NOVELTY - A hydrocarbon fuel is processed by reforming hydrocarbons by reacting them with carbon dioxide and water and sensible heat from power generation reaction to produce hydrogen gas and carbon monoxide.    USE - For processing hydrocarbon fuel, e.g., methane, higher hydrocarbons, and alcohol, and also including liquid fuel, solid fuel, e.g., coal or gas fuels.    ADVANTAGE - The invention allows hydrocarbon fuels, including solid fuels, to be utilized in a fuel cell with minimal auxiliary equipment, e.g., reformers and heat exchangers, which in turn leads to power generation system with reduced size, weight and cost. It can also be applied to a high temperature fuel cell configuration and types including solid oxide fuel cells and molten carbonate fuel cells.    DETAILED DESCRIPTION - Processing of hydrocarbon fuel involves adding oxygen from anode (3, 12) of a fuel cell in the form of carbon dioxide and water; reforming the hydrocarbons by reacting them with carbon dioxide and water and sensible heat from power generation reaction to produce hydrogen gas and carbon monoxide; reacting the hydrogen gas and carbon monoxide at the anode to produce power; and mechanically mixing the fuel and the reaction products.    INDEPENDENT CLAIMS are included for the following:    (a) A solid fuel reactor comprising a high temperature fuel cell having an anode and mechanism for circulating the anode reaction products so that the anode reaction products alternately contact the solid fuel and the anode;    (b) A fuel cell power generation comprising the reactor and a second stage fuel cell stack where the fuel and reaction product mixture exhaust stream having fuel gas stream to the second stage fuel cell stack;    (c) A fuel cell including a anode passage and an anode gas recirculation loop in which fuel is added to the anode gas stream at an intermediate point in the anode passage such that the fuel is mixed with anode reaction products, and an oxidant flows in a cathode (5, 14) passage parallel to the anode passage;    (d) A multiple manifold hollow cathode supported solid planar bipolar fuel cell stack comprising multiple cells where the oxidant flows between oxidant inlet and oxidant outlet holes through oxidant passages (24) within the hollow cathodes, fuel flows between fuel inlet and fuel outlet holes through fuel passages between adjacent cells; one side of each cell is coated with electrolyte (4, 13) and anode layers; the opposite sides are coated with a lanthanum chromite; interconnect layers and a conductive current distribution layers; and current flows from one cell to the next through a multiplicity of contact areas between the anode of one cell and the conductive current distribution layer of the next cell; and    (e) An integrated fuel cell comprising fuel cell power generation system together with mechanism for interconnecting the reactor and the second stage fuel cell stack, common thermal enclosure mechanism, heat recovery mechanism, fluid pumping mechanism, fuel introduction mechanism, startup mechanism; and control mechanism.    DESCRIPTION OF DRAWING(S) - The figure is a schematic view of the operating principle of the mixed fluid internal fuel reforming concept.    Second stage fuel cell (1)    Anode (3, 12)    Electrolyte (4, 13)    Cathode (5, 14)    Oxidant passages (24)