CN-224231055-U - Calibration system for gas flow metering

Abstract

The utility model discloses a gas flow metering calibration system which comprises a gas source part, an experimental pipe section, a sonic nozzle group and a controller. The utility model is used for calibrating and calibrating the gas flow measurement, and the mass flow of the gas is only related to the upstream pressure and temperature and is irrelevant to the downstream environment, so that the utility model has no influence caused by downstream measurement errors, has high measurement precision, has simple structure, is not easily influenced by the environment and is convenient to maintain. The utility model can meet the measurement requirements under different working conditions and has wide application range. Furthermore, the utility model can get rid of the limit of the volume scale and the performance of the measuring device, and the sonic nozzle can be directly applied to the calibration and the calibration of the hydrogen field real flow.

Inventors

• CAO PEIJUAN
• GUO CHAOPENG
• SUN JUNYING
• WANG YANHONG

Assignees

• 河北师范大学

Dates

Publication Date

20260512

Application Date

20250716

Claims (7)

1. 1. The calibrating system for gas flow measurement is characterized by comprising a gas source part, an experimental pipe section, a sonic nozzle group and a controller; The air source part comprises an air storage tank and an automatic pressure controller, and the air storage tank is communicated with the automatic pressure controller through a flange plate and a connecting pipe section; The experimental pipe section comprises a first detected flowmeter pipeline, a second detected flowmeter pipeline, a detected meter, an upstream pressure meter, an upstream hygrothermograph, a downstream pressure meter and a downstream hygrothermograph, wherein the inlet end of the detected meter is connected with the automatic pressure controller through the first detected flowmeter pipeline, and the outlet end of the detected meter is connected with one end of the second detected flowmeter pipeline; The system comprises a sonic nozzle group, a sonic nozzle group upstream pressure gauge, a sonic nozzle group downstream pressure gauge, a sonic nozzle group hygrothermograph, an upstream electric valve and a downstream electric valve, wherein the inlet of the upstream electric valve and the sonic nozzle group is communicated through an upstream pipeline, the outlet of the sonic nozzle is communicated with the downstream electric valve through a downstream pipeline, the sonic nozzle group upstream pressure gauge and the sonic nozzle group downstream pressure gauge are respectively connected with the upstream pipeline and the downstream pipeline, the sonic nozzle group hygrothermograph is connected with the upstream pipeline, the upstream electric valve is connected with a detected flowmeter pipeline II, the controller is connected with each upstream electric valve and the downstream electric valve in a control manner; The automatic pressure controller, the inspected meter, the upstream pressure meter, the upstream hygrothermograph, the downstream pressure meter, the downstream hygrothermograph, the sonic nozzle group upstream pressure meter, the sonic nozzle group downstream pressure meter, the sonic nozzle group hygrothermograph, the upstream electric valve and the downstream electric valve are all in communication connection with the controller.
2. 2. The calibration system of claim 1, wherein the air reservoir is made of 316L stainless steel and an inner wall of the air reservoir is covered with an anti-corrosive coating.
3. 3. The system of claim 1, wherein the upstream hygrothermograph and the upstream manometer and the downstream hygrothermograph are not on the same horizontal plane, and wherein the included angle between the faces is 90 °.
4. 4. The calibration system of claim 1, wherein the outlet header line is connected to a muffler or a gas recovery device.
5. 5. The calibration system of claim 1, wherein the sonic nozzle set upstream manometer is mounted at a distance of 0.9D-1.1D from the inlet plane of the sonic nozzle, and the sonic nozzle set hygrothermograph is mounted at a distance of 1.8D-2.2D from the inlet plane of the sonic nozzle, 1.0D being 50mm.
6. 6. The calibration system of claim 1, wherein the sonic nozzle set hygrothermograph and the sonic nozzle set upstream manometer are not on the same horizontal plane, and are at a 90 ° angle.
7. 7. The calibration system of claim 1, wherein the connection pipe section, the first flow meter line under test, the second flow meter line under test, the upstream line, the downstream line, the inlet manifold, and the outlet manifold are 316L stainless steel pipes of DN50 type, wherein the inner diameter D = 50mm, the pipe wall thickness is 105mm, and wherein the inner walls of the 316L stainless steel pipes are covered with an anti-corrosion coating.

Description

Calibration system for gas flow metering Technical Field The utility model relates to the technical field of measuring instrument detection, in particular to a gas flow metering calibration system. Background Flow metering plays an important role in industry. In the hydrogen energy industry, such as hydrogen production, hydrogen storage, hydrogen transportation, hydrogenation, hydrogen utilization and the like, accurate measurement of hydrogen flow is not available. However, hydrogen has the complex characteristic of being inflammable and explosive, which makes higher demands in designing and building a hydrogen flowmeter standard system. In the hydrogen energy industry, accurate measurement of hydrogen flow is particularly important, but the accurate measurement of hydrogen flow at present lacks a sound standard, and related management standards and systems are relatively lagged, and the aspects of hydrogen flow meter quantity value transmission and traceability system establishment are still in an exploration stage. Hydrogen flow standard systems have been developed in japan, the united states, swiss, etc., and there are mainly the standard meter method, the pVTt method, the weighing method (also called Mt method), etc. The hydrogen flow measurement has the characteristics of high pressure, large flow, complex physical properties and the like, is limited by the volume scale and performance of a measuring device, and is limited in that the sonic nozzle calibration technology performed under the good laboratory conditions cannot be directly applied to the calibration and calibration work of the hydrogen field real flow. Disclosure of utility model In view of the deficiencies of the prior art, the present utility model is directed to a calibration system for gas flow metering. In order to achieve the above purpose, the present utility model adopts the following technical scheme: A calibration system for gas flow measurement comprises a gas source part, an experimental pipe section, a sonic nozzle set and a controller; The air source part comprises an air storage tank and an automatic pressure controller, and the air storage tank is communicated with the automatic pressure controller through a flange plate and a connecting pipe section; The experimental pipe section comprises a first detected flowmeter pipeline, a second detected flowmeter pipeline, a detected meter, an upstream pressure meter, an upstream hygrothermograph, a downstream pressure meter and a downstream hygrothermograph, wherein the inlet end of the detected meter is connected with the automatic pressure controller through the first detected flowmeter pipeline, and the outlet end of the detected meter is connected with one end of the second detected flowmeter pipeline; The system comprises a sonic nozzle group, a sonic nozzle group upstream pressure gauge, a sonic nozzle group downstream pressure gauge, a sonic nozzle group hygrothermograph, an upstream electric valve and a downstream electric valve, wherein the inlet of the upstream electric valve and the sonic nozzle group is communicated through an upstream pipeline, the outlet of the sonic nozzle is communicated with the downstream electric valve through a downstream pipeline, the sonic nozzle group upstream pressure gauge and the sonic nozzle group downstream pressure gauge are respectively connected with the upstream pipeline and the downstream pipeline, the sonic nozzle group hygrothermograph is connected with the upstream pipeline, the upstream electric valve is connected with a detected flowmeter pipeline II, the controller is connected with each upstream electric valve and the downstream electric valve in a control manner; The automatic pressure controller, the inspected meter, the upstream pressure meter, the upstream hygrothermograph, the downstream pressure meter, the downstream hygrothermograph, the sonic nozzle group upstream pressure meter, the sonic nozzle group downstream pressure meter, the sonic nozzle group hygrothermograph, the upstream electric valve and the downstream electric valve are all in communication connection with the controller. Further, the air storage tank is made of 316L stainless steel, and the inner wall of the air storage tank is covered with an anti-corrosion coating. Further, the upstream hygrothermograph and the upstream pressure gauge and the downstream hygrothermograph are not on the same horizontal plane, and the included angle of the surface is 90 degrees. Further, the outlet header line is connected to a muffler or a gas recovery device. Further, an upstream pressure gauge of the sonic nozzle set is installed at a position 0.9D-1.1D away from the inlet plane of the sonic nozzle, and a hygrothermograph of the sonic nozzle set is installed at a position 1.8D-2.2D away from the inlet plane of the sonic nozzle, wherein 1.0D is 50mm. Furthermore, the hygrothermograph of the sonic nozzle set and the upstream pressure gauge of the sonic nozzle set are no