CN108489560B - Vertical venturi moisture measuring device based on porous ring chamber pressure sampler - Google Patents
Vertical venturi moisture measuring device based on porous ring chamber pressure sampler Download PDFInfo
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- CN108489560B CN108489560B CN201810387070.5A CN201810387070A CN108489560B CN 108489560 B CN108489560 B CN 108489560B CN 201810387070 A CN201810387070 A CN 201810387070A CN 108489560 B CN108489560 B CN 108489560B
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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
- G01F1/36—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 the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to a vertical Venturi moisture measuring device based on a porous annular chamber pressure taking device, which comprises a Venturi tube fixed on a vertical pipeline, wherein pressure taking parts are respectively arranged at the upstream, the throat and the downstream of the Venturi tube, one pressure taking device is fixed on each pressure taking part, each pressure taking device comprises a pressure taking device shell covering the pressure taking part and an internal pressure guide tube, the pressure taking part is close to the lower part of the pressure taking device shell, pressure taking grooves or porous radial pressure taking ports which are uniformly distributed are formed in the periphery of the pressure taking part, an annular pressure guide channel is reserved between a throttling device at the pressure taking part and the pressure taking device shell, and the pressure taking grooves or the pressure taking ports enable a medium channel in the throttling device and the annular pressure guide channel to be communicated with each other; and an inner concealed pressure guide pipe communicated with the annular pressure guide channel is arranged in the pressure taking device shell. The invention can prevent the pressure guide pipe from being blocked by liquid to generate a liquid column, thereby ensuring the reliable measurement of pressure and differential pressure.
Description
Technical Field
The invention relates to the technical field of multiphase flow measurement, in particular to a metering technology for measuring moisture two-phase flow by adopting a Venturi.
Background
In the industrial processes of natural gas collection, transportation and the like, condensate oil, formation water and other liquid media are often accompanied in a pipeline. When the gas phase is a continuous phase and the liquid phase is a discrete phase, the flowing state is moisture. The accurate metering of the flow of each phase in the wet gas flow has important practical significance. The flow measuring method based on the differential pressure principle is widely applied, and particularly, the method takes a venturi as a throttling device and is widely applied. In a conventional pressure measuring device, a pressure pipe is connected to a single pressure measuring hole on a pipe wall or a ring chamber. Part 4 of the full pipe fluid flow rate was measured according to GB/T2624.4 "with a differential pressure device installed in a circular section pipe: venturi tube, the diameter of the pressure tapping hole is in the range of 4 mm-10 mm and is related to the pipe diameter and the throttling ratio, for example, DN50 the diameter of the pressure tapping hole at the upstream of the Venturi tube is only allowed to be 4 mm-5 mm. The above-described conventional pressure sampler structure is suitable for measurement of a single-phase fluid and a horizontal wet gas flow rate, but not suitable for measurement of a vertical wet gas flow rate. Through experimental observation, when moisture vertically flows through a DN50 annular chamber pressure-taking venturi which meets the standard, a liquid column with the height changing along with time is formed in the pressure-guiding pipe, and errors are brought to the measurement of differential pressure.
Disclosure of Invention
The invention provides a vertical Venturi moisture measuring device based on a porous ring chamber pressure sampler, which can prevent a pressure guide pipe from being blocked by liquid to generate a liquid column, thereby ensuring the reliable measurement of pressure and differential pressure. In order to solve the technical problems, the invention adopts the technical scheme that:
a vertical Venturi moisture measuring device based on a porous annular chamber pressure taking device comprises a Venturi tube fixed on a vertical pipeline, wherein pressure taking parts are respectively arranged at the upstream, the throat and the downstream of the Venturi tube, and one pressure taking device is fixed on each pressure taking part; and an inner concealed pressure guide pipe communicated with the annular pressure guide channel is arranged in the pressure taking device shell.
Preferably, a step or a slope for accelerating the backflow of the liquid and reducing the deposition of contaminants is provided at the bottom of the annular pressure guide channel.
The invention adopts long pressure taking groove or porous radial pressure taking opening to take pressure on each cross section of the Venturi, the outside of the pressure taking opening is wrapped with an annular pressure guide channel, and the top of the pressure guide channel is connected with a pressure and differential pressure sensor through an internal pressure guide pipe, thus realizing the measurement of pressure and differential pressure. The working principle is that compared with the traditional pressure taking mode, the scheme increases the sectional area of the pressure taking port by increasing the length or the number of the pressure taking ports, and provides a chance for liquid entering the pressure guide channel through the pressure taking ports to flow back to a pipeline; the annular pressure guide channel has a larger sectional area, can also avoid the blockage of liquid, and the bottom of the channel is provided with a step or a slope for accelerating the backflow of the liquid and reducing the deposition of dirt; the volume of the pressure guide channel is large, and the pressure guide channel can provide a buffer effect on pressure pulsation caused by liquid rushing in and flowing out; only gas-phase medium is arranged at the top of the pressure guide channel, and the built-in pressure guide pipe guides the pressure of the gas-phase medium to the pressure/differential pressure sensor to realize measurement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a pressure measuring device with a long pressure measuring groove at a pressure measuring portion of a venturi according to an embodiment of the present invention.
Fig. 2 is a schematic view of a pressure measuring device with radial pressure measuring ports at a pressure measuring portion of a venturi according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of a pressure measuring device with a long pressure measuring groove at a pressure measuring portion of a venturi according to an embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of a pressure measuring device with radial pressure measuring ports at a pressure measuring portion of a venturi according to an embodiment of the present invention.
FIG. 5 is a schematic view of each pressure-taking part of a venturi according to an embodiment of the present invention.
The drawings illustrate the following: 1-venturi pressure taking part, 2-long pressure taking groove, 3-porous radial pressure taking port, 4-medium channel, 5-annular pressure guide channel, 6-pressure taking device shell, 7-step, 8-built-in pressure guide tube, 9-pressure sensor, 10-venturi upstream pressure taking part, 11-venturi throat pressure taking part, 12-venturi downstream pressure taking part
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Likewise, the following examples are only some but not all examples of the present invention, and all other examples obtained by those skilled in the art without any inventive step are within the scope of the present invention.
Referring to fig. 1 and 2, fig. 1 and 2 are schematic diagrams of a pressure measuring device at a pressure measuring portion of a venturi according to an embodiment of the present invention. Here, the pressure measurement is taken as an example, and the differential pressure can be measured by using the pressure sampler in combination.
The moisture flows through a venturi, which is vertically mounted, with the media flow direction from bottom to top. On a certain pressure taking part 1 of the Venturi, 4 long pressure taking grooves 2 are adopted in figure 1, 20 radial pressure taking ports 3 are adopted in figure 2, and the length of each groove or hole along the axial direction is 5mm, so that the medium channel 4 is communicated with the annular pressure guide channel 5. The annular pressure guide channel 5 is formed by enclosing the outer wall near the pressure taking part 1 and the inner wall of the pressure taking device shell 6, the bottom of the annular pressure guide channel is provided with a step 7 or a slope for facilitating liquid backflow and sewage discharge, the upper part of the annular pressure guide channel 5 is connected with an internal pressure guide pipe 8, and the internal pressure guide pipe guides the pressure at the taken position to a pressure sensor 9 to realize pressure measurement.
Referring to FIG. 5, FIG. 5 is a schematic diagram of pressure extraction locations of a venturi in accordance with an embodiment of the present invention. The pressure measuring device is suitable for all three pressure measuring parts of the Venturi shown in figure 5, namely an upstream pressure measuring part 10, a throat pressure measuring part 11 and a downstream pressure measuring part 12.
The above description is only a part of the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, improvements or equivalent changes made within the scope of the design concept of the present invention are included in the protection scope of the present invention.
Claims (1)
1. A vertical Venturi moisture measuring device based on a porous ring chamber pressure sampler comprises a Venturi tube fixed on a vertical pipeline, the upstream, the throat and the downstream of the Venturi tube are respectively provided with a pressure taking part, each pressure taking part is fixed with a pressure taking device, it is characterized in that the pressure measuring device comprises a pressure measuring device shell for coating a pressure measuring part and an internal pressure guide pipe, the pressure measuring part is close to the lower part of the pressure measuring device shell, long pressure measuring grooves or porous radial pressure measuring openings which are uniformly distributed are arranged around the pressure measuring part for one circle, an annular pressure guide channel is reserved between the throttling device at the pressure taking position and the pressure taking device shell, the annular pressure guide channel is formed by enclosing the outer wall near the pressure taking position and the inner wall of the pressure taking device shell, the bottom of the annular pressure guide channel is provided with a step or a slope for accelerating the backflow of liquid and reducing the deposition of dirt; the long pressure taking groove or the pressure taking port enables a medium channel in the throttling device to be communicated with the annular pressure guide channel; and an inner concealed pressure guide pipe communicated with the annular pressure guide channel is arranged in the pressure taking device shell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810387070.5A CN108489560B (en) | 2018-04-26 | 2018-04-26 | Vertical venturi moisture measuring device based on porous ring chamber pressure sampler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810387070.5A CN108489560B (en) | 2018-04-26 | 2018-04-26 | Vertical venturi moisture measuring device based on porous ring chamber pressure sampler |
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| Publication Number | Publication Date |
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| CN108489560A CN108489560A (en) | 2018-09-04 |
| CN108489560B true CN108489560B (en) | 2020-03-06 |
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| CN201810387070.5A Active CN108489560B (en) | 2018-04-26 | 2018-04-26 | Vertical venturi moisture measuring device based on porous ring chamber pressure sampler |
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| CN115628789B (en) * | 2022-12-21 | 2023-07-11 | 成都中油翼龙科技有限责任公司 | Three-phase flow non-separation on-line metering device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201034650Y (en) * | 2007-04-20 | 2008-03-12 | 项家从 | Semi-ring voltage equalizing type ring casing pressure sampling stephanoporate shaped hole plate flow rate sensor |
| CN102928029A (en) * | 2012-11-15 | 2013-02-13 | 天津大学 | Moisture two-phase flow measuring device with annular chamber gas-liquid separation pressure measuring device |
| CN105424106A (en) * | 2015-11-04 | 2016-03-23 | 西安交通大学 | V-cone flowmeter vertical installation structure |
| CN208091504U (en) * | 2018-04-26 | 2018-11-13 | 天津大学 | Vertical venturi moisture measuring device based on porous ring casing pressure vessel |
-
2018
- 2018-04-26 CN CN201810387070.5A patent/CN108489560B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201034650Y (en) * | 2007-04-20 | 2008-03-12 | 项家从 | Semi-ring voltage equalizing type ring casing pressure sampling stephanoporate shaped hole plate flow rate sensor |
| CN102928029A (en) * | 2012-11-15 | 2013-02-13 | 天津大学 | Moisture two-phase flow measuring device with annular chamber gas-liquid separation pressure measuring device |
| CN105424106A (en) * | 2015-11-04 | 2016-03-23 | 西安交通大学 | V-cone flowmeter vertical installation structure |
| CN208091504U (en) * | 2018-04-26 | 2018-11-13 | 天津大学 | Vertical venturi moisture measuring device based on porous ring casing pressure vessel |
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Effective date of registration: 20210621 Address after: 1805-1808, Hetong building, north of the middle section of Anshan West Road, Nankai District, Tianjin (Science and Technology Park) Patentee after: TIANJIN TJ.UNI TAIHE AUTOMATION CONTROL & INSTRUMENT Co.,Ltd. Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |
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