IN DEVELOPPING A BENCH-SCALE CIRCULATING FLUIDIZED BED COMBUSTOR TO BURN HIGH ASH BRAZILIAN COAL-DOLOMITE MIXTURES
This work considers some of the questions in burning high ash Brazilian coal-dolomite mixtures in a bench-scale circulating fluidized bed combustor (CFBC). Experimental tests were performed with the CE4500 coal from Santa Catarina State, in southern Brazil, with a Sauter mean diameter dp=431μm. The coal particles were mixed with dolomite particles of dp=111μm and this fuel mixture was fed into the circulating fluidized reactor, previously loaded with quartz sand particles of dp=353μm.This inert material was previously heated by the combustion of liquefied petroleum gas up to the ignition temperature of the fuel mixture. The CFBC unit has a 100mm internal diameter riser, 4.0m high, as well as a 62.8mm internal diameter downcomer. The loop has a cyclone, a sampling valve to collect particles and a 62.8mm internal diameter L-valve to recirculate the particles in the loop. A screw feeder with a rotation control system was used to feed the fuel mixture to the reactor. The operational conditions were monitored by pressure taps and thermocouples installed along the loop. A data acquisition system showed the main operational conditions to control. Experimental tests performed put in evidence the problems found during bed operation, with special attention to the solids feed device, to the L-valve operation, to particle size, solids inventory, fluidized gas velocity, fuel mixture and recirculated solids feeding positions.
circulating fluidized bed coal combustion operational control L-valve solid feed operation
Jhon Jairo Ramírez Behainne Rogério Ishikawa Hory Leonardo Goldstein Jr AraíAugusta Bernárdez Pécora
Department of Thermal and Fluids Engineering,School of Mechanical Engineering,University of Campinas Department of Thermal and Fluids Engineering,School of Mechanical Engineering, University of Campina
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
224-230
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）