Abstract

Continuous emission monitoring system (CEMS) is used to real-time monitor flue gas. In this article, a new wet-dry two-step-method CEMS based on differential optical absorption spectroscopy (DOAS) is introduced. The principle of wet-dry two-step method is that the heated flue gas is sampled through probe and heated pipe, then is directly guided to a heated chamber where the concentration of the gaseous pollutant, such as SO2, NOx, HCl, and NH3, is analyzed using DOAS algorithm. Then the gas is cooled and desiccated, and the concentration of CO/CO2 is measured. This measurement technique owns many advantages including high precision, complete type of analyzed gases, compact in structure and easy operation, etc., compared with widely used extractive cooling CEMS technique and in-situ CEMS technique.

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