Horizontal dense-dilute concentration type direct flow pulverized coal burner

Abstract

A horizontal gradation rich direct-flow coal-powder burner is provided, which relates to a coal-powder gradation burner with four corners arranged tangentially. The invention is characterized in that, the air flow of the primary air coal powder is separated by gradation, at the outlet of the channel for the thicker air flow, a stage-I separating block and a stage-II separating block for thicker whiff are provided so as to separate the air flow with thick powder into upper, middle and lower whiffs; the nozzle structure uses a nozzle structure for rich thick whiff. The ignition process is completed in three stages. The invention not only reduces the firing heat necessary for firing, is good for firing and burning, but also solves the low-load de-oiling steady burning when a 300-600MWe boiler burns difficult-to-burn coal; is especially suitable for 100, 200, 300 and 600MWe boilers to burn low-quality bituminous coal, poor coal, semi anthraciferous coal and anthraciferous coal as well as suitable for rebuilding the said boilers, also is good for reducing the emission of NOx and eliminating slagging scorification and corrosion under high temperature of the water-cooled wall in the burner area.

Description

technical field [0001] The invention relates to a direct-flow pulverized coal burner, in particular to a thick-lean burner arranged horizontally on a four-corner tangential coal-fired boiler, which belongs to the field of combustion equipment and technology. Background technique [0002] In pulverized coal boilers, thick-lean combustion (or poor-rich powder combustion) technology is often used, that is, the pulverized coal / air (primary air) airflow entering the furnace is inertially separated, divided into two streams, thick and thin, and then sent to the furnace respectively. Since the pulverized coal concentration of the concentrated strand is significantly higher than that of the original primary air, its ignition characteristics have been significantly improved. The horizontal thick-lean combustion technology is a kind of thick-lean combustion technology. The two airflows after the separation of the thick and thin air are sent into the furnace in the same horizontal dire...

AI Technical Summary

Problems solved by technology

The reason is that the existing enrichment burner is a kind of upper and lower thick-lean burner, and its nozzle is large, so it is often necessary to use two primary air nozzles in combination, and the large unit boiler often needs to swing the whole group when the burner is adjusted. , there are great technical difficulties in merging two spouts or using an oversized spout

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