Center wall type three-stage air system of opposed swirl combustion boiler

Abstract

The invention discloses a center wall type three-stage air system of an opposed swirl combustion boiler. The center wall type three-stage air system comprises a front wall opposed swirl combustion device and a rear wall opposed swirl combustion device, each combustor of the front wall opposed swirl combustion device and the rear wall opposed swirl combustion device is provided with a primary air powder pipe, inner air swirl blades and outer air swirl blades which form inner secondary air and outer secondary air respectively are arranged on the periphery of each primary air powder pipe, a nozzle group for spraying an air wall is arranged below the central part between the front and rear combustors which are correspondingly arranged on the front wall opposed swirl combustion device and the rear wall opposed swirl combustion device, and the air wall sprayed by the nozzle group forms three-stage air. Primary air high air pressure is converted into kinetic energy through a small amount of air volume, center wall type three-stage air is formed to prevent long and narrow unburned flames from crossing a center line, under-O2 combustion of the tails of long and narrow flames is perfected, and the opposed swirl combustion boiler operates more safely and efficiently with low oxygen content, ultralow NOx content and ultralow CO content.

Description

technical field [0001] The invention relates to an air system of a counter-swirl combustion boiler. Background technique [0002] Atmospheric pollution has attracted more and more attention, but the main means of reducing smog at this stage is still a simple process of reducing one object and one object. For example, the main component of smog is NOx, and the generation of NOx mainly comes from the residual O during coal burning. 2 N with air 2 Synthesis in high temperature environment. In order to control low NOx emissions and meet environmental protection targets, a large amount of liquid ammonia is injected into the tail flue of thermal power station boilers to reduce NOx emissions. If starting from the conditions of NOx generation, reduce the remaining O in the furnace combustion 2 , reduce the smoke temperature in the center of the furnace flame, and strengthen the furnace to lower O 2 Combustion, Enhanced Furnace Low O 2 and O 2 If the distribution is uniform, t...

AI Technical Summary

Problems solved by technology

[0006] Eliminate the method of burning embers above the swirling combustion area, because the pressure of embers is low, it is difficult to cover the center of the furnace when it is arranged on the front and rear walls, and it has no effect on the combustion of the narrow and long flame in the center of the furnace

Facts have also proved this point. After most counter-swirl boilers have been transformed with low-NOx combustion, the addition of ember air has no obvious effect on reducing NOx.

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