System and method for dual fluidized bed gasification

A system for continuous dry reforming, the system comprising:

• a first dual fluidized bed loop comprising:
• a fluid bed conditioner operable to produce a synthesis gas from a gas feed comprising carbon dioxide and at least one selected from methane, ethane, propane, and higher hydrocarbons, 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 comprising an inlet fluidly connected with the outlet for a first catalyst stream of the conditioner, and an outlet fluidly connected with the inlet for a second catalytic heat transfer stream of the fluid bed conditioner, and operable to combust fuel and oxidant introduced thereto;
• and
• a catalytic heat transfer material.

A method for deep desulfurization of synthesis gas, the method comprising:

• producing a flue gas and a low quality synthesis gas in a first dual fluidized bed loop by:
• introducing a carbonaceous material and optionally steam into a fluid bed gasifier comprising a heat transfer media;
• 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 first fluid bed combustor, wherein the first heat transfer stream has a first temperature;
• introducing oxidant into the first fluid bed combustor whereby unconverted carbonaceous material in the first heat transfer stream is combusted and the temperature of the heat transfer media is raised;
• extracting a second heat transfer stream comprising heat transfer media and having a second temperature from the first fluid bed combustor and introducing at least a portion of the second heat transfer stream into the fluid bed gasifier, wherein the second temperature is greater than the first temperature;
• introducing a compound capable of reacting with sulfur to produce sulfate, sulfide or both into the first dual fluidized bed loop;
• extracting a purge stream comprising ash, sulfate, halide, or a combination thereof from the second heat transfer stream;
• and
• extracting a low quality synthesis gas stream comprising less than 1000 ppmv sulfur from the fluid bed gasifier of the first dual fluidized bed loop.

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 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, the fluid bed conditioner one fluidized bed reactor of a dual fluidized bed loop;
• 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.

A method for continuous dry reforming, the method comprising:

• introducing a feed comprising carbon dioxide and at least one selected from methane and propane into a fluid bed conditioner operated at a conditioning temperature, wherein the fluid bed conditioner is one fluid bed of a dual fluidized bed loop and is configured to convert at least a portion of said feed into synthesis gas components;
• 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 and a flue gas into a fluid bed combustor, wherein the fluid bed combustor is configured to regenerate the catalyst via combustion;
• extracting a second catalytic heat transfer stream comprising catalytic heat transfer material and having a second 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 synthesis gas from the fluid bed conditioner.