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The mechanical separation principle is adopted for the tubular automatic backwash filter. The imported Johnson tube (Trislot company, Belgium) is used to separate the impurities in the raw materials. The filter is composed of multiple columns and multiple groups of parallel filtering units.
The normal process is from the outside to the inside, and the backwashing is from the inside to the outside. When the raw material passes through the filter container with filter element, the particles gradually deposit and gather on the outer surface area of filter element to form filter cake. With the increase of filter cake thickness, the liquid flow is more and more difficult to penetrate the filter element, and the pressure difference increases. When the pressure difference or operation time reaches the preset value, first close the raw material inlet valve of the group, then quickly open the backwash valve, use the filtered clean filtrate from the top to the bottom of the filter to form a pressure flow, remove the filter cake on the filter element surface, and remove all the removed filter cakes Discharge the blowdown line. After all other groups of the train are backwashed once, close the blowdown valve, resume the normal filtration process, and then backwash the other trains in turn.
Performance features: