Fuel production method and fuel production system

Abstract

A fuel production method from a biomass raw material includes: a synthesis gas production step of causing a biomass raw material, hydrogen, water, and carbon dioxide to react and producing a synthesis gas that includes hydrogen and carbon monoxide; and a Fischer-Tropsch synthesis step of separating a FT offgas that includes hydrogen after a Fischer-Tropsch synthesis reaction of the synthesis gas is performed to thereby produce a Fischer-Tropsch oil, wherein the hydrogen supplied to the synthesis gas production step includes the hydrogen in the FT offgas.

What is claimed is: 
     
         1 . A fuel production method from a biomass raw material, the fuel production method comprising:
 a synthesis gas production step of causing a biomass raw material, hydrogen, water, and carbon dioxide to react and producing a synthesis gas that includes hydrogen and carbon monoxide; and   a Fischer-Tropsch synthesis step of separating a FT offgas that includes hydrogen after a Fischer-Tropsch synthesis reaction of the synthesis gas is performed to thereby produce a Fischer-Tropsch oil,   wherein the hydrogen supplied to the synthesis gas production step includes the hydrogen in the FT offgas.   
     
     
         2 . The fuel production method according to  claim 1 , comprising: no heavy carbon hydride removal step of removing carbon hydride which is included in the FT offgas and in which a carbon number is 5 or more. 
     
     
         3 . The fuel production method according to  claim 1 , comprising:
 a hydrogen supply step of supplying the hydrogen in the FT offgas to the synthesis gas production step.   
     
     
         4 . The fuel production method according to  claim 1 ,
 wherein only the hydrogen in the FT offgas is supplied as the hydrogen.   
     
     
         5 . The fuel production method according to  claim 1 , comprising:
 a gas separation step of separating the FT offgas into a gasification assistance gas that includes hydrogen and a heat source gas that includes carbon hydride.   
     
     
         6 . The fuel production method according to  claim 5 , comprising:
 a heat source gas supply step of supplying the heat source gas as a heat source in the synthesis gas production step.   
     
     
         7 . The fuel production method according to  claim 1 , comprising:
 a water vapor supply step of supplying water vapor as water in the synthesis gas production step such that a mass ratio represented by [mass of water vapor]/[mass of biomass] is less than 1.0.   
     
     
         8 . The fuel production method according to  claim 1 ,
 wherein the FT offgas is obtained by a fractional distillation step(s) of fractionating a liquid fuel after the Fischer-Tropsch synthesis step and after hydrocracking the Fischer-Tropsch oil.   
     
     
         9 . The fuel production method according to  claim 1 ,
 wherein the FT offgas is obtained by a fractional distillation step ( 1 ) of fractionating the Fischer-Tropsch oil after the Fischer-Tropsch synthesis step and before performing hydrorefining or hydrocracking of the Fischer-Tropsch oil.   
     
     
         10 . A fuel production system for producing a fuel from a biomass raw material, the fuel production system comprising:
 a gasification device that causes a biomass raw material, hydrogen, water, and carbon dioxide to react and produces a synthesis gas which includes hydrogen and carbon monoxide;   a Fischer-Tropsch device that separates a FT offgas which includes hydrogen after a Fischer-Tropsch synthesis reaction of the synthesis gas is performed and thereby produces a Fischer-Tropsch oil; and   a hydrogen supply device that supplies the hydrogen in the FT offgas to the gasification device.   
     
     
         11 . The fuel production system according to  claim 10 , comprising:
 no heavy carbon hydride removal device that removes carbon hydride which is included in the FT offgas and in which a carbon number is 5 or more.   
     
     
         12 . The fuel production system according to  claim 10 , comprising:
 only a hydrogen supply device that supplies the hydrogen in the FT offgas to the gasification device as the hydrogen supply device.   
     
     
         13 . The fuel production system according to  claim 10 , comprising:
 a gas separation device that separates the FT offgas into a gasification assistance gas which includes hydrogen and a heat source gas which includes carbon hydride.   
     
     
         14 . The fuel production system according to  claim 13 , comprising:
 a heat source gas supply device that supplies the heat source gas as a heat source in a synthesis gas production step.   
     
     
         15 . The fuel production system according to  claim 10 , comprising:
 a water vapor supply device that supplies water vapor as water to the gasification device such that a mass ratio represented by [mass of water vapor]/[mass of biomass] is less than 1.0.   
     
     
         16 . The fuel production system according to  claim 10 , comprising:
 a fractional distillation device(S) that fractionates a liquid fuel and the FT offgas on a downstream side of the Fischer-Tropsch device and a downstream side of a hydrocracking device that hydrocracks the Fischer-Tropsch oil.   
     
     
         17 . The fuel production system according to  claim 10 , comprising:
 a fractional distillation device (L) that fractionates the Fischer-Tropsch oil and the FT offgas on a downstream side of the Fischer-Tropsch device and an upstream side of a hydrorefining device that performs hydrorefining of the Fischer-Tropsch oil.