Method for improved gas-solids separation
First Claim
1. Method for removing particulate solids from a gas stream which comprises:
- (a) passing a first input gas stream containing first particulate solids of varying sizes into a cylindrical separation chamber having a vertical cylindrical sidewall, having an inlet upper end and an outlet lower end, and having a vertical cylindrical perforated hollow rotor axially mounted within said cylindrical sidewall to thereby define a cylindrical annular space between said rotor and said sidewall;
(b) rotating said rotor at high rotational velocity;
(c) circulating first input gas around the rotor and in said annular space at high orbital velocity sufficient to cause larger size first particulate solids to be spun outwardly by centrifugal force toward the cylindrical sidewall;
(d) passing circulating first input gas containing smaller size first particulate solids inwardly toward said rotor in ever decreasing circular orbits under conditions sufficient to cause at least a portion of said smaller size first particulate solids to collide with each other to form agglomerated larger size first particulate solids and wherein at least a portion of said smaller size first particulate solids impinges upon the surface of said rotor and said impinged first particulate solids agglomerate at said surface;
(e) passing said agglomerated particulate solids outwardly by centrifugal force toward the cylindrical sidewall;
(f) passing a circulating first input gas having substantial freedom from particulate solids through a plurality of perforations in the surface of said rotor and into a hollow space within said rotor;
(g) passing at least a portion of accumulating larger size first particulate solids and at least a portion of accumulating agglomerated first particulate solids downwardly in said annular space and downwardly along the inner surface of said sidewall to the outlet lower end of said separation chamber by means of gravitational force;
(h) withdrawing accumulating larger size first particulate solids and accumulating agglomerated first particulate solids and accumulating agglomerated first particulate solids from the outlet lower end of said separation chamber as a recovered particulate solids product; and
(i) withdrawing a gas stream having substantial freedom from particulate solids from the hollow within said rotor and from the separation chamber as a clean gas product.
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Accused Products
Abstract
Methods are disclosed for the removal of particulate solids from a gas stream at high separation efficiency, including the removal of submicron size particles. The apparatus includes a cyclone separator type of device which contains an axially mounted perforated cylindrical hollow rotor. The rotor is rotated at high velocity in the same direction as the flow of an input particle-laden gas stream to thereby cause enhanced separation of particulate matter from the gas stream in the cylindrical annular space between the rotor and the sidewall of the cyclone vessel. Substantially particle-free gas passes through the perforated surface of the spinning rotor and into the hollow rotor, from when it is discharged out of the top of the apparatus. Separated particulates are removed from the bottom of the vessel.
49 Citations
13 Claims
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1. Method for removing particulate solids from a gas stream which comprises:
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(a) passing a first input gas stream containing first particulate solids of varying sizes into a cylindrical separation chamber having a vertical cylindrical sidewall, having an inlet upper end and an outlet lower end, and having a vertical cylindrical perforated hollow rotor axially mounted within said cylindrical sidewall to thereby define a cylindrical annular space between said rotor and said sidewall; (b) rotating said rotor at high rotational velocity; (c) circulating first input gas around the rotor and in said annular space at high orbital velocity sufficient to cause larger size first particulate solids to be spun outwardly by centrifugal force toward the cylindrical sidewall; (d) passing circulating first input gas containing smaller size first particulate solids inwardly toward said rotor in ever decreasing circular orbits under conditions sufficient to cause at least a portion of said smaller size first particulate solids to collide with each other to form agglomerated larger size first particulate solids and wherein at least a portion of said smaller size first particulate solids impinges upon the surface of said rotor and said impinged first particulate solids agglomerate at said surface; (e) passing said agglomerated particulate solids outwardly by centrifugal force toward the cylindrical sidewall; (f) passing a circulating first input gas having substantial freedom from particulate solids through a plurality of perforations in the surface of said rotor and into a hollow space within said rotor; (g) passing at least a portion of accumulating larger size first particulate solids and at least a portion of accumulating agglomerated first particulate solids downwardly in said annular space and downwardly along the inner surface of said sidewall to the outlet lower end of said separation chamber by means of gravitational force; (h) withdrawing accumulating larger size first particulate solids and accumulating agglomerated first particulate solids and accumulating agglomerated first particulate solids from the outlet lower end of said separation chamber as a recovered particulate solids product; and (i) withdrawing a gas stream having substantial freedom from particulate solids from the hollow within said rotor and from the separation chamber as a clean gas product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Method for removing particulate solids from a gas stream which comprises:
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(a) passing a first input gas stream containing first particulate solids of varying sizes into a cylindrical separation chamber having a vertical cylindrical sidewall, having an inlet upper end, and having an outlet lower end; (b) circulating first input gas around the vertical central axis of said separation chamber at high orbital velocity sufficient to cause larger size first particulate solids to be spun outwardly by centrifugal force toward the cylindrical sidewall; (c) passing circulating first input gas containing smaller size first particulate solids inwardly toward said axis in ever decreasing circular orbits under conditions sufficient to cause at least a portion of said smaller size first particulate solids to collide with each other to form agglomerated larger size first particulate solids; (d) passing said agglomerated first particulate solids outwardly by centrifugal force toward the cylindrical sidewall; (e) passing a second input gas stream containing greater size second particulate solids into said separation chamber at an entry orbit located inside of the entry orbit of said first input gas stream; (f) spinning said greater size second particulate solids outwardly toward the cylindrical sidewall by centrifugal force to cause at least a portion of said greater size second particulate solids to collide with at least a portion of the first particulate solids of said first input gas stream to thereby form agglomerated greater size second particulate solids which continue to spin outwardly toward the sidewall; (g) passing circulating first gas having substantial freedom from first and second particulate solids, and circulating second gas having substantial freedom from first and second particulate solids, axially upward along an axial center portion of said separation chamber and into said inlet upper end of said chamber; (h) passing first particulate solids, agglomerated first particulate solids, second particulate solids, and agglomerated second particulate solids downwardly in an outer portion of said separation chamber and downwardly along the inner surface of said sidewall to the outlet lower end of said separation chamber by means of gravitational force; (i) withdrawing first particulate solids, agglomerated first particulate solids, second particulate solids, and agglomerated second particulate solids from the outlet lower end of said separation chamber as a recovered particulate solids product; and
,(j) withdrawing first gas having substantial freedom from first and second particulate solids, and second gas having substantial freedom from first and second particulate solids, from said inlet upper end of said chamber as a clean gas product mixture. - View Dependent Claims (10, 11, 12, 13)
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Specification