In the burner device of two-stage combustion, the blowing air is divided into a primary, which passes through the shoulder apparatus, where the rotational movement takes place, and a secondary one that flows along the burner axis. As a result, two combustion zones are formed: I – combustion of the entire volume of fuel in a mixture with the primary peripheral rotating air with a lack of oxygen (a = 0,8), II – burning in the direct flow of air of incomplete combustion products after stage I. The reduction of the formation of nitrogen oxides is due to the creation of a regenerative environment at stage I, increasing the efficiency of combustion of fuel – increasing the completeness of this process.

The introduction of such burners can reduce emissions to the atmosphere: nitrogen oxides – by 20-40%, CO – by 20-50%. At the same time, the heat output of the boiler, the temperature of the waste gases and efficiency remain practically unchanged.

The modernized burner is convenient in handling and allows you to reduce the time of boiler transfer if necessary from burning gas to liquid (fuel oil) (developed version with the use of a quick insertion). The dimensional and fitting dimensions of these burners coincide with the standard sizes (for example, the type of RGMG), their installation does not require the reconstruction of vodka embrasures and air and fuel supply lines.

The cost of fabricating (converting a burner type RGMG) to one burner of two-stage burning is about 2 – 3 thousand US dollars.

Two-stage burners for the following boilers have been developed:
KV-GM-100; 50; 30; 20; 10;
PTVM-100; 50; 30
It is possible to develop individual solutions for other boilers.