JP3772598B2 - Filter press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a sludge squeezing and dewatering apparatus containing a large amount of minerals and fibers, and more particularly to an intermittent filter press that enables cake washing.
[0002]
[Prior art]
Conventionally, as an intermittent press dehydrator, a pair of filter cloths are arranged between the filter plates before and after forming the filtration chamber, and the stock solution is press-fitted between the filter cloths to dehydrate and release between the filter plates. There is a filter press for discharging the cake to the lower side of the filter plate, and it is known, for example, as described in Japanese Utility Model Publication No. 7-21204. In addition, donut-shaped filter plates and rotatable stirring plates are alternately arranged in the filtration chamber at narrow intervals, and the sludge pressed into the filtration chamber is moved by sewing the gap between the filtration plates. The rotary filter press in which the separated liquid is discharged from the water and the filtered and dehydrated cake is continuously taken out from the other end while performing the sweep filtration is also disclosed in, for example, JP-A-10-165721. well known.
[0003]
[Problems to be solved by the invention]
However, although the above conventional filter press can perform large-capacity processing and high-pressure squeezing and dehydration, it has a complicated structure for opening and closing a large number of parallel filter plates, and requires a large installation space. In addition, it is necessary to periodically replace the filter cloth, which is a consumable item, and a large amount of washing water is required to regenerate the clogged filter cloth. In addition, this conventional rotary filter press prevents the clogging of the filter plate by stirring the stock solution and continuously obtains the cake, but it is stirred because the stir plate is rotated at a relatively high speed. The organic matter became colloidal, and colloidal sludge might flow out from the filter plate together with the filtrate, and the moisture content of the cake was relatively high. The present invention has been made in view of the above-described conventional problems, and its purpose is to perform double-side filtration while moving the sludge press-fitted into the filtration chamber together with the filtration chamber, and to laminate the cake and sludge laminated on the filtration surface. An object of the present invention is to provide a pressing and dewatering device that collects a cake having a low water content by using the shear resistance generated on the contact surface as a filtering force.
[0004]
[Means for Solving the Problems]
The gist of the present invention is that a filter chamber is formed by two disk-shaped filter plates disposed on a rotatable drive shaft and an outer ring which is in sliding contact with the outer periphery of the filter plate, and a lower portion of the filter chamber. A check plate is fastened to the outer peripheral ring of the filter plate, the side edge of the check plate is brought close to the filter plate, and its tip is slid on the drive shaft, and the start side of the filtration chamber regulated by the check plate The sludge supply port and the cake outlet on the end side are opened, and an open / close valve is provided at the outlet.The sludge that is press-fitted into the filtration chamber moves the concentrated sludge while performing double-sided filtration, The sludge is dehydrated by slip resistance with the contact surface of the filter medium, and the pressure dehydration is performed while applying back pressure to the dehydrated cake by closing the on-off valve.
[0005]
And, the washing water pipe and the compressed air pipe are connected to the sludge supply pipe connected to the sludge supply port of the filtration chamber so that the cake can be washed and the blown cake of the washed cake can be fed. It is. In addition, the washing water supply pipe injection port disposed on the check plate is provided on the filter plate, and the filter plate is washed from the inside of the filtration chamber when necessary to regenerate the filtration surface. . The check plate on the outlet side has a side edge portion close to the filtration plate and a tip portion slid on the drive shaft protruding in a cutting edge shape to peel the cake from the wall surface of the filtration chamber. is there. Further, if the wall surface of the check plate on the outlet side is curved in a parabolic shape, the check plate does not serve as a resistance to discharging the pressed and dehydrated cake. In addition, the filter plate can be washed by disposing a cleaning tube at the starting end of the filtration chamber provided with the supply port so as to face the outer peripheral surface of the filter plate.
[0006]
And the said filter plate consists of a disk-shaped metal screen which has many fine holes, and the outer ring support frame which joined and integrated the grid | lattice-like rib which inserted this metal screen, and two disk-shaped filter plates Is connected to a boss-like inner ring support, and this inner ring support is fitted to a rotatable drive shaft, so that the filter medium can be easily attached and the strength is increased. In addition, if a metal screen is stretched on the inner ring support of the filter plate, the filtration area is increased. The on-off valve is composed of a damper fixed to the rotating shaft of the cake outlet, a rotating lever connected to the rotating shaft of the damper, and a cylinder pivotally attached to the rotating lever. It is possible to discharge the cake having a uniform moisture content from the outlet by adjusting the degree of opening of the damper from the outlet of the outer ring and applying pressure and back pressure for filtration. A plurality of filtration chambers arranged in parallel with the drive shaft, both ends of the drive shaft that pivotally supports the plurality of filtration chambers supported on the frame, and the drive shaft linked to the drive machine are connected in a parallel multi-chamber configuration. Thus, a large volume of sludge can be treated, and a double-sided filtration chamber can be utilized to reduce the occupied space.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus according to the present invention is configured as described above. When the sludge is press-fitted from the supply port while closing the opening / closing valve of the cake outlet and rotating the filtration chamber at a slow speed, the concentration zone near the supply port immediately after the press-fitting Then, the filtrate is separated from both sides of the filter plate mainly by press-fitting pressure, and the sludge is concentrated. The sludge is transferred to the dehydration zone as the filtration chamber rotates while being concentrated, and the sludge is dehydrated by the frictional resistance with the contact surface of the filter medium by the rotation of the filtration chamber, and a cake layer is gradually formed on the filtration surface of the filter plate. Eventually, the sludge loses its fluidity, and shear friction resistance is generated between the cake layer on the filtration surface and the relatively soft sludge at the center, thereby promoting dehydration. The cake transferred to the pressing zone is further dehydrated while applying back pressure to the cake from the outlet. When the dehydrated cake is filled in the filtration chamber, supply of the sludge to the filtration chamber is stopped, and while the filter plate is continuously rotated, a washing water pipe is connected to the sludge supply port of the filtration chamber, Washing water is injected into the cake, and the active ingredient contained in the cake or unnecessary ingredient is washed and separated. After washing the cake, the washing water pipe at the sludge supply port is switched, the compressed air pipe is connected, compressed air is blown into the washed dehydrated cake, and the cake is blown to discharge moisture. Next, if the on-off valve is opened, the cake can be discharged from the outlet by the frictional resistance with the contact surface of the filter medium due to the rotation of the filter plate. At the end of the discharge of the cake, the sludge adhering to the filter plate can be washed and cleaned from both sides to prepare for the resumption of operation.
[0008]
【Example】
The filter press according to the present invention will be described in detail with reference to the drawings. First, in FIG. 1, reference numeral 1 denotes a filter press, and a bearing 4 is fixed to a pedestal 3 supported on frames 2 and 2 on both sides. The drive shaft 5 supported by the shaft 4 is rotated by the drive device 6. In the lower part of the filter press 1, a supply port 8 connected to the sludge supply pipe 7 and a cake outlet 9 are provided. The structure of the filter press 1 will be described in detail with reference to FIGS. 2 and 3. An inner ring support 10 is fitted to the drive shaft 5, and two disk-shaped filter plates 11 are attached to the inner ring support 10. The inner peripheral edge of 11 is fixed. The filter plate 11 is rotated slowly with the drive shaft 5. An outer peripheral ring 12 is disposed on the peripheral portion of the filter plate 11, and a filtration chamber 13 is formed in the inside of the two filter plates 11 and 11 and the outer peripheral ring 12. A cover 14 that covers the filter plate 11 is provided on the peripheral surface of the filter plate 11, and an outer peripheral end of the cover 14 is fixed to the outer ring 12. An inner peripheral edge of the cover 14 is supported by the drive shaft 5 by the bearing 4, and a filtrate chamber 15 is formed in the outer peripheral portion of the filtration chamber 13. In addition, the back surface of the cover 14 is fixed to the gantry 3 so that the outer peripheral ring 12 does not rotate with the filter plate 11. Reference numeral 16 denotes a filtrate drain pipe.
[0009]
As shown in FIG. 2, a check plate 17 for dividing the filtration chamber 13 is provided between the sludge supply port 8 of the filtration chamber 13 and the cake outlet 9, and the filtration plate 11 is rotated ( The sludge supplied from the supply port 8 of the filtration chamber 13 is in the concentration zone A at the beginning of press-fitting, and is solid-liquid separated mainly by the press-fitting pressure. The concentrated sludge is in the dehydration zone B, and the filtration chamber 13 Of the filter medium and the shear friction resistance force between the cake layer on the filtration surface and the relatively soft sludge at the center, thereby promoting dehydration. The filtration chamber 13 is further rotated and transferred to the squeezing zone C in the vicinity of the cake outlet 9. As shown in FIG. 4, the sludge supply pipe 7 connected to the sludge supply port 8 is provided with an electromagnetic valve V1, which is branched from the sludge supply pipe 7 behind the electromagnetic valve V1 and is connected to the washing water pipe 18. A compressed air pipe 19 is connected. The washing water pipe 18 and the compressed air pipe 19 are provided with solenoid valves V2 and V3, and the solenoid valves V1, V2 and V3 are opened and closed to supply sludge to the filtration chamber 13 and included in the cake. The cake washing for separating the active ingredient or the unnecessary ingredient, and the feed blow for blowing moisture to the cake after the cake washing can be performed.
[0010]
Further, as shown in FIG. 4, the check plate 17 is provided with a cleaning water supply pipe 20 for clogging elimination facing the filter plate 11 from the inside of the filtration chamber 13, and jetting of the cleaning water supply pipe 20. High pressure water is jetted onto the filter plate 11 with the mouth 21 rotating. Further, as shown in FIGS. 3 and 4, a cleaning water supply pipe 22 is disposed at the start end of the filtration chamber 13 provided with the supply port 8 so as to face the outer peripheral surface of the filter plate 11. Pressure water is injected from the injection port 23 of the water supply pipe 22 so that the sludge adhering to the filter plate can be washed and cleaned from the outer surface, and the double-sided cleaning of the filter plate 11 can be performed. As shown in FIG. 5, the check plate 17 on the outlet 9 side has a side edge portion 17 a close to the filter plate 11 and a tip end portion 17 b slidably provided on the drive shaft 5 projecting into a cutting edge shape. The cake discharged from the filtration chamber 13 to the outlet 9 is peeled off from the filtration chamber 13. If the wall surface of the check plate 17 facing the outlet 9 of the filtration chamber 13 is curved parabolically as shown in FIGS. 2 and 4, the cake is guided in the rotational tangential direction of the filter plate 11. Thus, the check plate 17 does not serve as a resistance to discharge of the press-dehydrated cake.
[0011]
As shown in FIGS. 2 and 3, an opening / closing valve 24 is provided at the cake outlet 9 of the filtration chamber 13, and the opening / closing valve 24 is connected to a rotating shaft 25 that is pivotally supported at one end of the outlet 9. It comprises a damper 26, a rotating lever 27 connected to the rotating shaft 25 of the damper 26, and a cylinder 28 pivotally attached to the rotating lever 27. The piston 29 of the cylinder 28 is expanded and contracted to take out the cake. 9 is opened and closed, the piston 29 is extended, the damper 26 is rotated, the outlet 9 is closed, and the back pressure is applied to the squeezing zone C. First, the outlet 9 is closed, and while the stock solution is continuously supplied from the supply port 8 of the filtration chamber 13, the sludge is concentrated and squeezed and dehydrated, and then the supply of the stock solution is stopped and the outlet of the filtration chamber 13 is removed. 9 is released, and the cake is taken out while the filtration chamber 13 is continuously rotated.
[0012]
As shown in FIGS. 6 and 7, the filter plate 11 includes a donut-shaped metal screen 30 composed of a wedge wire 30a and a support rod 30b attached to the back surface, and a lattice-shaped rib 31a joined and integrated. The outer ring support frame 31 is fitted so that the filter medium can be easily exchanged. In addition, if the metal screen 32 is stretched also to the inner ring support body 10 to which the inner peripheral edge of the filtration chamber 13 is fixed, the filtration area is increased and the dewaterability of sludge is improved. A plurality of drainage channels 33 are formed so that the filtrate separated from the filtration chamber 13 can be drained into the filtrate chamber 15. The continuous squeezing and dehydrating apparatus shown in FIG. 8 is another embodiment in which a plurality of the above-mentioned filter presses are arranged in parallel, and the filtration plate 11 forming each filtration chamber 13 is connected to the drive shaft 5a to form a multi-chamber configuration. is there. Further, the front and rear filtration chambers 13 are connected by a support cylinder 34, the support cylinders 34a and 34a at the front end and the rear end are supported by the frames 2a and 2a, and a pulley 35 fitted to the drive shaft 5a is attached to the drive machine 6a. A plurality of filter plates are rotated in conjunction with each other. Reference numeral 15a denotes a filtrate chamber for separating the filtrate from the filter plate 11. As described above, the parallel multi-chamber configuration enables large-capacity treatment of sludge and reduces the occupied space.
[0013]
【The invention's effect】
As is clear from the above description, the filter press according to the present invention performs double-sided filtration on the sludge press-fitted into the filtration chamber while slowly feeding the two sludge plates and sludge together. Between the cake and the relatively soft sludge at the center of the cake laminated on the filtration surface, and the sludge is concentrated and dehydrated. That is, the conventional filter press requires a complicated filter plate opening / closing device and a wide installation space. In the rotary filter press, colloidal sludge is generated from the filter plate in order to rotate the stirring plate at a high speed. In this invention, the filter plate and sludge generate frictional resistance and dehydrated cake, and the filter chamber is continuously rotated while the filter chamber is rotated. Since high-pressure water and compressed air are supplied, the components contained in the cake are separated, and the water in the washed cake can be separated. And since the washing water piping of the filter plate was provided in the check plate and the sludge supply side of the filter chamber, the filter plate can be regenerated.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a filter press according to the present invention.
FIG. 2 is a schematic longitudinal sectional front view showing the structure of a filtration chamber according to the present invention.
3 is a longitudinal side view of the filtration chamber according to the present invention cut along the line AA in FIG. 1. FIG.
FIG. 4 is a conceptual diagram showing piping for supplying pressure water and compressed air to the filtration chamber according to the present invention.
FIG. 5 is a front view of the check plate as viewed from the squeezing zone of the filtration chamber.
FIG. 6 is a plan view of a wedge wire screen.
FIG. 7 is a front view of a filter plate in which a wedge wire screen is fitted into a support frame.
FIG. 8 is a longitudinal side view of a filter press having a filtration chamber according to the present invention in a parallel multi-chamber configuration.
[Explanation of symbols]
2a Frame 5, 5a Drive shaft 6, 6a Drive 7 Sludge supply pipe 8 Supply port 9 Outlet 10 Inner ring support 11 Filter plate 12 Outer ring 13 Filtration chamber 17 Check plate 17a Side edge 17b Tip 18 Washing water pipe 19 Compressed air pipe 20 Washing water supply pipe 21 Injection port 22 Washing water supply pipe 21 Injection port 24 Opening and closing valve 25 Rotating shaft 26 Damper 27 Rotating lever 28 Cylinders 30 and 32 Metal screen 31 Outer ring support frame 31a Rib

Claims (11)

A filtration chamber (12) having two disc-shaped filter plates (11, 11) disposed on a rotatable drive shaft (5) and an outer ring (12) slidably contacted with the outer periphery of the filter plate (11). 13), a check plate (17) is fastened to the outer peripheral ring (12) at the lower part of the filtration chamber (13), and the side edge (17a) of the check plate (17) is attached to the filter plate. (11), the tip (17b) is slid on the drive shaft (5), and the sludge supply port (8) on the start end side of the filtration chamber (13) regulated by the check plate (17) The filter press is characterized in that a cake outlet (9) is opened to the outer ring (12) on the end side, and an open / close valve (24) is provided at the outlet (9). 2. The filter press according to claim 1, wherein a washing water pipe (18) is connected to a sludge supply pipe (7) connected to a sludge supply port (8) of the filtration chamber (13). The filter press according to claim 1 or 2, wherein a compressed air pipe (19) is connected to a sludge supply pipe (7) connected to a sludge supply port (8) of the filtration chamber (13). . The filter press according to claim 1 or 3, wherein an injection port (21 ...) of a washing water supply pipe (20 ...) disposed on the check plate (17) is provided on the filter plate (11). . The check plate (17) on the outlet (9) side has a side edge (17a) close to the filter plate (11) and a tip (17b) slid on the drive shaft (5). 5. The filter press according to claim 1, wherein the filter press is projected in a blade shape. 6. The filter press according to claim 1, wherein a wall surface of the check plate (17) on the outlet (9) side is curved in a parabolic shape. The washing water supply pipe (22) is arranged at the starting end of the filtration chamber (13) provided with the supply port (8) so as to face the outer peripheral surface of the filter plate (11). The filter press of thru | or 6. The filter plate (11) includes a disc-shaped metal screen (30) having a large number of fine holes and an outer ring support frame in which lattice-shaped ribs (31a) fitted with the metal screen (30) are joined and integrated. 31) and two disk-shaped filter plates (11) are connected to a boss-shaped inner ring support (10), and the inner ring support (10) is connected to a rotatable drive shaft (5). 8. The filter press according to claim 1, wherein the filter press is fitted. 9. The filter press according to claim 1, wherein a metal screen (32) is stretched on the inner ring support (10) of the filter plate (11). The on-off valve (24) includes a damper (26) fixed to the rotating shaft (25) of the cake outlet (9) and a rotating lever (25) connected to the rotating shaft (25) of the damper (26). The filter press according to any one of claims 1 to 9, wherein the filter press comprises a cylinder (28) pivotally attached to the rotation lever (27). A plurality of the filtration chambers (13) are arranged in parallel to the drive shaft (5a), and both ends of the drive shaft (5a) that pivotally supports the filtration chamber (13 ...) are supported on the frame (2a, 2a). 11. The filter press according to claim 1, wherein (5a) is interlocked and connected to a driving machine (6a).

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