P4.2 - Tunable Diode Laser Spectrometry (TDLS) - Challenges in NH3 Measurements in Hot and Humid Exhaust Gas

A. Seifert, M. Studer & Th. Hessler
In power generation, as well as in automotive emission control, NOx can be reduced by 99% with Selective Catalytic Reduction (SCR), where ammonia (NH3) or urea is injected into the exhaust gas and reacts over a catalyst with NOx o nitrogen and water. This process needs to be controlled well in order to reduce “ammonia slip”, which is the target of increasingly stringent emission control requirements. Due to the residual content of ammonia in the...