Low air cooling volume burner adopting composite material nozzle

Abstract

The invention discloses a low air cooling volume burner adopting a composite material nozzle. The low air cooling volume burner comprises a central air channel and a pulverized coal pipeline, wherein a central air nozzle is arranged at the end part of the central air channel; a pulverized coal nozzle is arranged at the end part of the pulverized coal pipeline; the central air nozzle is provided with a central air nozzle metal section connected with the central air channel and a central air nozzle nonmetal material section sleeving the central air nozzle metal section; the pulverized coal nozzle is provided with a pulverized coal nozzle metal section connected with the pulverized coal pipeline and a pulverized coal nozzle nonmetal material section inserted into the pulverized coal nozzle metal section. A covering wall temperature attenuation region at the front end of the nozzle is made of a ceramic material resisting high temperature wear; a nozzle connecting section uses a conventional metal material; a high-order wall temperature fault is formed on the connected surface of two materials, so that burning loss of the metal nozzle is avoided, the operation of a shutdown burner at low cooling air volume is realized, oxygen consumption in the burner region is reduced and the control over nitric oxide is more favorable. The low air cooling volume burner is an efficient and environment-friendly reliable burner and is particularly suitable for high volatile bituminous coal.

Description

technical field [0001] The invention relates to the technical field of boiler pulverized coal combustion, in particular to a low cooling air volume burner using composite material nozzles. Background technique [0002] For wall-type flush-fired pulverized coal boilers that burn bituminous coal, the air staged combustion method is usually used to control NOx emissions, that is, the lower oxygen content in the burner area is used to control the generation of NOx, and the burner is placed at a certain height above the burner area. The air vent forms a NOx reduction area. [0003] During the actual operation, the wall temperature of the burner nozzle is monitored. Under the condition of normal operation of each equipment, the wall temperature of the burner in operation is far below the range due to the medium cooling, and the nozzle of the burner out of operation exposed to the furnace flame, each The nozzle wall temperature is at a relatively high level, especially when the up...

AI Technical Summary

Problems solved by technology

In short, under the same cooling conditions, the larger the nozzle area exposed to the radiation of the furnace flame, the higher the wall temperature of the nozzle, and after the nozzles are covered with each other relative to the furnace flame, the wall temperature attenuation is obvious. Primary wind, so the nozzle cooling effect on the inner and outer sides of the primary wind is the worst

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