Methods and apparatus for heating particulate material

Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor

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Details

34 57A, 432 15, 432 58, F26B 308, F26B 1700, F27B 1500

Patent

active

043002919

ABSTRACT:
A method and apparatus are provided for heating and/or drying particulate materials such as coal wherein the particulates are fed into a direct heating 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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patent: 4043049 (1977-08-01), Hedstrom
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patent: 4245395 (1981-01-01), Potter

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