Slagging-resistance and high temperature resistance coal powder burning device used in vertical strong/weak combustion boiler

Abstract

A coal powder burner can avoid scale and high-temperature corrosion in vertical gradient burning boiler, wherein a back side d1 of dense first injector is fixed with a dense secondary injector, the dense first airflow and the axis of the dense second airflow have a corner at beta 1, a dilute second airflow can be arranged at the back of the dilute first injector. The two airflows can improve the injection rigidity to confirm the oxidization condition near the water cooling wall and reduce the temperature near the water cooling wall, to avoid scale and high-temperature corrosion. The invention can arrange space or baffle between the dense first injector and the dense secondary injector, to reduce the mixing between the dense first airflow and the dense secondary airflow.

Description

technical field

[0001] The invention relates to a pulverized coal boiler combustion device. Background technique

[0002] At present, water wall slagging and high temperature corrosion are common in large pulverized coal power plant boilers, especially in boilers using vertical thick-lean combustion technology. These slagging and high-temperature corrosion problems not only damage the boiler and affect production, but also threaten the personal safety of production operators.

[0003] The vertical thick-thin combustion technology is to classify the primary air in the height direction to form a thick primary air and a light primary air. When the thick primary air burns, the heat of ignition is reduced, the heat release is concentrated, the burning speed is fast, and the blackness of the ignition area is large. , is conducive to radiation heat transfer, high combustion intensity, and fast flame propagation speed. These factors are conducive to the ignition and combustion of p...

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