JP4117706B2 - Dehydration dryer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to water-containing materials such as sludge and food dehydration drying equipment for dehydration drying, as well as dehydrated particular hydrate pressurized, warmed by hot fluid (e.g., hot water or steam) Dry about the dehydration and drying equipment to.
[0002]
[Prior art]
Today, with changes in lifestyle and environmental changes, the concentration and dewatering properties of sludge discharged from water and sewage facilities are getting worse year by year. Concentration and dewatering of sludge is mainly performed by a dehydrator. However, as described above, the load on the dehydrator increases as the sludge concentration and dewaterability deteriorates. Problems such as a decrease in speed and an increase in the moisture content of the cake (dehydrated sludge) have arisen. On the other hand, with the decrease in landfill sites, there is an increasing demand for volume reduction and effective use of discharged sludge.
[0003]
There is a limit to the moisture content of the dehydrated cake obtained by mechanically dewatering sludge, and in order to reduce the moisture content even lower than the limit value, dry matter with low moisture content such as sawdust and rice husk should be sludged. Heating operations such as mixing and drying are necessary. However, there is a problem that the amount of sludge increases when the dried product is mixed with sludge. In addition, in order to dry the sludge, a separate dryer is required, the process becomes complicated, the initial cost increases, and a great deal of labor is required for the maintenance of the dryer.
[0004]
In order to solve these problems, a filter press-type dehydration drying apparatus including a heat source generator and a vacuum generator has been proposed (see Patent Document 1). According to this apparatus, after the dehydration process is completed, the inside of the filter press (pressure filter) is evacuated by the vacuum generator, and the heat of the hot water supplied from the heat source generator is transmitted to the dehydrated cake through the diaphragm. As a result, the dewatered cake in the filter press is dried.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-232109
[Problems to be solved by the invention]
However, in such an apparatus, since the heat transfer member (diaphragm) is a resin such as rubber, the thermal conductivity is poor, and it takes time to dry the dehydrated cake, and the apparatus becomes large. In particular, such a problem is remarkable when organic sludge is targeted.
[0007]
The present invention has been made to solve the above problems, and an object thereof is to provide a dewatering drying equipment which can be made compact shortening and apparatus of the drying time.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention includes a filter cloth that forms a filter chamber, a metal member that is disposed adjacent to the filter cloth and is movable to the filter cloth side, and the metal A filter frame that holds the member, and a fluid supply mechanism that supplies a high-temperature fluid to the fluid chamber formed by the metal member and the filter frame, and the metal member has a bellows extending along a peripheral edge thereof. The bellows is formed from a part of the metal member, the metal member is fixed to the filter frame via the bellows, and when fluid is supplied to the fluid chamber, The metal member is a dehydrating and drying apparatus that presses the filter cloth against water-containing matter in the filter chamber.
According to a second aspect of the present invention, a filter cloth forming a filter chamber, a metal member disposed adjacent to the filter cloth and movable to the filter cloth side, a filter frame holding the metal member, A fluid supply mechanism for supplying a high-temperature fluid to a fluid chamber formed by the metal member and the filter frame, and the metal member is slidably accommodated on the filter cloth side and the counter filter cloth side in the filter frame. When the fluid is supplied to the fluid chamber, the metal member presses the filter cloth against the hydrated material in the filter chamber.
[0009]
ADVANTAGE OF THE INVENTION According to this invention, the heat | fever of the fluid supplied in the fluid chamber can be efficiently transmitted to the hydrated material in a filter chamber via a metal member. Therefore, heat can be applied to the hydrated product to evaporate water in the hydrated product, and the hydrated product can be effectively dried.
[0010]
A preferred aspect of the present invention is further characterized by further comprising a vacuum generation mechanism that depressurizes a gap formed between the filter cloth and the metal member.
According to the present invention, it is possible to further promote drying of the hydrous material.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a dehydration drying apparatus and a dehydration drying method according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an overall configuration of a dehydrating and drying apparatus according to a first embodiment of the present invention. In the present embodiment, sludge is used as the hydrated material (slurry or sludge-like material to be treated), but the present invention is not limited to this, and the present invention is also applicable to dehydration drying of foods containing water. Can be applied.
[0014]
As shown in FIG. 1, the dehydrating and drying apparatus includes a plurality of dehydrating and drying units 1, a hot water boiler 2 that generates hot water (high-temperature fluid), and a vacuum pump (vacuum generation mechanism) 3. The plurality of dehydrating and drying units 1 are fastened by a fastening device 16 and fixed to each other. A communication pipe 15 is arranged at the upper part of the dehydration drying unit 1, and this communication pipe 15 is connected to a sludge storage tank (not shown) via a sludge supply line 4. The sludge supply line 4 is provided with a sludge supply pump 5 for transferring the sludge and an on-off valve V1. The sludge supply line 4 is connected to a blow line 6 having an on-off valve V4, and the communication pipe 15 is connected to a sludge discharge line 14 having an on-off valve V5. In such a configuration, the sludge is supplied from the sludge storage tank to each dehydration drying unit 1 through the communication pipe 15 by driving the sludge supply pump 5 with the on-off valve V1 opened and the on-off valves V4, V5 closed. Is done.
[0015]
Hot water headers 17 </ b> A and 17 </ b> B are connected to the lower and upper portions of each dehydrating and drying unit 1, respectively. The hot water header 17A is connected to the hot water boiler 2 via the hot water circulation line 7A, and the hot water header 17B is connected to the hot water boiler 2 via the hot water circulation line 7B. Thus, the dehydration drying part 1 and the hot water boiler 2 are mutually connected by the hot water circulation lines 7A and 7B.
[0016]
A warm water circulation pump 8 is installed in the warm water circulation line 7A for supplying warm water from the warm water boiler 2 to the dehydration drying unit 1, and a back pressure valve 9 is installed in the warm water circulation line 7B for returning the warm water from the dehydration drying unit 1 to the warm water boiler 2. Has been. The back pressure valve 9 is configured to be able to adjust the flow rate of the hot water flowing through the hot water circulation line 7B, and by operating the back pressure valve 9, the pressure of the hot water supplied to the dehydration drying unit 1 can be adjusted. It can be done. The hot water boiler 2 and the hot water circulation pump 8 constitute a fluid supply mechanism for supplying a high-temperature fluid as a pressurized medium to a fluid chamber (described later) of the dehydration drying unit 1.
[0017]
A filtrate discharge line 10 having an on-off valve V2 is connected to the dehydration drying unit 1, and a vacuum exhaust line 11 is connected to the filtrate discharge line 10. The vacuum exhaust line 11 is provided with an on-off valve V3, a drain pot 12, and a vacuum pump 3. A cooling liquid circulation mechanism (not shown) is connected to the drain pot 12, and the cooling liquid is circulated between the cooling liquid circulation mechanism and the drain pot 12.
[0018]
2 (a) and 2 (b) are cross-sectional views showing the dehydrating and drying unit shown in FIG. As shown in FIG. 2A, the dehydrating and drying unit 1 includes a rectangular hollow body 24 having a hollow inside, a pair of filter cloths 23 disposed on both sides of the hollow body 24, and each filter cloth 23. A pair of thin metal plates (metal members) 25 disposed on the outside and a pair of filter frames 26 that hold the respective metal plates 25 are provided. The filter chamber 22 is formed by a pair of filter cloths 23 and a hollow body 24, and sludge is supplied into the filter chamber 22 from a sludge supply port 24 a formed at the top of the hollow body 24.
[0019]
The metal plate 25 and the filter cloth 23 are disposed adjacent to each other. A plurality of protrusions 28 are provided on the surface of the metal plate 25 on the filter cloth side, and the tips of these protrusions 28 are in contact with the filter cloth 23. Therefore, a minute gap G is formed between the metal plate 25 and the filter cloth 23 by the protrusion 28. In addition, it is preferable that the protrusion part 28 is manufactured from a metal with high heat conductivity. The metal plate 25 is formed in a rectangular shape, and the peripheral edge is fixed to the filter frame 26. The metal plate 25 is formed with bellows (extensible / contracting portion) 27 extending along the peripheral edge thereof, and the metal plate 25 can be moved to the filter cloth side by extending the bellows 27.
[0020]
The material of the metal plate 25 is not particularly specified, but a material having high thermal conductivity is preferable. In this embodiment, SUS304 (stainless steel) is used. A resin such as polypropylene is used as a constituent material of the filter frame 26, but it may be a metal or may be integrated with a bellows (expandable part). In the present embodiment, the bellows 27 is formed by forming a plurality of folded portions on a part of the metal plate 25. However, the stretchable portion made of resin or the like is fixed to the peripheral portion of the metal plate 25. Also good.
[0021]
A filtrate discharge hole 20 is provided in the lower part of the hollow body 24 and the lower part of the pair of filter frames 26, and the filtrate discharge hole 20 is a gap G formed between the metal plate 25 and the filter cloth 23. Communicating with The filtrate discharge hole 20 is connected to the vacuum pump 3 through the filtrate discharge line 10 and the vacuum exhaust line 11 (see FIG. 1). With such a configuration, the water contained in the sludge is filtered by the filter cloth 23, and the water filtered by the filter cloth 23 (hereinafter referred to as filtrate) flows down in the gap G and flows into the filtrate discharge hole 20. Thereafter, the filtrate is discharged to the outside of the dehydrating and drying apparatus via the filtrate discharge line 10 and the vacuum exhaust line 11. Furthermore, by operating the vacuum pump 3, the gap G formed between the metal plate 25 and the filter cloth 23 is maintained in a reduced pressure atmosphere of, for example, about 0.03 MPa.
[0022]
A fluid chamber 30 is formed between the metal plate 25 and the filter frame 26. That is, a recess 26 a is formed on the surface of the filter frame 26 on the metal plate side, and the fluid chamber 30 is defined by the recess 26 a of the filter frame 26 and the metal plate 25. An upper fluid hole 26 b and a lower fluid hole 26 c communicating with the fluid chamber 30 are formed in the upper and lower portions of the filter frame 26, respectively. The lower fluid hole 26c is connected to the hot water header 17A, and the upper fluid hole 26b is connected to the hot water header 17B (see FIG. 1). Accordingly, the hot water generated by the hot water boiler 2 is supplied to the fluid chamber 30 through the hot water circulation line 7A, the hot water header 17A, and the lower fluid hole 26c as the hot water circulation pump 8 is driven. The upper fluid hole 26b, the hot water header 17B, and the hot water circulation line 7B are returned to the hot water boiler 2. In this way, the hot water circulates between the hot water boiler 2 and the fluid chamber 30. Note that the pressure of the hot water supplied to the fluid chamber 30 is quickly adjusted to a desired pressure by operating the back pressure valve 9 (see FIG. 1).
[0023]
As shown in FIG. 2B, when hot water (pressurized fluid) is supplied to the fluid chamber 30, the pair of metal plates 25 receives the pressure of the hot water and moves to the filter cloth side, whereby the filter chamber 22. Decrease in volume. As the metal plate 25 moves, the sludge S in the filter chamber 22 is pressed by the filter cloth 23, whereby water contained in the sludge S flows into the gap G between the filter cloth 23 and the metal plate 25. In this way, the dewatering of the sludge S is performed. Moreover, the heat of warm water is transmitted to the sludge S in the filter chamber 22 through the metal plate 25 and the filter cloth 23, and thereby the sludge S is heated. As a result, the water contained in the sludge S evaporates and the sludge S becomes cake-like. Further, the gap G between the metal plate 25 and the filter cloth 23 is evacuated by the vacuum pump 3, whereby water contained in the sludge S (cake) in the filter chamber 22 is further evaporated, and the sludge S is dehydrated and dried. Promoted.
[0024]
In the present embodiment, a filter press (pressure filter) capable of pressing on both sides with a filtration area (heat transfer area) of 2 m ² is used as the dehydration drying unit 1. In this embodiment, hot water is used as the high-temperature fluid, but steam, high-temperature gas, or the like may be used in addition to the hot water.
[0025]
Next, the operation of the dehydration drying apparatus according to this embodiment will be described.
First, each dehydration drying unit 1 is fixed at a predetermined position by the fastening device 16. A surplus sludge (concentration: 2.3%) stored in a sludge storage tank (not shown) contains 1.5% polyferric sulfate (as Fe) and 0.5% polymer such as Ebagulose B-034. Add and temper (tempering process). Then, the sludge supply pump 5 is driven, and excess urine sludge stored in a sludge storage tank (not shown) is passed from the upper part of the dehydration drying unit 1 to the filter chamber 22 through the on-off valve V1 and the communication pipe 15 for 30 minutes. Type in (pump). At this time, the on-off valve V1 is adjusted so that the filtration pressure in the filter chamber 22 is about 0.5 MPa at the maximum. The filtration pressure is preferably set to 0.5 MPa or more (maximum 1.5 MPa), but may be set to 0.5 MPa or less in some cases. Moreover, when it is not necessary to temper sludge, the tempering step can be omitted. In addition, sludge may be supplied from the lower part of the dehydration drying part 1, and the supply position of sludge is not specifically limited.
[0026]
Thus, the water in the sludge supplied to the filter chamber 22 is filtered by the filtration pressure produced | generated with the sludge supply pump 5 (filtration process). The filtrate that has passed through the filter cloth 23 flows down the gap G between the filter cloth 23 and the metal plate 25, is guided to the filtrate discharge line 10 through the filtrate discharge hole 20, and passes through the on-off valve V2. Discharged outside.
[0027]
Next, after setting the pressing pressure to 1.5 MPa with the back pressure valve 9, the hot water circulation pump 8 is operated to supply hot water heated to a predetermined temperature to the fluid chamber 30. And the metal plate 25 is moved to the filter cloth side (filter chamber side) by the fluid pressure in the fluid chamber 30, the volume of the filter chamber 22 is reduced, and sludge is squeezed. At this time, the heat of warm water is transmitted to the sludge in the filter chamber 22 through the metal plate 25 and the filter cloth 23, the sludge is heated, and the water in the sludge evaporates. In this way, the first dehydration drying process is performed (see FIG. 2B). In addition, it is preferable that the temperature of warm water is 70-90 degreeC.
[0028]
At the same time or after the first dehydration drying step, the on-off valve V2 is closed and the on-off valve V3 is opened, the vacuum pump 3 is operated, and the gap G between the metal plate 25 and the filter cloth 23 is evacuated, and in the sludge Promotes evaporation of the water (second dehydration drying step). The pressure in the gap G is preferably as low as possible and is preferably 0.03 MPa or less.
[0029]
As described above, the water in the sludge is removed from the filter chamber 22 by dehydration by dynamic squeezing force, evaporation by heat of hot water, and evaporation by vacuum. The removed water is condensed by exchanging heat with the coolant in the drain pot 12 and discharged as condensed water. The time required for the dehydration drying process (the filtration process, the first dehydration drying process, and the second dehydration drying process) varies depending on the type of sludge and the target moisture content, and the amount of sludge supplied to the filter chamber 22 and each process. Calculated from the amount of discharged wastewater. In this embodiment, the target moisture content is set to 35%. As a result, in this embodiment, the time required for the dehydration drying process was 60 to 70 minutes. On the other hand, in the conventional example, the moisture content was 55% even after 180 minutes, and the target value could not be achieved. This largely depends on the thermal conductivity of the heat transfer member. In the present embodiment, the thermal conductivity of the metal plate 25 is 15 W / mK, whereas in the conventional example, the thermal conductivity of the diaphragm formed of resin. Is 0.23 W / mK, and the metal plate 25 of the present embodiment has a thermal conductivity 65 times that of a conventional diaphragm.
[0030]
After completion of the second dehydration drying step, the on-off valve V1 is closed and the on-off valves V4, V5 are opened, and 0.5 MPa of pressurized air is blown into the sludge supply line 4 and remains in the sludge supply line 4 and the communication pipe 15. Discharge soft sludge (blow process). The discharged sludge is collected in the sludge storage tank. Next, the fastening device 16 is loosened, the dehydrating and drying unit 1 is opened from the portion indicated by the arrow A in FIG. 2B, and the dewatered and dried sludge (hereinafter referred to as cake) is discharged from the filter chamber 22 (cake discharging step). ). As a result of collecting and analyzing the cake, the water content was 32.2 to 33.8%. Thus, since the cake is in a dry state, it can be made into particles and peeled off from the filter cloth 23 satisfactorily. Therefore, almost no cake remained on the filter cloth 23, and the cleaning process of the filter cloth 23 was unnecessary. The metal plate 25 moved to the filter cloth side moves to the anti-filter cloth side by supplying new sludge to the filter chamber 22.
[0031]
The dehydrating and drying apparatus according to the present embodiment is a so-called dual type apparatus in which independent filter chambers are formed inside each dehydrating and drying unit 1. The present invention can also be applied to a so-called single-type dehydrating and drying apparatus in which is formed.
[0032]
Next, a second embodiment of the present invention will be described with reference to FIGS. 3 (a) and 3 (b). FIG. 3A and FIG. 3B are cross-sectional views showing a dehydrating and drying unit according to the second embodiment of the present invention. Note that the configuration and operation that are not particularly described are the same as those in the first embodiment described above, and thus redundant description thereof is omitted.
[0033]
As shown in FIG. 3A, the dehydrating and drying unit 40 includes a pair of metal boxes (metal members) 41 respectively held by the pair of filter frames 26. Recesses 26a are respectively formed on the surface of the filter frame 26 on the metal box side, and the metal box 41 is slidably accommodated in these recesses 26a. The metal box 41 has a shape in which the surface on the side of the warp cloth is opened. That is, the metal box 41 includes a rectangular side portion 41a extending in parallel with the filter cloth 23, and a peripheral wall portion 41b extending vertically from the peripheral edge portion of the side portion 41a. A plurality of protrusions 28 are provided on the surface of the side portion 41 a on the filter cloth side, and the tips of these protrusions 28 are in contact with the filter cloth 23. A seal member 42 is disposed between the peripheral wall portion 41b and the concave portion 26a.
[0034]
A fluid chamber 30 is formed between the metal box 41 and the filter frame 26, and the fluid chamber 30 is defined by the recess 26 a of the filter frame 26 and the inner surface of the metal box 41. An upper fluid hole 26 b and a lower fluid hole 26 c communicating with the fluid chamber 30 are formed in the upper and lower portions of the filter frame 26, respectively. These upper fluid hole 26b and lower fluid hole 26c are connected to hot water headers 17B and 17A, respectively. A filtrate discharge hole 20 that communicates with a gap G between the filter cloth 23 and the side portion 41 a of the metal box 41 is formed at the lower portion of the filter frame 26. The filter cloth 23 is fixed to the filter frame 26 by a fixing member 43, and a sludge supply port 43 a is formed between the fixing members 43.
[0035]
As shown in FIG. 3B, when warm water is supplied to the fluid chamber 30, the pair of metal boxes 41 receives the pressure of the warm water and moves to the filter cloth side, thereby reducing the volume of the filter chamber 22. . At this time, the heat applied to the metal box 41 causes the metal box 41 to expand, and the sealing member 42 and the recess 26a of the filter frame 26 are brought into close contact with each other to maintain the sealing performance. As the metal box 41 moves, the sludge S in the filter chamber 22 is pressed by the filter cloth 23, whereby water contained in the sludge S flows into the gap G between the filter cloth 23 and the metal box 41. In this way, the dewatering of the sludge S is performed. Moreover, the heat of warm water is transmitted to the sludge S in the filter chamber 22 through the metal box 41 and the filter cloth 23, and the sludge S is heated by this. As a result, the water contained in the sludge S evaporates and the sludge S becomes cake-like. Further, the gap G between the metal box 41 and the filter cloth 23 is evacuated by the vacuum pump 3 (see FIG. 1), whereby the water contained in the sludge S (cake) in the filter chamber 22 is further evaporated, and the sludge S dehydration drying is promoted. In addition, after completion | finish of a dehydration drying process, the dehydration drying part 40 is opened from the site | part shown by arrow B of FIG.3 (b), and the dewatered sludge (cake) is discharged | emitted from the filter chamber 22. FIG. The metal box 41 moved to the filter cloth side moves to the anti-filter cloth side by supplying new sludge to the filter chamber 22.
[0036]
Next, a dehydrating and drying apparatus according to a third embodiment of the present invention will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A and FIG. 4B are cross-sectional views showing a dehydrating and drying unit according to the third embodiment of the present invention. Note that the configuration and operation that are not particularly described are the same as those in the first and second embodiments described above, and thus redundant description thereof is omitted. The dehydrating and drying apparatus according to the first and second embodiments described above is a so-called dual-type apparatus in which independent filter chambers are formed inside a plurality of dehydrating and drying sections, but the dehydrating apparatus according to the present embodiment. The drying device is a so-called single-type device in which a filter chamber is formed by adjacent filter frames.
[0037]
In the present embodiment, the dehydrating and drying unit 50 includes a plurality of filter frames 51, filter cloths 23 disposed on both sides of the filter frame 51, and a metal box (metal member) 41 held by the filter frame 51. Yes. A filter chamber 22 is formed by a pair of filter cloths 23 between adjacent filter frames 51. Each filter frame 51 is formed with through holes 51a having a rectangular cross section, and two metal boxes 41 are slidably accommodated in these through holes 51a. The upper part of the filter cloth 23 is fixed to the filter frame 51 by a fixing member 53. The upper part of each filter frame 51 and the fixing member 53 are integrally formed with a communication hole 54 for guiding sludge to the filter chamber 22. A sludge supply port 53 a communicating with the filter chamber 22 is formed at the lower part of the pair of fixing members 53 that are in contact with each other.
[0038]
The two metal boxes 41 accommodated in the filter frame 51 are arranged so that the openings face each other. The fluid chamber 30 is formed by the through hole 51 a of the filter frame 51 and the two metal boxes 41. A lower fluid hole 51c communicating with the fluid chamber 30 is formed in the lower part of the filter frame 51, and the lower fluid hole 51c is connected to the hot water header 17A (see FIG. 1). The hot water supplied to the fluid chamber 30 through the lower fluid hole 51c is supplied to the hot water header 17B (see FIG. 1) through an upper fluid hole (not shown). A filtrate discharge hole 20 that communicates with a gap G between the filter cloth 23 and the side portion 41 a of the metal box 41 is formed in the lower portion of the filter frame 51.
[0039]
As shown in FIG. 4B, when hot water is supplied to the fluid chamber 30, the metal box 41 receives the pressure of the hot water and moves to the filter cloth side, thereby reducing the volume of the filter chamber 22. As the metal box 41 moves, the sludge S in the filter chamber 22 is pressed by the filter cloth 23, whereby water contained in the sludge S flows into the gap G between the filter cloth 23 and the metal box 41. In this way, the dewatering of the sludge S is performed. Moreover, the heat of warm water is transmitted to the sludge S in the filter chamber 22 through the metal box 41 and the filter cloth 23, and the sludge S is heated. As a result, the water contained in the sludge S evaporates and the sludge S becomes cake-like. Further, the gap G between the metal box 41 and the filter cloth 23 is evacuated by the vacuum pump 3 (see FIG. 1), whereby the water contained in the sludge S (cake) in the filter chamber 22 is further evaporated, and the sludge S dehydration drying is promoted. In addition, after completion | finish of a dehydration drying process, the dehydration drying part 50 is opened from the site | part shown by the arrow C of FIG.4 (b), and the dewatered sludge (cake) is discharged | emitted from the filter chamber 22. FIG.
[0040]
【The invention's effect】
As described above, according to the present invention, the heat of the fluid supplied into the fluid chamber can be transferred to the hydrated material in the filter chamber through the metal member with high efficiency. Therefore, heat can be applied to the hydrated product to evaporate water in the hydrated product, and the hydrated product can be effectively dried. As a result, the sludge can be dehydrated and dried in a short time with a single device without newly adding a large-scale device such as a dryer.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of a dehydration drying apparatus according to a first embodiment of the present invention.
2 (a) and 2 (b) are cross-sectional views showing the dehydrating and drying unit shown in FIG.
3 (a) and 3 (b) are cross-sectional views showing a dehydrating and drying unit according to a second embodiment of the present invention.
FIGS. 4 (a) and 4 (b) are cross-sectional views showing a dehydrating and drying unit according to a third embodiment of the present invention.
[Explanation of symbols]
1, 40, 50 Dewatering and drying section 2 Hot water boiler 3 Vacuum pump 4 Sludge supply line 5 Sludge supply pump 6 Blow line 7 Hot water circulation line 8 Hot water circulation pump 9 Back pressure valve 10 Filtrate discharge line 11 Vacuum exhaust line 12 Drain pot 14 Sludge Discharge line 15 Communication pipe 16 Tightening device 17A, 17B Hot water header 20 Filtrate discharge hole 22 Filter chamber 23 Filter cloth 24 Hollow body 25 Metal plate (metal member)
26 Filter frame 27 Bellows (expandable part)
28 Protrusion 30 Fluid chamber 41 Metal box (metal member)
42 Seal member 43, 53 Fixing member 51 Filter frame 54 Communication hole G Gap S Sludge V1, V2, V3, V4, V5 On-off valve

Claims (4)

A filter cloth forming a filter chamber;
A metal member disposed adjacent to the filter cloth and movable to the filter cloth side;
A filter frame for holding the metal member;
A fluid supply mechanism for supplying a high-temperature fluid to a fluid chamber formed by the metal member and the filter frame;
The metal member is formed with a bellows extending along a peripheral portion thereof,
The bellows is composed of a part of the metal member,
The metal member is fixed to the filter frame via the bellows,
When the fluid is supplied to the fluid chamber, the metal member presses the filter cloth against the hydrated matter in the filter chamber. A filter cloth forming a filter chamber;
  A metal member disposed adjacent to the filter cloth and movable to the filter cloth side;
  A filter frame for holding the metal member;
  A fluid supply mechanism for supplying a high-temperature fluid to a fluid chamber formed by the metal member and the filter frame;
  The metal member is slidably accommodated on the filter cloth side and the anti-filter cloth side in the filter frame,
  When the fluid is supplied to the fluid chamber, the metal member presses the filter cloth against the hydrated matter in the filter chamber. Dewatering drying apparatus according to claim 1 or 2, characterized in that it comprises the further vacuum generating mechanism for decompressing the gap formed between the filter cloth and the metal member. The dehydration drying apparatus according to claim 1 or 2, wherein a plurality of protrusions made of metal are provided on a surface of the metal member on the filter cloth side.

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