Gasification system and method

摘要

A system configured for the production of at least one product selected from the group consisting of syngas, Fischer-Tropsch synthesis products, power, and chemicals, the system comprising a dual fluidized bed gasification apparatus and at least one apparatus selected from power production apparatus configured to produce power from the gasification product gas, partial oxidation reactors configured for oxidation of at least a portion of the product gas, tar removal apparatus configured to reduce the amount of tar in the product gas, Fischer-Tropsch synthesis apparatus configured to produce Fischer-Tropsch synthesis products from at least a portion of the product gas, chemical production apparatus configured for the production of at least one non-Fischer-Tropsch product from at least a portion of the product gas, and dual fluidized bed gasification units configured to alter the composition of the product gas. Methods of operating the system are also provided.

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 heated particulate heat transfer material from the combustion flue gas, and introducing same directly into the gasifier, via a gasifier seal pot, thus providing heat for pyrolysis; and at least one step selected from the group consisting of:
introducing a supplemental fuel into the combustor;recovering heat from the gasification product gas, the combustion flue gas, or both;introducing a catalyst, a sulfur-extraction component, a carbon dioxide removal component, or a combination thereof directly or indirectly into the gasifier; andintroducing a purge gas with or as a part of the carbonaceous feedstock.