Burner with two-layer vortex countercurrent flow
An invention relates to devices for combustion of gaseous fuels, in particular to vortex burners. The technical result consists in simplification of the burner design, allowing to reduce the temperature of the inner surface of the flame tube and, thus, to eliminate the need for expensive thermal protection coating, as well as in improving the stabilization of the combustion process and implementation of the possibility of combustion at higher excess air factors (poor mixtures) due to the formation of a countercurrent vortex flow inside the flame tube. The burner with the two-layer vortex countercurrent flow contains a cylindrical burner body, a flame tube, and a nozzle coaxially installed therein, wherein an air duct is provided between the burner body and the flame tube; the flame tube contains a front wall having an inlet window and a rear wall having the nozzle; the burner body contains an inlet window fuel feeder, whereas the air duct at the inlet window contains a swirl nozzle, with an additional swirl nozzle and an additional fuel feeder located at the rear wall, and the nozzle is partially placed inside the flame tube.
1. A burner with a two-layer vortex countercurrent flow containing:
a cylindrical burner body;
a flame tube;
wherein (i) the flame tube is installed with a gap to the burner body, forming an air duct configured to supply an air to the flame tube; (ii) the flame tube contains a front wall having an inlet window with an inlet window fuel feeder installed therein; (iii) the air duct at the inlet window is connected to a first swirl nozzle configured to create a near-axis vortex flow inside the tube, and (iv) the flame tube further comprises at least one second swirl nozzle connected to the air duct and at least one additional fuel feeder located at a rear wall, said second swirl nozzle being configured to form a peripheral vortex flow inside the flame tube, the direction of the peripheral vortex flow being opposite to the direction of the near-axis vortex flow.