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US 4,062,760 AGranted
Dry fines recycle in a coking process
AssigneeExxon Research & Engineering Co.
InventorDon E. Blaser
Life of this patent
Estimating the term…
Abstract
In a coking process wherein a stream of fluidized solids is passed from a fluidized bed coking zone to a second fluidized bed, entrained coke fines recovered from the gaseous effluent of the second fluidized bed zone are recycled as dry fines to the coking zone.
Claims16
In a coking process comprising the steps of:
- a. contacting a carbonaceous material under fluid coking conditions in a coking zone containing a first bed of fluidized solids to form coke, said coke depositing on said fluidized solids;
- b. introducing a portion of said solids with a coke deposition thereon to a second zone containing a second bed of fluidized solids;
- c. recovering from said second zone a gaseous stream containing entrained solid fines;
- and
- d. separating at least a portion of said fines from said gaseous stream as dry fines having a particle size ranging up to about 74 microns, the improvement which comprises:
- e. mixing said portion of said separated dry fines with a gas, said portion of said separated dry fines consisting entirely of particles not greater than 74 microns, and
- f. introducing the resulting mixture of dry fines and gas into said coking zone at a velocity of at least 25 feet per second, said dry fines in said mixture consisting entirely or particles not greater than 74 microns.
4 more elements
In an integrated coking and gasification process for the production of coke and a gaseous stream containing hydrogen and carbon monoxide, comprising the steps of:
- a. reacting a carbonaceous material having a Conradson carbon content of at least 5 weight percent in a coking zone containing a bed of fluidized solids maintained at a temperature ranging from about 850.degree. to about 1400.degree. F. to form coke, said coke depositing on said fluidized solids;
- b. introducing a portion of said solids with a coke deposition thereon into a heating zone operated at a temperature greater than said coking zone temperature to heat said portion of solids;
- c. recycling a first portion of heated solids from said heating zone to said coking zone;
- d. introducing a second portion of said heated solids to a fluid bed gasification zone maintained at a temperature greater than the temperature of said heating zone;
- e. reacting said second portion of said heated solids in said gasification zone with steam and an oxygen-containing gas to produce a hot gaseous stream containing hydrogen and carbon monoxide;
- f. introducing said hot gaseous stream containing hydrogen and carbon monoxide and entrained fines into said heating zone;
- g. passing an additional stream of solids from said gasification zone to said heating zone;
- h. recovering from said heating zone the resulting cooled gaseous stream containing hydrogen and carbon monoxide and entrained fines;
- i. separating from said hydrogen and carbon monoxide-containing gaseous stream at least a portion of said entrained fines as dry fines having a particle size ranging up to about 74 microns, the improvement which comprises:
- j. mixing said portion of said separated dry fines with a transport gas, said portion of said separated dry fines consisting entirely of particles not greater than 74 microns, and
- k. introducing the resulting mixture of dry fines and transport gas into said coking zone at a velocity of at least about 25 feet per second, said dry fines in said mixture consisting entirely of particles not greater than 74 microns.
8 more elements
Dependencies are inferred from the claim text.