Online calibration device and real-time calibration method for moisture metering gas

The invention discloses a moisture metering gas on-line calibration device which comprises a moisture introducing pipeline, a calibration pipeline and a moisture discharging pipeline which are horizontally and sequentially communicated, the inner diameter of the calibration pipeline is larger than that of the moisture introducing pipeline, and the pipe core line of the moisture discharging pipeline is located below the pipe core line of the calibration pipeline. The calibration pipeline is provided with a ray transmit-receive assembly. The invention also discloses a real-time calibration method for the moisture metering gas. The method comprises the following steps: firstly, connecting the device into a moisture collecting pipeline and starting to operate; the ray receiving and transmitting assembly outputs the initial ray intensity before passing through the pipeline and the attenuation ray intensity after passing through the pipeline; and finally, calculating a calibrated gas phase absorption coefficient ac