Process and burner for the thermal disposal of pollutants in process gases

A burner (1) for generating a flame (2) in a combustion chamber (19) for burning perfluorinated compounds in an industrial gas, comprising:

• a feed line (3) for a fuel gas to be fed into the combustion chamber (19);
• a feed line (4) for oxygen to be fed into the combustion chamber (19);
• a feed line (20) for the industrial gas to be fed into the combustion chamber (19);
• an ignition apparatus (7) for igniting the gas mixture present in the combustion chamber (19);
• another feed line (5) for admixing a diluent gas into the fuel gas before the fuel gas and the diluent gas are introduced into the combustion chamber (19), wherein the additional feed line (5) for the diluent gas opens up in the feed line (3) for the fuel gas, and wherein the feed line (3) and the additional feed line (5) are separate from the feed line (20) for the industrial gas;
• and
• a process installation (26) that communicates the presence of perfluorinated compounds in the industrial gas prior to introduction into the combustion chamber (19), wherein the feed of the diluent gas is reduced, substantially discontinued or entirely discontinued when the industrial gas contains perfluorinated compounds.

A method for burning off perfluorinated compounds entrained in an industrial gas, comprising:

• feeding the industrial gas into a combustion chamber of a burner;
• mixing a diluent gas with a fuel gas to form a gas mixture, wherein said diluent gas reduces calorific value of the gas mixture relative to the calorific value of the fuel gas alone, and wherein throughput of the diluent gas as a function of the composition of the industrial gas is regulated in order to adapt the diluent gas and fuel gas mixture to a predetermined calorific value to burn off the perfluorinated compounds in the industrial gas so that the feed of the diluent gas is reduced when the industrial gas contains perfluorinated compounds,
• wherein if the industrial gas contains tetrafluoromethane (CF4), the feed of the diluent gas is discontinued;
• feeding the diluent gas and fuel gas mixture via a feed line separate from the industrial gas into the combustion chamber;
• separately feeding oxygen into the combustion chamber;
• and
• then igniting the fuel gas in order to generate a flame for burning off the perfluorinated compounds of the industrial gas in the combustion chamber.