Patent ID: 7942666

Claim:
An apparatus for burning organic substances, comprising a horizontal combustion chamber provided in a housing and heat-insulated against said housing, and a counter-flow heat exchanger which preheats the combustion air with the help of the hot exhaust gases from the combustion chamber and which forms a flow duct for the combustion air between the combustion chamber and a heat-exchanger wall enclosing the combustion chamber, as well as a flow duct for the hot exhaust gases on the side of the heat-exchanger wall averted from the combustion chamber, wherein the heat-exchanger wall ( 9 ) of the counter-flow heat exchanger ( 8 ) is provided on the outside of the heat insulation ( 3 ) of the combustion chamber ( 2 ) which comprises an upper exhaust outlet ( 7 ) opening into the housing ( 1 ), that heat exchangers ( 6 ) which extend parallel to the combustion chamber ( 2 ) are provided for the heating of a heat-transfer medium with the sensible waste heat of the hot exhaust gases in the upper interstices ( 4 ) obtained on either side of the cylindrical combustion chamber ( 2 ) between the combustion chamber ( 2 ) and the substantially prismatic housing ( 1 ), and wherein the exhaust-gas-receiving flow duct ( 11 ) of the counter-flow heat exchanger ( 8 ) for the exhaust gases originates from the two interstices ( 4 ), while the heat-exchanger wall ( 9 ) extends with the flow duct ( 10 ) for the combustion air into the interstices ( 4 ).