Abstract: The invention relates to firing technology and can be employed in the combustion of hydrocarbon fuel in gas turbine plants, gas-steam plants, boilers, and other thermal plants. The fuel and the air enter the combustion chamber via a fuel-air inlet port. The delivery of fuel can be done by means of injecting the liquid or gaseous fuel via a nozzle. The fuel-air mixture occurs in the inlet port. Upon the tangential entrance of the fuel-air mixture from the inlet port into the combustion chamber, the swirl is effected in the combustion chamber, and the mixture is combusted. The combustion residues, because of the disposition of the inlet port at a tangent to the combustion chamber, are set into rotary motion. The hollow cone is oriented and disposed with its tip toward the combustion chamber and contributes to forming a swirl angle of the combustion residues. A confusor increases the flow resistance, and consequently the pressure in the combustion chamber increases.