A W-type flame decoupling combustion furnace and decoupling combustion method

Abstract

The invention relates to a W-type flame decoupling combustion furnace and a decoupling combustion method. A hearth of the decoupling combustion furnace is enclosed by a front and a back side walls, an upper hearth side wall (12), a lower hearth arch (13), a lower hearth side wall (14), and a lower hearth cold ash hopper wall (15); the lower hearth arch (13) is provided with several groups of symmetric super-dense primary air nozzle (8), dense primary air nozzle (7) and light primary air nozzle (6) which are orderly arranged from the hearth center to the outside; the several groups of primary air nozzles (8, 7, 6) are uniformly arranged between the front and the back walls on the lower hearth arch (13) with a downward nozzle direction; several above-side wall secondary air nozzles (4) are symmetrically arranged on the lower hearth side wall (14); the above-side wall secondary air nozzles (4) and the primary air nozzles (8, 7, 6) are staggeredly arranged along the anterior / posterior direction; several below-side wall secondary air nozzles (3) are arranged between the front and the back walls on the lower hearth side wall (14). The device of the invention reduces the generation of NOx and fly ash combustible matter.

Description

technical field [0001] The invention relates to the field of pulverized coal combustion equipment, in particular, the invention relates to a W-shaped flame decoupling combustion furnace and a decoupling combustion method. Background technique [0002] In the practical application of pulverized coal combustion, with the increase of the combustion temperature and oxygen concentration of the pulverized coal-air mixture in the combustion stage, the pulverized coal is more likely to be burned quickly and fully, and the fly ash combustibles (unburned carbon and CO ) content is reduced; at the same time, high temperature oxygen enrichment will make the NO produced in the combustion process x On the other hand, the lower the combustion temperature and oxygen concentration of the pulverized coal-air mixture in the combustion stage, the better the suppression of nitrogen oxides NO x Generated, but coal dust is less likely to burn out. Therefore, the removal of fly ash combustibles a...

AI Technical Summary

Problems solved by technology

[0008] If simply intensified combustion, simple air graded supply and lower furnace temperature, although to a certain extent can make NO x Emissions are reduced, but the carbon content of fly ash is significantly increased, and boiler efficiency and safety are drastically reduced

Images