Low-oxynitride and low-load stable combustion device of turbulent combustor

Abstract

The invention belongs to the technical field of turbulent combustors of power plants, and in particular relates to a low-oxynitride and low-load stable combustion device of a turbulent combustor. The stable combustion device comprises two parts, namely, a ramming member and a vortex suppression member, wherein the ramming member is in a conoid structure, and the vortex suppression member is a streamlined structure body formed by two circular-arc surfaces. The stable combustion device is arranged near an outlet of a primary air pipe of the turbulent combustor; and when pulverized coal airflow passes through the stable combustion device, pulverized coal particles are gathered towards an outer ring of the primary air pipe, therefore the pulverized coal concentration is improved, the generation amount of NOx is effectively reduced, ignition heat is reduced, and timely ignition and stable combustion of the pulverized coal airflow under the conditions of low load and combustion of fault coal are facilitated. In addition, by means of the vortex suppression member of the stable combustion device, vortexes at the tail part of the stable combustion device can be effectively prevented from being formed, and the combustor can be prevented from slag-bonding, coking and burning-out.

Description

technical field [0001] The invention belongs to the technical field of swirl burners in power plants, and in particular relates to a low-nitrogen oxide and low-load stable combustion device for swirl burners. Background technique [0002] Due to the rise of domestic coal prices, most power plants have switched to low-quality coal with low calorific value. The stable combustion performance of the swirl burner, especially the low-load stable combustion capability, has deteriorated. It is difficult for pulverized coal to ignite, the combustion is unstable, and even fire extinguishing occurs , Seriously endanger the safe and economical operation of the boiler. At present, the measures to improve the stable combustion performance of the swirl burner mainly include: adding a concentration ring, improving the shape of the center flare, adding a stable combustion tooth or a stable combustion ring, etc. [0003] The concentration ring is generally installed in the primary air duct w...

AI Technical Summary

Problems solved by technology

[0009] The disadvantages of the tooth-shaped or petal-shaped burner: First, when the flaring design is large, it will guide the pulverized coal airflow to diffuse outwards, causing the pulverized coal airflow to mix with the secondary air prematurely, which affects the ignition and stable combustion of the pulverized coal. When the pulverized coal airflow velocity is high, the probability of the pulverized coal particles colliding with the surface of the burner increases, so that the pulverized coal particles are easily separated from the airflow and cause incomplete combustion loss

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