HEAT-RECOVERY BOILER FURNACE AND SECONDARY-AIR SUPPLY UNIT Russian patent published in 2006 - IPC F23L9/00 F23G7/04 D21C11/12 

FIELD: power engineering.

SUBSTANCE: proposed heat-recovery boiler furnace incorporating secondary-air supply unit feeding air in the form of jets to mentioned furnace has front wall, rear wall, and side walls, black-lye spraying devices mounted on mentioned walls flash with the latter, and plurality of air ducts disposed at several horizontal levels on mentioned walls for feeding air from air supply unit to furnace; mentioned secondary-air supply unit has two horizontal air levels at different heights disposed above lowermost air level or levels and below black lye spraying level or levels; secondary air is supplied from two opposite walls at two mentioned levels; air ducts are disposed at each level so that secondary-air jets are introduced in alternating configuration; air jets of mentioned two air levels are actually disposed one above another in vertical rows, each row being formed by two air jets. Distance V between air levels in vertical direction, as measured from cross axial lines of air ducts to air levels is evaluated using formula V/L ≤ 0.5, where L is distance between two adjacent air ducts at same air level, as measured from longitudinal axial lines of adjacent air ducts.

EFFECT: ability of affording permanent burning air ingress in boiler at all charge levels, improved black lye and air mixing, enhanced environmental friendliness.

24 cl, 3 dwg