Method and device for regulating the sand discharge during the thermal regeneration of old foundry sand in fluidized bed furnaces

摘要

The invention relates to a process for controlling the drag-out of sand, via an outlet tube arranged on the opposite side of a fluidised bed separator (furnace) to a sand feed, in the thermal regeneration of foundry sand, the bottom of the fluidised bed separator having openings through which hot gases pass into the fluidised bed. The process is characterised in that the emergence of sand from the outlet tube (4) is eased by increasing the air supply through the openings in the bottom (7) of a pneumatic conveyor (5) connected to the outlet of the fluidised bed separator (1), thereby reducing the cone (6) of sand which has formed between the end of the outlet tube (4) and the bottom (7) and thus freeing the outlet of the outlet tube (4). IMAGE