A system for production of high quality synthesis gas, the system comprising:
- a first dual fluidized bed loop comprising:
- a fluid bed conditioner operable to produce a high quality synthesis gas comprising a first percentage of components other than carbon monoxide and hydrogen from a gas feed comprising a low quality synthesis gas comprising a second percentage of components other than carbon monoxide and hydrogen, wherein the second percentage is greater than the first percentage, wherein the fluid bed conditioner comprises an outlet for a first catalytic heat transfer stream comprising a catalytic heat transfer material and having a first temperature, and an inlet for a second catalytic heat transfer stream comprising catalytic heat transfer material and having a second temperature that is greater than the first temperature;
- a fluid bed combustor operable to combust fuel and oxidant introduced thereto, wherein the fluid bed combustor comprises an inlet fluidly connected with the outlet for a first catalytic heat transfer stream of the fluid bed conditioner, and an outlet fluidly connected with the inlet for a second catalytic heat transfer stream of the fluid bed conditioner;
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- a catalytic heat transfer material;
- a gasifier operable to produce the low quality synthesis gas, wherein the gasifier is located upstream of the fluid bed conditioner and fluidly connected therewith, without intervening heat exchange apparatus, whereby at least a portion of the low quality synthesis gas may be introduced into the fluid bed conditioner as hot gas feed;
- at least one Fischer-Tropsch conversion reactor downstream of the first dual fluidized bed loop and operable to produce a Fischer-Tropsch tailgas, a Fischer-Tropsch catalyst slurry wax purge, and liquid hydrocarbons from at least a portion of the high quality synthesis gas;
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- one or more recycle line selected from the group consisting of recycle lines fluidly connecting the at least one Fischer-Tropsch conversion reactor with the first dual fluidized bed loop, recycle lines fluidly connecting the at least one Fischer-Tropsch conversion reactor with the second dual fluidized bed loop, recycle lines fluidly connecting a low quality synthesis gas outlet of the fluid bed gasifier with an inlet thereof, and recycle lines fluidly connecting a high quality synthesis gas outlet of the fluid bed conditioner with an inlet of the fluid bed gasifier, whereby at least a portion of the Fischer-Tropsch tailgas may be introduced into the fluid bed conditioner, the fluid gasifier, the fluid bed combustor, the second fluid bed combustor, or a combination thereof, a portion of the low quality synthesis gas, the high quality synthesis gas, or both may be introduced into the fluid bed gasifier as fluidization gas, or a combination thereof,
- wherein the gasifier is one fluid bed of a second dual fluidized bed loop comprising:
- a fluid bed gasifier operable to produce low quality synthesis gas from a carbonaceous material and optionally steam, and comprising an outlet for a first heat transfer stream comprising a heat transfer material and unconverted carbonaceous material and having a third temperature, and an inlet for a second heat transfer stream comprising heat transfer material and having a fourth temperature greater than the third temperature;
- a second fluid bed combustor operable to combust oxidant and fuel and produce a flue gas, wherein the second fluid bed combustor comprises a second fluid bed combustor inlet fluidly connected with the outlet for a first heat transfer material stream of the fluid bed gasifier, and a second fluid bed combustor outlet fluidly connected with the inlet for a second heat transfer stream of the fluid bed gasifier;
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- a heat transfer material.