CN212030697U - Online calibrating device of hydrogenation machine measurement performance - Google Patents

Abstract

The utility model discloses an on-line calibration device for the measurement performance of a hydrogenation machine, comprising a hydrogenation machine, a static mass method device, a data acquisition and processing mechanism, and the hydrogenation machine comprises a display screen, an intake valve group, a pressure gauge, Mass flow meter, the intake valve group is connected with the gas source, and the intake valve group, the pressure gauge and the mass flow meter are connected in sequence. The measurement principle of the utility model is based on the law of mass conservation, and the electronic scale is used as the measurement standard, which makes it possible to directly trace the flow value of the hydrogenation machine to the mass value of the electronic scale; The standard standard table method hydrogenation machine calibration method has the advantages of short traceability chain, less intermediate links, less uncertainty factors, and high measurement accuracy. It can be applied in both laboratory and field applications, while ensuring the convenience of testing. , improve the accuracy of measurement, it is worth promoting vigorously.

Description

An online calibration device for the metering performance of a hydrogenation machine

technical field

The utility model relates to the technical field of hydrogen energy measurement, in particular to an on-line calibration device for the measurement performance of a hydrogenation machine.

Background technique

As a kind of energy, the product of hydrogen oxidation and combustion is only water, and the unit calorific value is high, so the development and utilization of hydrogen energy has been paid more and more attention by the society, and major countries in the world are increasing the development of hydrogen energy. , vigorously develop the hydrogen energy business.

Hydrogenation machine is a special equipment that fills the gas storage container with hydrogen and has devices such as metering and pricing. Including mass flow meter, electronic controller, quick shut-off valve, hydrogen refueling gun, etc. As a measuring instrument for custody transfer, the accuracy of the metering performance of the hydrogen refueling machine has been highly valued by government regulatory authorities and all sectors of society.

After searching, Chinese Patent No. CN110726459A discloses a hydrogenation machine on-site verification device, including a computer, a high-pressure pipeline, a pressure gauge, a solenoid valve, a stop valve, a flow sensor and a flow transmitter. One end of the high-pressure pipeline is provided with a hydrogenation gun The interface and the other end are provided with a gas cylinder interface, and the flow sensor, pressure gauge, solenoid valve and shut-off valve are arranged on the high-pressure pipeline between the hydrogenation gun interface and the gas cylinder interface; the flow sensor is electrically connected to the flow transmitter. Connection, the computer is connected with the signal of the flow transmitter and the hydrogenation amount display module of the hydrogenation machine at the same time. The amount of hydrogen added is compared and analyzed to determine whether the measurement of the hydrogenation machine is accurate.

The calibration method proposed by the above prior art needs to determine the measurement accuracy of the standard flowmeter used. For the traceability of the standard flowmeter, the mass method and the standard meter method are mostly used to trace the source to the upper-level flow standard device. This method has a long traceability chain. There are many factors of uncertainty that may be introduced, and the accuracy of the standard flowmeter used in the field calibration needs to be demonstrated.

Utility model content

The purpose of the utility model is to propose an online calibration device for the metering performance of a hydrogenation machine in order to solve the defects existing in the prior art.

In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

An on-line calibration device for the measurement performance of a hydrogenation machine, comprising a hydrogenation machine, a static mass method device, a data acquisition and processing mechanism, and the hydrogenation machine includes a display screen, an intake valve group, a pressure gauge, and a mass flow meter. The intake valve group is connected to the gas source, the intake valve group, the pressure gauge and the mass flowmeter are connected in sequence, the hydrogenation machine is installed with a hydrogenation gun, and the static mass method device includes a hydrogenation gun connector, Indicating flowmeter, pre-flow regulating valve, pressure sensor, gas cylinder valve group, electronic scale, gas storage cylinder group, the hydrogenation gun is connected with the hydrogenation gun connector through a quick-clamp joint, and the hydrogenation gun connector , indicating flow meter, front flow regulating valve, pressure sensor, gas cylinder valve group, and gas storage cylinder group are connected in sequence, the gas storage cylinder group is placed on the electronic scale, and the data acquisition and processing mechanism includes a computer, a data acquisition with the control board.

Further, the hydrogen refueling gun connector has a variety of quick-clamp joints.

Further, the accuracy level of the indicating flow meter is not lower than 2.5, and the accuracy level of the electronic scale is not lower than III.

Further, the gas cylinder valve group includes 3 valves.

Further, the gas storage cylinder group includes 3 gas storage cylinders.

Further, the computer controls the pre-flow regulating valve and the gas cylinder valve group at the same time, and the computer can realize the reading of the pressure sensor and the electronic scale.

An on-line calibration method for the metering performance of a hydrogenation machine, the method comprising the steps: S1. Distinguish the entire flow range of the hydrogenation machine, and divide it into a low flow area R(3), a middle flow area R(2), a flow rate High zone R(1);

S2. The computer collects or manually records the initial value and end value of the electronic scale for each measurement, and the hydrogenation value displayed on the display screen of the hydrogenation machine, and comprehensively evaluates the measurement performance of the calibrated hydrogenation machine by the comparison method.

Further, in the step S1, in order to achieve the purpose of controlling the flow area during measurement, it is necessary to add hydrogen to the initial pressure of the hydrogen gas storage cylinder group to a predetermined pressure range, and measure each flow area 3 times. .

Compared with the prior art, the beneficial effects of the present utility model are:

The measurement principle of the utility model is based on the law of mass conservation, and the electronic scale is used as the measurement standard, which makes it possible to directly trace the flow value of the hydrogenation machine to the mass value of the electronic scale; The standard standard table method hydrogenation machine calibration method has the advantages of short traceability chain, less intermediate links, less uncertainty factors, and high measurement accuracy. It can be applied in both laboratory and field applications, while ensuring the convenience of testing. , which improves the measurement accuracy and is worth vigorously promoting.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention.

Fig. 1 is the overall structure schematic diagram of the on-line calibration device of a kind of hydrogenation machine metering performance proposed by the utility model;

Fig. 2 is a flow chart of an on-line calibration method for the metering performance of a hydrogenation machine proposed by the utility model.

In the picture: 1 hydrogenation machine, 2 hydrogenation gun, 3 hydrogenation gun connector, 4 indicating flowmeter, 5 front flow regulating valve, 6 pressure sensor, 7 gas cylinder valve group, 8 electronic scale, 9 gas storage cylinder Group, 10 computers, 11 display screens, 12 intake valve groups, 13 pressure gauges, 14 mass flow meters.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation , are constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

Referring to FIG. 1, an online calibration device for the measurement performance of a hydrogenation machine includes a hydrogenation machine 1, a static mass method device, a data acquisition and processing mechanism, and the hydrogenation machine 1 includes a display screen 11, an intake valve group 12, and a pressure gauge. 13. Mass flow meter 14, the intake valve group 12 is connected to the gas source, the intake valve group 12, the pressure gauge 13 and the mass flow meter 14 are connected in sequence, the hydrogenation machine 1 is equipped with a hydrogenation gun 2, and the static mass method device includes Hydrogenation gun connector 3, indicating flow meter 4, pre-flow regulating valve 5, pressure sensor 6, gas cylinder valve group 7, electronic scale 8, gas storage cylinder group 9, hydrogenation gun 2 through quick connector and hydrogenation gun The connector 3 is connected, the hydrogen refueling gun connector 3, the indicating flow meter 4, the front flow regulating valve 5, the pressure sensor 6, the gas cylinder valve group 7, and the gas storage cylinder group 9 are connected in sequence, and the gas storage cylinder group 9 is placed in the electronic device. On the scale 8, the data acquisition and processing mechanism includes a computer 10, a data acquisition and control board.

The data acquisition and control refers to the acquisition of the readings of the electronic scale 8 and the pressure sensor 6 , and the opening and closing control of the pre-flow regulating valve 5 and the gas cylinder valve group 7 .

Further, the hydrogen refueling gun connector 3 is provided with a variety of quick snap joints.

Further, the accuracy level of the indicator flow meter 4 is not lower than 2.5, and the accuracy level of the electronic scale 8 is not lower than III.

Further, the gas cylinder valve group 7 includes 3 valves.

Further, the gas storage cylinder group 9 includes three gas storage cylinders.

The gas storage cylinder is used to store the hydrogen flowing through the hydrogenation machine 1 and the detection pipeline during the verification process. In each test of each flow area, a gas storage cylinder is inflated. When inflating, the pressure in the cylinder should meet the needs of the current detection flow area. .

For a hydrogenation machine with a rated working pressure of 35MPa, when calibrating the low flow area R(3), the initial pressure in the bottle should be (21-22) MPa; when calibrating the middle flow area R(2), it should be The initial pressure in the bottle is (11 ~ 12) MPa; when calibrating the high flow area R(1), the initial pressure in the bottle should be (1 ~ 2) MPa; for a hydrogenation machine with a rated working pressure of 70MPa, When calibrating R(3) in the low flow area, the initial pressure in the bottle should be (55~58) MPa; when calibrating the middle flow area R(2), the initial pressure in the bottle should be (28~31) MPa; When calibrating the high flow area R(1), the initial pressure in the bottle should be (1~3) MPa.

Further, the computer 10 simultaneously controls the pre-flow regulating valve 5 and the gas cylinder valve group 7, and the computer 10 can realize the readings of the pressure sensor 6 and the electronic scale 8.

Referring to Fig. 2, a kind of on-line calibration method of hydrogenation machine metering performance, described method comprises the steps: S1. distinguish the whole hydrogenation machine flow range, be divided into low flow area R (3), flow medium area R ( 2), high flow area R(1);

S2. The computer collects or manually records the initial value and end value of the electronic scale for each measurement, and the hydrogenation value displayed on the display screen of the hydrogenation machine, and comprehensively evaluates the measurement performance of the calibrated hydrogenation machine by the comparison method.

Further, in the step S1, in order to achieve the purpose of controlling the flow area during measurement, it is necessary to add hydrogen to the initial pressure of the hydrogen gas storage cylinder group to a predetermined pressure range, and measure each flow area 3 times. .

Said method uses an electronic scale as a measurement standard for measurement, and the mathematical expression of the measurement principle involved is:

E _{Hydrogenerator} = m _{indication value} - (m _end - m _initial )

Among them, E _{hydrogenation machine} is the absolute indication error of the hydrogenation machine in one measurement, m _{indication value is} the hydrogenation value displayed by the display device of the hydrogenation machine in a measurement, m _termination is the termination after the electronic weighing hydrogenation value, m is _initially the indicated value of the electronic scale before hydrogenation.

The detailed steps of the calibration method are as follows:

Step 1: Detect the low flow area R(3); after proving that the detection pipeline is airtight, open the front flow regulating valve 5 and the gas cylinder valve group 7 through the computer 10 and the data acquisition and control board. One, open the hydrogenation machine 1, open the gas source, inflate the gas storage cylinder, observe the pressure indicator of the gas storage cylinder, when it reaches (21-22) MPa, close all valves, stop the hydrogenation machine, and stop the inflation; hydrogenation machine 1 is cleared, and the current value of the electronic scale 8 is recorded as the _initial m;

Step 2: Open the pre-flow regulating valve 5 and the automatic valve in the above process again, open the hydrogenation machine 1, open the gas source, and inflate the above-mentioned gas storage cylinder. When the gas storage cylinder pressure indicating device reaches (34-35 ) MPa, close all valves, stop the hydrogenation machine, and stop charging; at the same time, the reading of the display 11 of the hydrogenation machine is read manually or by a computer, and the indication m of the electronic scale 8 is _terminated ;

Step 3: Compare the reading displayed on the display 11 of the hydrogenation machine with the difference before and after the hydrogenation of the electronic weighing scale, and obtain the absolute error of the indication value of the hydrogenation machine verified once in the low flow area R(3);

Step 4: Replace the gas storage cylinder of the hydrogen gas storage cylinder group 9, repeat steps 1 to 3 twice, and take the average value of 3 measurements as the absolute error of the indication value in the low flow area R(3);

Step 5: Perform error measurement on the middle flow area R(2) and the high flow area R(1); repeat steps 1 to 4, but pay attention to the initial pressure value of the gas cylinder when measuring the middle flow area R(2) It should be (11-12) MPa; when measuring the high flow area R(1), the initial pressure of the gas cylinder is (1-2) MPa.

So far, the indication error of each flow area of the hydrogenation machine 1 has been detected. It is worth noting that in the high, medium and low flow area specified in the above embodiment, the initial pressure value of the gas storage cylinder needs to be determined according to the rated working pressure of the hydrogenation machine. At present, the rated working pressure of domestic mainstream hydrogenation machines is 35MPa and 70MPa. For the 70MPa hydrogenation machine, it is recommended that the initial pressure values of the gas storage cylinder are (1~3) MPa, (28~31) MPa, (55~58) MPa when performing measurement performance verification in the high, medium and low flow area.

Compared with the prior art, the beneficial effects of the present utility model are:

(1) The device has a simple structure and is easy to use, and is suitable for on-site calibration and laboratory calibration of hydrogenation machines;

(2) The electronic scale is used as the measurement standard, so that the flow value can be directly traced to the quality value, the traceability chain is short, the uncertainty factors are few, and the accuracy is high;

(3) The hydrogen refueling machine can be fully inspected from the high flow area to the low flow area, and the metering performance evaluation of the inspected tanker can be more comprehensive.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (6)

1. An on-line calibration device for the metering performance of a hydrogenation machine comprises the hydrogenation machine (1), a static mass method device and a data acquisition and processing mechanism, wherein the hydrogenation machine (1) comprises a display screen (11), an air inlet valve group (12), a pressure gauge (13) and a mass flow meter (14), the air inlet valve group (12) is connected with an air source, the air inlet valve group (12), the pressure gauge (13) and the mass flow meter (14) are sequentially connected, and the hydrogenation machine (1) is provided with a hydrogenation gun (2), and the on-line calibration device is characterized in that the static mass method device comprises a hydrogenation gun connector (3), an indication flow meter (4), a front flow control valve (5), a pressure sensor (6), an air cylinder valve group (7), an electronic scale (8) and an air storage cylinder group (9), wherein the hydrogenation gun (2) is connected with the hydrogenation gun connector (3) through a quick connector, the device is characterized in that the hydrogenation gun connector (3), the indicating flow meter (4), the front flow regulating valve (5), the pressure sensor (6), the gas cylinder valve group (7) and the gas storage cylinder group (9) are sequentially connected, the gas storage cylinder group (9) is placed on the electronic scale (8), and the data acquisition and processing mechanism comprises a computer (10) and a data acquisition and control board card.

2. The on-line calibration device for the metering performance of the hydrogenation machine according to claim 1, wherein the hydrogenation gun connector (3) is provided with a plurality of quick-release connectors.

3. The on-line calibrating device for the metering performance of the hydrogenation machine according to claim 1, wherein the accuracy grade of the indicating flowmeter (4) is not lower than 2.5 grade, and the accuracy grade of the electronic scale (8) is not lower than III grade.

4. An on-line calibration device for the metering performance of a hydrogenation machine according to claim 1, characterized in that the gas cylinder valve group (7) comprises 3 valves.

5. An on-line calibration device for the metering performance of a hydrogenation unit as claimed in claim 1, wherein said gas cylinder group (9) comprises 3 gas cylinders.

6. The on-line calibrating device for the metering performance of the hydrogenation machine according to claim 1, wherein the computer (10) controls the preposed flow regulating valve (5) and the gas cylinder valve group (7) simultaneously, and the computer (10) can realize the reading of the pressure sensor (6) and the electronic scale (8).

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