Calibration system for LNG (Liquefied Natural Gas) filling machine calibrating device

Abstract

In order to solve the traceability problem of the LNG filling machine calibrating device, the utility model discloses a mass real flow calibration system for the LNG filling machine calibrating device, which is used for calibrating the LNG filling machine calibrating device. The system comprises an LNG filling machine, an LNG filling machine calibrating device and an LNG storage tank which are connected in sequence, and the LNG filling machine calibrating device comprises a calibrating mass flow meter used for detecting the accumulated mass flow value in a pipeline; a high-precision mass sensor is installed in the LNG storage tank and used for detecting the accumulated mass flow value of the LNG storage tank. By recording the accumulated mass flow value output by the calibration mass flowmeter and the accumulated mass flow value output by the high-precision mass sensor within the same time and comparing the accumulated mass flow value with the accumulated mass flow value, the error of the LNG filling machine calibration device can be determined.

Description

Technical Field

[0001] The utility model relates to the technical field of verification and measurement, and in particular to a calibration system for a verification device of an LNG filling machine. Background Art

[0002] The promotion and application of liquefied natural gas (LNG) as a clean fuel in the field of power ships has made great progress. However, the construction of supporting infrastructure in the field of ships, such as fuel filling and filling machine calibration, is relatively lagging, which affects the promotion and application of liquefied natural gas. In my country, the water level of inland rivers such as the Pearl River and the Yangtze River varies greatly, and LNG tankers and shore stations cannot meet the refueling needs of LNG-powered ships on the water. Therefore, refueling of LNG-powered ships has become a problem in the promotion and application of liquefied natural gas in power ships.

[0003] With the development of technology, the floating LNG filling station can overcome the large changes in inland water levels, and has multiple functions such as fuel filling and water filling. It has been widely used in marine LNG sales terminals. The core equipment of the floating LNG filling station, the ship filling machine, is an ultra-low temperature metering system for filling fuel into the power ship. The power ship filling machine is a measuring instrument for trade settlement between the fuel supply and demand parties. Its measurement accuracy and reliability are key indicators for measuring the quality of the filling machine. The LNG filling machine calibration device is used to test the measurement accuracy and repeatability of the liquefied natural gas filling machine. At present, the calibration work of the power ship filling machine by domestic and foreign metrological verification institutions and ship manufacturers is in the initial stage. However, the traceability of the filling machine calibration device has not been resolved, which is a very serious problem for the integrity of the traceability system and the fairness of trade transfer. The establishment of a value traceability system for the LNG filling machine calibration device is of great significance for promoting quality inspection technical institutions to carry out LNG filling machine metrological calibration work, ensuring the fairness of trade results, and promoting the development and technological progress of my country's LNG industry. Utility Model Content

[0004] In order to solve the traceability problem of the LNG filling machine verification device, the utility model provides a mass real flow calibration system for the LNG filling machine verification device to calibrate the LNG filling machine verification device.

[0005] To achieve the above purpose, the technical solution of the utility model is:

[0006] A calibration system for an LNG filling machine calibration device comprises an LNG filling machine, an LNG filling machine calibration device and an LNG gas storage tank which are connected in sequence; the LNG filling machine calibration device comprises a calibration mass flow meter for detecting the cumulative mass flow value in the pipeline; a high-precision mass sensor is installed in the LNG gas storage tank for detecting the cumulative mass flow value of the LNG gas storage tank.

[0007] Furthermore, the calibration mass flow meter and the high-precision mass sensor are connected to the data processing center to transmit the detected data to the data processing center. The data processing center determines the accuracy of the LNG filling machine calibration device based on the cumulative mass flow value detected by the calibration mass flow meter and the high-precision mass sensor.

[0008] Furthermore, the LNG filling machine includes a gas filling pipeline and a filling return gas pipeline; a liquid mass flowmeter is arranged in the gas filling pipeline, and a liquid filling gun is installed at the outlet end of the gas filling pipeline; in the gas filling pipeline, a pneumatic valve is arranged between the liquid filling gun and the liquid mass flowmeter; a gas mass flowmeter is arranged in the return gas pipeline, and a return gas gun is installed at the inlet end of the return gas pipe.

[0009] Furthermore, the LNG filling machine calibration device also includes a calibration liquid adding pipeline and a calibration return air 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 return air pipeline, and the outlet end of the calibration return air pipeline serves as a return air port to be connected to a return air gun.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The utility model connects an LNG filling machine, an LNG filling machine calibration device, and an LNG gas storage tank with a high-precision mass sensor in series, uses the LNG gas storage tank with a high-precision mass sensor as a main standard, detects the accuracy and repeatability of the LNG filling machine measurement calibration device through the filling process, and realizes the traceability of the ship-borne LNG filling machine calibration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the composition of a calibration system for an LNG filling machine verification device provided by an embodiment of the utility model;

[0013] In the figure: 1. LNG filling machine; 2. LNG filling machine calibration device; 3. LNG gas storage tank; 4. Data processing center; 11. Liquid phase mass flow meter; 12. Liquid filling gun; 13. Pneumatic valve; 14. Liquid phase mass flow meter; 15. Return air gun; 21. Liquid phase calibration mass flow meter; 22. Gas phase calibration mass flow meter; 31. Mass sensor. DETAILED DESCRIPTION

[0014] Example:

[0015] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] See also Figure 1 As shown, it is a schematic diagram of the composition of the calibration system for the LNG filling machine calibration device provided by the embodiment of the utility model, including an LNG filling machine 1, an LNG filling machine calibration device 2 and an LNG gas storage tank 3 connected in sequence, and the LNG filling machine calibration device 2 includes a calibration mass flow meter, that is, the calibration mass flow meter is arranged between the pipelines connecting the LNG filling machine 1 and the LNG gas storage tank 3, and is used to detect the cumulative mass flow value in the pipeline; a mass sensor 31 is installed in the LNG gas storage tank 3, and is used to detect the cumulative mass flow value of the LNG gas storage tank 3. In this way, by recording the cumulative mass flow value output by the calibration mass flow meter and the cumulative mass flow value output by the high-precision mass sensor at the same time, and comparing the two, the error of the LNG filling machine calibration device can be determined.

[0017] As a preferred embodiment of the calibration system for the LNG filling machine calibration device of this embodiment, the calibration mass flow meter 21 and the mass sensor 31 are connected to the data processing center 4 to transmit the detected data to the data processing center, and the data processing center 4 determines the accuracy of the LNG filling machine calibration device according to the cumulative mass flow value detected by the calibration mass flow meter and the high-precision mass sensor. In this way, the accuracy and repeatability of the LNG filling machine calibration device can be automatically detected and determined by the data processing center 4.

[0018] Specifically, the LNG filling machine 1 includes a gas filling pipeline and a filling return gas pipeline; a liquid mass flowmeter 11 is arranged in the gas filling pipeline, and a liquid filling gun 12 is installed at the outlet end of the gas filling pipeline; in the gas filling pipeline, a pneumatic valve 13 is arranged between the liquid filling gun 12 and the liquid mass flowmeter 11, 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.

[0019] The LNG filling machine calibration device 2 also includes a calibration liquid adding pipeline and a calibration return air pipeline; the calibration mass flowmeter includes a liquid phase calibration mass flowmeter 21 and a gas phase calibration mass flowmeter 22; 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 calibration device and the LNG filling machine are connected in series. The liquid phase calibration mass flowmeter 21 and the gas phase calibration mass flowmeter 22 are collectively referred to as calibration mass flowmeters.

[0020] In addition, the LNG filling machine 1 also includes an electronic control and display system 16, which is connected to the liquid mass flowmeter 11 and the gas mass flowmeter 14 to display the detected data; the electronic control and display system is also connected to the pneumatic valve 13 to control the operation of the pneumatic valve.

[0021] Accordingly, based on the above-mentioned calibration system for the LNG filling machine calibration device, this embodiment also provides a calibration method for the LNG filling machine calibration device, comprising the following steps:

[0022] (1) According to Figure 1 Connect the LNG filling machine, LNG filling machine verification device and LNG gas storage tank, and check the sealing of the pipeline;

[0023] (2) Starting the LNG filling machine, the LNG filling machine verification device and the LNG gas storage tank to perform a circulating precooling process, and the cooling liquid flows through the LNG filling machine, the LNG filling machine verification device and the LNG gas storage tank for precooling;

[0024] (3) During the pre-cooling cycle, observe the cooling liquid state parameters displayed by the monitoring system of the LNG filling machine verification device. When the test conditions are met, adjust the circulation flow of the LNG filling machine 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;

[0025] (4) After the fluid state is stable, synchronously collect the flow of the LNG calibration device and the quality signal of the tank equipment with high-precision mass sensor, record the cumulative mass flow value output by the calibration mass flow meter within one minute (the value detected by the liquid phase calibration mass flow meter - the value detected by the gas phase calibration mass flow meter) and the cumulative mass flow value output by the mass sensor, and compare the two to determine the error of the LNG filling machine calibration device. If the error is within the standard range, the LNG filling machine calibration device can be calibrated. If the error is outside the standard range, it means that the LNG filling machine calibration device is unqualified and needs to be replaced; repeat the above operation, measure and calculate the repeatability multiple times, and then determine the accuracy level of the LNG filling machine calibration device. When the filling machine is subsequently calibrated by the LNG filling machine calibration device, error correction is used, that is, the LNG filling machine calibration device can be calibrated.

[0026] In summary, the utility model connects an LNG filling machine, an LNG filling machine calibration device, and an LNG gas storage tank with a high-precision mass sensor in series, uses the LNG gas storage tank with a high-precision mass sensor as a main standard, and detects the accuracy and repeatability of the LNG filling machine measurement and calibration device through the filling process, thereby achieving traceability of the ship-borne LNG filling machine calibration device.

[0027] The purpose of the utility model is to solve the problem that there is no traceability method and system for the LNG filling machine calibration device, and proposes a real-flow calibration system of the mass calibration method to calibrate the LNG filling machine calibration device. It is conducive to solving the problem of metrological calibration guarantee in the field of ship LNG filling, providing accurate metrological services for port LNG filling companies and LNG filling machine calibration device manufacturers, and maintaining the metrological fairness of ship LNG filling. On the one hand, according to conservative estimates, if the total cost of ship LNG filling is 100 billion yuan per year, every 1% increase in measurement accuracy is enough to reduce cost losses of more than 1 billion yuan; on the other hand, through the innovation of metrological calibration technology, the efficiency of metrological calibration can be greatly improved and costs can be saved. The utility model can be used to carry out LNG filling machine calibration while calibrating the LNG filling machine calibration device.

[0028] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.

Claims

1. A calibration system for a LNG filling machine verification device, characterized in that: It comprises an LNG filling machine, an LNG filling machine calibration device and an LNG gas storage tank which are connected in sequence; the LNG filling machine calibration device comprises a calibration mass flow meter for detecting the cumulative mass flow value in the pipeline; a mass sensor is installed in the LNG gas storage tank as a main standard for detecting the cumulative mass flow value of the LNG gas storage tank.

2. The calibration system for the LNG filling machine verification device according to claim 1, characterized in that: The calibration mass flow meter and the quality sensor are connected to the data processing center to transmit the detected data to the data processing center, and the data processing center determines the accuracy of the LNG filling machine calibration device according to the cumulative mass flow value detected by the calibration mass flow meter and the quality sensor.

3. The calibration system for the LNG filling machine verification device according to claim 1, characterized in that: The LNG filling machine includes a gas filling pipeline and a filling return gas pipeline; a liquid mass flowmeter is arranged in the gas filling pipeline, and a liquid filling gun is installed at the outlet end of the gas filling pipeline; in the gas filling pipeline, a pneumatic valve is arranged between the liquid filling gun and the liquid mass flowmeter; a gas mass flowmeter is arranged in the return gas pipeline, and a return gas gun is installed at the inlet end of the return gas pipe.

4. The calibration system for the LNG filling machine verification device according to claim 3, characterized in that: The LNG filling machine calibration device also includes a calibration liquid adding pipeline and a calibration return air 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 return air pipeline, and the outlet end of the calibration return air pipeline serves as a return air port to be connected to a return air gun.

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