Dry-wet oxygen delay time self-compensation method during dual oxygen sensor absolute humidity measurement

Abstract

The present invention provides a dry-wet oxygen delay time self-compensation method during dual oxygen sensor absolute humidity measurement. The method comprises the following steps that: 1, a gas input end of a dual oxygen sensor absolute humidity meter is provided with a disturbance device, and the disturbance device introduces disturbance gas to a gas path; and 2, oxygen concentration curves measured by a dry oxygen sensor and a wet oxygen sensor produce characteristic peaks with the disturbance gas, an algorithm is adopted to obtain a characteristic peak production starting time T1 of the wet oxygen concentration curve and a characteristic peak production starting time T2 of the dry oxygen concentration curve, and calculation is performed to obtain a delay time T of the dry oxygen concentration curve relative to the wet oxygen concentration curve, wherein T is difference between T2 and T1. In the prior art, time difference exists when sample gas flows from the wet oxygen sensor to the dry oxygen sensor due to different operating conditions and different flow rates so as to cause low accuracy during dual oxygen sensor absolute humidity measurement. With the dry-wet oxygen delay time self-compensation method, the problem in the prior art is solved.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a self-compensating method for the lag time of dry and wet oxygen in the absolute humidity measurement of a dual oxygen sensor used in the field of industrial process and environmental monitoring. Background technique [0002] The measurement principle of the absolute humidity meter of the double oxygen sensor: the determination of the oxygen concentration of the measured gas before dehumidification (hereinafter referred to as wet gas, abbreviated as WG) and the oxygen concentration of the measured gas after dehumidification (hereinafter referred to as "dry gas", referred to as "DG") The determination of the concentration, the moisture content in the flue gas is obtained by the formula (1). [0003] x SW =1-X WG / X DG (1) [0004] Where: X WG --------------------------- the volume percentage of oxygen in the humidity, %; [0005] x DG ---------------------------...

AI Technical Summary

Problems solved by technology

However, in current applications, it is very difficult and complicated to accurately measure the lag time T

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