NOVELTY - The pyrolyzer (100) has an oven comprising an oven shell defining an interior. A rotary conveyor moves a feedstock from a feed inlet to a discharge outlet through the interior. An outer shell (110) surrounds the oven and defines a space between the oven shell and the outer shell. A set of heaters is directed into the space and controlled independently. A set of dividers is connected to the outer shell and spanned to the oven within the space. The dividers define different temperature control zones, where each temperature control zone includes the heaters.    USE - Continuous-feed pyrolyzer for generating synthesis gas from carbon-based feedstock e.g. solid fuel such as coal and waste coal, and carbon- waste products such as tires, biomass, municipal solid waste and auto shredder residue, in a steam power plant.    ADVANTAGE - The pyrolyzer allows a feedstock material to be prepared for transformation such that eddy current magnets are used to remove metallic materials from the feedstock and remaining material is chopped, cut and shredded to reduce to size usable by the pyrolyzer. The pyrolyzer allows an exhaust pipe to carry high temperature exhaust to an oxidizer to assist in steam generation process so as to improve efficiency of a conveying system. The pyrolyzer allows an airlock feeder assembly to prevent free flow of oxygen into the interior. The pyrolyzer is controlled and varied in such a manner so as to maximize complete transformation of feedstock progressing along a conveyor cradle with burners in the zones being activated to maintain optimum temperature throughout the pyrolyzer, thus minimizing number of cold or hot spots with the oven. The pyrolyzer utilizes different temperature control zones for efficient or complete production of synthesis gas from the feedstock.    DETAILED DESCRIPTION - The oven shell is fabricated from high temperature alloys e.g. Haynes HR-160 and Haynes 230. INDEPENDENT CLAIMS are also included for the following:    (1) a method for repairing an oven of a continuous-feed pyrolyzer    (2) a method for operating a continuous-feed pyrolyzer.    DESCRIPTION OF DRAWING(S) - The drawing shows a front perspective view of a continuous-feed pryrolyzer.    Continuous-feed pryrolyzer (100)    Rotary airlock feeder assembly (102)    Rotary discharge airlock assembly (104)    Waste heat exhaust removal port (106)    Outer shell (110)    Stand (156)