초록

Disclosed is a method and apparatus for calcining or heat treating finely divided solids to effect a change in physical and/or chemical properties and, in so doing and prior to exhaust, filtering out particles entrained in the exhaust.

대표청구항 ▼

Filter apparatus for filtering the off-gas from the bed of a fluidized bed calcining system for heating granular solids comprising at least one fluidized bed reactor to receive a charge of solids, means to heat the solids, and means to force a gas through the solids, said filter apparatus comprising

Filter apparatus for filtering the off-gas from the bed of a fluidized bed calcining system for heating granular solids comprising at least one fluidized bed reactor to receive a charge of solids, means to heat the solids, and means to force a gas through the solids, said filter apparatus comprising a plurality of gas-permeable filter elements interposed in the path of the stream of off-gas so arranged that some of the elements are in filtering phase while other elements are in blow-back phase for cleaning the elements, a station including means to blow back the filter elements, and means to intermittently skip the filter elements past the blow-back station to alternate the filter elements between filtration and blow back phase according to a predetermined cycle to maintain continuous filtering performance.