Page 537 - Dust Explosions in the Process Industries

504 Dust Explosions in the Process Industries

7.8.2.4
Further Comparison of Test Methods
Hensel(l984) compared the minimum ignition temperatures for a range of dusts, using
four different apparatuses:the original and a modified BAM furnace and the original and
a modified Godbert-Greenwald furnace. The BAM furnace was modified by replacing
the rubber bulb for manual dust dispersion with an automatic system, as used with the
Godbert-Greenwald furnace. The Godbert-Greenwald furnace was modified by dou-
bling its length, which increased the residence time of the dust in the furnace. The results
are given in Table 7.1.

Table 7.1 Comparison of minimum ignition temperatures of dust clouds in air determined in four
different test furnaces

perature of a dust cloud

Source: Hensel, 1984.

With the exception of powders 7, 8, and 16 in Table 7.1, the long version of the
Godbert-Greenwald furnace gave the same values as or lower values than the standard
version. However, the differences were mostly moderate and no more than 50°C. The
modification of the BAM furnace also led to a slight reduction of the minimum ignition
temperatures.