The gas from combustion or gasification of fossil fuel contains flyash and other particulate. The flyash is separated from the gas in a plurality of standleg moving granular-bed filter modules. Each module includes a dipleg through which the bed media flows into the standleg. The bed media forms a first...http://www.google.com.au/patents/US5653181?utm_source=gb-gplus-sharePatent US5653181 - Separation of particulate from flue gas of fossil fuel combustion and gasification
