Patent ID: 8281584

Claim:
A wood-pellet cogeneration unit, comprising a pellet feed, a combustion chamber, an ash removal device and a stirling engine, characterized in that an exhaust gas recuperator preheats combustion air and wood pellets are gasified with a portion of said hot air; said portion of the hot combustion air is directed above a grate in a gasification combustion chamber and the fuel gas thus produced is sucked downwards through the grate together with the ash by a side channel blower; the fuel gas under the grate is displaced with a flow impulse of the remainder of the hot combustion air that firstly a low lambda value close to the CO limit is maintained and, depending on the temperature of the combustion chamber, the combustion at the central nozzle is stabilized or, with increasing temperature of the combustion chamber, the state of flameless combustion is increasingly obtained, wherein a potential vortex is produced in the combustion chamber, which vortex intensively mixes exhaust gas, fuel gas and hot combustion air, so that fuel gas and ash particles will burn completely.