Detection device and detection method of ammonia gas and sulfur dioxide gas concentration

Abstract

The invention relates to a detection device and a detection method of ammonia gas and sulfur dioxide gas concentration. The device consists of an ultraviolet light source, a collimate lens, a runner, a gas absorption pool, a convergent lens, an ultraviolet optical fiber, a spectrograph and a computer. By adopting the detection device and the detection method, the problem that the FFT characteristic frequency peak values of the absorption spectrum of two gases interfere with each other can be solved. The detection device and the detection method have the advantages of not needing measurement on a gas absorption cross section and being simple in calculation, high in response speed and the like, the temperature and pressure do not need to correct the absorption cross section, the cost is low, and the stability is good.

Description

technical field [0001] The invention relates to gas concentration detection, in particular to a detection device and a detection method for the concentration of ammonia gas and sulfur dioxide gas. Background technique [0002] With the development of my country's economy, the consumption of electricity and coal is increasing day by day. Thermal power generation will produce a large amount of nitrogen oxides and sulfur dioxide, which will cause harm to the environment. Therefore, it is one of the key points of national energy conservation and emission reduction. Generally, selective catalytic reduction (SCR) flue gas denitrification technology is used for reducing nitrogen oxide emissions in coal-fired power plants. NH used for denitrification 3 Escape is one of the key indicators of the process control. For ammonia (NH 3 ) concentration detection, compared with the traditional electrochemical method, the optical method has the characteristics of non-contact, fast and high...

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Problems solved by technology

However, when the quasi-periodic absorption characteristics of two gases in the same band are the same or similar, the mutual influence of the two gases will be very serious. Since the absorption lines of the two gases are not absolutely periodic, the absorption of one will affect the FFT of the other. The peak also contributes, directly using the peak at the FFT characteristic frequency to invert the concentrations of the two gases at the same time will produce a large error, especially in high SO 2 Under the gas concentration (5000~10000ppm), it is impossible to accurately measure the 200~230nm band and SO 2 Low NH with severe overlapping absorption 3 Gas concentration (0~20ppm)

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