Patent ID: 7797854

Claim:
An apparatus for the treatment of particulate material, comprising a first process chamber of circular cross-section for the reception and treatment of a particulate material, said process chamber having: a bottom provided with passage orifices through which a process air can be introduced into said process chamber, and an outlet for the discharge of said process air from said process chamber, a device for conditioning said process air and for circulating said process air in a circuit through said process chamber, said outlet and back to said bottom, said device having at least one fan for circulating said process air, at least one annular condenser, and at least one process air heater, wherein a filter arrangement is provided for removing solids from said process air flowing out of said process chamber, said filter arrangement is arranged upstream of said device for conditioning said process air, and wherein a second annular chamber is provided which entirely surrounds said first circular process chamber, wherein said at least one fan and said at least one process air heater are arranged below said bottom of said process chamber, and wherein an annular filter of said filter arrangement and said at least one annular condenser are arranged in said second annular chamber surrounding said process chamber.