GASIFICATION BEHAVIOR OF BLENDED BIOMASS PELLETS IN A SMALL - SCALE FLUIDIZED BED REACTOR

摘要

Pellets blended from biogeneous residues, energy crops, and industrial residues offer alternativeoptions for energetic use of wood. Incineration and gasification behavior of alternative fuels partly differ widely fromthose of wood. A combination of all advantages and disadvantages of each fuel may lead to a well-designed fuelblend. The effects of different fuel blends on the gasification behavior are the focus of this investigation. Wood,straw, miscanthus and their blends were gasified with steam in a laboratory fluidized bed reactor at a processtemperature of 700 ℃ and 800 ℃. The results show the dependency of the product gas composition on a change ofthe fuel composition. So a linear increase of CO-concentration and a simultaneous decrease of CO_2-concentration arecaused by a rising wood fraction in the straw pellets. In contrast there is no effect on the CH_4-concentration bydifferent fuel mixtures. No explicit trend in H_2-concentration was found out.