JP2016182571A - Filtration module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily cleanable long service life filtration module having high treatment efficiency while restraining manufacturing cost.SOLUTION: A filtration element 10 in this embodiment forms a flow hole 13 in the axial direction for making a treatment object fluid flow along an inner peripheral surface 15, and the treatment object fluid is composed of a porous body separated or condensed between the inner peripheral surface 15 and an outer peripheral surface 17, and a projection part 19 for guiding the treatment object fluid to the outside from a close contact area formed between the outer peripheral surface 17 of the adjacent other filtration element 10 and itself, is formed in a spiral shape on the outer peripheral surface 17 of the filtration element 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a filtration module for separating or concentrating a fluid to be treated.

  Conventionally, porous filters such as ceramics have been used in apparatuses for treating various fluids such as water purification apparatuses and exhaust gas purification apparatuses.

  For example, Patent Document 1 discloses a ceramic porous filter. Specifically, a filtrate conduit comprising a plurality of chambers extending in the longitudinal direction of the monolith and slots extending transversely from these chambers to the filtrate collection region is provided for easily draining the filtrate. It is disclosed.

  In addition, Patent Document 2 specifically discloses a monolithic ceramic filter, which is a ceramic filter of a honeycomb structure, which suppresses an increase in flow resistance of the filtrate while increasing a filtration area. Has been. Specifically, it is disclosed that by forming a groove-shaped recess on the outer wall, the flow distance through which the filtrate that has permeated the filtration membrane flows in the partition wall and is discharged from the outer wall to the outside of the filter is disclosed. ing.

Japanese Patent Publication No. 6-16819 JP-A-6-99039

  However, although the filtration elements of Patent Documents 1 and 2 reduce the flow resistance of the filtrate due to the slot or groove-like recess, the flow resistance of the filtrate is still large and the filtration speed is limited. There is.

  In addition, when a large-diameter filtration element is configured to increase the amount of treatment as in Patent Documents 1 and 2, the amount of water to be filtered is different between the central portion where the filtration resistance is large and the small peripheral portion, compared to the central portion. The clogging of the membrane proceeds quickly in the peripheral portion where the amount of permeated water is large. In order to eliminate the clogging caused by this filtration, reverse cleaning treatment is performed, but the central part with high filtration resistance is not effective in reverse cleaning, and the peripheral part is clogged so severely that it cannot be easily cleaned. There is.

  In addition, when a large-diameter filter element is integrally formed by extrusion, cracks are likely to occur because the drying speed of the material is greatly different between the central portion and the peripheral portion. For this reason, facilities such as freeze-drying and forced circulation drying with hot air are required, and there is a problem that manufacturing costs are increased.

  The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a filtration module that has high processing efficiency while suppressing manufacturing cost, can be easily cleaned, and has a long service life. is there.

  In order to solve the above problems, a filtration module of the present invention is a filtration module for treating a fluid to be treated, and a plurality of cylindrical filtration elements made of a porous body are disposed adjacent to each other, and The filtration element group includes a plurality of filtration elements arranged so that a space surrounded by an outer peripheral surface of the filtration element is formed, and the filtration element includes: The outer peripheral surface is provided with at least one of a first concave portion or a first convex portion for communicating the space with the outside of the filtration element group.

  According to the said structure, since the filtration element is cylindrical, filtration flow resistance can be restrained small. In addition, since the plurality of cylindrical filtration elements are arranged adjacent to each other, the manufacturing cost can be reduced as compared with the case where the large-diameter filtration elements are integrally extruded. Further, since the space formed by surrounding the filtration elements communicates with the outside through at least one of the first concave portion or the first convex portion, the fluid to be processed can be discharged from the space to the outside.

  In addition, since the fluid to be treated can be easily discharged from the space, the fluid to be treated is uniformly separated or concentrated from the inner peripheral surface to the outer peripheral surface of the filtration element so that high processing efficiency can be obtained. Become.

  Further, since the flow rate of the fluid to be processed flowing from the inner peripheral surface to the outer peripheral surface of the filtration element is not greatly biased, clogging of the pores can be progressed uniformly. Further, when backwashing is performed, clogging of the pores is uniformly eliminated, and it can be used stably over a long period of time.

  Therefore, it is possible to provide a filtration module that has high processing efficiency while suppressing the manufacturing cost, can be easily cleaned, and has a long life.

  Moreover, the said filtration element is equipped with the said 1st convex part formed in the spiral.

  For example, the close contact may be suppressed by sandwiching a spacer between the filtration elements, but according to the above configuration, a spiral protrusion can be used instead of the spacer. Thereby, the manufacturing cost can be suppressed.

  The filtration element includes at least one of the second concave portion or the second convex portion on the inner peripheral surface.

  According to the above configuration, since the surface area of the inner peripheral surface increases, the processing amount of the fluid to be processed can be increased.

  The present invention provides high processing efficiency while suppressing the manufacturing cost, and is advantageous in that it can be easily cleaned and can have a long service life.

It is a figure which shows an example of the filtration module in embodiment of this invention. It is a figure which shows an example of the filtration element in embodiment of this invention. It is sectional drawing which shows an example of the filtration element group in embodiment of this invention. It is sectional drawing which shows an example of the filtration element group in embodiment of this invention. It is a figure which shows an example of the filtration element in embodiment of this invention. It is a figure which shows the comparative example of a filtration element. It is a figure which shows an example of the filtration element in a modification. It is a figure which shows an example of the filtration element in a modification. It is a figure which shows an example of the metal mold | die used in order to manufacture the filtration element which has a projection part in embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  1A and 1B are diagrams illustrating an example of a filtration module according to an embodiment of the present invention. Fig.1 (a) shows the cross section of a filtration module, FIG.1 (b) shows the side surface of a filtration module. The filtration module 100 is a device that purifies various fluids such as water and exhaust gas. As shown in FIGS. 1A and 1B, the filtration module 100 includes a pair of disk-shaped support members 5 and 7 and a plurality of filtration element groups 3 whose both ends are fixedly supported by the support members 5 and 7. It consists of.

  The filtration element group 3 is configured to have a triangular cross section by arranging a plurality of cylindrical filtration elements 10 in parallel. In addition, each filtration element group 3 is fixed in an annular shape by facing portions corresponding to the apexes of the triangle, and here, the filtration module 100 is configured so that the cross-section has a hexagonal shape as a whole. That is, a partition wall that is partitioned in a shape corresponding to the cross section of the filtration element group 3 is provided, and is inserted into each partition so that one vertex of the filtration element group 3 faces each other, and is configured in a hexagonal shape as a whole.

  In addition, both ends of the filtration element group 3 (parts surrounded by the support members 5 and 7 are formed so that a space is evenly formed between the sections of the support portions 11 and 12 and the peripheral surface of the filtration element 10. ), A resin such as an epoxy curing agent is filled between the spaces between the filtration elements 10 and between the partition walls and the filtration elements 10. In the following, a case where the filtration element 10 is cylindrical will be described as an example. However, the shape is not limited to a cylinder as long as it is cylindrical.

  FIG. 2 is a diagram illustrating an example of a filtration element in the embodiment of the present invention. As shown in FIG. 2, the cylindrical filtration element 10 has a through hole 13 through which a fluid to be treated flows into the inside along the inner peripheral surface 15 in the axial direction to form a porous body. Composed of ceramics. As a result, when the fluid to be treated flows from the flow hole 13 of the filtration element 10, the fluid to be treated is separated or concentrated between the inner peripheral surface 15 and the outer peripheral surface 17.

  3 and 4 are cross-sectional views showing an example of the filtration element group in the embodiment of the present invention. FIG. 3 shows a case where the filtration element group 3 is constituted by six filtration elements 10, and FIG. 4 shows a case where the filtration element group 3 is constituted by 16 filtration elements 10.

  As shown in FIGS. 3 and 4, in the filtration element group 3, a plurality of filtration elements 10 are arranged adjacent to each other so that a space 9 surrounded by the outer peripheral surface 17 of the filtration element 10 is formed. Many spaces 9 are formed near the center of the filtration element group 3.

  For example, when the filtration element group is configured by a cylindrical filtration element 30 with no irregularities formed on the outer peripheral surface 17 as shown in FIG. 6, the filtration elements 30 are in line contact with each other. A closed space is formed by close contact. Since the fluid to be processed does not easily flow out from the closed space, there is a problem that the amount of the fluid to be processed is reduced. In addition, while the fluid to be treated is difficult to flow out from the vicinity of the center of the filtration element group having many closed spaces, the fluid to be treated is likely to flow out in the vicinity of the filtration element group, and therefore, clogging of pores is likely to occur. There is also a problem.

  In the present invention, a device is devised to reduce the closeness of the filtration elements. Specifically, the outer peripheral surface 17 is provided with at least one of a concave portion or a convex portion for communicating the space 9 formed by adjoining the outer peripheral surfaces 17 of the filtration elements and the outside of the filtration element group 3.

  For example, as shown in FIG. 2, one or more protrusions (first protrusions) 19 may be provided on the outer peripheral surface 17 of the filtration element 10 in a spiral shape. Moreover, it replaces with the projection part 19 or in addition to the projection part 19, the groove | channel (1st recessed part) may be formed helically. Further, as shown in FIG. 5, grooves 21 may be formed in the circumferential direction of the outer peripheral surface 17 of the filtration element 20. As a result, when the filtration elements are arranged adjacent to each other, they are in point contact with each other, so that the close contact can be suppressed as compared with the case where the filtration element 30 shown in FIG. 6 is used. As a result, the fluid to be processed can be discharged from the space 9 to the outside.

  In addition, since the fluid to be treated can be easily flown out in the space 9 as described above, the fluid to be treated is uniformly separated or concentrated from the inner peripheral surface 15 to the outer peripheral surface 17 of the filtration element. Efficiency can be obtained.

  Further, since the flow rate of the fluid to be processed flowing from the inner peripheral surface 15 to the outer peripheral surface 17 of the filtration element does not greatly deviate as described above, clogging of the pores can be progressed uniformly. Further, when backwashing is performed, clogging of the pores is uniformly eliminated, and it can be used stably over a long period of time.

  As described above, in order to arrange the filtration elements adjacent to each other, as shown in FIG. 3, it is possible to design and arrange the entire filtration element 10 so as to contact the partition wall surrounding the filtration element group 3. Although, for example, as shown in FIG. 4, a part of the filtration elements 10 are surrounded by other filtration elements 10, even in a configuration in which more filtration elements 10 are bundled, the discharge path according to the present invention is secured. Can do. Furthermore, since the freedom degree of the shape to bundle is high, it becomes possible to perform more efficient design and arrangement | positioning.

  In addition, when the filtration element group 3 is comprised by the filtration element 30 shown in FIG. 6, in order to reduce mutual closeness, it is assumed that the device which sandwiches a spacer member is assumed, but the filtration element 10 shown in FIG. In the case of the filtration element group 3 constituted by the above, since the protrusion 19 serves as a spacer, the spacer becomes unnecessary.

  Here, the manufacturing method of the filtration element mentioned above is demonstrated. As the filtration element, fluid ceramics obtained by adding water, an organic binder, or the like to mullite ceramics can be used. Here, the filtration element 10 is extruded while being twisted by using an extrusion molding machine having a mold having a concave hole at one outer side facing an annular hole as shown in FIG. A cylindrical member having a spiral protrusion is obtained by molding, and can be manufactured by firing after a drying step. Also, it may be a mold having concave or convex shapes at two or more locations, but when manufactured by extrusion, if the cross-sectional shape is not vertical and / or symmetric, the cross-sectional area of the concave-convex shape Preferably does not exceed 5% of the total cross-sectional area of the filter element. If it exceeds 5%, there will be a difference in extrusion pressure, which may result in uneven thickness. In addition to the above, ceramics that can form a porous body such as alumina and collage light can be used as the ceramic material.

  In addition, although the case where a protrusion part was manufactured by extrusion molding was demonstrated here as an example, you may provide a protrusion part in the cylindrical filtration element by which the unevenness | corrugation is not formed in the outer peripheral surface by processing. From the viewpoint of production cost, it is preferably provided by extrusion.

  In addition, when forming a groove on the outer peripheral surface, it may be extruded using an extruder having a mold facing the annular hole and having a convex shape on the inside, or after being extruded into a cylindrical shape. Alternatively, processing may be performed to form a groove having a desired shape.

<Modification>
The filter element in the modified example has an inner peripheral surface formed with irregularities. Specifically, as in the filtration element 40 shown in FIG. 7A (the outer peripheral surface is the same as in FIGS. 2 and 5 but not shown here), the inner peripheral surface has a wave shape ( 2nd convex part, 2nd recessed part) 41 may be formed, and the filtration shown by FIG.7 (b) (The outer peripheral surface is the same as that of FIG.2,5 but is not shown in figure here.) Like the element 50, the rectangular uneven | corrugated shape 51 which consists of a convex part (2nd convex part) 51a and a recessed part (2nd recessed part) 51b may be formed in an internal peripheral surface. Moreover, the convex part 51a or the recessed part 51b may be formed not only in the structure by which the convex part 51a and the recessed part 51b are arrange | positioned equally like FIG.7 (b) but only in a part of internal peripheral surface.

  By providing the inner peripheral surface unevenness in a spiral shape like the outer peripheral surface, not only can the contact area be increased, but also the turbulent flow is generated in the fluid to be treated, so that the filtration speed is improved and the inner surface Since the fluid to be processed can be distributed throughout, it is possible to eliminate the unevenness of the location where the fluid to be processed flows from the inner peripheral surface.

  Furthermore, it is set as the waveform 61a, 61b of the outer peripheral surface 61 like the filtration element 60 shown by FIG. 8, and the to-be-processed which passes the filtration element 60 by making the inner peripheral surface 63 into the waveform 63a, 63b similarly to it. The amount of fluid supply and drainage can be made substantially the same, and more efficient filtration can be achieved. Moreover, the processing amount of the fluid to be processed can be increased by these configurations.

  As mentioned above, although the filtration element arrange | positioned at a filtration module was demonstrated, you may arrange | position the thing of a respectively different shape for these filtration elements arrange | positioned adjacently. When the shapes of adjacent filtration elements are different, formation of a gap between the filtration elements is facilitated, and more discharge paths are formed.

3 Over-element group 5, 7 Support member 9 Space 10, 20, 30, 40, 50 Filtration element 13 Through hole 15 Inner peripheral surface 17 Outer peripheral surface 19 Projection (first convex portion)
41 Wave shape (second concave part, second convex part)
51 Rectangular uneven shape (second concave portion, second convex portion)
100 Filtration module

Claims (3)

A filtration module for treating a fluid to be treated,
A plurality of cylindrical filtration elements made of a porous body are arranged adjacent to each other, and include a filtration element group in which they are integrated.
In the filtration element group, the plurality of filtration elements are arranged so that a space surrounded by the outer peripheral surface of the filtration element is formed,
The filtration module includes at least one of a first concave portion or a first convex portion on the outer peripheral surface for communicating the space and the outside of the filtration element group.   The filtration module according to claim 1, wherein the filtration element includes the first convex portion formed in a spiral shape.   The filtration module according to claim 1, wherein the filtration element includes at least one of a second concave portion or a second convex portion on an inner peripheral surface.

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