CEMS using hot wet extractive method based on DOAS

Bo Sun; Chi Zhang; Changku Sun

doi:10.1117/12.904792

30 November 2011 CEMS using hot wet extractive method based on DOAS

Bo Sun, Chi Zhang, Changku Sun

Proceedings Volume 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 82011E (2011) https://doi.org/10.1117/12.904792
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

A continuous emission monitoring system (CEMS) using hot wet extractive method based on differential optical absorption spectroscopy (DOAS) is designed. The developed system is applied to retrieving the concentration of SO₂ and NOx in flue gas on-site. The flue gas is carried along a heated sample line into the sample pool at a constant temperature above the dew point. In this case, the adverse impact of water vapor on measurement accuracy is reduced greatly, and the on-line calibration is implemented. And then the flue gas is discharged from the sample pool after the measuring process is complete. The on-site applicability of the system is enhanced by using Programmable Logic Controller (PLC) to control each valve in the system during the measuring and on-line calibration process. The concentration retrieving method used in the system is based on the partial least squares (PLS) regression nonlinear method. The relationship between the known concentration and the differential absorption feature gathered by the PLS nonlinear method can be figured out after the on-line calibration process. Then the concentration measurement of SO₂ and NOx can be easily implemented according to the definite relationship. The concentration retrieving method can identify the information and noise effectively, which improves the measuring accuracy of the system. SO₂ with four different concentrations are measured by the system under laboratory conditions. The results proved that the full-scale error of this system is less than 2%FS.

Citation Download Citation

Bo Sun, Chi Zhang, and Changku Sun "CEMS using hot wet extractive method based on DOAS", Proc. SPIE 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 82011E (30 November 2011); https://doi.org/10.1117/12.904792

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KEYWORDS

Calibration

Absorption

Photonic integrated circuits

Nitrous oxide

Control systems

Sensors

Absorption spectroscopy

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