Flue gas recirculation nozzle device for preventing boiler water cooling wall from slagging and abrasion

Abstract

The invention discloses a flue gas recirculation nozzle device for preventing a boiler water cooling wall from slagging and abrasion. The flue gas recirculation nozzle device comprises a flue pipe, a flue gas outlet end of the flue pipe penetrates through a boiler wall and extends into a boiler, a flue gas pipe flaring is arranged at the flue gas outlet end of the flue pipe, and a cap is arranged at the flue gas pipe flaring. The flue gas recirculation nozzle device further comprises a first boiler wall baffle, a second boiler wall baffle and an adjustable screw rod, the outer end of the adjustable screw rod is a threaded end and is in threaded connection with a threaded hole in an adjusting support, and the adjusting support is fixed to the flue pipe. The defects that the boiler water cooling wall is prone to slagging and abrasion are overcome, the design of a pipe opening of the flue pipe is improved, flue gas is well jetted in the circumferential diffusion direction, and the flue gas diffusion area is increased; through the improvement of the cap, the flue gas is changed into circumferential injection, and meanwhile, the flue gas can be better attached to the water cooling wall through the design of the small radian of an internally-buckled turned edge, so that the protection effect of a curtain wall is better; the distance between the cap and the flue gas pipe flaring can be adjusted; and inhibition of slagging and abrasion of the water cooling wall is facilitated.

Description

technical field [0001] The invention belongs to the field of coal-fired boiler devices, in particular to a flue gas recirculation nozzle device for preventing slagging and abrasion of boiler water walls, and is suitable for coal-fired boilers. Background technique [0002] During the combustion process of coal-fired boilers, due to the incomplete combustion of fuel and the low melting point of ash, slagging and wear on the water-cooled wall in the furnace are very common. The traditional flue gas recirculation device extracts a part of the low-temperature flue gas directly before the boiler air preheater and mixes it with the air supply before sending it into the furnace to reduce the combustion temperature and oxygen concentration, thereby reducing the emission concentration of nitrogen oxides. [0003] However, the traditional recirculation of flue gas cannot solve the problems of slagging of the water wall in the high temperature zone of the boiler furnace and the erosion...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional recirculation of flue gas cannot solve the problem of slagging of the water wall in the high temperature zone of the boiler furnace and the erosion and wear of the water wall in the furnace

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