System and method for dual fluidized bed gasification

摘要

A method of producing a high quality synthesis gas comprising less than a desired percentage of non-synthesis gas components and a desired mole ratio of hydrogen to carbon monoxide by providing a low quality synthesis gas comprising greater than the desired percentage; introducing the low quality synthesis gas into a conditioner; introducing a flue gas into a combustor; extracting a first catalytic heat transfer stream from the conditioner, and introducing at least a portion of the first catalytic heat transfer stream into the combustor; extracting a second catalytic heat transfer stream from the combustor, and introducing at least a portion of the second catalytic heat transfer stream into the conditioner; extracting a spent flue gas from the combustor; and extracting from the conditioner the high quality synthesis gas comprising the desired percentage and the desired mole ratio.

主权项

1. A method of producing a high quality synthesis gas comprising less than a desired percentage of non-synthesis gas components, which are components other than hydrogen and carbon monoxide, and a desired mole ratio of hydrogen to carbon monoxide, the method comprising:
producing a low quality synthesis gas comprising greater than the desired percentage of non-synthesis gas components via gasification of a carbonaceous feed in a gasifier; introducing the low quality synthesis gas into a fluid bed conditioner, wherein the fluid bed conditioner is one fluidized bed reactor of a dual fluidized bed loop, and wherein the fluid bed conditioner is operated at a higher temperature than the gasifier; introducing a flue gas into a fluid bed combustor, wherein the fluid bed combustor is the second fluidized bed reactor of the dual fluidized bed loop; extracting a first catalytic heat transfer stream comprising a catalytic heat transfer material and having a first temperature from the fluid bed conditioner, and introducing at least a portion of the first catalytic heat transfer stream into the fluid bed combustor; extracting a second catalytic heat transfer stream comprising catalytic heat transfer material and having a second temperature greater than the first temperature from the fluid bed combustor, and introducing at least a portion of the second catalytic heat transfer stream into the fluid bed conditioner; and extracting high quality synthesis gas comprising the desired percentage of non-synthesis gas components and the desired mole ratio of hydrogen to carbon monoxide from the fluid bed conditioner.