Measurements at two different biomass-fuelled combustion power plants are conducted in order to investigate NOx emissions. The thermal energy input of the industrial-sized combustion facilities ranges from 0.85 MWth for the injection combustion to 40.4 MWth for the bubbling fluidized bed. These two facilities with different combustion technologies also employ different fuels, e.g., wood chips, waste wood and pencil residues. The measurements are conducted simultaneously with a two-measuring point approach entailing flue gas measurements near the particle filter and gas measurements in the combustion chamber. A specially designed high-temperature probing lance is implemented to collect gas from the combustion chamber before the gas is analysed with a Fourier-transformed infrared spectrometer (FTIR). This analysis method enables the measurement of NOx and its intermediates (NH3 and HCN) in the combustion zone and a comparison with the emitted NOx downstream. The results indicate that the emission levels depend on the fuel characteristics and are slightly below but close to the permitted limits.     «

Measurements at two different biomass-fuelled combustion power plants are conducted in order to investigate NOx emissions. The thermal energy input of the industrial-sized combustion facilities ranges from 0.85 MWth for the injection combustion to 40.4 MWth for the bubbling fluidized bed. These two facilities with different combustion technologies also employ different fuels, e.g., wood chips, waste wood and pencil residues. The measurements are conducted simultaneously with a two-measuring poin...     »