Patent ID: 8851062

Claim:
A combustion device comprising: a combustion chamber including an inner wall defining a combustion space that contains, and is in communication with, a biomass fuel source and an outer wall defining an interface port allowing access of airflow into an annular combustion air plenum defined between the inner wall and the outer wall to introduce combustion air into the combustion chamber through a plurality of circumferentially distributed ports in the inner wall, the outer wall having a deflector imparting a rotational airflow around the combustion chamber, the annular combustion air plenum having an outlet at a top end thereof for escape of combustion gasses and application of heat to an object; a thermoelectric generator (TEG) located outside the outer wall and including at least one thermally connected heat-conducting probe on a hot side thereof that extends into the combustion space, the TEG further including a heat sink thermally connected to a cold side thereof; and a motorized airflow driver electrically connected to the TEG and constructed and arranged to drive air from an ambient source, over the heat sink and through the interface port and the annular combustion air plenum so as to generate a positive pressure in the combustion space.