Photoacoustic system for NH3 detection in a selective catalytic reactor

Nice Pintus; Isabella Carrer; Ada Del Corno; Lorenzo Fiorina; Eugenio Zanzottera

doi:10.1117/12.221027

20 September 1995 Photoacoustic system for NH3 detection in a selective catalytic reactor

Nice Pintus, Isabella Carrer, Ada Del Corno, Lorenzo Fiorina, Eugenio Zanzottera

Proceedings Volume 2506, Air Pollution and Visibility Measurements; (1995) https://doi.org/10.1117/12.221027
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

A new instrument specifically developed for measuring NH₃ concentrations at the inlet and outlet of an SCR reactor is described. It is based on the photoacoustic technique and can perform an online and in-situ n-point measurement grid. The major problem is the severe interference of CO₂ combustion gas that absorbs at the same wavelength used for NH₃, lowering the sensitivity of the technique. A ¹³CO₂ tunable laser emitting at three wavelengths has been used in order to evaluate simultaneously the CO₂ and NH₃ concentration. The integrated measurements have been done by a simple differential absorption technique by using a pyroelectric detector; the spatially resolved measurements have been carried out through the analysis of the acoustic wave generated by the laser beam and collected by four microphones perpendicularly disposed. Experimental tests on a 35 MW industrial plant and comparison with traditional sampling methods are presented.

Citation Download Citation

Nice Pintus, Isabella Carrer, Ada Del Corno, Lorenzo Fiorina, and Eugenio Zanzottera "Photoacoustic system for NH3 detection in a selective catalytic reactor", Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); https://doi.org/10.1117/12.221027

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