NOVELTY - The system comprises a continuous pyrolytic unit (10) for producing a pyro gas, a synthesis gas production unit (30) for converting the pyro gas into a synthesis gas, a gas-to-liquid unit (50) for converting the synthesis gas into a fuel, a pyro gas clean-up unit (20) for removing pollutants from the pyro gas, a synthetic gas clean-up unit (40) for removing pollutants from the synthesis gas, and a feed pretreatment unit. The synthesis gas production unit comprises a steam reformer. The gas-to-liquid unit comprises a Fischer-Tropsch system.    USE - The system is useful for converting a solid fuel such as municipal solid waste, municipal sludge, bio-solid, rubber, plastic, coal, organic waste and/or inorganic waste into a liquid fuel such as diesel, gasoline, jet fuel, alcohols and/or methane, or gas fuel (all claimed).    ADVANTAGE - The system is capable of economically converting a solid fuel into a liquid or gas fuel with less production of carbon dioxide, reduces the entrainment of small ash and carbon particles, which is very clean and has a high calorific value, and eliminates the emissions of toxic gases such as nitrogen dioxide and sulfur dioxide during the conversion.    DETAILED DESCRIPTION - The system comprises a continuous pyrolytic unit (10) for producing a pyro gas, a synthesis gas production unit (30) for converting the pyro gas into a synthesis gas, a gas-to-liquid unit (50) for converting the synthesis gas into a fuel, a pyro gas clean-up unit (20) for removing pollutants from the pyro gas, a synthetic gas clean-up unit (40) for removing pollutants from the synthesis gas, and a feed pretreatment unit. The synthesis gas production unit comprises a steam reformer. The gas-to-liquid unit comprises a Fischer-Tropsch system. The pyro gas clean-up unit comprises a carbon dioxide removal unit and a hydrogen sulfide removal unit. The synthetic gas clean-up unit comprises a hydrogen sulfide removal unit. The continuous pyrolytic unit comprises a low nitrogen oxide (NOx) emission burner. An INDEPENDENT CLAIM is included for a method for converting a solid fuel into a fuel.    DESCRIPTION OF DRAWING(S) - The diagram shows a flow diagram of a system for converting solid fuel into a liquid or a gas fuel.    Pyrolysis unit (10)    Pyro gas clean-up unit (20)    Synthesis gas production unit (30)    Synthetic gas clean-up unit (40)    Gas to liquid unit. (50)