Dust Explosions and Critical Temperatures
Critical temperatures and concentration parameters for some common
substances as coal, zinc, uranium and more
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There are some basic rules to observe to see whether a dust is capable
of causing a dust explosion:
·
The
dust must be combustible
·
The
dust must be airborne
·
The
dust must have a size distribution capable of flame propagation
·
The
dust concentration must be within the explosive concentration range
·
An
ignition source with high enough temperature must be present
·
The
atmosphere must contain sufficient oxygen to support and sustain combustion.
Critical temperatures and dust concentrations of some
common substances where the explosion dangers are acute can be found in the
table below.
|
Substance
|
Ignition Temperature
of Dust Cloud
(oC) |
Minimum Explosive
Concentration
(oz/ft3) |
Relative Explosion
Hazard
|
|
Aluminum
|
650
|
0.045
|
Severe
|
|
Al-Mg alloy
|
|
0.02
|
Severe
|
|
Chromium
|
|
0.23
|
Strong
|
|
Coal
|
610
|
0.055
|
Strong
|
|
Copper
|
900
|
|
Fire
|
|
Epoxy Resin
|
530
|
0.020
|
Severe
|
|
Iron
|
420
|
0.100
|
Strong
|
|
Magnesium
|
520
|
0.020
|
Severe
|
|
Silicon
|
|
0.11
|
Strong
|
|
Tin
|
630
|
0.190
|
Moderate
|
|
Titanium
|
460
|
0.045
|
Severe
|
|
Uranium
|
20
|
0.060
|
Severe
|
|
Zinc
|
600
|
0.480
|
Moderate
|
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