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US 5,325,603 AGranted
Solids feed system and method for feeding fluidized beds
AssigneeE. I. Du Pont de Nemours and Company
InventorsDonald H. Eastham, James W. Reeves
Life of this patent
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Abstract
The invention provides an improved method and apparatus for feeding solids to a fluidized bed reactor. A back pressure control valve regulates the pressure drop between the pressure above a solids column in a standpipe and the pressure in the reactor. Solids are fed from the standpipe via a conduit without valve means, the conduit contains a bend of an angle greater than the angle of repose of the solids.
Claims20
A method for continuously feeding particulate solids to a fluidized bed reactor comprising:
- (a) entraining said solids in a flow of inert gas in a line leading to a cyclone wherein gas and solids are separated into an exit gas stream and a gravity stream of solids;
- (b) delivering said gravity stream of solids to an essentially vertical standpipe and delivering said exit gas stream to a vent line;
- (c) providing valve means within said vent line to control the pressure therein thereby controlling the effective hydrostatic head of a solids column in said standpipe;
- (d) fluidizing solids in said standpipe by introducing a flow of inert gas at one or a plurality of locations in said standpipe;
- and
- (e) feeding solids, in a dense phase, from said standpipe directly to a fluidized bed reactor by a feed conduit without valve means, said feed conduit having a bend which is greater than the angle of repose of the particulate solids.
3 more elements
Dependencies are inferred from the claim text.