Gas energy flow measurement standard device

Abstract

The utility model discloses a gas energy flow measurement standard device which comprises a main pipeline, and a gas inlet of the main pipeline is used for being connected with a gas outlet of a detected flow meter. And an outer clamping type ultrasonic flowmeter is clamped on the outer wall of the main pipeline. The external clamping type ultrasonic flowmeter is adopted as a standard device to measure the flow of the main pipeline, calibration can be carried out without disassembly, inconvenience and potential risks caused by disassembly of the flowmeter are avoided, calibration time and cost are greatly reduced, and the method is suitable for pipelines of various sizes and materials and high in adaptability.

Description

Technical Field

[0001] This utility model relates to the field of metrology technology, specifically to a gas energy flow metering standard device. Background Technology

[0002] Natural gas, hydrogen fuel, and water gas are becoming increasingly widely used as high-quality clean energy sources. Accurate metering of these gaseous energy sources has become a crucial task for various industries. Currently, flow meters used to measure natural gas, hydrogen fuel, and water gas are all medium- and high-pressure flow meters. However, these flow meters are difficult to trace and verify against actual media, resulting in high verification costs and inconvenient disassembly and assembly. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a gas energy flow metering standard device.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A gas energy flow metering standard device includes a main pipeline, the inlet of which is connected to the outlet of the flow meter being tested; an external clamp-on ultrasonic flow meter is mounted on the outer wall of the main pipeline.

[0006] Optionally, a temperature sensor is attached to the outer wall of the main pipeline; a pressure sensor is also installed in the main pipeline.

[0007] Optionally, the gas energy flow metering standard device further includes a pipe diameter measuring instrument and an ultrasonic thickness gauge; the pipe diameter measuring instrument is used to measure the outer diameter of the main pipe, and the ultrasonic thickness gauge is attached to the surface of the main pipe to measure the wall thickness of the main pipe.

[0008] Optionally, the air inlet of the main pipeline and the air outlet of the flow meter under test are connected by a metal bellows.

[0009] Optionally, the metal corrugated pipe includes a pipe body, a front mounting plate is provided at the front end of the pipe body, and a rear mounting plate is provided at the rear end of the pipe body. A first connecting rod is installed in the front mounting plate, and a second connecting rod is installed in the rear mounting plate. The first connecting rod and the second connecting rod are offset from each other and connected by a connecting buckle. The connecting buckle is provided with two connecting holes for the first connecting rod and the second connecting rod to pass through. The first connecting rod and the second connecting rod can move back and forth in the connecting holes.

[0010] Optionally, a temperature sensor is attached to the outer wall of the main pipe.

[0011] Optionally, a pressure gauge may also be installed in the main pipeline.

[0012] Optionally, the temperature sensor is a multi-point temperature sensor array arranged along the circumference and axial direction of the main pipe to monitor the pipe wall temperature distribution in real time.

[0013] Compared with the prior art, the advantages of this utility model are as follows:

[0014] The gas energy flow metering standard device provided in this application uses an external clamp-on ultrasonic flow meter as the standard device to measure the flow of the main pipeline. Calibration can be performed without disassembly, avoiding the inconvenience and potential risks caused by disassembling the flow meter, greatly reducing calibration time and cost, and is suitable for various pipe sizes and materials, with strong adaptability. Attached Figure Description

[0015] Figure 1 A schematic diagram of the working principle of the gas energy flow metering standard device provided in the embodiments of this application;

[0016] Figure 2 A schematic diagram showing the installation of the external clamp-on ultrasonic flow meter, temperature sensor, and pressure sensor on the main pipeline.

[0017] Figure 3 This is a schematic diagram of the structure of a metal bellows;

[0018] In the diagram: 1. Main pipe; 2. Clamp-on ultrasonic flow meter; 3. Temperature sensor; 4. Pipe diameter measuring instrument; 5. Safety valve; 6. Vent valve; 7. Metal bellows; 71. Pipe body; 72. Front mounting plate; 73. Rear mounting plate; 74. First connecting rod; 75. Second connecting rod; 76. Connecting buckle; 8. Ultrasonic thickness gauge; 9. Pressure gauge. Detailed Implementation

[0019] Example:

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0026] See Figure 1 As shown, the gas energy flow metering standard device provided in this application embodiment mainly includes a main pipeline 1. The air inlet of the main pipeline 1 is used to connect with the air outlet of the flow meter under test. Since the air inlet of the main pipeline 1 is used to connect with the air outlet of the flow meter under test, the accuracy of the flow meter under test can be determined by detecting the flow rate of the main pipeline and comparing the flow rate of the main pipeline with the flow rate data of the flow meter under test. For this purpose, an external clamp ultrasonic flow meter 2 is clamped on the outer wall of the main pipeline 1. In this way, by using the external clamp ultrasonic flow meter 2 as a standard device to measure the flow velocity of the main pipeline and combining it with the cross-sectional area of ​​the main pipeline, the flow rate of the main pipeline can be obtained. Calibration can be performed without disassembly, thereby solving the problem that gas energy flow metering instruments are difficult to disassemble and assemble.

[0027] Therefore, the gas energy flow metering standard device provided in this application embodiment measures the flow of the main pipeline by using an external clamp-on ultrasonic flow meter as the standard device. Calibration can be performed without disassembly, avoiding the inconvenience and potential risks caused by disassembling the flow meter, greatly reducing calibration time and cost, and is suitable for various pipe sizes and materials, with strong adaptability.

[0028] In the application scenario of offshore floating LNG bunkering platforms, pipelines face vibration and stress issues caused by sea waves during testing. Severe movement can lead to loosening, seal failure, or even fatigue cracks at the connection between the main pipeline's inlet and the flow meter's outlet, posing a safety hazard of LNG leakage. Therefore, in a preferred embodiment, the inlet of the main pipeline and the outlet of the flow meter are connected by a metal bellows 7. The metal bellows can absorb pipeline vibration and displacement, effectively reducing pipeline stress concentration. Specifically, as... Figure 3As shown, the metal corrugated pipe 7 includes a pipe body 71, a front mounting plate 72 at the front end of the pipe body 71, and a rear mounting plate 73 at the rear end of the pipe body 71. A first connecting rod 74 is installed in the front mounting plate 72, and a second connecting rod 75 is installed in the rear mounting plate 73. The first connecting rod 74 and the second connecting rod 75 are offset from each other and connected by a connecting buckle 76. The connecting buckle 76 has two connecting holes for the first connecting rod 74 and the second connecting rod 75 to pass through. The first connecting rod 74 and the second connecting rod 75 can move back and forth in the connecting holes. Thus, since the first connecting rod and the second connecting rod are connected by the offset connection of the connecting buckle, and the first connecting rod and the second connecting rod can move back and forth in the connecting holes, they can absorb pipeline vibration and displacement, effectively reduce pipeline stress concentration, and solve the problem of loosening and sealing failure at the connection between the air inlet of the main pipeline and the air outlet of the flow meter under test due to violent movement.

[0029] In a preferred embodiment, to determine the cross-sectional area of ​​the main pipeline when its diameter is unknown, the gas energy flow metering standard device further includes a pipe diameter measuring instrument 4 and an ultrasonic thickness gauge 8. The pipe diameter measuring instrument 4 measures the outer diameter of the main pipeline, and the ultrasonic thickness gauge 8 is attached to the surface of the main pipeline to measure its wall thickness. Thus, the outer diameter of the main pipeline can be measured using the pipe diameter measuring instrument, and the wall thickness can be measured using the ultrasonic thickness gauge 8. Therefore, by measuring the outer diameter and wall thickness of the main pipeline, the cross-sectional area of ​​the main pipeline can be obtained. In this embodiment, the pipe diameter measuring instrument 4 is a LOTISQC40 pipe diameter measuring device from Quest Systems, USA, and the ultrasonic thickness gauge 8 is an OU1600 ultrasonic thickness gauge manufactured by Cangzhou Oupu Company.

[0030] In a preferred embodiment, a first bypass and a second bypass are respectively provided at the front and rear ends of the main pipeline 1. A safety valve 5 is installed in the first bypass, and a vent valve 6 is installed in the second bypass. When the flow rate in the main pipeline 1 exceeds the threshold set by the safety valve, the vent valve opens to vent the flow, thereby ensuring the safety of the main pipeline.

[0031] In a preferred embodiment, a temperature sensor 3 is attached to the outer wall of the main pipeline 1; a pressure gauge 9 is installed in the main pipeline 1; the temperature sensor 3 uses a high-precision PT100 sensor for real-time temperature compensation. The PT100 sensor is directly attached to the outside of the pipeline using a patch type, eliminating the need for secondary installation of the pipeline and making operation convenient. If a temperature transmitter is available on-site and its signal is measured, it can be directly acquired. The pressure gauge 9 uses a high-precision pressure sensor for pressure compensation or uses an on-site pressure device (measured) to acquire pressure values ​​for compensation.

[0032] In large-scale liquefied natural gas (LNG) receiving terminal applications, clamp-on ultrasonic flow meters face the challenge of measurement accuracy in low-temperature environments. LNG is typically stored at around -162°C, and this extreme temperature affects the performance of ultrasonic sensors and the acoustic properties of pipe materials, leading to increased measurement errors. To address this, a multi-point temperature sensor array is used, arranged circumferentially and axially along the main pipeline, to monitor the pipe wall temperature distribution in real time. By collecting multi-point temperature data and combining it with a thermal field simulation module to calculate the internal temperature distribution of the main pipeline, and then using a material acoustic properties database, the sound wave propagation characteristics at the current temperature are calculated to dynamically adjust the ultrasonic signal transmission frequency, receiving gain, and signal processing parameters, thereby significantly improving measurement accuracy in low-temperature environments.

[0033] The above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the substance of the content of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A gas energy flow metering standard device, characterized in that, Includes a main pipe, the air inlet of which is used to connect to the air outlet of the flow meter under test; an external clamp ultrasonic flow meter is clamped on the outer wall of the main pipe; The air inlet of the main pipeline and the air outlet of the flow meter under test are connected by a metal bellows. The corrugated metal pipe includes a pipe body, a front mounting plate at the front end of the pipe body, and a rear mounting plate at the rear end of the pipe body. A first connecting rod is installed in the front mounting plate, and a second connecting rod is installed in the rear mounting plate. The first and second connecting rods are offset from each other and connected by a connecting buckle. The connecting buckle has two connecting holes for the first and second connecting rods to pass through. The first and second connecting rods can move back and forth in the connecting holes.

2. The gas energy flow metering standard device as described in claim 1, characterized in that, It also includes a pipe diameter measuring instrument and an ultrasonic thickness gauge; the pipe diameter measuring instrument is used to measure the outer diameter of the main pipe; the ultrasonic thickness gauge is attached to the surface of the main pipe and is used to measure the wall thickness of the main pipe.

3. The gas energy flow metering standard device as described in claim 1, characterized in that, A pressure gauge is also installed in the main pipeline.

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