NOVELTY - A fuel gas purification apparatus has carbonizer (1), furnace (2), airtight container (3), gas inlet tube (5) and fuel gas supply tube (6). A biomass is thermally decomposed by carbonizer to generate pyrolysis gas and carbonized material. The carbonized material is supplied and burnt in the furnace. The heat of the carbonized material is used for melting carbonate and the molten carbonate (4) is accommodated in the airtight container.    USE - Fuel gas purification apparatus is used for electric power generation system and fuel synthesis system (both claimed).    ADVANTAGE - The fuel gas purification apparatus has simple structure and provides high calorie fuel gas of high purity.    DETAILED DESCRIPTION - A fuel gas purification apparatus has carbonizer, furnace, airtight container, gas inlet tube and fuel gas supply tube. A biomass is thermally decomposed by carbonizer to generate pyrolysis gas and carbonized material. The carbonized material is supplied and burnt in the furnace. The heat of the carbonized material is used for melting carbonate and the molten carbonate is accommodated in the airtight container. The gas inlet tube is arranged such that the pyrolysis gas is introduced into the molten carbonate of the container. The fuel gas supply tube is arranged such that the fuel gas, which is the pyrolysis gas passed through the inlet tube, circulated through the molten carbonate and purified by reaction with the molten carbonate, is sent from the airtight container to the exterior of the furnace. INDEPENDENT CLAIMS are included for the following:    (1) electric power generation system, which has the fuel gas purification apparatus and electric power generating unit (20) for producing electric power using fuel gas from the fuel gas purification apparatus; and    (2) fuel synthesis system, which has the fuel gas purification apparatus, liquid fuel synthesizing apparatus for synthesizing liquid fuel from the fuel gas of purification apparatus, and water supply unit for supplying water to the carbonizer or airtight container such that ratio of moisture content fuel gas supplied to the exterior of furnace is controlled.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic block diagram of electric power generation system. (Drawing includes non-English language text)    Carbonizer (1)    Furnace (2)    Airtight container (3)    Molten carbonate (4)    Inlet tube (5)    Fuel gas supply tube (6)    Carbonized material inlet tube (7)    Hydroxide supply unit (8)    Electric power generating unit (20)