CN112763684B - Mixing device for wet natural gas detection and wet natural gas detection system - Google Patents
Mixing device for wet natural gas detection and wet natural gas detection system Download PDFInfo
- Publication number
- CN112763684B CN112763684B CN201911065739.XA CN201911065739A CN112763684B CN 112763684 B CN112763684 B CN 112763684B CN 201911065739 A CN201911065739 A CN 201911065739A CN 112763684 B CN112763684 B CN 112763684B
- Authority
- CN
- China
- Prior art keywords
- pipe
- natural gas
- test
- pipeline
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels, explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a mixing device for wet natural gas detection and a wet natural gas detection system, wherein the mixing device comprises: the inner layer pipe is provided with an air inlet end and an air outlet end, and the air inlet end is used for being communicated with a natural gas pipeline; the outer layer pipe of suit on the inlayer pipe, the inlayer pipe with have annular space between the outer pipe, have the notes liquid mouth on the lateral wall of outer pipe, the one end of inlayer pipe with the lateral wall sealing connection of inlayer pipe, it is located to give vent to anger the end the outer intraductal portion of outer. The invention can quickly form wet natural gas with annular flow state, which is beneficial to improving the accuracy of detection results.
Description
Technical Field
The invention relates to the technical field of natural gas testing, in particular to a mixing device for wet natural gas detection and a wet natural gas detection system.
Background
Natural gas is an important clean energy source, and the demand of the natural gas is increasing. In natural gas production, the gas obtained from the wellhead is typically wet natural gas containing liquids (e.g., water, hydrocarbon liquids). In order to improve the quality of the exploitation, it is necessary to accurately detect the flow of wet natural gas.
The existing wet natural gas detection device adopts air and water as test media, and when the mixed gas for testing is prepared, the air and the water are injected into the same container at the same time to be fully mixed, and the mixed air and the water are introduced into the wet natural gas detection device for detection.
However, the flow characteristic of wet natural gas is that gas is dominant, the gas pushes liquid to flow, the flowing mode is that the gas is in the center of a pipeline, the liquid flows around the pipe wall in a ring shape, and the flowing state of mixed gas prepared by injecting air and water into the same container at the same time is greatly different from the flowing state of the ring-shaped flow, so that deviation and poor accuracy of a detection result are easy to occur.
Disclosure of Invention
The embodiment of the invention provides a mixing device for wet natural gas detection and a wet natural gas detection system, which can quickly form the wet natural gas with annular flow state, and are beneficial to improving the accuracy of detection results.
The technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a mixing device for wet natural gas detection, the mixing device including: the inner layer pipe is provided with an air inlet end and an air outlet end, and the air inlet end is used for being communicated with a natural gas pipeline; the outer layer pipe of suit on the inlayer pipe, the inlayer pipe with have annular space between the outer pipe, have the notes liquid mouth on the lateral wall of outer pipe, the one end of inlayer pipe with the lateral wall sealing connection of inlayer pipe, it is located to give vent to anger the end the outer intraductal portion of outer.
In one implementation manner of the embodiment of the invention, the outer layer pipe comprises a first pipe section and a second pipe section which are communicated, one end of the first pipe section is in sealing connection with the side wall of the inner layer pipe, the pipe diameter of the first pipe section is larger than that of the second pipe section, and the liquid injection port is positioned on the first pipe section.
In another implementation manner of the embodiment of the invention, a first flange is arranged on the outer side wall of the inner layer pipe, a second flange is arranged at one end of the outer layer pipe, and the first flange and the second flange are connected in a sealing mode.
In another implementation manner of the embodiment of the present invention, the inner layer pipe includes a third pipe section and a fourth pipe section, the first flange is located at an end of the third pipe section opposite to the fourth pipe section, an outer flange is located at an end of the fourth pipe section opposite to the third pipe section, one end face of the outer flange abuts against the first flange, and the other end face of the outer flange abuts against the second flange.
In another implementation manner of the embodiment of the present invention, the mixing device further includes: the device comprises a first measuring unit for measuring the natural gas flow flowing into the inner layer pipe and a second measuring unit for measuring the liquid flow flowing into the outer layer pipe, wherein the first measuring unit is positioned on a pipeline communicated with the air inlet end of the inner layer pipe, and the second measuring unit is positioned on a pipeline communicated with the liquid injection port.
In another implementation manner of the embodiment of the present invention, the mixing device further includes: a first regulating unit for regulating the flow rate and/or pressure of natural gas flowing into the inner layer pipe and a second regulating unit for regulating the flow rate and/or pressure of liquid flowing into the outer layer pipe, wherein the first regulating unit is positioned on a pipeline communicated with the air inlet end of the inner layer pipe, and the second regulating unit is positioned on a pipeline communicated with the liquid injection port.
In another aspect, an embodiment of the present invention provides a detection system for detecting wet natural gas prepared by the mixing device as described above, including: the device comprises a mixing device, a testing cabin and a testing pipeline, wherein the testing pipeline is communicated with the other end of an outer layer pipe of the mixing device, a transparent window is arranged on the side wall of the testing cabin, the testing pipeline comprises a first pipe wall and a second pipe wall, two dividing lines of the first pipe wall and the second pipe wall extend along the axial direction of the testing pipeline, the first pipe wall is a transparent side wall, the second pipe wall is a non-transparent side wall, and the first pipe wall is opposite to the transparent window.
In another implementation manner of the embodiment of the present invention, a central angle corresponding to the circular arc where the first pipe wall is located is 180 ° to 240 °, or a central angle corresponding to the circular arc where the first pipe wall is located is 15 ° to 60 °.
In another implementation manner of the embodiment of the invention, the transparent window is arc-shaped, the central angle corresponding to the arc where the transparent window is positioned is not smaller than the central angle corresponding to the arc where the first pipe wall is positioned,
or, the transparent window comprises a first window plate and a second window plate, wherein the side edges of the first window plate are connected with the side edges of the second window plate, the distance between the side edges of the first window plate, which are opposite to the side edges of the second window plate, and the distance between the side edges of the second window plate, which are opposite to the side edges of the first window plate, are not smaller than the diameter of the test pipeline.
In another implementation of an embodiment of the invention, the detection system further comprises a separation unit for separating the liquid of the wet natural gas, the separation unit being located on a line communicating with the test conduit.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the detection system comprises an inner layer pipe communicated with a natural gas pipeline and an outer layer pipe sleeved on the inner layer pipe, an annular space is formed between the inner layer pipe and the outer layer pipe, and a liquid injection port is formed in the side wall of the outer layer pipe.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a mixing device for wet natural gas detection according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mixing device for wet natural gas detection according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a mixing device for wet natural gas detection according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a mixing device for wet natural gas detection according to an embodiment of the present invention;
FIG. 5 is a block diagram of a wet natural gas detection system according to an embodiment of the present invention;
FIG. 6 is a block diagram of another wet natural gas detection system according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of the position of a test pod and test tubing according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a test pipeline according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a test pipeline according to an embodiment of the present invention;
fig. 10 is a schematic structural view of a test chamber according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a mixing device for wet natural gas detection according to an embodiment of the present invention. As shown in fig. 1, the mixing device includes: the inner layer pipe 1 and the outer layer pipe 2 sleeved on the inner layer pipe 1, wherein the inner layer pipe 1 is provided with an air inlet end 1a and an air outlet end 1b, and the air inlet end 1a is used for communicating with a natural gas pipeline; an annular space 10 is formed between the inner layer pipe 1 and the outer layer pipe 2, a liquid injection port 20 is formed in the side wall of the outer layer pipe 2, one end of the outer layer pipe 2 is connected with the side wall of the inner layer pipe 1 in a sealing mode, and the air outlet end 1b is located inside the outer layer pipe 2.
Wherein, the inner tube 1 is located inside the outer tube 2 means that the other end of the outer tube 2 protrudes from the inner tube 1 along the axial direction of the outer tube 2, that is, the outer tube 2 wraps the air outlet end 2 therein.
The detection system comprises an inner layer pipe communicated with a natural gas pipeline and an outer layer pipe sleeved on the inner layer pipe, an annular space is formed between the inner layer pipe and the outer layer pipe, and a liquid injection port is formed in the side wall of the outer layer pipe.
As shown in fig. 2, the outer tube 2 comprises a first tube section 21 and a second tube section 22 which are communicated, one end of the first tube section 21 is in sealing connection with the side wall of the inner tube 1, the tube diameter of the first tube section 21 is larger than that of the second tube section 22, and the liquid injection port 20 is positioned in the first tube section 21. In this embodiment, the connection portion between the first pipe section 21 and the second pipe section 22 has a first transition pipe section 24, the first transition pipe section 24 is a pipe with gradually changing pipe diameter, and the pipe diameter from one end of the first transition pipe section 24 connected with the first pipe section 21 to one end of the first transition pipe section 24 connected with the second pipe section 22 is gradually reduced. In this way, more liquid can be buffered in the first pipe section 21 and then buffered through the first transition pipe section 24 into the second pipe section 22, so that the liquid in the outer pipe 2 flows steadily.
Illustratively, the pipe diameter of the first pipe segment 21 may range from 100mm to 140mm, for example, the pipe diameter of the first pipe segment 21 may be 130±5mm. The included angle between the generatrix of the first transition section 24 and the axis may range from 30 ° to 50 °, for example, the included angle between the generatrix of the first transition section 24 and the axis may be 40±2°. The pipe diameter of the second pipe section 22 may be in the range of 75mm to 90mm, for example, the pipe diameter of the second pipe section 22 may be 78±2mm, wherein the length of the second pipe section 22 may be not less than 330mm so that the liquid has a sufficient buffer distance before entering the inner pipe 1.
As shown in fig. 3, the side wall of the inner tube 1 has a first flange 11, and one end of the outer tube 2 has a second flange 23, and the first flange 11 and the second flange 23 are hermetically connected. The inner layer pipe 1 and the outer layer pipe 2 can be conveniently and quickly connected through the first flange 11 and the second flange 23, and meanwhile, the sealing connection of the first flange 11 and the second flange 23 can prevent liquid in the outer layer pipe 2 from flowing out of the outer layer pipe 2 from one end of the outer layer pipe 2.
As shown in fig. 4, the inner tube 1 includes a third tube segment 12 and a fourth tube segment 13, the first flange 11 is located at an end of the third tube segment 12 opposite to the fourth tube segment 13, an end of the fourth tube segment 13 opposite to the third tube segment 12 has an outer flange 14, an outer diameter of the outer flange 14 is not smaller than an inner diameter of the outer tube 2, and the outer flange 14 is located between the first flange 11 and the second flange 23 such that one end face of the outer flange 14 abuts against the first flange 11 and the other end face of the outer flange 14 abuts against the second flange 23. In this embodiment, the inner tube 1 adopts a two-section structure of the third tube section 12 and the fourth tube section 13, where the fourth tube section 13 is located inside the outer tube 2, the third tube section 12 is located outside the outer tube 2, the fourth tube section 13 is provided with an outer flange 14, the first flange 11 and the second flange 23 can be fixedly connected through bolts, the outer flange 14 can fix the fourth tube section 13 in the outer tube 2 under the clamping of the first flange 11 and the second flange 23, and the arrangement of the outer flange 14 can also improve the tightness between the first flange 11 and the second flange 23. Simultaneously, the first flange 11 and the second flange 23 are used for axial limiting, so that the inner layer pipe 1 can be conveniently and quickly assembled and disassembled.
Optionally, the fourth pipe section 13 has a second transition pipe section 15 at one end with an outer flange 14, the pipe diameter of the second transition pipe section 15 gradually decreases from the end of the second transition pipe section 15 connected with the outer flange 14 to the other end of the second transition pipe section 15, and natural gas can smoothly flow from the third pipe section 12 into the fourth pipe section 13 by the buffering action of the second transition pipe section 15. The other end of the fourth pipe section 13 is provided with a third transition pipe section 16, the pipe diameter from one end of the third transition pipe section 16 close to the outer flange 14 to the other end of the third transition pipe section 16 gradually becomes larger, and natural gas can be smoothly gathered into the outer pipe 2 from the inner pipe 1 through the buffer function of the third transition pipe section 16, so that liquid and natural gas can be fully mixed.
Illustratively, the length of the third tube segment 12 may range from 100mm to 140mm, for example, the length of the third tube segment 12 may be 115+ -5 mm, the tube diameter of the third tube segment 12 may range from 75mm to 90mm, for example, the tube diameter of the third tube segment 12 may be 78+ -2 mm. The angle of the generatrix of the second transition pipe section 15 to the axis may be 12 ° to 16 °, for example, the angle of the generatrix of the second transition pipe section 15 to the axis may be 13.5±0.5°. The length of the fourth pipe section 13 may have a value ranging from 350mm to 450mm, for example, the length of the fourth pipe section 13 may be 390±10mm, the pipe diameter of the fourth pipe section 13 may be 65mm to 73mm, for example, the pipe diameter of the fourth pipe section 13 may be 69±1mm. The angle of the generatrix of the third transition pipe section 16 to the axis may be 8 ° to 12 °, for example, the angle of the generatrix of the second transition pipe section 15 to the axis may be 9.5±0.5°.
Fig. 5 is a block diagram of a wet natural gas detection system according to an embodiment of the present invention, and as shown in fig. 5, the wet natural gas detection system includes a mixing device a and a detection pipe 4 connected to the other end of the outer pipe 2 of the mixing device a, where the detection pipe 4 is used to convey the mixed wet natural gas into a test pipe 5 for detection. Wherein the mixing device a further comprises: a first measuring unit 31 for measuring the natural gas flow rate flowing into the inner tube 1 and a second measuring unit 32 for measuring the liquid flow rate flowing into the outer tube 2, the first measuring unit 31 being located on a line communicating with the gas inlet end 1a of the inner tube 1, the second measuring unit 32 being located on a line communicating with the liquid filling port 20. The flow of the natural gas flowing into the inner pipe 1 can be measured by arranging the first measuring unit on the pipeline communicated with the inner pipe 1, and the flow of the liquid flowing into the outer pipe 2 can be measured by arranging the second measuring unit 32 on the pipeline communicated with the liquid injection port 20, so that the mixing ratio of the natural gas and the liquid can be controlled, and the detection of wet natural gas with various different ratios can be realized. After the required wet natural gas is formed, the wet natural gas can enter a detection pipeline to detect the wet natural gas.
The first measuring unit 31 and the second measuring unit 32 may be flow meters, by which the flow rate of the natural gas into the inner pipe 1 and the flow rate of the liquid into the outer pipe 2 may be determined, for example, in order to precisely control the liquid content of the wet natural gas for detection, so as to achieve detection of the wet natural gas of various different liquid ratios.
Fig. 6 is a block diagram of another wet natural gas detection system according to an embodiment of the present invention. As shown in fig. 6, the mixing device a in the detection system further includes: a first regulating unit 71 for regulating the flow rate and/or pressure of the natural gas flowing into the inner pipe 1 and a second regulating unit 72 for regulating the flow rate and/or pressure of the liquid flowing into the outer pipe 2, the first regulating unit 71 being located on a line communicating with the inlet end 1a of the inner pipe 1 and the second regulating unit 72 being located on a line communicating with the filling port 20. The first regulating unit 71 is provided to regulate the flow and/or pressure of the natural gas entering the inner pipe 1 so that the natural gas entering the inner pipe 1 has a stable flow and pressure. The second regulating unit 72 is arranged to regulate the flow and/or pressure of the liquid into the outer tube 2 such that the liquid into the outer tube 2 has a stable flow and/or pressure.
Illustratively, the first adjusting unit 71 may be adjusted by a pressure adjusting valve and a flow regulating valve including a plurality of different adjusting capacities connected in parallel to control the pressure and flow of the natural gas conveyed from the natural gas pipeline, the inlet of the first adjusting unit 71 may be in communication with the natural gas pipeline, and the outlet of the first adjusting unit 71 may be in communication with the first measuring unit 31 through a pipeline.
In this embodiment, the mixing device a may further include a liquid storage unit, where the liquid storage unit is communicated with the second measurement unit 32 through a pipe, and the second adjustment unit 72 is located on a pipeline between the liquid storage unit and the second measurement unit 32, where the second adjustment unit 72 can adjust the flow rate and/or the pressure of the liquid, and can make the adjusted liquid have a stable pressure and/or flow rate.
The embodiment of the invention provides a wet natural gas detection system, as shown in fig. 5, 6 and 7, which is used for detecting the wet natural gas prepared by the mixing device. The detection system comprises: the mixing device A, the test cabin 6 and the test pipeline 5 are provided with a transparent window 60 on the side wall of the test cabin 6, the test pipeline 5 comprises a first pipe wall 51 and a second pipe wall 52, two dividing lines of the first pipe wall 51 and the second pipe wall 52 extend along the axial direction of the test pipeline 5, the first pipe wall 51 is a transparent side wall, the second pipe wall 52 is a non-transparent side wall, and the first pipe wall 51 is opposite to the transparent window 60.
Wherein the outer tube 2 can communicate with the test tube 5 through the test tube 4. A plurality of testing devices for detecting wet natural gas are arranged in the detection pipeline 4. The device can be used for measuring various detections such as flow rate, section liquid content, manifold and the like of wet natural gas. The test device may be a flow meter, by means of which a measurement of the flow of wet natural gas may be achieved, for example.
The test pipeline is connected with the detection pipeline, so that wet natural gas mixed by the mixing device can enter the test pipeline to be detected. And because the test pipeline includes first pipe wall and second pipe wall, first pipe wall is transparent lateral wall, and the second pipe wall is non-transparent lateral wall, when testing wet natural gas in the test pipeline through particle imaging velocimetry equipment and laser Doppler velocimetry equipment promptly, can shine inside the test pipeline through first pipe wall, illuminate the test pipeline to make particle imaging velocimetry equipment and laser Doppler velocimetry equipment can test the test pipeline.
As shown in fig. 6, the detection system further comprises a separation unit 8 for separating the liquid of the wet natural gas, the separation unit 8 being located on a line communicating with the test pipeline 5. In this embodiment, the separation unit 8 can separate the wet natural gas after the test into natural gas and liquid, and recycle the natural gas. The liquid separated by the separation unit 8 can be wholly or partially returned to the liquid storage unit for recycling.
Optionally, the detection system further comprises a third adjusting unit 73, wherein the third adjusting unit 73 may comprise a plurality of pressure adjusting valves and flow pressure regulating valves connected in parallel, so that the third adjusting unit 73 can adjust the flow and/or the pressure of the natural gas separated by the separation unit 8 and convey the natural gas into a natural gas pipeline, a gas source or a natural gas conveying pipe network.
In one implementation, the central angle α corresponding to the arc in which the first pipe wall 51 is located may be 180 ° to 240 °. The pipeline is particularly suitable for a particle imaging velocimetry, because a certain amount of trace particles which move along with the fluid are required to be injected into the fluid during the particle imaging velocimetry test, and one test surface in a flow field is illuminated by adopting laser, in order to meet the requirement that the particle imaging velocimetry can shoot one test surface in a natural gas pipeline, the central angle alpha corresponding to the circular arc where the first pipe wall 51 is positioned is enough large, and the central angle alpha is set to be at least 180 degrees, so that the test surface shot by the particle imaging velocimetry can relate to the maximum axial cross section of the test pipeline 5, and the acquired flow field information of the natural gas pipeline is more comprehensive. In order to prevent the ambient light from irradiating the test pipeline 5, the central angle alpha is not more than 240 degrees, so that the ambient light positioned at the back of the first pipe wall 51 cannot irradiate the test pipeline 5, interference to a photographed test surface is avoided, and the accuracy of the test is improved.
For example, as shown in fig. 8, the central angle α corresponding to the circular arc where the first pipe wall 51 is located may be 210 °. The central angle can effectively reduce the influence of ambient light on the premise of ensuring that a particle imaging velocimetry method is met. Further, the central angle α may be an angle closer to 180 ° such as 195 °, so that the influence of ambient light can be minimized. In this embodiment, in order to enable the irradiated laser to illuminate the maximum axial cross section of the pipeline 5 to be tested, the particle imaging velocimetry method acquires the overall flow field information of the natural gas pipeline, that is, enables the laser to irradiate radially, and ensures that the optical path of the laser is always in the area of the first pipe wall 51, so that an axially extending bright surface can be formed in the pipeline 5, and the particle imaging velocimetry device can complete shooting of the bright surface through the first side wall.
It should be noted that the above-mentioned pipeline can also meet the requirement of the laser Doppler velocimetry, namely, the pipeline can be adopted to test the laser Doppler velocimetry and the particle imaging velocimetry simultaneously.
In another implementation of the present invention, the central angle corresponding to the arc where the first pipe wall 51 is located is 15 ° to 60 °. The pipeline is particularly suitable for a laser Doppler speed measurement method, and as the two coherent light waves are emitted by the emission source to form a measurement area in the laser Doppler speed measurement method, the pipeline is suitable for the pipeline of the laser Doppler speed measurement method, and only the central angle alpha corresponding to the circular arc of the first pipe wall 51 is required to be met to enable the two laser beams to pass through. In this embodiment, the central angle α corresponding to the arc where the first pipe wall 51 is located may be small enough, and the central angle α is set to be not smaller than 15 °, so that laser energy emitted by the laser doppler velocity measurement method enters the test pipe 5 through the first pipe wall 51, and the central angle α is not greater than 60 °, so that ambient light is prevented from being irradiated into the test pipe 5, interference of ambient light on laser doppler velocity measurement is avoided to the greatest extent, and accuracy of the test is improved.
As shown in fig. 9, the central angle of the arc on which the first pipe wall 51 is located is 60 °. The first pipe wall 51 can enable detection signals emitted by the laser Doppler speed measuring device, such as laser, to enter the test pipeline 5 filled with the natural gas to be tested through the first pipe wall 51, and meanwhile, after the laser entering the test pipeline 5 through the first pipe wall 51 irradiates the natural gas to be tested, the laser can be received by the laser Doppler speed measuring device again through the first pipe wall 51, so that the test of the laser Doppler speed measuring method is realized. The uncertainty can be reduced to 2% by using the pipeline for testing by the laser Doppler test method, so that the pipeline is more suitable for the laser Doppler speed measurement method.
In some embodiments, the light transmittance of the first tube wall 51 may be greater than the light transmittance of the second tube wall 52. By setting the light transmittance of the first pipe wall 51 to be greater than that of the second pipe wall 52, laser can be more emitted into the pipeline from the first pipe wall 51 during testing, and ambient light is prevented from being emitted into the pipeline from the second pipe wall 52, so that the testing accuracy is improved and interference is reduced.
It should be noted that, when testing the flow field and the flow velocity of the pipeline 5 body, a particle imaging velocimetry is required to be used for testing, in order to meet the requirement that the particle imaging velocimetry can shoot a testing surface in a natural gas pipeline, that is, the pipeline should be selected from the pipelines with the central angle alpha corresponding to the circular arc where the first pipe wall 51 is located being 180 ° to 240 °. When the flow velocity of the pipeline 5 body needs to be accurately tested, a laser Doppler test method needs to be adopted for testing, namely, the pipeline is selected from pipelines with 15-60 degrees of central angle corresponding to the circular arc where the first pipeline wall 51 is located.
Alternatively, the light transmittance of the first tube wall 51 may be not less than 80%, and the light transmittance of the second tube wall 52 may be not more than 40%. Illustratively, the light transmittance of the first tube wall 51 may be 90% and the light transmittance of the second tube wall 52 may be 20%. In order to make the light transmittance of the first pipe wall 51 and the second pipe wall 52 meet the above requirements, the test pipe 5 may employ an organic glass pipe, the light transmittance of which may be up to 80% or more, and at the same time, a transmission reducing layer for reducing the light transmittance may be provided on the inner wall or the outer wall of the second pipe wall 52. For example, the permeation reducing layer may be a frosted layer or a non-transparent film layer, a coating. Illustratively, the thickness of the non-transparent film layer, coating or matte layer may be no greater than 1mm, such as 0.8.+ -. 0.1mm. In this way, the environmental light entering from the second pipe wall 52 can be reduced, so as to prevent the influence of the environmental light and dust and the like outside the second pipe wall 52 on the test, and meanwhile, the reflected laser can cause interference on signal acquisition such as shooting, so that the test accuracy and precision can be improved.
In other embodiments, the light transmittance of the first tube wall 51 may be equal to the light transmittance of the second tube wall 52. I.e. the test tube 5 is a transparent tube, which may be made of plexiglas, although there is a part of the ambient light entering the test tube 5 from the second tube wall 52 for influencing the test, the transparent tube may be used for testing of the particle imaging velocimetry and the laser doppler velocimetry.
In this embodiment, when the particle imaging velocimetry device and the laser doppler velocimetry device are tested, the pressure of natural gas in the test pipeline 5 is higher, for example, 6MPa, the compressive strength of the test pipeline 5 can be determined according to the test requirement, and the pressure requirement can be achieved by adjusting the material, thickness and pipe diameter of the test pipeline 5.
When the laser Doppler velocimetry equipment and the particle imaging velocimetry equipment are adopted to test wet natural gas, the length of the test pipeline 5 can be processed according to the test requirement. For example, the length of the test tube 5 may be 0.5m, 1m or 1.5m.
In this embodiment, the surface area of the transparent window 60 is not smaller than the surface area of the first tube wall 51. As shown in fig. 7, the transparent window 60 is located at a corner of the test chamber 6, and the transparent window 60 is recessed in the test chamber 6, so that the test pipe 5 can be accommodated in the recess of the test chamber 6, and meanwhile, the transparent window 60 is opposite to the first pipe wall 51, and the surface area of the transparent window 60 is not smaller than the surface area of the first pipe wall 51, so that the transparent window 60 covers the first pipe wall 51 therein, and the first pipe wall 51 can be completely observed through the transparent window 60.
In one implementation manner of this embodiment, the transparent window 60 may be arc-shaped, and a central angle corresponding to the arc where the transparent window 60 is located is not smaller than a central angle corresponding to the arc where the first pipe wall 51 is located. The arc corresponding to the arc-shaped transparent window 60 may be concentric with the arc where the first pipe wall 51 is located, even if the transparent window 60 wraps the first pipe wall 51 therein, so that the first pipe wall 51 can be completely observed through the transparent window 60.
In another implementation manner of this embodiment, the transparent window 60 may include a first window plate 61 and a second window plate 62 connected by sides, where a distance between a side opposite to the side connected to the second window plate 62 on the first window plate 61 and the second window plate 62 is not smaller than a diameter of the test pipe 5, and a distance between a side opposite to the side connected to the first window plate 61 on the second window plate 62 and the first window plate 61 is not smaller than a diameter of the test pipe 5. Illustratively, the first window plate 61 is perpendicular to the second window plate 62, a side of the first window plate 61 opposite to a side connected to the second window plate 62 is spaced from the second window plate 62 by a distance not smaller than the diameter of the test tube 5, and a side of the second window plate 62 opposite to the side connected to the first window plate 61 is spaced from the first window plate 61 by a distance not smaller than the diameter of the test tube 5, so that the test tube 5 is enclosed in the transparent window 60 recessed in the test chamber 6.
In this embodiment, the distance between the first tube wall 51 and the transparent window 60 may be determined according to the position of the intersection point of the emitted laser light in the laser doppler test and the focal length photographed by the camera in the particle imaging test, so as to ensure the accuracy of the test.
Optionally, the detection system may further comprise a closure isolating the gap between the test tube 5 and the transparent window 60 from the outside. For example, the sealing piece can be shading cloth, dustproof cloth curtains and the like, and the sealing piece can prevent dust, water vapor, light and the like in the external environment from influencing flow field and flow velocity tests, so that the influence of external environment factors on measurement can be reduced, and the test accuracy is improved.
Alternatively, the transparent window 60 may have good light transmission properties, for example, the transparent window 60 may have a light transmission of 90%. Like this, in the particle imaging velocimetry equipment, laser Doppler velocimetry equipment transmitting laser can get into test pipeline 5 through transparent window 60 during the test, simultaneously good light transmission performance, when particle imaging velocimetry equipment, laser Doppler velocimetry equipment test, reflection and refraction that can reduce transparent window 60 avoid causing the influence to the test, improve the degree of accuracy.
Alternatively, as shown in fig. 10, the test compartment 6 may include: sealing unit, ventilation unit and power supply unit. The test chamber 6 is a closed chamber body, and a transparent window 60 is arranged on the side wall of the test chamber 6. The sealing unit includes a first isolation door 63 mounted on a side wall of the test compartment 6, and a second isolation door 64 located inside the test compartment 6, the second isolation door 64 isolating an inner space of the test compartment 6 into a test space 65 and a buffer space 66, the first isolation door 63 communicating with the buffer space 66. The ventilation unit includes air delivery device 91 and the pipeline with safe air supply intercommunication, and air inlet and the pipeline intercommunication of air delivery device 91, air delivery device 91's air outlet and test space 65 intercommunication.
The test cabin is a closed cabin body, so that the tightness of the test space is ensured to a certain extent, and the side wall of the test cabin is provided with a transparent window, so that the particle imaging test equipment and the laser Doppler test equipment in the test cabin can detect the test pipeline through the test cabin, and the visual function of the test cabin is realized. And sealing unit includes first isolation door and second isolation door, and the second isolation door is located inside the test cabin, and the second isolation door is with the inner space isolation in test cabin into test space and buffer space, and first isolation door and buffer space intercommunication when the staff business turn over test cabin for outside air can advance the buffer space, therefore make outside air can not get into test space easily, thereby prevent that the combustible gas that exists in the outside air from mixing into test space, improve the security in test cabin. And meanwhile, the ventilation unit is also arranged for introducing safe air into the test space, so that the air in the external environment of the test cabin can be effectively prevented from entering the test space, and the safety of the test cabin is enhanced.
Optionally, the ventilation unit further includes a pressure regulating device 92, where the pressure regulating device 92 is located in the test space 65, and the pressure regulating device 92 is configured to regulate the pressure in the test space 65 so that the pressure in the test space 65 is higher than the pressure of the external environment by at least a preset pressure value. The pressure regulating device 92 is in the test chamber and is capable of maintaining the air pressure of the test space 65 of the test chamber at a preset pressure value higher than the air pressure of the external environment. Illustratively, the pressure regulating device 92 may include an air compressor, a pressure detector for detecting the air pressure inside and outside the test cabin, and a controller for controlling the air compressor to operate according to the pressure difference between the air pressure inside and outside the test cabin after the air pressure inside and outside the test cabin is obtained by the controller, so as to regulate the air pressure inside the test cabin until the pressure difference between the air pressure inside and outside the test cabin reaches a preset pressure value. For example, the preset pressure value may be 50Pa. Because the air pressure in the test space 65 is higher than the air pressure of the external environment, toxic combustible gas is not easy to permeate into the test space 65, thereby playing the roles of explosion prevention and personal safety protection. The pressure regulating device 92 in this embodiment can provide a stable working environment for the test equipment to work, so as to improve the measurement accuracy.
Optionally, the ventilation unit further comprises an air conditioning device 93, the air conditioning device 93 being located in the test space 65, the air conditioning device 93 being for conditioning the temperature and humidity in the test space. The air conditioning device can be an explosion-proof air conditioner arranged in the test cabin, and the explosion-proof air conditioner can keep the temperature and the humidity in the test cabin stable. For example, the relative humidity in the test chamber may be maintained at 30% to 50% for reasons of operational requirements of the particle imaging velocimetry apparatus, laser doppler velocimetry apparatus. The temperature within the test compartment may be maintained at 20 ℃ to 26 ℃ for operational environmental comfort.
Optionally, the test pod further comprises a sliding unit for controlling the axial movement of the test pod along the test tube. The sliding unit enables the test cabin to flexibly move, and particle imaging velocimetry and laser Doppler velocimetry can be more flexible and accurate.
In this embodiment, the slide unit includes: the pulley seat is arranged at the bottom of the test cabin, the pulley is rotatably arranged on the pulley seat, and the extending direction of the sliding rail is the same as the axial direction of the pipeline to be tested. After the test cabin is moved to a preset position by the sliding unit, the pulley can be fixed on the sliding rail by the locking mechanism, so that relevant tests and observations can be carried out.
Optionally, a gas detector for detecting the concentration of the gas component and an alarm device are arranged in the test space, the alarm device is electrically connected with the gas detector, and the alarm device is used for sending out an alarm signal according to the detection result of the gas detector. The gas detector can detect gas concentration, smog and low air pressure, and the alarm device obtains the detection result and judges whether to alarm according to the detection result. The gas detector can detect at least one of oxygen concentration, methane concentration, carbon dioxide concentration, smoke and low air pressure in the test cabin, and the alarm device can send an alarm signal according to a detection result, so that the safety of staff and equipment can be effectively ensured. The alarm device can comprise an audible and visual alarm, and the audible and visual alarm can be respectively arranged outside the test cabin so as to warn under dangerous conditions.
The wet natural gas detection system provided by the invention can realize mixing of two phases of natural gas and liquid and generation of flow patterns in a shorter pipeline distance, can accelerate production of annular flow of the wet natural gas, reduces pressure loss in the gas-liquid mixing process, and provides more test pipeline lengths; according to the invention, the test pipeline is arranged behind the detection pipeline, so that the flowing state and the stable state of each phase of the wet natural gas in the detection pipeline can be effectively monitored, whether the detected wet natural gas is in the stable flowing state or not can be conveniently known, and the test accuracy is improved; the invention can intuitively observe the flow condition of wet natural gas in the pipeline and realize visual test.
The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.
Claims (9)
1. The utility model provides a detecting system of wet natural gas, its characterized in that, detecting system is used for detecting the wet natural gas that mixing arrangement prepared, includes: the device comprises a mixing device (A), a testing cabin (6) and a testing pipeline (5), wherein the testing pipeline (5) is communicated with the other end of an outer layer pipe (2) of the mixing device (A), a transparent window (60) is formed in the side wall of the testing cabin (6), the testing pipeline (5) comprises a first pipe wall (51) and a second pipe wall (52), two dividing lines of the first pipe wall (51) and the second pipe wall (52) extend along the axial direction of the testing pipeline (5), the first pipe wall (51) is a transparent side wall, the second pipe wall (52) is a non-transparent side wall, and the first pipe wall (51) is opposite to the transparent window (60);
the transparent window (60) is a concave structure, the concave structure is concave towards the inside of the test cabin (6), the cross section of the transparent window (60) is rectangular, the transparent window (60) is located at the corner position of the test cabin (6), the transparent window (60) comprises a first window plate (61) and a second window plate (62) which are connected with each other on the side, the distance between one side of the first window plate (61) opposite to the side of the second window plate (62) is not less than the diameter of the test pipeline (5), and the distance between one side of the second window plate (62) opposite to the side of the first window plate (61) is not less than the diameter of the test pipeline (5).
2. The wet natural gas detection system according to claim 1, wherein the central angle corresponding to the circular arc where the first pipe wall (51) is located is 180 ° to 240 °, or the central angle corresponding to the circular arc where the first pipe wall (51) is located is 15 ° to 60 °.
3. The wet natural gas detection system according to claim 1 or 2, characterized in that the detection system further comprises a separation unit (8) for separating the liquid of the wet natural gas, the separation unit (8) being located on a line communicating with the test line (5).
4. The wet natural gas detection system of claim 1, wherein the mixing device comprises:
an inner layer pipe (1), wherein the inner layer pipe (1) is provided with an air inlet end (1 a) and an air outlet end (1 b), and the air inlet end (1 a) is used for communicating with a natural gas pipeline;
the outer layer pipe (2) of suit on inlayer pipe (1), inlayer pipe (1) with have annular space (10) between outer layer pipe (2), have annotate liquid mouth (20) on the lateral wall of outer layer pipe (2), the one end of outer layer pipe (2) with lateral wall sealing connection of inlayer pipe (1), it is located to give vent to anger end (1 b) outer inside of pipe (2).
5. The wet natural gas detection system according to claim 4, wherein the outer tube (2) comprises a first tube section (21) and a second tube section (22) which are communicated, one end of the first tube section (21) is in sealing connection with the side wall of the inner tube (1), the tube diameter of the first tube section (21) is larger than the tube diameter of the second tube section (22), and the liquid injection port (20) is positioned in the first tube section (21).
6. The wet natural gas detection system according to claim 4, wherein the outer side wall of the inner tube (1) is provided with a first flange (11), one end of the outer tube (2) is provided with a second flange (23), and the first flange (11) and the second flange (23) are connected in a sealing manner.
7. The wet natural gas detection system according to claim 6, wherein the inner pipe (1) comprises a third pipe section (12) and a fourth pipe section (13), the first flange (11) is located at an end of the third pipe section (12) opposite to the fourth pipe section (13), an outer flange (14) is provided at an end of the fourth pipe section (13) opposite to the third pipe section (12), one end face of the outer flange (14) abuts against the first flange (11), and the other end face of the outer flange (14) abuts against the second flange (23).
8. The wet natural gas detection system of any one of claims 4 to 7, wherein the mixing device further comprises: a first measuring unit (31) for measuring the natural gas flow flowing into the inner pipe (1) and a second measuring unit (32) for measuring the liquid flow flowing into the outer pipe (2), wherein the first measuring unit (31) is positioned on a pipeline communicated with the air inlet end (1 a) of the inner pipe (1), and the second measuring unit (32) is positioned on a pipeline communicated with the liquid injection port (20).
9. The wet natural gas detection system of any one of claims 4 to 7, wherein the mixing device further comprises: a first regulating unit (71) for regulating the flow rate and/or pressure of natural gas flowing into the inner pipe (1) and a second regulating unit (72) for regulating the flow rate and/or pressure of liquid flowing into the outer pipe (2), wherein the first regulating unit (71) is positioned on a pipeline communicated with the air inlet end (1 a) of the inner pipe (1), and the second regulating unit (72) is positioned on a pipeline communicated with the liquid injection port (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065739.XA CN112763684B (en) | 2019-11-04 | 2019-11-04 | Mixing device for wet natural gas detection and wet natural gas detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065739.XA CN112763684B (en) | 2019-11-04 | 2019-11-04 | Mixing device for wet natural gas detection and wet natural gas detection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112763684A CN112763684A (en) | 2021-05-07 |
| CN112763684B true CN112763684B (en) | 2023-07-28 |
Family
ID=75692431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911065739.XA Active CN112763684B (en) | 2019-11-04 | 2019-11-04 | Mixing device for wet natural gas detection and wet natural gas detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112763684B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217698408U (en) * | 2022-06-01 | 2022-11-01 | 天津大学滨海工业研究院有限公司 | Boiler waste gas treatment equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002303300A (en) * | 2001-04-03 | 2002-10-18 | Daikin Ind Ltd | Ejector |
| CN101598666B (en) * | 2009-06-26 | 2010-09-08 | 中北大学 | Gas concentration detection system capable of working under explosion environment of explosive |
| JP6042061B2 (en) * | 2011-10-12 | 2016-12-14 | Ｊｆｅエンジニアリング株式会社 | Spray nozzle, fluid atomizer using the spray nozzle |
| CN107764981A (en) * | 2017-09-29 | 2018-03-06 | 西南石油大学 | A kind of profit annular flow generation and liquid holdup measurement visualization device and method |
| CN110029055B (en) * | 2019-04-17 | 2020-02-07 | 中粮集团有限公司 | Liquid supplementing device, starch jet cooking equipment, starch liquefying device and high-concentration starch milk jet cooking liquefying method |
-
2019
- 2019-11-04 CN CN201911065739.XA patent/CN112763684B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112763684A (en) | 2021-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103244833B (en) | Method and system for gas pipeline leakage detection and positioning | |
| AU2009290420B2 (en) | Method and device for detecting leaks in an underground liquid pipe, particularly a water pipe | |
| CN201654940U (en) | Aspiration gas detecting system | |
| CN112763684B (en) | Mixing device for wet natural gas detection and wet natural gas detection system | |
| CN101237916A (en) | Integrated containment system | |
| CN106894810A (en) | The monitoring device and method of hydrate deposition rule during the test of deep water gas well | |
| CN104596807A (en) | Sampling measuring device and sampling measuring method of radioactive aerosol | |
| CA2028148C (en) | Optical probe for fluid light transmission properties | |
| EP2820655B1 (en) | Method and device for controlling the dynamic confinement of an enclosure | |
| CN112763683B (en) | Mixing device for wet natural gas detection and wet natural gas detection system | |
| CN114324108A (en) | Internally-inserted pipeline gas permeation detection device and operation method | |
| CN110296324A (en) | A kind of the gas pipe leakage monitoring method and device of adjustable monitoring distance | |
| CN101105441B (en) | Fluid flowing device and optical measurement equipment using such a device | |
| CN205120530U (en) | Infusibility particle detector | |
| SA08290658B1 (en) | Gas Leak Detector, and a Method and Devices for Gas Leak Detecting | |
| CN112763682B (en) | Wet natural gas detection method | |
| CN105823754A (en) | Gas detection method and apparatus | |
| CN105403290A (en) | Natural gas circular flow standard test system | |
| CN109268691A (en) | System for automatically prejudging leakage of volatile chemical medium pipeline | |
| CN105628108B (en) | The device and method of biphase gas and liquid flow flow in a kind of measurement vertical pipeline | |
| CN112304558B (en) | Test system for testing natural gas flow field | |
| WO2023060769A1 (en) | Blockage and leakage detection structure, and blockage and leakage detection method | |
| CN105486549B (en) | A kind of sampling system that can realize constant flow isokinetic sampling | |
| CN112304560B (en) | Test cabin for testing natural gas flow field | |
| CN104458588B (en) | Bidirectional self-cleaning type optical fiber gas sensor probe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |