Device and method for measuring hydrogen permeability of a hydrogen storage bottle

Abstract

The invention provides a device and a method for measuring hydrogen permeability of a hydrogen storage bottle. A high-purity nitrogen source is connected with a gas mass flow meter through a gas supply pipeline, and a gas supply valve is arranged on the gas supply pipeline; the downstream of the gas mass flow meter is connected with a gas supply one-way valve which is connected with a sealed metalcavity through a gas inlet pipeline; a hydrogen storage bottle can be placed in the sealed metal cavity, the sealed metal cavity is communicated with a vacuum pump through an exhaust pipeline, and anexhaust valve is arranged on the exhaust pipeline; and the sealed metal cavity is also connected with a mass spectrometer. When the device is in use, the hydrogen storage bottle is placed in the sealed metal cavity, the gas supply valve is closed, the vacuum pump is opened, the sealed metal cavity and a pipeline connected with the sealed metal cavity are vacuumized, and then the air exhaust valveis closed; the gas supply valve is opened to enable nitrogen to enter the sealed metal cavity; the proportion of nitrogen and hydrogen in the sealed metal cavity is measured through a mass spectrometer, the total amount of nitrogen is obtained through the gas mass flow meter, and the total amount of hydrogen seeping out of the hydrogen storage cylinder within the permeation time can be calculated.

Description

technical field [0001] The invention relates to a device and method for measuring the hydrogen permeability of a hydrogen storage cylinder. Background technique [0002] Taking the type IV gas cylinder (i.e. carbon fiber fully wound plastic liner gas cylinder) widely used in the world at present, if hydrogen passes through the plastic liner and precipitates into the carbon fiber material or the environment under high pressure, it will seriously affect the gas cylinder. safe use. [0003] For all kinds of hydrogen storage gas cylinders including Type IV carbon fiber full-wound plastic liner, hydrogen permeability is one of the key parameters for the safe use of gas cylinders. Therefore, the device and method for measuring the hydrogen permeability of hydrogen storage cylinders play an extremely important role in ensuring the safe use of hydrogen storage cylinders. [0004] Although currently there are hydrogen permeability measurement devices for materials, such devices are...

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Problems solved by technology

[0004] Although currently there are hydrogen permeability measurement devices for materials, such devices are often only for the measurement of smaller samples, and there is no hydrogen permeability measurement device and method for larger hydrogen storage cylinders.

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