The use of biomass for heat production in small scale combustion systems provides an on-site energy supply from renewable resources. Low pollutant emissions as well as heat output on demand are the basic requirements for the application of environmentally friendly and efficient systems.
Investigations regarding pollutant formation have been carried out at a micro-scale combustion system with a heat output between 1 and 2 kW. The flue gas composition under different combustion conditions was observed by variation of primary and secondary air supply. In this manner, the combustion with excess and deficient air was investigated amongst others. Beside the occurrence of incomplete oxidized carbon compounds (carbon monoxide, volatile organic compounds) also the influence of the air supply on nitrogen oxide concentration was monitored. The installation allows the integration of catalysts in different temperature zones. Preliminary considerations regarding the operation of the micro-scale system with a catalyst have been carried out.