Patent ID: 8591610

Claim:
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, the method comprising: providing a flue gas, and a low-quality synthesis gas comprising greater than the desired percentage of non-synthesis gas components; introducing the low quality synthesis gas into a fluid bed conditioner, wherein the fluid bed conditioner is one fluidized bed reactor of a first dual fluidized bed loop; introducing the flue gas into a first fluid bed combustor, wherein the first fluid bed combustor is the second fluidized bed reactor of the first 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 first fluid bed combustor of the first dual fluidized bed loop; extracting a second catalytic heat transfer stream comprising catalytic heat transfer material and having a second temperature greater than the first temperature from the first fluid bed combustor of the first dual fluidized bed loop, 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, wherein providing the flue gas and the low quality synthesis gas comprises: introducing a carbonaceous material and optionally steam into a fluid bed gasifier comprising a heat transfer media, wherein the fluid bed gasifier is one fluidized bed reactor of a second dual fluidized bed loop; extracting a first heat transfer stream comprising heat transfer media and optionally unconverted carbonaceous material from the fluid bed gasifier and introducing at least a portion of the first heat transfer stream into a second fluid bed combustor, wherein the first heat transfer stream has a third temperature, and wherein the second fluid bed combustor is the second fluidized bed reactor of the second dual fluidized bed loop; introducing oxidant into the second fluid bed combustor whereby unconverted carbonaceous material in the first heat transfer stream is combusted, the temperature of the heat transfer media is raised, and the flue gas is produced; extracting a second heat transfer stream comprising heat transfer media and having a fourth temperature from the second fluid bed combustor, and introducing at least a portion of the second heat transfer stream into the fluid bed gasifier, wherein the fourth temperature is greater than the third temperature; and extracting the low quality synthesis gas from the fluid bed gasifier of the second dual fluidized bed loop.