Abstract The present invention discloses a power supply device, particularly to a power supply device that can ensure safe operation of a waste heat boiler and a rotary kiln using a water film dust remover. The power supply device according to the present invention is simple in structure, low in price, and exhibits a long working life and a good load applicability, particularly adapted to inductive loads such as an electrical machine. The present invention can ensure the flue shutter to act timely in the event of power failure of the system, and effectively prevent the flue gas in the rotary kiln system and the waste heat boiler system from generating a positive pressure to eliminate the hidden danger of explosion of the water film dust remover and ensure safety of workers and equipment.
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