Sidewall dominated symmetric combustion low-nitrogen and high efficiency burnout W flame boiler

Abstract

The invention discloses a sidewall dominated symmetric combustion low-nitrogen and high efficiency burnout W flame boiler. Furnace arches (arranged burners), staged air and throat over fire air are disposed at the left wall side and right wall side, and exhaust gas burners and wall over fire air are disposed at the front wall side and back wall side. The condition of "symmetric action of the upperhearth asymmetric structure effect on descending pulverized coal air flow", the suppression of a high-depth furnace arch on the upper hearth flue gas flow backward inclination behavior, and the clamping effect of fine pulverized coal flue gas flow from exhaust gas burners and wall over fire air on the ascending W flame backward inclination behavior are utilized to construct the sidewall dominatedsymmetric combustion W flame combustion condition. Symmetric combustion allows intensified stage combustion and reduces local high temperature zone, the fine pulverized coal flue gas flow from exhaust gas burners is organized for re-combustion, and a burnout zone couples with the throat over fire air and the wall over fire air, thus constructing the deep low-nitrogen combustion condition. Symmetric combustion ensures equal burnout on the left and right side, and the fine pulverized coal flue gas flow and wall over fire air reinforce the air flow disturbance and material mixing at the later stage of combustion, thus constructing the high efficiency burnout condition.

Description

technical field [0001] The invention relates to a W-flame boiler, in particular to a low-nitrogen high-efficiency burn-out W-flame boiler with side walls dominated by symmetrical combustion, and belongs to the technical field of W-flame boiler combustion. Background technique [0002] W flame boilers have been widely used in my country in the past 30 years. This kind of boiler feeds down-injected pulverized coal airflow through the front and rear arch burners, and gradually feeds the secondary air and graded air required for combustion along the flame stroke, so as to organize symmetrical W flame combustion along the furnace depth direction and rely on staged combustion. Control NOx emissions. However, the existing performance shows that the combustion in most W-flame boilers apparently deviates from the design concept of constructing a symmetrical W-shaped flame, showing asymmetrical combustion characteristics with good combustion on one side and significantly poor combust...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that have not been involved in the background technology (that is, comprehensively solve the asymmetric combustion and significantly reduce NOx emissions without significantly increasing the cost of the boiler body, while maintaining good burnout), and then provide a side boiler. Low-nitrogen high-efficiency burn-out W-flame boiler with wall-dominated symmetrical combustion

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