Pollution control apparatus and method
OwnerLadislav J. Pirconinventor
Life of this patent
Estimating the term…
Abstract
Apparatus and method operating at relatively low pressure drop and low initial velocity for removing pollutants down to sub-micron sizes from gas streams comprising a nozzle means accelerating the gas flow and impinging the pollutants upon a plate for removal of a major portion of pollutants and then passing the gas stream through fabric filters for removal of substantially all of the remaining particulate pollutants.
Claims22
A process for removing particulate matter from gas streams by combination of impingement and filtration comprising:
- passing said gas stream having particulate matter therein through the entry of a nozzle;
- accelerating the gas stream through a converging portion of said nozzle having a mean angle of convergence of about 4 to 8 degrees providing outlet velocities of about 2 to 12 times the entrance velocity;
- passing said particulate-containing gas stream from the nozzle outlet through an expansion zone decelerating the gas, said acceleration and deceleration of the gas stream causing particulates to agglomerate;
- impinging said agglomerates and particulates upon a fixed impingement surface of substantially imperforate material thereby separating said particulates and agglomerates from said gas stream;
- removing said particulates and agglomerates from the expansion zone;
- separately removing gas having a major portion of original particulate matter removed therefrom from the expansion zone and passing it through fabrice filter means removing a substantial amount of the remaining particulates forming clarified gas;
- and removing the clarified gas from said fabric filter means;
- said acceleration, deceleration and impinging removing in excess of about 70 weight percent of said particulate matter in said gas stream.
An apparatus for removing particulate matter from gas streams by combination of impingement and filtration comprising:
- a chamber defining a gas expansion zone;
- nozzle means having an entry at one end and an outlet at the other end, said entry being in communication with a gas stream having undesired particulate matter entrained therein and said outlet being in communication with said gas expansion zone, said entry having an effective cross-sectional area of about 2 to 12 times the effective cross-sectional area of said outlet and the mean angle of convergence of said nozzle being in the range of about 4 to 8 degrees;
- impingement means comprising a fixed impingement imperforate surface in said expansion zone opposite said nozzle outlet at a distance from said outlet to insure impingement thereon of substantially all particulate matter entrained in the gas stream passing from said nozzle outlet after expansion of the gas stream in said chamber reducing the gas velocity;
- means for removing particulate matter from the expansion zone;
- means for passing the gas having a major portion of original particulate matter removed therefrom from the upper portion of the expansion zone to a fabric filter means;
- means for passing said gas having a major portion of original particulate matter removed therefrom through said fabric filter means removing a substantial amount of the remaining particulates;
- means for removing particulates from said fabric filter means;
- and
- means for separately removing the clarified gas from said fabric filter means.
Dependencies are inferred from the claim text.