Importance

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Abstract

A thermal post-combustion device for the purification of exhaust air comprises an outer housing surrounded by an insulating jacket, a combustion chamber bounded by a combustion chamber housing and arranged within the outer housing, and a burner chargeable with fuel and that comprises a burner nozzle and a first flame tube that surrounds the burner nozzle and connects the space between the outer housing and the combustion chamber housing to the combustion chamber. The burner includes at least one further flame tube that is arranged completely within the combustion chamber, and the end of the first flame tube lying inside the combustion chamber is surrounded by a further flame tube of larger radius so as to form an annular gap between the first flame tube and the further flame tube. In this way a circulating flow of the combustion air becomes possible inside the combustion chamber, which flow is guided repeatedly through the annular gap and the flame of the burner. This improves the completeness of the combustion and produces a uniform temperature within the combustion chamber, with the result that the post-combustion device can be operated at a lower flame temperature.

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First Claim