DENSE PHASE CONVEYING OF FINE COAL AT HIGH TOTAL PRESSURES

Two sizes of fine coal have been transported at room temperature at pressures up to 82.7 bar through horizontal lines 6.25, 9.19 and 12.5 mm in diameter and up to 105 m long using nitrogen, hydrogen, and carbon dioxide. Pressure differentials were established between two pressure vessels and solids and gas flow rates were measured. Solids fluxes up to 2000 kg/(m2·s) were achieved at superficial gas velocities between 0.8 and 10 m/s in dense phase conveying. Separate pressure drop measurements were made over the acceleration zone and across bends, and correlations are presented for the contributions made to the total pressure drop by bends, acceleration and solids friction. © 1990.