Method and apparatus for gasifying with a fluidized bed gasifier having integrated pretreating facilities
AssigneeThe United States of America as represented by the United States Department of Energy
InventorLouis F. Rice
Life of this patent
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Abstract
An integral gasifier including a pretreater section and a gasifier section separated by a distribution grid is defined by a single vessel. The pretreater section pretreats coal or other carbon-containing material to be gasified to prevent caking and agglomeration of the coal in the gasifier. The level of the coal bed of the pretreater section and thus the holding or residence time in said bed is selectively regulated by the amount of pretreated coal which is lifted up a lift pipe into the gasifier section. Thus, the holding time in the pretreater section can be varied according to the amount of pretreat necessary for the particular coal to be gasified.
Claims23
A single vessel gasifier for gasifying carbon-containing solid comprising:
- pretreater section and a gasifier section wherein said gasifier section is arranged substantially vertically over said pretreater section;
- a grid means between said pretreater section and said gasifier section;
- means for introducing carbon-containing solid into the pretreater section;
- means for introducing an oxygen-containing gas into the pretreater section to pretreat carbon-containing solid in said pretreater section;
- means for introducing pretreated carbon-containing solid from the pretreater section into the gasifier section;
- wherein said means for introducing pretreated carbon-containing solid includes at least one substantially vertical lift pipe which is located within said single vessel gasifier and which extends from the bed of solids in said pretreater section into said gasifier section;
- means for regulating the rate of flow of the carbon-containing solid through said lift pipe into the gasifier section in order to selectively control the residence time of carbon-containing solid in the pretreater section.
A method for gasifying carbon-containing solid in a single vessel comprising a pretreater section and a gasifier section arranged substantially vertically over said pretreater with a grid between said sections, said method comprising the steps of:
- introducing carbon-containing solid into a pretreater section of a gasifier;
- introducing an oxygen-containing gas into the pretreater section to pretreat carbon-containing solid;
- introducing gases from said pretreater to said gasifier through said grid;
- lifting pretreated carbon-containing solid from the pretreater section into the gasifier section through a lift pipe which is located within said single vessel and which extends from the bed of solids in the pretreater into said gasifier section;
- and
- regulating the rate of flow of carbon-containing solid from the pretreater section into the gasifier section in order to selectively control the residence time of carbon-containing solid in the pretreater section.
Dependencies are inferred from the claim text.