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AssigneeFront Line Bioenergy, LLC
InventorsThomas J Paskach, Jerod Smeenk
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A method and assembly for producing substantially tar free product gas from gasification of carbonaceous material. The assembly preferably includes a first stage gasifier to produce char-ash and tar laden product gas and a second stage gasifier which has a char-ash heating zone, at least one cyclone, and at least one standpipe for the purpose of allowing selective delivery of char-ash to the char-ash heating zone. A char-ash heating zone that utilizes oxidation of char-ash is preferred and this results in the heat required to convert tar, additional yield of product gas, and an oxidized, activated carbon surface to facilitate tar conversion in the riser, thereby reducing the temperature required to achieve the desired tar conversion. Alternatively, external heat is supplied to the heating zone.
A method for producing product gas substantially free of tar by gasification of carbonaceous material wherein said method comprises:
An assembly for producing product gas substantially free of tar from gasification of carbonaceous material, said assembly comprising a first stage gasifier for producing char-ash and tar laden product gas and a second stage gasifier for converting tar to less problematic tar.
An assembly for increasing conversion of carbon in carbonaceous materials, said assembly comprising a first stage gasifier for producing char-ash particles and tar laden product gas and a second stage gasifier for converting at least a portion of said tar to less problematic tar and partially oxidizing and gasifying said char-ash thereby increasing said carbon conversion and providing heat required for said tar conversion reactions.
An assembly for gasifying a carbonaceous material to produce a product gas substantially free of tar, said assembly comprising a first stage gasifier in fluid communication with a second stage gasifier wherein said first stage gasifier comprises a bubbling or circulating fluid bed and produces char-ash and tar laden product gas and the second stage gasifier comprises a char-ash heating zone and accepts said char-ash and tar laden product gas from said first stage gasifier for selective delivery of said char-ash to said char-ash heating zone.
Dependencies are inferred from the claim text.