JP2000197803A5 - - Google Patents

Description

[0003]
By the way, the precoat filter was employ | adopted for the filter element of the early stage pre-filtration apparatus of a condensate system. After that, electromagnetic filters and hollow fiber membrane filters have been adopted, but there are still many precoat type filters. The precoat filter is made of, for example, cylindrical porous carbon. The surface of the porous carbon is precoated with a precoat material such as α-cellulose, and suspended substances are removed by the precoat layer. It prevents clogging. However, in the case of a precoat filter, it is necessary to precoat the porous carbon, and for example, the suspended matter accumulates on the surface of the precoat material in a short period of 2 to 3 weeks, and the differential pressure of the precoat filter increases. to order, after removal of the deposits and the precoat material to backwash the precoat filter with large amounts of water, not have to pre-coated again precoat material, it requires more people to precoat operation, moreover precoat Since the disposal of the material is necessary, there is a problem that the maintenance cost becomes extremely high. In addition, precoat-related facilities such as storage tanks, pipes, pumps, etc. for precoating are necessary, and the occupied space is necessary, and there is a problem that the equipment becomes expensive.

[0005]
[Problems to be solved by the invention]
However, when a pleated type cartridge filter is used instead of the precoat filter, the pleated type cartridge filter is a disposable type. Therefore, when the differential pressure increases, the pleated type cartridge filter must be renewed. The filter consists of flammable materials such as pleated filters that share the filtration surface, and non-combustible materials such as cores, protectors, and end plates that share the strength surface. It must be sorted into Combustible materials such as pleated filters can be incinerated as they are, but non-combustible materials such as cores, protectors, and end plates cannot be incinerated and must be specially treated as waste. Moreover, incombustible materials such as the core, protector, and end plate can be used repeatedly, but since they are an integral structure with combustible materials, they must be discarded as they are, and resources are wasted. As described above, the conventional pleated type cartridge filter has a problem that the disposal process is troublesome and the processing cost is high, it is not preferable in terms of resource saving , and the load on the environment is increased.

[0007]
[Means for Solving the Problems]
The pleated type cartridge filter according to claim 1 of the present invention includes a pleated filter body formed by folding a filter sheet into a pleat shape to form a tubular shape as a whole, and covering the entire inner surface of the pleated filter body. An internal protective body for protection, an external protective body for covering and protecting the entire outer surface of the pleated filter body, and upper and lower end plates respectively integrated at the upper and lower ends of the three members, and each member is incinerated It consists freely synthetic resin, and also the in which you characterized in that it is supported by a supporting tube disposed inside of the internal protector in use.

[0009]
Moreover, the filtration device according to claim 3 of the present invention, a perforated plate that divides the inside of the container in the upstream chamber and the downstream chamber, each mounted on respective communication holes of the perforated plate, and, the downstream from the upstream chamber An incinerated pleat type cartridge filter that filters the liquid to be processed flowing into the chamber, a support cylinder that supports and reinforces the cartridge filter from the inside of the pleat type cartridge filter , and the support cylinder and the cartridge filter are The pleated type cartridge filter includes a pleated filter body formed by folding a filter sheet into a pleat shape to form a cylinder as a whole, and an entire inner surface of the pleated filter body. An inner protector that covers and protects, an outer protector that covers and protects the entire outer surface of the pleated filter, and upper and lower ends of these three members The fixing means is attached to one end portion of the shaft member penetrating the support tube and the shaft member protruding from the perforated plate to the downstream chamber side, and the pleats. First fastening means for fixing the mold cartridge filter from the downstream chamber side, and second fastening means attached to the other end portion of the shaft member protruding from the cartridge filter and fixing the cartridge filter from the upstream chamber side. , first, it included in one of the second fastening means, and, the pleated cartridge filter is characterized in that it has an elastic member for elastic contact against the perforated plate.

[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the embodiment shown in FIGS. In each figure, FIG. 1 is a view showing an embodiment of the pleated cartridge filter of the present invention, an exploded perspective view showing the upper half of the pleated filter, and FIG. 2 is a pleated cartridge shown in FIG. 3 is a cross-sectional view in the longitudinal direction of the filter, FIG. 3 is a diagram showing a flow of one embodiment of the filtration device of the present invention, and FIG. 4 is an intermediate portion showing the attachment state of the filter element shown in FIG. 1 in the filtration device shown in FIG. It is sectional drawing of the longitudinal direction shown abbreviate | omitting.

[0014]
As shown in FIG. 1, the filtration sheet 11 has a laminated structure in which three types of nonwoven fabrics are stacked. The first layer nonwoven 11A of outwardly coarse nonwoven substantially incapable filtration of suspended solids, such as iron oxide particles, for example (which is referred to as "micro-spunbond" or "spunbond".) Melt bone good better not. The fibers constituting the first layer nonwoven fabric 11A preferably have a fiber diameter of 20 to 80 μm, a basis weight of 20 to 100 g / m 2, and an opening of 60 to 250 μm. Although the fiber diameter and the basis weight are affected by the pitch of the pleats, the membrane surface effective utilization rate (permeated water passage area / total membrane area) is 80% or more, preferably 100%. It is preferable that both of these values be in the above range. The intermediate second layer nonwoven fabric 11B is a filtration membrane for filtering suspended substances. For example, when it is used in a condensate system of a thermal power plant, it is an average for achieving a iron removal rate of 80%, more preferably 85% or more. Those having a pore diameter of 2 to 10 μm are preferable, and as such a filtration membrane, for example, those used in conventional pleated cartridges can be used. The inner third layer nonwoven fabric 11C is for securing a water passage for the filtration sheet 11 and reinforcing its structural strength, and can be the same as the net-like one or the first layer nonwoven fabric 11A. .

[0017]
Next, an embodiment of the filtration device of the present invention using the cartridge filter 10 will be described with reference to FIGS. As shown in FIG. 3, the filtration device 20 of the present embodiment is arranged as a pre-filtration device of a condensate demineralizer (not shown) on the downstream side of the condenser 30. The filtration device 20 and the condenser 30 are connected via a raw water line 31, and the filtration device 20 and the condensate demineralization device are connected via a treated water line 32.

[0018]
As shown in FIGS. 3 and 4, the filtering device 20 includes a container 21, an inside of the container 21, an upstream chamber (hereinafter referred to as “lower chamber”) 21 A, and a downstream chamber (hereinafter referred to as “upper chamber”). referred.) divided into 21B, and a porous plate 22 which is formed a number of water passing holes 22A are dispersed, respectively mounted on respective communication holes 22A of the porous plate 22, and the upper chamber from the lower chamber 21A An incinerated cartridge filter 10 that filters raw water flowing to 21B, a support tube (inner tube) 23 that strongly supports and reinforces the cartridge filter 10 from the inside of the cartridge filter 10, and the inner tube 23 and the cartridge Fixing means 24 for fixing the filter 10 to each water passage hole 22 </ b> A of the porous plate 22 is provided.

[0019]
For example, the inner tube 23 is formed to have a length slightly shorter than the three of the cartridge filters 10, and the outer diameter thereof is formed so as to form a slight gap with the inner protector 13 of the cartridge filter 10. Has been. Then, a large number of water passing holes 23A over the entire surface of that (see FIG. 4) is formed. Therefore, when the condensate flows into the lower chamber 21A as raw water, it is treated by the cartridge filter 10 and the treated water reaches the upper chamber 21B from the inner tube 23 via the water passage hole 22A of the porous plate 22. ing.

[0020]
The raw water line 31 is provided with a condensate pump 33 and a valve 34. The raw water is supplied to the lower chamber 21A of the filtration device 20, and the treated water filtered by the cartridge filter 10 is treated via the upper chamber 21B. Supply from line 32 to condensate demineralizer . Blow pipes 35 and 36 are connected to the raw water line 31 and the treated water line 32, respectively, and air vent pipes 37 and 38 are connected to the vicinity of the porous plate 22 in the lower chamber 21A and the treated water line 32, respectively. Water is drained and supplied using the pipes 35 and 36 and the air vent pipes 37 and 38.

[0021]
By the way, the fixing means 24 of the cartridge filter 10 can be used for almost all the conventional precoat filter elements except for consumables. For example, as shown in FIG. 4, the fixing means 24 includes a spindle 24A penetrating through the axis of the inner tube 23, guide blades 24B attached in a cross shape on the top of the spindle 24A, and upper and lower parts of the spindle 24A. first, second fastening means 24C for the three cartridge filters 10 of which it respectively attached to both ends connected to the vertical direction so as to correspond to the respective water flow holes 22A of the porous plate 22 and fixed to impart axial elasticity , 24D. The cartridge filter 10 is given elasticity by filtering the three filter cartridges 10 by compressing and deforming the cartridge filter 10 to the treated water side due to a differential pressure between the raw water side and the treated water side (for example, 1.5 kgf / cm 2). This is because a constant pressing force is always applied between the cartridge filters 10 to prevent water leakage from the joint even if the filters 10 are slightly shorter. Even if each cartridge filter 10 is compressed and deformed due to the differential pressure, each cartridge filter 10 is supported from the inside by the inner tube 23, the mechanical strength of each cartridge filter 10 is reinforced, and a stable filtration function is maintained.

[0022]
With the three cartridge filters 10 fixed, the spindle 24A has an upper end that passes through the water passage hole 22A of the porous plate 22 and protrudes toward the upper chamber 21B, and a lower end that extends from the lowermost end plate 15 to the lower chamber 21A. It has a length that protrudes to the side. The first fastening means 24C includes, for example, a ring-shaped presser fitting 24E that closes the water passage hole 22A of the porous plate 22 from the upper chamber 21B side, and a double nut (not shown) that is screwed into the male screw portion at the upper end of the spindle 24A. And have. The second fastening means 24D includes, for example, a ring-shaped receiving metal 24F that receives the three cartridge filters 10 at the lowermost end, an O-ring 24G that seals a gap between the receiving metal 24F and the spindle 24A, and a ring-shaped that holds the O-ring 24G. and O-ring retainer 24H of, and energy storing spring 24I mounted on the lower end of the spindle 24A, a ring-shaped spring receiver 24J for receiving the spring 24I at its lower end, the spring 24I through a spring receiver 24J, and, And a double nut 24K that is screwed into a male screw at the lower end of the spindle 24A. Further, a gasket 24L, a ring-shaped intermediate plate 24M and a double ring gasket 24N are interposed between the porous plate 22 and the end plate 16 in order from the top. Keeps it watertight. The double ring gasket 24N is also interposed between the upper and lower end plates 15 and 16 and between the lowermost end plate 15 and the spring catch 24F, and keeps watertight between them. The tightening load of the spring is preferably 50-60 kg.

[0023]
Further, in FIG. 4, when the existing precoat filter element is replaced and mounted on the cartridge filter 10 of the present embodiment, the long spindle 24O is used for the existing spindle when the existing spindle is short and the three cartridge filters 10 cannot be fixed. In this example, the long bolt 24P is added to form the above-described spindle 24A. However, the present invention is not limited to this.

[0024]
Next, the operation of the filtration device 20 will be described. In a steady state, the condensate in the condenser 30 flows through the raw water line 31 as shown by the arrow in FIG. 3 via the condensate pump 33 driven under the control of the control device, and the raw water is supplied into the lower chamber 21A of the filtration device 20 as raw water. Flow into. When the raw water passes through the cartridge filter 10 from the lower chamber 21A due to the differential pressure (for example, 1.5 kgf / cm 2) between the raw water on the lower chamber 21A side and the treated water on the upper chamber 21B side, Filtered by the filter 10. Even if each cartridge filter 10 is compressed and deformed by this differential pressure, each cartridge filter 10 is supported from the inside by the inner tube 23 to prevent the subsequent deformation, and the subsequent pressure is replaced by the inner tube 23. Therefore, no problem arises in strength even if the cartridge filter 10 is entirely made of polypropylene resin. The treated water after filtration reaches the upper chamber 21B from the inner side of the inner tube 23 via the water passage hole 22A of the porous plate 22, and is supplied to the condensate demineralizer via the treated water line 32.

[0025]
The life of the pleated filter body 12 of the cartridge filter 10 is usually about 2 to 4 years, and during that time, stable filtration performance can be maintained without maintenance, and the filtration device 20 can be continuously operated for about 2 to 4 years. . When clogging occurs in the pleated filter body 12 of the cartridge filter 10 and the differential pressure increases, the cartridge filter 10 is updated to a new one at this point. At the time of renewal, the essential valve is closed and the filtration device 20 is shut off from the condenser 30 and the condensate demineralizer . Next, the raw water and the treated water in the container 21 of the filtration device 20 are discharged from the blow pipes 35 and 36, and the inside is emptied. After the container 21 is opened, the second fastening means 24D of the fixing means 24 is removed from the spindle 24A, and the three cartridge filters 10 are subsequently removed from the spindle 24A. Next, a new cartridge filter 10 is mounted via the inner tube 23, and each cartridge filter 10 is fixed in a state of elastic contact with the porous plate 22 by the second fastening means 24D. At this time, the consumables are also updated.

[0027]
As described above, according to the cartridge filter 10 of the present embodiment, it can be easily and easily replaced as an alternative to the existing precoat filter, and the cartridge filter 10 which is a combustible material, the inner tube 23, and the fixing means 24. Incombustible materials such as these can be easily separated and only the cartridge filter is incinerated, and the incombustible materials can be used repeatedly. In addition, this cartridge filter 10 maintains a maintenance-free and stable filtration function over a long period of time, and since all of the components are made of polypropylene resin, no harmful substances are generated even after complete incineration after use. Without damaging the environment, and reducing the burden on the environment.

[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a cartridge filter according to the present invention, with an upper half of a pleated filter body disassembled.
FIG. 2 is a longitudinal sectional view of the cartridge filter shown in FIG.
FIG. 3 is a diagram showing a flow of one embodiment of the filtration device of the present invention.
4 is a longitudinal sectional view showing a state in which the filter element shown in FIG. 1 is attached in the filtration device shown in FIG. 3 with the intermediate portion omitted.
[Explanation of symbols]
10 Cartridge filter 11 Filtration sheet 12 Pleated cartridge filter 13 Inner protector (internal protector)
14 Protector net (external protector)
15, 16 End plate 20 Filtration device 21 Container 21A Lower chamber (upstream chamber)
21B Upper chamber (downstream chamber)
22 perforated plate 22A water passage hole 23 inner tube (support cylinder)
24 fixing means 24A spindle (shaft member)
24C First fastening means 24D Second fastening means 24I Spring (elastic member)

Claims (1)

A perforated plate for dividing the inside of the container in the upstream chamber and the downstream chamber, the perforated plate respectively mounted on the fluid passing holes of, and incineration freely pleated cartridge for filtering a liquid to be treated flows from the upstream chamber into the downstream chamber a filter, supported from the inside of the pleated cartridge filter, and a support tube for reinforcing the cartridge filter, the support tube and the cartridge filter and a fixing means for fixing to the perforated plate, the pleated cartridge The filter includes a pleated filter body that is formed into a tubular shape as a whole by folding a filter sheet into a pleat shape, an inner protective body that covers and protects the entire inner surface of the pleated filter body, and the pleated filter body. An external protector that covers and protects the entire outer surface of the upper and lower end plates that are integrated at the upper and lower ends of these three members The fixing means is fixed to the shaft member penetrating the support cylinder and one end portion of the shaft member protruding from the perforated plate to the downstream chamber side to fix the pleated cartridge filter from the downstream chamber side. A first fastening means, a second fastening means attached to the other end of the shaft member protruding from the cartridge filter and fixing the cartridge filter from the upstream chamber side, and any one of the first and second fastening means or included in one and filtering device and having an elastic member for elastic contact with the pleated cartridge filter with respect to the perforated plate.