In-place gas measurement method and in-place gas measurement device
A gas measurement and gas technology, which is applied in the field of on-site gas measurement, can solve problems such as instability and large measurement errors, and achieve the effect of small measurement errors and stable measurement optical path
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Example Embodiment
[0040] Example 1:
[0041] figure 2 The basic structure diagram of the on-site gas measuring device according to the embodiment of the present invention is schematically given. Such as figure 2 As shown, the gas measuring device includes:
[0042] Laser and driving circuit 2, detector 20, analysis unit 30 and purge unit 21. Windows 16 and 17 are provided on the measuring channel to isolate the process gas 11.
[0043] The gas interfaces 23, 24 are respectively arranged at the first gas discharge pipe 10 provided by the purge unit 21 for allowing the second gas to pass through the interface and follow the process in the pipe The flow direction of the gas 11 is discharged into the pipeline, thereby forming a gas wall separating the first gas and the process gas, and maintaining the stability of the measurement optical path between the two gas walls; preferably, the width of the gas interface is [0.1mm, 1.0mm].
[0044] A gas supply unit 22, the gas supply unit 22 is used to supply ...
Example Embodiment
[0056] Example 2:
[0057] image 3 The basic structure diagram of the on-site gas measuring device according to the embodiment of the present invention is schematically given. Such as image 3 As shown, the difference between the gas measuring device and Embodiment 1 is:
[0058] The measuring device further includes an inner tube for passing the measuring beam 19 and the first gas, and the gas interfaces 23, 24 are arranged at the end of the inner tube deep into the pipeline. Optionally, the gas channel is arranged outside the inner tube.
Example Embodiment
[0059] Example 3:
[0060] An application example of the measuring device and method according to Embodiment 2 of the present invention in the detection of hydrogen sulfide in a natural gas pipeline.
[0061] In this application example, the light source is a VCSEL laser, and the emitted wavelength contains the absorption spectrum line 1588nm corresponding to hydrogen sulfide, the flow rate of the first gas is 2m / s, and the flow rate of the process gas in the pipeline is 0.1m / s , The width of the gas interface is 0.2mm, and the flow rate of the second gas passing through the gas interface is 120m / s. At this time, the second gas forms a gas wall that separates the first gas from the process gas, such as Figure 4 As shown, there is a measurement optical path between the two gas walls, which ensures the stability of the measurement optical path, thereby reducing measurement errors.
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