METHOD OF THREE-STEP COMBUSTION OF FUEL-AIR MIXTURE IN COAL-FIRED BOILERS Russian patent published in 1999 - IPC

FIELD: heat power engineering; combustion of fuel-air mixture in coal-fired boilers with shaft-mill furnaces. SUBSTANCE: proposed method is based on redistribution of fuel between burning devices and delivery of air required for afterburning of noncompletely combusted fuel products. To provide restoration zone with fuel of high concentration, fuel is taken by special pipe in lower parts of outlet section of shaft in bending area and is delivered into furnace through special splines arranged higher than embrasures. EFFECT: enhanced ecological safety of ambient atmosphere owing to reduction of ejection of nitric oxides. 1 dwg