Atmosphere and fire source are both the factors that can lead to the explosion of metal powders

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Atmosphere that leads to the explosion of metal powders

Atmosphere that exists in the area where the dust rises will greatly influence the explosion characteristics of dust. The oxygen content can influence the ignition and explosion or the combustion extension of metal, in which some metal will burn under very little oxygen, while the other metals can only burn under high oxygen content.

explosion of metal powders

Some metal powders, such as lithium powder, magnesium powder and hafnium powder that react with gases (such as carbon dioxide) rather than reacting with air, can burn in the dust cloud. As the flammable gases and vapor can obviously reduce explosive limit, they can intensively influence the combustion and explosion parameters.

Due to the compatibility between metal and water, the relative humidity of the ambient air may promote or inhibit the extension of explosion and combustion. Although the pressure and temperature of the atmosphere will influence the flammability and explosion severity to a certain degree, they cannot influence as large as the oxygen content.

Fire source that leads to the explosion of metal powders

Fire source energy and energy type will influence the combustion and explosion strength. Generally, fire source is derived from heat, mechanical spark, electricity or electrostatic discharge spark and flame. In the dust cloud explosion, when the fire source is strong (the ignition energy is large), the pressure will increase high and fast.