CN112763684A - 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
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Abstract
The invention discloses a mixing device for detecting wet natural gas and a detection system for the wet natural gas, 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 communicated with the natural gas pipeline; the outer layer pipe is sleeved on the inner layer pipe, an annular space is arranged between the inner layer pipe and the outer layer pipe, a liquid injection port is formed in the side wall of the outer layer pipe, one end of the outer layer pipe is connected with the side wall of the inner layer pipe in a sealing mode, and the air outlet end is located inside the outer layer pipe. The invention can quickly form wet natural gas with annular flow in the flowing state, and is beneficial to improving the accuracy of the detection result.
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 higher and higher. During natural gas production, the gas obtained from the wellhead is usually wet natural gas containing liquids (e.g. water, hydrocarbon liquids). In order to improve the mining quality, the flow rate of the wet natural gas needs to be accurately detected.
The existing wet natural gas detection device adopts air and water as a test medium, when mixed gas for testing is prepared, the air and the water are simultaneously injected into the same container to be fully mixed, and the mixed gas is introduced into the wet natural gas detection device for detection.
However, the flow characteristic of wet natural gas is that gas dominates, gas pushes liquid to flow, the flow form is that gas is in the center of a pipeline, liquid flows in a ring shape around the pipe wall, and the difference between the flow state of mixed gas prepared by injecting air and water into the same container at the same time and the flow state of the ring flow is large, which easily causes deviation of the detection result and poor accuracy.
Disclosure of Invention
The embodiment of the invention provides a mixing device for detecting wet natural gas and a wet natural gas detection system, which can quickly form wet natural gas with annular flow in a flowing 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, where the mixing device includes: the inner-layer pipe is provided with an air inlet end and an air outlet end, and the air inlet end is communicated with the natural gas pipeline; the outer layer pipe is sleeved on the inner layer pipe, an annular space is arranged between the inner layer pipe and the outer layer pipe, a liquid injection port is formed in the side wall of the outer layer pipe, one end of the outer layer pipe is connected with the side wall of the inner layer pipe in a sealing mode, and the air outlet end is located inside the outer layer pipe.
In an implementation manner of the embodiment of the present invention, the outer pipe includes a first pipe section and a second pipe section that are communicated with each other, one end of the first pipe section is hermetically connected to a side wall of the inner pipe, a pipe diameter of the first pipe section is larger than a pipe diameter of the second pipe section, and the liquid injection port is located in the first pipe section.
In another implementation manner of the embodiment of the present invention, a first flange is provided on an outer side wall of the inner pipe, a second flange is provided at one end of the outer pipe, and the first flange and the second flange are connected in a sealing manner.
In another implementation manner of the embodiment of the present invention, the inner 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 provided at an end of the fourth pipe section opposite to the third pipe section, an end surface of the outer flange abuts against the first flange, and another end surface of the outer flange abuts against the second flange.
In another implementation manner of the embodiment of the present invention, the mixing apparatus further includes: the device comprises a first measuring unit and a second measuring unit, wherein the first measuring unit is used for measuring the flow of natural gas flowing into the inner layer pipe, the second measuring unit is used for measuring the flow of liquid flowing into the outer layer pipe, 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 apparatus further includes: the device comprises a first adjusting unit and a second adjusting unit, wherein the first adjusting unit is used for adjusting the flow and/or pressure of natural gas flowing into the inner layer pipe, the second adjusting unit is used for adjusting the flow and/or pressure of liquid flowing into the outer layer pipe, the first adjusting unit is positioned on a pipeline communicated with the air inlet end of the inner layer pipe, and the second adjusting unit is positioned on a pipeline communicated with the liquid injection port.
In another aspect, an embodiment of the present invention provides a wet natural gas detection system for detecting wet natural gas prepared by a mixing device as described above, including: mixing arrangement, test chamber and test tube way, the test tube way with the other end intercommunication of mixing arrangement's outer layer pipe, transparent window has on the lateral wall of test chamber, the test tube way includes first pipe wall and second pipe wall, first pipe wall with two lines of demarcation edges of second pipe wall the axial extension of test tube way, first pipe wall is transparent lateral wall, the second pipe wall is non-transparent lateral wall, first pipe wall with transparent window is relative.
In another implementation manner of the embodiment of the present invention, a central angle corresponding to the arc where the first tube wall is located is 180 ° to 240 °, or a central angle corresponding to the arc where the first tube wall is located is 15 ° to 60 °.
In another implementation manner of the embodiment of the present invention, the transparent window is arc-shaped, a central angle corresponding to an arc where the transparent window is located is not smaller than a central angle corresponding to an arc where the first tube wall is located,
or, the transparent window comprises a first window plate and a second window plate which are connected by side edges, the distance between the opposite side edge of the side edge connected with the second window plate on the first window plate and the second window plate is not less than the diameter of the test pipeline, and the distance between the opposite side edge of the side edge connected with the first window plate on the second window plate and the first window plate is not less than the diameter of the test pipeline.
In another implementation of the embodiment of the invention, the detection system further comprises a separation unit for separating liquids of the wet natural gas, the separation unit being located on a pipeline communicating with the test pipeline.
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, a liquid injection port is formed in the side wall of the outer layer pipe, when the detection system is used, natural gas in the natural gas pipeline enters the inner layer pipe, liquid can enter the annular space between the inner layer pipe and the outer layer pipe through the liquid injection port, and the gas outlet end of the inner layer pipe is located inside the outer layer pipe, so that the natural gas in the inner layer pipe and the liquid in the outer layer pipe can be mixed at the gas outlet end of the inner layer pipe, wet natural gas flowing in an annular flow state is formed, and the accuracy of a detection result is improved.
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 in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
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 structural 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 chamber and test tube provided by an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a test tube according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a test tube according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a test chamber according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in 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 natural gas pipeline comprises an inner-layer pipe 1 and an outer-layer pipe 2 sleeved on the inner-layer pipe 1, wherein the inner-layer pipe 1 is provided with a gas inlet end 1a and a gas outlet end 1b, and the gas inlet end 1a is communicated with a natural gas pipeline; an annular space 10 is arranged between the inner layer pipe 1 and the outer layer pipe 2, a liquid filling port 20 is arranged on the side wall of the outer layer pipe 2, one end of the outer layer pipe 2 is hermetically connected with the side wall of the inner layer pipe 1, and the air outlet end 1b is positioned inside the outer layer pipe 2.
The inner layer tube 1 is located inside the outer layer tube 2, that is, the other end of the outer layer tube 2 protrudes out of the inner layer tube 1 along the axial direction of the outer layer tube 2, that is, the outer layer tube 2 covers the air outlet end 2 inside.
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, a liquid injection port is formed in the side wall of the outer layer pipe, when the detection system is used, natural gas in the natural gas pipeline enters the inner layer pipe, liquid can enter the annular space between the inner layer pipe and the outer layer pipe through the liquid injection port, and the gas outlet end of the inner layer pipe is located inside the outer layer pipe, so that the natural gas in the inner layer pipe and the liquid in the outer layer pipe can be mixed at the gas outlet end of the inner layer pipe, wet natural gas flowing in an annular flow state is formed, and the accuracy of a detection result is improved.
As shown in FIG. 2, the outer pipe 2 comprises a first pipe section 21 and a second pipe section 22 which are communicated, one end of the first pipe section 21 is hermetically connected with the side wall of the inner pipe 1, the pipe diameter of the first pipe section 21 is larger than that of the second pipe section 22, and the liquid injection port 20 is positioned in the first pipe section 21. In this embodiment, a first transition pipe section 24 is provided at the joint of the first pipe section 21 and the second pipe section 22, the first transition pipe section 24 is a pipe with a gradually changing pipe diameter, and the pipe diameter gradually decreases from the end of the first transition pipe section 24 connected with the first pipe section 21 to the end of the first transition pipe section 24 connected with the second pipe section 22. This allows more liquid to be buffered in the first section 21 and then through the first transition section 24 into the second section 22, allowing the liquid in the outer tube 2 to flow steadily.
Illustratively, the pipe diameter of the first pipe section 21 may range from 100mm to 140mm, for example, the pipe diameter of the first pipe section 21 may be 130 ± 5 mm. The angle between the generatrix of the first transition duct section 24 and the axis may range from 30 ° to 50 °, for example, the angle between the generatrix of the first transition duct section 24 and the axis may be 40 ± 2 °. The pipe diameter of the second pipe section 22 may range from 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 no less than 330mm, so that the liquid has a sufficient buffer distance before entering the inner pipe 1.
As shown in fig. 3, the inner pipe 1 has a first flange 11 on a sidewall thereof, the outer pipe 2 has a second flange 23 at one end thereof, and the first flange 11 and the second flange 23 are sealingly coupled. 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 liquid in the outer layer pipe 2 can be prevented from flowing out of the outer layer pipe 2 from one end of the outer layer pipe 2 through the sealing connection of the first flange 11 and the second flange 23.
As shown in fig. 4, the inner-layer pipe 1 includes a third pipe segment 12 and a fourth pipe segment 13, the first flange 11 is located at an end of the third pipe segment 12 opposite to the fourth pipe segment 13, an outer flange 14 is provided at an end of the fourth pipe segment 13 opposite to the third pipe segment 12, an outer diameter of the outer flange 14 is not smaller than an inner diameter of the outer-layer pipe 2, and the outer flange 14 is located between the first flange 11 and the second flange 23, so that one end surface of the outer flange 14 abuts against the first flange 11, and the other end surface of the outer flange 14 abuts against the second flange 23. In this embodiment, the inner pipe 1 adopts two-section structure of third pipeline section 12 and fourth pipeline section 13, wherein, the fourth pipeline section 13 is located outside outer pipe 2, the third pipeline section 12 is located outside outer pipe 2, be equipped with outward flange 14 on the fourth pipeline section 13, first flange 11 and second flange 23 can pass through bolt fixed connection, outward flange 14 can fix the fourth pipeline section 13 in outer pipe 2 under the centre gripping of first flange 11 and second flange 23, and set up outward flange 14 and can also improve the leakproofness between first flange 11 and the second flange 23. Simultaneously, the axial limiting is carried out through the first flange 11 and the second flange 23, so that the inner-layer pipe 1 can be conveniently and quickly disassembled.
Optionally, one end of the fourth pipe section 13 having the outer flange 14 has a second transition pipe section 15, the pipe diameter of the second transition pipe section 15 from the end connected to the outer flange 14 to the other end of the second transition pipe section 15 gradually decreases, and natural gas can smoothly flow from the third pipe section 12 into the fourth pipe section 13 by the buffering effect 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 of the third transition pipe section 16 from the end close to the outer flange 14 to the other end of the third transition pipe section 16 is gradually increased, and natural gas can smoothly flow into the outer pipe 2 from the inner pipe 1 through the buffer action of the third transition pipe section 16, so that liquid and natural gas can be fully mixed.
Illustratively, the length of the third pipe section 12 may range from 100mm to 140mm, for example, the length of the third pipe section 12 may be 115 ± 5mm, the pipe diameter of the third pipe section 12 may range from 75mm to 90mm, for example, the pipe diameter of the third pipe section 12 may be 78 ± 2 mm. The generatrix of the second transition duct section 15 may be angled at an angle of 12 ° to 16 ° to the axis, for example, the generatrix of the second transition duct section 15 may be angled at an angle of 13.5 ± 0.5 ° to the axis. The length of the fourth pipe section 13 may range 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 ± 1 mm. The generatrix of the third transition duct section 16 may be angled at 8 ° to 12 ° to the axis, for example, the generatrix of the second transition duct section 15 may be angled at 9.5 ± 0.5 ° to the axis.
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 pipeline 4 communicated with the other end of the outer pipe 2 of the mixing device a, and the detection pipeline 4 is used for conveying the mixed wet natural gas into a test pipeline 5 for detection. Wherein, mixing arrangement A still includes: a first measuring unit 31 for measuring the flow rate of the natural gas flowing into the inner pipe 1 and a second measuring unit 32 for measuring the flow rate of the liquid flowing into the outer pipe 2, the first measuring unit 31 being located on a pipe line communicating with the air inlet end 1a of the inner pipe 1, the second measuring unit 32 being located on a pipe line communicating with the liquid pouring port 20. The first measuring unit is arranged on the pipeline communicated with the inner layer pipe 1 to measure the flow of the natural gas flowing into the inner layer pipe 1, and the second measuring unit 32 is arranged on the pipeline communicated with the liquid injection port 20 to measure the flow of the liquid flowing into the outer layer pipe 2, so that the mixing ratio of the natural gas and the liquid can be controlled, and the wet natural gas with various different ratios can be detected. And after the required wet natural gas is formed, the wet natural gas can enter the detection pipeline to be detected.
Illustratively, the first measurement unit 31 and the second measurement unit 32 may be flow meters, by which the flow rate of the natural gas entering the inner pipe 1 and the flow rate of the liquid entering the outer pipe 2 may be determined, so as to accurately control the liquid content of the wet natural gas for detection, to achieve detection of wet natural gas of a plurality of different liquid content 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 adjusting unit 71 for adjusting the flow rate and/or pressure of the natural gas flowing into the inner pipe 1 and a second adjusting unit 72 for adjusting the flow rate and/or pressure of the liquid flowing into the outer pipe 2, the first adjusting unit 71 being located on a pipeline communicating with the gas inlet end 1a of the inner pipe 1, the second adjusting unit 72 being located on a pipeline communicating with the liquid injection port 20. The first adjusting unit 71 is provided to adjust the flow rate 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 rate and pressure. The second regulating unit 72 is provided to regulate the flow rate and/or pressure of the liquid into the outer tube 2 so that the liquid into the outer tube 2 has a stable flow rate and/or pressure.
For example, the first adjusting unit 71 may be adjusted by a pressure adjusting valve and a flow rate adjusting valve, which include a plurality of pressure adjusting valves and flow rate adjusting valves with different adjusting capacities connected in parallel, to control the pressure and flow rate of the natural gas transported from the natural gas pipeline, an inlet of the first adjusting unit 71 may be communicated with the natural gas pipeline, and an outlet of the first adjusting unit 71 may be communicated with the first measuring unit 31 through a pipeline.
In this embodiment, the mixing device a may further include a liquid storage unit, the liquid storage unit is communicated with the second measurement unit 32 through a pipeline, the second adjusting unit 72 is located on a pipeline between the liquid storage unit and the second measurement unit 32, and the second adjusting unit 72 may adjust a flow rate and/or a pressure of the liquid, so that the adjusted liquid has a stable pressure and/or flow rate.
Embodiments of the present invention provide a wet natural gas detection system, as shown in fig. 5, 6 and 7, for detecting wet natural gas prepared by the mixing device as described above. The detection system comprises: mixing arrangement A, test chamber 6 and test pipeline 5, have transparent window 60 on the lateral wall of test chamber 6, test pipeline 5 includes first pipe wall 51 and second pipe wall 52, and two demarcation lines of first pipe wall 51 and second pipe wall 52 extend along the axial of test pipeline 5, and first pipe wall 51 is the transparent lateral wall, and second pipe wall 52 is non-transparent lateral wall, and first pipe wall 51 is relative with transparent window 60.
Wherein, the outer layer pipe 2 can be communicated with the test pipeline 5 through the detection pipeline 4. A plurality of kinds of test equipment for detecting the wet natural gas are arranged in the detection pipeline 4. The device can be used for measuring the flow rate, the section liquid content, the manifold and other various detections of the wet natural gas through the testing equipment. The test device may be, for example, a flow meter, by means of which a measurement of the flow rate of the wet natural gas can be achieved.
The test pipeline of the embodiment is connected with the detection pipeline, so that the wet natural gas mixed by the mixing device can enter the test pipeline to detect the wet natural gas. 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 speedometer and laser doppler speedometer promptly, can shine to test pipeline inside through first pipe wall, light test pipeline inside to make particle imaging speedometer and laser doppler speedometer 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 pipeline communicating with the test pipeline 5. In this embodiment, the separation unit 8 can separate the tested wet natural gas into natural gas and liquid, and recycle the natural gas and the liquid. The liquid separated by the separation unit 8 can be fully or partially returned to the liquid storage unit so as to be recycled.
Optionally, the detection system further includes a third adjusting unit 73, wherein the third adjusting unit 73 may include a plurality of pressure adjusting valves and flow pressure adjusting valves connected in parallel, so that the third adjusting unit 73 can adjust the flow and/or pressure of the natural gas separated by the separation unit 8 and deliver the natural gas to the natural gas pipeline, the gas source or the natural gas pipeline network.
In one implementation, the first tube wall 51 may have a circular arc corresponding to a central angle α of 180 ° to 240 °. The pipeline is particularly suitable for a particle imaging speed measurement method, and when the particle imaging speed measurement method is used for testing, a certain amount of tracer particles moving along with a fluid need to be injected into the fluid, laser is adopted to illuminate a test surface in a flow field, and in order to meet the requirement that the particle imaging speed measurement method can shoot a test surface in a natural gas pipeline, a central angle alpha corresponding to an arc where a first pipe wall 51 is located needs to be large enough, and the central angle alpha is set to be at least 180 degrees, so that the test surface shot by the particle imaging speed measurement method can relate to the maximum axial cross section of a test pipeline 5, and the obtained flow field information of the natural gas pipeline is more comprehensive. And in order to prevent ambient light from shining test tube 5 in, still set up central angle alpha and be not more than 240 thereby make the ambient light who is located the first pipe wall 51 back can not shine test tube 5 in to avoid causing the interference to the test surface of shooing, in order to improve the degree of accuracy of test.
For example, as shown in fig. 8, the circular arc of the first tube wall 51 may have a central angle α of 210 °. The central angle can effectively reduce the influence of ambient light on the premise of ensuring the satisfaction of a particle imaging speed measurement method. 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 the embodiment, the particle imaging speed measurement method is to enable the irradiated laser to illuminate the maximum axial cross section of the test pipeline 5 to be measured so as to obtain the flow field information of the comprehensive natural gas pipeline, that is, the laser can be radially irradiated, and the light path of the laser is ensured to be always in the area of the first pipe wall 51, so that an axially extending bright surface can be formed in the test pipeline 5, and the particle imaging speed measurement equipment can complete the shooting of the bright surface through the first side wall.
It should be noted that the pipeline can also meet the requirements of the laser doppler velocity measurement method, that is, the pipeline can be used for simultaneously performing the tests of the laser doppler velocity measurement method and the particle imaging velocity measurement method.
In another embodiment of the present invention, the first tube wall 51 is positioned on an arc having a central angle of 15 ° to 60 °. The pipeline is particularly suitable for a laser Doppler velocity measurement method, and because the laser Doppler velocity measurement method needs to emit two coherent light waves through an emission source to form a measurement area, the pipeline is suitable for the laser Doppler velocity measurement method, and only the central angle alpha corresponding to the arc where the first pipe wall 51 is located needs to be satisfied 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 less than 15 °, so that the laser emitted by the laser doppler velocity measurement method can enter the test pipe 5 through the first pipe wall 51, and the central angle α is not greater than 60 °, so as to prevent the ambient light from irradiating the test pipe 5, and avoid the ambient light from interfering with the laser doppler velocity measurement to the greatest extent, so as to improve the accuracy of the test.
Illustratively, as shown in FIG. 9, the first tube wall 51 is positioned on an arc having a central angle of 60. The first pipe wall 51 enables a detection signal emitted by the laser doppler velocity measurement device, such as laser, to enter the test pipeline 5 filled with 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 velocity measurement device again through the first pipe wall 51, so that the test of the laser doppler velocity measurement method is realized. And the uncertainty can be reduced to 2% by using the pipeline to carry out the test 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. The light transmittance of the first pipe wall 51 is larger than that of the second pipe wall 52, so that laser can be emitted into the pipeline from the first pipe wall 51 more, and ambient light is prevented from being emitted into the pipeline from the second pipe wall 52 during testing, the testing accuracy is improved, and interference is reduced.
It should be noted that when the flow field and the flow velocity of the pipeline 5 body are tested, a particle imaging speed measurement method is required to be used for testing, and in order to meet the requirement that a test surface can be shot in the natural gas pipeline by the particle imaging speed measurement method, that is, a pipeline with a central angle α of 180 ° to 240 ° corresponding to the arc where the first pipe wall 51 is located should be used as the pipeline. When the flow velocity of the pipeline 5 body needs to be accurately tested, a laser doppler test method needs to be used for testing, that is, a pipeline with a central angle of 15-60 degrees corresponding to the arc where the first pipe wall 51 is located should be used for the pipeline.
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 be an organic glass pipe, the light transmittance of the organic glass pipe may reach more than 80%, and meanwhile, a transmittance reducing layer for reducing the light transmittance may be disposed on the inner wall or the outer wall of the second pipe wall 52. For example, the permeability reducing layer may be a frosted layer or a non-transparent film layer, coating. Illustratively, the thickness of the non-transparent film layer, coating or frosting may be no greater than 1mm, such as 0.8 ± 0.1 mm. This can reduce the ambient light that incides from second pipe wall 52 to prevent that ambient light and dust etc. outside second pipe wall 52 from causing the influence to the test, reduce the laser that reflects simultaneously, and the laser that reflects can cause the interference to signal acquisition for example shoot, consequently can improve test accuracy and precision.
In other embodiments, the light transmittance of the first tube wall 51 can be equal to the light transmittance of the second tube wall 52. The test pipe 5 is a transparent pipe and can be made of organic glass, and although there is a part of ambient light incident into the test pipe 5 from the second pipe wall 52 to affect the test, the transparent pipe can be used for testing the particle imaging speed measurement method and the laser doppler speed measurement method.
In this embodiment, when the particle imaging speed measurement device and the laser doppler speed measurement device are used for testing, the pressure of the natural gas in the test pipeline 5 is higher as 6MPa, the compressive strength of the test pipeline 5 can be determined according to the test requirements, and the pressure requirement can be met by adjusting the material, thickness and pipe diameter of the test pipeline 5.
When the wet natural gas is tested by adopting laser Doppler speed measuring equipment and particle imaging speed measuring equipment, the length of the test pipeline 5 can be processed according to the test requirement. For example, the test tube 5 may have a length of 0.5m, 1m or 1.5 m.
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 pipeline 5 can be accommodated in the recess of the test chamber 6, meanwhile, the transparent window 60 faces 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, and the first pipe wall 51 can be completely observed through the transparent window 60.
In an implementation manner of this embodiment, the transparent window 60 may be arc-shaped, and a central angle corresponding to an arc where the transparent window 60 is located is not smaller than a central angle corresponding to an arc where the first tube wall 51 is located. The arc corresponding to the arc-shaped transparent window 60 may be concentric with the arc of the first tube wall 51, even if the transparent window 60 covers the first tube wall 51, so that the first tube wall 51 can be completely observed through the transparent window 60.
In another implementation of this embodiment, the transparent window 60 may include a first window plate 61 and a second window plate 62 connected at their sides, wherein the distance from the side opposite to the side connected to the second window plate 62 on the first window plate 61 to the second window plate 62 is not less than the diameter of the test pipe 5, and the distance from the side opposite to the side connected to the first window plate 61 on the second window plate 62 to the first window plate 61 is not less than the diameter of the test pipe 5. Illustratively, the first viewing panel 61 is perpendicular to the second viewing panel 62, the distance from the side of the first viewing panel 61 opposite to the side connected to the second viewing panel 62 is not less than the diameter of the test conduit 5, and the distance from the side of the second viewing panel 62 opposite to the side connected to the first viewing panel 61 is not less than the diameter of the test conduit 5, so that the test conduit 5 is wrapped 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 can be determined according to the position of the intersection point of the emitted laser in the laser doppler test and the focal length of the camera in the particle imaging test, so as to ensure the accuracy of the test.
Optionally, the inspection system may further comprise an enclosure isolating the gap between the test tube 5 and the transparent window 60 from the outside. For example, the sealing part can be shading cloth, a dustproof cloth curtain and the like, and the sealing part can be arranged to avoid the influence of dust, water vapor, light and the like in the external environment on the flow field and flow velocity test, so that the influence of external environment factors on the measurement can be reduced, and the test accuracy is improved.
Alternatively, the transparent window 60 may have good light transmittance, for example, the transmittance of the transparent window 60 may be 90%. Like this, the particle formation of image speedometer, the laser of laser Doppler speedometer transmission can get into test tube 5 in through transparent window 60 when the test in, good light transmissivity can simultaneously, when particle formation of image speedometer, laser Doppler speedometer test, can reduce transparent window 60's reflection and refraction, avoid causing the influence to the test, improve the degree of accuracy.
Alternatively, as shown in fig. 10, the test chamber 6 may include: the air conditioner comprises a sealing unit, a ventilation unit and a 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 and a second isolation door 64, the first isolation door 63 is installed on one side wall of the test chamber 6, the second isolation door 64 is located inside the test chamber 6, the second isolation door 64 isolates the internal space of the test chamber 6 into a test space 65 and a buffer space 66, and the first isolation door 63 communicates with the buffer space 66. The ventilation unit comprises an air conveying device 91 and a pipeline communicated with a safe air source, an air inlet of the air conveying device 91 is communicated with the pipeline, and an air outlet of the air conveying device 91 is communicated with the test space 65.
The test chamber is a closed chamber body, so that the tightness of the test space is ensured to a certain extent, and the side wall of the test chamber is provided with a transparent window, so that the particle imaging test equipment and the laser Doppler test equipment which are positioned in the test chamber can detect a test pipeline through the test chamber, and the visual function of the test chamber is realized. And sealed unit includes first insulated door and second insulated door, the second insulated door is located inside the test chamber, the second insulated door keeps apart into test space and buffer space with the inner space of test chamber, first insulated door and buffer space intercommunication, when the staff passes in and out the test chamber, make outside air can advance into buffer space, therefore make outside air can not get into test space easily, thereby prevent that the combustible gas who exists from sneaking into test space in the outside air, improve the security of test chamber. Meanwhile, the ventilation unit is used for introducing safe air into the test space, so that air in the external environment of the test chamber can be effectively prevented from entering the test space, and the safety of the test chamber is enhanced.
Optionally, the ventilation unit further comprises a pressure regulating device 92, the pressure regulating device 92 being located within the test space 65, the pressure regulating device 92 being configured to regulate the pressure within the test space 65 such that the pressure within 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 inside the test chamber and is capable of keeping the air pressure in the test space 65 of the test chamber at a preset pressure value above the air pressure in the outside environment. For example, the pressure regulating device 92 may include an air compressor, a pressure detector and a controller, the pressure detector is configured to detect air pressures inside and outside the test chamber, and after the controller obtains the air pressures inside and outside the test chamber, the controller controls the air compressor to operate according to a pressure difference between the air pressures inside and outside the test chamber, so as to regulate the air pressure inside the test chamber until the pressure difference between the air pressures inside and outside the test chamber reaches a preset pressure value. For example, the preset pressure value may be 50 Pa. Because the air pressure in the test space 65 is higher than the air pressure of the external environment, the 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 operation of the test equipment, 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 within the test space 65, the air conditioning device 93 being for conditioning the temperature and humidity within the test space. The air conditioning device can be an explosion-proof air conditioner arranged in the test chamber, and the explosion-proof air conditioner can keep the temperature and the humidity in the test chamber stable. For example, the relative humidity in the test chamber can be kept at 30% to 50% in consideration of the operation requirements of particle imaging velocimetry equipment and laser doppler velocimetry equipment. The temperature in the test chamber may be maintained at 20 ℃ to 26 ℃ for reasons of working environment comfort.
Optionally, the test chamber further comprises a sliding unit for controlling the axial movement of the test chamber along the test conduit. The test cabin can be flexibly moved through the sliding unit, and particle imaging speed measurement and laser Doppler speed measurement can be more flexible and accurate.
In this embodiment, the sliding unit includes: the test chamber comprises a sliding rail, a pulley capable of sliding along the sliding rail and a pulley seat, wherein the pulley seat is located at the bottom of the test chamber, the pulley is rotatably installed on the pulley seat, and the extending direction of the sliding rail is the same as the axial direction of a pipeline to be tested. After the test cabin is moved to the preset position through the sliding unit, the pulley can be fixed on the sliding rail through the locking mechanism, and therefore relevant tests and observation can be conducted.
Optionally, a gas detector and an alarm device for detecting the concentration of gas components are arranged in the test space, the alarm device is electrically connected with the gas detector, and the alarm device is used for sending an alarm signal according to the detection result of the gas detector. The gas detector can detect gas concentration, smoke and low pressure, and the alarm device obtains a detection result and judges whether to alarm or not according to the detection result. Wherein, the gas detection appearance can detect at least one of oxygen concentration, methane concentration, carbon dioxide concentration, smog and the low pressure in the test chamber, and alarm device can send alarm signal according to the testing result, can ensure the safety of staff and equipment effectively. The alarm device can comprise audible and visual alarms, and the audible and visual alarms can be respectively arranged inside and outside the test chamber to warn under dangerous conditions.
The wet natural gas detection system provided by the invention can realize the mixing of natural gas and liquid phases and the generation of a flow pattern in a short pipeline distance, can accelerate the production of wet natural gas annular flow, reduce the pressure loss in the gas-liquid mixing process and provide 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, and whether the detected wet natural gas is in the stable flowing state or not can be conveniently known, and the test accuracy can be improved; the invention can visually observe the flowing condition of the wet natural gas in the pipeline and realize visual test.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A mixing device for wet natural gas detection, the mixing device comprising:
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 communicated with a natural gas pipeline;
the suit is in outer pipe (2) on inlayer pipe (1), inlayer pipe (1) with annular space (10) have between outer pipe (2), liquid mouth (20) have on the lateral wall of outer pipe (2), the one end of outer pipe (2) with the lateral wall sealing connection of inlayer pipe (1), it is located to give vent to anger end (1b) inside outer pipe (2).
2. The mixing device for the wet natural gas detection according to claim 1, wherein the outer pipe (2) comprises a first pipe section (21) and a second pipe section (22) which are communicated with each other, one end of the first pipe section (21) is connected with the side wall of the inner pipe (1) in a sealing mode, the pipe diameter of the first pipe section (21) is larger than that of the second pipe section (22), and the liquid injection port (20) is located in the first pipe section (21).
3. The mixing device for the detection of wet natural gas according to claim 1, wherein the inner pipe (1) has a first flange (11) on the outer side wall thereof, the outer pipe (2) has a second flange (23) at one end thereof, and the first flange (11) and the second flange (23) are hermetically connected.
4. The mixing device for wet natural gas detection according to claim 3, wherein the inner pipe (1) comprises a third pipe section (12) and a fourth pipe section (13), the first flange (11) is located at the end of the third pipe section (12) opposite to the fourth pipe section (13), the end of the fourth pipe section (13) opposite to the third pipe section (12) is provided with an outer flange (14), one end face of the outer flange (14) is abutted against the first flange (11), and the other end face of the outer flange (14) is abutted against the second flange (23).
5. The mixing device for wet natural gas detection according to any one of claims 1 to 4, further comprising: the device comprises a first measuring unit (31) used for measuring the flow of natural gas flowing into the inner layer pipe (1) and a second measuring unit (32) used for measuring the flow of liquid flowing into the outer layer pipe (2), wherein the first measuring unit (31) is positioned on a pipeline communicated with the air inlet end (1a) of the inner layer pipe (1), and the second measuring unit (32) is positioned on a pipeline communicated with the liquid injection port (20).
6. The mixing device for wet natural gas detection according to any one of claims 1 to 4, further comprising: the natural gas pressure regulating device comprises a first regulating unit (71) used for regulating the flow and/or pressure of natural gas flowing into the inner layer pipe (1) and a second regulating unit (72) used for regulating the flow and/or pressure of liquid flowing into the outer layer pipe (2), wherein the first regulating unit (71) is positioned on a pipeline communicated with the gas inlet end (1a) of the inner layer pipe (1), and the second regulating unit (72) is positioned on a pipeline communicated with the liquid injection port (20).
7. A wet natural gas detection system for detecting wet natural gas produced by the mixing device according to any one of claims 1 to 6, comprising: mixing arrangement (A), test chamber (6) and test tube way (5), test tube way (5) with the other end intercommunication of outer layer pipe (2) of mixing arrangement (A), transparent window (60) have on the lateral wall of test chamber (6), test tube way (5) are including first pipe wall (51) and second pipe wall (52), first pipe wall (51) with two dividing lines of second pipe wall (52) are followed the axial extension of test tube way (5), first pipe wall (51) are transparent lateral wall, second pipe wall (52) are non-transparent lateral wall, first pipe wall (51) with transparent window (60) are relative.
8. The wet natural gas detection system according to claim 7, wherein the first tube wall (51) is located at a central angle of 180 ° to 240 ° with respect to the arc, or wherein the first tube wall (51) is located at a central angle of 15 ° to 60 ° with respect to the arc.
9. The wet natural gas detection system according to claim 7, wherein the transparent window (60) is arc-shaped, a central angle corresponding to an arc in which the transparent window (60) is located is not smaller than a central angle corresponding to an arc in which the first tube wall (51) is located,
or, the transparent window (60) comprises a first window plate (61) and a second window plate (62) which are connected with each other at the side edges, the distance between the side edge opposite to the side edge connected with the second window plate (62) on the first window plate (61) and the second window plate (62) is not less than the diameter of the test pipeline (5), and the distance between the side edge opposite to the side edge connected with the first window plate (61) on the second window plate (62) and the first window plate (61) is not less than the diameter of the test pipeline (5).
10. The wet natural gas detection system according to any one of claims 7 to 9, further comprising a separation unit (8) for separating liquid of wet natural gas, the separation unit (8) being located on a pipeline communicating with the test pipeline (5).
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| WO2023231069A1 (en) * | 2022-06-01 | 2023-12-07 | 天津大学滨海工业研究院有限公司 | Boiler waste gas treatment equipment |
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