Page 134 - Dust Explosions in the Process Industries

Dust Explosions:An Overview 107

2 20
0
w
W
v,
g 10
a
3 w

z
3
E -
$ 1
1 5 10 30 100 250 1000
VESSEL VOLUME lm3l
Figure 1.124 Guide for designing dust explosion suppression systems for vessels of various voiumes,
based on the Graviner suppressor system:
Pressure resistance of vessel: t1.0 bar(g)
Explos.ionof pressure detection level: SO. 1 bar(g)
Suppressant: NH,H, PO,
Driving gas pressure: 60 bar
St I means dusts that cause maximum rates of pressure rise in the standard closed 1 m3 IS0 vessel
of up to 200 bar/s (Ks, = 200 bar m/s). St2 means dusts that cause 200-300 bar/s (Ks,= 200-300 bar
m/s). (From Moore and Bartknecht, 1987).

HIGH RATE
DISCHARGE 0
SUPPRESSORS. BAG FILTER
M

SUPPRESSORS
PRESSURE '
DETECTORS HIGH RATE
I /DISCHARGE
SUPPRESSORS

-Y
ALL

Figure 1.I 25 Dust explosion protection ofa grinding plant consisting of a mill, a cyclone, and a bag
filter, using a comprehensive automatic explosion suppression system (From Moore et a/., 7 984).