PRODUCTION OF ACTIVATED CHAR USING A MOVING GRATE STOKER FURNACE

摘要

Carbonaceous material is deposited so as to form a bed on a grate moving horizontally through a hot furnace, the furnace having a zoned airbox beneath the grate. Hot combustion by-product gases are downdrafted through the bed as it passes over airbox zones which are disposed towards the entrance end of the furnace so as to dry and ignite the material and sweep off volatiles therefrom. Air and steam and next air alone and finally steam is fed upwardly through the bed as it progresses beyond the downdrafted zones. Over the bed at the end of the grate run, the downdrafted gases are injected back into the furnace above the bed and burned, and finally the then charred material is quenched by a water spray.