Low-nitrogen burner

Abstract

The utility model relates to the technical field of combustors, and discloses a low-nitrogen combustor, which is characterized in that the coefficient of excess air of a primary air nozzle in a main combustion chamber is set to be 0.25-0.8, so that fuel gas and air in the main combustion chamber are fully combusted through primary rich fuel, and the oxygen content of combustion products is reduced; part of primary fuel-rich flames diluted and ejected by flue gas in the main combustion chamber are ejected through a flame nozzle, the temperature is reduced, the flue gas is entrained through high-speed secondary air jet flow to dilute the oxygen concentration in the air, and the flue gas and the primary fuel-rich flames are mixed in a long distance in an included angle delay mode for further combustion to form secondary combustion flames; according to the invention, the first-stage rich fuel is slowly carried out at a low temperature in the secondary combustion process, the generation of nitrogen oxides is effectively inhibited, the first-stage combustion is combined into a rich fuel mode, the sufficient combustion of the fuel is ensured, and the oxygen content of the combustion product is reduced to 100 ppm or below after the combustion is finished, so that the generation of thermal NOx is reduced, and the efficient low-nitrogen combustion is realized.

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