F - Mech Eng,Light,Heat,Weapons – 23 – D
Patent
F - Mech Eng,Light,Heat,Weapons
23
D
110/20
F23D 1/00 (2006.01)
Patent
CA 1186951
-1- VENTURI BURNER NOZZLE FOR PULVERIZED COAL Abstract of the Disclosure A new and improved nozzle for pulverized coal comprises a tubular nozzle having an inlet for receiving a primary, flowing stream of coal/air mix- ture and an outlet for discharging the stream into a furnace. A venturi-like, flow constrictor is coaxially disposed in the nozzle adjacent the outlet end with a divergent flow section terminating at a maximum diameter adjacent the outlet end of the nozzle in the furnace. A convergent venturi section is mounted upstream for concentrating the pulverized coal toward the central portion of the flowing stream and a flow spreader is mounted in coaxial alignment in the diver- gent flow section of the venturi and includes a maximum diameter, open end adjacent the outlet end of the nozzle . Wall surf aces of the spreader cooperate with those of the divergent flow section to form an annular pattern of discharge from the outlet end of the nozzle. A stream of secondary air is introduced to flow in a rapidly swirling annular pattern around the discharge from the nozzle, and by properly matching the secondary air velocity to that of the primary air/coal discharge velocity, the flame is increased in length and an outer, torroidal recirculation zone is formed around the outside of the coal/air discharge pattern. An inner, recirculation zone is created adjacent the large open end of the flow spreader inside the primary air/coal discharge pattern. A plurality of swirl vanes are provided between the outer surface of the spreader and the adjacent facing surface of the diver- gent flow section for imparting a swirling action for stabilizing the annular discharge pattern of the pri- mary coal/air stream from the conduit into the furnace. This stabilized discharge pattern forms a wall or -2- shield from the secondary air to provide a high tem- perature, reducing stagnant area adjacent the open end of the flow spreader. The inner and outer recir- culation zones draw a portion of the hot combustion products back toward the open end of the flow spreader and volatiles in the coal are driven off rapidly in this high temperature, reducing atmosphere, minimizing the formation of NOX.
415934
Itse Daniel C.
Penterson Craig A.
Riley Stoker Corporation
Smart & Biggar
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