KR101906987B1 - Apparatus and method for detaching cake in filter press - Google Patents

Abstract

Disclosed is a device for separating a cake of a filter press, which separates a solid type cake formed as a slurry containing moisture is dehydrated, from a filter press. The device for separating the cake of a filter press includes: multiple filter plates capable of moving in a direction in which the multiple filter plates are attached and in an opposite direction, wherein the multiple filter plates are arranged in a row; a filter cloth covering the front and rear surfaces of each of the multiple filter plates; and a high-pressure air supply unit supplying high pressure air to the multiple filter plates. The multiple filter plates include: an air inflow through hole formed by being penetrated in a thickness direction for the high-pressure air supplied from the high-pressure air supply unit to flow into each of the multiple filter plates; and an air discharge flow path extended by being branched from the air inflow through hole and having an opening discharging the high-pressure air flowing into the air inflow through hole to the filter cloth on the front and rear surfaces of the filter plate. The cake is attached to the filter cloth. The cake attached to the filter cloth is separated from the filter cloth by the high-pressure air discharged to the cake by passing through the filter cloth.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cake separating apparatus for a filter press,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a filter press, and more particularly, to a device and a method for separating a cake of a filter press for separating a solid cake from a filter cloth.

Since the slurry generated in various industrial sites as well as the sewage treatment plant contains a lot of water and is difficult to treat as it is, it is dehydrated into a so-called cake state and treated appropriately. As an example of a dewatering device for dewatering the above-mentioned water-containing slurry, there is a filter press. The filter press is a device configured to separate a solid and a liquid by injecting a slurry at a high pressure between a plurality of filter plates on which filter cloths are mounted. The liquid filtrate is drained through a drain pipe arranged at the corner of the filter plate during the compression process, and the solid cake remains between the filter plates.

The solid cake remaining between the filter plates is separated from the filter cloth by the self-weight when the filter plate is opened after the dehydration has sufficiently proceeded. However, since the specific gravity of the cake is small or the viscosity is high, it often occurs that the cake does not fall off and stick to the filter cloth. Therefore, as disclosed in Korean Patent Publication No. 10-1598652, the filter press may be configured to stimulate a plurality of filter plates to vibrate to separate the cake. However, the manufacturing cost of the filter press rises and the reliability of the operation may be lowered due to the complicated structure. In addition, even when the filter plate is vibrated, the cake is not cleanly separated from the filter cloth in many cases. Therefore, the worker tends to peel off the cake manually, resulting in a delay in the work, a decrease in work productivity, There is a problem of rising.

Korean Patent Registration No. 10-1598652

The present invention provides an apparatus and a method for separating a cake of a filter press in which high pressure air is blown into a cake adhered to a filter cloth in a state in which a plurality of filter plates are pressed, thereby separating the cake from the filter cloth.

The present invention relates to a device for peeling a solid cake formed by dewatering a slurry containing moisture from a filter press and comprising a plurality of devices arranged in a line and movable in the direction of close contact with each other, And a high-pressure air supply unit for supplying high-pressure air to the plurality of filter plates, wherein each of the plurality of filter plates has a filter plate, a plurality of filter plates, a filter cloth covering a front surface and a back surface of each of the plurality of filter plates, Pressure air supplied from the high-pressure air supply unit to the inside of the plurality of filter plates, and an air inflow through-hole formed in the air inflow through-hole so as to extend from the air inflow through- And an air discharge flow path in which an opening for discharging high-pressure air introduced into the air inflow through holes into the filter cloths on the front and back surfaces of the respective filter plates is formed, Wherein the cake adheres to the filter cloth and the cake adhered to the filter cloth is separated from the filter cloth by the high pressure air discharged through the filter cloth and discharged to the cake.

The plurality of filter plates each include a slurry inlet hole formed in a thickness direction so as to allow the slurry containing the moisture to flow therethrough and a slurry inlet hole formed in the slurry inlet hole so as to drain the dehydrated filtrate from the slurry when the plurality of filter plates are in close contact with each other. And may further include a drain hole penetrated through in the thickness direction.

Pressure air is discharged to the filter cloth in a state in which the flow of fluid through the drainage through-hole is closed, and the high-pressure air discharged into the filter cloth passes through the slurry inflow hole to the outside of the plurality of filter plates (Exhaust).

Wherein the air inlet hole is disposed above the drain hole and the plurality of filter plates are in close contact with each other so that the high pressure air does not flow into the air inlet hole, When the slurry flows in, the filtrate can be drained through the drainage through-hole as well as through the air discharge passage and the air inlet hole connected to the air discharge passage.

Wherein each of the plurality of filter plates has a pair of air inflow through holes divided into a first air inflow through hole and a second air inflow through hole, and the odd- Wherein the filter plate disposed at an even number among the plurality of filter plates has only an air discharge flow path branched and extended from the second air inflow through hole, The high-pressure air supply unit alternately supplies the high-pressure air to the first air inflow through-hole and the second air inflow through-hole.

The first air inflow through-hole is provided at a corner of one of the left and right corners of the upper end of the filter plate, and the second air inflow through-hole is provided at a corner of the other one of right and left corners of the upper end of the filter plate A pair of drainage through holes may be provided, and the pair of drainage through holes may be provided at left and right corners of the lower end of the filter plate.

The high-pressure air supply unit includes an air pump that boosts air to a high pressure and blows air, and a rotary valve that periodically blocks the flow of air that is boosted by the air pump , The air pressure of the high-pressure air discharged to the filter cloth through the opening of the air discharge passage may be periodically changed.

Further, the present invention is a method for peeling a solid cake formed by dewatering a slurry containing water using a cake peeling apparatus of the filter press in a filter press,

A filter plate adhering step of adhering the plurality of filter plates to each other; a step of putting a slurry containing moisture through the slurry inflow through holes into the plurality of filter plates in a state in which the plurality of filter plates are in close contact with each other, A slurry inlet and a primary dewatering step for forming a cake adhered to the filter cloth, high pressure air is blown into the slurry inlet holes to discharge the slurry remaining in the slurry inlet holes to the outside of the plurality of filter plates, A high-pressure air discharging step of discharging high-pressure air to the filter cloth by operating the high-pressure air supply unit to separate the cake from the filter cloth; and a high-pressure air discharging step of discharging high- A filter press having a filter plate opening step for separating the filter plates from each other Provide a cake peeling method.

Wherein at least a part of the filter plates of the plurality of filter plates further include a membrane expanded inside the filter plate in front of and behind the filter plate, and the method of peeling the cake of the filter press comprises: And a second dehydrating step of further dehydrating the slurry by expanding the membrane between the remaining slurry collection steps to narrow the space between adjacent filter plates.

The cake peeling apparatus of the filter press according to the present invention separates the cake adhered to the filter cloth from the filter cloth by discharging high-pressure air to the filter cloth, and separates the plurality of filter plates, that is, separates the cake from the filter cloth. Therefore, since the operator does not have to remove the cake, work delay is not generated, work productivity is improved, and labor costs are reduced due to labor cost reduction.

In addition, since it is not necessary to provide a structure similar to a vibrator for stimulating the cake to fall apart, the manufacturing cost of the filter press is reduced and the structure is simpler than that in the case of having a vibrator, thereby improving the reliability of operation and reducing the error occurrence rate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a cake peeling apparatus for a filter press according to an embodiment of the present invention, in which a filter cloth is omitted.
FIGS. 2, 3, and 4 are cross-sectional views cut along the lines AA, BB, and CC in FIG. 1, showing a state in which a plurality of filter plates are pressed together.
Fig. 5 is a front view showing the first filter plate of Fig. 1; Fig.
FIG. 6 is a front view showing the second filter plate of FIG. 1; FIG.

Hereinafter, a cake peeling apparatus and a cake peeling method of a filter press according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

FIG. 1 is a view showing a configuration of a cake peeling apparatus for a filter press according to an embodiment of the present invention, in which a filter cloth is omitted, and FIGS. 2, 3 and 4 are cross- Fig. 5 is a front view showing the first filter plate of Fig. 1, and Fig. 6 is a front view showing the second filter plate of Fig. 1. Fig. Referring to FIGS. 1 to 6, the filter press 10 according to the embodiment of the present invention is a device for forming a solid cake by squeezing and dewatering a slurry containing moisture, wherein a plurality of filter plates 40 , 60, a filter cloth 59, 79, and a high-pressure air supply unit 11.

The plurality of filter plates 40 and 60 are arranged in a line parallel to the Y axis and are arranged in a direction in which the adjacent pair of filter plates 40 and 60 are in close contact with each other and in the opposite direction, And 60 are spaced apart from each other. In FIG. 1, the plurality of filter plates 40 and 60 are shown separated from each other. In FIGS. 2 to 4, the plurality of filter plates 40 and 60 are in close contact with each other. A filter plate 40F disposed first in a direction parallel to the Y-axis so as to move in a direction in which the plurality of filter plates 40 and 60 are in close contact with each other is supported by a fixed wall (not shown) The filter plate 40L finally disposed in the direction parallel to the Y axis can be pressed in parallel with the direction of the Y axis negative (-) by a pressure plate (not shown) connected to a hydraulic cylinder.

The filter plates 40 and 60 are rectangular plate members each having a predetermined size and shape and are provided with concave and convex patterns 44 and 64 on the front faces 41 and 61 and the back faces 42 and 62, Is formed. The concave and convex patterns 44 and 64 are not distributed in the upper, lower, left, and right peripheral portions of the front surfaces 41 and 61 and the rear surfaces 42 and 62, respectively. The thickness of the central portions of the front surfaces 41 and 61 and the rear surfaces 42 and 62 in which the concave and convex patterns 44 and 64 are distributed is thinner than the thickness of the upper, When the plurality of filter plates 40 and 60 are in close contact with each other, the upper, lower, left, and right peripheral portions of the adjacent pair of filter plates 40 and 60 are in close contact with each other. So that a space for forming a cake is provided. That is, in the slurry containing water, a solid cake formed by dewatering the filtrate remains in the cake forming space.

The filter cloths 59 and 79 are filters in the form of cloths that do not pass through the liquid, that is, the filtrate and the solid through the slurry containing the water, 61 and the back surfaces 42, 62 and is supported by the filter plates 40, 60.

Among the plurality of filter plates 40 and 60, the even filter plate 60 is provided with a membrane 77 inside the concavo-convex pattern 64 as a so-called 'membrane plate' do. The odd-numbered filter plate 40 does not have the membrane 77 as a so-called " recess plate ". When a pressure source (not shown) is supplied and expanded to the inside of the membrane plate 60 in a state where the plurality of filter plates 40 and 60 are in close contact with each other, the membrane 77 of the front surface 61 and the back surface 62 The front surface 61 and the back surface 62 of the membrane plate 60 are bulged while being expanded forward and backward by the pressure. As a result, the cake forming space is narrowed and the cake filled in the cake forming space is further compressed to form a cake having a lower water content.

In the embodiment shown in the figure, the odd-numbered filter plates 40 are the recess plates and the even-numbered filter plates 60 are the membrane plates, and the first and last filter plates 40F and 40L are described as recess plates , This arrangement is exemplary and the filter press of the present invention is not limited to this arrangement. For example, the odd-numbered filter plates may be membrane plates and the even-numbered filter plates may be recessed plates, or all the filter plates of the filter press may be recessed plates or membrane plates.

Each of the plurality of filter plates 40 and 60 includes slurry inlet holes 45 and 65, drain holes 46, 47, 66 and 67, drain channels 51 and 53, 71 and 73, Holes 48, 49, 68, 69, and air discharge passages 55, 75, respectively. The slurry inlet holes 45 and 65 are formed by penetrating the filter plates 40 and 60 in the thickness direction so that a slurry containing moisture flows into the plurality of filter plates 40 and 60. The slurry inlet holes 45 and 65 are formed at the center of each filter plate 40 and 60 so as to be aligned along a virtual straight line parallel to the Y axis.

A center pipe 20 is connected to the slurry inflow through hole 45 of the first filter plate 40F and a slurry supply pipe 23 and a slurry return pipe 21 are connected in parallel do. The ends of the slurry return pipe 21 and the slurry feed pipe 23 are connected to a slurry tank (not shown) in which a slurry containing moisture is stored, and a vent is provided at an upper end of the slurry tank. A slurry supply pump for supplying the slurry to the plurality of filter plates 40 and 60 through the center pipe 20 is provided on the slurry supply pipe 23. The fluid flowing along the slurry return pipe 21 and the slurry feed pipe 23 is controlled by the flow control valves 22 and 24, respectively.

The valve 24 of the slurry supply pipe 23 is opened and the valve 22 of the slurry recovery pipe 21 is closed and the slurry supply pump 23 is closed, The slurry flows into the first filter plate 40F through the slurry feed pipe 23 and is filled into the cake forming space through the slurry inlet holes 45 and 65. [ The slurry to be filled in the cake forming space is dehydrated by the filter cloths 59 and 79 to become a solid cake. The valve 24 of the slurry supply pipe 23 is closed, and in addition, the membrane 77 expands, and dehydration can be further promoted.

Nevertheless, a slurry which has not been sufficiently dehydrated in the cake-forming space may remain, in particular, a slurry which is not sufficiently dehydrated on the imaginary straight line in which the slurry inflow through-holes 45, 65 are arranged may remain . The valve 22 of the slurry recovery pipe 21 is opened and the valve 24 of the slurry supply pipe 23 is closed and the first filter plate 40L is moved from the slurry inflow through- High-pressure air is blown in a direction parallel to the direction toward the slurry inflow through-hole 45 of the filter plate 40F, that is, the negative direction of the Y axis (-). The slurry having insufficient dewatering is discharged to the outside of the plurality of filter plates 40 and 60 through the slurry inflow through hole 45 of the first filter plate 40F so that the center pipe 20 and the slurry return pipe 21 And an exhaust flow path capable of fluid flow along the slurry inflow through-hole 45 is formed in the plurality of filter plates 40 and 60. The slurry inflow through-

The drain holes 46, 47, 66 and 67 are formed so that the filter plates 40 and 60 are moved in the thickness direction so that the filtrate drained from the slurry is drained when the filter plates 40 and 60 are in close contact with each other. . Each of the filter plates 40 and 60 is provided with a pair of drainage through holes 46, 47, 66 and 67, and the pair of drainage through holes 46, 47, 66 and 67 are provided with filter plates 40 and 60 ) At the left and right corners of the lower end. The drainage through holes 46 and 66 provided at the lower left corner and the drainage through holes 47 and 67 provided at the lower right corner are aligned along different imaginary straight lines parallel to the Y axis. 4, when the plurality of filter plates 40 and 60 are in close contact with each other, the water through holes 46 and 66 at the lower left corner and the water through holes 47 and 67 at the lower right corner are connected to each other A flow path through which the filtrate flows is formed.

The drainage passages 51, 53, 71 and 73 branch off from the respective drainage passages 46, 47, 66 and 67 and extend into the interior of the filter plates 40 and 60, 51, 53, 71 and 73 are formed with a plurality of openings 52, 54, 72 and 74 opened toward the front faces 41 and 61 and the rear faces 42 and 62, respectively.

The lower drain pipes 30 and 32 are connected to the drain holes 46 and 47 of the first filter plate 40F, respectively. Unillustrated ends of each of the lower drain pipes 30 and 32 are connected to a filtrate storage tank. The flow rates of the fluid flowing along the lower drain pipes (30, 32) are controlled by the flow control valves (31, 33), respectively.

The air inlet holes 48, 49, 68 and 69 are formed so that the high pressure air supplied from the high-pressure air unit 11 flows into the plurality of filter plates 40 and 60 through the filter plates 40 and 60 in the thickness direction As shown in FIG. Air inlet holes 48, 49, 68, and 69 are provided for each filter plate 40 and 60, respectively. The pair of air inflow through holes 48, 49, 68 and 69 are provided with first air inflow through holes 48 and 68 provided at the left corner of the upper end of the filter plates 40 and 60 and filter plates 40 and 60 And second air inflow through holes (49, 69) provided at the right corner of the upper end. The first air inflow through holes (48, 68) and the second air inflow through holes (49, 69) are formed to be aligned along different imaginary straight lines parallel to the Y axis. 3, when the plurality of filter plates 40 and 60 are in close contact with each other, the first air inflow through holes 48 and 68 and the second air inflow through holes 49 and 69 are connected to each other, A flow path through which air flows is formed.

The air discharge passages 55 and 75 are branched from the first air inflow through holes 48 and 68 and the second air inflow through holes 49 and 69 and extend into the interior of the filter plates 40 and 60, The discharge passages 55 and 75 are formed with a plurality of openings 56 and 76 opened toward the front faces 41 and 61 and the rear faces 42 and 62, respectively. The high pressure air introduced into the first air inflow through holes 48 and 68 and the second air inflow through holes 49 and 69 flows into the air discharge outflow passages 55 and 75 and the plurality of openings 56 and 76 To the filter cloths 59 and 79 covering the filter plate front faces 41 and 61 and the back faces 42 and 62, respectively. High pressure air discharged to the filter cloths 59 and 79 passes through the filter cloths 59 and 79 and is discharged to a cake (not shown) adhering to the filter cloths 59 and 79.

The odd-numbered filter plates 40 of the plurality of filter plates 40 and 60 include only the air discharge passage 55 branched from the first air inflow through-hole 48, But does not include an air discharge passage branched from the hole 49 and extending therefrom. Conversely, the filter plate 60 disposed at the even-numbered positions among the plurality of filter plates 40, 60 has only the air discharge passage 75 branched from the second air inflow through-hole 69, But does not include an air discharge passage branched from the inflow through-hole 68 and extending therefrom.

The first and second air inflow through holes 48 and 49 are disposed on the filter plates 40 and 60 above the drain through holes 46, 47, 66, and 67, respectively. When the slurry flows into the cake forming space formed inside the plurality of filter plates 40 and 60 through the slurry inflow through holes 45 and 65 in a state in which the plurality of filter plates 40 and 60 are in close contact with each other, The filtrate dehydrated in the slurry is drained through the drainage through holes 46, 47, 66, 67 arranged on the lower side. However, if the filtrate is discharged in a large amount from the slurry, the filtrate can be discharged through the drainage through holes 46, 47, 66, 67 as well as through the first and second air inflow holes 48, Can be drained.

The first and second air inflow through holes 48 and 49 of the first filter plate 40F are respectively connected to the upper drain pipes 48 and 49 so that the filtrate can be drained through the first and second air inflow through holes 48 and 49, 26, 28 are connected. The unillustrated ends of each of the upper drain pipes 26 and 28 are connected to the filtrate storage tank as in the case of the lower drain pipes 30 and 32. [ The flow rates of the fluid flowing along the upper drain pipes 26 and 28 are controlled by the flow control valves 27 and 29, respectively.

The high-pressure air supply unit 11 is a unit for supplying high-pressure air to the plurality of filter plates 40 and 60 and includes an air pump 12, a rotary valve 13, and an air supply line (15, 16, 18). The air pump 12 boosts the air to a high pressure and blows it out. The air supply lines 15, 16 and 18 are connected to the first and second air inflow through holes 48 and 49 of the finally disposed filter plate 40L, And a second air inflow through hole (48) and a second air inflow through hole (48) of the last filter plate (40L), branched from the end of the main line (15) And a first sub line 16 and a second sub line 18 which are connected to the first and second sub-lines 49 and 49, respectively. Since the last filter plate 40L moves in a direction parallel to the Y axis, the first sub line 16 and the second sub line 18 may be, for example, a flexible hose, The main line 15 may be a rigid pipe or a tube. The flow rates of the air supplied to the first air inflow through holes 48 and 68 and the second air inflow through holes 49 and 69 along the first sub line 16 and the second sub line 18 are respectively controlled by the flow rate control Is controlled by valves (17, 19).

When the slurry containing moisture is introduced into the plurality of filter plates 40 and 60 adhering to the surface of the filter plates 40 and 60, And the filter cloths 59 and 79 of the back surface 42 and 62, respectively. Pressure air is discharged to the filter cloths 59 and 79 through the openings 56 and 76 of the air discharge channels 55 and 75 and then adhered to the filter cloths 59 and 79 through the filter cloths 59 and 79, So that the cake is separated from the filter cloth 59, 79.

The rotary valve 13 is disposed on the main line 15 to periodically open and close the main line 15 to increase the pressure in the air pump 12 and supply the first and second air via the air supply lines 15, Thereby periodically shutting off the flow of air supplied to the air inflow through holes 48 and 49. The openings 56 and 55 of the air discharge passages 55 and 75 connected to the first and second air inflow through holes 48 and 69 of the plurality of filter plates 40 and 60 due to the operation of the rotary valve 13, The air pressure of the high-pressure air discharged to the filter cloths 59 and 79 is periodically changed. When there is no rotary valve 13, high pressure air of constant pressure is continuously discharged through the openings 56 and 76 of the air discharge passages 55 and 75. When there is the rotary valve 13, Air having a pressure pattern in the form of a sine wave is discharged through the openings (56, 76). Since the air pressure applied to the filter cloths 59 and 79 changes dynamically, the effect of imparting a physical vibration stimulus to the filter cloths 59 and 79 is added, and separation of the cake adhering to the filter cloths 59 and 79 is further promoted. On the other hand, the present invention is not limited to the cake peeling apparatus having the rotary valve (13), and is not included in the present invention without a rotary valve. Further, it is also possible to control the air pressure of the high-pressure air discharged periodically using a general flow control valve instead of the rotary valve.

Hereinafter, a method of separating a cake of a filter press from a filter press by using the cake peeling apparatus 10 of the filter press described above will be sequentially described. The method of peeling the cake of the filter press includes a step of adhering a filter plate, a slurry feeding and primary dehydrating step, a secondary dehydrating step, a remaining slurry recovering step, a high pressure air discharging step, and a filter plate opening step.

The step of adhering the filter plate is a step of bringing the plurality of filter plates (40, 60) into close contact with each other. The slurry injecting and primary dewatering step is a step of supplying a slurry containing moisture through slurry inflow through holes 45 and 65 to the plurality of filter plates 40 and 60 in a state in which a plurality of filter plates 40 and 60 are in close contact with each other, 60 to dehydrate the slurry to form a cake adhered to the filter cloths 59, 79. Specifically, the flow rate control valve 24 of the slurry supply pipe 23 is opened and the flow rate control valve 22 of the slurry return pipe 21 is closed to operate the slurry supply pump, The slurry is fed at high pressure. Then, the slurry flows through the slurry inlet holes 45 and 65 to fill the cake-forming space between the adjacent filter plates 40 and 60 with the slurry.

The flow control valves 27, 29, 31, 33 of the upper and lower drain pipes 26, 28, 30, 32 connected to the first filter plate 40F in the slurry supply and primary dehydration stages are opened, And the flow control valves 17, 19 of the second sub-lines 16, 18 are closed. The filtrate is dehydrated in the slurry filled in the cake forming space by the supply pressure of the slurry supply pump. The filtrate passes through the filter cloths 59 and 79 and flows along the grooved grooves of the concavo-convex patterns 44 and 64 formed on the filter plate front faces 41 and 61 and the back faces 42 and 62, 53, 71 and 73 through the drain holes 52, 54, 72 and 74 of the filter plates 40 and 60 and into the drain holes 46, 47, 66 and 67 at the lower ends of the filter plates 40 and 60, Is drained to the filtrate storage tank outside the plurality of filter plates (40, 60) through the lower drain pipes (30, 32).

As described above, when the amount of the filtrate is large, a part of the filtrate that has passed through the filter cloths 59 and 79 flows into the air discharge passages 55 and 75 through the plurality of openings 56 and 76, (48, 68) and the second air inflow through holes (49, 69) at the upper end of the filter plates (40, 60) through the upper water pipes To the filtrate storage tank outside the plurality of filter plates 40, 60.

The second dehydration step is a step of further diluting the slurry by causing the membrane 77 of the membrane plate to expand to narrow the cake forming space between the adjacent filter plates 40 and 60 . In other words, the membrane 77 of the membrane plate 60 is pressurized by a pressure source (not shown) to bulge the front surface 61 and the back surface 62 to further promote dehydration of the slurry. When the membrane 77 is restored to the original state from the expanded state, a solid cake is formed in the cake forming space. Further, in the cake-forming space, the filtrate may be dehydrated and some unfilled space may be formed.

The remaining slurry is recovered by blowing high-pressure air into the slurry inflow hole so that the remaining slurry remaining in the slurry inflow through-holes (45, 65) is not sufficiently dewatered in the cake formation space, (40, 60). As described above, a slurry which is not sufficiently dewatered may remain in an imaginary straight line in which the slurry inflow through holes 45 and 65 are arranged, particularly in the cake forming space. Therefore, as a specific example, the flow control valve 22 of the slurry recovery pipe 21 is opened and the flow control valve 24 of the slurry supply pipe 23 is closed, High-pressure air is blown in the direction from the hole 45 toward the slurry inflow through-hole 45 of the first filter plate 40F, that is, in the direction parallel to the direction of the Y axis negative (-). The slurry having insufficient dewatering is discharged to the outside of the plurality of filter plates 40 and 60 through the slurry inflow through hole 45 of the first filter plate 40F so that the center pipe 20 and the slurry return pipe 21 To the slurry tank. An exhaust flow path is formed in the plurality of filter plates (40, 60) along the slurry inflow through-hole (45) and capable of fluid flow extending parallel to the Y axis.

The high-pressure air discharging step is a step of discharging high-pressure air to the filter cloths 59 and 79 by operating the high-pressure air supply unit 11 to separate the cake from the filter cloths 59 and 79. Specifically, the flow control valves 27, 29, 31 and 33 of the upper and lower drain pipes 26, 28, 30 and 32 are closed, the flow control valve 24 of the slurry supply pipe 23 is closed, The flow control valve 22 of the slurry recovery pipe 21 is opened. When the air pump 12 is operated and the flow control valves 17 and 19 of the first and second sub lines 16 and 18 are alternately opened, Through the plurality of openings 56 of the air discharge passage 55 connected to the air inflow through holes 48 and the air discharge passage 75 connected to the second air inflow through holes 69 of the even filter plates 60 Through the plurality of openings 76 of the filter cloths 59 and 79, respectively. Accordingly, the cake adhering to the filter cloths 59 and 79 is separated from the filter cloths 59 and 79. However, the method of separating the cake of the present invention is not limited to supplying the high-pressure air alternately to the first and second sub lines 16 and 18, and it is also possible to provide the first and second sub lines 16 and 18 simultaneously It is also possible to supply high-pressure air.

The flow control valves 27, 29, 31 and 33 of the upper and lower drain pipes 26, 28, 30 and 32 are closed so that the drainage through holes 46, 47, 66 and 67 at the lower ends of the filter plates 40 and 60 And the flow of the fluid through the upper drain pipes 26 and 28 is also closed so that the high pressure air having passed through the filter cloths 59 and 79 passes the cake through the filter cloths 59 and 59, 79, and the filtrate is dewatered and unfilled in the cake-forming space, and in the remaining slurry collecting step, the slurry flowing through the slurry inflow hole 45 is extended in parallel with the Y-axis (Not shown) through the central pipe 20 and the slurry recovery pipe 21, and is discharged through the vent hole of the slurry tank to the outside .

At this time, if the rotary valve 13 is operated together with the air pump 12 as described above, the air pressure applied to the filter cloths 59 and 79 is applied along the pressure pattern of, for example, a pulse or sine wave pattern The effect of giving a physical vibration stimulus to the filter cloths 59 and 79 is added so that the separation of the sludge cake adhering to the filter cloths 59 and 79 is further promoted.

The filter plate opening step separates the plurality of filter plates 40 and 60 from each other such that the cake falls down by its own weight. When the filter plates 40 and 60 are opened, that is, when the plurality of filter plates 40 and 60 are separated from each other, the cake cleanly separated from the filter cloths 59 and 79 in the high- Falls down below the filter plates 40 and 60, and the cake is discharged from the filter press.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

10: Filter press 11: High pressure air supply unit
12: air pump 40,60: filter plate
45,65: slurry inlet hole 46,47,66,67: drain hole
48, 49, 68, 69: air inflow through holes 55, 75:
56,76: openings 59,79: filter cloth

Claims (9)

delete A plurality of filter plates arranged in a row and movable in a direction in which they are in close contact with each other and in a direction opposite thereto, and each having a slurry inflow through hole and a drain through hole; A filter cloth covering a front surface and a back surface of each of the plurality of filter plates; And a high-pressure air supply unit for supplying high-pressure air to the plurality of filter plates. In the filter press, a solid cake is formed by dewatering a slurry containing moisture through a filter cloth, As a method for peeling off a filter press,
A filter plate adhering step for adhering the plurality of filter plates to each other;
The slurry is introduced into the plurality of filter plates through the slurry inflow through-holes in a state in which the plurality of filter plates are in close contact with each other to dewater the slurry, thereby forming a cake adhering to the filter cloth ;
A remaining slurry collection step of blowing high-pressure air into the slurry inflow through-holes after the dewatering step to discharge the slurry remaining in the slurry inflow through-holes to the outside of the plurality of filter plates and recovering the remaining slurry;
Pressure air discharging step of operating the high-pressure air supply unit so as to discharge high-pressure air from the filter plate through the filter cloth while separating the cake from the filter cloth and exhausting the air through the slurry inflow through- ; And
And a filter plate releasing step of separating the plurality of filter plates from each other so that the cake falls downward due to its own weight after the high-pressure air discharging step. 3. The method of claim 2,
Pressure air is discharged to the filter cloth in a state in which the flow of the fluid through the drain hole is closed, and the high-pressure air discharged into the filter cloth flows through the slurry inflow through- And the plurality of filter plates are exhausted to the outside of the plurality of filter plates. delete 3. The method of claim 2,
Wherein each of the plurality of filter plates has a pair of air inflow through holes divided into a first air inflow through hole and a second air inflow through hole,
Wherein the odd-numbered filter plates of the plurality of filter plates include only air discharge channels branched and extended from the first air inlet through-holes, and filter plates arranged at odd- Only the air discharge flow path branched from the air inflow through hole is provided,
Wherein the high-pressure air is alternately supplied to the first air inflow through-hole and the second air inflow through-hole to supply high-pressure air. 6. The method of claim 5,
The first air inflow through-hole is provided at a corner of one of the left and right corners of the upper end of the filter plate, and the second air inflow through-hole is provided at a corner of the other one of right and left corners of the upper end of the filter plate And,
Wherein the pair of drainage through holes are provided at the left and right corners of the lower end of the filter plate. 3. The method of claim 2,
Wherein the air pressure of the high-pressure air discharged to the filter cloth through the opening of the air discharge passage is periodically changed in the high-pressure air discharging step. delete 3. The method of claim 2,
Wherein at least a part of the plurality of filter plates includes a membrane which is expanded inside the filter plate in front of and behind the filter plate,
The dewatering step further comprises the step of expanding the membrane between the remaining slurry collection steps after the slurry charging and the first dewatering step to narrow the space between adjacent filter plates to further dewater the slurry in a second order Wherein the filter press has a plurality of openings.

Images