FORMATION AND MEASUREMENT OF THE POROSITIES, TENSILE STRENGTHS, AND DEFORMATION COEFFICIENTS OF GASIFICATION FILTER CAKES AT OPERATING TEMPERATURES AND PRESSURES

Various physical properties of filter cakes formed and studied at oper ating temperatures and pressures and under appropriate gas composition s and how rates are important for the development of hot-gas filtratio n for integrated gasification combined cycle (IGGC) use of coal. Elutr iated particles from a gasification pilot plant at the Federal Energy Technology Center of the U.S. DOE were used in a laboratory-scale appa ratus to prepare filter cakes at various gas-flow velocities and over a range of temperatures (25-515 degrees C) and pressures (100-300 kPa) characteristic of the pilot plant. This laboratory apparatus also was used to measure the porosities, tensile strengths, and deformation co efficients of the cakes at these same temperatures and pressures. Vari ous properties of the filter cakes have been correlated. It is believe d that the novel experimental methods and interpretational model emplo yed allow accurate laboratory measurement of these filter-cake propert ies for the operating conditions of large-scale plants, for use in eng ineering models of operating data and in theoretical models of filter- cakes and filter-cleaning, AEROSOL SCIENCE AND TECHNOLOGY 29:236-245 ( 1998) (C) 1998 American Association for Aerosol Research.