Characteristics of Pore Structure in Filtering Layer of High Strength Reaction Bonded Silicon Carbide Hot Gas Filter for IGCC

The high strength reaction bonded SiC(RBSC) hot gas filter was newly developed for IGCC. The RBSC hot gas filter was consisting of RBSC porous support and clay bonded SiC filtering layer which were separately fabricated. The clay bonded SiC filtering layer on RBSC support was fabricated by spray coating process and subsequently sintering process using SiC powder and feldspar powder. In this study, the pore structure including porosity and pore size of clay bonded SiC filtering layer was controlled by changing amounts of feldspar. With increasing the amounts of feldspar in filtering layer, the porosity and pore sizes in the filtering layer was decreased. The maximum porosity and average pore size of clay bonded SiC filtering layer fabricated in this study were 41% and 8 μm, respectively. The pore structure of filtering layer of hot gas filter for IGCC was optimized by controlling amounts of feldspar.