As a kind of drying machine, the coal slime dryer or sludge dryer is more and more popular in these days. As an importance part for coal slime dryer, the bag filter is good at collecting dust and poisonous gas. When using the bag filter, we should pay much attention to the preventive measures for combustion and explosion. During the dealing process for hot air, matters like unburnt dust, flake, flammable gas are easy to enter into the bag filter. While, most of materials for filtering dust are flammable and easy to generate electrostatic. Under these circumstances, the chance to have fire or explosion disaster is much higher. Therefore, a series of preventive measures should be well prepared.

We should install a combustion room or flake collector in front of bag filter, thus some unburnt gas or dust can be fully collected. With regard to preventive measures for electrostatic accumulation, we can earth every part of sludge dryer with conductive materials or add conductive fibers in filter materials. Besides, we should prevent the dust from piling up or accumulating for the fear of spontaneous explosion. When we enter into the bag house or pipe for checks or overhaul, necessary ventilation is needed for the fear of carbon monoxide intoxication.

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