CN105547386A - Device and method for measuring gas and liquid two-phase flow in horizontal pipeline - Google Patents
Device and method for measuring gas and liquid two-phase flow in horizontal pipeline Download PDFInfo
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- CN105547386A CN105547386A CN201510973534.7A CN201510973534A CN105547386A CN 105547386 A CN105547386 A CN 105547386A CN 201510973534 A CN201510973534 A CN 201510973534A CN 105547386 A CN105547386 A CN 105547386A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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Abstract
The invention provides a device and method for measuring gas and liquid two-phase flow in a horizontal pipeline. The device comprises a main transverse pipe, a left vertical pipe, a right vertical pipe, a left branch pipe, a right branch pipe, an auxiliary transverse pipe, a near-infrared emission probe, a near-infrared receiving probe, a differential pressure transmitter, a data acquisition unit and a data processing unit. The arrangement modes of the near-infrared emission probe and the near-infrared receiving probe are changed, near-infrared light emitted by the near-infrared emission probe is made to be transmitted in the flowing direction of fluid in the auxiliary transverse pipe, the defects that light paths in the pipes are complex, and data is redundant because of refraction, reflection and other optical effects of the light paths in the prior art are overcome, it is guaranteed that after optical signals emitted by the emission probe can be completely absorbed by the corresponding receiving probe after passing measured fluid and being subjected to optical effects, and therefore accuracy of phase volume fraction measurement is improved. Pressure difference is obtained through the differential pressure transmitter, and therefore the total flow can be obtained. Based on the total flow and phase volume fraction, the each phase of flow in two-phase flow can be obtained.
Description
Technical field
The present invention relates to a kind of multiphase flow rate pick-up unit, specifically a kind of device and method measuring biphase gas and liquid flow flow in horizontal pipe.
Background technology
In biphase gas and liquid flow, the flow of each phase can be multiplied by each phase phase content by total flow and draw.At present, the measuring method for gas-liquid two-phase flow containing rate mainly contains: the direct method of measurement, attenuation sensors, electric method, microwave method and optical method.The direct method of measurement is mainly used in the demarcation of measurement mechanism and the cross-sectional mean void fraction of laboratory measurement pipeline.But due to the proper flow of fluid can be cut off when measuring, so can not flow state online, in real-time measuring channel.Attenuation sensors measuring principle be the ray sent from radiographic source when penetrating fluid-mixing by absorption of fluids, along with the thickness of fluid, signal presents the rule of exponential damping, but there is the safety problem that radiation operations is relevant in attenuation sensors measuring process, and the pulsation in time of bubble and voidage all has a certain impact to measurement result.Electric method determines phase content by the relation of distribution of each phase and electrical impedance, and therefore impedance method is also divided into conductance method and capacitance method.But electrical measurement is subject to flow pattern impact, causes the many factors affecting void fraction.Microwave method is the measurement being realized polyphasic flow phase content at microwave frequencies by the change of specific inductive capacity and phase place in-migration, there is the advantages such as real-time is good, measuring accuracy is high, good reliability, antijamming capability are strong, but there is limitation, measure oil-water two-phase flow void fraction at present and mainly concentrate on low-water-content and high-moisture percentage.Compare with other measuring methods, optical method susceptibility is not subject to flow pattern impact, and data acquisition is simply rapid, is easy to the remote continuous coverage of real-time online, therefore has related application in fields such as two-phase flow speed, phase content, flow patterns.
At present, the pick-up unit of the gas-liquid two-phase flow containing rate based on Near-infrared Spectral Absorption characteristic has been built in existing laboratory.But, when utilizing the existing plumbing installation in laboratory to detect biphase gas and liquid flow, in Flow Regime Ecognition, better to the identification of slug flow, and as not obvious in identifications such as bubble flows.Analyze its reason: except light leak reason, because bubble, the equidistributed erratic behavior of drop and complicacy in bubble flow, cause light path in pipeline to pass through the optical effects such as reflection, refraction, the light signal launched by transmitting probe can not be received by the receiving transducer of correspondence completely.Convection identification is not obvious will directly cause measurement result inaccurate.
Summary of the invention
An object of the present invention is just to provide a kind of device measuring biphase gas and liquid flow flow in horizontal pipe, to solve the problem that the identification of existing pick-up unit convection not too obviously causes measurement result not accurate enough.
Two of object of the present invention is just to provide a kind of method measuring biphase gas and liquid flow flow in horizontal pipe, adopts the method to be separated without the need to carrying out two-phase flow the separate phase flow rate can measuring two-phase flow in horizontal pipe exactly.
An object of the present invention is achieved in that a kind of device measuring biphase gas and liquid flow flow in horizontal pipe, comprising:
Main transverse tube, its two ends connect with horizontal pipe; The inside of described main transverse tube is provided with dividing plate, and the inner chamber of described main transverse tube is divided into left and right two parts by described dividing plate; The sidewall of the dividing plate both sides of described main transverse tube has a pressure tap;
Left VERTICAL TUBE, is arranged on the sidewall of described main transverse tube, the left side intracavity inter-connection of its inner chamber and described main transverse tube;
Right VERTICAL TUBE, is arranged side by side with described left VERTICAL TUBE, the right side intracavity inter-connection of its inner chamber and described main transverse tube;
Left arm, is arranged in described left VERTICAL TUBE, the intracavity inter-connection of its inner chamber and described left VERTICAL TUBE; Described left arm is horizontal, and described left arm is vertical with described main transverse tube;
Right arm, is arranged in described right VERTICAL TUBE, the intracavity inter-connection of its inner chamber and described right VERTICAL TUBE; Described right arm is horizontal, and described right arm is vertical with described main transverse tube; Described right arm and described left arm one_to_one corresponding;
Secondary transverse tube, its two ends connect with corresponding left arm and right arm respectively, and described secondary transverse tube is parallel with described main transverse tube; The inner chamber of described secondary transverse tube all communicates with the inner chamber with its left arm connected and right arm;
Near infrared emission is popped one's head in, and is arranged on one end of described secondary transverse tube, for launching near infrared light to irradiate the fluid in secondary transverse tube along fluid flow direction;
Near infrared receiving transducer, is arranged on the other end of described secondary transverse tube, connects with data acquisition unit, for receiving the light intensity signal of the near infrared light after absorption of fluids;
Differential pressure transmitter, is arranged on described main transverse tube, connects with data acquisition unit, for being measured the pressure differential at fluid two ends, left and right in main transverse tube by two pressure taps on described main transverse tube;
Data acquisition unit, connect with described near infrared receiving transducer, described differential pressure transmitter and data processing unit respectively, for gathering the light intensity signal of the fluid differential pressure signal at two ends, left and right and near infrared light after absorption of fluids in main transverse tube, and collected signal is sent to data processing unit; And
Data processing unit, connects with described data acquisition unit, for signal calculated level fluids within pipes total flow, each phase phase content and each phase flow rate that basis receives.
The cross-sectional area of described left arm, described right arm and described secondary transverse tube is all identical; The cross-sectional area of single left arm is less than the cross-sectional area of described main transverse tube, and the cross-sectional area sum of all left arms is greater than the cross-sectional area of described main transverse tube.
The cross-sectional area of described left VERTICAL TUBE, described right VERTICAL TUBE, described main transverse tube and described horizontal pipe is all identical.
Flange joint is passed through between the two ends of described main transverse tube and described horizontal pipe.
The present invention is by arranging main transverse tube, two ends of main transverse tube are made to be connected on the horizontal pipe at fluid place to be measured, and dividing plate is set in main transverse tube, by dividing plate, the inner chamber of main transverse tube is divided into two chambers in left and right, the sidewall that main transverse tube left chamber is corresponding connects left VERTICAL TUBE, the sidewall that main transverse tube right chamber is corresponding connects right VERTICAL TUBE, and left arm and right arm are one to one set in left VERTICAL TUBE and right VERTICAL TUBE, at the left arm of correspondence and the indirect secondary transverse tube of right arm; Fluid flows in the left chamber of main transverse tube from left side horizontal pipe, flows in the right chamber of main transverse tube by after left VERTICAL TUBE, left arm, secondary transverse tube, right arm and right VERTICAL TUBE, is flowed in the horizontal pipe of right side afterwards by the right chamber of main transverse tube.Near infrared emission probe and near infrared receiving transducer are installed respectively at the two ends of secondary transverse tube, and near infrared emission is popped one's head in send out near infrared light and irradiate two-phase flow fluid in secondary transverse tube along fluid flow direction, near infrared receiving transducer can receive the light intensity signal of the near infrared light after absorption of fluids at the other end of secondary transverse tube.By arranging pressure tap respectively in the outside of the upper left VERTICAL TUBE of main transverse tube and right VERTICAL TUBE, and measured the pressure differential at fluid two ends, left and right in main transverse tube by differential pressure transmitter.Data processing unit can calculate horizontal pipe inner fluid total flow, each phase phase content and each phase flow rate according to the light intensity of the fluid pressure differential at two ends, left and right and the near infrared light after absorption of fluids in main transverse tube.
Near infrared light fluid is adopted to be all the irradiation that near infrared light is carried out perpendicular to fluid flow direction in prior art, the present invention changes the set-up mode of near infrared emission probe and near infrared receiving transducer, near infrared emission is popped one's head in send out near infrared light and transmit along secondary transverse tube inner fluid flow direction, device light leak can be overcome thus, bubble in bubble flow, the equidistributed erratic behavior of drop and complicacy etc., light path in pipeline is caused to pass through reflection, after the optical effects such as refraction, the light signal that transmitting probe after fluids within pipes is launched can not be received by the receiving transducer of correspondence completely, thus cause Flow Regime Ecognition poor effect, flow pattern judges inaccurate situation, make the light in pipeline, in any case reflection, refraction, can be received by the receiving transducer of correspondence, significantly improve light and enter rear received ratio from Way in, thus reach the object of Measurement accuracy more.
Two of object of the present invention is achieved in that a kind of method measuring biphase gas and liquid flow flow in horizontal pipe, comprises the steps:
A, by the two ends of main transverse tube by Flange joint on horizontal pipe;
In described main transverse tube, be provided with dividing plate, the inner chamber of described main transverse tube is divided into left and right two parts by described dividing plate; The sidewall of the dividing plate both sides of described main transverse tube has a pressure tap; The sidewall of described main transverse tube is set side by side with left VERTICAL TUBE and right VERTICAL TUBE, the left side intracavity inter-connection of described left VERTICAL TUBE and described main transverse tube, the right side intracavity inter-connection of described right VERTICAL TUBE and described main transverse tube; Described left VERTICAL TUBE is provided with the left arm with left VERTICAL TUBE intracavity inter-connection, described right VERTICAL TUBE is provided with right VERTICAL TUBE intracavity inter-connection and with described left arm right arm one to one; Between the described left arm and described right arm of correspondence, be provided with secondary transverse tube, described secondary transverse tube is parallel with described main transverse tube, and the inner chamber of described secondary transverse tube all communicates with the inner chamber of described left arm and described right arm; First fluid in horizontal pipe enters in the left side inner chamber of main transverse tube by the left end of main transverse tube, again successively through left VERTICAL TUBE, left arm, secondary transverse tube, right arm, right VERTICAL TUBE is laggard becomes owner of in the right side inner chamber of transverse tube, then flows in horizontal pipe by the right-hand member of main transverse tube;
B, differential pressure transmitter is arranged on described main transverse tube, is measured the pressure differential at fluid two ends, left and right in main transverse tube by differential pressure transmitter by two pressure taps on described main transverse tube, surveyed data are sent to data processing unit after data acquisition unit simultaneously;
C, at the left end of secondary transverse tube, near infrared emission probe is installed, at the right-hand member of secondary transverse tube, near infrared receiving transducer is installed; Drive near infrared emission to pop one's head in by driver module and launch near infrared light, the near infrared light launched irradiates the fluid in secondary transverse tube along fluid flow direction, near infrared receiving transducer receives the light intensity signal of the near infrared light after absorption of fluids, and received signal is sent to data processing unit after data acquisition unit;
D, data processing unit calculate horizontal pipe inner fluid total flow, each phase phase content and each phase flow rate according to the light intensity of the fluid the received pressure differential at two ends, left and right and the near infrared light after absorption of fluids in main transverse tube.
In steps d, the computing formula of fluid total flow is:
In formula, Q
vfor the total flow of horizontal pipe inner fluid, K is efflux coefficient, S
afor the cross-sectional area sum of all secondary transverse tubes, Δ P is the pressure differential at two ends, left and right in main transverse tube, and ρ is fluid density.
In steps d, gaseous phase volume containing the computing formula of rate is:
In formula: β
gfor gaseous phase volume is containing rate, N is the number of secondary transverse tube, β
gNbe that the gaseous phase volume of N number of secondary transverse tube is containing rate;
I
nthe light intensity of the near infrared light after absorption of fluids received by N number of secondary transverse tube right-hand member near infrared receiving transducer, I
lthe light intensity of the near infrared light after absorption of fluids during for being liquid entirely in secondary transverse tube received by near infrared receiving transducer, I
gthe light intensity of the near infrared light after absorption of fluids during for being gas entirely in secondary transverse tube received by near infrared receiving transducer;
Liquid phase volume containing the computing formula of rate is: β
l=1-β
g;
In horizontal pipe, in two-phase flow, gas phase flow rate is: Q
g=Q
v× β
g;
In horizontal pipe, in two-phase flow, liquid phase flow is: Q
l=Q
v× (1-β
g).
The method of biphase gas and liquid flow flow in measurement horizontal pipe provided by the present invention, by means of the device of biphase gas and liquid flow flow in above-mentioned measurement horizontal pipe, near infrared emission is popped one's head in send out near infrared light and transmit along secondary transverse tube inner fluid flow direction, overcome the refraction due to light path in prior art, in the pipe that the optical effects such as reflection cause, light path is complicated, the shortcomings such as data redundancy, ensure that the optical signalling that transmitting probe sends, after detected fluid and optical effect, can be absorbed completely by corresponding receiving transducer, thus improve the accuracy of phase content measurement.Utilize differential pressure transmitter to obtain pressure differential simultaneously, according to the relation between pressure differential and flow, calculate the total flow of horizontal pipe inner fluid.Based on total flow and phase content, can obtain each phase flow rate in two-phase flow, the detection for biphase gas and liquid flow provides a new thinking.
Accompanying drawing explanation
Fig. 1 is the structural representation of main transverse tube and the upper pipeline thereof connected with horizontal pipe in the present invention.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the left view of Fig. 1.
In figure: 1, main transverse tube, 2, dividing plate, 3, left VERTICAL TUBE, 4, right VERTICAL TUBE, 5, secondary transverse tube, 6, near infrared emission probe, 7, near infrared receiving transducer, 8, pressure tap, 9, left arm, 10, right arm.
Embodiment
Embodiment 1, a kind of device measuring biphase gas and liquid flow flow in horizontal pipe.
As shown in FIG. 1 to 3, in measurement horizontal pipe provided by the present invention, the device of biphase gas and liquid flow flow comprises main transverse tube 1, left VERTICAL TUBE 3, right VERTICAL TUBE 4, left arm 9, right arm 10, secondary transverse tube 5, near infrared emission probe 6, near infrared receiving transducer 7, differential pressure transmitter, data acquisition unit and data processing unit.
Main transverse tube 1 is placed in horizontal cross, and its diameter (comprising internal diameter and external diameter) is corresponding identical with the diameter of the horizontal pipe at biphase gas and liquid flow place to be measured, and the two ends of main transverse tube 1 are connected with left side horizontal pipe and right side horizontal pipe respectively by flange.Fluid in the horizontal pipe of left side flows into right side horizontal pipe after main transverse tube 1.
The inner chamber middle part of main transverse tube 1 is provided with vertical clapboard 2, and dividing plate 2 is circular plate-like shape body, and the inner chamber of main transverse tube 1 is divided into left and right two parts by dividing plate 2.Left VERTICAL TUBE 3 is welded on the sidewall of main transverse tube 1, and is positioned on the left of dividing plate 2, and external diameter, the internal diameter of the external diameter of left VERTICAL TUBE 3, internal diameter and main transverse tube 1 are corresponding identical respectively, and the left side intracavity inter-connection of the inner chamber of left VERTICAL TUBE 3 and main transverse tube 1.Right VERTICAL TUBE 4 is welded on the sidewall of main transverse tube 1 equally, and right VERTICAL TUBE 4 is positioned at the right side of dividing plate 2, and external diameter, the internal diameter of the external diameter of right VERTICAL TUBE 4, internal diameter and main transverse tube 1 are corresponding identical respectively, and the left side intracavity inter-connection of the inner chamber of right VERTICAL TUBE 4 and main transverse tube 1.Left VERTICAL TUBE 3 and right VERTICAL TUBE 4 are all positioned at the top of main transverse tube 1, and both are arranged side by side.
Left arm 9 is arranged on the sidewall of left VERTICAL TUBE 3, and left arm 9 is horizontal, and left arm 9 is vertical with main transverse tube 1.The quantity of left arm 9 is that N (4≤N≤10) is individual, in the present embodiment, the quantity of left arm 9 is 8, these 8 left arms 9 are equally divided into two groups, wherein one group is disposed in parallel on the rear sidewall of left VERTICAL TUBE 3 from top to bottom, another group is disposed in parallel on the front sidewall of left VERTICAL TUBE 3 from top to bottom, the inner chamber of each left arm 9 all with the intracavity inter-connection of left VERTICAL TUBE 3.Right arm 10 is arranged on the sidewall of right VERTICAL TUBE 4, right arm 10 and one_to_one corresponding parallel with left arm 9, the inner chamber of each right arm 10 all with the intracavity inter-connection of right VERTICAL TUBE 4.
As shown in Figure 2, secondary transverse tube 5 is connected between corresponding left arm 9 and right arm 10, and secondary transverse tube 5 is parallel with main transverse tube 1.The end sidewalls at secondary transverse tube 5 two ends connects with the end of left arm 9 and right arm 10 respectively, and the left arm 9 that the inner chamber of secondary transverse tube 5 is connected with it respectively is all connected with the inner chamber of right arm 10.Composition graphs 1, biphase gas and liquid flow fluid in the horizontal pipe of left side flows into (fluid flow direction as shown by the arrows in Figure 1) in the left side inner chamber of main transverse tube 1 through the left end of main transverse tube 1, flow in left VERTICAL TUBE 3 afterwards, flow in secondary transverse tube 5 by each left arm 9, flow in right VERTICAL TUBE 4 by each right arm 10 again, finally flow in the right side inner chamber of main transverse tube 1, and flowed in the horizontal pipe on right side by the right-hand member of main transverse tube 1.Secondary transverse tube 5, left VERTICAL TUBE 3 and right VERTICAL TUBE 4 are restricting element.
The internal diameter of left arm 9, right arm 10, secondary transverse tube 5 three is all identical, and external diameter is also all identical.The cross-sectional area of single left arm 9 inner chamber is less than the cross-sectional area (namely the internal diameter of single left arm 9 is less than the internal diameter of main transverse tube 1) of main transverse tube 1 inner chamber, but the cross-sectional area sum of N number of left arm 9 inner chamber is greater than the cross-sectional area of main transverse tube 1 inner chamber.The object of such design is the crushing in order to reduce when fluid flows through restricting element, improves accuracy of measurement.
The left side of secondary transverse tube 5 and right side by holding screw fixing glass thin slice, and arrange O-ring seal, to reach the object of sealing.Near infrared emission probe 6 is arranged on the left side of secondary transverse tube 5, and near infrared receiving transducer 7 is arranged on the right side of secondary transverse tube 5.Under the driving of driver module, near infrared emission probe 6 can launch near infrared light, send out near infrared light and irradiate the two-phase flow fluid in secondary transverse tube 5 through after glass flake along fluid flow direction; By fluid absorption mat energy, thus its light intensity decreasing can be made through the near infrared light after fluid; Under the driving of driver module, near infrared receiving transducer 7 can receive the light intensity signal of the near infrared light after absorption of fluids.Received light intensity signal can be sent to data processing unit by data acquisition unit by near infrared receiving transducer 7.
Fluid is after main transverse tube 1, left VERTICAL TUBE 3, left arm 9 enter secondary transverse tube 5, and the internal diameter due to secondary transverse tube 5 is less than the internal diameter of main transverse tube 1, therefore can cause the local contraction of a fluid stream, and the flow velocity of fluid is changed, and namely kinetic energy changes.Static pressure is recovered gradually along with the recovery of a fluid stream, and reducing and expanding of flow area, consume part energy, when fluid flows through restricting element simultaneously, overcome friction, so the static pressure of fluid can not return to original numerical value, and creates the pressure loss.Pressure differential in the cavity of main transverse tube 1 left and right sides is relevant with flow.Fluid flow is larger, and the pressure differential produced in the cavity of main transverse tube 1 left and right sides is larger, by measure differences in pressure, can obtain flow.Therefore the present invention respectively offers a pressure tap 8 in the outside (being about an inner diameter values of main transverse tube apart from left VERTICAL TUBE or right VERTICAL TUBE) of the upper left VERTICAL TUBE of main transverse tube 13 and right VERTICAL TUBE 4, two pressure taps are about dividing plate 2 symmetrically structure, and the axle center of two pressure taps on the same line, to ensure the consistance of pressure.
Differential pressure transmitter is arranged on main transverse tube 1, and differential pressure transmitter is by two pressure tap 8 measurable flow bodies pressure differential at (or two ends, left and right) in the cavity of the left and right sides in main transverse tube 1.Institute's measuring pressure difference can be sent to data processing unit through data acquisition unit.Data acquisition unit is generally data collecting card, and data processing unit can be computing machine.Also can set temperature sensor, gather the temperature in main transverse tube 1 in the cavity of the left and right sides by temperature sensor, institute's collecting temperature is sent to data processing unit through data acquisition unit, can carry out temperature compensation to the pressure differential in left and right sides cavity in main transverse tube 1.
Data processing unit receives the light intensity signal of the differential pressure signal of fluid in main transverse tube in the cavity of the left and right sides and the near infrared light after absorption of fluids sent by data acquisition unit, and according to the signal calculated level fluids within pipes total flow received, each phase phase content and each phase flow rate.Specific formula for calculation can see below described in embodiment.
Embodiment 2, a kind of method measuring biphase gas and liquid flow flow in horizontal pipe.
Composition graphs 1 ~ Fig. 3, in the measurement horizontal pipe that the present embodiment provides, the method for biphase gas and liquid flow flow comprises the steps:
A, by the two ends of main transverse tube 1 by Flange joint on horizontal pipe, stream is biphase gas and liquid flow fluid to be measured in horizontal pipe.
In main transverse tube 1, be provided with dividing plate 2, the inner chamber of main transverse tube 1 is divided into left and right two parts by dividing plate 2.The sidewall of main transverse tube 1 is set side by side with left VERTICAL TUBE 3 and right VERTICAL TUBE 4, and left VERTICAL TUBE 3 and right VERTICAL TUBE 4 lay respectively at the both sides of dividing plate 2, and about dividing plate 2 symmetrically structure.The inner chamber of left VERTICAL TUBE 3 and the left side intracavity inter-connection of main transverse tube 1, the inner chamber of right VERTICAL TUBE 4 and the right side intracavity inter-connection of main transverse tube 1.The left side being positioned at left VERTICAL TUBE 3 at the sidewall of main transverse tube 1 has a pressure tap 8, and the right side being positioned at right VERTICAL TUBE 4 at the sidewall of main transverse tube 1 also has a pressure tap 8, two pressure taps 8 about dividing plate 2 symmetrically structure, and both axle center are on same straight line.
Left VERTICAL TUBE 3 is provided with the left arm 9 with left VERTICAL TUBE 3 intracavity inter-connection, right VERTICAL TUBE 4 is provided with right VERTICAL TUBE 4 intracavity inter-connection and with left arm 9 right arm 10 one to one.Left arm 9 and right arm 10 are all vertical with main transverse tube 1, and in the present embodiment, the quantity of left arm 9 and right arm 10 is 8.Between the left arm 9 and right arm 10 of correspondence, be provided with secondary transverse tube 5, secondary transverse tube 5 is parallel with main transverse tube 1, and the inner chamber of secondary transverse tube 5 all communicates with the inner chamber with its left arm 9 connected and right arm 10.Horizontal pipe, main transverse tube 1, left VERTICAL TUBE 3 are all identical with the internal diameter of right VERTICAL TUBE 4, left arm 9, right arm 10 are all identical with the internal diameter of secondary transverse tube 5, the internal diameter of single secondary transverse tube 5 is less than the internal diameter of main transverse tube 1, but the cross-sectional area sum of all secondary transverse tube 5 inner chambers is greater than the cross-sectional area of main transverse tube 1 inner chamber.First fluid in the horizontal pipe of left side is entered by the left end of main transverse tube 1 in the left side inner chamber of main transverse tube 1, again successively through left VERTICAL TUBE 3, left arm 9, secondary transverse tube 5, right arm 10, right VERTICAL TUBE 4 is laggard becomes owner of in the right side inner chamber of transverse tube 1, then to be flowed in the horizontal pipe of right side by the right-hand member of main transverse tube 1.
B, differential pressure transmitter is arranged on main transverse tube 1, measures the differential pressure signal of fluid in main transverse tube 1 in the cavity of the left and right sides by differential pressure transmitter by two pressure taps 8 on main transverse tube 1; Simultaneously be sent to data processing unit by the differential pressure signal of data acquisition unit acquires fluid in main transverse tube 1 in the cavity of the left and right sides.
C, at the left end of secondary transverse tube 5, near infrared emission probe 6 is installed, at the right-hand member of secondary transverse tube 5, near infrared receiving transducer 7 is installed.Near infrared emission probe 6 is driven to launch near infrared lights by driver module, near infrared light is along fluid flow direction, the two-phase flow fluid of the different liquid phase volume of different flow pattern in secondary transverse tube containing rate is irradiated, irradiate the near infrared light light intensity signal after decay receive by near infrared receiving transducer 7; Simultaneously by the near infrared light of data acquisition unit acquires after absorption of fluids light intensity signal and be sent to data processing unit.
D, data processing unit are according to the differential pressure signal calculated level fluids within pipes total flow at the fluid received two ends, left and right in main transverse tube 1.Near infrared light is through the two-phase flow of different proportion, and the light intensity of the near infrared light received by near infrared receiving transducer is different.Data processing unit is according to each phase phase content in the light intensity signal calculated level pipeline of the near infrared light received.Based on fluid total flow and phase content, each phase flow rate can be drawn.
Data processing unit is as follows at the formula of calculated level fluids within pipes total flow time institute foundation:
In formula (1), Q
vfor the total flow (unit: m of horizontal pipe inner fluid
3/ s), K is efflux coefficient, S
afor the cross-sectional area sum (unit: m of all secondary transverse tube inner chambers
2), Δ P is the pressure differential (unit: Pa) at two ends, left and right in main transverse tube, and ρ is fluid density (unit: kg/m
3).
K is predetermined value by experiment.Experimentation is: the device lateral level in the present invention be arranged on two-phase flow horizontal pipe, and connect differential pressure transmitter, data acquisition unit and data processing unit.Gas in two-phase flow Shi You mono-road pipeline in horizontal pipe and the liquid in a road pipeline converge into, gas pipeline and fluid pipeline are installed flow detection table (belonging to standard scale) respectively, valve on adjustments of gas pipeline and fluid pipeline makes gas, liquid to certain flow velocity, the pressure differential Δ P (can many groups be surveyed) of the main transverse tube left and right sides is gathered by differential pressure transmitter, flow detection table simultaneously by pipeline is installed reads corresponding volumetric flow rate, can obtain the volume total flow Q of two-phase flow in horizontal pipe
v(also measuring by installation code table on horizontal pipe).The cross-sectional area sum S of all secondary transverse tube inner chambers in experiment
aknown, the density p of tested two-phase flow fluid is known, in conjunction with many group pressure differential Δ P, Q
v, efflux coefficient K can be drawn by data fitting.
Due to secondary transverse tube limited length in the present invention, therefore the cross section phase content of secondary transverse tube inner fluid can be approximately equal to volume phase content.When near infrared light passes the fluid in secondary transverse tube, gas and liquid all can absorb the energy of near infrared light, but the degree that both absorb near infrared light is different, that is, the degree that near infrared light is decayed after liquid through gas is different, and the decay of near infrared light shows as weakening of light intensity.For the near infrared light of specific wavelength, after two-phase flow, the decay of near infrared light light intensity equals the near infrared light linear sum of light intensity attenuation after different phase fluid respectively.Therefore the present invention needs to be beforehand with following experiment: make the whole of secondary horizontal Bottomhole pressure be gas, and launch near infrared light by near infrared emission probe, near infrared light is made to irradiate all gas in secondary transverse tube along gas flow direction, received the light intensity signal of the near infrared light after gas absorption by near infrared receiving transducer, recording this light intensity is I
g; The whole of secondary horizontal Bottomhole pressure are made to be liquid, and launch near infrared light by near infrared emission probe, make near infrared light irradiate whole liquid in secondary transverse tube along liquid flow direction, received the light intensity signal of the near infrared light after liquid absorption by near infrared receiving transducer, recording this light intensity is I
l.Then for when there is two-phase flow (gas and liquid with gases used during above-mentioned experiment, liquid is corresponding identical) in secondary transverse tube, suppose that in it, contained gaseous phase volume is x containing rate, then in it, contained liquid phase volume is (1-x) containing rate, if the light intensity of the near infrared light after absorption of fluids received by near infrared receiving transducer is I, then have: I=I
gx+I
l(1-x), can show that in single secondary transverse tube, gaseous phase volume is containing rate x by calculating.
In the present invention, if the number of secondary transverse tube is N, then in N number of secondary transverse tube, gaseous phase volume containing rate is:
In formula (2), I
nthe light intensity of the near infrared light after absorption of fluids received by N number of secondary transverse tube right-hand member near infrared receiving transducer, I
lthe light intensity of the near infrared light after absorption of fluids during for being liquid entirely in secondary transverse tube received by near infrared receiving transducer, I
gthe light intensity of the near infrared light after absorption of fluids during for being gas entirely in secondary transverse tube received by near infrared receiving transducer.
Be averaging containing rate gaseous phase volume in all secondary transverse tubes, obtaining gaseous phase volume in horizontal pipe interior (or in main transverse tube) two-phase flow, containing rate, therefore has following formula:
In formula (3): β
gfor the gaseous phase volume in horizontal pipe is containing rate, N is the number of secondary transverse tube, β
gNbe that gaseous phase volume in N number of secondary transverse tube is containing rate.
In horizontal pipe, liquid volume containing the computing formula of rate is: β
l=1-β
g.
In horizontal pipe, in two-phase flow, gas phase flow rate is: Q
g=Q
v× β
g.
In horizontal pipe, in two-phase flow, liquid phase flow is: Q
l=Q
v× (1-β
g).
Claims (7)
1. measure a device for biphase gas and liquid flow flow in horizontal pipe, it is characterized in that, comprising:
Main transverse tube, its two ends connect with horizontal pipe; The inside of described main transverse tube is provided with dividing plate, and the inner chamber of described main transverse tube is divided into left and right two parts by described dividing plate; The sidewall of the dividing plate both sides of described main transverse tube has a pressure tap;
Left VERTICAL TUBE, is arranged on the sidewall of described main transverse tube, the left side intracavity inter-connection of its inner chamber and described main transverse tube;
Right VERTICAL TUBE, is arranged side by side with described left VERTICAL TUBE, the right side intracavity inter-connection of its inner chamber and described main transverse tube;
Left arm, is arranged in described left VERTICAL TUBE, the intracavity inter-connection of its inner chamber and described left VERTICAL TUBE; Described left arm is horizontal, and described left arm is vertical with described main transverse tube;
Right arm, is arranged in described right VERTICAL TUBE, the intracavity inter-connection of its inner chamber and described right VERTICAL TUBE; Described right arm is horizontal, and described right arm is vertical with described main transverse tube; Described right arm and described left arm one_to_one corresponding;
Secondary transverse tube, its two ends connect with corresponding left arm and right arm respectively, and described secondary transverse tube is parallel with described main transverse tube; The inner chamber of described secondary transverse tube all communicates with the inner chamber with its left arm connected and right arm;
Near infrared emission is popped one's head in, and is arranged on one end of described secondary transverse tube, for launching near infrared light to irradiate the fluid in secondary transverse tube along fluid flow direction;
Near infrared receiving transducer, is arranged on the other end of described secondary transverse tube, connects with data acquisition unit, for receiving the light intensity signal of the near infrared light after absorption of fluids;
Differential pressure transmitter, is arranged on described main transverse tube, connects with data acquisition unit, for being measured the pressure differential at fluid two ends, left and right in main transverse tube by two pressure taps on described main transverse tube;
Data acquisition unit, connect with described near infrared receiving transducer, described differential pressure transmitter and data processing unit respectively, for gathering the light intensity signal of the fluid differential pressure signal at two ends, left and right and near infrared light after absorption of fluids in main transverse tube, and collected signal is sent to data processing unit; And
Data processing unit, connects with described data acquisition unit, for signal calculated level fluids within pipes total flow, each phase phase content and each phase flow rate that basis receives.
2. the device of biphase gas and liquid flow flow in measurement horizontal pipe according to claim 1, it is characterized in that, the cross-sectional area of described left arm, described right arm and described secondary transverse tube is all identical; The cross-sectional area of single left arm is less than the cross-sectional area of described main transverse tube, and the cross-sectional area sum of all left arms is greater than the cross-sectional area of described main transverse tube.
3. the device of biphase gas and liquid flow flow in measurement horizontal pipe according to claim 1, it is characterized in that, the cross-sectional area of described left VERTICAL TUBE, described right VERTICAL TUBE, described main transverse tube and described horizontal pipe is all identical.
4. the device of biphase gas and liquid flow flow in measurement horizontal pipe according to claim 1, is characterized in that, pass through Flange joint between the two ends of described main transverse tube and described horizontal pipe.
5. measure a method for biphase gas and liquid flow flow in horizontal pipe, it is characterized in that, comprise the steps:
A, by the two ends of main transverse tube by Flange joint on horizontal pipe;
In described main transverse tube, be provided with dividing plate, the inner chamber of described main transverse tube is divided into left and right two parts by described dividing plate; The sidewall of the dividing plate both sides of described main transverse tube has a pressure tap; The sidewall of described main transverse tube is set side by side with left VERTICAL TUBE and right VERTICAL TUBE, the left side intracavity inter-connection of described left VERTICAL TUBE and described main transverse tube, the right side intracavity inter-connection of described right VERTICAL TUBE and described main transverse tube; Described left VERTICAL TUBE is provided with the left arm with left VERTICAL TUBE intracavity inter-connection, described right VERTICAL TUBE is provided with right VERTICAL TUBE intracavity inter-connection and with described left arm right arm one to one; Between the described left arm and described right arm of correspondence, be provided with secondary transverse tube, described secondary transverse tube is parallel with described main transverse tube, and the inner chamber of described secondary transverse tube all communicates with the inner chamber of described left arm and described right arm; First fluid in horizontal pipe enters in the left side inner chamber of main transverse tube by the left end of main transverse tube, again successively through left VERTICAL TUBE, left arm, secondary transverse tube, right arm, right VERTICAL TUBE is laggard becomes owner of in the right side inner chamber of transverse tube, then flows in horizontal pipe by the right-hand member of main transverse tube;
B, differential pressure transmitter is arranged on described main transverse tube, is measured the pressure differential at fluid two ends, left and right in main transverse tube by differential pressure transmitter by two pressure taps on described main transverse tube, surveyed data are sent to data processing unit after data acquisition unit simultaneously;
C, at the left end of secondary transverse tube, near infrared emission probe is installed, at the right-hand member of secondary transverse tube, near infrared receiving transducer is installed; Drive near infrared emission to pop one's head in by driver module and launch near infrared light, the near infrared light launched irradiates the fluid in secondary transverse tube along fluid flow direction, near infrared receiving transducer receives the light intensity signal of the near infrared light after absorption of fluids, and received signal is sent to data processing unit after data acquisition unit;
D, data processing unit calculate horizontal pipe inner fluid total flow, each phase phase content and each phase flow rate according to the light intensity of the fluid the received pressure differential at two ends, left and right and the near infrared light after absorption of fluids in main transverse tube.
6. the method for biphase gas and liquid flow flow in measurement horizontal pipe according to claim 5, it is characterized in that, in steps d, the computing formula of fluid total flow is:
In formula, Q
vfor the total flow of horizontal pipe inner fluid, K is efflux coefficient, S
afor the cross-sectional area sum of all secondary transverse tubes, Δ P is the pressure differential at two ends, left and right in main transverse tube, and ρ is fluid density.
7. the method for biphase gas and liquid flow flow in measurement horizontal pipe according to claim 6, is characterized in that, in steps d, gaseous phase volume containing the computing formula of rate is:
In formula: β
gfor gaseous phase volume is containing rate, N is the number of secondary transverse tube, β
gNbe that the gaseous phase volume of N number of secondary transverse tube is containing rate;
I
nthe light intensity of the near infrared light after absorption of fluids received by N number of secondary transverse tube right-hand member near infrared receiving transducer, I
1the light intensity of the near infrared light after absorption of fluids during for being liquid entirely in secondary transverse tube received by near infrared receiving transducer, I
gthe light intensity of the near infrared light after absorption of fluids during for being gas entirely in secondary transverse tube received by near infrared receiving transducer;
Liquid phase volume containing the computing formula of rate is: β
l=1-β
g;
In horizontal pipe, in two-phase flow, gas phase flow rate is: Q
g=Q
v× β
g;
In horizontal pipe, in two-phase flow, liquid phase flow is: Q
l=Q
v× (1-β
g).
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