초록 ▼

A fluidized bed combustor is provided with a multistage arrangement of vortex generators in the freeboard area. The vortex generators are provided by nozzle means which extend into the interior of the freeboard for forming vortices within the freeboard area to enhance the combustion of particulate m

A fluidized bed combustor is provided with a multistage arrangement of vortex generators in the freeboard area. The vortex generators are provided by nozzle means which extend into the interior of the freeboard for forming vortices within the freeboard area to enhance the combustion of particulate material entrained in product gases ascending into the freeboard from the fluidized bed. Each of the nozzles are radially inwardly spaced from the combustor walls defining the freeboard to provide for the formation of an essentially vortex-free, vertically extending annulus about the vortices whereby the particulate material centrifuged from the vortices against the inner walls of the combustor is returned through the annulus to the fluidized bed. By adjusting the vortex pattern within the freeboard, a significant portion of the full cross-sectional area of the freeboard except for the peripheral annulus can be contacted with the turbulent vortical flow for removing the particulate material from the gaseous products and also for enhancing the combustion thereof within the freeboard.

대표청구항 ▼

A combustor comprising a vertically oriented housing having walls defining lower and upper regions, a combustion zone in the lower region of the housing, means for introducing particulate fuel into the combustion zone, means for introducing a primary stream of gaseous combustion-supporting medium in

A combustor comprising a vertically oriented housing having walls defining lower and upper regions, a combustion zone in the lower region of the housing, means for introducing particulate fuel into the combustion zone, means for introducing a primary stream of gaseous combustion-supporting medium into the combustion zone for reacting with the fuel and thereby providing a stream of ascending gaseous combustion products containing entrained solid particulate material, exhaust passageway means extending through the housing at a central location vertically separated from said combustion zone by said upper region for receiving and discharging from said housing gaseous combustion products ascending through said upper region, vortex-generating means comprising a plurality of elongated nozzle means projecting into the upper region of said housing with each of said plurality of nozzle means extending away from the walls of the housing and into said upper region along a plane perpendicular to the walls of said housing and at an angle tangent to the vertical center of the housing, at least two of said plurality of nozzle means being disposed at spaced apart locations in a common cross-sectional plane in said upper region, and means for conveying a secondary stream of combustion-supporting medium through an open end of each of said plurality of nozzle means into said upper region only at a location inwardly spaced from said walls for forming a vortex of the combustion-supporting medium and the gaseous products of combustion including said solid particulate material contacted thereby within the upper region in said cross-sectional plane and with said vortex being spaced from said walls of the housing to define an essentially vortex-free annulus between said walls of the housing and (about) said vortex within said upper region so that the solid particulate matter contacted by said vortex and driven from the vortex towards said walls of the housing enters said annulus and descends from said upper region through said annulus to said combustion zone.