FLOW CHARACTERISTICS OF RDF AND SAND MIXTURE IN A SPOUTING-MOVING BED

摘要

Refuse derived fuels(RDF), made from solid wastes, are suitable for treatment and utilization of solid wastes. In order to use the RDF efficiently, a spouting-moving bed pyrolyzing combustor was proposed in this study. Experiments were carried out in a spouting-moving bed consists of plexiglass of internal diameter 190 mm and height 1200 mm and a 60°casting conical base distributor in which 72 holes are perforated horizontally. The experimental results show that the pressure drop increases with increasing auxiliary gas velocity, while spouting gas velocity has little effect on the pressure drop after particles being spouted. Comparing with other literature, horizontal introduction of auxiliary gas can decrease the minimum spouting velocity than the vertical introduction of auxiliary gas. Four flow regimes as packed bed, spouting-moving bed, spouted bed with pulsation and slugging bed are observed when auxiliary gas velocity and spouting gas velocity are changed into different levels.