increaser (38) and inner tube back segment (12b), in inner tube leading portion (12a), be provided with the first cyclone (16) and the second cyclone (22), in inner tube back segment (12b), be provided with despinner (52) and gas meter (54), on the tube wall of described inner tube (12), be distributed with through hole or slot (15), in inner tube (12), also comprise a pipe core (24), the entrance of described pipe core (24) is connected with the outlet that is arranged on the muffler (46) at pipeline (2) top, the outlet of pipe core (24) is connected with transition conduit (36), and the entrance of muffler (46) is connected with the top that is arranged on the small-sized conventional separation vessel (45) that pipeline (2) top and mezzanine space (14) be communicated with, the first declining liquid tube (18) that is disposed with and is communicated with mezzanine space (14) in the bottom of described pipeline (2), 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), the second declining liquid tube (26) and the 3rd declining liquid tube (28) were communicated with by communicating pipe (27), and be connected by the side of communicating pipe (27) and the first declining liquid tube (18), liquid level gauge (58) is installed in the first declining liquid tube (18), variable valve (57) and liquid flowmeter (56) are installed on liquid measure pipe (29), described variable valve (57) is connected by control signal wire (59) with liquid level gauge (58).
2. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, is characterized in that: the width of the aperture of the through hole distributing on the tube wall of described inner tube (12) or slot (15) is below one of percentage of pipeline (2) internal diameter but is not less than 2 millimeters.
3. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, it is characterized in that: described pipe core (24) is coaxially installed with pipeline (2), inner tube (12), the second cyclone (24), reducer (32), cyclone pipe (34) and transition conduit (36), and passes from their center.
4. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, it is characterized in that: the diameter of described the 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) be no more than pipeline (2) diameter 1/3rd.
5. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, it is characterized in that: in described mezzanine space (14), be provided with the first ring flat-plate (17b) being fixed on pipeline (2) inwall, also be provided with the second ring flat-plate (17a) being fixed on inner tube (12) outer wall, wherein be fixed on the gap of the second ring flat-plate (17a) outer rim on inner tube (12) outer wall and pipeline (2) inwall and be fixed on the first ring flat-plate (17b) inner edge on pipeline (2) inwall and the gap of inner tube (12) outer wall is 1～5mm, along conduit axis direction, the first ring flat-plate (17b) and the second ring flat-plate (17a) alternative arrangement, form air seal component.
6. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, it is characterized in that: the external diameter of described transition conduit (36) is than the little 1～6mm of internal diameter of cyclone pipe (34), and inlet end (37) stretches in cyclone pipe (34) at least 50mm, endpiece is connected with increaser (38), and the inwall of the outer wall of transition conduit (36) and cyclone pipe (34) forms a gap (39).
7. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, it is characterized in that: described the first cyclone (16) and the second cyclone (22) are formed around a central shaft by 4～8 helical blades, helical blade and central shaft are as a whole, and the inwall close contact of helical blade outer rim and inner tube (12) is very close to each other; The blade screw angle of the first cyclone (16) is at least greater than 2 °, the blade screw angle of the second cyclone (22).
8. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, it is characterized in that: described front dividing plate (53a) is a conical tube, be installed on the porch of measurement mechanism, one end, upstream is connected with the inwall of pipeline (2), and one end, downstream is connected with inner tube (12); Or front dividing plate 53a is a ring flat-plate, now this ring flat-plate is installed on Yi Duan position, downstream, measurement mechanism porch, and and the bottom of pipeline (2) between leave the spacing of 1-6 millimeter.
9. the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in a kind of pipe according to claim 1, is characterized in that: described despinner (52) is one group of flat board that the axis with inner tube (12) is arranged in parallel.These flat boards are separated into by the inner space of inner tube back segment (12b) small flow channels that some circulation areas equate or are distributed symmetrically.
10. adopt the measuring method of the high void fraction gas-liquid two-phase fluid of phase cellular-type flow measurement device in pipe claimed in claim 1: it is characterized in that: when high void fraction gas-liquid two-phase fluid the past dividing plate (53a) enters inner tube (12), under Action of Gravity Field, a part for liquid film (8) falls into mezzanine space (14) by the through hole in inner tube (12) or slot (15), under the centrifugal action that all the other liquid films (8) can produce when gas-liquid two-phase fluid flows through the first cyclone (16), enters in mezzanine space (14), when the gas-liquid two-phase fluid after getting rid of liquid film flows through the second cyclone (22), rotation is further strengthened, be dispersed in larger drop (6) in air-flow and can be centrifuged on the inwall that power is driven to inner tube (12), then by through hole or slot (15), enter in mezzanine space (14), when only containing the swirling eddy of fine liquid particles during by reducer (32), radius of turn is significantly dwindled, according to law of conservation of moment of momentum, now the rotational speed of air-flow can be greatly enhanced, under the effect of powerful centrifugal force, the fine drop being dispersed in air-flow can be thrown on wall in cyclone pipe (34), form very thin one deck liquid film, or converge near very thin boundary layer wall, this layer of liquid film can rely on inertia to flow in mezzanine space (14) from the inwall of cyclone pipe (34) and the gap (39) between transition conduit (36) outer wall together with a small amount of gas, all the other dry gas enter in increaser (38) by transition conduit (36), gas in inner tube (12) enters mezzanine space (14) except the gap (39) of meeting between cyclone pipe (34) inwall and transition conduit (36) outer wall, also can follow liquid film (8) and drop (6) through hole or the slot (15) inner tube to flow in mezzanine space (14), by regulating the size of air seal component (17a), (17b) and gap (39), just can control the flow of this part gas that enters mezzanine space (14), in mezzanine space (14), liquid film and drop fall under gravity into the first declining liquid tube (18), in the second declining liquid tube (26) or the 3rd declining liquid tube (28), gas carries a small amount of fine drop and enters in small-sized conventional separation vessel (45), after small-sized conventional separation vessel (45) dehumidification, dry gas flows in pipe core (24) through muffler (46), then the dry gas in transition conduit (36) and in cyclone pipe (34) converges, together through increaser (38) reduction of speed, boost again and despinner (52) rectification after, by gas meter (54), measure its flow, finally flow out inner tube (12), get back in pipeline (2), three strands of liquid that 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 first declining liquid tube (18), then from its bottom, enter liquid measure pipe (27), after controlling, variable valve (57) measures its flow by liquid flowmeter (56), in last flow ipe (2), converge with the dry gas flowing out from inner tube (12), together flow out flow measurement device.
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