Pulverized coal burner

Abstract

A pulverized coal burner comprises at least one cyclone with a primary air powder tangential inlet line and a middle tapered shrinkage segment; an exhaust gas pipe having an exhaust gas adjusting air door and inserted on the top of the cyclone; a primary pulverized coal burning chamber and a secondary pulverized coal burning chamber arranged on the straight outlet segment of the cyclone; a micro-oil oil gun arranged on the top of the cyclone and inserted and penetrating the inlet of the exhaust gas pipe to the inlet of the primary pulverized coal burning chamber; a concentration ring and a rotation-eliminating blade arranged outside the throat at the interface of the shrinkage segment and the straight outlet segment of the cyclone; and a secondary air nozzle arranged at the outlet of the secondary pulverized coal burning chamber. The pulverized coal burner can achieve burn a great amount of pulverized coal by strengthened combustion and gradual amplification of trace oil by adopting the technical measures, such as ignition using micro-oil gasification oil gun, secondary pulverized coal burning, adjustable exhaust gas flow rate and pulverized coal concentration ratio, further pulverized coal concentration and rotation elimination, thereby achieving ignition of anthracite and lean coal, and achieving high oil saving rate. The coal burner is particularly suitable for W-shaped flame boiler.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to a burner for a W-shaped flame boiler burning anthracite or lean coal, and belongs to the technical field of combustion technology and equipment. Background technique [0002] my country is one of the few countries in the world where coal is the main primary energy source. Since the ignition and combustion of coal is much more difficult than that of oil and gas, a large amount of fuel oil or gas is generally used for ignition and stable combustion under the conditions of boiler start-up and low-load operation. Although China's coal reserves are relatively abundant, the quality of coal varies greatly. In most parts of southern China, as well as parts of northern China, there are a large number of low-quality coal resources, especially anthracite and lean coal with high ash content and low volatile content. W-type flame boiler is currently one of the best technologies for anthracite and...

AI Technical Summary

Problems solved by technology

At present, the four-corner tangential circle arrangement of other conventional power station pulverized coal boilers and the micro-oil combustion system of the wall-arranged burners have become popular. However, due to the poor quality of coal used in W-type flame boilers, the burner structure is unusually special. Ignition and stable combustion are particularly difficult, and there is no precedent for the application of micro-oil combustion technology

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