JPS6082111A - Filter press - Google Patents

Abstract

PURPOSE:To separate efficiently solid particles in a slurry from a liquid, and to remove sufficiently the remaining liquid between the solid particles by providing a pressurized slurry supply means and a pressurized gas supply means in a filter press. CONSTITUTION:Both surfaces of a filter plate is recessed, and a slurry passage hole 26 communicating with both surfaces is provided. A filter cloth is laid over both surfaces, and the filter plates are supported freely detachably from each other by a supporting means. The filter plates are clamped together through the filter cloth by a clamping means. A slurry is pressurized by a pressurized slurry supply means, and supplied between the filter cloths laid over the filter plates. A means for pressurizing the gas and supplying the pressurized gas between one of the two filter cloths bounded by the filter plates and the filter plate adjacent to the filter cloth is provided. The cake is pressed by supplying the pressurized gas, and the gas is forced into the clearance between the solid particles in the filter cloth to replace the liquid between the solid particles and to extrude the liquid.

Description

[Detailed description of the invention]

The present invention relates to a filter press that efficiently separates solid particles from a liquid in a slurry and sufficiently removes residual liquid between the solid particles. To filter slurry with solid particles and turbidity, various filters such as vacuum filters, centrifuges, and filter presses (also called pressure filters) are used, or particles with relatively small diameter δ are used. For slurry in which the proportion of solid particles in the slurry is small, a large amount of solid particles can be efficiently separated by using a filter press that has a wide filtration area and can apply a large pressure. However, in order to remove as much liquid as possible from the cake, which is the separated solid particles, it is necessary to increase the supply pressure of the slurry.As a result, the filter press χ must be constructed to withstand this pressure. It is unavoidable that the costs will increase if necessary. In addition, the particle diameter of the solid particles in the slurry increases, and the amount of liquid remaining in the gaps increases. Therefore, this you na sura IJ
When performing Y-filtration, even if the slurry supply pressure is increased,
It is impossible to remove the liquid in the cake beyond a certain ratio. A filter press σ that overcomes the disadvantages of inventiveness σ)
) As mentioned above, the purpose of this improvement is to be able to efficiently process a large amount of slurry in a short period of time, even with a narrow particle size distribution in which the solid particle size is coarse or the particle size is uniform. The object of the present invention is to provide a filter press that can sufficiently remove the liquid in the cake. In the present invention, both surfaces of a large number of filter plates are formed in a concave shape, slurry passage holes communicating with the same surfaces are provided in each of the same filter plates, and filter cloths χ are respectively attached to both sides of each filter plate.
The plurality of filter plates are supported by a filter plate supporting means so as to be able to follow each other, and the plurality of filter plates are brought into pressure contact with each other by a means for tightening the filter plates through the filter cloth, and the plurality of filter plates are Since the slurry is pressurized and supplied by the pressurized slurry supply means between the filter cloths that are attached to each other, the slurry that is sandwiched between the filter cloths is supplied through each slurry passage hole of the filter plate. Slurry is supplied under pressure between each filter cloth, and the liquid in the slurry is separated from the solid particles by each filter cloth, passes through the filter cloth, and is discharged to the outside through the filter plate, and the liquid in the slurry is σ)
Only solid particles are collected between the filter cloths. In the invention, a gas is pressurized and supplied between any one of the two filter cloths sandwiched between the adjacent filter plates and a constant filter plate placed adjacent thereto. After the gas supply means is installed, the two filter cloths sandwiched between the adjacent filter plates are filled with solid particles to form a cake layer.
J [1 pressure gas supply means] is operated τ, the two filter cloths σ
) By supplying gas under pressure between either one of the two filter plates and the adjacent filter plate, pressure is applied to the cake in the two filter cloths to compress the cake, and the cake inside the filter cloth is compressed. The gas can be forced into the gaps between the solid particles to replace the liquid between the solid particles and eliminate the liquid. As a result, the liquid residual rate in the cake can be greatly reduced. . As described above, according to the invention, even a slurry of solid particles with coarse solid particles or uniform particle diameters and large gaps between particles can be separated from the same slurry or can be separated from the slurry by a mechanical method. The liquid can be removed sufficiently and easily. Moreover, the inventive feature is that there is no need to increase the slurry supply pressure by a large amount, so the strength and rigidity of each component can be reduced, and the production cost and operating cost can be reduced. Wastewater treatment W! An embodiment shown in FIGS. 1 to 10, which is applied to a device, will be described. 1 is a Shirafuna that receives the supply of coal cleaning wastewater, temporarily stores it, discharges it as clear water, and supplies the wastewater to the gravity separation tank 3. The constant waste water supplied to the tank is separated and concentrated in the same gravity separation tank 3, and then passed through a slurry supply pipe 9 interposed with a valve 5.6 and a pressurized slurry supply pump 8 to be supplied to the filter press 10. The discharge port of the near compressor 11 is also connected to the compressor press 10 via a pressurized air storage tank 12, an air supply pipe 13 and a valve 14. The filter press 10 has a structure as described below. 20 stands vertically on the floor at a constant distance σ], and a pair of left and right stands σ) are provided, and a support beam 21 is installed horizontally on the upper part of the stand. In addition, the support beam 21σ) upper I of the inner horizontal piece 22
ffIvc, a rail is laid, and a large number of filter plates 5 each having a side length of approximately 2rrL are movably suspended via the rail 23 + C filter plate hanging fittings 247, and at the right end of the filter plate 5. A movable plate 33 is movably suspended. Furthermore, the filter plate 25 is connected to the stand mark α on the opposite side of the movable plate 33, and four tension rods 31"Jiff are attached to each of the four corners of the movable plate 33
One end of the tension rod 4 is integrally connected to the movable plate 33, and the other end of the tension rod is integrally connected to a hydraulic cylinder (35σ) piston portion (not shown) for tightening the tension rod attached to the stand 20a. The same tightening is done by the operation of the hydraulic cylinder 35, and the moving plate 33 is tightened by the tension rod 3.
4Fa', the filter plate 5
are set to be mutually corrected. Furthermore, an open frame chain 36 is suspended within the support beam 21, and an open frame attachment 37 is attached to the chain I, and the open frame attachment 37 engages with the required filter plate hanging metal fitting. In this state, the frame-opening drive device 38 is operated and the frame-opening attachment 37 is moved to the right using the chain 7B6, so that the required filter stones can be opened one by one toward the movable plate 33. I am working hard to However, in the filter root 5, a slurry passage hole 26 with a diameter of about 20 cm is formed slightly below the center, and both surfaces 27 of the filter plate 5 are recessed entirely except for the outer periphery. The protrusions 48 are regularly protruded at predetermined intervals. There are two empty supply holes at the upper left and right corners of the filter plate 5.
28 h 7)' There are drain holes 3Q a and 3Q h in the two lower left and right corners of the same filter plate B, as well as the drain holes 3Q a and 3Q h.
Each of them has been penetrated. Roughly, the filter plate 25 has two types of filter plates 25-I and 25.
-n, both filter plates -■, 25-11 are mutually
In the filter plate 25-1, as shown in FIGS. 3 and 8, the air supply hole α on the left side is The τ communication hole 29α facing both surfaces 27-I of the filter plate 25-I is penetrated, and the communication hole 31b is also penetrated from the right drainage hole 30b to the both surfaces 27-■ of the same filter plate 25-1. ing. In addition, on the other filter plate 2511, as shown in FIGS. 4 and 9, the right σ) air supply hole 28
b,! : rl 1i1i Filter plate 25-IIσ) Both sides 27-H is penetrated with communication hole 29h, and drain hole Iα on the left side of 1 filter plate 25-IIσ) Both sides 2
7-II, and the communication hole 31 (Z is penetrated. The above-mentioned filter plates 25-1, 25-IIσ) and 27-
1. 27-II [is a coarse drainage net 39 is attached with a net stopper (not shown), and an opening formed slightly below the center is connected with a short cylindrical filter cloth 41 to form 1 and 2.
A set of filter cloths 40-I to 40-n is installed on both sides of each filter plate 27-1 in the installation order as shown in FIG. γ
The lower side edges of the filter cloths 40-I and 4O-It are connected to each other by a binding wire 45, and the filter cloths 5-1125 11) if
fl cloth 40 I - 4011 top fi 42 force integrated + C sliding a is exposed. μ Furthermore, two tension ropes 46 are strung across the top of the stand xa on both the left and right sides for 20h, and one end of the rope 46

[The row 146 is connected to the stand 20 (Z balancer (not shown)) and the guide sheave 32 is pivotally connected to both sides of the top of the filter plate 5. is supported, and both ends of the filter cloth suspension bar 43 around which the top edge 42 of the filter cloth 40 is wrapped are located between the guide sheaves 32 of the adjacent filter plates 5 via the suspension sheave 44. It is supported by the mouth-146 and is heated to ℃.
When the frame opening drive device 38Vc opens the filter plate 25 as shown in FIGS. 2 and 10, solids collected on the filter cloth hanging bar 43, the filter cloth 40, and the filter cloth 40 are removed. Due to the weight of the cake 47 (particles), the tensioning lobe 46 is drawn out, the filter cloth hanging bar 43 is lowered, the filter cloth 40 is spread out in an inverted V shape, and the cake 47 is peeled off from the filter cloth 40 and falls. It has become. '2 Lanima L stand addition α has the filter plate 25σ) and a slurry supply pipe 9σ at a position opposite to the slurry passage hole 26]
One end of the air supply pipe 13a513h is connected to one end of the air supply pipe 13a513h, and the air on-off valve 14a, 14b is interposed at a position opposite to the air supply hole 28a, 28h of the filter plate 5σ). Furthermore, filtrate volume closing valves 16g and 16h are respectively interposed at positions facing the drain holes 3Qa and 3Qb of the filter stone, and one end of the filtrate water discharge g15α and 15h is respectively followed. Since the embodiment shown in FIGS. 1 to 10 is constructed as described above, it achieves the following effects. To close the paper, operate the hydraulic cylinder 35 to remove the filter plate 25-
I, 25-n are strongly forced against each other, valves 5, 6 and filtrated water on/off valves 16α and 16b are opened, and valves 7 and 14 are opened.
In a steady state with blockage of
When K is supplied, the concentrated wastewater slurry is transferred to stand 20.
(Filtration adjacent to Z &25-Iσ) Through the slurry passage hole 26, τ filter plate 25-I and the filter plate 25-I adjacent to this
It flows between the two filter cloths 40-I and 4O-11 sandwiched between
- The flow flows between the two filter cloths 40-■ and 40-I sandwiched between the filter cloth 40-■ and the third filter plate 25-1 adjacent to the filter plate 25-1. It flows between the cloths 40-I and 4O-11, and is thus filled between all the filter cloths 40-I and 40-1. Then the water in the slurry was filtered using filter cloth 40-I%4O-II.
- Passes through the short cylindrical filter cloth 41 and passes through the drained liquid 39,
From the bottom space of the filter plates 25-i and 25-IJ, the communication hole 3
1α-31h ~ Drain hole 30α ~ 30h, filtered water discharge pipe 1
5α-15b and the filtrate amount closing valves 16α and 16h, the water is discharged to the outside of the filter press IO. Then, coal particles as solid particles in the slurry or filter cloth 40-
1, 4O-II and the short cylindrical filter cloth 41, and the filtration resistance increases as a cake layer is gradually formed on the filter cloth surface. If the supply pressure is gradually increased, slurry or filters I
OK, we will continue to supply it. The supply pressure of the slurry supply pump 8 is 15 to 25
kg/crl and almost no slurry can be transferred to the filter press IO, the valve 5.6 is closed and the operation of the pressurized slurry supply pump 8 is stopped. Compared to the wide filter cloths 40-1 and 4O-IIK, which are close to 47 fVc, the diameter of the short cylindrical filter cloth 41 is as small as about 20 cIn, so as mentioned above, most of the slurry is transferred to the filter cloth IO.
In a state where K supply is no longer possible, two filter cloths 40-I each
, 4 O-ri space may be filled with cake 47], but also cake 47 may form a light band within the short cylindrical filter cloth 41.
σ) -l of the cake 47 formed within the short cylindrical filter cloth 41
- When pressurized air is applied as described later, the pressurized air is prevented from short-circuiting through this slurry passage hole 26. After stopping the operation of the pressurized slurry supply pump 8σ]
Perform the operation described below to remove both sides 2 of the filter plate 25-I.
By supplying pressurized air between 7-■ and the filter cloth 40-1 adjacent thereto, once for a certain period of time or intermittently for several times.
Initially, the cake 47 formed soft between the filter cloths 40I-40-11 can be squeezed, and the moisture in the gaps between the solid particles in the cake 47 can be replaced with air and water. That is, the air conditioner 11 is operated in advance to store the pressurized air λ in the pressurized air storage tank 12, and the valves 5, 6, and τ are set at intervals of τ.
7, 14h, 16 (Z rabyt is closed and the air on/off valve +4
As shown in FIG.
After filling between both sides 27-1 of the filter cloth 40-1 and the adjacent filter cloth 40-2, the amount of filtrated water in the other drainage hole 30A [filtrated water discharge pipe 15 h connected to the closed valve 16 h] '& opened, and after a certain period of time, said both on-off valves 14 cL% 16 h
After closing the tube, repeat the above operation again as necessary. Then, the pressurized air between both sides 27-■ of the filter plate 25-1 and the filter cloth 40-1 that is adjacent to it acts entirely on the filter cloth 40-I, Not only is the cake 47 between -11 squeezed, but also the mouth filter cloth 40-I, 40
-■ Penetrates the inside of the space cake 47 over the entire surface and spreads on both sides 27-■ of every other filter plate 25-II,
Q cloth 40-]] is reached, and at this time, the moisture in the gaps between each solid particle in cake 47 is replaced by this permeated air. !
The draining net 39 is connected between the X cloth 40-■ and both sides 27-■ of the filter plate 25-II, and the communication hole 31h1 discharge port 30b
And the filtrate is discharged to the outside of the τ filter press 10 through the filtrate discharge pipe 15 h y, 6. In addition, while the pressurized air supply to the filter press IO is suspended, α) residual pore water in the cake 47 is generated in the cracks and air short-circuit passages generated in the cake 47 between the filter cloths 40α and 40h due to the above operation. Once the air enters, these cracks and air short-circuit passages will disappear, and when the pressurized air is supplied again, the filter cloth 40-
Air and water exchange in the cake 47 between I and 4O-II is performed smoothly. Furthermore, both sides 27- of -10,000 filter plates 25-I
From ■, filter cloth 40-I, cake 47, filter cloth 40-■7
After circulating the air to the image side 27-■ of the other filter plate 25-II through the filter plate 25-II, perform the operation described below to reverse the air flow ten thousand times and let the air Z flow in the opposite direction. This makes it possible to eliminate clogging of the filter cloths 40-I and 40-II. That is, from both sides 27-■ of the above-mentioned 10,000 filter plates 5-■, both sides 27-■ of the other filter plate 25-n
After completing the one-way air supply cycle by supplying air to From the other air supply pipe 13b through the communication hole 29b7, every other filter plate 25-TI is connected to both sides of the filter plate 25-TI? 7-■ and the adjacent L filter cloth 40-■ After supplying and filling the gap, the filtered water discharge pipe 15 (which leads to one drainage hole 3Qa)
Filtration water volume during Z Close valve 16α and open after a certain period of time has passed.
Both on-off valves 14h-16a are closed. After supplying this air and sufficiently removing the interstitial water Z in the cake 47, the valve 14 a % 14 b s 16 a
s 16 hY is closed, and the valve 7 is opened to remove the high pressure, undehydrated excess slurry passing hole remaining in the slurry passing hole of the filter press 10 and the slurry supply pipe 9;
After discharging and closing again, the tightening operation is performed by moving the hydraulic cylinder 35 back and operating the opening driving mechanism @ 38, and then moving the filter plate 5 one by one from the filter plate 5 near the movable plate 33. When the frame is opened, the cake 47 in the two filter cloths 40 sandwiched between each filter stone can be peeled off and removed by the inverted V-shaped 1, α cloth spacing. In this way, in the above embodiment, slurry filtration is performed in the same way as a normal filter press, and moreover, by supplying pressurized air,
In the case of a soft cake 47, it is impossible to squeeze out the moisture in the cake by compressing it, and to replace the interstitial water in the cake 47 with air and discharge it outside the cake 47. The moisture content in the cake 47 can be reduced to Z large [1], and due to changes in the physical properties of the cake, peeling and removal of the cake when opening the frame, crushing of the cake 47, and other processes can be carried out smoothly. reactor. In the above embodiment, the maximum slurry supply pressure to the filter press 10 was set to 15 to 25 kg/ca;
/ cI! By setting and supplying pressurized air at an appropriate pressure, the filter plate 5, movable plate 33, tension rod 34, tightening hydraulic cylinder 35, etc. can be made smaller and lighter, and manufacturing costs can be reduced. Not only that, but the tightening can also reduce the hydraulic pressure to the hydraulic cylinder 35, reducing operating costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a seventh embodiment of a filter press according to the invention, FIG. 2 is a perspective view of the same embodiment, and FIGS. 3 and 4 are front views of a filter plate of the same embodiment. Fig. 5 is an enlarged view of the main part, Fig. 6 is a longitudinal cross-sectional side view taken along the line Vl-Vl in Fig. 3, and Fig. 7 is a diagram showing the state in which the filter cloth is attached to the filter plate in the same embodiment. An explanatory diagram - Fig. 8 is an explanatory diagram showing the air-water replacement work Z diagram in the same embodiment cut along the line ■-■ in Figs. FIG. 10 is an enlarged perspective view of the main part of FIG. 2. 1 Yamashisokuna, 2 mountain pump, 3 mountain gravity separation tank, 4
．． 5 to 6.7... Valve, 8... Pressurized slurry supply pump, 9+0 "S' slurry supply k iF, 10" ° Filter press, lIT... Near compressor % 12... Pressurized air storage tank , 13...ψ air supply pipe, 14...
Air opening/closing valve, 15...; Filtered water discharge pipe, 16... Filtered water amount closing valve, addition... Stand, 21... Support beam, 22.°.
Inner picture horizontal piece,...rail, prisoner...temporary filtration hanging fittings, 5...ga...! Overplate, ah...slurry passage hole,
27...filter plate surface, public...air supply hole, 29...
Communication hole, 30... Drain hole, 31... Communication hole, 32.
・Guide sheave, 33 movable plate, 34... Tension rod - 35°・Tightening is for oil field cylinder, 36...
Open frame cheno, 37...Open frame attachment, 38...
- Frame opening drive device, 39... Draining net, 40... Filter cloth, 41... Short cylindrical filter cloth ~ 42... Filter cloth top edge, 43
... Filter cloth hanging bar, 44... Hanging sieve, 45...
Binding wire, 46... tension robe, 47... cake, 4
8... Protrusion. Agent: Patent Attorney Nozomi Ehara, 2 people, Figure 7, Figure 6, Suspension 10, Proceedings Amendment Form, November 4, 1980, Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1, 141 indications, 1988 Patent Application No. 188301, 2 , Title of the invention Filter Press 3, Relationship with the case of the person making the amendment Patent applicant address 2-9-4 Nichifukyo Kayaba-cho, Chuo-ku, Tokyo Representative
Masaaki Watanabe 4, Agent 6 The detailed description of the invention which is increased by the amendment, page 15, line 4 to line 5, ``Ikutsumata...Air opening/closing valve 14bj'' has been amended as follows. Notes

Claims (1)

[Claims] A cloth having concave shapes on both sides, and a filter plate supporting means for supporting the plurality of filter plates in a mutually dependent manner through the filter cloth 2; A means for tightening the filter plates, a means for supplying pressurized slurry by pressurizing slurry between the filter cloths attached to each of the plurality of filter plates, and a pressurized slurry supply means for supplying slurry under pressure between the filter cloths attached to each of the plurality of filter plates, and two filters sandwiched between adjacent filter plates. A filter press characterized in that it is equipped with pressurized gas supply means and χ for pressurizing and supplying gas between any one of the cloths and a filter plate placed adjacent thereto.