Page 379 - Dust Explosions in the Process Industries

348 Dust Explosions in the Process Industries

Table 4.14 lgnitability and explosibility properties of dusts used to determine MESG for dust
clouds in air

*Wettable sulfur = 80% sulfur + 20% lignum sulphate.
M = Median particle diameter by mass.
P,, = Maximum explosion pressure according to International Standards Organization (1 985).
Kst = Normalized maximum rate of pressure rise according to International Standards Organization (1 985).
MIE = Minimum net electric spark energy for ignition of dust cloud with 1 mH inductance in capacitive
discharge circuit.
Ti = Minimum ignition temperature of dust cloud determined in BAM furnace (see Chapter 7).
Source: Schuber, 1988, 1989.

Figure 4.56 Visible flame jets of maize starch/air transmitting from the primary to the secondary
dust cloud: (a) flame jet is too weak to ignite secondary cloud, (b) flame jet will ignite secondary
cloud (From Schuber, 1989).