Ultralow NOx pulverized coal burner

Abstract

The invention discloses an ultralow NOx pulverized coal burner. The ultralow NOx pulverized coal burner comprises a secondary air box, an electric gate damper, a primary air pipe, a secondary inner air pipe and a secondary outer air pipe, wherein the primary air pipe, the secondary inner air pipe and the secondary outer air pipe are arranged coaxially; an inner secondary air chamber and an outer secondary air chamber are arranged in a secondary air box; one end of the inner secondary air chamber is communicated with an inner secondary air flue between the primary air pipe and the secondary inner air pipe, and the other end of the inner secondary air chamber is provided with a first return flow air opening and an inner secondary air opening; one end of the outer secondary air chamber is communicated with an outer secondary air flue between the secondary inner air pipe and the secondary outer air pipe, and the other end of the outer secondary air chamber is provided with a second return flow air opening and an outer secondary air opening. Low-oxygen air with different concentrations is conveyed in a classified mode through the two air flues, the oxygen concentration of a combustion area and the peak value temperature of flame are lowered as much as possible, pulverized coal is combusted in an oxygen debt mode, and the environment of the combustion area is in reduction atmosphere. An oxygen-lack rich-fuel area is formed at the root of the flame, generation of NOx is effectively reduced, low NOx emission is achieved, and the environment protection requirement is met.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to a burner with stable combustion and ultra-low NO which is suitable for use in industrial pulverized coal boilers. x Discharged bottom swirl burners. Background technique [0002] my country's energy structure is still dominated by coal, and industrial coal-fired boilers account for a large proportion of energy consumption. Most of the existing coal-fired industrial boilers are layer-fired boilers with chain grates, and the operating efficiency is low. The pulverized coal industrial boiler fired in the suspension chamber has a very high energy utilization rate. In traditional pulverized coal combustion devices, it is mostly used in large boilers for power generation boilers, and cannot be directly used in small and medium-sized industrial pulverized coal boilers. Develop a kind of coal powder suitable for small and medium-sized industrial pulverized boilers, which can stably and effi...

AI Technical Summary

Problems solved by technology

In traditional pulverized coal combustion devices, it is mostly used in large boilers for power genera

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