Microwave-based control of an SCR-based flue gas aftertreatment system for biomass combustion

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Streibl, Benedikt ; Moos, Ralf ; Wöhrl, Thomas ; Ritter, Thomas ; Hagen, Gunter:
Microwave-based control of an SCR-based flue gas aftertreatment system for biomass combustion.
2026
Veranstaltung: Eurosensors XXXVIII , September 6-9, 2026 , Zurich, Switzerland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )
DOI: https://doi.org/10.5162/eurosensors2026/6.1.1

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Abstract

Selective catalytic reduction (SCR) is essential for reducing NOₓ emissions from biomass ‑ fired plants, where fluctuating fuel composition leads to strongly varying raw emissions. Conventional SCR control relies on fixed calibration curves or gas sensors, which can cause inefficiencies and NH 3 slip. This work investigates a radio frequency (RF) ‑ based approach in which the catalyst itself acts as a sensor by monitoring its electromagnetic properties. Experiments show a clear correlation between RF signals and NH 3 storage on commercial vanadia-based catalysts. The results indicate that RF ‑ based control enables more precise and robust SCR operation than conventional gas sensor‑based methods.