Brattice drier

Fig. 44. Diagrammatic view of a German brattice drier for primary explosives with screening of the product [67],...

Brattice driers, incorporating a device for removing the dried material (Fig. 44) have been used in Germany. The moist material, spread in a thin layer over cloth stretched on wooden frames (1), is dried in warm air supplied via the ducting (2) at a rate of about 0.5 m/sec. Next to the frame on which the material is dried there is a tin funnel (3) with a built-in sieve in its base. This funnel is connected with the ventilating duct by a flexible tube. Each frame (7) contains about 1.2 kg of fulminate (dry substance). To dry a batch of fulminate at 65-70°C takes... 

The evaporative capacities in Table 37.3 are somewhat higher than the corresponding values given by Stewart [75] for fleece wool dryers, namely, 10-15 kg m 2 h" for belt (or brattice) dryers and 20-30 kg m h for suction-drum dryers. However, Stewart s figures probably relate to older dryers of lesser performance. The electrical power use for brattice dryers is less than that for units involving rotating drums, being about 250 kJ kg > (evaporation) for the band driers and 400 kJ kg- for the drum dryers. However, the latter is still only about 12% of the thermal load. 

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See also in sourсe #XX -- [ ]

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