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Down-flow moving-bed gasifier with catalyst recycle

United States Patent

April 20, 1999
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
The gasification of coal and other carbonaceous materials by an endothermic gasification reaction is achieved in the presence of a catalyst in a down-flow, moving-bed gasifier. Catalyst is removed along with ash from the gasifier and is then sufficiently heated in a riser/burner by the combustion of residual carbon in the ash to volatilize the catalyst. This volatilized catalyst is returned to the gasifier where it uniformly contacts and condenses on the carbonaceous material. Also, the hot gaseous combustion products resulting from the combustion of the carbon in the ash along with excess air are introduced into the gasifier for providing heat energy used in the endothermic reaction.
Halow; John S. (Waynesburg, PA)
The United States of America as represented by the United States (Washington, DC)
08/ 694,575
August 9, 1996
The United States Government has rights in this invention pursuant to the employer-employee relationship of the U. S. Department of Energy and the inventor.