Filter Press

About filter press dewatering filter is the use of a pump or compressed air, the solid, liquid slurry consisting of two phases, at a pressure difference, through the filter medium and achieve solid and liquid separation dehydration process. At present, domestic and foreign pressure filtration equipment used in coal preparation plant can be divided into two kinds of plate and frame filter presses and belt filter press. Coal filter press generally frame filter based. 1? Filter work? ???? Filter press dewatering is the use of a pump or compressed air, the solid, liquid slurry consisting of two phases, at a pressure difference, through the filter medium and achieve solid and liquid separation dehydration process. At present, domestic and foreign pressure filtration equipment used in coal preparation plant can be divided into two kinds of box-type filter presses and belt filter press. Coal filter press generally dominated chamber filter press. ??? Filter press for coal preparation plant Slime recovery, closed water circuit and have played an important role in environmental protection. Currently, the device has become an effective check slime water treatment equipment. 1.1? Filter work? ???? Filter works by using a pressure pump, coal slurry pressed into two adjacent sealed filter chamber filter plate formed so that a pressure difference on both sides of the cloth, thus solid-liquid separation. ? ???? Filter is generally part of the head plate, end plate, filter plate, hydraulic cylinders, the main beam, transmission and pull devices. Hydraulic cylinder piston driven head plate, so the pressing filter plate filter chamber is formed adjacent to the filter plate; coal slurry by a slurry pump into the filter chamber, the water is discharged through the discharge port through the cloth, solid pulverized coal in the filter chamber is formed cake. When the coal slurry filter chamber filled with high-pressure coal slurry pump continue to pressure filtration, solid-liquid separation in the filter chamber. ? 1.2? Filter workflow? ???? Filter structure is simple, reliable, adaptable, generally based on the following process work. ? ???? (1) pressing filter plate. Operation of the hydraulic system, so that moving the head transom board direction, the entire filter plates between the head board and the tail board compression. Thus, between adjacent filter plates constitute a hollow sealed filter chamber. ? ???? (2) pressure filtration process. Feed pump slurry transportation from feedholes transom to filter room, when the filter chamber filled with slurry, pressure filtration process begins, the slurry feed pump pressure by means of solid-liquid separation. ? ???? In the early pressure filtration, pulp in the filter cake thickness indoors little smaller cake resistance, dehydration speed, usually with the use of low head and large flow pumps. Cake thickness increases, resistance increases, pressure filtration rate decline, then use a small flow of high-lift pump. The time required for pressure filtration process, based on coal slurry filtration properties and process requirements to determine, when it reaches a predetermined pressure filtration time, stop feeding, pressure filtration process is complete. ????? (3) Release the filter plate. Hydraulic steering system, the head plate back to its original position. ?? (4) Plates discharge. Drive and pull the drive chain on the unit, have opened the filter plates, the filter cake by means of weight loss, the lower part of the conveyor away. ? ???? Completion of the four steps to complete a cycle of work pressure filter. Since the filter press filtration pressure, so dehydration was better than vacuum filter. Filter -? Works ?? hydraulic press mechanism consisting of filter hydraulic station, cylinder, piston, piston rod and piston rod and the stopper plate structures connected with the motor, pump, pressure relief valve (regulator pressure) valve, pressure gauge, fuel lines, tanks. ??? Hydraulic pressing machine pressed by hydraulic station for the high-pressure oil chamber cylinder and a piston element filled with fluid, when the pressure is greater than the frictional resistance of the compression plate running slowly pressing plate pressing Plates , when the pressing force reaches the set pressure relief valve (set by the pressure gauge display), filter plate, filter box (frame type) or filter plates (van) is pressed, the relief valve start unloading In this case, cut off electrical power, the pressing operation is completed, when you return, reversing valve, pressure oil into the cylinder rod chamber, when the oil pressure to overcome the frictional resistance of the compression plate, pressing plate starts to return. Auto insurance ??? hydraulic compression pressure, the pressing force is controlled by the electrical contacts, would gauge the upper and lower pointer setting pointer value process requirements, the pressing force reaches the gauge on when limit, the power is turned off, the pump stops supplying power, due to the hydraulic system leakage and leakage may occur causing the pressing force reduction, when the pointer down to the lower pressure gauge, power supply is turned on, the pump start oil pressure reaches the upper limit, power cut off, the pump stops fueling the cycle in order to achieve the filter material in the process to ensure that the effect of clamping force. ??? Filtering: the way out of the clear filtrate flow filtration and undercurrent filter. Ming-flow filtration, water nozzle mounted on the liquid hole beneath each filter plate and the filtrate was visually inside out from the water spout. Undercurrent filtered beneath each filter plate has a fluid passage hole, several pieces of the filter plate was one of the fluid passage Kong Liancheng, a fluid conduit from the hole beneath the thrust plate is connected to the discharge. ??? Wash: The cake needs washing, sometimes washing unidirectional and bidirectional flow washing, washing undercurrent washing unidirectional and bidirectional. Ming unidirectional flow wash is wash lotion into the hole from the thrust plate in order to enter, through the filter cloth and then through the filter cake, nonporous filter plate outflow, then there is a liquid water nozzle orifice is closed, None of the liquid water nozzle orifice is open. Two-way free flow wash is wash lotion parties from both sides of the thrust plate into the wells were washed twice, namely lotions start again from the other side of the wash wash, lotion exports with imports diagonal direction, so called two-way cross-washing. Undercurrent unidirectional flow wash is wash lotion into the hole from the thrust plate turn into the perforated plate, through the filter cloth and then through the filter cake, never well filter plate outflow. Bidirectional undercurrent washing is washed twice lotion lotion into the hole from two board-side stop on both sides, namely washing start washing the side, then the other side washing, export lotion diagonal direction, so called undercurrent two-way cross-washing.