Measurement method of size and velocity of burning pulverized coal particles

Based on the radiation property of pulverized coal flame,an imaging method using blue light back-illumina- tion was proposed,which could avoid or mitigate the effect of self-illumination of flame and obtain static or moving coal particle images. Single Frame Long Exposure (SFLE) measurement method was employed to simultaneously obtain the size and velocity of the burning coal particle from its moving trajectory in the image. In the flat flame entrained flow combustor system based on McKenna burner,an industrial camera was used to carry out experimental investigation on pulverized coal combustion and obtain the information of size and velocity of burning coal at different distances from the burner outlet. The measuring result of the particle size near the exit of burner nozzle agrees with the sieving result of the coal sample before adding to the feeder. The variation of size and velocity with the height above the nozzle outlet proves the feasibility of this method which lay a foundation for the visualization measurement study of the process of pulverized coal combustion.