Fuel production system and fuel production method

A fuel production method for producing a liquid fuel from a biomass raw material, the method comprising:

• a synthesis gas generating step of gasifying the biomass raw material and generating a synthesis gas containing hydrogen and carbon monoxide in a gasification furnace;
• a liquid fuel producing step of producing the liquid fuel from the synthesis gas generated in the synthesis gas generating step;
• a hydrogen supplying step of supplying hydrogen to a raw material supply area including inside of the gasification furnace and inside a raw material supply path of the biomass raw material leading to the gasification furnace, or to a synthesis gas discharge area at which the synthesis gas is discharged from the gasification furnace;
• a byproduct detecting step of detecting a byproduct amount generated in the synthesis gas generating step;
• and
• a switching step of switching a hydrogen supply location by the hydrogen supplying step between the raw material supply area and the synthesis gas discharge area, based on the byproduct amount detected in the byproduct detecting step, wherein
• the byproduct amount includes an amount of at least one byproduct selected from the group consisting of methane tar, and char.