Elements of a Fire:
- Combustible Dust (fuel);
- Ignition Source (heat);
- Oxygen in the air (oxidizer);
Additional elements needed for a Combustible Dust Explosion:
- Dispersion of particles in sufficient quantity and concentration
- Confinement of a dust cloud
Basically any combustible material and some considered non-combustible (your fuel) in the right concentration suspended in the air could lead to an explosion with potentially deadly consequences