Device for detecting gas in single-end in-situ pipeline, and working method thereof

Abstract

The invention provides a device for detecting a gas in a single-end in-situ pipeline, and a working method thereof. The gas detection device comprises a light source, a detector, a purging unit and afirst tube extending into the pipeline, and the part, extending into the pipeline, of the first tube has a gap facing away from the direction of gas flow in the pipeline. The device for detecting thegas in the single-end in-situ pipeline further includes: a first isolation part arranged on the light path of measurement lights emitted by the light source to make the measurement lights penetrate and used for isolating the light source from the gas in the pipeline, wherein one side or two sides of the first isolation part is / are provided with one or two elastic sealing parts along the directionof the measurement lights; and a driving unit for transmitting energy to the first isolation part to make the first isolation part vibrate back and forth along the direction of the light path of the measurement lights. The device has the advantages of high detection precision and the like.

Description

technical field [0001] The invention relates to gas detection, in particular to a single-end 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] Single-ended in-situ laser gas analyzers have the following advantages over pierced laser analyzers: [0004] 1. Easy to install, only need to open a hole for installation, only need to build a single-sided platform, only need to put a single-sided cable, only need one side of the valve and other materials, reducing engineering installation costs; [0005] 2. The installation has small space requirements, and for some occasions where the installation space is insufficient, only single-ended install...

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Problems solved by technology

[0005] 2. The installation has small space requirements, and for some occasions where the installation space is insufficient, only single-ended installation can be performed;

[0009] 1. Since the reflective end is inserted into the pipe, the reflective lens is easily polluted by the process gas. After the pollution causes the reflected light intensity to drop to a critical point, the instrument will not be able to measure normally;

[0010] 2. After the reflective lens is polluted, it is difficult to maintain due to the gas inside the pipe

[0011] 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

[0012] 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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