An LNG refueling machine loop calibration system and method

Abstract

This invention discloses an LNG refueling machine loop calibration system and method. The system includes an LNG refueling machine and an LNG refueling machine calibration device. The LNG refueling machine includes a liquid phase mass flow meter and a gas phase mass flow meter. The LNG refueling machine calibration device includes a calibration filling pipeline and a calibration return gas pipeline, both including liquid phase calibration mass flow meters and gas phase calibration mass flow meters. The gas phase mass flow meter is connected to the gas phase calibration mass flow meter, and a gas annular circulation power device is installed in the connected pipeline. The liquid phase mass flow meter is connected to the liquid phase calibration mass flow meter, and a liquid annular circulation power device is installed in the connected pipeline. This invention forms an annular pipeline calibration device by combining the LNG refueling machine, the LNG refueling machine calibration device, and the liquid and gas annular circulation power devices, effectively ensuring the accuracy of calibration measurements. Simultaneously, the accuracy and repeatability of the LNG refueling machine are detected through fluid circulation, enabling traceability of LNG refueling machine measurements.

Description

Technical Field

[0001] This invention relates to the field of metrology technology, specifically to an LNG refueling machine loop calibration system and method. Background Technology

[0002] Clean fuel refueling systems are cryogenic metering systems that refuel clean fuels into powered ships. Clean fuel refueling is a crucial link in connecting the clean energy industry and the shipbuilding industry for coordinated and sustainable development.

[0003] A refueling machine is a cryogenic metering device used to refuel LNG into a powered vessel. As a metering instrument for LNG fuel trade settlement between suppliers and buyers, its accuracy and reliability are key indicators of its quality. While patent application CN118729158 A discloses a calibration method and system for an LNG refueling machine verification device, which addresses the traceability issue of LNG refueling machines, the accuracy of its verification measurements still needs improvement. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an LNG refueling machine loop calibration system and method to improve the accuracy of calibration measurements while solving the traceability problem of LNG refueling machines.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention provides an LNG refueling machine loop calibration system, comprising an LNG refueling machine and an LNG refueling machine calibration device;

[0007] The LNG refueling machine includes a refueling pipeline and a refueling return pipeline; a liquid phase mass flow meter is installed in the refueling pipeline, and a liquid dispensing gun is installed at the outlet end of the refueling pipeline; a gas phase mass flow meter is installed in the return pipeline.

[0008] The LNG refueling machine calibration device includes a calibration liquid filling pipeline and a calibration return gas pipeline; the calibration mass flow meter includes a liquid phase calibration mass flow meter and a gas phase calibration mass flow meter; the inlet end of the calibration liquid filling pipeline serves as a liquid filling port and is connected to the liquid filling gun, and a liquid phase calibration mass flow meter is installed in the calibration liquid filling pipeline; a gas phase calibration mass flow meter is installed in the calibration return gas pipeline, and the outlet end of the calibration return gas pipeline serves as a return gas port and is connected to the return gas gun;

[0009] The gas phase mass flow meter is connected to the gas phase calibration mass flow meter, and a gas annular circulation power device is installed in the connected pipeline.

[0010] The liquid phase mass flow meter is connected to the liquid phase calibration mass flow meter, and a liquid annular circulation power device and a cooler are installed in the connected pipeline. The cooler is used to remove the heat generated by the work done on the calibration liquid by the annular liquid annular circulation power device when it circulates.

[0011] Optionally, the pipeline consisting of the liquid annular circulation power device and the cooler is a flow meter detection pipeline, and a flow regulating pipeline is connected in parallel in the flow meter detection pipeline to regulate the flow rate flowing into the flow meter detection pipeline.

[0012] Optionally, the LNG refueling machine loop calibration system further includes a liquid replenishment power unit, which is used to replenish calibration liquid into the flow meter detection pipeline.

[0013] Optionally, the LNG refueling machine loop calibration system further includes a gas-liquid storage tank, which is used to store calibration liquid and, after pressure regulation, delivers the calibration liquid to the liquid replenishment power unit.

[0014] Optionally, a regulating valve is provided in the pipeline between the gas phase calibration mass flow meter and the gas annular circulation power unit.

[0015] Optionally, the LNG refueling machine shown also includes an electrical control and display module, which is connected to a liquid mass flow meter and a gas mass flow meter respectively, to display the detected flow data.

[0016] Secondly, the present invention provides an LNG refueling machine loop calibration method, based on the above-mentioned LNG refueling machine loop calibration system, characterized in that it includes:

[0017] Start the LNG refueling machine and LNG refueling machine calibration device for pre-cooling.

[0018] During the precooling cycle, observe the state parameters of the cryogenic liquid used for testing. When the test conditions are met, adjust the circulation flow rate of the LNG testing device to the set flow rate value according to the set test flow rate point. After running for a few minutes, the fluid state stabilizes.

[0019] After the fluid state stabilizes, the gas-liquid flow rate of the LNG calibration device and the flow rate of the LNG dispenser are collected simultaneously. The cumulative mass flow rate value output by the LNG standard device is recorded and compared with the cumulative mass flow rate value of the LNG dispenser within one minute to determine the error of the LNG dispenser. The above operation is repeated, and the repeatability is calculated multiple times to determine the accuracy level of the LNG dispenser.

[0020] Compared with the prior art, the advantages of this invention are as follows:

[0021] The LNG refueling machine loop calibration system of this invention forms a loop pipeline calibration device by combining the LNG refueling machine, the LNG refueling machine calibration device, and the liquid and gas loop circulation power device. This effectively ensures the accuracy of the calibration measurement, and at the same time, it detects the accuracy and repeatability of the LNG refueling machine through fluid circulation, realizing the traceability of the LNG refueling machine's measurement values. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the composition of the LNG refueling machine loop calibration system provided in the embodiments of this application;

[0023] In the diagram: 1. LNG refueling machine; 11. Liquid phase mass flow meter; 12. Refueling nozzle; 13. Pneumatic valve; 14. Gas phase mass flow meter; 15. Return gas nozzle; 16. Electrical control and display module; 2. LNG refueling machine calibration device; 21. Liquid phase calibration mass flow meter; 22. Gas phase calibration mass flow meter; 3. Gas annular circulation power unit; 4. Liquid annular circulation power unit; 5. Cooler; 6. Flow regulation pipeline; 7. Liquid replenishment power unit; 8. Gas-liquid storage tank; 9. Regulating valve. Detailed Implementation

[0024] Example:

[0025] 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.

[0026] See Figure 1 As shown, the LNG refueling machine loop calibration system provided in this embodiment mainly includes an LNG refueling machine 1 and an LNG refueling machine calibration device 2.

[0027] The LNG refueling machine 1 includes a refueling pipeline and a refueling return gas pipeline; a liquid phase mass flow meter 11 is installed in the refueling pipeline, and a liquid dispensing gun 12 is installed at the outlet end of the refueling pipeline; a pneumatic valve 13 is installed between the liquid dispensing gun 12 and the liquid phase mass flow meter in the refueling pipeline, and the amount of gas dispensed is adjusted by controlling the pneumatic valve 13; a gas phase mass flow meter 14 is installed in the return gas pipeline, and a return gas gun 15 is installed at the inlet end of the return gas pipeline. The calibration device 2 includes a calibration liquid filling pipeline and a calibration return gas pipeline. The inlet end of the calibration liquid filling pipeline serves as a liquid filling port, which is connected to the liquid filling gun 12. A liquid phase calibration mass flow meter 21 is installed in the calibration liquid filling pipeline. A gas phase calibration mass flow meter 22 is installed in the calibration return gas pipeline. The outlet end of the calibration return gas pipeline serves as a return gas port, which is connected to the return gas gun. In other words, the LNG calibration device and the LNG refueling machine are connected in series. By comparing the detection data of the mass flow meter in the LNG refueling machine with the detection data of the calibration mass flow meter, the accuracy and repeatability of the LNG refueling machine can be determined, thereby solving the traceability problem of the LNG refueling machine.

[0028] The gas phase mass flow meter 14 is connected to the gas phase calibration mass flow meter 22, and a gas annular circulation power device 3 is installed in the connected pipeline to form a gas annular channel for calibration. The liquid phase mass flow meter 11 is connected to the liquid phase calibration mass flow meter 21, and a liquid annular circulation power device 4 and a cooler 5 are installed in the connected pipeline. The cooler 5 is used to remove the heat generated by the work done by the liquid annular circulation power device 4 on the calibration liquid during circulation, so as to maintain the temperature of the calibration liquid at the temperature before entering the LNG refueling machine, and ensure that the temperature of the calibration liquid in the flow meter calibration area is stable within a certain range. In this way, by setting up the gas annular circulation power device 3 and the liquid annular circulation power device 4, the power can be provided for the circulation flow of the calibration liquid and gas in the annular pipeline to compensate for the friction loss of the calibration liquid and gas flowing in the annular pipeline and the pressure loss of the fluid passing through various equipment, and to provide a certain working condition detection flow rate for the detection area to ensure the accuracy of the calibration measurement.

[0029] Therefore, the LNG refueling machine loop calibration system provided in this embodiment effectively ensures the accuracy of calibration measurements by forming a loop calibration device with the LNG refueling machine, the LNG refueling machine calibration device, and the liquid and gas loop circulation power device. At the same time, it detects the accuracy and repeatability of the LNG refueling machine through fluid circulation, and realizes the traceability of the LNG refueling machine's measurement values.

[0030] In one specific embodiment, the pipeline formed by the liquid annular circulation power unit 4 and the cooler 5 is a flow meter detection pipeline. A flow regulating pipeline 6 is connected in parallel within the flow meter detection pipeline to regulate the flow rate flowing into it. During the LNG refueling machine calibration process, temperature, as a component of the flow measurement uncertainty assessment, must be strictly controlled within a certain range. The function of the flow regulating pipeline is to regulate the flow rate of the liquid entering the flow meter detection pipeline. When the liquid flow rate range required for flow meter calibration exceeds the flow regulation range of the annular circulation power unit itself (typically, the flow regulation range achieved by the liquid circulation power unit through speed adjustment is 60%–110%), the flow regulating pipeline 6 is bypassed, thereby regulating the flow rate flowing into the flow meter detection pipeline to verify the accuracy of the measurement.

[0031] In a preferred embodiment, the LNG refueling machine loop calibration system further includes a liquid replenishment power unit 7, which is used to replenish the calibration liquid into the flow meter detection pipeline. Thus, by including the liquid replenishment power unit, two purposes are achieved: first, liquid is replenished into the loop pipeline to reach the required calibration pressure; second, the loss of calibration liquid in the loop system due to sealing gas consumption and system pipeline depressurization during the operation of the loop detection system is compensated for, thereby further ensuring the accuracy of the calibration measurement. Furthermore, the LNG refueling machine loop calibration system of this embodiment also includes a gas-liquid storage tank 8, which is used to store the calibration liquid and, after pressure regulation, delivers the calibration liquid to the liquid replenishment power unit.

[0032] In a preferred embodiment, a regulating valve 9 is provided in the pipeline between the gas phase calibration mass flow meter 14 and the gas annular circulation power device 9 to facilitate the adjustment of the amount of calibration gas.

[0033] In one specific embodiment, the LNG refueling machine further includes an electronic control and display module 16, which is connected to the liquid mass flow meter 11 and the gas mass flow meter 14 respectively, for displaying the detected flow data.

[0034] Accordingly, this embodiment provides an LNG refueling machine loop calibration method, based on the above-mentioned LNG refueling machine loop calibration system, including:

[0035] Start the LNG refueling machine and LNG refueling machine calibration device for pre-cooling.

[0036] During the precooling cycle, observe the state parameters of the cryogenic liquid used for testing. When the test conditions are met, adjust the circulation flow rate of the LNG testing device to the set flow rate value according to the set test flow rate point. After running for a few minutes, the fluid state stabilizes.

[0037] After the fluid state stabilizes, the gas-liquid flow rate of the LNG calibration device and the flow rate of the LNG dispenser are collected simultaneously. The cumulative mass flow rate value output by the LNG standard device is recorded and compared with the cumulative mass flow rate value of the LNG dispenser within one minute to determine the error of the LNG dispenser. The above operation is repeated, and the repeatability is calculated multiple times to determine the accuracy level of the LNG dispenser.

[0038] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An LNG refueling machine loop calibration system, characterized in that, Includes LNG refueling machines and LNG refueling machine calibration devices; The LNG refueling machine includes a refueling pipeline and a refueling return pipeline; a liquid phase mass flow meter is installed in the refueling pipeline, and a liquid dispensing gun is installed at the outlet end of the refueling pipeline; a gas phase mass flow meter is installed in the refueling return pipeline. The LNG refueling machine calibration device includes a calibration liquid filling pipeline and a calibration return gas pipeline; the calibration mass flow meter includes a liquid phase calibration mass flow meter and a gas phase calibration mass flow meter; the inlet end of the calibration liquid filling pipeline serves as a liquid filling port and is connected to the liquid filling gun, and a liquid phase calibration mass flow meter is installed in the calibration liquid filling pipeline; a gas phase calibration mass flow meter is installed in the calibration return gas pipeline, and the outlet end of the calibration return gas pipeline serves as a return gas port and is connected to the return gas gun; The gas phase mass flow meter is connected to the gas phase calibration mass flow meter, and a gas annular circulation power device is installed in the connected pipeline. The liquid phase mass flow meter is connected to the liquid phase calibration mass flow meter, and a liquid annular circulation power device and a cooler are installed in the connected pipeline. The cooler is used to remove the heat generated by the liquid annular circulation power device when the calibration liquid is circulating. The pipeline consisting of the liquid annular circulation power device and the cooler is a flow meter detection pipeline. A flow regulating pipeline is connected in parallel in the flow meter detection pipeline to regulate the flow rate flowing into the flow meter detection pipeline. It also includes a liquid replenishment power device, which is used to replenish calibration liquid into the flow meter detection pipeline; It also includes a gas-liquid storage tank, which is used to store the test liquid and, after pressure regulation, delivers the test liquid to the liquid replenishment power device; A regulating valve is installed in the pipeline between the gas phase calibration mass flow meter and the gas annular circulation power unit.

2. The LNG refueling machine loop calibration system as described in claim 1, characterized in that, The LNG refueling machine also includes an electrical control and display module, which is connected to a liquid mass flow meter and a gas mass flow meter respectively, to display the detected flow data.

3. A method for calibrating the loop of an LNG refueling machine, based on the LNG refueling machine loop calibration system of claim 1, characterized in that, include: Start the LNG refueling machine and LNG refueling machine calibration device for pre-cooling; During the precooling cycle process, observe the state parameters of the cryogenic liquid used for testing. When the test conditions are met, adjust the circulation flow rate of the LNG refueling machine testing device to the set flow rate value according to the set test flow rate point. Run for a few minutes until the fluid state stabilizes. After the fluid state stabilizes, the gas-liquid flow rate of the LNG dispenser calibration device and the flow rate of the LNG dispenser are collected simultaneously. The cumulative mass flow rate value output by the LNG standard device within one minute is recorded and compared with the cumulative mass flow rate value of the LNG dispenser to determine the error of the LNG dispenser. The above operation is repeated, and the repeatability is calculated multiple times to determine the accuracy level of the LNG dispenser.

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