NOVELTY - A hydrogen generator comprises a housing (10); a barrier wall (40) to divide a space in the housing into a first chamber (11) and a second chamber (12); a fuel reformer (30) installed in the first chamber; a first burner (20) installed in the first chamber to heat the fuel reformer; a shift reactor (60) installed in the second chamber; a second burner (50) formed in the barrier wall to heat the shift reactor; and first and second igniters (22, 52) that respectively ignite the first and second burners.    USE - For generating hydrogen.    ADVANTAGE - The hydrogen generator reduces the time taken to begin a shift reaction in the shift reactor. The hydrogen generator has a simple structure, and can rapidly raise the temperature of the shift reactor.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of operating the hydrogen generator having double burners. A gas inlet/outlet (44) for passing gases from the first chamber into the second chamber is formed in the barrier wall. The second igniter is an ignition plug. Fuel is supplied to both the first and second burners by a single fuel supply line. Hydrogen is generated using a shift reaction. A first pipe (70) supplies hydrocarbon and water from the outside of the housing to the fuel reformer. A second pipe (80) conveys reformed hydrogen gas, carbon dioxide, carbon monoxide, and/or water vapor from the fuel reformer to the shift reactor. A third pipe (90) discharges hydrogen gas from the shift reactor to the outside of the housing. A through hole is formed in the barrier wall to pass exhaust gases produced from the first burner to indirectly heat the second chamber when the fuel is burned by the first burner. The fuel reformer reforms hydrocarbons. The shift reactor reduces carbon monoxide.    DESCRIPTION OF DRAWING(S) - The figure is a schematic drawing of the hydrogen generator having double burners.    Housing (10)    First chamber (11)    Second chamber (12)    First burner (20)    First and second igniters (22, 52)    Fuel reformer (30)    Barrier wall (40)    Gas inlet/outlet (44)    Second burner (50)    Shift reactor (60)    First pipe (70)    Second pipe (80)    Third pipe (90)