Dynamic Solids Mixing Between Coal and Limestone in a Gas-Solid Fluidized Bed

Abstract

Dynamic characteristics of solids mixing between coal and limestone were studied. Experiments were carried out in a 0.203 m diameter cold fluidized bed with coal and limestone of different sizes as the fluidized particles. Experimental parameters examined included operation time, air Row rate, bed height, initial bed setup, relative particle size and relative amount of the two particles. The coal concentration profile was analyzed through bed sectioning, and a mixing index was used to describe the profile. The observed results were presented graphically and in correlation forms. The steady state results were also compared with those available in the literature.

Coal Cleaning Performance in an Air Fluidized Bed

“…Also, in some regions the use of water as a processing medium is often restricted. However, air-actuated (dry) processes are also available to reduce impurities from crushed coal (Kozanoglu et al, 1993;Ho et al, 1985). They have some significant advantages over wet cleaning: simpler equipment, and elimination of drying and wastewater disposal cycles.…”

Minimum fluidization velocity of binary mixtures

“…Umfmay be the best one, and ( U/UIvf) rather than ( U / Uhf) or ( U / U f ) is usually used as the diniensionless velocity by most investigators (Schouten et al, 1988;Ho et al, 1987;Carsky et al, 1986). From a practical point of view it may be said that the value of U,,fas well as U/,f and Uf is not very important.…”