JP2000334222A - Filter press device and method for dehydrating sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the improvement in treatment capability, the reduction of the moisture content of cake and the improvement in cake peelability. SOLUTION: Filter plates 2 and 3 are formed of resin material. A diaphragm 2E for compressing the sludge supplied to the inside surface side 4S of filter cloth is disposed between the filter plate 2 on one side and the outside surface of the filter cloth 4 facing the same across a filter chamber 6. The spacing between the diaphragm 2E and the filter plate 2 on one side is formed as a fluid chamber 2D. The diaphragm is not disposed between the filter plate 3 on another side and the outside surface 4 of the filter cloth 4 facing the same. A hollow heat transfer panel 30 is disposed between the filter plate 3 on the other side and the outside surface of the filter cloth 4 facing the same. The hollow space of the heat transfer panel 30 is constituted as a heating chamber 3s. Means (10P, etc.), for supplying the heating fluid to the heating chamber 3s are disposed to suppress the heat conduction from the filter chamber 6 to the outside of the device 1 and from the heat transfer panel 30 to the outside of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly performs pressure filtration and press dewatering of sludge used in dewatering of sludge from waterworks sludge and sewage treatment plants, industrial wastewater or general chemistry and foodstuffs. The present invention relates to a filter press device including a squeeze-type filter press and a sludge dewatering method using the squeeze-type filter press.

[0002]

2. Description of the Related Art Conventionally, tap water sludge has been dewatered using a filter press. In particular, in recent years, the processing capacity of equipment has become insufficient due to deterioration of water quality or the like. As a solution to this problem, sludge supplied to a filter press has been heated to improve the processing capacity.

[0003]

However, although the processing capacity can be improved to some extent by the conventional technique, it is difficult to further reduce the water content of the dewatered cake and to remarkably enhance the peelability of a thin dewatered cake. And
At present, there is no effective means for shortening the filtration and pressing time.

Accordingly, a main object of the present invention is to reduce the water content of a dewatered cake and improve the peelability of a thin dewatered cake while improving the processing capacity, and also to shorten the filtration and pressing time. is there.

[0005]

According to the first aspect of the present invention, there is provided a filter cloth provided in a filter chamber between opposed filter plates, and a sludge is formed on an inner surface of the filter cloth. In a filter press device configured to supply and filter, the filter press includes a sludge preliminary heating unit that heats the sludge prior to the supply of the inner surface of the filter cloth to the waist, and serves as a heat conduction path from the filter chamber to the outside of the device. A filter press device characterized in that a heat conduction suppressing part is provided in a part.

According to a second aspect of the present invention, there is provided a filter press apparatus wherein a filter cloth is provided in a filter chamber between opposing filter plates, and the inner surface of the filter cloth is supplied with sludge for filtration. With a supply sludge heating means for heating the sludge supplied to the inner surface of the filter cloth,
A filter press device characterized in that a heat conduction suppressing portion is provided in a portion serving as a heat conduction path from a heating portion by the supply sludge heating means to the outside of the device.

According to a third aspect of the present invention, there is provided a filter press apparatus wherein a filter cloth is provided in a filter chamber between opposing filter plates, and the filter cloth has an inner surface for supplying sludge to the waist and filtering the sludge. The filter cloth inner surface is provided with sludge preliminary heating means for heating prior to the supply to the wadding, and the filter cloth inner surface is provided with a supply sludge heating means for heating the sludge supplied to the wadding, and at least the A filter press device comprising: a heat conduction path extending from the filtration chamber to the outside of the apparatus; and a heat conduction path extending from the supply sludge heating means to the outside of the apparatus. is there.

According to a fourth aspect of the present invention, there is provided the filter press according to any one of the first to third aspects, wherein a heat conduction suppressing portion is provided on the filter plate serving as the heat transfer path.

The invention according to claim 5 is the filter press device according to any one of claims 1 to 4, wherein the heat conduction suppressing portion is formed of a resin material.

[0010] The invention according to claim 6 is the filter press apparatus according to any one of claims 1 to 5, further comprising pressing means for pressing the sludge supplied to the inner surface of the filter cloth.

According to a seventh aspect of the present invention, there is provided any one of the first to sixth aspects, further comprising a negative pressure means for reducing the pressure in the filter chamber.
It is a filter press apparatus described in the paragraph.

The invention according to claim 8 is a filter press apparatus wherein a filter cloth is provided in a filter chamber between opposed filter plates, and the filter cloth inner surface is configured to supply sludge to the waist for filtering. The filter plate is formed of a heat conduction suppressing material, and between the filter plate on one side of the filter chamber and the filter cloth outer surface facing the filter plate, the filter cloth inner surface is formed of a resin which squeezes the sludge supplied to the alligator. A fluid chamber is formed between the diaphragm and the filter plate 2 on one side, and no diaphragm is disposed between the filter plate on the other side and the outer surface of the filter cloth facing the filter plate. A heat conduction panel having a heating chamber into which a heating fluid is supplied is provided between the filter plate and the outer surface of the filter cloth facing the filter plate, and means for supplying the heating fluid to the heating chamber is provided. , At least heat conduction from the filter chamber to the outside of the apparatus and the heat conduction path. A filter press apparatus being characterized in that none so as to suppress heat conduction to the outside of the apparatus from Le.

According to a ninth aspect of the present invention, there is provided a sludge dewatering method for supplying a sludge to an inner surface of a filter cloth and filtering the filter cloth by using a filter press device provided with a filter cloth in a filter chamber between opposed filter plates. And heating the sludge before supplying the inner surface of the filter cloth to the wrinkles, and suppressing heat conduction from the filter chamber to the outside of the apparatus.

According to a tenth aspect of the present invention, there is provided a filter press device provided with a filter cloth in a filter chamber between opposed filter plates,
In the sludge dewatering method for supplying sludge to the inner surface of the filter cloth and filtering the sludge, the sludge supplied to the inner surface of the filter cloth is heated and heat conduction from the heated portion to the outside of the device is suppressed. A method for dewatering sludge.

The invention according to claim 11 uses a filter press apparatus provided with a filter cloth in a filter chamber between opposed filter plates,
In the sludge dewatering method of supplying sludge to the inner surface of the filter cloth and filtering the sludge, the sludge is heated before the inner surface of the filter cloth is supplied to the inner wall, and the sludge is further heated to the inner surface of the filter cloth. While heating the supplied supply sludge, at least, the heat conduction from the filtration chamber to the outside of the device and the heat conduction from the heating portion of the supply sludge to the outside of the device, characterized in that the sludge dewatering method, is there.

According to a twelfth aspect of the present invention, the sludge supplied to the inner surface of the filter cloth is squeezed.
2. The method for dewatering sludge according to claim 1.

According to a thirteenth aspect of the present invention, there is provided the sludge dewatering method according to any one of the ninth to eleventh aspects, wherein the pressure in the filter chamber is reduced at least at the time of filtration.

<Effect> It has been conventionally known that the filtration capacity is increased by supplying heated sludge during filtration. In the present invention, such a means is employed, or the inner surface of the filter cloth is supplied to the rubber. Either a means for heating the sludge or a combination of the two is used.

However, even if the heated sludge is supplied, the temperature drops within the time until the filtration and dewatering is completed, and the dewatering property decreases with time. Also, even if the sludge supplied to the filter chamber is heated, part of the heat is released to the outside of the apparatus through a heat transfer path such as a filter plate.
Heat transfer efficiency to sludge is not good.

Therefore, in the present invention, a heat conduction suppressing portion is provided in a portion serving as a heat conduction path from the filtration chamber to the outside of the device, a portion serving as a heat conduction path from the supply sludge heating means to the outside of the device, or both portions. Thereby, it is possible to keep the sludge in the filter room warm and to efficiently transfer heat to the sludge. As a result, it is possible to prevent a decrease in filtration dewatering property due to a decrease in temperature in the filtration step.

[0021]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 shows a front view of a first example of a filter press apparatus according to the present invention, FIG. 2 shows a cross-sectional view taken along the line II-II, and FIG. 3 shows a filter plate arrangement. As shown in FIG. 3, the present apparatus 1 includes a filter plate 2 (hereinafter, referred to as a filter plate 2) provided with a diaphragm 2 </ b> E on each filter cloth 4.
A press filter plate) and a filter plate 3 without a diaphragm (hereinafter also referred to as a heated filter plate) are alternately arranged in the horizontal direction, and belong to the horizontal type from the arrangement of the filter plates. It has become something. This heated filter plate 3 is also shown in FIGS.

The first example of the apparatus belongs to a so-called intaglio type, and each filter plate 2, 3 has a concave portion 2a, 3a formed on a surface facing the adjacent filter plate 3, 2, respectively. A pair of filter cloths 4, 4,... Are suspended between adjacent filter plates 2, 3, respectively.

These filter plates 2, 3 are connected to adjacent filter plates via connecting members 109, 109, and are configured such that the mutual interval is adjusted by a cylinder 5 which expands and contracts in the horizontal direction. I have. A shaft 103 is supported on the filter plates 2 and 3 in the horizontal direction, and is rotatable forward and reverse by a filter cloth driving device 102.
03 through pulleys 104, 104 attached to the wire rope 105 and a support bar connected to the lower end of the wire rope.
4 is supported in a suspended state. Then, after raising the support bar 108 for suspending the filter cloth to the upper limit, the adjacent filter plates 2
3 and by tightening, a pair of filter cloths 4 between adjacent filter plates 2 and 3, as shown in FIG.
A filtration chamber 6 surrounded by 4 is formed. This filter room 6
Inside, an external sludge supply path 7F described later communicates with each other via an internal sludge supply path 31 of the heated filter plate 3.
The lower structure of the filter plate will be described later.

In this embodiment, in particular, each pressed filter plate 2 is made of resin, and the concave portions 2a, 2 facing the outer surfaces of the filter cloths 4, 4.
a are formed on the surface thereof so as to cover the liquid filtration chambers 2E, 2E, respectively. Fluid chambers 2D, 2D are provided between the diaphragms 2E, 2E and the outer surface of the compressed filter plate 2. Are formed respectively. An internal fluid supply / discharge passage 2F communicates with each of the fluid chambers 2D. Therefore, it is possible to supply and discharge the fluid F into and from the fluid chambers 2D. The gap SP1 (including inside the filtrate grooves 2e, 2e...) Between the filtrate grooves 2e, 2e... Of the diaphragms 2E, 2E and the outer surface of the filter cloth 4 facing the filtrate grooves 2e, 2e. 2H
The internal pressure air supply passages 2J communicate with each other at the upper end.

On the other hand, the heating filter plate 3 is also made of resin, and has hollow portions 3a, 3a facing the outer surfaces of the filter cloths 4, 4 and hollow heat conduction panels having filtrate grooves 3e, 3e. 30 (for example, a metal panel) are fitted respectively, and a heating chamber 3S through which a heating fluid flows is formed in a hollow space of the heat conduction panel 30, and a lower end and an upper end of the heating chamber 3S are formed at the lower end and the upper end, respectively. Is connected to the internal fluid supply path 3F and the internal fluid discharge path. Therefore, the diaphragm is not arranged between the heating filter plate 3 and the opposing outer surface of the filter cloth 4 unlike the compression filter plate 2. Further, an internal filtrate discharge passage 3H is provided at the lower end of the gap SP2 (including the inside of the filtrate grooves 3e, 3e...) Between the filtrate grooves 3e, 3e. Internal pressure supply path 3J at upper end
Communicates with each other.

Thus, in the present apparatus 1, the main members facing the outside of the apparatus 1, such as the heated filter plate 3, the squeezed filter plate 2, and the diaphragm 2E, are made of resin, so that the filter chamber 6 surrounded by these members is formed. And the heat conduction and heat dissipation from the heat conduction panel 30 (these correspond to the heating portion of the supply sludge heating means) to the outside of the device, respectively, and the sludge in the filter chamber 6 is suppressed. , And highly efficient heat transfer to the sludge in the filter chamber 6 is possible.

Further, in the present apparatus 1, between the filter plate 2 on one side of the filter chamber 6 and the outer surface of the filter cloth 4 facing the filter plate 2, an inner surface of the filter cloth 4S (that is, a filter solid holding member) is provided. In this example, a diaphragm 2E for squeezing the sludge supplied to the pair of filter cloths 4 and 4) is provided, and a fluid chamber 2D is formed between the diaphragm 2E and the filter plate 2 on one side, while the other side is formed. No diaphragm is provided between the filter plate 3 of the above and the outer surface of the filter cloth 4 opposed thereto, and the filter plate 3 on the other side has a filter cloth inner surface 4.
The heating unit (3s constitutes a heating unit) for heating the sludge supplied to S is provided.

On the other hand, referring to the system flow diagram of FIG. 4, the present apparatus 1 includes a sludge supply tank 7A for supplying heated sludge and a sludge storage tank 7A and a sludge S in the sludge storage tank 7A. A sludge heating means 7B (for example, a steam blowing device) for heating, and a sludge storage tank 7A
And a sludge pump 7P for pressurizing and supplying the heated sludge S therein to the filtration chamber 2C via the external sludge supply path 7F. A cleaning liquid supply path 8F having a cleaning valve 8Vf communicates with the external sludge supply path 7F, and a sludge blow path 8B having a sludge blow valve 8Vb is branched from the external sludge supply path 7F.
B communicates with the sludge storage tank 7A. 7Vf shown
Is the cleaning liquid supply path 8F in the external sludge supply path 7F.
And a sludge supply valve disposed between the communication part of the sludge pump and the sludge pump 7P outlet side.

As means 9 for supplying a heating fluid (hot water, steam, etc.) F to the heating chamber 3s in the heat conduction panel 30, in order to heat the supply sludge, a fluid storage tank 9A
Fluid heating means 9B (for example, a steam blowing device) for heating the fluid F in the fluid storage tank 9A, and a fluid storage tank 9A
And a heating fluid supply pump 9P for supplying the heating fluid F therein to the heating chamber 3s via the external fluid supply passage 9F and the internal fluid supply passage 3F. 9Vf is the fluid supply path 9
4 shows a heating fluid supply valve disposed at F. An internal fluid discharge passage 3G communicates with the upper portion of the heating chamber 3s. The heated fluid supplied into the heating chamber 3s is supplied to the fluid storage tank 9 via the internal fluid discharge passage 3G and the fluid return passage 12.
A is to be returned.

Further, in this embodiment, the heated fluid is supplied into the above-mentioned fluid chamber 2D, and is used for expanding the diaphragm 2E. Specifically, a press-fit pump 10P for pressurizing and supplying the heated fluid F in the fluid storage tank 9A to the fluid chambers 2D, 2D via the external fluid supply path 10F and the internal fluid supply path 2F is provided. 10Vf indicates a fluid inlet valve arranged in the external fluid supply passage 10F. With this configuration, even when a resin diaphragm is used, some heat conduction can be expected through the diaphragm 2E.
The warming from the kama will be done. Further, a return path 10R that branches off from a portion of the external fluid supply path 10F between the fluid inlet valve 10Vf and the internal fluid supply path 2F and that communicates with the fluid storage tank 9A is provided, and a relief valve 10Vr is provided in the return path 10R. By doing so, the fluid chambers 2D, 2D
The supply pressure of the warming fluid to D is maintained at or below the set pressure of the relief valve.

Further, in the present apparatus example 1, the internal filtrate discharge passages 2H and 3H of the respective filter plates 2 and 3 are joined while the filtrate outlet valve 11
Filtrate tank 11 via external filtrate discharge passage 11H having Ve
A, and the filtrate in the filtrate tank 11A is supplied to the filtrate storage tank 11C by the filtrate pump 11B according to the stored filtrate amount. Also, the external filtrate discharge path 1
From 1H, a filtrate blow passage 11J having a filtrate blow valve 11Vb is branched, and this filtrate blow passage 11J communicates with a filtrate storage tank 11C. Preferably, as shown in the drawing, a vacuum pump 11D is connected to the filtrate tank 11A, and the vacuum pump 11D connects the filtrate grooves 2e, 3e to the filter cloth via the filtrate tank 11A and the filtrate discharge paths 2H, 3H. 2
The gaps SP1 and SP2 with the outer surface of B are configured to be negative pressure. Further, as shown in the illustrated example, the compressed air supply paths 2J, 3J
When the gaps SP1 and SP2 between the filtrate grooves 2e and 3e and the outer surface of the filter cloth 2B are sucked from the upper part of the gap through the upper suction passage 14 so that the pressure can be reduced to a negative pressure, highly efficient and uniform dehydration of the material to be dehydrated is achieved. Becomes possible.

In the first example of the apparatus, the internal pressure air supply path 2
J and 3J have an external compressed air supply passage 13J and a compressed air tank 1
3, compressed air (for example, compressed air) from the compressor 13C is supplied.

<Example of Dewatering Method> Next, an example of the sludge dewatering method of the present invention using the above-described dewatering apparatus 1 will be described.
This example of the dehydration method mainly includes a filtration step and a subsequent pressing step.

In the filtration step, first, the cylinder 5
(FIG. 1 is shown), the filter plates 2, 3,... Are tightened to close the frame, and a filter chamber 6 is formed as shown in FIG. Also,
Keep all valves closed. Thereafter, the heating fluid supply pump 9P is operated, and the fluid inlet valve 9Vf is opened. Thereby, the fluid F warmed by the heating means 9B
(Hot water or steam) from the fluid storage tank 4A to the external fluid supply path 9
F and heat conduction panel 3 through internal fluid supply passage 3F
It is supplied to the heating chamber 3 s within 0. In the present example, the heating fluid supplied to the heating chamber 3s is returned to the fluid storage tank 9A via the upper fluid discharge path 3G and the fluid return path, and after being heated by the heating means 9B, is again heated. 3s. By performing the circulation in this manner, a newly heated heating fluid is always present in the heating chamber 3s.

Simultaneously or subsequently, the sludge pump 7P is operated, the sludge supply valve 7Vf is opened, and the heated sludge S which has been previously heated by the heating means 7B and stored in the sludge storage tank 7A.
Is supplied under pressure between the filter cloths 4 in the filter chamber 6 via the external and internal sludge supply paths 7F and 31. This state is shown in FIG. The sludge S1 in the filtration chamber 6 has only the filtrate filtered by the filter cloth 4, depending on the supply pressure of the sequentially sent sludge.
Through 4, the filtration proceeds. At this time, the heat of the heating fluid passing through the heating chamber 3s is passed through the heat conduction panel 30 to the filter cloth 4,
The sludge is transmitted to the sludge between four, and the filtration proceeds while the sludge is heated.

At this time, one of the filtrate outlet valve 8Ve and the filtrate blow valve 8Vb is opened, and in each case, the filtrate is supplied to the filtrate grooves 2e of the diaphragm 2E and the filtrate grooves 3e of the heat conduction panel. , Internal filtrate discharge channels 2H, 3
H and the filtrate storage tank 1 via the external filtrate discharge passage 11H.
It is discharged into 1C (details will be described later).

After a predetermined time has passed, for example, the sludge pump 7
P is stopped and the sludge supply valve 7P is closed to complete the filtration step, and then to the pressing step (the pressing step can be performed while the sludge is being supplied).

In the squeezing step, the heating chamber 3s in the heat conducting panel 30 of the heating filter plate 3 is supplied with the heating fluid (preferably continuously supplied from the filtration step). It is preferable to inject a fluid into 2D. That is, in the case of the illustrated example, the heating fluid supply valve 10Vf is opened, and the heating fluid press-in pump 10P is operated.
The heating fluid stored in the heating fluid storage tank 9A is supplied to the fluid chamber 2 via the heating fluid press-in passage 10F and the internal supply passage 2H.
Press-fit into D. The supply pressure at this time is maintained at or below the set pressure by the action of the relief valve 10Vr as described above. As a result, as shown in FIG. 6, the fluid chambers 2D, 2D
Is higher than the internal pressure of the filter chamber 2C, the differential pressure causes the diaphragm 2E to swell from the compressed filter plate 2 to the heated filter plate 3, and the expanded diaphragm 2E causes the inside of the filter chamber 6 to expand. The sludge S1 to be dehydrated is sandwiched between the filter cloths 4 and 4 and pressed.

Thus, even during the pressing, the heating room 3S
The heating fluid passing through the inside mainly heats the heat conduction panel 30, and the heating fluid in the fluid chamber 2D effectively heats the sludge between the filter cloths 4 and 4 through the auxiliary of the diaphragm 2E. I do. Thereby, at least the sludge between the filter cloths 4 and 4 is kept warm. By this heating, highly efficient compression filtration is performed.

After a lapse of a predetermined time, the heating fluid supply valve 10Vf is closed, the heating fluid press-in pump 10P is stopped, and the fluid return valve 4Vb is opened. Thereby, the fluid chamber 2D is returned to the fluid storage tank 9A via the fluid return path 4C.

In the present invention, the pressing operation and the opening operation can be alternately repeated during the filtration step (usually repeated several times). Thereby, sludge is rubbed and loosened, and it is possible to promote the filtering action by pressing.

Further, a series of cycles of a filtration operation, a pressing operation, and an opening operation can be repeated. In this case, since the dewatered material after pressing has a small volume, it is further added to the filtering chamber 6. Hot sludge can be injected (in this case, the diaphragm 2E is pushed back to return to the state shown in FIG. 5), and not only the filtration action is enhanced by squeezing but also the drastic increase in the amount of sludge S supplied (injected). Can be planned. When the squeezing process is completed, the press-fit pump 4P is stopped, and the open valve is closed.

Here, the discharge form of the filtrate in the filtration step and the pressing step can be selected mainly from the following methods. That is, the first method is to open the filtrate outlet valve 11Ve, close the filtrate blow valve 11Vb, and operate the vacuum pump 11D. Thus, the filtrate tank 11A, the external filtrate discharge path 11H, the internal filtrate discharge paths 2H, 3H, the filtrate grooves 2e of the diaphragm 2E,.
Are negative pressure, the discharge of the filtrate during filtration or squeezing is promoted, and the water content of the dewatered cake can be reduced. In this case, the filtrate is the diaphragm 2E
, And the filtrate grooves 3e,... Of the heat conduction panel 30 are sent to the filtrate tank 11A via the internal filtrate discharge paths 2H, 3H and the external filtrate discharge path 11H.
It is temporarily stored in the filtrate tank 11A. And the filtrate tank 1
The filtrate in the filtrate tank 11A is pumped out by the filtrate pump 11B that automatically operates according to the filtrate storage amount in 1A,
It is discharged into the filtrate storage tank 11C.

In the second method, the filtrate blow valve 11Vb is opened, the filtrate outlet valve 11Ve is closed, and the vacuum pump 11D
Is a method that does not operate. In this case, the filtrate passes through the filtrate grooves 2e, 2e,... Of the diaphragm 2E and the filtrate grooves 3e,.
H, 3H, external filtrate discharge channel 11H, filtrate blow channel 11J
And discharged directly to the filtrate storage tank 11C.

The most effective method is to open the filtrate blow valve 11Vb and close the filtrate outlet valve 11Ve during the filtration step, allow the filtrate to flow naturally, and keep the same for a predetermined time after the squeezing step. Later, when the amount of filtrate is reduced, the filtrate outlet valve 11Ve is opened and the filtrate blow valve 11 is opened.
In this method, Vb is closed, and at the same time, the vacuum pump 11D is operated to make the filtrate discharge path a negative pressure. In this method, while the filtrate is naturally discharged, the filtrate discharge path is not set to a negative pressure,
Since the filtrate discharge path is set to a negative pressure from the time when the filtrate becomes difficult to discharge naturally, the filtrate discharge path is always set to the negative pressure in the filtration step or the squeezing step, while promoting the discharge of the filtrate and reducing the water content of the cake. There is an advantage that the energy consumption by the vacuum pump 11D can be reduced as compared with the case where it is performed.

On the other hand, when the above-mentioned pressing step and the filtering step are completed, it is recommended to perform a blowing step subsequently. In this blow step, the cleaning valve 8Vf and the sludge blowing valve 8Vb are opened, and the sludge in the sludge supply path including the external sludge supply path 7F is blown to the sludge storage tank 7A by the cleaning water.

Next, the cleaning valve 8Vf is closed and the compressed air inlet valve 13Vf is opened to release the compressed air stored in the compressed air chamber 13A by the compressor 13B as shown in FIG.
External compressed air supply passage 13J and internal compressed air supply passages 2J, 3
J, the washing water remaining in the sludge supply path including the external sludge supply path 7F is blown to the sludge storage tank 7A via the filtrate grooves 2e, 2e of the diaphragms 2D, 2D and the filtrate grooves 3e,. Preferably, the compressed air blow is performed before and after the cleaning water blow.

More preferably, after the elapse of the predetermined time, the sludge blow valve 8Vb is closed, the fluid blow valve 4Vb and the filtrate blow valve 8Vb are opened, and subsequently supplied compressed air is supplied into the filter chamber 6 this time. The heated air in the fluid chamber 2D is returned to the fluid storage tank 9A via the fluid blow path 4C by the action of the supply air into the filtration chamber 6, and the filtrate grooves 2e,. The filtrate remaining in the filtrate grooves 3e,... Of the panel 30 is blown into the filtrate storage tank 11C via the internal filtrate discharge paths 2H, 3H, the external filtrate discharge path 11H, and the filtrate blow path 11Hb.

With the above, the filtration, squeezing and blowing steps are completed.
Since the dehydrated cake K has been formed in the filter chamber 6, the process proceeds to the discharging step. In the discharging step, first, as understood from a comparison between FIG. 8 and FIG. 1, the loose head 101 is opened by contracting the cylinder 5, and the filter plates 2, 3. It is sequentially towed, and the frames are opened so that the intervals between the filter plates 2 and 3 are constant. Subsequently, the drive shaft 103 is rotated by the filter cloth drive device 102, and the pulley 1
Each of the filter cloths 4 is wound on each of the take-up rolls 107 via each of the return rolls 106 so that the wire rope 105 wound on the wire 04 can be unwound and the lower ends of the attached filter cloths 4 and 4 are opened. This winding is performed in accordance with the amount of filter cloth descending with the feeding of the wire rope 105, and the filter cloths 4, 4 are always pulled between the support bar 108 and each of the return rolls 106 to be in a substantially flat state. You.

Thus, the return rolls 106, 106
The dewatered cake K formed between the filter cloths 4 and 4 is peeled off and discharged from the filter cloths 4 and 4 by the action of the sharp turning of the filter cloths 4 and 4 and the weight of the filter cloths 4 and 4. Normally, the dewatered cake K can be peeled off only by driving the filter cloth, but when the peelability is poor, the return rolls 106,
A scraper (not shown) for scraping the cake from the filter cloth 4 can be provided on the opposite side of the filter cloth 106 so that the dewatered cake attached to the filter cloths 4 can be positively peeled off.

<Others> Although the diaphragm 2E of the present invention can be formed of a resin such as a rubber material, at least a portion of the diaphragm 2E corresponding to the filter chamber via the filter cloth is made of a material having high thermal conductivity, for example, It is preferably formed of a steel plate having a thickness small enough to have flexibility (a stainless steel plate is particularly preferable from the viewpoint of rust prevention). For example,
Although not shown, the outer edge portion of the diaphragm which does not substantially contribute to the above-described heat retaining effect is formed of a flexible material having low thermal conductivity such as a rubber material, and the central portion which substantially contributes to the heat retaining effect is made of metal or the like. It can also be formed of a hard material having high thermal conductivity.

In the above description, an example of application to a filter cloth traveling type is shown, but the present invention is also applicable to a filter cloth hanging type dehydrator. Further, in the present invention, in addition to the upper feed for supplying the sludge from the upper portion of the filter plate as in the above-described example, the center feed for supplying the heated sludge from the center portion of the filter plate, or the underfeed for supplying the sludge from the lower portion of the filter plate You can also do.

Further, in the present invention, the opening and closing of the valves, the starting and stopping of the pump, the closing and opening of the frame by the cylinder, and the like in the above-mentioned specific examples can be automatically controlled by a suitable control device.

[0054]

As described above, according to the present invention, it is possible to increase the amount of sludge injected, shorten the time required for filtration and pressing, significantly reduce the water content of the dewatered cake, and improve the peelability of the dewatered cake. And, as a whole, the filtration dewatering ability can be enhanced.

[Brief description of the drawings]

FIG. 1 is a front view of an example of a filter press device according to the present invention.

FIG. 2 is a vertical sectional view showing a II-II section of FIG. 1;

FIG. 3 is a vertical sectional view of a main part showing an arrangement of filter plates.

FIG. 4 is a flowchart showing an example of a filter press device according to the present invention.

FIG. 5 is a vertical sectional view of a main part showing a filtration step.

FIG. 6 is a vertical sectional view of a main part showing a pressing step.

FIG. 7 is a vertical sectional view of a main part showing a blowing step.

FIG. 8 is a vertical sectional view of a main part showing a cake discharging step.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Filter press apparatus, 2 ... Compressed filter plate, 3 ... Heated filter plate, 4 ... Filter cloth, 2E ... Diaphragm, 2D ... Fluid chamber.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroki Aoyagi 2-17-15 Tsukushima Tsukushima Machine, Chuo-ku, Tokyo Inside Tsukishima Machinery Co., Ltd. (72) Inventor Akio Koike 2-17-15 Tsukushima Machine, Chuo-ku, Tokyo Tsukishima Machine F term in the company (reference) 4D018 AA02 AA16 BB02 BB04 BB14 BB15 BB17 BB19 CC02 CC03 CC05 DD01 4D059 AA03 AA07 BE16 BF02

Claims (13)

[Claims] 1. A filter press apparatus, wherein a filter cloth is provided in a filter chamber between opposed filter plates, and wherein the inner surface of the filter cloth is configured to supply sludge to a waist for filtering. A filter press device comprising: a sludge preliminary heating means for heating prior to the supply to the crocodile; and a heat conduction suppressing portion provided in a portion serving as a heat conduction path from the filter chamber to the outside of the device. 2. A filter press apparatus, wherein a filter cloth is provided in a filter chamber between opposed filter plates, and wherein the filter cloth inner surface supplies sludge to the filter and filters the filter cloth. Supply sludge heating means for heating the sludge supplied thereto, and a heat conduction suppressing section is provided in a portion serving as a heat conduction path from the heating portion by the supply sludge heating device to the outside of the device. A filter press device. 3. A filter press apparatus wherein a filter cloth is provided in a filter chamber between opposing filter plates, and wherein the inner surface of the filter cloth is adapted to supply sludge to the waist and filter the sludge. A sludge preliminary heating means for heating prior to the supply to the alligator, and a supply sludge heating means for heating the sludge whose inner surface of the filter cloth has been supplied to the alligator, and at least, from the filtration chamber to the outside of the apparatus. A filter press device, wherein a heat conduction suppressing section is provided in each of a portion serving as a heat conduction path to reach and a portion serving as a heat conduction path from the supply sludge heating means to the outside of the device. 4. The filter press device according to claim 1, wherein a heat conduction suppressing portion is provided on the filter plate serving as the heat transfer path. 5. The filter press device according to claim 1, wherein said heat conduction suppressing portion is formed of a resin material. 6. The filter press according to claim 1, further comprising a squeezing means for squeezing the sludge supplied to the inner surface of the filter cloth. 7. The filter press according to claim 1, further comprising a negative pressure means for reducing the pressure in the filter chamber. 8. A filter press apparatus wherein a filter cloth is provided in a filter chamber between opposing filter plates, and wherein the filter cloth has an inner surface for supplying sludge to a filter and filtering the filter plate. Along with the filter chamber, a resin diaphragm is provided between the filter plate on one side of the filter chamber and the outer surface of the filter cloth facing the filter plate, and the inner surface of the filter cloth squeezes the sludge supplied to the alligator, A fluid chamber is formed between the diaphragm and the filter plate 2 on one side, and no diaphragm is provided between the filter plate on the other side and the outer surface of the filter cloth facing the filter plate. A heat conduction panel having a heating chamber into which a heating fluid is supplied, and a means for supplying a heating fluid to the heating chamber is provided between the filter chamber and an outer surface of the filter cloth; From the heat transfer panel to the outside of the device A filter press device characterized by suppressing conduction. 9. A sludge dewatering method for supplying sludge to an inner surface of a filter cloth and filtering the sludge using a filter press apparatus provided with a filter cloth in a filter chamber between opposing filter plates, A method for dewatering sludge, characterized in that the inner surface is heated before being supplied to the wales, and the heat conduction from the filter chamber to the outside of the apparatus is suppressed. 10. A sludge dewatering method in which a filter cloth is provided in a filter chamber between opposed filter plates and sludge is supplied to the inner surface of the filter cloth and filtered, wherein the inner surface of the filter cloth is A method for dewatering sludge, comprising heating sludge supplied to a crocodile and suppressing heat conduction from the heated portion to the outside of the apparatus. 11. A sludge dewatering method for supplying and filtering sludge to an inner surface of a filter cloth using a filter press apparatus provided with a filter cloth in a filter chamber between opposing filter plates, wherein the sludge is filtered by the filter cloth. While the inner surface is heated before being supplied to the wadding, and the inner surface of the filter cloth is further heated to supply sludge supplied to the wadding, at least heat conduction from the filter chamber to the outside of the device and the supply A method for dewatering sludge, comprising suppressing heat conduction from a heated portion of sludge to the outside of the apparatus. 12. The sludge dewatering method according to claim 9, wherein the sludge supplied to the inner surface of the filter cloth is squeezed. 13. The sludge dewatering method according to claim 9, wherein the pressure in the filter chamber is reduced to a negative pressure at least at the time of filtration.