High-Temperature Particulate Removal by Moving Bed Granular Filtration

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Abstract
A major problem in use of low-grade fuels for direct firing of gas turbines is particulate removal at high temperatures. Combustion Power Company has, in a multi-phase program sponsored by the United States Department of Energy, developed a continuous moving bed granular filter which has successfully operated at inlet loadings as high as 3.5 grains/ft3 (7 × 10−4 kg/m3) and temperatures above 1600 F (870 C) representative of the tertiary cleaning step in a coal-fired pressurized fluid bed gas turbine power generation system. Collection performance tests of a 2000 ft3/min (1 m3/s) pilot filter resulted in repeatable collection efficiencies as high as 99.7 percent with submicron collection above 90 percent. Design features which successfully eliminated ash pluggage are discussed.

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