| Permeation Behavior of Oxide Bonded SiC Ceramics at
High Temperature and Prediction of Pressure Drop in
Candle Filters |
Atanu Dey,1 Nijhuma Kayal,1, * Omprakash Chakrabarti1 and Murilo D. M. Innocentini2
Pages : 59-67
DOI : 10.1080/0371750X.2022.2064918
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| Abstract |
| Oxide-bonded silicon carbide supports of porosity ranging from 33% to 47% were
prepared by heating powder compacts (SiC, clay and alumina) at 1400oC in air with
graphite acting as a pore former. The supports were spray-coated with an aqueous
slurry of fine SiC powder (d50=15 m), then sintered to produce a filtering layer with
thickness ranging from 116 to 200 m and average pore size ranging from 5 to 20 m.
Airflow tests were performed on both supports and coated filters at temperatures ranging
from 25o to 700oC and superficial velocities ranging from 0.02 to 0.9 m.s–1. Experimental
permeability coefficients were used to simulate the pressure drop behavior of hypothetical
candle filters for industrial combustion/gasification processes (biomass combustion
in water-tube steam boilers (BCSB), pressurized fluidized-bed combustion (PFBC) and
integrated gasification combined cycle (IGCC)). The simulated permeation properties
of the hypothetical candles were compared to those of commercial hot gas filters.
[Keywords: Porous ceramics, Silicon carbide, Permeability, Granular filter] |
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