Cooling device

A cooling device for cooling coal dust or other fine particulate material both from its bottom and its top comprising a housing having a plurality of vertically arranged and secured housing sections of which the uppermost housing section is covered, a motor-driven conveyor device mounted in said housing to transport the coal dust or particulate material from one or more inlets to one or more outlets over the coolable bottom of the housing, the housing having a circular cross-section and a plurality of coolable tray members spaced one above another disposed in the housing, said tray members each being provided with cooling means arranged on their bottom sides and each tray member having associated therewith a conveyor wheel arranged to move over it, the wheels being connected to a common motor-rotatable shaft arranged vertically and coaxially with respect to the housing, each tray member having at least one outlet arranged alternately at the center of the tray member and adjacent an outer housing shell and the conveyor wheels being shaped to convey material from an inlet in the cover of the housing and/or from an outlet in the uppermost tray to an outlet of the lowermost tray, each tray member in each housing section being provided on its bottom side with a chamber traversable by cooling agents and which communicate with each other by pipelines.