Furnaces – Utilizing powdered fuel – Having rotary flow means
Patent
1992-07-06
1994-11-22
Favors, Edward G.
Furnaces
Utilizing powdered fuel
Having rotary flow means
110347, 431183, 239405, F23D 102
Patent
active
053658655
ABSTRACT:
A flame stabilizer for a burner of solid fuel, such as pulverized coal or sander wood dust, is described whereby the swirl number is varied radially to enhance swirl inducement towards the periphery of the flame stabilizer while more axial flow occurs near the central conduit through which fuel is supplied. The amount of swirl and the amount of combustion air being selected so as to provide an integrated swirl number for the flame stabilizer in the range from about 0.6 to about 2.0. A pressure control ring is described with which the static pressure in the windbox is increased to a level where flame pulsations attributable to low static pressure in the windbox are reduced while the vortex is maintained. An enhanced axial combustion air flow around the discharge end of the fuel supply conduit is described to modify the position of the adverse pressure gradient boundary in a downstream direction. In one embodiment, the flame stabilizer employs vanes with such orientation and shape as to deswirl an excessively high swirling air flow.
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