Nozzle tip for pulverized coal burner

A nozzle tip for a burner on a pulverized fuel-fired furnace for receiving a stream of pulverized fuel and air discharging from the burner and directing said pulverized fuel and air stream into the furnace, comprising:

• a. a hollow, open-ended base body adapted to be pivotally mounted to the discharge end of the burner having an outer shell and an inner shell disposed substantially coaxially in spaced relationship within the outer shell so as to define a first flow passage through the interior of the inner shell and a second flow passage through the annular space between the inner and outer shells;
• b. a replaceable, hollow, open-ended end cap having an outer shell and an inner shell disposed substantially coaxially in spaced relationship within the outer shell so as to define a first flow passage through the interior of the inner shell and a second flow passage through the annular space between the inner and outer shells;
• c. a replaceable, hollow, open-ended, weld-free insert cast of a highly abrasion resistant material having an inlet end and an outlet end, said cast insert disposed intermediate of said base body and said end cap with its inlet end mating with and abutting against the discharge end of the inner shell of said base body and its outlet end mating with and abutting against the receiving end of the inner shell of said end cap thereby defining a first flow conduit formed of the first flow passage of said base body, the interior of said cast insert and the first flow passage of said end cap through which the pulverized fuel and air stream passes from the burner into the furnace;
• and
• d. means for removably attaching said end cap to said base body with said cast insert secured therebetween so as to mate the outer shell of said end cap with the outer shell of said base body thereby defining a second flow conduit formed of the second flow passage of said base body and the second flow passage of said end cap through which additional air passes into the furnace.

A replaceable end cap for mounting to a coal nozzle tip comprising:

• a. a hollow, open-ended outer shell;
• b. a hollow, open-ended inner shell disposed substantially coaxially in spaced relationship within the outer shell so as to define a first flow passage through the inner shell and a second flow passage through the annular space between the inner and outer shells;
• c. at least one splitter plate disposed within the inner shell so as to subdivide the first flow passage therethrough into multiple passages;
• and
• d. a plurality of plate-like members disposed transversely between the inner and outer shells and extending therefrom for engaging and mounting to said coal nozzle tip.