Fuel cell cogeneration device with hydrogen burner

The utility model provides a fuel cell combined heat and power device with a hydrogen burner, belongs to the technical field of fuel cell combined heat and power, and solves the problem of poor economical efficiency of a high-power fuel cell caused by lack of effective treatment on tail exhaust hydrogen in the prior art. The system comprises a plurality of electric piles, an expansion machine, a gas-liquid separation tank, a deoxidation, denitrification and dehydration device and a hydrogen burner. Wherein an air inlet of each electric pile is connected with a pinch roller cavity gas outlet of the expansion machine, an air tail gas outlet of each electric pile is connected with a turbine cavity gas inlet of the expansion machine, and a hydrogen tail gas outlet of each electric pile is connected with a hydrogen input end of the hydrogen burner after sequentially passing through the gas-liquid separation tank and the deoxidation, denitrification and dehydration device; and the output end of the hydrogen burner