Gasification system and method

A system configured for the production of at least one product selected from the group consisting of synthesis gas, Fischer-Tropsch synthesis products, power, and chemicals, the system comprising:

• a dual fluidized bed gasification apparatus comprising:
• a gasifier and a combustor, wherein the combustor is configured for heating a particulate heat transfer material, thus producing a combustor flue gas;
• and wherein the gasifier is configured to receive the heated particulate heat transfer material and a carbonaceous feedstock, whereby the heated particulate heat transfer material provides heat for endothermic gasification of the carbonaceous feedstock, thus producing a gasification product gas comprising hydrogen and carbon monoxide, and entrained particulate material;
• a combustor particulate separator configured to separate heated particulate heat transfer material from the combustor flue gas, to provide a particulate-reduced flue gas;
• at least one expander downstream of the combustor particulate separator and configured to recover energy from the particulate-reduced flue gas;
• a J-valve configured to prevent backflow of material from the gasifier into the at least one combustor particulate separator;
• wherein the J valve is directly connected with the combustor particulate separator, whereby all of the separated heated particulate heat transfer material is introduced directly from the at least one combustor particulate separator into the J valve, and wherein the J valve comprises a single outlet, said single outlet directly connected with an inlet of the gasifier;
• and
• power production apparatus configured to produce power from a first portion of the gasification product gas and Fischer-Tropsch synthesis apparatus configured to produce Fischer-Tropsch synthesis products from a second portion of the gasification product gas.

A system configured for the production of at least one product selected from the group consisting of synthesis gas, Fischer-Tropsch synthesis products, power, and chemicals, the system comprising:

• a dual fluidized bed gasification apparatus comprising:
• a gasifier and a combustor, wherein the combustor is configured for heating a particulate heat transfer material, thus producing a combustor flue gas;
• and wherein the gasifier is configured to receive the heated particulate heat transfer material and a carbonaceous feedstock, whereby the heated particulate heat transfer material provides heat for endothermic gasification of the carbonaceous feedstock, thus producing a gasification product gas comprising hydrogen and carbon monoxide, and entrained particulate material;
• and
• at least two gasifier particulate separators configured to separate gasification product gas from the entrained product, each gasifier particulate separator comprising a dipleg extending a distance into a combustor seal pot;
• at least two combustor particulate separators configured to separate heated particulate heat transfer material from the combustor flue gas, each combustor particulate separator comprising a dipleg extending a distance into a gasifier seal pot;
• or least two gasifier particulate separators and at least two combustor particulate separators,
• wherein the minimum dipleg to dipleg separation within a seal pot is at least 10 inches;
• and
• power production apparatus configured to produce power from a first portion of the gasification product gas and Fischer-Tropsch synthesis apparatus configured to produce Fischer-Tropsch synthesis products from a second portion of the gasification product gas.