In-situ in-pipe gas detection device and working method thereof

Abstract

The invention provides an in-situ in-pipe gas detection device and a working method thereof. The in-situ in-pipe gas detection device comprises a purging unit communicating with the interior of a pipeand further comprises a balancing component, wherein the balancing component comprises a tubular member, a piston, a spring, a gas inlet and a gas outlet; one end of the tubular member communicates with the interior of the pipe through a pipeline; the piston is arranged in the cylindrical member; one end of the spring is fixed on the piston, and the other end of the spring is fixed on the tubularmember; the gas inlet and the gas outlet are form in two opposite sides of the tubular member; and the gas outlet communicates with the purging unit. The ratio M of an overlapping area S1 between theside surface of the piston and the gas outlet to the sectional area S2 of the gas outlet belongs to the set [0, 1]; i.e., the relation of the change delta<S1> of the overlapping area S1 and the deformation quantity delta<x> of the spring satisfies the equation that delta<S1>=k*delta<x>, wherein k is a constant; and k=(K*S2 / P<lambda>*S3), wherein P<lambda> is gas pressure at the gas inlet, K is the elasticity coefficient of the spring, and S3 is the sectional area, perpendicular to the direction of movement, of the piston. The in-situ in-pipe gas detection device of the invention has the advantages of high detection precision and the like.

Description

technical field [0001] The invention relates to gas detection, in particular to an in-situ gas detection device in a pipeline and a working method thereof. Background technique [0002] For gas analysis instruments for in-situ measurement, in order to protect the optical system of the analysis instrument from being polluted by dust and oil in the process gas, clean high-pressure nitrogen or instrument-grade compressed air is usually used for purging protection. [0003] For the above-mentioned in-situ gas analysis instrument with purging structure, when the pressure of the gas in the pipeline is relatively stable, the analysis instrument can accurately reflect the true concentration of the gas in the pipeline; when the pressure of the gas in the pipeline fluctuates, the output of the analysis instrument The gas concentration value fluctuates accordingly, which cannot truly reflect the true concentration of the gas in the pipeline. [0004] The above-mentioned problems have ...

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Problems solved by technology

[0003] For the above-mentioned in-situ gas analysis instrument with purging structure, when the pressure of the gas in the pipeline is relatively stable, the analysis instrument can accurately reflect the true concentration of the gas in the pipeline; when the pressure of the gas in the pipeline fluctuates, the output of the analysis instrument The gas concentration value fluctuates accordingly, which can no longer truly reflect the true concentration of gas in the pipeline

[0004] The above problems have been plagued by manufacturers of in-situ gas analysis instruments, and the reasons for the above problems have not been found

Although this solution can accurately obtain the real concentration of the gas in the pipeline, it also brings many shortcomings such as long delay time, complex pretreatment structure, high cost, and low reliability.

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