In-situ pipeline gas detection device and its working method
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A gas detection and pipeline technology, applied in the field of in-situ gas detection devices in pipelines, can solve the problems of high cost, fluctuating gas concentration value, low reliability, etc.
Active Publication Date: 2021-02-09
FOCUSED PHOTONICS
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[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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Embodiment 1
[0039] figure 1 A schematic structural diagram of the in-situ gas detection device in the pipeline according to the embodiment of the present invention is schematically given, as shown in figure 1 As shown, the in-situ pipeline gas detection device includes:
[0040] A purge unit, the purge unit is connected to the interior of the pipeline, and the purge gas enters the purge unit, thereby isolating the optical device and the gas in the pipeline to prevent the optical device from being polluted;
[0041] A balancing component, the balancing component comprising:
[0042] a cylindrical member, one end of the cylindrical member communicates with the interior of the pipeline through a pipeline;
[0043] a piston disposed within the barrel;
[0044] a spring, one end of the spring is fixed on the piston, and the other end is fixed on the cylindrical member;
[0045] A gas inlet and a gas outlet, the gas inlet and the gas outlet are arranged on opposite sides of the cylinder, th...
Embodiment 2
[0051] An application example of the in-situ pipeline gas detection device and its working method according to Embodiment 1 of the present invention in the detection of gas concentration in pipelines.
[0052] In this application example, the in-situ pipeline gas detection device includes:
[0053] A light source, such as a tunable semiconductor laser, the measurement light emitted by the light source passes through the purge unit on one side of the pipeline and then enters the pipeline, interacts with the gas in the pipeline and then passes through the purge unit on the other side of the pipeline After being received by the detector;
[0054] a detector, the detector converts the received optical signal into an electrical signal; the light source and the detector are arranged on opposite sides of the pipeline;
[0055] An analysis unit, the analysis unit uses absorption spectroscopy to process the electrical signal, so as to know the gas content in the pipeline;
[0056] In...
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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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Application Information
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