Page 75 - Dust Explosions in the Process Industries

48 Dust Explosions in the Process Industries

A
STARCH (BARTKNECHT) /
AND POLYMER POWDER
(WALTHER AND SCHACKE) /

BROWN COAL
(WIEMANN)

BENZOIC ACID
(WALTHER AND SCHACKE

+ A 0 1 m3-vessel
o 20 L-sphere
@-
8
I I I I I
0 1 2 3 4 5
INITIAL AIR PRESSURE [bar (abs.11

Figure 1.53 The maximum explosion pressure at a constant volume as a function of initial air pres-
sure (Data from Bartknecht, 1978; Walther and Schake, 1986; and Wiemann, 1987).

an 1 c = 7000 g/m?~’

mm ,e c = 6000 g/m3
0-

800
- /
YI
LL 600 -
02
Y--
Zm
$ 400 -
Figure 1.54 The influence of initial pressure on
maximum pressure and maximum rate of pressure
rise in explosions of clouds of subbituminous coal
I I I dust in air in a 15 liter closed bomb: median par-