Abstract
Abstract This paper mainly focuses on the concentration calculation of SO2 in flue gas. There are many methods for smoke detection. First of all, this paper mainly introduces the basic Differential Optical Absorption Spectroscopy technology. Then, in order to solve the problem of overlapping absorption between different gases in the flue gas, this paper use cyclic iteration algorithm to measure the concentration of SO2. It is concluded that the basic DOAS algorithm has a large error for the concentration measurement of mixed gas with overlapping absorption, the he error is above 25%. However, the cyclic iterative algorithm has a good effect on processing with it which can get a more stable result after three iterations, and the measurement error can be controlled finally within 2%.
Highlights
With the rapid development of industrialization and human destruction, their pollution is becoming more and more serious
People mainly use portable gas analysis equipment to carry on flue gas analyze, and The Differential Optical Absorption Spectroscopy (DOAS) is the most commonly and effective method which is used to real-time detect gas concentrations in the atmosphere by characteristic absorption of absorbable molecules in the near ultraviolet region[1]
In order to decrease limit of detection and enhance environment adaptability of the portable flue gas analyzer, to improve measurement accuracy, Wang Kunpeng completed the research and design of portable gas analyzer based on AVR micro-controller, and increase it’s detection accuracy and environmental adaptability[2]
Summary
With the rapid development of industrialization and human destruction, their pollution is becoming more and more serious. Deng Meng developed the portable gas analyzer based on the nondispersive ultraviolet absorption, and has improved resolution and stability in high humidity and low concentration of SO2 gas monitoring[3].Wang Jing designed concentration calculation method based on the least square method on the basis of DOAS algorithm, which is used in the short optical path and a low SO2 calculation[4]. In order to separate and calculate the gas concentration from the absorption spectrum signal of the mixed gas, Xu Shuping designed the portable smoke analyzer based on the cyclic iteration algorithm. It conclude that the method can simultaneously calculate various gas concentration and has strong anti-interference ability[7]. It can provide the best technical support for the factory exhaust emission monitoring and reduce the air pollution
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