Design requirements of plate frame Filter Press (1) the filtration pressure is 0.4~0.6MPa (about 4~6kg/cm2). (2) the filtration cycle is not more than 4H; (3) each filter can be equipped with a sludge pressure pump, and the pump should be plunger type. (4) the compressed air volume is not less than 2m3/min per 1m3 filter chamber (according to the standard working condition). (5) attention should be paid to good ventilation, high pressure flushing system, setting of sludge grinder before filtration, filtration of mud cake crusher and so on. The design method of pressure filtration dehydration is mainly based on the amount of sludge treatment, the concentration of dehydrated sludge, the working procedure of filter press and pressure filtration pressure to calculate the yield of mud cake, the area of the filter press needed and the number of tables.  Calculation and selection The dewatering area of plate and frame filter press is calculated according to the following formula:  A - pressure filter dehydration area, m2; QS - the amount of sludge per dewatering (mud volume), m3; Q - dehydration load, m3/ (m2. H); T - dehydration time, H. According to the calculated dewatering and dewatering area A, the selection of plate and frame filter press is carried out. At least 2~3 station is selected, and a full set of equipment is arranged in the dehydrating workshop.
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