CN202994216U - Double differential pressure wet gas flow measuring device based on long throat neck venturi tube - Google Patents
Double differential pressure wet gas flow measuring device based on long throat neck venturi tube Download PDFInfo
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- CN202994216U CN202994216U CN 201220609952 CN201220609952U CN202994216U CN 202994216 U CN202994216 U CN 202994216U CN 201220609952 CN201220609952 CN 201220609952 CN 201220609952 U CN201220609952 U CN 201220609952U CN 202994216 U CN202994216 U CN 202994216U
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Abstract
The utility model belongs to the technical field of wet gas gas-liquid two-phrase flow measurement, and relates to a double differential pressure wet gas flow measuring device based on a long throat neck venturi tube. The double differential pressure wet gas flow measuring device based on the long throat neck venturi tube comprises a venturi measuring pipeline, a first differential pressure transmitter and a second differential pressure transmitter. The upper reaches of the venturi measuring pipeline, the middle-lower reaches of a laryngeal, and the lower reaches of the laryngeal are respectively provided with a pressure taking place. A plane where each pressure taking place is vertical to an axis is provided with four internal pressure taking holes, and the periphery of the four internal pressure taking holes is fixed with a ring casing structure. External press-leading tubes connected out from a pressure taking place of the upper reaches of the venturi measuring pipeline and a pressure taking place of the middle-lower reaches of the laryngeal are respectively connected with the first differential pressure transmitter, and external press-leading tubes connected out from a pressure taking place of the middle-lower reaches of the laryngeal and a pressure taking place of the lower reaches of the laryngeal are respectively connected with the second differential pressure transmitter. The double differential pressure wet gas flow measuring device based on the long throat neck venturi tube has the advantages of being simple in structure, free from movable parts, reliable in measuring, high in accuracy, and simple and convenient to implement.
Description
Technical field
The utility model belongs to moisture gas-liquid two-phase flow measurement technical field, relates to a kind of two differential pressure flux of moisture measurement mechanisms based on the long throat venturi.
Background technology
Moisture extensively is present in nature and industrial circle as a kind of specific form of biphase gas and liquid flow.When gas or liquid flow separately, flowing law is basic identical, all defers to continuity equation and the Bernoulli equation of fluid, and mathematical model is also all substantially similar.When their common existence are also flowed simultaneously, the larger difference of dielectric property existence due to two-phase fluid, as different in physical parameters such as the coefficient of friction resistance, fluid density and viscosity, add working condition pressure, the impact of two-phase speed sliding difference, make gas-liquid two-phase flow and single-phase flow compare more complicated, single-phase in mobile many criterion relations and during analytical approach all can not be applied directly to the research of gas-liquid two-phase.In recent decades, due to traditional industry and infant industry, development rapidly as fields such as industrial gas oil, chemical engineering, metallurgical engineering, nuclear reactor engineering, Aerospace Engineering, measuring technique to the moisture biphase gas and liquid flow has proposed more and more highland requirement, has also promoted the more deeply development rapidly of this technology simultaneously.Yet existing achievement in research shows, the measurement problem difficulty in this field is still very large, within the quite a long time will be all the important research direction that receives much concern of this territory it
Chinese patent ZL200810151346.6 has proposed a kind of double differential pressure throttle moisture measuring device, is made of the embedded common taper core body of straight tube and two restriction devices of standard venturi.Facts have proved, there is following shortcoming in this design: (1) taper core body is as one of detecting element, although can contribute a differential pressure measurement information, but contradiction has appearred in the otherness of guaranteeing two restriction devices with when satisfying public intersection measurement range, the measurement capability that this means this device is restricted, range ratio less than 1/3rd is used to be restricted under the larger working condition of industry spot fluctuations in discharge scope; (2) this Patent equipment adopts two kinds of restricting elements to be used for wet gas measurement, and complexity is high, and cost is high; (3) the taper core body of this Patent equipment and pipeline mounting means are taked welding technology, and both right alignmenies are difficult to guarantee, make the measurement mechanism processing inconsistency of same structure design obvious, cause the device normalization workload large; (4) the venturi throat secundum legem venturi design of this Patent equipment, further investigation show, liquid phase during by throat acceleration distance not enough, cause gas-liquid two-phase to mix abundant not, affect throat's pressure signal quality; (5) design of the venturi expansion segment expansion angle of this Patent equipment is undesirable, makes the downstream expansion segment easily cause refluxing, and forms hydrops, and the system that finally affects is to the identification capability of higher liquid phase content; (6) in this Patent equipment, ways of measure pressure is the single-point pressure, and employing external hanging type independently small-sized gas-liquid sealing chamber is realized the double pressure of gas-liquid isolation, and the signal to noise ratio (S/N ratio) of measuring-signal is low, and the gas-liquid efficiency of isolation is low; (7) in this Patent equipment all blowoff valves be positioned at gas-liquid sealing chamber lower end, its existing design can not realize sealing chamber and the Integral synchronous blowdown of measuring main line; (8) in this Patent equipment all the gas-liquid sealing chambers be positioned at a side of gauge line, affect the weight balancing of single unit system, due to the existence of rotary torque, affect safety and the serviceable life of device after installing.
" the two differential pressure flux of moisture based on long larynx footpath Venturi tube are measured " literary composition that " University Of Tianjin's journal " the 2nd phase in 2012 delivers, proposed a kind of two differential pressure flux of moisture measuring methods based on long throat list Venturi tube, quoted " Venturi tube contraction section differential pressure, expansion segment differential pressure " in the method and carried out correlation modeling as crucial measurement parameter.Facts have proved, there is following shortcoming in this experiment with device: directly ways of measure pressure is all taked on tube wall in (1) each pressure position, and only has a pressure point, use elongated tubular that the pressure of pressure position is caused external hanging type independence gas-liquid sealing chamber in experimentation, the gas-liquid efficiency of isolation is low, the pressure measurement signal signal to noise ratio (S/N ratio) is low, and repeatability is undesirable; (2) throat length is not enough, is only that 2.8 times of (3) throat's pressure positions of throat's internal diameter are not ideal enough, and this article is only in the place's pressure of throat's upstream and downstream, and the pressure position is not the optimum position; (4) expansion angle of expansion segment is undesirable, when the liquid phase content is larger, is prone to backflow phenomenon, and the downstream differential pressure signal loses meaning, can't use, so the restricted application of final mask.
The utility model content
The purpose of this utility model is the problems referred to above that overcome prior art, optimize the structural design in Venturi meter road, and the ways of measure pressure of improvement moisture two-phase flowmeter device, provide a kind of device that is more applicable for the moisture two-phase flowmeter, namely based on two differential pressure flux of moisture measurement mechanisms of long throat venturi.The utility model adopts following technical scheme:
a kind of two differential pressure flux of moisture measurement mechanisms based on the long throat venturi, comprise the Venturi meter road, the first differential pressure transmitter and the second differential pressure transmitter, the throat length in described Venturi meter road is between 4 ~ 8 times of throat diameter, upstream in the Venturi meter road, throat's middle and lower reaches position and downstream part respectively arrange pressure place, offer four inner pressure ports on each pressure place in Venturi meter road conplane tube wall vertical with axis, two, horizontal direction maximum gauge place, two, place, vertical direction maximal value footpath, fix a ring casing structure in the periphery of four inner pressure ports, this ring casing is coaxial with Venturi meter road body, be fixed on Venturi meter road body pressure place outer wall, formation has the gas-liquid isolated chamber in certain capacity space, offer the impulse mouth that connects external pressure guiding pipe above the chamber vertical axis, offer the sewage draining exit that connects external blow-off pipe below the chamber vertical axis, receive respectively the first differential pressure transmitter from the external pressure guiding pipe that upstream and two of the positions pressure of throat's middle and lower reaches pick out, receive respectively the second differential pressure transmitter from the external pressure guiding pipe that the position pressure of throat's middle and lower reaches and pressure place of two, downstream pick out, the external pressure guiding pipe that picks out from the upstream pressure is also connected to a pressure unit.
As preferred implementation, impulse mouth and sewage draining exit all with four inner pressure ports not in one plane; The internal diameter of described ring casing is between 1.1～2.5 times of Venturi meter road internal diameter, the chamber interior length be the measurement mechanism internal diameter 0.8 times ~ 2.5 between, the aperture of inner pressure port and the ratio of internal diameter of the pipeline are between 0.05 ~ 0.15, and the ratio of the height of inner pressure port and internal diameter of the pipeline is between 0.06 ~ 0.2.The expansion angle of Venturi meter road expansion segment is 3 ~ 6 °.Downstream pressure place is 59 times of internal diameter of the pipeline apart from the distance between the outlet of venturi expansion pipeline section.
The long throat venturi moisture two-phase flow measurement device that the utility model provides has following beneficial effect: (1) adopts the pressure of composite integrated ring casing gas-liquid isolation pressure vessel, this pressure vessel is the annular compartment with certain gas-liquid capacity, can hold 4 pressure ports measuring on main line pressure face, can realize the effectively isolation fast of gas-liquid, the weight balancing of single unit system is good, the measuring-signal signal to noise ratio (S/N ratio) is low, good reproducibility; (2) the utility model has lengthened larynx neck length degree, has improved throat's pressure position, has provided the pressure position on the straight length of downstream, has optimized the expansion angle of expansion segment.
Description of drawings
The two differential pressure flux of moisture measurement mechanism system diagrams of Fig. 1 long throat venturi (a) are front view, are (b) left view.
The two differential pressure flux of moisture measurement mechanism ring casing pressure place detail view of Fig. 2 long throat venturi.
Ring casing gas-liquid isolation pressure vessel structural representation (a) in Fig. 3 moisture measuring device is front view, is (b) sectional view.
Description of drawings is as follows: 1 pressure unit, 21 first differential pressure transmitter 22 second differential pressure transmitters, 3 temperature transmitters, 4 liang of valve groups, 5 ring casing pressure vessels, 6 pressure guiding pipes access pressure device, the 7 pressure guiding pipes dirty device that runs in, 8 blowoff valves, 9 long throat venturi restriction device throats, 10 measuring channels, 11 gas-liquid isolated chamber, 12 pressure ports
Embodiment
With reference to the accompanying drawings the utility model is further described.
The utility model is a kind of two differential pressure flux of moisture measurement mechanisms based on the long throat venturi.The flux of moisture measurement mechanism that is different from the past with the utility model is to adopt on the basis of optimal design Venturi tube structure, has adopted a kind of ring casing gas-liquid isolation pressure vessel as pressure acquiring mechanism.
Two transmitters share a ring casing gas-liquid isolation pressure vessel in the pressure of throat.Pressure unit is equipped with in the porch, upstream, and the pressure guiding pipe of this transmitter can be drawn by the upstream pressure guiding pipe bypass of the first differential pressure transmitter, and temperature transmitter is fixed on the device downstream, is used for measuring the temperature in pipeline.
as shown in Figure 1, the utility model device, measuring channel is the Venturi meter road, the utility model device is in upstream and throat's 9 pressures respectively, be connected on the first differential pressure transmitter 21, in downstream and throat's 9 pressures respectively, be connected on the second differential pressure transmitter 22, namely in the upstream of measuring channel, throat 9 and downstream part arrange three pressure points, each pressure point is fixed the pressure chamber 5 of a ring casing structure, rear differential pressure with the pressure position on the straight length of downstream as high end pressure, throat's pressure position is as low end pressure, distance between the pressure of high end pressure and the outlet of expansion pipeline section is 5 ~ 9 times of internal diameter of the pipeline, throat's pressure position is positioned at the middle and lower reaches of throat.Different according to the range ability demand, throat length is between 4 ~ 8 times of throat diameter.The expansion angle of expansion segment is 3 ~ 6 °; The throttling ratio is between 0.35 ~ 0.7; Near moisture device upstream straight length entrance, pressure unit is housed, the pressure guiding pipe of this pressure unit is identical with the pressure position, upstream of the first transmitter, and shares a ring casing gas-liquid isolation pressure vessel.
Referring to Fig. 1-3, the utility model moisture device adopts ring casing gas-liquid isolation pressure vessel 5 to carry out pressure survey, can realize effectively that not only gas-liquid isolation and efficient are high.Totally three of pressure vessels lay respectively at upstream, throat and the downstream in Venturi meter road 10, with the body coaxial design of measurement mechanism, are compound in measurement mechanism pressure position outer wall, but implement device entire system gravity balance.
the concrete structure of ring casing gas-liquid isolation pressure vessel is: offer four pressure ports 12 on the measuring channel 10 pressures place conplane tube wall vertical with axis, two, horizontal direction maximum gauge place, two, place, vertical direction maximal value footpath, fix a ring casing structure in the periphery of four pressure ports 12, this ring casing is coaxial with measuring channel 10 bodies, be fixed on measuring channel 10 body pressure place outer walls, formation has the gas-liquid isolated chamber 11 in certain capacity space, offer the impulse mouth that connects external pressure guiding pipe 6 above the chamber vertical axis, the impulse mouth is not on the plane at four pressure port 12 places, prevent that orifice jet from directly spraying into external pressure guiding pipe, be provided with blow-off pipe 7 below the chamber vertical axis, connect the blowdown apparatus such as blowoff valve.The chamber internal diameter is between 1.1～2.5 times of measurement mechanism trunk line internal diameter, chamber interior length be measurement mechanism trunk line internal diameter 0.8 times ~ 2.5 between.The ratio of the aperture of pressure port and internal diameter of the pipeline is between 0.05 ~ 0.15, and the ratio of the height of pressure port and internal diameter of the pipeline is between 0.06 ~ 0.2.The external mudhole of pressure vessel and inner pressure port not in one plane, the blow-off pipe direction is straight down.
Claims (5)
1. two differential pressure flux of moisture measurement mechanisms based on the long throat venturi, comprise the Venturi meter road, the first differential pressure transmitter and the second differential pressure transmitter, it is characterized in that, the throat length in described Venturi meter road is between 4 ~ 8 times of throat diameter, upstream in the Venturi meter road, throat's middle and lower reaches position and downstream part respectively arrange pressure place, offer four inner pressure ports on each pressure place in Venturi meter road conplane tube wall vertical with axis, two, horizontal direction maximum gauge place, two, place, vertical direction maximal value footpath, fix a ring casing structure in the periphery of four inner pressure ports, this ring casing is coaxial with Venturi meter road body, be fixed on Venturi meter road body pressure place outer wall, formation has the gas-liquid isolated chamber in certain capacity space, offer the impulse mouth that connects external pressure guiding pipe above the chamber vertical axis, offer the sewage draining exit that connects external blow-off pipe below the chamber vertical axis, receive respectively the first differential pressure transmitter from the external pressure guiding pipe that upstream and two of the positions pressure of throat's middle and lower reaches pick out, receive respectively the second differential pressure transmitter from the external pressure guiding pipe that the position pressure of throat's middle and lower reaches and pressure place of two, downstream pick out, the external pressure guiding pipe that picks out from the upstream pressure is also connected to a pressure unit.
2. moisture two-phase flowmeter device according to claim 1, is characterized in that, impulse mouth and sewage draining exit all with four inner pressure ports not in one plane.
3. moisture two-phase flowmeter device according to claim 1, it is characterized in that, the internal diameter of described ring casing is between 1.1～2.5 times of Venturi meter road internal diameter, the chamber interior length be the measurement mechanism internal diameter 0.8 times ~ 2.5 between, the aperture of inner pressure port and the ratio of internal diameter of the pipeline are between 0.05 ~ 0.15, and the ratio of the height of inner pressure port and internal diameter of the pipeline is between 0.06 ~ 0.2.
4. moisture two-phase flowmeter device according to claim 1, is characterized in that, the expansion angle of Venturi meter road expansion segment is 3 ~ 6 °.
5. moisture two-phase flowmeter device according to claim 1, is characterized in that, downstream pressure place is 59 times of internal diameter of the pipeline apart from the distance between the outlet of venturi expansion pipeline section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220609952 CN202994216U (en) | 2012-11-15 | 2012-11-15 | Double differential pressure wet gas flow measuring device based on long throat neck venturi tube |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220609952 CN202994216U (en) | 2012-11-15 | 2012-11-15 | Double differential pressure wet gas flow measuring device based on long throat neck venturi tube |
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| CN202994216U true CN202994216U (en) | 2013-06-12 |
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| CN 201220609952 Expired - Fee Related CN202994216U (en) | 2012-11-15 | 2012-11-15 | Double differential pressure wet gas flow measuring device based on long throat neck venturi tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048019A (en) * | 2012-11-15 | 2013-04-17 | 天津大学 | Double differential pressure moisture flow measuring device based on long-throat-neck venturi |
| CN105387895A (en) * | 2015-10-16 | 2016-03-09 | 中国石油天然气股份有限公司规划总院 | Long-throat-and-neck venturi tube moisture flow measurement method based on flowing density |
| CN113324696A (en) * | 2021-06-22 | 2021-08-31 | 中国核动力研究设计院 | Back-flushing isolation device of nuclear reactor differential pressure and pressure transmitter and maintenance method |
-
2012
- 2012-11-15 CN CN 201220609952 patent/CN202994216U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048019A (en) * | 2012-11-15 | 2013-04-17 | 天津大学 | Double differential pressure moisture flow measuring device based on long-throat-neck venturi |
| CN103048019B (en) * | 2012-11-15 | 2016-05-04 | 天津大学 | Based on two differential pressure flux of moisture measurement mechanisms of long throat venturi |
| CN105387895A (en) * | 2015-10-16 | 2016-03-09 | 中国石油天然气股份有限公司规划总院 | Long-throat-and-neck venturi tube moisture flow measurement method based on flowing density |
| CN105387895B (en) * | 2015-10-16 | 2018-06-19 | 中国石油天然气股份有限公司规划总院 | Long throat Venturi tube flux of moisture measuring method based on flow density |
| CN113324696A (en) * | 2021-06-22 | 2021-08-31 | 中国核动力研究设计院 | Back-flushing isolation device of nuclear reactor differential pressure and pressure transmitter and maintenance method |
| CN113324696B (en) * | 2021-06-22 | 2022-03-18 | 中国核动力研究设计院 | Method for maintaining back-flushing isolation device of nuclear reactor differential pressure and pressure transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20161115 |