Tail edge backflow dual-classification low-nitrogen-oxygen gas burner

Abstract

The invention provides a tail edge backflow dual-classification low-nitrogen-oxygen gas burner which comprises an air box assembly. A smoke backflow fin ring is arranged at the upper end of the air box assembly. A center gas nozzle is arranged in a center air channel in the air box assembly and provided with a rotational flow flame holder. A coaxial air adjusting barrel is installed at the upper portion of the air box assembly. A coaxial cold air barrel is arranged at the lower end of the center gas nozzle. A combustion-supporting air distribution barrel is arranged at the lower portion of the air box assembly. A gas inlet is formed in the center of the bottom of the air box assembly. Constant-temperature combustion-supporting air inlets are formed in the two sides of the gas inlet and a high-temperature combustion-supporting air inlet is formed in one side. Under the same working condition, when the tail edge backflow dual-classification low-nitrogen-oxygen gas burner of the structure is adopted for reaching the standard of CO emission, the content of NOx can be reduced by over 65% compared with that of a conventional burner. When the temperature of combustion-supporting air is 270 DEG C, the emission amount of NOx can be reduced to average 138 mg / Nm<3> from 400 mg / Nm<3>.

Description

technical field [0001] The invention belongs to the technical field of burners, in particular to a trailing edge recirculation double-staged low-nitrogen and oxygen gas burner with high-temperature combustion-supporting air. Background technique [0002] The low nitrogen oxygen gas burner is a type of burner that appears to reduce the emission of nitrogen oxides in the combustion products. After the conventional burner is modified to improve the thermal efficiency of the heating furnace, the emission of nitrogen oxides often exceeds the national environmental protection level as the temperature of the combustion air increases. emissions requirements. [0003] In the design of conventional gas burners, in order to ensure full combustion, most of them adopt the design method of uniform distribution and rapid combustion of combustion-supporting air and fuel gas, while low-nitrogen gas burners are designed to reduce the flame temperature while avoiding local burnout. In the hig...

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Problems solved by technology

[0004] At present, the usual low nitrogen oxide burner is relatively easy to achieve low nitrogen oxide emissions under the condition of low combustion air temperature (≤180°C) and low furnace temperature (≤800°C), (≥250°C) and high furnace temperature (≥800°C), even if the emission of nitrogen oxides is significantly increased, it is difficult to meet the national environmental protection emission requirements

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