In-situ pipeline gas detection device and its working method

Abstract

The invention provides an in-situ gas detection device in a pipeline and a working method thereof. The in-situ gas detection device in a pipeline includes a purging unit which communicates with the interior of the pipeline; the balance component includes: one end of a cylindrical member The inside of the pipeline is connected through a pipeline; the piston is arranged in the cylindrical part; one end of the spring is fixed on the piston, and the other end is fixed on the cylindrical part; the gas inlet and the gas outlet are arranged in the cylindrical part On the opposite sides of the piston, the gas outlet communicates with the purging unit; the overlapping area S between the side of the piston and the gas outlet 1 and the cross-sectional area S of the gas outlet 2 The ratio of M∈[0,1], and the change of the overlapping area ΔS 1 The relationship with the deformation Δx of the spring is: ΔS 1 =k·Δx, k is a constant, and P 入 is the gas pressure at the gas inlet, K is the stiffness coefficient of the spring, S 3 is the cross-sectional area of ​​the piston perpendicular to the direction of motion. 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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