The following links contain a video demonstration of dust explosions and combustion.
Videos are available in both avi and quicktime file formats.
The materials required for the demonstration are shown below in two still images. The fuel, in this case commercial cornstarch, is placed into a small container. After this container is placed inside the large coffee can, the small container is connected to an external tube through the side wall of the coffee can. A burning candle is placed inside the coffee can and the can is sealed. When the cornstrach is dispersed as a finely divided powder by blowing through the tube, the dust is ignited by the candle.