Abstract A modification of apparatus for separating fine particles from a gaseous fluid to provide means for classifying the fine particles is presented. The apparatus for separating particles from fluid is related to that disclosed and claimed in U.S. Pat. No. 3,199,268, granted Aug. 10, 1965 to Karl-Heinz Oehlrich et al. This prior invention involves a primary flow of particles entrained in a fluid medium generally axially of a cylindrical processing chamber from an inlet duct near one end to an outlet duct at the other end. A solid ground closes a portion of the chamber near the inlet duct save for an annular open space next to the wall of the chamber. A secondary circulatory flow is imparted to the fluid medium above the solid ground which causes the solid particles to be separated from the medium and to fall through the annular space into a collecting hopper. The modification of this invention does away with the collecting hopper and uses the bottom end wall of the processing chamber as a solid ground, and the inlet duct is extended above the bottom end wall to form a collecting chamber for the solid particles separated from the fluid medium in the processing chamber. A discharge duct for these solid particles leads tangentially out of the collecting chamber.
In apparatus for collecting finely divided solid sticky particles entrained in a hot gaseous medium, comprising an elongated processing chamber having rotationally symmetrical side walls and having an axially positioned inlet duct near one end wall for the introduction of finely divided solid sticky particles entrained in a gaseous medium and said chamber having an outlet duct near its other end, said two ducts being coaxial and defining together a primary flow axis, said inlet duct including a generally cylindrical coaxial wall extending inwardly of said chamber to a zone at a predetermined distance from said one end wall, stationary vanes at the discharge end of said inlet duct inclined upwardly and outwardly all in the same direction and causing said primary flow, agitating means for imparting to the primary flow of the medium in said chamber a circulatory secondary flow causing said solid particles to move through said chamber toward said inlet end adjacent said side walls, said one end wall forming a solid ground at an intermediate portion of the length of said inlet duct and extending radially outwardly therefrom to said side walls, the walls of said chamber up to said zone and including said one end wall providing a collection chamber for said solid particles between said one end wall and said zone of predetermined extent, the arrangement of said stationary means and said agitating means being such as to form in said processing chamber a vortex sink near said solid ground and a vortex source remote from said inlet duct toward said outlet duct, and a discharge duct for solid particles collected in said collection chamber, said discharge duct leading tangentially away from the peripheral edge of said collection chamber in the same direction as said circulating secondary flow caused by said agitating means, and low pressure gaseous jet means in said collection chamber positioned tangentially at the peripheral edge of said collection chamber and directed toward said discharge duct and keeping said finely divided sticky particles continuously moving while aiding the movement of said solid particleS toward said discharge duct.
Claim 2
Dependent Claim
346 words
In apparatus for collecting finely divided solid sticky particles entrained in a hot gaseous medium, comprising an elongated processing chamber having rotationally symmetrical side walls and having an axially positioned inlet duct near one end wall for the introduction of finely divided solid sticky particles entrained in a gaseous medium and said chamber having an outlet duct near its other end, said two ducts being coaxial and defining together a primary flow axis, said inlet duct including a generally cylindrical coaxial wall extending inwardly of said chamber to a zone at a predetermined distance from said one end wall, stationary vanes at the discharge end of said inlet duct inclined upwardly and outwardly all in the same direction and causing said primary flow, agitating means for imparting to the primary flow of the medium in said chamber a circulatory secondary flow causing said solid particles to move through said chamber toward said inlet end adjacent said side walls, said one end wall forming a solid ground at an intermediate portion of the length of said inlet duct and extending radially outwardly therefrom to said side walls, the walls of said chamber up to said zone and including said one end wall providing a collection chamber for said solid particles between said one end wall and said zone of predetermined extent, the arrangement of said stationary means and said agitating means being such as to form in said processing chamber a vortex sink near said solid ground and a vortex source remote from said inlet duct toward said outlet duct, and a discharge duct for solid particles collected in said collection chamber, said discharge duct leading tangentially away from the peripheral edge of said collection chamber in the same direction as said circulating secondary flow caused by said agitating means, and low pressure gaseous jet means in said collection chamber positioned tangentially at the peripheral edge of said collection chamber and directed toward said discharge duct and keeping said finely divided sticky particles continuously moving while aiding the movement of said solid particleS toward said discharge duct.