NOVELTY - Vapors of hydrocarbons and water are reacted at 200 degrees C and 100 kPa to form a reformate stream containing hydrogen. A separator (14) purifies hydrogen (H2) from the reformate and forms a retenate stream (42). Retenate and exhaust gas are mixed and recycled. Exhaust gas is oxidized in a combustor (94) and a portion of heat is passed to a reforming zone, hydrocarbon, water stream and/or retenate recycle stream.    USE - For fuel cells in cars, buses and industrial plants.    ADVANTAGE - The reforming reactor in the reactor system reduces the external requirement for water thereby reducing the size, weight and complexity of the water recovery. The energy efficiency of a fuel battery using hydrogen is increased.    DETAILED DESCRIPTION - A hydrocarbon stream (21) and a water stream (25) in a gaseous form are passed to a reforming zone (20) containing catalyst. The vapors are reacted at 200 degrees C and 100 kPa to form a reformate stream containing hydrogen. The reformate is passed to a separator to obtain purified H2 (40) and a retenate stream. Retenate and exhaust gas are mixed in the ratio 1:20-20:1. The retenate stream is recycled and the exhaust gas is passed to a combustor, where oxidation is performed in the oxygen and a portion of heat generated is passed to the reforming zone, hydrocarbon, water stream and/or retenate recycle stream.    An INDEPENDENT CLAIM is also included for an integrated system (10) for producing and supplying hydrogen to the fuel cell (52) in which a separating unit has an inlet and an outlet for discharging the retenate stream and purified hydrogen stream. A retenate recycle unit directs the retenate stream to the reforming zone. The combustor has an inlet and an outlet for receiving and exhausting the combustion gas stream. A heat transfer device transfers the heat in the combustor to the reforming zone, hydrocarbon, water stream and/or retenate stream.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the integrated system for supplying hydrogen to a fuel cell.    Integrated system (10)    Separator (14)    Reforming zone (20)    Hydrocarbon stream (21)    Water stream (25)    Purified hydrogen stream (40)    Retenate stream (42)    Fuel cell (52)    Combustor (94)