JP4544726B2 - Filter member and filtration device equipped with the filter member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter member used for filtration of general industrial condensate, tap water, industrial water, industrial wastewater, power plant water, boiler condensate treatment, and the like, and a filtration device including the filter member.
[0002]
[Prior art]
For example, in a thermal power plant, steam generated in a boiler is sent in the order of a high-pressure turbine and then a low-pressure turbine, the generator is rotated in each turbine to generate power, and the steam after power generation is cooled by a condenser and recovered as condensate. It is sent to the water purification system and used repeatedly. In the condensate purification system, condensate is sent in the order of the filtration device and the condensate desalination device, suspended substances such as iron oxide fine particles generated from equipment such as boilers and piping materials such as piping, Cu ions, Na ions, After removing various ion components such as Cl ⁻ ions, the condensate is passed through the low-pressure feed water heater and the high-pressure feed water heater in this order, and sent to the boiler.
In the boiling water nuclear power plant (BWR), steam generated in the nuclear reactor is sent in the order of the high-pressure turbine and low-pressure turbine, and the generator is rotated in each turbine to generate electricity. It is cooled and sent to the condensate purification system as condensate for repeated use. In the condensate purification system, condensate is sent in the order of filtration device and condensate demineralization device, suspended substances such as iron oxide fine particles generated from equipment such as nuclear reactors and piping materials such as piping, Cu ions, Na ions , Cl ^- after removal of the various ion components such as ions, through the condensate low-pressure feed water heater, in order of the high-pressure feed water heater, and sends it to the reactor. In addition to the condensate purification system, the power plant is also equipped with a reactor coolant purification system and a fuel pool cooling and purification system. These purification systems also remove suspended substances and ion components generated in the system. It has been removed.
[0003]
As the filtration device used in each of the purification systems described above, for example, a filter member suspended from and supported by a water collecting hole formed in a grid plate installed in the tower body is used. In addition, as the filtration element, a substantially cylindrical cartridge type in which a filtration membrane is folded around a core, for example, in a pleat shape, and the outside is covered with a polypropylene net, for example, is used. A porous tube is arranged so as to penetrate the hollow portion, and the upper end side of the porous tube is inserted into the water collecting hole of the above-described eye plate, and protrudes toward the filtered water chamber formed at the upper part with the eye plate as a boundary. , Fixed with a nut and suspended. A cylindrical spacer member is disposed between the lower end of the face plate and the upper end of the filtration element, thereby restricting the upper end position of the filtration element. Moreover, a nut is attached to the lower end side of the perforated pipe, and the lower end position of the filtration element is regulated by this nut.
[0004]
[Problems to be solved by the invention]
By the way, the length of the cartridge-type filtration element described above usually allows a certain amount of manufacturing error. Therefore, as described above, when the upper and lower end positions of the filtration element on the porous tube are fixed by the spacer member and the nut, if the filtration element is attached to the porous tube so as not to move up and down, Since the manufacturing error is included, it is necessary to change the tightening position of the nut for each perforated tube to which the filtration element is attached, and the work of attaching the filtration element to hundreds of perforated tubes becomes very troublesome.
[0005]
In addition, in the case of two filtration elements arranged in series, the length contracts by a maximum of about 10 mm at the initial stage of water flow. Therefore, even if the filtration element is accurately installed in consideration of the above manufacturing tolerances, when the water flow is started and wetted, a gap is generated between the nut or spacer and the filtration element, There is a possibility that the filtration element vibrates around the perforated tube during the water flow treatment, so that water to be treated that does not pass through the filtration element and is sent to the filtered water chamber without being treated may be generated.
[0006]
On the other hand, as a technique for solving the above-described problem, a coil spring is disposed between the upper end of the perforated tube protruding above the eye plate and the upper surface of the eye plate, and this coil spring is disposed in the element chamber. There is known a means for absorbing a manufacturing tolerance and a shrinkage amount at the time of wetting by constantly pressing and energizing the filtered element toward the lower surface of the eye plate.
[0007]
However, the coil spring used in the above technique varies depending on the material, the wire diameter, the coil average diameter, etc. in consideration of the above manufacturing tolerance (± several mm) and the maximum shrinkage when wet (about 10 mm). A free length of about 100 mm to about 150 mm is required. In consideration of the thickness of other fixing nuts and the like, the porous tube protrudes above the eye plate for about 200 mm.
[0008]
The height of the filtered water chamber is determined in consideration of the work space for assembly, dismantling, maintenance, inspection, etc., but as a pretreatment filtration device etc. in the condensate purification system of a nuclear power plant There are many places where the height is limited. Therefore, when the coil spring is provided on the eyeplate, the height of the filtrate water chamber cannot be increased, and the work space is limited. That is, if the height of the spring or the like overhanging on the eye plate is high, workability becomes very poor during assembly, disassembly, maintenance, and inspection. Further, when a coil spring is arranged on the eyeplate, it becomes a resistance when the treated water flows out. Further, the provision of the coil spring increases the generation factor of rust and the like, which causes the quality of the treated water to deteriorate.
[0009]
The present invention has been made in view of the above, and can absorb the manufacturing tolerance of the cartridge type filtration element and the shrinkage amount during water flow, and can easily attach the filtration element to the porous tube at the time of production. In addition, it has a structure that can prevent the generation of untreated water that does not pass through the filtration element during water flow treatment, and this structure limits the working space of the filtered water chamber and the flow of treated water in the filtered water chamber. It is an object of the present invention to provide a filter member that does not cause turbulence in the path or a new cause of the quality of treated water and a filtration device including the filter member.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention according to claim 1 is a filter member supported by each of a plurality of water collecting holes formed in a grid plate that partitions the inside of the tower body into a filtered water chamber and an element chamber. And
A perforated tube that is suspended and supported in the element chamber by being inserted into the water collecting hole of the eyeplate and being locked on the filtered water chamber side;
A cartridge-type filtration element formed in a substantially cylindrical shape, which is attached around the perforated tube and passes the water to be treated from the outside to the inside for filtration.
A lower end position restricting member attached to the perforated pipe and restricting the lower end position of the filtration element;
Provided is a filter member comprising a spring member mounted between an upper end of the filtration element and a lower surface of the eyeplate, and biasing the filtration element toward the lower end position regulating member.
According to a second aspect of the present invention, there is provided the filter member according to the first aspect, wherein a plurality of the filtering elements are arranged in series along the porous tube.
According to a third aspect of the present invention, there is provided a tower plate in which a plurality of water collecting holes are formed, the tower body having the upper part as a boundary and the lower part as an element chamber with the eye plate as a boundary, and the eyes. A filtration device comprising a plurality of filter members supported by each water collecting hole of the plate and disposed in the element chamber,
The filter member is
A perforated tube that is suspended and supported in the element chamber by being inserted into the water collecting hole of the eyeplate and being locked on the filtered water chamber side;
A cartridge-type filtration element formed in a substantially cylindrical shape, which is attached around the perforated tube and passes the water to be treated from the outside to the inside for filtration.
A lower end position restricting member attached to the perforated pipe and restricting the lower end position of the filtration element;
A filtration device comprising a spring member mounted between an upper end of the filtration element and a lower surface of the eyeplate, and biasing the filtration element toward the lower end position regulating member. provide.
According to a fourth aspect of the present invention, there is provided the filtration apparatus according to the third aspect, wherein a plurality of the filtration elements are arranged in series along the porous tube.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in more detail with reference to the drawings. FIGS. 1-7 is a figure which shows one Embodiment of this invention, In these figures, 1 shows the tower body of a filtration apparatus, 2 shows a filter member. In the tower main body 1, a plate 10 having a plurality of water collecting holes 10 a is disposed, and a filtered water chamber 11 is formed at the upper portion and an element chamber 12 is formed at the lower portion with the plate 10 as a boundary. ing.
[0012]
A plurality of filter members 2 are supported in a suspended manner in the element chamber 12 corresponding to each of the plurality of water collecting holes 10a. Then, the treated water to be treated flows into the element chamber 12 through the inflow pipe 13, and the treated water that has flowed hits the lower part (end plate) of the tower so that the lower part of the tower serves as a baffle plate. The water is uniformly distributed therein, filtered through the filter member 2, and flows into the filtered water chamber 11 as filtered water, and is then sent from the outflow pipe 14 to the next process.
[0013]
Specifically, as shown in FIG. 2, the filter member 2 includes a perforated tube 21 and a filtration element 22 mounted around the perforated tube 21. As shown in FIG. 3, the porous tube 21 is made of, for example, stainless steel, and a plurality of small holes 21 a are formed on the peripheral surface, and a plurality of, for example, two filtration elements 22 are formed along the length direction. Has a length capable of supporting (see FIG. 2).
[0014]
In the perforated tube 21, an end wall member 21b is fixed to an end portion which becomes the lower end side when suspended from the eyeplate 10, and a bolt 21c projects outwardly from the end wall member 21b. It is fixed. In addition, a flange 21d is welded to the outer periphery of the end plate 10 at a position close to the lower end direction by a predetermined length from the upper end when it is suspended from the eye plate 10. When the flange 21d is inserted into the water collecting hole 10a of the eyeplate 10 from below, the flange 21d comes into contact with the lower surface of the eyeplate 10, and the amount of protrusion of the porous tube 21 toward the filtrate chamber 11 is regulated and made constant. is there. Therefore, the welding position of the flange 21d prevents the dropout from the water collection hole 10a on the filtered water chamber 11 side after passing through the water collection hole 10a when the porous tube 21 is inserted into the water collection hole 10a. It becomes a position which can fasten lock nut 21e to perform (refer to Drawing 2 and Drawing 4).
[0015]
As shown in FIG. 7, for example, the filtration element 22 is disposed around the cylindrical core 23 in a substantially cylindrical shape with the filtration membrane 24 folded in a pleat shape, and the outer periphery thereof is made of polypropylene. A pleated filter covered with a net member 25 is used. A substantially annular end member 26 for holding the filtration membrane is disposed at each end of the filtration element 22, and each end 23 a, 23 b of the core 23 protrudes outward. The porous tube 21 is disposed through the core 23.
[0016]
As described above, in the present embodiment, two filtration elements 22 are disposed along the longitudinal direction of the porous tube 21, but the end of the upper end side of the core 23 in the filtration element 22 arranged on the upper side. As shown in FIG. 5, the upper socket 27 is attached to 23a with an O-ring 23c interposed. Further, the lower end 23b of the core 23 of the filtration element 22 arranged on the lower side has a lower portion having an insertion hole through which the bolt 21c of the porous tube 21 is inserted at the center as shown in FIG. A socket 28 is mounted with an O-ring 23c interposed. In order to prevent leakage of untreated water from the insertion hole, sealing gaskets 28 a and 28 b are loaded around the bolt 21 c sandwiching the lower socket 28. Further, between the end 23b on the lower end side of the filtration element 22 arranged on the upper side and the end 23a on the upper end side of the filtration element 22 arranged on the lower side, as shown in FIG. A connection socket 29 for sealingly connecting the two is mounted with a ring (not shown) interposed therebetween.
[0017]
A lower nut 30 as a lower end position restricting member for restricting the lower end position of the filtration element 22 is disposed below the lower socket 28 in the bolt 21c via a washer 30a (see FIGS. 2 and 6). Of course, the lower nut 30 only needs to prevent the downward movement of the filtration element 22, and the number of the lower nuts 30 is not limited as long as such a function can be performed.
[0018]
In the present embodiment, the bolt 21c is engaged with the flat bar 31 by inserting the bolt 21c into the connecting hole formed in the flat bar 31 below the lower nut 30. The two lock nuts 32 and 33 which prevent the separation from the 21c and also have the function of regulating the lower end position of the filtration element 22 together with the lower nut 30 are screwed together. The flat bar 31 is formed in a lattice shape and has a structure in which the connecting holes are formed at predetermined intervals on the front, rear, left, and right sides. The bolts 21c of the pipe 21 are connected to each other, and the interval between the adjacent filter members 2 is kept constant.
[0019]
When the perforated tube 21 is inserted through the water collecting hole 10a of the eye plate 10 and attached, the space between the eye plate 10 and the above-described filtration element 22 disposed on the upper side is shown in FIG. As described above, the perforated tube 21 has a flange 21d that comes into contact with the lower surface of the eyeplate 10, and the upper socket 27 is mounted on the core end 23a on the upper end side of the filtration element 22 as described above. Therefore, a coil spring 40 as a spring member is disposed between the flange 21d and the upper socket 27 and around the perforated tube 21.
[0020]
Since this coil spring 40 has its upper end in contact with the flange 21d and its lower end in contact with the upper socket 27, all parts from the upper socket 27 including the two filtration elements 22 to the lower socket 28 are normally operated. Then, it is elastically biased so as to be pressed against the lower nut 30 which is a lower end position restricting member. That is, it functions to constantly urge each filtration element 22 toward the lower nut 30 that is the lower end position restricting member.
[0021]
The material for forming the coil spring 40 is not limited, but stainless steel metal is preferable from the viewpoint of rust prevention, and austenitic stainless steel is particularly preferable.
[0022]
According to the present embodiment, the filtration element 22 is attached to the porous tube 21 via the coil spring 40 that contacts the flange 21 d formed on the porous tube 21. Therefore, at the time of manufacture, after attaching the coil spring 40, the two filter elements 22 are pushed in sequentially, and the lower nut 30 is screwed into a predetermined position of the bolt 21c protruding from the perforated tube 21, so that the filter is filtered. Since the element 22 is pressed against the lower nut 30 by the coil spring 40, it is not necessary to change the fastening position of the lower nut 30 in consideration of the manufacturing tolerance of the filtration element 22 for each filter member 2. In other words, a plurality of filter members 2 are arranged in the tower body 1. In any filter member 2, the elastic urging force of the coil spring 40 can be obtained simply by fastening the lower nut 30 at a fixed position. Thus, no gap based on manufacturing tolerance is generated, and it is possible to prevent untreated water that does not pass through the filtration element 22 from being generated.
[0023]
Further, when the filtration element 22 gets wet in the initial stage of water flow, contraction of about 5 mm to about 10 mm occurs in the length direction when two filtration elements 22 are arranged in series as shown in FIG. However, according to this embodiment, the coil spring 40 always presses the filtration element 22 toward the lower nut 30. For this reason, even if the above-mentioned shrinkage phenomenon occurs, there is no gap due to shrinkage between the filtration element 22 and each of the sockets 27, 28, 29, etc., and the generation of untreated water caused by this shrinkage. Can also be prevented.
[0024]
Moreover, according to the present embodiment, the coil spring 40 is provided in the element chamber 12 below the eye plate 10. For this reason, compared with the conventional means which arrange | positions the coil spring 40 on the eyeplate 10, the height of the member which protrudes on the eyeplate 10 becomes only the thickness of nuts etc., and falls significantly. Therefore, it is possible to secure a sufficient work space for assembling the filtration device, and there is no resistance to the treated water flow in the filtrate water chamber. Even if rust is generated in the coil spring 40, the rust is removed by the filtration element 22 and then supplied to the filtered water chamber 11, so that the quality of the treated water is not deteriorated.
[0025]
【The invention's effect】
As described above, in the present invention, the filter member urges the filtration element toward the lower end position regulating member attached to the perforated pipe between the upper end of the filtration element and the lower surface of the eye plate. It has. Therefore, since the filtration element is constantly pressed by this spring member, it is possible to absorb the manufacturing tolerance of the filtration element and the amount of contraction due to water flow. For this reason, it is possible to facilitate the assembling work of the filter members that must be arranged in the tower body, and to prevent the generation of untreated water that does not pass through the filtration element. In addition, since the spring member is located in the element chamber below the eyeplate, the work space in the filtrate chamber is limited, the flow path of the treated water in the filtrate chamber is disturbed, or the treated water quality is lowered. It can be suppressed.
[Brief description of the drawings]
FIG. 1 is a diagram showing an internal structure of a filtration device according to an embodiment of the present invention.
FIG. 2 is a view showing a filter member according to an embodiment of the present invention.
FIG. 3 is a view showing a porous tube used in the embodiment.
4 is an enlarged view of a part A in FIG. 2;
FIG. 5 is an enlarged view of a portion C in FIG.
6 is an enlarged view of a portion B in FIG.
FIG. 7 is a perspective view showing a part of the filtration element used in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tower main body 10 Top plate 10a Water collecting hole 11 Filtration water chamber 12 Element chamber 2 Filter member 21 Porous pipe 22 Filtration element 30 Lower nut 40 Coil spring

Claims (4)

A filter member supported by each of a plurality of water collecting holes formed in a grid plate dividing the inside of the tower body into a filtered water chamber and an element chamber,
A perforated tube that is suspended and supported in the element chamber by being inserted into the water collecting hole of the eyeplate and being locked on the filtered water chamber side;
A cartridge-type filtration element formed in a substantially cylindrical shape, which is attached around the perforated tube and passes the water to be treated from the outside to the inside for filtration.
A lower end position restricting member attached to the perforated pipe and restricting the lower end position of the filtration element;
A filter member, comprising: a spring member mounted between an upper end of the filtration element and a lower surface of the eyeplate, and biasing the filtration element toward the lower end position regulating member. The filter member according to claim 1, wherein a plurality of the filtering elements are arranged in series along the porous tube. It has a plate with a plurality of water collecting holes formed, and is supported by the tower body that forms the filtrate water chamber and the lower part of the element chamber with the plate as a boundary, and each water collecting hole of the plate. A filtration device comprising a plurality of filter members disposed in the element chamber,
The filter member is
A perforated tube that is suspended and supported in the element chamber by being inserted into the water collecting hole of the eyeplate and being locked on the filtered water chamber side;
A cartridge-type filtration element formed in a substantially cylindrical shape, which is attached around the perforated tube and passes the water to be treated from the outside to the inside for filtration.
A lower end position restricting member attached to the perforated pipe and restricting the lower end position of the filtration element;
A filtration device comprising a spring member mounted between an upper end of the filtration element and a lower surface of the eyeplate, and biasing the filtration element toward the lower end position regulating member. The filtration device according to claim 3, wherein a plurality of the filtration elements are arranged in series along the porous tube.

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