초록 ▼

A process for thermal treatment of solid particles in a fluidized bed wherein the solid particles by thermal treatment form a lighter weight fraction and a heavier weight fraction, relative to the total contents of the bed. The process is characterized by use of a selective heavier particle discharg

A process for thermal treatment of solid particles in a fluidized bed wherein the solid particles by thermal treatment form a lighter weight fraction and a heavier weight fraction, relative to the total contents of the bed. The process is characterized by use of a selective heavier particle discharge conduit in the sloping bed support and maintenance of a discrete fluid fueled flame in close proximity to and above the opening to the heavier particle discharge conduit. This forms a higher temperature zone in and surrounding the flame, at least about 100°F. higher than the remainder bed temperature. Circulation of solid particles through the flame and its surrounding higher temperature region is promoted both by directing of fluidization gas jets in the fluidized bed support and by the jetting action of the upwardly flowing heavier particle discharge gas.

대표청구항 ▼

In a process for thermal treatment of solid particles in a fluidized bed of the type providing density/size particle classification discharge of heavier weight particles through a necked density/size particle classification heavier particle discharge conduit at the bottom of opposing downwardly slop

In a process for thermal treatment of solid particles in a fluidized bed of the type providing density/size particle classification discharge of heavier weight particles through a necked density/size particle classification heavier particle discharge conduit at the bottom of opposing downwardly sloping bed supports and recirculation of lighter weight particles to said fluidized bed, the improvement comprising: supplying fuel and oxidant through a burner extending upwardly through the central portion of said necked selective heavier particle discharge conduit to maintain a discrete fluid fueled flame in said fluidized bed in the region above an opening of said necked heavier particle discharge conduit forming a higher temperature zone in said fluidized bed in and surrounding said flame, said higher temperature zone at least about 100°F. higher than the remainder bed temperature, and passing solids discharge gas upwardly through an annular necked passage between said burner and said discharge conduit whereby multiple passage of said solids through said higher temperature zone prior to discharge is enhanced.