Exhaust gas treatment device with a burner for generating a flame for the combustion of process gas

A waste gas treatment device (22), comprising:

• a combustion chamber (32) that has at least one feed (16) through which a process gas to be thermally treated is introduced into the combustion chamber (32) and at least one discharge (31) from which thermally treated waste gases are discharged out of the combustion chamber (32);
• and
• at least one burner (1) for generating a flame (33) for the combustion of process gas in the combustion chamber (32) comprising:
• feed lines (5, 6) for a fuel gas and for an oxidizing agent configured so that the fuel gas and oxidizing agent flow into a pre-mixing chamber (12) to form a gas mixture, wherein each of the fuel gas and the oxidizing agent are fed into the pre-mixing chamber (12) of the burner (1) in a substantially cylindrical pipe (2, 3) configured as outer (2) and inner (3) pipes of different lengths that are concentric relative to each other with the outer pipe (2) extending axially beyond the length of the inner pipe (3), and with the fuel gas being carried in one of the outer pipe (2) or in the inner pipe (3), and the oxidizing agent being carried in the other of the outer pipe (2) or in the inner pipe (3), wherein the inner pipe (3) and the outer pipe (2) each are electrically conductive, and wherein the premixing chamber (12) is within the outer pipe (2) at or near an outlet end of the outer pipe (2), and wherein the inner pipe (3) has a lower end,
• an insulator (7) configured to electrically insulate the inner pipe (3) from the outer pipe (2),
• an ignition device (10, 11) for igniting the gas mixture contained in the pre-mixing chamber (12), wherein the ignition device (10, 11) has at least one projection (10) arranged on the lower end of the inner pipe (3) and oriented towards an outlet of the burner (1) in order to generate an ignition spark from the inner pipe (3) to the outer pipe (2) in the pre-mixing chamber (12), and
• a sensor (4) for detecting and/or monitoring the flame (33) arranged at one end of the burner (1) situated opposite from the pre-mixing chamber (12).