Gasification system
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsGaurang B. Haldipur, Richard G. Anderson, Peter Cherish
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Abstract
A method and system for injecting coal and process fluids into a fluidized bed gasification reactor. Three concentric tubes extend vertically upward into the fluidized bed. Coal particulates in a transport gas are injected through an inner tube, and an oxygen rich mixture of oxygen and steam are injected through an inner annulus about the inner tube. A gaseous medium relatively lean in oxygen content, such as steam, is injected through an annulus surrounding the inner annulus.
Claims10
A method of operating a gasification reactor of the type wherein solid particulate carbonaceous material, oxygen, steam and an oxygen lean medium are fed from an injection means having an upper tip into a vertically disposed vessel housing a combusting fluidized bed to produce a combustible product gas and ash, to prevent substantial sintering of said tip, comprising:
- injecting a mixture of said particulate material and a transport gas vertically upward into said fluidized bed at a velocity of between 30 and 70 feet per second;
- injecting a mixture of oxygen and steam upwardly into said bed and about the radial periphery of said particulate and gas mixture at a velocity of between 50 and 300 feet per second;
- injecting an oxygen lean gaseous medium upwardly into said bed and about the radial periphery of said oxygen and steam mixture at a velocity equal to or less than said oxygen and steam mixture velocity.
A method of operating a gasification reactor of the type wherein solid particulate carbonaceous material, oxygen, steam and an oxygen lean medium are fed from an injection means comprising an upper tip, and a number of vertical concentric tubes into a vertically disposed vessel housing a combusting fluidized bed to produce a combustible product gas and ash, to prevent substantial sintering of said tip, comprising:
- injecting a mixture of said particulate material and a transport gas vertically upwardly and into said fluidized bed through a first vertical tube extending upwardly into said bed at a velocity of between 30 and 70 feet per second;
- injecting a mixture of oxygen and steam vertically upward and into said fluidized bed through an inner annulus formed between said first vertical tube and a second vertical tube which is concentric with and spaced about, said first vertical tube at a velocity of between 50 and 300 feet per second;
- injecting an oxygen lean gaseous medium vertically upwardly and into said fluidized bed through a second annulus formed between said second tube and a third vertical tube which is concentric with, and spaced about, said second vertical tube at a velocity equal to or less than said oxygen and steam mixture velocity.
Dependencies are inferred from the claim text.