A natural gas flow measuring device based on PIV / LDV technology

Abstract

The utility model relates to natural gas transportation and measurement technical field, concretely relates to a natural gas flow measuring device based on PIV / LDV technique, including pipeline and the natural gas flow measuring assembly of fixed installation in the pipe wall of pipeline outside and with the intercommunication of pipeline inner chamber, the both ends of pipeline are fixedly installed with flange plate, and four annular cavities are formed to the arc slot of being passed through and being set up on two flange plates, sliding block is slidably installed in eight arc slots, and the both ends of eight sliding blocks are respectively slidably clamped on the inner groove wall of corresponding arc slot, the flange plate of the utility model is no longer limited by fixed hole position, and the pitch circle diameter where bolt is by sliding sliding block can be continuously adjusted, the radial position of bolt can be continuously adjusted through the screw in sliding strip hole, so that a set of device can be adapted to a plurality of different standards, different specifications of pipeline flange, solve the problem of "one to one without remainder" rigid connection, significantly expand the application scene of equipment.

Description

Technical Field

[0001] This utility model relates to the field of natural gas transmission and metering technology, specifically to a natural gas flow measurement device based on PIV / LDV technology. Background Technology

[0002] As a clean energy source, natural gas requires high-precision flow measurement for its transportation and trade settlement. Flow measurement devices based on PIV / LDV technology can obtain instantaneous full flow field information of the pipe cross-section through non-contact optical measurement methods. They have significant advantages such as high accuracy, no pressure loss, and no moving parts, and have become an important tool for laboratory research and high-end industrial field flow calibration and diagnosis.

[0003] However, in the actual deployment of such devices, a long-standing and thorny problem for engineers exists: poor compatibility of connecting flanges. Traditional flanges are connected to butt flanges via circumferentially distributed bolt holes, the position (pitch circle diameter PCD) and diameter of which are fixed national or industry standards. This means: Extremely limited compatibility: An expensive PIV / LDV measuring device typically can only be connected to pipe flanges that meet the exact same standards (such as the same national standard GB, American standard ANSI, or German standard DIN, with identical nominal pressure PN and nominal diameter DN). If the on-site pipe flange standards are different, direct installation is not possible.

[0004] Extremely inconvenient to use: If the device needs to be used on pipes of different specifications, complex adapter flange assemblies must be customized or the pipe itself must be modified. This not only increases the additional cost and construction time, but also introduces more potential leakage points, damages the integrity of the original pipeline system, and is cumbersome to construct with extremely poor flexibility.

[0005] Therefore, there is an urgent need for a flow measurement device connection structure that can improve adaptability and facilitate rapid installation on pipes of different specifications, so as to fully realize the value of PIV / LDV high-end measurement technology. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a natural gas flow measurement device based on PIV / LDV technology, which solves the problems of poor compatibility and inconvenient installation and use of traditional flanges mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a natural gas flow measurement device based on PIV / LDV technology, including a pipeline and a natural gas flow measurement component fixedly installed on the outer wall of the pipeline and connected to the inner cavity of the pipeline. Both ends of the pipeline are fixedly installed with flanges. Four arc-shaped grooves forming annular cavities are opened through the two flanges. Slider blocks are slidably installed in each of the eight arc-shaped grooves. The two ends of the eight sliders are respectively adapted to slide and lock onto the inner groove wall of the corresponding arc-shaped groove. Each of the eight sliders has a strip-shaped hole distributed radially along the flange. Screws are inserted through each of the eight strip-shaped holes.

[0008] Furthermore, the natural gas flow measurement component consists of a tracer particle injection module, an optical illumination module, an image / signal acquisition module, a synchronization and control module, and a data processing and display module.

[0009] Furthermore, both flanges have a central cavity with a diameter consistent with that of the pipe.

[0010] Furthermore, the two opposite inner walls of the arc-shaped groove are respectively provided with a first arc-shaped groove and a second arc-shaped groove.

[0011] Furthermore, each of the eight sliders has an arc-shaped locking block fixedly installed at both ends, and several of the arc-shaped locking blocks are respectively adapted to slide and lock into the corresponding first arc-shaped locking groove and second arc-shaped locking groove.

[0012] Furthermore, the sides of the eight sliders are flush with the corresponding flange sidewalls, and the heads of the eight screws are simultaneously pressed against the sliders and the corresponding flanges.

[0013] The technical solution provided by this utility model has the following advantages compared with the known prior art: The flange of this utility model is no longer limited by the fixed hole position. By sliding the slider, the pitch circle diameter of the bolt can be continuously adjusted; by sliding the screw in the strip hole, the radial position of the bolt can be continuously adjusted. This allows one set of devices to be adapted to a variety of pipe flanges of different standards and specifications, solving the problem of rigid connection with "one-to-one without any margin" and significantly expanding the application scenarios of the equipment.

[0014] During on-site installation, no welding or additional adapter flanges are required. Simply loosen the screws and manually adjust the circumferential position of the slider in the arc groove and the radial position of the screws in the strip hole according to the hole position of the mating flange to easily align the screw holes. After adjustment, tighten the screws to complete the fastening, greatly saving installation time and labor costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the flange mounting structure of this utility model; Figure 3 This is a schematic diagram of the slider mounting structure of this utility model.

[0017] The labels in the diagram represent: 1. Pipeline; 2. Natural gas flow measurement assembly; 3. Flange; 31. Central cavity; 32. Arc groove; 33. First arc groove; 34. Second arc groove; 41. Slider; 42. Strip hole; 43. Screw; 44. Arc block. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] Reference Figure 1-3 This is the first embodiment of the present invention, a natural gas flow measurement device based on PIV / LDV technology, comprising a pipe 1 and a natural gas flow measurement component 2 fixedly installed on the outer wall of the pipe 1 and connected to the inner cavity of the pipe 1. The pipe 1 is made of seamless 304 stainless steel pipe, and the inner wall is mirror polished to ensure flow field quality and optical measurement accuracy. Flanges 3 are fixedly installed at both ends of the pipe 1. The flanges 3 are forged from 35CrMo alloy steel, which has high strength and pressure resistance.

[0020] Four arc-shaped grooves 32 forming annular cavities are formed through the two flanges 3. Each of the eight arc-shaped grooves 32 has a sliding block 41 slidably mounted within it. The sliding blocks 41 are made of ZCuAl10Fe3 manganese bronze alloy, which has good wear resistance and self-lubricating properties. The two ends of the eight sliding blocks 41 are respectively fitted into the inner walls of the corresponding arc-shaped grooves 32. Each of the eight sliding blocks 41 has a radially distributed strip-shaped hole 42, and a screw 43 is inserted into each of the eight strip-shaped holes 42. The screws 43 are high-strength A4-80 stainless steel fasteners.

[0021] Natural gas flow measurement component 2 consists of the following modules: Tracer particle injection module: including micron-level atomizer, high-pressure gas source interface and particle delivery pipeline, made of 316L stainless steel, capable of generating 0.5-2μm DEHS oil mist particles; Optical illumination module: includes a dual-pulse Nd:YAG laser, fiber optic light guide system, sheet light shaping lens group and protective housing, including pulsed laser and light guide system; Image / signal acquisition module: Equipped with a high-speed CMOS camera, telecentric lens, and narrowband filter, including a high-speed camera and its optical lens, or using a fiber optic LDV probe and photomultiplier tube. The image / signal acquisition module can be configured in PIV mode or LDV mode according to measurement requirements: PIV mode is used to acquire the instantaneous flow field and flow rate of the entire cross section; LDV mode is used to perform accurate velocity measurement of high-frequency response at specific points (such as high-speed regions and vortex cores) over a long period of time, for flow field diagnosis or to provide a calibration reference for the PIV system; Synchronization and Control Module: Integrates a high-precision timing controller, trigger signal generator, and equipment status monitoring unit, with time synchronization accuracy better than 5ns; Data processing and display module: Includes an industrial computer, GPU accelerator card and professional analysis software, which processes velocity field data in real time and displays velocity distribution cloud maps.

[0022] The present invention will be further described below with reference to the embodiments.

[0023] Example 1 Reference Figure 1-3 This is the first embodiment of the present invention, which provides a natural gas flow measurement device based on PIV / LDV technology. The measurement process is as follows: First, uniform micron-sized particles are injected into pipe 1 through a tracer particle injection module. Then, an optical illumination module generates a sheet-like laser to illuminate the measurement cross-section. The image / signal acquisition module simultaneously captures particle images or Doppler signals. Finally, the data processing module analyzes and calculates the flow velocity distribution and flow rate value. The entire measurement process does not affect the flow field state within pipe 1, achieving non-contact, high-precision measurement.

[0024] Example 2 Reference Figure 1-3 This is the second embodiment of the present invention, which differs from the first embodiment in that: a central cavity 31, identical in diameter to the inner diameter of the pipe 1, is formed through the center of each of the two flanges 3. The inner surface of the central cavity 31 is plated with a hard chrome layer to improve wear resistance. A first arc-shaped groove 33 and a second arc-shaped groove 34 are respectively formed on the two opposite inner walls of the arc-shaped groove 32. Arc-shaped blocks 44 are fixedly installed at both ends of the eight sliders 41. The arc-shaped blocks 44 are made of polytetrafluoroethylene composite material. Several arc-shaped blocks 44 are slidably inserted into the corresponding first arc-shaped groove 33 and second arc-shaped groove 34. The two sides of the eight sliders 41 are flush with the side walls of the corresponding flanges 3. The heads of the eight screws 43 simultaneously press against the sliders 41 and the corresponding flanges 3.

[0025] Pipeline 1 is also equipped with an insulation layer and an electric heat tracing system on its outer wall to prevent heavy components in the natural gas from condensing in the measurement section. During measurement, the natural gas flow velocity in pipeline 1 ranges from 0.5 to 30 m / s, the operating pressure is 0 to 10 MPa, and the ambient temperature is -40℃ to +60℃. The device is equipped with an automatic purging system to regularly clean the optical window and ensure long-term measurement stability.

[0026] The measuring devices described in the above embodiments are particularly suitable for natural gas trading metering stations, key nodes of gas pipelines, and laboratory calibration devices, providing measurement accuracy better than ±1%, while also possessing good environmental adaptability and ease of maintenance.

[0027] The remaining structure is the same as that in Example 1.

[0028] The installation process is as follows: Pre-alignment preparation The improved flanges 3 at both ends of the measuring device pipe 1 are initially aligned with the flanges of the pipe to be connected, ensuring that the central cavity 31 of the two flanges 3 is concentric with the inner diameter of the pipe to be connected.

[0029] Loose fasteners Manually loosen the eight screws 43 to allow the slider 41 to slide freely within the arc groove 32, while the screws 43 can move radially within the strip hole 42.

[0030] Circumferential position adjustment Based on the actual distribution of the bolt holes on the mating flange, eight sliders 41 are circumferentially slid along the trajectory of the arc groove 32 so that the distribution pattern of the strip holes 42 on all sliders 41 is consistent with the distribution pattern of the bolt holes on the mating flange.

[0031] Radial position adjustment Manually adjust the radial position of each screw 43 within the slot 42 so that the axis of each screw 43 can be precisely aligned with the axis of the corresponding bolt hole on the mating flange.

[0032] Insert connecting bolts Pass eight screws 43 through the bolt holes of the mating flange in sequence, and install washers and nuts on the other end of the screws 43.

[0033] Final tightening Using a diagonal tightening method, tighten the eight nuts evenly one by one with a torque wrench. During the tightening process, the head of the screw 43 will simultaneously press against the slider 41 and the corresponding side wall of the flange 3, achieving triple locking through friction.

[0034] Sealing inspection After all fasteners are installed, perform an airtightness test on the flange connection using the prescribed pressure test procedure to ensure there are no leaks at the connection.

[0035] Measurement preparation Once the flange connection is confirmed to be reliable, the natural gas flow measurement component 2 can be powered on to perform subsequent flow measurement operations.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A natural gas flow measuring device based on PIV / LDV technology, comprising a pipeline (1) and a natural gas flow measuring assembly (2) fixedly installed on the outer wall of the pipeline (1) and communicating with the inner cavity of the pipeline (1), characterized in that, Both ends of the pipe (1) are fixedly installed with flanges (3). Four arc-shaped grooves (32) forming annular cavities are opened through the two flanges (3). Slider (41) is slidably installed in each of the eight arc-shaped grooves (32). The two ends of the eight sliders (41) are respectively adapted to slide and lock on the inner groove wall of the corresponding arc-shaped groove (32). Each of the eight sliders (41) has a strip hole (42) distributed radially along the flange (3). Screws (43) are inserted through each of the eight strip holes (42).

2. A natural gas flow measuring device based on PIV / LDV technology according to claim 1, characterized in that, The natural gas flow measurement component (2) consists of a tracer particle injection module, an optical illumination module, an image / signal acquisition module, a synchronization and control module, and a data processing and display module.

3. The natural gas flow measuring device based on PIV / LDV technology according to claim 1, characterized in that, Both flanges (3) have a central cavity (31) with the same inner diameter as the pipe (1) through their center.

4. The natural gas flow measuring device based on PIV / LDV technology according to claim 1, characterized in that, The two opposite inner walls of the arc-shaped groove (32) are respectively provided with a first arc-shaped slot (33) and a second arc-shaped slot (34).

5. A natural gas flow measuring device based on PIV / LDV technology according to claim 4, characterized in that, Both ends of the eight sliders (41) are fixedly installed with arc-shaped locking blocks (44), and several arc-shaped locking blocks (44) are respectively adapted to slide and lock into the corresponding first arc-shaped locking groove (33) and second arc-shaped locking groove (34).

6. The natural gas flow measuring device based on PIV / LDV technology according to claim 1, characterized in that, The sides of the eight sliders (41) are flush with the sidewalls of the corresponding flanges (3), and the heads of the eight screws (43) press against the sliders (41) and the corresponding flanges (3) at the same time.

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