Dust explosion problems in drying + granulation
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Our company used flash drying followed by granulation in the past; the material after drying was in powder form. However, the presence of oxygen made it easy for dust explosions to occur. We now want to use fluidized bed drying with nitrogen circulation, but there is still a risk of dust explosions due to the presence of air during the subsequent granulation process. Has anyone encountered such problems before? How to isolate the air during the drying + granulation process in order to prevent dust explosions caused by that air?
Using a nitrogen-circulated fluidized bed for drying can reduce the risk of dust explosions, but high oxygen levels in the nitrogen at key points in the system are required; therefore, the oxygen content must be monitored in real time based on the limiting oxygen concentration for granulated dust.
Is it possible to design a dust collector in the granulation stage?