BOILER FURNACE Russian patent published in 1998 - IPC

FIELD: thermal power stations. SUBSTANCE: furnace is divided by center wall 2 into central and peripheral chambers 3 and 4. Center wall 2 is installed between adjacent waterwalls 1 and abuts against them; burners 7 and air nozzles 8 are placed in corners formed in the process. Centers of upper and lower ends 9 and 10 of center walls 2 are tangentially arranged relative to conventional circumferences having different diameters. Circumference abutting against upper ends 9 is smaller in diameter than that abutting against lower ends 10. Center line of burner 7 is directed to center of face of center wall 2 to form obtuse angle along flow path. Bell mouth 16 of nozzle 8 has opening angle of 90 deg. corresponding to port 6 under which it is installed on adjacent faces of external waterwalls 1 therby shutting off open area of port 6 and eliminating carbon loss in riddlings. Carbon loss in fly ash is eliminated due to expanding sectional area of combustion chamber 3 in bottom which cause during separation of larger particles of pulverized fuel on waterwalls 2 falling of these particles to bottom part of furnace thereby eliminating its to convective flue. Coke particles strike wear plate 15 installed along center line of burner 7 in center of center wall 2 to ensure thermal pulverization of fuel dispensing with separators in fuel pulverizing system. EFFECT: reduced slagging simplified design, reduced emission of nitrogen oxides, which makes it possible to turn ballasted. 3 dwg