NOVELTY - A liquid combustible fuel production system comprises feed stream containing feedstock pieces having polymeric materials, metal pieces and water in carrier, and reactor section. Reactor section has input end receiving feed stream and output end. Reactor section has reactor vessels causing carrier liquid to flow through vessel(s). Temperature on inner surface of reactor is raised to 250-455 degrees C. Metal pieces and water at input end is present in favorable quantity with respect to feedstock particles to react, and feedstock pieces are converted into combustible liquid fuel.    USE - System is used for producing liquid combustible fuel.    ADVANTAGE - The liquid combustible fuel is produced without affecting environment and without producing carbon dioxide as byproduct.    DETAILED DESCRIPTION - A liquid combustible fuel production system comprises a feed stream containing a slurry of feedstock pieces having carbon-containing polymeric materials free of each of halogen, sulfur and nitrogen atoms, a catalytic amount of metal pieces of group VIII, IB, IIB, IIIA, or IVA metal particles comminuted to pass through No.18 Standard Sieve and water in a non-aqueous carrier liquid, and a reactor section. The reactor section has an input end receiving the feed stream and an output end outputting a reacted feed stream. The reactor section has reactor vessels constructed to cause the carrier liquid to flow through reactor vessel(s) in plug flow at a controlled flow velocity and residence time within reactors. The temperature on the inside surface of the reactor is raised progressively and in a controlled manner to 250-455 degrees C. The reactor has pressure of 20-50 atmospheres. The reactor(s) has a device to measure the viscosity and the temperature of the contents exiting reactor, and a device to adjust the temperature of the contents of the reactor and the time for flowing carrier liquid through the reactor based on the viscosity measurement. The metal pieces and water input at input end of the reaction section is present in favorable quantity with respect to the feedstock particles to react, and feedstock pieces are converted into combustible liquid fuel at the output end of the reaction section. An INDEPENDENT CLAIM is included for chemical reactor.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of liquid combustible fuel production system.    Fuel production plant (10)    Size reduction section (200)    Reaction section (300)    Finishing section (400)