Candle type filter in a sealed container in a combination of porous filter, filter cloth in the filter jacket (or other media), the filter used to pump the slurry into the filter, the slurry liquid passes through the filter medium into the porous filter liquid outlet center gathered, in the candle filter without filter the cake before the discharge of the "liquid" back to raw materials imported pulp to filter for filtration, cake formation (until the candle filter can achieve the filtering requirements), provide a signal to control the liquid liquid through a three-way valve no longer cycle, sent to the next process, the normal filter. Normal filtration after a period of time, when the porous wick cake reaches a certain thickness, providing a feed control signal (stop), and then discharge the residual liquid in the filter net, drain back blow control signal (to provide compressed air, nitrogen or saturated steam) reverse blowing, make the cake off blow back after a certain time, stop the blowback, provides a signal to open the discharging port of the filter slag, slag after the closure of the discharging port, to return to the initial state before filtration, to prepare for the next round of filtering.
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