Enriched multiple straight-through powder coal burners

Abstract

A multi-enrichment direct-flow pulverized coal burner relates to a pulverized coal thick-lean burner arranged tangentially at four corners. The feature of the present invention is that a wedge-shaped partition is installed in the concentrated air flow of the nozzle of the burner, and a zigzag multi-strand small nozzle is provided at the outlet of the dense coal powder of the nozzle, and 2-3 small nozzles are arranged in the square channel of the primary air. Separate the block. The burner uses the stable combustion mechanism of a small flame to ignite a large flame, and uses the zigzag multiple small nozzles to guide the high-concentration pulverized coal flow to the high-temperature area of ​​the flue gas on the fire side, so that it can be heated to the ignition condition first, forming a small flame. Make this small flame ignite other pulverized coal airflow, and form a large flame at a certain distance from the nozzle, thereby effectively improving the stable combustion ability of the burner, and reducing the size of the nozzle, which is beneficial to the layout of large-capacity boiler burners , it is not only conducive to ignition and stable combustion, but also beneficial to reduce NOx emissions and slagging and high-temperature corrosion of the water wall in the combustion zone.

Description

technical field [0001] The invention relates to a direct-flow pulverized coal burner, in particular to a pulverized coal thick-lean burner arranged tangentially at four corners, and belongs to the technical field of combustion equipment. Background technique [0002] For pulverized coal boilers in power stations, the realization of a rich-lean combustion technology (i.e., rich-poor powder combustion technology) has been proved in theory and practice to solve the problem of stable combustion in the furnace, realize low-load oil cut-off and peak-shaving, and reduce NOx in the furnace. x It is a good way to prevent slagging in the furnace and improve the adaptability of coal types. Most of the thick-lean combustion technology is to divide the pulverized coal airflow in the primary air duct into two streams, thick and thin, and send the thick pulverized coal airflow to the space where it is easy to catch fire (such as the high-temperature recirculation area or the fire side of t...

AI Technical Summary

Problems solved by technology

However, this structure requires a large nozzle area, and it is difficult to arrange large-capacity boilers (units above 200MW); in addition, when the coal type changes greatly, it is easy to cause the temperature of the nozzle to be too high, which will affect the service life of the nozzle

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