Study on activated carbon preparation in multiple hearth furnace based on heat balance technology

in orderto study technical ontrol principle and statility facor in production of the multple hearth urnace and provide key parameters to industrialized unit for activated caoo preparation.echnology of activated caroon prepared were studtied in 50 kg i h mutiple hearth funace which maintained heat balance mainly basing on activation enothemic reaction and exothemic combustion reactions. The resuts showed that increasing caronized materalresidence time could promote adsopton property of activated cabon products to a certain extent When caroonized materalresidence time beyond eight hours could cause overburning and reducing ofadsorpton properies.Increasing the pressureof steam into funace of changing furnace pressure from micro-negative prssure to micro-positive pressure could not improve adsoption property of activated caroon productsDecreasing steam ij ction ino activated lay er and reguating injecion air alves rase the maximum temperatureof activated layer ino 952 'C.Ey promoting temperature of activated layer could produce acivated carbon which iodine adsorption value beyond 930 mg / g.