COMBUSTION HEAD WITH LOW EMISSION OF NOx FOR BURNERS AND BURNER COMPRISING SUCH A HEAD

摘要

A combustion head for burners, comprising an outer tubular body for channeling combustion air, an inner tubular body for channeling a fuel and a diffuser extending between the inner tubular body and the outer tubular body, said diffuser being disc-shaped and defining a slot for passage of the air between said diffuser and the outer tubular body. The outer tubular body has a lip 15 converging towards the main axis at the emission portion so as to define a narrowing of said slot for passage of the combustion air, so that for predefined flow rates of fuel and combustion air, the ratio of the velocity of the exiting fuel to the velocity of the combustion air exiting from the passage slot ranges between 1.8 and 3.