Ultraviolet gas analysis method and ultraviolet gas analyzer

Abstract

The invention provides an ultraviolet gas analysis method and an ultraviolet gas analyzer. In the absorption band of the gas to be measured, a part of the bands are selected from the bands with uniform fluctuation trends as sampling bands; For the measured gas with known concentration, in the sampling band, select the measurement band and the reference band, and calculate the compensated absorbance of the measured gas; through fitting, the relationship between the compensated absorbance of the measured gas and the concentration of the measured gas is obtained and stored ; When the gas to be measured is passed into the ultraviolet gas analyzer, its absorption curve is obtained in real time, and the real-time compensation absorbance obtained by dividing the average absorbance of the measurement band by the average absorbance of the reference band is substituted into the stored concentration formula to obtain the measured Real-time concentration data of gases. The beneficial effects of the invention are: the reference measurement is realized only through a single-channel air chamber combined with a software algorithm, long-term drift is eliminated, and the method has good stability, low cost and good real-time performance.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to an ultraviolet gas analysis method and an ultraviolet gas analyzer. Background technique [0002] Biogas is a flammable mixed gas, generally containing methane, carbon dioxide, ammonia, hydrogen and hydrogen sulfide and other gases. In the past, biogas analyzers were usually mainly used to detect the content of indicator gases such as methane, carbon dioxide and oxygen, and did not pay attention to the content of hydrogen sulfide. However, hydrogen sulfide in biogas is a harmful gas, which is harmful to pipelines, instruments and equipment. It has a strong corrosive effect, and if it leaks in the air, it will pollute the atmosphere and endanger human health. Therefore, the monitoring of hydrogen sulfide content in biogas cannot be ignored. [0003] my country's environmental protection standards strictly stipulate that when using biogas energy, the H2S content in the bioga...

AI Technical Summary

Problems solved by technology

Since hydrogen sulfide gas has a significant absorption peak at 228 nanometers and almost no absorption at 361 nanometers, these two bands can be used as measurement and reference channels respectively to form a differential measurement system. Although this scheme achieves reference measurement, However, it contains two detectors and a semi-reflective mirror, which has a complex structure and high cost, and the consistency difference between the two detectors will also bring errors to the measurement results and affect the measurement accuracy of gas concentration.

[0009] To sum up, in the prior art, the reference measurement is realized through the double optical path structure with the light slicer and / or semi-transparent and semi-reflective lens, resulting in poor reliability, complex structure and high cost of the existing gas analyzers

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