Rotary burner with internal recirculation

Abstract

This utility model relates to fuel combustion systems and can be used to reduce nitrogen oxide emissions. An additional peripheral gas channel with gas distribution tubes is installed on a burner installed on a fuel combustion system or a new burner. These tubes extend the gas distribution chambers with gas outlets into the furnace beyond the airflow along the perimeter of the embrasure. The burner comprises an air box, a vane assembly, an annular gas manifold with gas outlets, forming an air channel. A fuel oil nozzle is positioned along the burner axis under a rotary fuel oil nozzle. As a result of the burner's insertion, gas jets flowing from the gas outlets into the space filled with flue gases eject flue gases directly from the furnace and ensure dilution of the gas with flue gases before mixing with the airflow and ignition. Reducing the concentration of reactants and the combustion temperature reduces NOx emissions.A baffle plate may be installed on the gas distribution chamber with gas outlet openings on the burner axis to reduce air suction from the burner to the root of the gas stream exiting the gas outlet opening. The number, location, and angle of the gas outlet openings, as well as the type of gas distribution chamber, depend on the burner power, the aerodynamic characteristics of the burner airflow, and the gaseous fuel pressure. The proposed burner reduces nitrogen oxide emissions by 40-70% during gas combustion. An advantage of the proposed utility model is the ability to reduce NOx emissions during gas combustion without modifying the combustion unit's furnace components or reducing the technical and economic performance of the fuel combustion unit. 1 ref. fil., 2 fig.

Images