Patent ID: 6361693
Filing Date: 2002-03-26
Classification: B01D

Abstract:
A filter comprising:a casing surrounding a casing interior space with a generally round cross-section having a casing inner diameter and a casing interior cross-sectional area on a cross-sectional plane; and a plurality of filter units arranged in said casing interior space; wherein each respective filter unit of said filter units respectively comprises a porous ceramic medium forming an outer peripheral wall and inner separating walls that respectively bound and separate from each other plural channels that each extend in an extension direction between opposite first and second ends of said respective filter unit; wherein said channels include open channels that penetrate openly entirely through said respective filter unit in said extension direction between said opposite first and second ends, and closed channels that are each closed at said first and second ends; wherein each said respective filter unit has discharge holes that pass through said inner separating walls to communicate adjacent ones of said closed channels with each other and that do not communicate into said open channels, and first and second discharge ports that pass through said outer peripheral wall respectively at opposite sides of said respective filter unit to communicate into respective ones of said closed channels, so as to establish a flow communication path with a respective flow path distance between said first and second discharge ports through respective ones of said closed channels communicated with each other through said discharge holes; wherein each said respective filter unit has a respective filter unit cross-sectional area on said cross-sectional plane, and a total sum of said respective filter unit cross-sectional areas corresponds to at least 35% of said casing interior cross-sectional area; and wherein an average of said respective flow path distances of said flow communication paths of all of said filter units is equal to no more than one half of said casing inner diameter.