Gas pipeline testing device for on-line under-pressure particle size measurement

Abstract

The invention provides a gas pipeline testing device for on-line under-pressure particle size measurement, which comprises a main pipeline and a testing mechanism, and is characterized in that the main pipeline is provided with an aerial fog inlet and an aerial fog outlet and is used for conveying to-be-tested gas; the testing mechanism comprises a testing pipeline, a testing window part, a circular seam purging part and optical observation equipment, one end of the testing pipeline is vertically communicated with the main pipeline, the other end of the testing pipeline is connected with the testing window part, the circular seam purging part is arranged on the testing pipeline and used for providing purging airflow, and liquid drops of the main pipeline are effectively prevented from being attached to the testing window part; and the optical observation equipment performs under-pressure measurement on the particle size of the liquid drops in the main pipeline through the test window component. Through the synergistic effect of the test pipeline, the test window component, the circular seam purging component and the optical observation equipment, online under-pressure measurement of the particle size of the liquid drops of the main pipeline is realized. The device is especially suitable for on-line under-pressure measurement of particle sizes of liquid drops in pipelines under conditions of different media, flows and the like.

Description

Technical Field

[0001] The invention relates to the technical field of particle diameter optical testing, and in particular to a gas pipeline testing device for measuring particle diameter online under pressure. Background Art

[0002] The droplet size distribution in the tubular gas-liquid atomizer mixer affects the gas-liquid mass transfer performance. By measuring the internal droplet size online, it is convenient to adjust the working and operating parameters. During the operation of the natural gas pipeline network, there are also micron-level particles in the pipeline. Tiny particles or droplets not only reduce the quality of natural gas, but also pollute and wear core components such as compressors and gas turbines. If observation windows are opened directly on both sides of the pipeline and observations are made through the sealed glass observation windows, it is difficult to accurately measure the particle size online stably and for a long time because droplets and tiny particles are very easy to adhere to the test window lens. Therefore, how to achieve online pressure-stable measurement of droplet size in tubular atomizer mixers and natural gas pipelines is of great significance to the research and development of tubular atomizer mixers and the efficient and safe operation of natural gas transmission pipelines.

[0003] Commonly used online detection technologies for micron-level particles include high-speed photography, light pulsation, laser diffraction, etc. For example, application number ZL202210608042.8 discloses an experimental device and method for synchronously measuring the droplet size and instantaneous velocity distribution of spray far-field droplets. In fact, it is based on high-speed photography. After collecting images of spray far-field droplets, theoretical algorithms are used for analysis and calculation. However, since high-speed photography requires light source illumination, when the concentration is high or the pipeline is closed, the measurement becomes difficult due to the penetration performance of the light source.

[0004] Application No. ZL201610944064.6 discloses a device and method for measuring the particle size of coal powder in a pipeline. It uses laser illumination and CCD camera image recording technology, and proposes that protective gas should be provided to the optical window. By setting multiple blowing holes on the blowing pipe, the coal powder can be prevented from contaminating the optical window. However, setting multiple blowing holes can easily cause uneven purge flow field, which affects the flow of the main channel.

[0005] Application No. ZL200710042873.9 discloses a particle measurement method and device using a transmittance pulsation method, which uses a light pulsation method to measure particle transmittance pulsation and analyze the light signal pulsation caused by the measurement area. However, this method can only measure the average particle size of particles, but cannot quantitatively measure the particle size distribution of particles.

[0006] Application No. ZL201610651911.X discloses a sealed optical test window device resistant to explosion impact, which can meet the photography requirements under the conditions of explosion impact load. However, the use of two flanges for sealing is not only complex in structure, but also difficult to disassemble and maintain in time when the window glass is contaminated.

[0007] In summary, in view of the above-mentioned problems such as the difficulty of online pressure testing of pipeline particulate matter and the susceptibility of window glass to contamination, it is necessary to design a gas pipeline testing device for online pressure measurement of particle size.

[0008] In view of this, the present invention is proposed. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a gas pipeline testing device for measuring particle size online under pressure. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] The present invention provides a gas pipeline testing device for online pressure-based particle size measurement, comprising a main pipeline and a testing mechanism, wherein the main pipeline has an aerosol inlet and an aerosol outlet for conveying the gas to be tested; the testing mechanism comprises a testing pipeline, a testing window component, an annular gap purge component and an optical observation device, one end of the testing pipeline is vertically connected to the main pipeline, and the other end is connected to the testing window component, the annular gap purge component is arranged on the testing pipeline, and is used to provide a purge gas flow to the testing pipeline; the optical observation device performs pressure-based measurement of the droplet particle size in the main pipeline through the testing window component.

[0012] Preferably, the number of the testing mechanisms is two groups, and they are arranged symmetrically with respect to the main pipeline.

[0013] Preferably, the test pipe extends into the main pipe, and the extended length is 2 mm to 5 mm.

[0014] Preferably, the annular gap purge component has an annular gap cavity, the cross-section of the annular gap cavity is L-shaped, including a large head cavity and a small head cavity, and a plurality of gas inlets are provided on the annular gap purge component and are connected with the large head cavity; the small head cavity is connected with the test pipeline; the gas inlet and the small head cavity are staggered on the large head cavity.

[0015] Preferably, the test window component comprises a mounting seat, a glass observation window and an end cover, the mounting seat is connected to the test pipe, the end cover is screwed to the outside of the mounting seat, and a mounting cavity is formed therebetween for mounting the glass observation window.

[0016] Preferably, the glass observation window is sealedly connected to the mounting seat and the end cover via a sealing member.

[0017] Preferably, a pressure relief valve and a pneumatic ball valve are sequentially arranged between the test window component and the annular gap purge component along a direction toward the main pipeline.

[0018] Preferably, the optical observation equipment comprises a spray laser particle size analyzer.

[0019] The preferred technical solution of the present invention can at least produce the following technical effects:

[0020] The present invention effectively solves the technical problems existing in the prior art that the online pressure test of particulate matter in the pipeline is difficult and the window glass is easily contaminated. The present invention provides a gas pipeline testing device for online pressure measurement of particle size, including a main pipeline and a testing mechanism. The main pipeline has an aerosol inlet and an aerosol outlet for conveying the gas to be tested; the testing mechanism includes a testing pipeline, a testing window component, an annular gap purge component and an optical observation device. One end of the testing pipeline is vertically connected to the main pipeline, and the other end is connected to the testing window component. The annular gap purge component is arranged on the testing pipeline to provide a purge gas flow, effectively avoiding the droplets of the main pipeline from adhering to the testing window component, reducing interference with the measurement of the particle size, so as to keep the testing window component clean and transparent. The optical observation device measures the droplet particle size in the main pipeline under pressure through the testing window component. Through the synergistic effect of the testing pipeline, the testing window component, the annular gap purge component and the optical observation device, the online pressure measurement of the droplet particle size in the main pipeline is realized. It is particularly suitable for online pressure measurement of droplet particle size in pipelines with different media, flow rates and other conditions. At the same time, it is also suitable for online measurement of solid particle size in pipelines where glass windows are easily contaminated, and has wide application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a gas pipeline testing device for measuring particle size online under pressure provided by the present invention;

[0023] Figure 2 It is a structural schematic diagram of the connection position between the test pipeline and the main pipeline of a gas pipeline testing device for online pressure particle size measurement provided by the present invention;

[0024] Figure 3 It is a structural schematic diagram of a test window component of a gas pipeline testing device for online pressure-based particle size measurement provided by the present invention;

[0025] Figure 4 It is a structural schematic diagram of an annular gap purge component of a gas pipeline testing device for online pressure-based particle size measurement provided by the present invention;

[0026] In the figure:

[0027] 1. Main pipeline; 11. Aerosol inlet; 12. Aerosol outlet;

[0028] 2. Test pipe; 21. Extension end;

[0029] 3. Test window component; 31. Mounting seat; 311. External thread section; 32. Glass observation window; 33. End cover; 331. Internal thread section; 34. Sealing ring;

[0030] 4. Annular gap purge component; 41. Gas inlet; 42. Large head cavity; 43. Small head cavity; 44. Connecting flow channel;

[0031] 5. Pressure relief valve;

[0032] 6. Pneumatic ball valve. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] like Figure 1-Figure 4 As shown, the present invention provides a gas pipeline testing device for online pressure-based particle size measurement, comprising a main pipeline 1 and a testing mechanism, the main pipeline 1 having an aerosol inlet 11 and an aerosol outlet 12 for conveying the gas to be tested; the testing mechanism comprising a testing pipeline 2, a testing window component 3, an annular gap purge component 4 and an optical observation device, one end of the testing pipeline 2 is vertically connected to the main pipeline 1, and the other end is connected to the testing window component 3, the annular gap purge component 4 is arranged on the testing pipeline 2, for providing a purge airflow; the optical observation device performs pressure-based measurement of the droplet particle size in the main pipeline 1 through the testing window component 3.

[0035] Furthermore, the aerosol inlet 11 and the aerosol outlet 12 are sealed and connected to the front-end equipment and the rear-end equipment respectively through flanges, which is convenient for assembly and disassembly.

[0036] Through the synergistic effect of the test pipe 2, the test window component 3, the annular gap purge component 4 and the optical observation equipment, the online pressure measurement of the droplet particle size of the main pipeline 1 is realized. Among them, the test pipe 2 is vertically connected to the main pipeline 1 as a measurement channel. The annular gap purge component 4 provides an annular purge airflow, which effectively prevents the droplets of the main pipeline 1 from adhering to the test window component 3, reduces the interference with the measurement of the particle size, and keeps the test window component 3 clean and transparent. The test window component 3 provides an observation window so that the optical observation equipment can measure the droplets in the main pipeline 1 through the test window component 3. The present invention is particularly suitable for online pressure measurement of droplet particle size in pipelines with different media, flow rates and other conditions, including tubular gas-liquid atomizing mixers, demisting gas-liquid separators or other gas pipelines. At the same time, it is also suitable for online measurement of solid particle size in pipelines where glass windows are easily contaminated, and has a wide range of application value.

[0037] As an optional implementation, Figure 1 As shown, there are two groups of test devices, which are arranged symmetrically with respect to the main pipeline 1 .

[0038] Furthermore, a cross-shaped connecting structure is formed between the test pipeline 2 and the main pipeline 1 .

[0039] As an optional implementation, Figure 2 As shown, the test pipe 2 extends into the main pipe 1, and its extension length is 2 mm to 5 mm.

[0040] This arrangement is to prevent the liquid film attached to the inner wall of the main pipe 1 from being directly brought into the test pipe 2, thereby affecting the particle size measurement result.

[0041] Furthermore, the curvature of the extended end 21 of the test pipe 2 is the same as the curvature of the main pipe 1 , that is, the end surface of the extended section is parallel to the inner wall surface of the main pipe 1 .

[0042] As an optional implementation, Figure 4 As shown, the annular gap purge component 4 has an annular gap cavity, the cross-section of the annular gap cavity is L-shaped, including a large head cavity 42 and a small head cavity 43, and a plurality of gas inlets 41 are provided on the annular gap purge component 4 and are connected with the large head cavity 42; the small head cavity 43 is connected with the test pipe 2; the gas inlet 41 and the small head cavity 43 are staggered on the large head cavity 42.

[0043] Furthermore, both ends of the annular gap purge component 4 are concentrically welded to the test pipe 2 and have a connecting flow channel 44 , and the small head cavity 43 is connected to the measuring channel of the test pipe 2 through the connecting flow channel 44 .

[0044] The number of the gas inlets 41 is preferably two, and they are symmetrically arranged on the annular gap purge component 4 and connected to the gas supply device to uniformly supply gas to the annular gap cavity.

[0045] When the gas enters the large-head cavity 42 from the gas inlet 41, since the inner diameter of the large-head cavity 42 is larger than the inner diameter of the small-head cavity 43, according to the Bernoulli principle, the gas is accelerated when it enters the small-head cavity 43 and is ejected to the connecting flow channel 44, so as to form a ring-shaped uniformly sprayed purge airflow in the measuring channel of the test pipe 2, which effectively prevents droplets from adhering to the test window component 3, reduces interference with the measurement of the particle size, and keeps the test window component 3 clean and transparent.

[0046] It should be noted that the air intake flow rate of the annular gap purge component 4 can be adjusted according to different working conditions such as pressure, medium, flow rate, etc., so as to be suitable for measuring the internal droplet particle size of tubular gas-liquid atomizing mixers, demisting gas-liquid separators, gas pipelines, etc.

[0047] In addition, due to the provision of the annular gap purge component 4, the test window component 3 has good anti-pollution capability and can also be applied to scenarios such as online measurement of the particle size of solid particles in a tube where the glass window is easily contaminated.

[0048] As an optional implementation, Figure 3 As shown, the test window component 3 includes a mounting seat 31, a glass observation window 32 and an end cover 33. The mounting seat 31 is connected to the test pipe 2, and the end cover 33 is screwed to the outside of the mounting seat 31, and a mounting cavity is formed between the two for installing the glass observation window 32.

[0049] Furthermore, an internal thread section 331 is provided on the inner wall of the end cap 33, and an external thread section 311 is provided on the outer wall of the mounting seat 31. The internal thread section 331 and the external thread section 311 are threadedly matched to form a mounting cavity for mounting the glass observation window 32, so that the glass observation window 32 can be easily disassembled, cleaned and assembled.

[0050] As an optional implementation, Figure 3 As shown, the glass observation window 32 is sealedly connected to the mounting seat 31 and the end cover 33 through a sealing member.

[0051] Furthermore, the glass observation window 32 is made of high-transmittance optical glass. The sealing member is a sealing ring 34 .

[0052] The two end surfaces of the glass observation window 32 are sealedly connected to the mounting seat 31 and the end cover 33 through sealing rings 34 respectively.

[0053] As an optional implementation, Figure 1 As shown, a pressure relief valve 5 and a pneumatic ball valve 6 are sequentially arranged between the test window component 3 and the annular gap purge component 4 along the direction toward the main pipeline 1 .

[0054] Furthermore, the pressure relief valve 5 is arranged on the measuring pipe, and can be manually driven or electrically driven, and the specific driving mode can be designed according to the use requirements. Except for replacing the test window component 3 or performing other maintenance operations, the pressure relief valve 5 is in a normally closed state.

[0055] The pneumatic ball valve 6 is welded on the measuring pipeline, and preferably an electrically driven pneumatic ball valve 6 is used to achieve remote control and automatic operation.

[0056] By controlling the switch states of the pneumatic ball valve 6 and the pressure relief valve 5 , the particle size of the droplets in the main pipeline 1 can be measured, the test window component 3 can be replaced, or other inspection and maintenance operations can be performed.

[0057] When it is necessary to measure the particle size of the liquid droplets in the main pipeline 1, the pneumatic ball valve 6 is kept open, the pressure relief valve 5 is kept closed, and at the same time, air is supplied to the annular gap purge component 4 so that it provides an annular purge airflow to the test pipeline 2. After the observation requirements are met, the particle size of the liquid droplets in the main pipeline 1 is measured under pressure through the glass observation window 32 using an optical observation device.

[0058] When no measurement is needed, the pneumatic ball valve 6 and the pressure relief valve 5 remain closed, thereby blocking the airflow between the test pipeline 2 and the main pipeline 1, and the gas in the main pipeline 1 flows normally.

[0059] When it is necessary to replace the glass observation window 32 or perform other inspection and maintenance operations, the pneumatic ball valve 6 remains in a closed state, and then the pressure relief valve 5 is opened to release the pressure before online replacement of the glass observation window 32 or inspection and maintenance operations are performed.

[0060] As an optional embodiment, the optical observation device includes a spray laser particle size analyzer.

[0061] It should be noted that the optical observation equipment of the present invention includes but is not limited to a spray laser particle size analyzer, and the corresponding optical observation equipment can be selected according to the use requirements.

[0062] When the main pipeline 1 operates normally and does not need to be measured, the pneumatic ball valve 6 is remotely controlled to close and the gas supply to the annular gap purge component 4 is stopped, and the gas inside the main pipeline 1 flows normally.

[0063] When it is necessary to measure the particle size of the main pipeline 1 online with pressure, the annular gap purge component 4 is remotely controlled to supply air, and the purge airflow is provided to the test pipeline 2, and the pneumatic ball valve 6 is controlled to open. Then, the droplets in the main pipeline 1 are observed through the glass observation window 32. After the observation requirements are met, the spray laser particle size analyzer is turned on to start the measurement. The test data is processed by computer software to determine the droplet size and particle volume fraction.

[0064] When it is necessary to replace the glass observation window 32 or perform other inspection and maintenance operations, the pneumatic ball valve 6 is remotely controlled to close and stop supplying gas to the annular gap purge component 4. Then the pressure relief valve 5 is opened to release the pressure. The glass observation window 32 can be replaced or maintained online without affecting the normal flow of gas in the main pipeline 1.

[0065] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0066] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "an example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0069] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A gas pipeline testing device for measuring particle size online under pressure, characterized in that: It comprises a main pipeline and a testing mechanism, wherein the main pipeline has an aerosol inlet and an aerosol outlet for conveying the gas to be tested; the testing mechanism comprises a testing pipeline, a testing window component, an annular gap purge component and an optical observation device, one end of the testing pipeline is vertically connected to the main pipeline, and the other end is connected to the testing window component; the annular gap purge component is arranged on the testing pipeline to provide a purge gas flow; the optical observation device performs pressure measurement on the droplet particle size in the main pipeline through the testing window component.

2. A gas pipeline testing device for measuring particle size online under pressure according to claim 1, characterized in that: The number of the testing mechanisms is two groups, and they are arranged symmetrically with respect to the main pipeline.

3. A gas pipeline testing device for measuring particle size online under pressure according to claim 2, characterized in that: The test pipe extends into the main pipe, and the extension length is 2 mm to 5 mm.

4. The gas pipeline testing device for measuring particle size online under pressure according to claim 2, characterized in that: The annular gap purge component has an annular gap cavity, the cross-section of the annular gap cavity is L-shaped, including a large head cavity and a small head cavity, and a plurality of gas inlets are provided on the annular gap purge component and are connected with the large head cavity; the small head cavity is connected with the test pipeline; the gas inlet and the small head cavity are staggered on the large head cavity.

5. The gas pipeline testing device for measuring particle size online under pressure according to claim 2, characterized in that: The test window component includes a mounting seat, a glass observation window and an end cover. The mounting seat is connected to the test pipe, and the end cover is screwed to the outside of the mounting seat, and a mounting cavity is formed between the two for mounting the glass observation window.

6. A gas pipeline testing device for measuring particle size online under pressure according to claim 5, characterized in that: The glass observation window is sealed and connected to the mounting seat and the end cover through a sealing member.

7. The gas pipeline testing device for measuring particle size online under pressure according to claim 5, characterized in that: A pressure relief valve and a pneumatic ball valve are sequentially arranged between the test window component and the annular gap purge component along a direction toward the main pipeline.

8. The gas pipeline testing device for measuring particle size online under pressure according to claim 2, characterized in that: The optical observation equipment includes a spray laser particle size analyzer.

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