Methods and apparatus for heating particulate material
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United States of America Patent
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-
Dec 2, 1980
Grant Date -
N/A
app pub date -
Mar 13, 1979
filing date -
Mar 13, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are provided for heating and/or drying particulate materials such as coal wherein the particulates are fed into a fluidizing chamber, carried in a stream of heated oxygen-free gas at a temperature sufficiently high to heat the particles to a preselected temperature. The particles are then removed from the gas stream at the preselected temperature and then the gas is reheated in a heat exchanger and recycled. Where the particulate material to be dried yields a vapor, such as steam, the vapor is used as the transport or fluidizing gas. Means are provided for removing and/or condensing such vapor beyond the amount needed for fluidization.
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