There is a certain dust concentration
The measure unit in dust explosion is different from that in gas explosions. Gas explosion expresses as volume percentage. While dust is in terms of the mass of particles contained in a unit volume. And the unit is g/ m3 or mg/L. If it is too low, the distance between dust particles will be too large. Then the fire will be hard to spread.
Have a certain oxygen content
Oxygen is the basis for dust burning.
There is sufficient ignition source
The min ignition energy required for dust explosion is 1-2 orders of magnitude greater than that of gas explosion. The min ignition energy of most dust clouds is in the range of 5mj-50mj.
It must be in a suspended state
The dust must suspends. That is a dust cloud state. Then it can increase the gas-solid contact area and speed up the reaction speed.
In a relatively closed space
The dust cloud must be in a closed space so that the pressure and temp can rise sharply. Then it will explode.
Source of dust
During the production process, crush, grind and melt solid materials can cause dust. Besides, load, unload, transport and mix powder can cause dust. In another hand, if there was poor protection method during the oxidation, there will also be dust.
Main operations that generate dust
Rock drilling, blasting, mining, etc. Besides, tunnel, quarry and other projects can release large volume of dust. In the metal smelt industry, it needs to crush, process and smelt raw material. While during these procedures, there will be dust. In addition, in some special industries like glass and cement, there will be great dust. Besides above industries, there will be dust in welding work and surface treatment.
If you work on such works, take some measures to collect the dust. While the dust hose is a good choice. Contact Orientflex now and get the best solution.