Thick and thin back mixing swirl pulverized coal burner

Abstract

The invention provides a thick and thin back mixing swirl pulverized coal burner. The thick and thin back mixing swirl pulverized coal burner includes a swirl pulverized coal concentration structure,a thin pulverized coal airflow chamber structure, a first- level mixed reflux cavity structure, a secondary air chamber structure and a two-level mixed jet cavity structure, wherein the swirl pulverized coal concentration structure is provided with a primary air pulverized coal airflow inlet tube, a thin pulverized coal airflow outlet tube and a thick pulverized coal airflow outlet tube, the thinpulverized coal airflow chamber structure is used for guiding the thin pulverized coal airflow, the first-level mixed reflux cavity structure communicates with the thick pulverized coal airflow outletpipe and the thin pulverized coal airflow chamber structure, the secondary air chamber structure is partly arranged on the first-level mixed reflux cavity structure in a sleeving mode, the two-levelmixed jet cavity structure communicates with the secondary air chamber structure, and the two-level mixed jet cavity structure is used for jetting the flame produced by the combustion of pulverized coal in the first-level mixed reflux cavity structure. The primary air pulverized coal airflow passes through the swirl pulverized coal concentration structure so as to achieve high-efficiency concentration of the pulverized coal, the thick and thin back mixing and classification combustion of the pulverized coal in the burner are achieved, the ignition and stable combustion of the pulverized coalare facilitated, and meanwhile, the Nox generated in the pulverized coal combustion process is reduced.

Description

technical field [0001] The invention relates to the technical field of pulverized coal combustion equipment, in particular to a thick-thin back-mixed swirl pulverized coal burner. Background technique [0002] In my country, coal-fired industrial boilers are the main coal-fired equipment except power plant boilers. Traditional coal-fired industrial boilers are mainly layer-fired grate furnaces and chain furnaces, that is, lump coal is placed on a fixed or moving grate to form a fuel layer, and air enters from the bottom of the grate and flows through the fuel layer for combustion reaction. . Limited by the combustion space and the effective reaction area, this type of furnace generally has the problem of low boiler thermal efficiency. [0003] In recent years, with the continuous development of pulverized coal processing, transportation, storage and combustion technology, chamber combustion of pulverized coal has gradually replaced pulverized coal bed combustion, and has b...

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Problems solved by technology

[0005] Based on this, it is necessary to address the pulverized coal burnout of industrial pulverized coal boilers, the poor combustion stability at low loads and the NO x To solve the problems of high emissions, provide a kind of coal powder that is conducive to ignition and reduce NO x Rich-lean back-mixed swirl pulverized coal burner with strong low-load stable combustion capability

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