MULTIPLE INTEGRATED-LAYER CERAMIC FIBER FILTER PAPER AND METHOD

摘要

A composition of a multiple-layered ceramic fiber filter paper and method for manufacturing for use in a filter apparatus removes particulate from high temperature gas streams. In this application, ceramic fibers of varying diameters and lengths are combined in such a manner to yield different specific average pore sizes in segregated locations in the filter paper. The fiber combinations are formed into a paper sheet using a method that produces two or three porosity zones with different average pore sizes in each layer or porosity zone. The porosity gradient from large at gas stream entry to fine at gas stream exit increases particle-holding capacity while reducing the filtered gas backpressure experienced in single sized porosity layer media.