Vortex combustor of coal fines circumferential direction concentration sectional stopping whorl

Abstract

The present invention provides a vortex combustor of coal powder circumferential compression space-sharing standing vortex, comprising a center air duct, a primary air duct, an internal secondary air duct and external secondary air duct arranged on periphery of a the center air duct from inside to outside in turn, a circumferential compression stream apparatus arranged inside secondary air duct, and a wedge-shaped circulation reflux standing vortex steady combustion body arranged at tail of the circumferential compression apparatus. After the primary air flows through the circumferential compression stream apparatus and the circumferential compression stream apparatus, the opening of the combustor forms an evident coal powder circumferential shade section and a strong standing vortex steady on-combustion section, and combustion condition of high temperature whirling current flue gas and poor-oxygen rich-fuel. Great on-combustion stabilization is provided. The invention is especially suitable for combustion of meagre coal, kilkenny coal and coarse coal, and for improving combustion flame stabilization of various coal.

Description

technical field [0001] The invention relates to a pulverized coal burner for a boiler, in particular to a pulverized coal circumferentially concentrated zone vortex swirl burner. Background technique [0002] The swirl burner is widely used in power plant boilers in my country. The swirl burner mainly relies on the strong rotation of the primary air flow and the secondary air flow to form a large and stable rotating return area at the burner outlet. The high temperature flue gas backflow ignites the pulverized coal. Due to the frequent changes in the quality of coal fired in power plants in my country, many problems such as delayed ignition of the original burner, unstable combustion, excessive water spraying of the reheater, and difficulty in igniting low-quality coal cannot be effectively resolved. . [0003] There are many new swirl burner structures. In order to solve the problem of low-quality coal ignition, it is generally used to increase the swirl strength of the pri...

AI Technical Summary

Problems solved by technology

[0005] Chinese Invention Patent 03134317.1. "A Radial Concentration and Thinness Double Adjustable Wind Swirling Pulverized Coal Burner" proposes the technology of adding inner and outer tooth-shaped stable combustion rings at the burner nozzle. On the basis of the primary air ring, a stable combustion ring is arranged on the inner ring to improve the stability of combustion, but this patent does not use the thick-thin separation technology, and the air supply method of the pulverized coal flow has not fundamentally changed.

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