NOVELTY - Feed stock comprising hydrocarbon or oxygenate is passed to pre-reforming zone (14) to form effluent which is mixed with first air stream and passed to a partial oxidation zone. The oxidized effluent is passed to a reformer and reformed effluent is passed to carbon monoxide reduction zone to form hydrogen (H). H is passed to fuel cell zone to produce electric power and anode waste gas stream with H is removed.    USE - For electric power generation.    ADVANTAGE - Heat insulation is provided as outer layer disposed around the passage to prevent the loss of radiation from the inner wall. The reformed gas is passed through a separator to recover high purity hydrogen stream and non-permeate stream is combusted to provide heat to the reforming chamber. The thermal efficiency of the heat exchangers is improved. The controlling of hydrogen generation is effective and the process is simple.    DETAILED DESCRIPTION - The feed stock comprising hydrocarbon or oxygenate is passed to convection heated pre-reforming zone at pre-reforming temperature to form effluent. The effluent is mixed with first air stream and passed to a partial oxidation zone (24) in a reaction chamber to partially oxidize the effluent. The oxidized effluent is passed to the reforming zone (28) to produce reformed effluent comprising hydrogen (H) and carbon monoxide (CO). The reformed effluent is passed through a exit to CO reduction zone to form hydrogen. The hydrogen gas is passed to a fuel cell zone to produce electric power and anode waste gas (9) stream containing H is removed. The waste gas and second air stream is combusted to produce a flue gas which is used to heat the prereforming zone in heat exchanger having steady state temperature profile.    INDEPENDENT CLAIMS are also included for the following:    (a) Process for producing high purity hydrogen stream;    (b) Combined partial oxidation burner reactor which contains vertically aligned reactor with top and bottom head and side wall as interior reactor zone which has upper, center and lower shell zone. A hollow center sleeve is disposed on the top head and extended into the lower zone. An intermediate partition (with converging diameter along its length) is disposed on the wall of the center zone and the core of the lower zone is communicated with center zone. A feed nozzle is placed at the upper zone. The first oxidation catalyst is placed at core of the center zone and reforming catalyst at the center and core of a lower zone.    DESCRIPTION OF DRAWING(S) - The figure shows schematic block diagram of the process for producing electric power.    Anode waste gas (9)    Preforming zone (14)    Partial oxidation zone (24)    Pre-reforming zone (28)