separated overfire air system with a high setting for boilers pulverized coal combustion.

摘要

. Separate overfire air system with high combustion boilers for pulverized coal setting # A furnace (10) comprises a series of lower compartments (18), extending in a vertical arrangement; at least one of the lower compartments (18) has one or more fuel nozzles (20) tangentially introduce the fuel into the combustion chamber, with a displacement relative to a diagonal (DD), It is passing through the corners, opposite each other, of the combustion chamber. At least one of the lower compartments (18) has one or more air nozzles (22), which introduce air tangentially into the combustion chamber along an offset direction which is offset from the diagonal (DD) and on the same side of the traveling direction of the combustion of the fuel. The air introduced tangentially and the fuel burned so displaced produce turbulence fireball (RB) within the combustion chamber. At least one overfire compartment (24) has at least one air nozzle (40) for injecting air in opposition to the fireball turbulence (RB) and along an opposite direction of travel, which it is offset from the other side of the diagonal (DD), and this so that the injected air can promote the development of turbulence fireball (RB) in an upward flow.