Experimental study on combustion and emission characteristics of biomass pellets

To study the combustion and emission characteristics of biomass pellets, eight kinds of typical pellets were chosen to be investigated with an imported biomass pellet fuel burners using as experimental device in this study. The results indicated that the more the volatile matter and moisture in the biomass pellets, the shorter the igniting time. The pollutants such as SO2, NOx and so on were far below the national standard. But there were some problems existed for several pellets, such as the ash content was too large, the slagging was too seriously. For most kinds of pellets, the higher the content of chemical elements like Si and the alkali metal group in biomass pellets, the easier to form slag; and the higher content of alkaline earth metal group, the harder to form slag. For example, the content of Si in corn straw was 27.70%, and the clinkering rate of bottom ash was 48.84%. However, the content of Si in corn straw was only 9.76% with no slagging. When adding additives, the clinkering rate of bottom ash of corn-straw-pellets fell 22.77%. So it could provide the basis data for improving and designing the burning equipments of biomass pellet that adapt to the situation in China.