Flame detection cooling fan system

The utility model discloses a flame detection cooling fan system. The device comprises a flame detection cooling fan for providing flame detection cooling air, and a sealing fan, the output end of theflame detection cooling fan is communicated with a fan main pipe extending to the flame detection probe; the output end of the sealing fan is communicated with a sealing air main pipe, the sealing air main pipe is communicated with a fan main pipe through a pipeline, a second check valve and a second quick-closing door are sequentially arranged on the pipeline, a first quick-closing door, a firstcheck valve and a filter screen are sequentially arranged on the sealing air main pipe in the extending direction of the fire detection probe, the pipeline is communicated with a side pipe, and a third stop valve is arranged on the side pipe. When the fire detection cooling fan breaks down, supply of fire detection cooling air can be kept, so that MFT accidents of a boiler are avoided, and the power utilization rate of a