The authors present a new kind of integrated gas generator, which can convert flammable gas including hydrogen from emulsified kerosene by a catalytic reforming reaction. The internal flow process is simulated to evaluate the design for the new gas generator. A swirling combustor can generate stable and short recirculation zones so that it provides enough heat to catalytic reforming reaction. The effects of different parameters on the catalytic reaction are investigated through a number of experiments and optimum parameters are deduced. The results show that an outlet flammable gas composition of 1530% can be obtained when the catalyst temperature ranges from 500 to 700 degrees C and a blending-water ratio in the emulsified kerosene is 10%. A hydrogen volume content of 416% can be achieved in the fuel-rich flammable gases. The optimal excessive air ratio in the burning section is around 0.65 or 0.85.