Pellets based on biofuels

Abstract

Laboratory analyzes showed that the wood chips had a higher bulk density and a significantly lower ash content than wood pellets produced by the company technological process company Pelletia-cz. using an annular granulator with a pellet outlet temperature of 80-90 ° C. The water content and calorific value of the wood chips were slightly lower than that of the wood pellets. The content of volatile combustibles and the elemental composition of the two compared energy raw materials did not differ significantly. On the contrary, significant differences were found in herbal pellets (from winter wheat straw, winter rye straw and from whole triticale) produced by the identical process. It was shown that both the plant material and the addition of 3 wt. clay flours (binders) affect their parameters. For example, the proportion of fine material by the addition of a binder was significantly reduced in rye (to 0.17% by weight) and triticale pellets (to 0.04% by weight). On the other hand, the disadvantage of adding clay flour as a binder additive is the increase in the ash content, which reduces the calorific value of the pellets. The heat of combustion of pellets made of wood materials was about 2.5 MJ / kg higher than that of herbal pellets. Combustion of pellets from the three types of herbs monitored produces more emissions of chlorine and nitrogen oxides contaminants than wood samples relative to wood samples. The chlorine content in ashes from herbal pellets compared to ashes from wood materials was about 50 times higher. The nitrogen content in the compared raw materials was about 5–15 times higher for herbs.