Patent ID: 6361701
Filing Date: 2002-03-26
Classification: B01D

Abstract:
Method for continuous filtration of fluids laden with solids, by means of a filter bed consisting of granular filter media, which is moved continuously through a vertically oriented cylindrical annular space (2), continuously flowed through by the fluid to be filtered in a radial direction,whereby the granular filter media, laden with the filtered solids, is withdrawn continuously near the lower end of the annular space (2) and, freed of the filtered solids, returned to the annular space at its upper end, whereby a granular media, consisting of two or several grain size distributions from coarse to fine, is used as filter media, this granular media being classified and distributed before and during its addition to the annular space (2) in such a way, that the grain sizes in the fill of the filter bed decrease in the flow direction of the fluid to be filtered, further characterized through the grain sizes decreasing in the fill of the filter bed in a radial direction from the inside to the outside, and the fluid to be filtered flowing through the filter bed in a radial direction from the inside to the outside with decreasing velocities; further characterized in that the annular space (2) is vertically oriented and cylindrical and surrounded by an outer wall (4) an d limited by an inner wall (3) both inner and outer wall being permeable to liquid.