Positive-pressure high-temperature gas standard device taking sonic nozzle as standard device

Abstract

The invention discloses a positive-pressure high-temperature gas standard device taking a sonic nozzle as a standard device. The positive-pressure high-temperature gas standard device comprises an air compressor, a steady-flow container, a standard device unit, a gas heating unit and a detected meter unit, wherein the standard device unit is composed of a stagnation container and a plurality of sonic nozzles. The outlet end of the air compressor is connected with the inlet end of the steady-flow container, the outlet end of the steady-flow container is connected with the inlet end of the stagnation container, a verification medium enters the stagnation container, then flows out through a plurality of sonic nozzles and then enters the gas heating unit through a collecting pipe, and the verification medium is heated, flows through the detected meter unit and then enters the air cooling unit through a pipeline; the temperature and pressure acquisition unit acquires temperature and pressure values of the standard device unit and the detected meter unit. The positive-pressure high-temperature gas standard device can calibrate the gas flow meter under the high-temperature working condition, corresponding temperature and pressure values and signals of a detected meter are controlled and collected through the upper computer, and then the difference value between the detected meter and the standard device is judged, so that an error result is calculated.

Description

technical field [0001] The invention relates to a positive pressure high temperature gas standard device, in particular to a positive pressure high temperature gas standard device using a sonic nozzle as a standard device. Background technique [0002] With the rapid development of my country's industry, gas flow meters are widely used in key occasions such as chemical industry, smelting, and trade transfer. Among them, the demand for high-temperature gas flow meters has soared in recent years, and they are widely used in smelting, chemical, heat transfer and other industries. However, how to verify or calibrate these flowmeters has become a difficult problem in the measurement industry. [0003] The currently used method is to calibrate the high temperature flowmeter on a normal temperature device, such as a differential pressure flowmeter and a vortex flowmeter. The calibration data under normal temperature conditions cannot fully reflect the actual use of the flowmeter. T...

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Problems solved by technology

[0004] Aiming at the problem that the high-temperature gas flowmeter cannot be calibrated under high-temperature conditions, and the normal temperature calibration cannot truly reflect the performance of the high-temperature gas flowmeter, the present invention provides a positive pressure high-temperature gas standard device using a sonic nozzle as a standard device

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