Separation of particulate from flue gas of fossil fuel combustion and gasification

Patent · Tue Aug 05 04:00:00 EDT 1997

OSTI ID:516916

Yang, W C; Newby, R A; Lippert, T E

The gas from combustion or gasification of fossil fuel contains fly ash and other particulates. The fly ash 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 filter bed having an upper mass having a first frusto-conical surface in a frusto-conical member at the entrance to the standleg and a lower mass having a second frusto-conical surface of substantially greater area than the first surface after it passes through the standleg. A second filter media bed may be formed above the first filter media bed. The gas is fed tangentially into the module above the first surface. The fly ash is captured on the first frusto-conical surface and within the bed mass. The processed gas flows out through the second frusto-conical surface and then through the second filter bed, if present. The bed media is cleaned of the captured fly ash and recirculated to the moving granular bed filter. Alternatively, the bed media may be composed of the ash from the combustion which is pelletized to form agglomerates. The ash flows through the bed only once; it is not recycled. 11 figs.

• Research Organization: Westinghouse Electric Corporation
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-91MC27259
• Assignee: Westinghouse Electric Corp., Pittsburgh, PA (United States)
• Patent Number(s): US 5,653,181/A/
• Application Number: PAN: 8-356,982
• OSTI ID: 516916
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
54 ENVIRONMENTAL SCIENCES
COMBUSTORS
DEGASSING
DESIGN
FLUE GAS
FLY ASH
FUEL GAS
GAS GENERATORS
GRANULAR BED FILTERS
HOT GAS CLEANUP
OPERATION