Patent ID: 6474250
Filing Date: 2002-11-05
Classification: F23D

Abstract:
A nozzle assembly for use in a pulverized coal burner of the type wherein the nozzle assembly discharges into a surrounding stream of axially flowing air, the nozzle assembly comprising:an elongated tubular nozzle body having a central longitudinal axis and axially spaced inlet and outlet ends; a coal/air supply introducing a flowing mass of pulverized coal and primary air into said inlet end of said nozzle body for axial flow through said nozzle body to said outlet end; a venturi in said nozzle body between said inlet and outlet ends for concentrating the flow of pulverized coal and primary air at the center of said nozzle tube and creating a fuel rich central region, said venturi including an upstream converging wall section and a restricted venturi throat; a spreader in said nozzle body between said venturi throat and said outlet end, said spreader including a plurality of swirl vanes inclined relative to said axis for imparting a swirling motion to the flow of pulverized coal and primary air; a flow stabilizer mounted at said outlet end of said nozzle body; said stabilizer including a first portion extending radially outward from said nozzle body into the surrounding air stream for deflecting the air stream away from said axis; and said stabilizer including a second portion extending radially inward from the nozzle body into the swirling flow of pulverized coal and primary air said outlet end of said nozzle body comprising a circular edge, said stabilizer comprising a ring mounted at said circular edge, said ring comprising a plurality of discrete ring segments connected to said nozzle body; and a plurality of lugs attached to the inner surface of said nozzle body adjacent said circular edge, said ring segments being fastened to said lugs.