LNG (Liquefied Natural Gas) filling machine loop calibration system and method

Abstract

The invention discloses an LNG (Liquefied Natural Gas) filling machine loop calibration system and method. The system comprises an LNG filling machine and an LNG filling machine calibrating device, the LNG filling machine comprises a liquid phase mass flow meter and a gas phase mass flow meter; the LNG filling machine calibrating device comprises a calibrating liquid adding pipeline and a calibrating gas return pipeline, wherein the calibrating gas return pipeline comprises a liquid-phase calibrating mass flowmeter and a gas-phase calibrating mass flowmeter; the gas phase mass flow meter is connected with the gas phase verification mass flow meter, and a gas annular circulation power device is arranged in a pipeline for connecting the gas phase mass flow meter and the gas phase verification mass flow meter; the liquid phase mass flow meter is connected with the liquid phase verification mass flow meter, and a liquid annular circulation power device is arranged in a pipeline for connecting the liquid phase mass flow meter and the liquid phase verification mass flow meter. An annular pipeline calibration device is formed by the LNG filling machine, the LNG filling machine calibration device and the liquid and gas annular circulation power device, the accuracy of calibration measurement is effectively guaranteed, meanwhile, the accuracy and repeatability of the LNG filling machine are detected through fluid circulation, and traceability of the quantity value of the LNG filling machine is achieved.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, and in particular to a LNG filling machine loop calibration system and method. Background Art

[0002] The clean fuel filling system is an ultra-low temperature metering system for filling clean fuel into power vessels. Clean fuel filling is the most critical link in connecting the clean energy industry and the shipping industry for coordinated and sustainable development.

[0003] A filling machine is an ultra-low temperature metering device for filling LNG fuel into a power ship. The filling machine is a metering instrument for trade settlement between the supply and demand sides of LNG fuel. Its metering accuracy and reliability are key indicators for measuring the quality of the filling machine. Although the calibration method and system for the LNG filling machine calibration device disclosed in patent document CN118729158 A can solve the traceability problem of the LNG filling machine, the accuracy of its calibration measurement still needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a LNG filling machine loop calibration system and method so as to improve the accuracy of verification measurement while solving the traceability problem of the LNG filling machine.

[0005] To achieve the above object, the technical solution of the present invention is:

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

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

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

[0009] The gas phase mass flowmeter is connected to the gas phase verification mass flowmeter, and a gas annular circulation power device is arranged in the connected pipeline;

[0010] The liquid mass flowmeter is connected to the liquid calibration mass flowmeter, and a liquid annular circulation power device and a cooler are arranged in the connected pipelines. The cooler is used to take away the heat generated by the annular liquid annular circulation power device when the calibration liquid circulates due to the work done on it by the annular liquid annular circulation power device.

[0011] Optionally, the pipeline formed by the liquid annular circulation power device and the cooler is a flow meter detection pipeline, and a flow regulating pipeline is arranged in parallel in the flow meter detection pipeline to regulate the flow flowing into the flow meter detection pipeline.

[0012] Optionally, the LNG filling machine loop calibration system further includes a liquid replenishing power device, and the liquid replenishing power device is used to replenish calibration liquid into the flow meter detection pipeline.

[0013] Optionally, the LNG filling machine loop calibration system further comprises a gas-liquid storage tank, which is used to store calibration liquid and transports the calibration liquid to the liquid replenishing power device after pressure regulation.

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

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

[0016] In a second aspect, the present invention provides a LNG filling machine loop calibration method, based on the above-mentioned LNG filling machine loop calibration system, characterized by comprising:

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

[0018] During the pre-cooling cycle process, observe the state parameters of the cryogenic liquid used for calibration. When the test conditions are met, adjust the circulation flow of the LNG calibration device to the set flow value according to the set test flow point, and run it for a few minutes until the fluid state stabilizes.

[0019] After the fluid state is stable, the gas-liquid flow rate of the LNG calibration device and the flow rate of the LNG filling machine are collected synchronously, and the cumulative mass flow value output by the LNG standard device is recorded within one minute and compared with the cumulative mass flow value of the LNG filling machine to determine the error of the LNG filling machine; repeat the above operation, measure and calculate the repeatability multiple times, and determine the accuracy level of the LNG filling machine.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The LNG filling machine loop calibration system of the present invention forms a ring pipeline calibration device by combining the LNG filling machine, the LNG filling machine calibration device, and the liquid and gas ring circulation power device, which effectively ensures the accuracy of the calibration measurement, and at the same time detects the accuracy and repeatability of the LNG filling machine through fluid circulation, thereby realizing the traceability of the LNG filling machine measurement value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the composition of the LNG filling machine loop calibration system provided in an embodiment of the present application;

[0023] In the figure: 1. LNG filling machine; 11. Liquid phase mass flowmeter; 12. Liquid filling gun; 13. Pneumatic valve; 14. Gas phase mass flowmeter; 15. Return air gun; 16. Electronic control and display module; 2. LNG filling machine calibration device; 21. Liquid phase calibration mass flowmeter; 22. Gas phase calibration mass flowmeter; 3. Gas annular circulation power unit; 4. Liquid annular circulation power unit; 5. Cooler; 6. Flow regulating pipeline; 7. Liquid replenishment power unit; 8. Gas and liquid storage tank; 9. Regulating valve. DETAILED DESCRIPTION

[0024] Example:

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

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

[0027] The LNG filling machine 1 includes a filling pipeline and a filling return gas pipeline; a liquid mass flowmeter 11 is arranged in the filling pipeline, and a liquid filling gun 12 is installed at the outlet end of the filling pipeline; in the filling pipeline, a pneumatic valve 13 is arranged between the liquid filling gun 12 and the liquid mass flowmeter, and the amount of gas added is adjusted by controlling the pneumatic valve 13; a gas mass flowmeter 14 is arranged in the return gas pipeline, and a return gas gun 15 is installed at the inlet end of the return gas pipe. The calibration device 2 includes a calibration liquid adding pipeline and a calibration air return pipeline; the inlet end of the calibration liquid adding pipeline serves as a liquid adding port to be connected to the liquid adding gun 12, and a liquid phase calibration mass flowmeter 21 is arranged in the calibration liquid adding pipeline; a gas phase calibration mass flowmeter 22 is arranged in the calibration return air pipeline, and the outlet end of the calibration return air pipeline serves as a return air port to be connected to the return air gun; that is, the LNG calibration device and the LNG filling machine are connected in series, and the accuracy and repeatability of the LNG filling machine can be determined by comparing the detection data of the mass flowmeter in the LNG filling machine with the detection data of the calibration mass flowmeter, thereby solving the traceability problem of the LNG filling machine.

[0028] The gas phase mass flowmeter 14 is connected to the gas phase calibration mass flowmeter 22, and a gas annular circulation power device 3 is arranged in the connected pipeline, so as to form a gas annular channel for calibration. The liquid phase mass flowmeter 11 is connected to the liquid phase calibration mass flowmeter 21, and a liquid annular circulation power device 4 and a cooler 5 are arranged in the connected pipeline. The cooler 5 is used to take away the heat generated by the annular liquid annular circulation power device 4 when the calibration liquid circulates, so that the temperature of the calibration liquid is maintained at the temperature before entering the LNG filling machine, so as to ensure that the calibration liquid temperature in the flowmeter calibration area is stable within a certain range; in this way, by providing the gas annular circulation power device 3 and the liquid annular circulation power device 4, it is possible to provide power for the circulation of the calibration liquid and gas in the annular pipeline, so as 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 each device, and provide a certain working condition detection flow for the detection area to ensure the accuracy of the calibration measurement.

[0029] It can be seen that the LNG filling machine ring calibration system provided in this embodiment forms a ring pipeline calibration device by integrating the LNG filling machine, the LNG filling machine calibration device, and the liquid and gas ring circulation power device, thereby effectively ensuring the accuracy of the calibration measurement, and at the same time detecting the accuracy and repeatability of the LNG filling machine through fluid circulation, thereby realizing the traceability of the LNG filling machine measurement value.

[0030] In a specific embodiment, the pipeline composed of the liquid annular circulation power device 4 and the cooler 5 is a flow meter detection pipeline, and a flow regulating pipeline 6 is arranged in parallel in the flow meter detection pipeline to adjust the flow rate flowing into the flow meter detection pipeline. During the calibration of the LNG filling machine, the temperature is used as a component of the flow measurement uncertainty assessment, and its variation range should be strictly controlled within a certain range. The function of the flow regulating pipeline is to adjust the flow rate of the liquid entering the flow meter detection pipeline. When the liquid flow range required for the flow meter calibration exceeds the flow regulation range of the annular circulation power device itself (usually the flow regulation range achieved by the liquid circulation power device through speed regulation is 60% to 110%), the flow regulating pipeline 6 is bypassed to adjust the flow rate flowing into the flow meter detection pipeline to calibrate the accuracy of the measurement.

[0031] In a preferred embodiment, the LNG filling machine loop calibration system further includes a liquid replenishment power device 7, which is used to replenish calibration liquid into the flow meter detection pipeline. In this way, by providing a liquid replenishment power device, firstly, liquid is replenished into the loop pipeline to achieve the required calibration pressure; secondly, the loss of calibration liquid in the loop system caused by the pressure relief of the sealing gas and the system pipeline during the operation of the loop detection system is replenished to further ensure the accuracy of the calibration measurement. In addition, the LNG filling machine loop calibration system of this embodiment further includes a gas-liquid storage tank 8, which is used to store calibration liquid, and the liquid replenishment power device often transports the calibration liquid after pressure regulation.

[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 adjustment of the amount of calibration gas.

[0033] In a specific embodiment, in addition, the LNG filling machine also 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 to display the detected flow data.

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

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

[0036] During the pre-cooling cycle process, observe the state parameters of the cryogenic liquid used for calibration. When the test conditions are met, adjust the circulation flow of the LNG calibration device to the set flow value according to the set test flow point, and run it for a few minutes until the fluid state stabilizes.

[0037] After the fluid state is stable, the gas-liquid flow rate of the LNG calibration device and the flow rate of the LNG filling machine are collected synchronously, and the cumulative mass flow value output by the LNG standard device is recorded within one minute and compared with the cumulative mass flow value of the LNG filling machine to determine the error of the LNG filling machine; repeat the above operation, measure and calculate the repeatability multiple times, and determine the accuracy level of the LNG filling machine.

[0038] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. A LNG filling machine loop calibration system, characterized in that: Including LNG filling machine and LNG filling machine verification device; The LNG filling machine includes a filling pipeline and a filling return air pipeline; a liquid phase mass flow meter is arranged in the filling pipeline, and a liquid filling gun is installed at the outlet end of the filling pipeline; a gas phase mass flow meter is arranged in the return air pipeline; The LNG filling machine calibration device includes a calibration liquid adding pipeline and a calibration gas return pipeline; the calibration mass flowmeter includes a liquid phase calibration mass flowmeter and a gas phase calibration mass flowmeter; the inlet end of the calibration liquid adding pipeline serves as a liquid adding port to be connected to a liquid adding gun, and a liquid phase calibration mass flowmeter is arranged in the calibration liquid adding pipeline; a gas phase calibration mass flowmeter is arranged in the calibration gas return pipeline, and the outlet end of the calibration gas return pipeline serves as a gas return port to be connected to a gas return gun; The gas phase mass flowmeter is connected to the gas phase verification mass flowmeter, and a gas annular circulation power device is arranged in the connected pipeline; The liquid mass flowmeter is connected to the liquid calibration mass flowmeter, and a liquid annular circulation power device and a cooler are arranged in the connected pipelines. The cooler is used to take away the heat generated by the annular liquid annular circulation power device when the calibration liquid circulates due to the work done on it by the annular liquid annular circulation power device.

2. The LNG filling machine loop calibration system according to claim 1, characterized in that: The pipeline formed by the liquid annular circulation power device and the cooler is a flow meter detection pipeline, and a flow regulating pipeline is arranged in parallel in the flow meter detection pipeline to regulate the flow flowing into the flow meter detection pipeline.

3. The LNG filling machine loop calibration system according to claim 1 or 2, characterized in that: It also includes a liquid replenishing power device, which is used to replenish calibration liquid into the flow meter detection pipeline.

4. The LNG filling machine loop calibration system according to claim 3, characterized in that: It also includes a gas-liquid storage tank, which is used to store the calibration liquid and transport the calibration liquid to the liquid replenishing power device after pressure regulation.

5. The LNG filling machine loop calibration system according to claim 1, characterized in that: A regulating valve is arranged in the pipeline between the gas phase verification mass flow meter and the gas annular circulation power device.

6. The LNG filling machine loop calibration system according to claim 1, characterized in that: The LNG filling machine shown also includes an electronic control and display module, which is connected to the liquid mass flow meter and the gas mass flow meter respectively to display the detected flow data.

7. A LNG filling machine loop calibration method, based on the LNG filling machine loop calibration system according to claim 1, characterized in that: include: Start the LNG filling machine and LNG filling machine calibration device for precooling; During the pre-cooling cycle, observe the state parameters of the cryogenic liquid used for verification. When the test conditions are met, adjust the circulation flow of the LNG verification device to the set flow value according to the set test flow point, and run for a few minutes until the fluid state is stable; After the fluid state is stable, the gas-liquid flow rate of the LNG calibration device and the flow rate of the LNG filling machine are collected synchronously, and the cumulative mass flow value output by the LNG standard device is recorded within one minute and compared with the cumulative mass flow value of the LNG filling machine to determine the error of the LNG filling machine; repeat the above operation, measure and calculate the repeatability multiple times, and determine the accuracy level of the LNG filling machine.

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