Flue gas analyzer based on ultraviolet differential absorption spectrometry and measuring method
A technology of flue gas analyzer and absorption spectroscopy, which is applied in the direction of color/spectral characteristic measurement, material analysis through optical means, and measurement devices, etc. System complexity and other issues, to achieve the effect of fast processing information, improved program control and operating system control, and less manual intervention
Active Publication Date: 2021-07-09
TIANJIN TONGYANG TECH DEV
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[0004] At present, most of the flue gas analyzers on the market are direct-measurement flue gas analyzers. The direct-measurement type uses the flue as an open absorption pool for real-time and continuous direct measurement of the gas, and does not require a pretreatment system. Although it is easy to install and maintain The amount is small, and it is not affected by the smoke and water mist in the flue within a certain range, but this method is ineffective when the smoke or water mist is high, the consumables are more expensive, and maintenance requires professionals, especially When the protective instrument fails, the equipment is easily polluted by the flue gas and the data will be invalidated, and it is not easy to carry out the comparative experiment of the standard substance on site
In addition, due to the complex composition of the flue gas at the ultra-low emission site, and the low concentration of sulfur dioxide and nitrogen oxide emissions, most of the flue gas analyzers are conventional range analyzers at present, which can no longer meet the monitoring requirements. The measurement of analyzers in low-concentration areas is easily affected by background gas interference. Some ultraviolet flue gas analyzers use multiple reflection measurement cells to improve detection sensitivity. Multiple reflection measurement cells increase the complexity of the system. Compared with Poor stability of straight-through pool and increased difficulty of on-site maintenance
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[0051]The device of the present invention redesigns the structural part, improves the measurement gas cell and the spectrometer part, increases the temperature control part to prevent errors caused by excessive temperature changes, increases flow rate control monitoring, and adds temperature correction items and flow rate correction items to improve the inversion concentration calculation. Algorithm, even low concentration values can get accurate results.
[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0053] Such as figure 1 As shown, it is a schematic diagram of the overall structure in the cabinet of the present invention; wherein, it includes:
[0054] Gas path module, used for input and output flue gas analyzer of flue gas to be tested;
[0055] The optical ...
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The invention provides a flue gas analyzer based on ultraviolet differential absorption spectroscopy, comprising: a gas path module used for inputting and outputting flue gas to be detected into and out of the flue gas analyzer; an optical path module is used for converting an optical signal obtained after the flue gas to be detected passes through a spectrograph into the circuit module; and the circuit module used for carrying out concentration inversion calculation. The invention also provides a method for measuring the flue gas concentration by using the flue gas analyzer.
Description
technical field [0001] The invention relates to the technical field of gas concentration measurement and analysis, in particular to a flue gas analyzer and a measurement method based on ultraviolet differential absorption spectroscopy. Background technique [0002] With the development of domestic industry, the country has begun to pay attention to environmental pollution. Local environmental protection departments have successively issued emission standards for the emission concentrations of various polluting gases such as smoke, sulfur dioxide, and nitrogen oxides in industrial production. At the same time, the detection requirements for the concentration of each component of the flue gas are more precise and strict to ensure real-time and accuracy. [0003] Differential absorption spectroscopy (DOAS) was first proposed by Platt of the Institute of Environmental Physics, University of Heidelberg, Germany. It mainly uses the characteristic absorption of absorbing molecules...
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IPC IPC(8): G01N21/33G01N21/01
CPCG01N21/33G01N21/01G01N2021/0112Y02A50/20
Inventor 张涛李永刚李洪刚王磊关淑翠
Owner TIANJIN TONGYANG TECH DEV