Particle, CO and NOX emissions during the combustion of wood pellets as a function of the feeding mode and air staging.
Session chaired by Pr. Epaminondas Mastorakos
The results that will be presented concern the combustion of wood pellets in a domestic boiler. The objective of this study is to analyse the influence of the feeding mode and air staging on the quality of emissions. Different feeding methods are considered (pulsed and continuous feeding) in a pellet boiler (20 kW) with a drop feed. Gaseous and particulate emissions were sampled in the vicinity of the smoke exhaust and close to the boiler. The particle mass concentration is measured with a PPS and the particle size for submicronic particles with a mobility diameter analyzer (SMPS). Finally, a gas analyzer (CO-NOx) is used. The results show an increase in emissions between 400 and 800 ppm carbon monoxide with the pulsed feed mode. Whereas the values observed for continuous feed were 100 to 200 ppm. The typical particle size is between 50 and 60 nm. The air staging was done close to the granule bed at about 2 cm from its surface and we could observe significant variations in NOx and CO emissions depending on this air staging. This point will be analysed and discussed
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