Gasification system and method

摘要

A method including introducing a carbonaceous feedstock and a heated heat transfer material into a gasifier, whereby at least a portion of the carbonaceous material is pyrolyzed; removing a gasification product gas comprising, entrained therein, char, particulate heat transfer material, and optionally unreacted carbonaceous feedstock; separating a solids product comprising char, heat transfer material and optionally unreacted carbonaceous material from the gasification product gas; heating at least a portion of the solids product via a combustor, thus producing a heated portion of the solids product and a combustor flue gas, wherein a portion of the heat for heating is obtained via combustion of the char; separating the heated portion from the flue gas, and introducing the separated heated portion into the gasifier, providing heat for pyrolysis; and utilizing at least a portion of the gasification product gas for Fischer-Tropsch synthesis and/or power production.

主权项

1. A method comprising:
introducing a carbonaceous feedstock and a heated particulate heat transfer material into a gasifier comprising a fluidized bed, whereby at least a portion of the carbonaceous material is pyrolyzed to produce a gasification product gas comprising hydrogen and carbon monoxide, and wherein the fluidized bed comprises particulate heat transfer material fluidized by introducing a gasifier fluidization gas into the gasifier; removing, from a lower average density entrained space region of the gasifier, a gasification product gas comprising, entrained therein, char, particulate heat transfer material, and optionally unreacted carbonaceous feedstock; separating at least one solids product comprising char, particulate heat transfer material and optionally unreacted carbonaceous material from the gasification product gas, providing a particulate-reduced product gas; heating at least a portion of the at least one solids product by passing same through a combustor, thus producing a heated portion of the at least one solids product and a combustor flue gas, wherein at least a portion of the heat for heating is obtained via combustion of the char in the at least a portion of the at least one solids product; separating the heated portion of the at least one solids product from the flue gas in a combustor separator, and introducing the separated heated portion of the at least one solids product directly into a gasifier seal pot configured to prevent backflow of material from the gasifier, and directly therefrom into the gasifier, thus providing heat for pyrolysis; and subjecting at least a portion of the gasification product gas to Fischer-Tropsch synthesis, producing power from at least a portion of the gasification product gas, or both.