Online traceability calibrating device for compressed hydrogen dispenser quantity value standard meter

Abstract

The utility model discloses an online traceability calibrating device for a compressed hydrogen dispenser quantity value standard meter. A filling port is respectively connected with a gas outlet (19), a diffusion port (20) and a gas return port (21) through pipelines; a pressure sensor (10), a temperature sensor (12) and a mass flow meter (13) are connected in parallel in the pipeline at the same time and are connected to a digital acquisition board (9); the digital acquisition board (9) is simultaneously connected to the notebook computer (6) and the power supply (7); and a hydrogen leakage alarm (14) is arranged beside the digital acquisition board (9). The device is simple in structure, easy to be equipped with an automatic control system, capable of realizing remote operation and data monitoring, capable of automatically collecting and calculating data in the verification process, capable of carrying out field verification on the metering performance of the compressed hydrogen dispenser and capable of improving the metering accuracy of verification. The metering accuracy of a standard device of a standard meter method is superior to 0.8%; the pressure grade is 35 Mpa; the flow range is 0 to 3.6 kg / min; the explosion-proof grade is more than Ex d IIC T4, and the device is suitable for a hydrogen coupling area; and the working power supply is 220V AC (Alternating Current).

Description

Technical Field

[0001] The utility model belongs to the special application technical field of indicating, metering or monitoring devices in the operation of filling or discharging compressed, liquefied or solidified gas into a container or from a container in IPC classification F17C13 / 02, and in particular relates to a calibration device suitable for a compressed hydrogen filling machine, which performs online traceability of the mass flow of the compressed hydrogen filling machine. Background Art

[0002] As the basic infrastructure for supplying hydrogen to fuel cell vehicles, hydrogen refueling stations are mainly composed of hydrogen production systems, compression systems, storage systems, filling systems and control systems. As an important part of hydrogen stations, hydrogen refueling machines are responsible for the test filling of hydrogen fuel cell vehicles, filling and testing of on-board hydrogen storage systems, etc.

[0003] The compressed hydrogen calibration device is a professional tool used to verify and calibrate the accuracy of compressed hydrogen metering equipment. The mass method hydrogen filling machine metering accuracy test method is specified in the "GB / T 31138-2014 Compressed Hydrogen Refueling Machine for Automobiles" standard. According to the metering requirements, the hydrogen refueling machine should be subject to mandatory calibration during the hydrogen filling process.

[0004] The corresponding technology is less disclosed. Patent application 202121087746.2 discloses a standard table method compressed hydrogen filling machine calibration device, including a large-flow filling port, a hydrogen flowmeter, a large-flow hydrogen filling gun and an electronically controlled explosion-proof box; the large-flow filling port is connected to the air inlet end of the hydrogen flowmeter through a large-flow filling port valve; the air outlet end of the hydrogen flowmeter is connected to the air inlet end of the large-flow hydrogen filling gun through a large-flow outlet valve, and is connected to the vent through a vent valve; the air outlet end of the hydrogen flowmeter is also connected to a pressure transmitter; the exhaust line of the large-flow hydrogen filling gun is also connected to the vent; the electronically controlled explosion-proof box collects the flow signal of the hydrogen flowmeter and sends it to the terminal computer.

[0005] Patent application 201920026719.0 discloses a calibration device for calibrating compressed hydrogen filling machines, including an air inlet, a valve, a pressure gauge, a pressure transmitter, a mass flow meter, a communication module, a wireless module, a data collector, a power supply, a touch-type industrial computer and an air outlet; the air inlet, the valve, the mass flow meter and the air outlet are connected in sequence through pipelines; a pressure gauge and a pressure transmitter are provided on the pipeline between the valve and the mass flow meter; the pressure transmitter and the mass flow meter are both communicatively connected to the communication module; the communication module is communicatively connected to the wireless module and the data collector respectively; the data collector is communicatively connected to the touch-type industrial computer; the power supply is used to power the entire device.

[0006] At present, most of the existing compressed hydrogen calibration devices use the weighing method for traceability. The calibration device has a single function and the system integration is not high. In addition, the equipment is large and the process flow is complicated. In order to improve efficiency and reduce the workload of calibration personnel, it is necessary to explore the selection of standard table methods for traceability calibration of hydrogen filling machines. However, there is no public standard calibration device for compressed hydrogen filling machine value quality method that can be calibrated on site. Utility Model Content

[0007] The technical problem to be solved by the utility model is that in response to the above problems and technical requirements, the utility model proposes an online traceability calibration device for a compressed hydrogen filling machine value standard table to ensure accurate hydrogen metering, compact structure, high integration, safe and convenient operation, thereby ensuring fairness and accuracy in industrial production and energy trading.

[0008] To this end, the utility model includes: a filling port, a laptop computer, a power supply, a digital acquisition board, a pressure sensor, a temperature sensor, a mass flow meter, a hydrogen leakage alarm, an air outlet, a venting port and a return air port. The filling port is connected to the air outlet, the venting port and the return air port through pipelines; the pipelines are connected to the digital acquisition board through pressure sensors, temperature sensors and mass flow meters in parallel; the digital acquisition board is further connected to the laptop computer and the power supply at the same time, and a hydrogen leakage alarm is installed next to the digital acquisition board.

[0009] The filling port, digital acquisition board, pressure sensor, temperature measuring and controlling instrument, mass flow meter, hydrogen leakage alarm, gas outlet, vent and return port are integrated and installed in an explosion-proof junction box. The digital acquisition board is installed in the explosion-proof junction box. The filling port, gas outlet, vent and return port are connected to the hydrogenation hose by threaded seal; the return port and the vent are connected by a quick connector. The mass flow meter is connected to the gas outlet, vent and return port through three parallel pipelines; the first pipeline is connected to the gas outlet through the third check ball valve, the second pipeline is connected to the vent through the pressure relief valve, and the third pipeline is connected to the return port through the fourth check ball valve and the one-way valve. Moreover, the third pipeline between the fourth check ball valve and the one-way valve is connected to the bypass pipeline and connected to the second pipeline between the pressure relief valve and the vent.

[0010] A pressure reducing valve is connected to the pipeline between the pressure sensor and the temperature sensor.

[0011] The filling port includes at least one large filling port and at least one small filling port. The large filling port and the small filling port are connected to the pipeline through a first check ball valve and a second check ball valve respectively.

[0012] The pressure transmitters are respectively installed on the pipelines on both sides of the filling port and the mass flow meter, and a temperature sensor is installed at the rear stage of the mass flow meter.

[0013] Furthermore, to achieve the above purpose, the utility model is configured as follows: a remote communication device is installed next to the digital acquisition board; at the same time, pressure transmitters are installed on the pipelines on both sides of the filling port and the mass flow meter, and a temperature sensor is installed at the rear stage of the mass flow meter.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1) High-precision measurement: The device uses advanced sensing technology and precise measuring instruments to ensure accurate measurement of key parameters such as hydrogen flow and pressure.

[0016] 2) Multifunctional integration: Modern compressed hydrogen calibration devices often integrate multiple measurement and calibration functions and can adapt to hydrogen metering equipment of different models and specifications.

[0017] 3) Automation and intelligence: It is easy to equip with an automated control system to reduce errors caused by human factors, enable remote operation and data monitoring, and make the operation process simple and convenient, thereby improving work efficiency and safety.

[0018] 4) Reliability and stability: These devices are designed and manufactured to strict standards and can maintain stable performance under various environmental conditions.

[0019] 5) Online work and on-site calibration: Automatically collect data and calculate during the calibration process, and can perform on-site calibration of the metering performance of the compressed hydrogen filling machine to improve the metering accuracy of the calibration.

[0020] 6) Compact structure and high integration: simple structure, high integration, small structure, easy installation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings are for illustration only and should not be construed as limiting the present invention in any way. By referring to the following drawings, readers can understand the embodiments of the present invention and further understand the advantages and technical features of the present invention.

[0022] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the calibration process of the hydrogen filling machine in the embodiment of the utility model.

[0024] Reference numerals include:

[0025] 1-hydrogen filling machine, 2-large filling port, 3-small filling port, 4-first check ball valve, 5-second check ball valve, 6-laptop computer, 7-power supply, 8-explosion-proof junction box, 9-digital acquisition board, 10-pressure sensor, 11-pressure reducing valve, 12-temperature sensor, 13-mass flow meter, 14-hydrogen leak alarm, 15-third check ball valve, 16-pressure relief valve, 17-fourth check ball valve, 18-one-way valve, 19-air outlet, 20-vent, 21-return air outlet, 22-vehicle cylinder. DETAILED DESCRIPTION

[0026] It should be noted that:

[0027] The terms "comprise", "comprises", "having" and any variations thereof are intended to cover other possible options under the same logic that are not listed. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatus.

[0028] In the description of the present utility model, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In order to enable those skilled in the art to better understand the scheme of the utility model, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only an embodiment of a part of the utility model, rather than all the embodiments.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by ordinary technicians in the field to which the utility model belongs. When there is a conflict, the definitions in this specification shall prevail.

[0032] Measuring standard devices can generally be made by weighing method and standard table method. Among them, the static weighing method directly reads the mass, and the error mainly comes from the electronic balance. The electronic balance has a high accuracy level, and is often easily restricted and affected by objective conditions during on-site verification, and the operation is relatively complicated. The standard table method metrological standard device is a device that uses a standard flow device as the main standard. It uses the continuity principle of fluid mechanics to connect the standard flow device and the flow device to be tested in series on a pipe of the same diameter, so that the fluid passes through the standard flow device and the flow device to be tested continuously at the same time interval. The standard flow device and the relevant parameter measuring instrument give a standard flow value, which is compared with the flow value output by the flow device to be tested, so as to determine the technical indicators of the flow device to be tested. Compared with the flow measurement standard device using other methods, the standard table method flow measurement standard device has the advantages of simple structure, convenient operation, high work efficiency, easy automation, easy transportation, relatively low cost and short construction period, and can give a wider flow range, which is particularly suitable for on-site verification of flow meters and flow standard devices, which is incomparable to the flow measurement standard device using other methods.

[0033] In the chemical and energy industries, ensuring the accuracy of hydrogen metering is crucial for production process control and cost accounting. When hydrogen is traded as an energy source, accurate metering is the basis for fair trading. As a flammable and explosive gas, accurate metering and monitoring of hydrogen are of great significance to ensuring industrial safety.

[0034] In the utility model, a traceability method for verification and calibration of hydrogenation machines is studied, and an on-site calibration device for hydrogenation machines is developed. The standard table method can be used to realize rapid on-site traceability of the measurement value of hydrogenation machines. The technical independence of on-site traceability of the measurement value of hydrogenation machines can be realized within Sinopec, and the corresponding technical basis is provided for the metrological traceability verification procedures of the quality method and the standard table method.

[0035] The principle of the utility model is to study the arrangement and connection relationship of the necessary structural components in the device:

[0036] 1) Sensors and transmitters: monitor hydrogen flow and pressure parameters in real time and transmit data to the control system.

[0037] 2) Control system: A PLC or microprocessor-based system that receives sensor data and performs calculations and control operations.

[0038] 3) Calibration device: including standard table and calibrator, used to calibrate and adjust hydrogen metering equipment.

[0039] 4) Communication interface: allows the device to exchange data with other systems or equipment to achieve remote monitoring and management.

[0040] The utility model comprises: a filling port, a laptop computer 6, a power supply 7, a digital acquisition board 9, a pressure sensor 10, a temperature sensor 12, a mass flow meter 13, a hydrogen leakage alarm 14, an air outlet 19, a venting port 20 and an air return port 21.

[0041] The utility model is applicable to the on-site calibration method and workflow of compressed hydrogen filling machines, and realizes the traceability of online calibration values ​​of hydrogen filling machines working in Sinopec hydrogen filling stations. The main technical indicators include: the measurement accuracy of the standard meter method standard device is better than 0.8%; the pressure level is 35Mpa; the flow range is 0-3.6kg / min; the explosion-proof level is Ex d IIC T4 or above, suitable for areas where hydrogen occasionally exists; the working power supply is 220V AC.

[0042] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0043] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

[0044] The content of the present invention can be more easily understood by selecting the following preferred implementation methods and embodiments of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by ordinary technicians in the field to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0045] Embodiment 1: As attached Figure 1 As shown, the filling port is connected to the air outlet 19, the venting port 20 and the air return port 21 through pipelines; in the pipeline, they are connected in parallel to the digital acquisition board 9 through the pressure sensor 10, the temperature sensor 12 and the mass flow meter 13; further, the digital acquisition board 9 is connected to the laptop computer 6 and the power supply 7 at the same time, and a hydrogen leakage alarm 14 is installed next to the digital acquisition board 9.

[0046] In the above, the filling port, the digital acquisition board 9, the pressure sensor 10, the temperature measuring and controlling instrument 12, the mass flow meter 13, the hydrogen leakage alarm 14, the gas outlet 19, the venting port 20 and the gas return port 21 are integrated and installed.

[0047] In the foregoing, the digital acquisition board 9 is installed in the explosion-proof junction box 8 .

[0048] In the foregoing, the filling port includes at least one large filling port 2 and at least one small filling port 3. Further, the large filling port 2 and the small filling port 3 are connected to the pipeline through the first check ball valve 4 and the second check ball valve 5 respectively.

[0049] In the above description, the pressure reducing valve 11 is connected to the pipeline between the pressure sensor 10 and the temperature sensor 12 .

[0050] In the above, the mass flow meter 13 is connected to the gas outlet 19, the vent 20 and the return port 21 through three parallel pipelines, wherein the first pipeline is connected to the gas outlet 19 through the third check ball valve 15, the second pipeline is connected to the vent 20 through the pressure relief valve 16, and the third pipeline is connected to the return port 21 through the fourth check ball valve 17 and the one-way valve 18. Moreover, the third pipeline between the fourth check ball valve 17 and the one-way valve 18 is connected to the bypass pipeline and connected to the second pipeline between the pressure relief valve 16 and the vent 20. When the pressure is too high, the intake pressure is relieved and silenced, and the pressure reducing valve 11 of the previous stage plays a dual protection role.

[0051] Preferably, the mass flowmeter 13 is equipped with a high-precision mass flowmeter as a standard to trace the measurement of the hydrogenator 1. At the same time, a high-precision pressure sensor 10 is configured to monitor the pressure of the hydrogenator 1. A high-precision temperature sensor 12 is configured to monitor the hydrogen temperature of the hydrogenator 1. The pressure relief valve 16 is activated when the pressure exceeds the limit, and hydrogen is discharged from the vent 20. A high-sensitivity hydrogen leakage alarm 14 is configured to promptly alarm when hydrogen leakage occurs to prevent the occurrence of safety accidents.

[0052] Preferably, the pressure relief valve 16 is equipped with a dedicated electrostatic grounding clamp to ensure reliable grounding to prevent danger caused by static electricity.

[0053] In the embodiment of the utility model, the large filling port 2, the small filling port 3, the gas outlet 19, the venting port 20, and the return port 21 are connected to the hydrogenation hose using 74-degree threaded seals to ensure reliable sealing while increasing safety. Among them, the return port 21 and the venting port 20 are connected with a quick connector to improve the convenience of use of the device.

[0054] In the embodiment of the utility model, the on-line calibration device of the compressed hydrogen filling machine using the standard meter method is used to carry out on-site calibration of the hydrogen filling station. First, the filling port of the hydrogen filling machine standard meter calibration device should be connected to the hydrogen filling machine 1, the gas outlet 19 should be connected to the vehicle-mounted steel cylinder 22, and the gas return port 21 should be connected to the discharge pipeline in the hydrogen filling machine 1 station. The hydrogen in the device pipeline should be replaced more than 5 times to completely replace the nitrogen in the pipeline with hydrogen to ensure the hydrogen quality of the hydrogen filling vehicle.

[0055] In the embodiment of the utility model, the large filling port 2 and the small filling port 3 can be connected to the TK16 and TK25 hydrogenation guns of the hydrogenation machine 1 respectively, and the explosion-proof junction box 8 uses a 300X300 explosion-proof box, and the product explosion-proof grade is: ExdeIICT6 Gb. The temperature sensor 12 uses a built-in temperature sensor, and the sensor temperature measuring rod is directly in contact with the hydrogen. The direct measurement method can obtain a more accurate temperature; the pressure sensor 10 uses a 0--60MPa pressure grade sensor; the two sensors use explosion-proof 0.5 grade precision hydrogen measurement special sensors.

[0056] In the embodiment of the utility model, the accuracy of the mass flow meter 13 is selected according to the highest water mark 0.15 level in accordance with the JJG1038-2008 Coriolis mass flow meter calibration procedure. The mass flow meter 13 interface adopts a high-pressure series connector, and the specific specification is a cone-sealed UNF13 / 16-16 internal thread; the matching Tube specification is 9 / 16, and the bottom of the connector thread of the mass flow meter 13 is equipped with an exhaust port to ensure construction safety. When a small amount of residual gas is not discharged during the disassembly and assembly of the flow meter, the residual gas is discharged from the exhaust port when the connector is disassembled, thereby ensuring the safety of the operators. The hydrogen leak alarm 14 uses the GT-S101 hydrogen leak alarm produced by Zhongan Detection; the instrument can meet the sound and light alarm prompts at the hydrogen detection site, and display the gas concentration at the control site in real time, and has three-proof design, networked control and other functions.

[0057] In the embodiment of the utility model, the calibration operation process is as shown in the attached Figure 2 As shown:

[0058] A) Start the test;

[0059] B) Connect the hydrogenator and the calibration device in series and turn on the power;

[0060] C) Connect the calibration device to the computer via RS485 to RS232 connector;

[0061] D) Clear the cumulative operation of the calibration device;

[0062] E) Start the hydrogenation machine, and the gas source passes through the calibration device and is added to the on-board cylinder;

[0063] F) Stop refueling, and stop the hydrogenation machine and the calibration device;

[0064] G) Input data in the main interface of verification, calculate error and save data;

[0065] H) Determine whether the verification times have been reached; if not, go to step D; if yes, go to step I;

[0066] I) Calculate the error and repeatability of this gun and save the data;

[0067] J) Check the data records to confirm whether the verification is qualified;

[0068] K) End the test.

[0069] As an extension and improvement of the embodiment of the utility model, a remote communication device is installed next to the digital acquisition board 9; at the same time, a pressure transmitter is installed on the pipelines on both sides of the filling port and the mass flow meter 13, and a temperature sensor 12 is installed at the back of the mass flow meter 13, which can be used to perform pressure alarms on the one hand and collect pressure and temperature data during the calibration process on the other hand, and to correct the data source for later data processing. Data is exchanged with other systems or devices to achieve remote monitoring and management.

[0070] Based on the above embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention, so as to avoid exhaustively listing all implementation methods that are unnecessary and impossible to list comprehensively.

Claims

1. An online traceability verification device for a standard table of compressed hydrogen filling machine, comprising a filling port, a laptop computer (6), a power supply (7), a digital acquisition board (9), a pressure sensor (10), a temperature sensor (12), a mass flow meter (13), a hydrogen leakage alarm (14), an air outlet (19), a venting port (20) and an air return port (21); characterized in that: The filling port is connected to the gas outlet (19), the venting port (20) and the gas return port (21) through pipelines; the pipelines are connected in parallel to the digital acquisition board (9) through a pressure sensor (10), a temperature sensor (12) and a mass flow meter (13); the digital acquisition board (9) is connected to a laptop computer (6) and a power supply (7) at the same time, and a hydrogen leakage alarm (14) is installed next to the digital acquisition board (9).

2. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: The filling port, the digital acquisition board (9), the pressure sensor (10), the temperature sensor (12), the mass flow meter (13), the hydrogen leakage alarm (14), the air outlet (19), the venting port (20) and the air return port (21) are integrated and installed in the explosion-proof junction box (8).

3. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: The digital acquisition board (9) is installed in the explosion-proof junction box (8).

4. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: The filling port comprises at least one large filling port (2) and at least one small filling port (3).

5. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: A pressure reducing valve (11) is connected to the pipeline between the pressure sensor (10) and the temperature sensor (12).

6. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: The mass flow meter (13) is connected to the gas outlet (19), the vent (20) and the gas return port (21) through three parallel pipelines, wherein the first pipeline is connected to the gas outlet (19) through the third check ball valve (15), the second pipeline is connected to the vent (20) through the pressure relief valve (16), and the third pipeline is connected to the gas return port (21) through the fourth check ball valve (17) and the one-way valve (18), and the third pipeline between the fourth check ball valve (17) and the one-way valve (18) is connected to the bypass pipeline and connected to the second pipeline between the pressure relief valve (16) and the vent (20).

7. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: The filling port, the gas outlet (19), the venting port (20), and the gas return port (21) are connected to the hydrogenation hose by using 74-degree threaded seals; the gas return port (21) and the venting port (20) are connected by a quick connector.

8. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: Pressure transmitters are respectively installed on pipelines on both sides of the filling port and the mass flow meter (13), and a temperature sensor (12) is installed at the rear stage of the mass flow meter (13).

9. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 1 is characterized in that: A remote communication device is installed next to the digital acquisition board (9); at the same time, pressure transmitters are installed on the pipelines on both sides of the filling port and the mass flow meter (13), and a temperature sensor (12) is installed at the rear stage of the mass flow meter (13).

10. The online traceability verification device for the value standard table of compressed hydrogen filling machine according to claim 4 is characterized in that: The large filling port (2) and the small filling port (3) are connected to the pipeline via a first check ball valve (4) and a second check ball valve (5) respectively.

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