JP4290584B2 - Filtration filter and filtration device - Google Patents

Description

The present invention relates to a filtration treatment technology, in particular, it relates to a filtration filter and the filtration device is suitable for filtration of the primary system coolant of a pressurized water nuclear power plant.

The primary cooling water filtration device of the pressurized water nuclear power plant captures particulate components in the primary cooling water, suppresses the dose increase of the system, purifies the shaft seal water of the primary cooling water pump, and the primary system configuration. It is used for the purpose of preventing adhesion of corrosion products to the surface of members. And the filtration filter loaded in the said filtration apparatus is replaced | exchanged when the filtration pressure loss rises gradually by catching the fine particle component in system | strain water, and reaches the preset differential pressure | pressure, and used filtration filter Is discarded as radioactive waste. As such a filtration filter, the thing similar to the filtration filter disclosed by patent document 1 and patent document 2 is used, for example.
JP 52-37272 A JP-A-8-71316

The double-cylinder filtration filter disclosed in Patent Document 1 is filled with a filtration membrane structure between a metal porous plate constituting an outer cylinder and an inner cylinder, and filtered by allowing raw water to pass from the outside to the inside. However, when the pressure loss increases, it is usual to disassemble the outer cylinder and the inner cylinder, clean the filtration membrane structure, and assemble again for use. However, in order to decompose, it is necessary to take out the entire filtration filter from the filtration tower. Therefore, even when a decomposable filtration filter is used, contact with an outer cylinder or the like constituting the filtration filter is indispensable for decomposing, and the disassembling work time is also considerable. For this reason, when it is used in the filtration tower of the primary cooling water filtration device of a pressurized water nuclear power plant, even if such a degradable filtration filter is used, radioactive contamination of workers and the surrounding environment Therefore, it is necessary to dispose of the filtration filter itself without disassembling it. For this reason, in the pressurized water nuclear power plant, volume reduction of the filtration filter discarded is a problem.
The filtration filter disclosed in Patent Document 2 can replace the filter medium by fixing the cylindrical filter medium (filtration membrane structure) to the support frame via a ring-shaped member and removing the ring-shaped member. It has a simple structure. However, the ring-shaped member is not connected to the filter medium, but is an independent member. If the ring-shaped member is removed in the filtration tower, it is difficult to extract the filter medium. Therefore, in Patent Document 2, it is assumed that the replacement work of the filter medium is performed after the entire filter including the filter medium, the support frame, and the ring-shaped member is pulled out from the filter tower and then decomposed. For this reason, as in the case of the above-mentioned Patent Document 1, there is a problem in the speed of disassembly and replacement work, and only the filter medium can be replaced in the filtration filter of the primary cooling water filtration device of the pressurized water nuclear power plant. It is insufficient for use as a structure.

  In addition, when performing filter filter replacement work or disposal work, it is necessary to pay sufficient attention to prevent environmental contamination by radioactive particles trapped in the filter membrane structure and to ensure the safety of workers. The preparation of work for radiation protection requires a great deal of labor, which causes a reduction in work efficiency.

The present invention has been made in view of the above points, and by making it possible to easily separate the filtration membrane structure from the support frame constituting the filtration filter, it is possible to speed up the disassembly and replacement work. It is an object of the present invention to provide a filtration filter that can reduce the volume of waste disposal and is suitable for the treatment of primary cooling water of a pressurized water nuclear power plant. In addition, the present invention provides a filtration device that can reduce the contamination of the surrounding environment and work environment during replacement work and disposal work of the filter, simplify work preparation for radiation protection, and can expect improvement in work efficiency. The task is to do.

In order to solve the above-mentioned problem, in the present invention according to claim 1, a cylindrical filtration membrane structure, a lattice-shaped inner cylinder member positioned inside the cylindrical filtration membrane structure, and a lattice shape positioned outside outer tubular member, becomes a support frame member to have a lower support member positioned above the support member and a lower position to the upper, in the filtration column is fixed arranged to communicate with the discharge portion of the treated water The filtration membrane structure is connected and loaded only between an upper support member between the lattice-like inner cylinder member and the lattice-like outer cylinder member of the support frame, and the inside of the lattice-like structure. The upper support member and the filtration membrane structure are separated from the lattice inner cylinder member, the lattice outer cylinder member, and the lower support member with the cylindrical member, the lattice outer cylinder member, and the lower support member fixed in the filtration tower. And a filtration filter characterized by being detachable.
According to a second aspect of the present invention, there is provided a seal member that can be in close contact with the lower support member at the lower part of the cylindrical filtration membrane structure when mounted on the support frame. Provides a filtration filter.
According to a third aspect of the present invention, there is provided the filtration filter according to the first or second aspect, wherein the filtration filter is used for a filtration treatment of primary cooling water of a pressurized water nuclear power plant.
In the present invention of claim 4, a filtration filter comprising a cylindrical filtration membrane structure held by a support frame, the lower end opening of the inner peripheral hollow portion is closed, and disposed in the filtration tower; Between the outer periphery of the filtration filter and the inner periphery of the filtration tower, the outer periphery of the filtration filter is fixedly disposed, and the water to be treated introduced into the filtration tower is located above the filtration membrane structure, Guided to the inlet formed in the upper support member constituting the support frame, introduced into the inner peripheral hollow portion of the filtration membrane structure through the inlet, and treated water from the inside to the outside of the filtration membrane structure And a partition member that guides treated water to a discharge part through a treated water passage gap formed between the filter membrane structure and the outer periphery of the filtration membrane structure, wherein the filtration filter support frame of grid-like inner cylinder located inside the filtration membrane structure of the cylindrical Wood, lattice-shaped barrel located outside member, it has a lower support member positioned above the support member and a lower position to the upper, the filtration membrane structure, lattice-shaped inner tube of the support frame The upper member is connected and loaded only between the upper support member and the lattice-shaped outer cylinder member, and the upper portion is fixed in the filtration tower while the lattice-shaped inner cylinder member, the lattice-shaped outer cylinder member and the lower support member are fixed in the filtration tower. Provided is a filtration device characterized in that the support member and the filtration membrane structure are detachable from the lattice-shaped inner cylinder member, the lattice-shaped outer cylinder member, and the lower support member.
In this invention of Claim 5 , while the said partition member is formed in a substantially cylindrical shape, it protrudes upwards from a bottom wall, The end wall part which obstruct | occludes the lower end opening part of the inner peripheral hollow part of a filtration filter, and a process 5. The filtration device according to claim 4, further comprising an inner tube portion including a peripheral wall portion having an opening communicating with the water discharge portion.
According to a sixth aspect of the present invention, there is provided the filtration apparatus according to the fourth or fifth aspect, which is used for the filtration treatment of the primary cooling water of a pressurized water nuclear power plant.

  In the filtration filter of the present invention, the filtration membrane structure is connected only to the upper support member of the support frame, and the filtration inner cylindrical member, the lattice outer cylinder member, and the lower support member are fixed in the filtration tower. The membrane structure can be detached from these and removed. Therefore, when the predetermined differential pressure is reached, the filtration membrane structure is removed by pulling out the upper support member, and then the new filtration membrane structure together with the upper support member is fixed in the filtration tower. By inserting between the cylindrical inner cylinder member and the lattice-shaped outer cylinder member, the replacement can be performed easily and quickly. Since the other structural members constituting the support frame excluding the upper support member can be used as they are, the cost of the filtration filter can be reduced and the radioactive waste capacity can be reduced. Moreover, by forming the upper support member from the same material as that of the filtration membrane structure, the upper support member can be quickly discarded in an integrated state without being separated. Furthermore, by using a combustible material as the filter membrane structure, it is preferable to further reduce the waste volume by using a combustible material as the upper support member in addition to the filter membrane structure. Can be realized.

The filtration device of the present invention has a configuration in which water to be treated is introduced into the inner peripheral hollow portion of the filtration membrane structure and filtered from the inside to the outside of the filtration membrane structure. For this reason, a lot of radioactive fine particles are trapped on the inner surface side of the filtration membrane structure, and radioactive contamination to the surrounding environment and the working environment at the time of replacement work and disposal work can be reduced. Accordingly, the preparation work for preventing the contamination of the surrounding environment and the like can be simplified, and the work efficiency is improved. In this case, when a filtration filter having a filtration membrane structure connected only to the upper support member of the support frame is used, the lattice inner cylinder member, the lattice outer cylinder member, and the lower support member are fixed in the filtration tower. In this state, the filtration membrane structure can be detached and attached from these, and the effects of reducing the cost of the filtration filter, reducing the volume of radioactive waste, and the like can be expected.

  Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. FIG.1 and FIG.2 is a figure which shows the filtration apparatus 100 using the filtration filter 10 concerning one Embodiment of this invention. The filtration device 100 is configured to include a filtration tower 110 including a substantially cylindrical body 120 and an upper lid 130 that opens and closes an upper opening of the body 120. The trunk portion 120 is provided with an introduction portion 121 for water to be treated and a discharge portion 122 for treated water that has been filtered. The discharge part 122 is formed in the bottom wall part 123 of the trunk | drum 120 in the substantially L-shaped cross section, and is provided with the discharge pipe part 122a which protrudes upwards from the upper surface of the bottom wall part 123. As shown in FIG. In addition, the formation position and structure of the introducing | transducing part 121 and the discharge part 122 are an example to the last, and are not limited to the aspect shown in figure.

  The filtration filter 10 is disposed in the filtration tower 110 such that the lower end opening is fitted and connected to the discharge pipe portion 122 a of the discharge portion 122. More specifically, the upper lid 130 of the filtration tower 110 is opened, the filtration filter 10 is inserted, the lower end opening is fitted into the discharge pipe portion 122a, and the upper lid 130 is closed. At this time, an elastic member 140 such as a coil spring is interposed between the upper support member 33 of the filtration filter 10 and the upper lid 130. Thereby, the pressing force of the elastic member 140 functions, and the filtration filter 10 is pressed and fixed in the filtration tower 110. Further, as will be described later, in the present invention, the filtration membrane structure 20 constituting the filtration filter 10 and the upper support member 33 of the support frame 30 have a structure that can be separated from the lattice-shaped inner cylinder member 31 and the like. By disposing the elastic member 140, the filtration membrane structure 20 is reliably loaded between the lattice-shaped inner cylinder member 31 and the lattice-shaped outer cylinder member 32. The elastic member 140 may be any member that performs such a function, and other metal springs or rubber may be used in addition to the coil spring. Further, one end of the elastic member 140 can be fixed to the inner surface of the upper lid 130 in advance in order to shorten the work time at the time of installation and facilitate the work. Moreover, it can replace with the elastic member 140, for example, can also be set as the structure which provides the flange part (not shown) which protrudes toward inner side in the filtration tower 110, for example, and fixes to this flange part. However, it is preferable to use the elastic member 140 as described above in consideration of the work time at the time of installation.

  The filtration filter 10 includes a filtration membrane structure 20 and a support frame 30. The filtration membrane structure 20 is a filter medium formed in a film shape, is processed into a pleat shape, and is formed in a cylindrical shape. The material is not limited. For example, a material formed from a silica-based material or a material formed from an organic polymer material such as polypropylene, polyethylene, or polyamide can be used. However, it is preferable to use a combustible material such as an organic polymer material for further volume reduction at the time of disposal. Moreover, as shown to FIG. 1 (a), (c), it is preferable that the cyclic | annular sealing member 21 is being fixed to the lower end of the filtration membrane structure 20. FIG. Thereby, the sealing member 21 is in close contact with the lower support member 34 only by inserting the filtration membrane structure 20 between the lattice-like inner cylinder member 31 and the lattice-like outer cylinder member 32, which will be described later, and the mounting operation can be facilitated. .

  The support frame 30 fulfills the function of maintaining the shape of the filtration membrane structure 20, and is a lattice-shaped inner cylinder member 31 located inside the filtration membrane structure 20 formed in a cylindrical shape, and located outside. It has a grid-like outer cylinder member 32, an upper support member 33 located on the upper side, and a lower support member 34 located on the lower side. That is, the filtration membrane structure 20 is loaded between the lattice-shaped inner cylinder member 31 and the lattice-shaped outer cylinder member 32 and is held by the support frame 30. Since the support frame 30 fulfills the function of maintaining the shape of the filtration membrane structure 20, particularly the lengthwise dimension, at least the lattice-shaped inner cylinder member 31 and the lattice-shaped outer cylinder member 32 are formed of a metal material or the like. The Of course, the material is not limited to a metal material as long as it has a predetermined strength.

  The lattice-shaped inner cylinder member 31 and the lattice-shaped outer cylinder member 32 are formed with a large number of holes through which the water to be treated can pass through the filtration membrane structure 20 in the thickness direction from the outer periphery toward the inner periphery. It should be noted that the phrase “lattice shape” does not mean that the hole shape is limited, but of course, as long as the liquid can pass therethrough, it means that holes having various shapes and sizes are included. In addition to the shape, for example, a mesh shape, a slit (long hole) shape, a porous shape, and the like can be used. Of course, the basis weight in the case of the mesh shape and the hole shape in the case of the porous shape are not limited.

  The upper support member 33 is formed in a substantially disk shape as shown in FIGS. 1A and 1B, and the upper portion of the filtration membrane structure 20 is connected to a groove portion 33a formed in an annular shape on the lower surface. In addition, a spring receiving portion 33b that receives an elastic member 140 such as a coil spring is formed at a substantially central portion of the upper surface. Since the upper support member 33 is connected and integrated with the filtration membrane structure 20 in this manner, the upper support member 33 is connected to the upper edge 31a of the lattice-shaped inner cylinder member 31 and the lattice shape as shown in FIG. The filtration membrane structure 20 can be extracted by pulling away from the upper edge 32a of the outer cylinder member 32. The upper support member 33 can be removed from the filtration membrane structure 20 and reused after being removed, but the upper support member 33 is also disposed of as it is in order to perform replacement work and disposal work quickly. It is preferable to do. Further, when the upper support member 33 is formed of the same material as the filtration membrane structure 20, it can be discarded together with the filtration membrane structure 20 at the time of disposal. For example, when the upper support member 33 and the filtration membrane structure 20 are both formed from a combustible material, they can be incinerated together.

  The lower support member 34 is formed of, for example, a metal material and closes the annular lower end portion between the lattice-shaped inner cylinder member 31 and the lattice-shaped outer cylinder member 32. The lower support member 34 can be formed integrally with either or both of the lattice-shaped inner cylinder member 31 and the lattice-shaped outer cylinder member 32. Further, a seal member 34 a such as an O-ring is provided on the lower surface of the lower support member 34 so as to be in close contact with the outer surface of the discharge pipe portion 122 a constituting the treated water discharge portion 122. The seal member 34a prevents the treated water from directly entering the discharge part 122 without being filtered. Depending on the relationship between the inner diameter of the filtration tower 110 and the outer diameter of the filtration filter 10, for example, filtration A seal member (not shown) such as an O-ring may be disposed between the inner surface of the body 120 of the tower 110 and the outer surface of the lattice-shaped outer cylinder member 32 of the filtration filter 10.

  Next, the effect | action of the filtration apparatus 100 is demonstrated. The filtration device 100 is disposed for filtering primary cooling water of a pressurized water nuclear power plant. When primary cooling water which is to-be-treated water is introduced into the filtration tower 110 from the introduction part 121, it penetrates from the outer surface to the inner surface of the filtration membrane structure 20, and is filtered. The filtered treated water passes through the inner peripheral hollow portion of the filtration filter 10 and is discharged from the discharge portion 122 through the discharge pipe portion 122a. Such a process is repeated in a normal filtration process, but when a predetermined differential pressure is reached, the filtration membrane structure 20 is replaced.

  In the replacement operation, first, the upper lid 130 of the filtration tower 110 is opened. Thereby, the pressing force of the elastic member 140 disposed between the upper support member 33 of the support frame 30 and the upper lid 130 is released. Next, the upper support member 33 of the support frame 30 is pulled out. Since the filtration membrane structure 20 is connected to the upper support member 33, the filtration membrane structure 20 is pulled out of the lattice inner cylinder member 31 and the lattice outer cylinder of the support frame 30 by pulling out the upper support member 33. The member 32 and the lower support member 34 are pulled out while remaining in the filtration tower 110. The filtration membrane structure 20 pulled out together with the upper support member 33 is discarded as it is. At this time, according to the present embodiment, since the entire filtration filter including the filtration membrane structure and the support frame is not discarded as in the prior art, the volume of waste can be reduced. Moreover, since only the upper support member 33 and the filtration membrane structure 20 integrated with the upper support member 33 are replaced, the replacement cost and the operation cost can be reduced. The new filtration membrane structure 20 for replacement is inserted between the grid-like inner cylinder member 31 and the grid-like outer cylinder member 32 that are fixed in the filtration tower 110, and the upper lid 130 is closed. The elastic member 140 interposed between the upper support member 33 and the upper lid 130 connected to the body 20 is fixed and disposed in the filtration tower 110 again.

  FIG. 3 is a diagram showing a filtration device 100 according to another embodiment of the present invention in which the flow path of the water to be treated with respect to the filtration filter 10 is changed. In addition, about the same member as the said embodiment, it shows with the same code | symbol.

  In the present embodiment, the partition member 200 is disposed between the outer periphery of the filtration filter 10 and the inner periphery of the filtration tower 110. The partition member 200 surrounds the outer periphery of the filtration filter 10 and is formed in a substantially cylindrical shape having a length and a diameter that can form a treated water passage gap 210 between the outer periphery of the filtration filter 10. Further, the partition member 200 of the present embodiment includes a bottom wall 220 protruding in a flange shape on the inner side at the lower end edge, and an inner cylinder portion 230 that rises upward from the inner peripheral edge of the bottom wall 220. . The inner cylinder part 230 has an end wall part 231 having a diameter capable of closing the lower end opening part of the inner peripheral hollow part of the filtration filter 10, and the peripheral wall part 232 has an opening part 232a communicating with the discharge pipe part 122a. Is formed (see FIG. 3C).

  The partition member 200 having such a configuration is disposed by fitting the inner tube portion 230 to the discharge pipe portion 122a, and the upper end portion 240 is disposed in close contact with the upper support member 33 of the filtration filter 10 via the seal member 240a. (See FIGS. 3B and 3C). In addition, it is necessary to prevent the water to be treated from directly entering the discharge pipe portion 122a without being treated. In this embodiment, the bottom wall 220 of the partition wall member 200 and the top surface of the bottom wall portion 123 of the filtration tower 110 The seal member 220a is loaded in between. The arrangement position of the seal member 220a is not limited. For example, the seal member 220a may be provided between the peripheral wall portion 232 of the inner cylinder portion 230 and the discharge pipe portion 122a.

  Although the structure of the filtration filter 10 is substantially the same as that of the above embodiment, in order to introduce the water to be treated into the inner peripheral hollow part of the filtration filter 10, as the upper support member 33, What formed the inflow port 33c is used.

  According to the present embodiment, when the primary cooling water in the pressurized water nuclear power plant, which is the water to be treated, is introduced into the filtration tower 110 from the introduction part 121, as shown by the arrows in FIG. It contacts the outer surface of 200 and is guided upward in the filtration tower 110. The treated water guided upward is introduced into the inner peripheral hollow portion of the filtration filter 10 from the inlet 33c provided in the upper support member 33, and is passed from the inner surface to the outer surface of the filtration membrane structure 20 to be filtered. Is done. The treated water that has flowed out to the outer surface of the filtration filter 10 contacts the inner surface of the partition wall member 200, travels downward through the treated water passage gap 210, and is formed in the peripheral wall portion 232 of the inner cylinder portion 230 of the partition wall member 200. The gas is discharged from 232a to the discharge pipe portion 122a.

  When the predetermined differential pressure is reached by repeating the filtration process in this manner, the upper support member 33 and the filtration membrane structure 20 are replaced with the lattice-shaped inner cylinder member 31 and the lattice exactly as in the above embodiment. The outer cylindrical member 32 and the like are withdrawn while remaining in the filtration tower 110, and replacement work is performed. At this time, according to the present embodiment, the primary cooling water that is the water to be treated is treated by passing the water from the inner surface to the outer surface of the filtration membrane structure 20, so that the captured radioactive fine particles are filtered. It concentrates on the inner surface side of the structure 20. For this reason, compared with the case where the to-be-processed water is penetrated from the outer surface to the inner surface of the filtration membrane structure 20, it is possible to reduce the spread of radioactive contamination to the surrounding environment and work environment at the time of replacement work, and to prevent contamination. Contribute to the simplification of preparation work and improvement of work efficiency.

  Also in this embodiment, it is preferable for the filtration filter 10 to have a configuration in which only the filtration membrane structure 20 can be replaced together with the upper support member 33 in order to reduce the volume of waste. However, the partition member 200 is used even when a filtration filter similar to the conventional filter, that is, a filtration filter that cannot separate the filtration membrane structure from the grid-like inner cylinder member and the grid-like outer cylinder member that constitute the support frame is used. Therefore, it is possible to reduce the radioactive contamination during the replacement work.

  Moreover, in this embodiment, it uses as a guide member which introduce | transduces the flow path of the primary system cooling water in the pressurized water nuclear power plant which is to-be-processed water into the inner peripheral hollow part of the filtration filter 10 using the partition member 200. However, as long as the water to be treated can be guided so as to penetrate from the inner surface to the outer surface of the filtration filter 10, other structures can be adopted as the guide member. However, since it is very easily attached to the existing filtration tower 110 and does not interfere with the drawing operation of the filtration membrane structure 20, the partition wall having a substantially cylindrical structure surrounding the filtration filter 10 as in this embodiment. It is preferable to use the member 200.

Fig.1 (a) is a figure which shows the whole structure of the filtration apparatus using the filtration filter which concerns on one Embodiment of this invention, FIG.1 (b) is the A section enlarged view of Fig.1 (a). FIG. 1 (c) is an enlarged view of part B of FIG. 1 (a). FIG. 2 is a diagram for explaining a filtration filter replacement work process according to the embodiment. FIG. 3 (a) is a diagram showing the overall structure of a filtration device according to another embodiment of the present invention, FIG. 3 (b) is an enlarged view of part C of FIG. 3 (a), and FIG. c) is an enlarged view of a portion D in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Filtration filter 20 Filtration membrane structure 30 Support frame 31 Lattice-like inner cylinder member 32 Lattice-like outer cylinder member 33 Upper support member 33c Inlet 34 Lower support member 100 Filtration apparatus 110 Filtration tower 120 Trunk part 121 Introducing part 122 Discharge part 123 bottom wall part 200 partition member 230 inner cylinder part 231 end wall part 232 peripheral wall part

Claims (6)

A cylindrical filtration membrane structure;
Support frame for chromatic grid-like inner cylinder member positioned inside the filtration membrane structure of the cylindrical grid-like outer casing member located outside the lower support member positioned above the support member and a lower position to the upper it comprises a <br/> the body, in the filtration tower, a filtration filter which is fixed arranged to communicate with the discharge portion of the treated water,
The filtration membrane structure is connected and loaded only between the upper support member between the lattice-like inner cylinder member and the lattice-like outer cylinder member of the support frame, and the lattice-like inner cylinder member and the lattice- like outer cylinder With the member and the lower support member fixed in the filtration tower, the upper support member and the filtration membrane structure can be detached from the grid-like inner cylinder member, the grid-like outer cylinder member, and the lower support member and detachable. The filtration filter which is characterized.   The filtration filter according to claim 1, further comprising a seal member that can be in close contact with the lower support member when the cylindrical filter membrane structure is mounted on the support frame.   The filtration filter according to claim 1 or 2, wherein the filtration filter is used for filtration treatment of primary cooling water of a pressurized water nuclear power plant. A filtration filter provided with a cylindrical filtration membrane structure held by a support frame, the lower end opening of the inner peripheral hollow portion being closed and disposed in the filtration tower;
Between the outer periphery of the filtration filter and the inner periphery of the filtration tower, the outer periphery of the filtration filter is fixedly disposed, and the water to be treated introduced into the filtration tower is located above the filtration membrane structure, Guided to the inlet formed in the upper support member constituting the support frame, introduced into the inner peripheral hollow portion of the filtration membrane structure through the inlet, and treated water from the inside to the outside of the filtration membrane structure And a partition member that guides the treated water to the discharge portion through the treated water passage gap formed between the outer periphery of the filtration membrane structure ,
A support frame body of the filtration filter has a grid-like inner cylinder member located inside the cylindrical filtration membrane structure, a grid-like outer cylinder member located outside, an upper support member located on the upper side, and a lower side. A lower support member that
The filtration membrane structure is connected and loaded only between the upper support member between the lattice-like inner cylinder member and the lattice-like outer cylinder member of the support frame, and the lattice-like inner cylinder member and the lattice-like outer cylinder With the member and the lower support member fixed in the filtration tower, the upper support member and the filtration membrane structure can be detached from the grid-like inner cylinder member, the grid-like outer cylinder member, and the lower support member and detachable. A filtering device characterized. The partition member is
While being formed in a substantially cylindrical shape,
An inner cylinder portion provided with an end wall portion protruding upward from the bottom wall and closing the lower end opening of the inner peripheral hollow portion of the filtration filter, and a peripheral wall portion formed with an opening communicating with the treated water discharge portion. The filtration apparatus according to claim 4, further comprising: The filtration apparatus according to claim 4 or 5 , wherein the filtration apparatus is used for filtration treatment of primary cooling water of a pressurized water nuclear power plant.

Images