JPH11169677A - Tower filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate such failure of the conventional tower filter that since in the center of a lower partition plate, a sludge discharge part and a baffle plate are arranged, a hollow fiber membrane module cannot be flitted in this part and an upper space becomes a dead space to lower the capacity of the tower filter. SOLUTION: A tower filter 10 is provided with upper and lower partition plates 15, 16 for dividing a tower body 11 into an upper chamber 12, an intermediate chamber 13, and a lower camber 14, a sludge discharge pipe 17 passing through the lower chamber 14 and communicating with the intermediate chamber 13, and plural hollow fiber membrane modules 19 whose both upper and lower ends are fixed to the partition plates 15 and 16 in the part except a space above the sludge discharge pipe 17 respectively and which are arranged in the intermediate chamber 14 along the axial center of the tower body 11, and in the space above the sludge discharge pipe 17 and inside the hollow fiber membrane modules 19, plural hollow fiber membrane modules 18 whose lower ends are sealed are arranged, and also these hollow fiber membrane modules 18 are fixed to and hung from the upper partition plate 15 at the upper ends thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration tower used for condensate filtration in a power plant such as a thermal power plant or a nuclear power plant, and more particularly to a filtration tower having an improved filtration capacity.

[0002]

2. Description of the Related Art Conventionally, in a power plant such as a nuclear power plant or a thermal power plant, steam is produced by utilizing nuclear power or thermal power, and the steam is used to drive a power generation turbine to generate power. For example, in a boiling water nuclear power plant (BWR), as shown in FIG. 5, steam generated in a nuclear reactor 1 is sent to a high-pressure turbine 2A and a low-pressure turbine 2B in this order, and each turbine 2
The generator is rotated at A and 2B. Then, the steam after power generation is cooled by the condenser 3 to be condensed water, and the condensed water is sent to the condensate filtration device 4 and the condensate desalination device 5 in this order, and the equipment such as the reactor 1 and piping such as piping. The metal clad such as iron oxide fine particles generated from the material is removed by the condensate filtration device 4 and then various ionic components such as Fe ions and Cu ions are removed by the condensate desalination device 5.
Then, the condensate is sent to the reactor 1.
Before supplying the condensate to the reactor 1, the high-pressure turbine 2
A and a part of the steam of the low-pressure turbine 2B are respectively supplied to the low-pressure heater 6A and the high-pressure heater 6B to heat the condensate. Further, the cooling water of the nuclear reactor 1 is purified by a filtration and desalination device 7. In FIG. 5, 8A indicated by a broken line is a steam pipe, 8B indicated by a solid line is a condensate pipe, 9A
A, 9B, 9C, 9D and 9E are all pumps.

[0003] As the condensate filtration device 4, a filtration tower 40 shown in FIGS. 6A and 6B may be used. FIG. 6B is a plan view taken along the line BB of FIG. 6A. As shown in the figure, the filtration tower 40 includes an upper chamber 42, an intermediate chamber 43, and a lower chamber 4 inside a tower body 41.
4 and a sludge discharge pipe 47 penetrating through the lower chamber 44 and communicating with the intermediate chamber 43, and a space surrounded by a broken line located above the sludge discharge pipe 47 (hereinafter, referred to as a sludge discharge pipe 47). Both ends are fixed to the partition plates 45 and 46 at the outer periphery of 48, and a plurality of double-end collecting hollows are disposed in the intermediate chamber 43 along the axis of the tower body 41. And a thread membrane module 49. Water collecting pipes 50 corresponding to the respective hollow fiber membrane modules 49 are erected on the lower partition plate 46, and the upper ends of the water collecting pipes 50 and the lower ends of the respective hollow fiber membrane modules 49 are connected. still,
Although not shown, an inflow pipe is branched and connected to the sludge discharge pipe 47. A baffle plate 51 is disposed right above the sludge discharge pipe 47, and the condensed water flowing from the sludge discharge pipe 47 is distributed to the entire inside of the intermediate chamber 43 by the baffle plate 51 and the distribution mechanism 52. is there. Further, at the bottom of the lower chamber 44, an outlet pipe 53 is disposed slightly deviated from the sludge discharge pipe 47, and at the top of the upper chamber 42, an outlet pipe 54 is disposed.

When condensed water is filtered using the filtration tower 40, the condensed water is introduced into the intermediate chamber 43 through a sludge discharge pipe 47 as shown by an arrow X in FIG. And, it is dispersed throughout the intermediate chamber 43 via the distribution mechanism 52. This condensate flows from the outside to the inside of each hollow fiber membrane module 49, and the filtered water flows into each hollow fiber membrane module 49.
From the upper and lower ends into the upper chamber 42 and the lower chamber 44, respectively. Then, the filtered water in the upper chamber 42 flows out of the outlet pipe 54 as shown by the arrow Y in FIG. 6, and the filtered water in the lower chamber 44 flows out of the outlet pipe 53 as shown by the arrow Z in FIG. These filtered waters join together in the condensate piping 8B and are supplied to the condensate desalination device 5. Although not shown, the upper chamber 42 and the lower chamber 44
When a communication pipe for communicating the filter water is provided upright in the filtration tower 40, the filtered water in the lower chamber 44 is supplied to the upper chamber 42 through the communication pipe, and the whole filtered water is connected to the outlet pipe 54 attached to the upper chamber 42. Outflows are also being made. After the suspended matter in the condensed water is removed by the hollow fiber membrane module 49 in the filtration step, the hollow fiber membrane module is bubbled and the suspended matter is discharged from the sludge discharge pipe 47 as described later.

[0005]

However, in the conventional filtration tower 40, as shown in FIGS. 6A and 6B, a sludge discharge pipe 47 and a baffle plate 51 are arranged at the center of a lower partition plate 46. Therefore, the hollow fiber membrane module 49 cannot be attached to this portion, the upper space 48 becomes a dead space, and the processing capacity of the filtration tower 40 is reduced by that much.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a filtration tower capable of eliminating a dead space above an inlet pipe in a tower body and increasing a filtration capacity. .

[0007]

According to a first aspect of the present invention, there is provided a filtration tower, wherein upper and lower partitioning plates partitioning the inside of the tower body into an upper chamber, an intermediate chamber, and a lower chamber; A sludge discharge pipe communicating with the intermediate chamber, and a plurality of first filter elements, both upper and lower ends of which are fixed to the respective partition plates and arranged in the intermediate chamber along the axis of the tower main body, Raw water introduced into the intermediate chamber is filtered by the first filter element, and in a filtration tower for collecting the filtered water in the lower chamber and the upper chamber, a lower end is sealed in a space above the sludge discharge pipe. A plurality of two filter elements are arranged inside the first filter element, and the second filter elements are respectively fixed at the upper ends to the upper partition plate and hung down.

[0008] Further, a filtration tower according to a second aspect of the present invention is characterized in that, in the first aspect, the first and second filter elements are each constituted by a hollow fiber membrane filter element. It is assumed that.

According to a third aspect of the present invention, in the filtration tower according to the first or second aspect, the upper chamber and the lower chamber are connected by a communication pipe passing through the intermediate chamber. It is characterized by the following.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. In each of the drawings, FIG. 1 is a view showing one embodiment of a filtration tower of the present invention, (a) is a cross-sectional view showing the inside thereof, and (b) is a plane viewed from the BB line direction of (a). FIG. 2A is a cross-sectional view showing a single-end collecting hollow fiber membrane module 18 disposed at the center of the filtration tower shown in FIG. 1, and FIG. FIG. 3A is a cross-sectional view showing a double-ended water collecting hollow fiber membrane module disposed outside the hollow fiber membrane module 19; FIG. 3A is a double-ended water collecting hollow fiber membrane module shown in FIG. 1 and a lower partition plate; FIG. 2B is a cross-sectional view showing a connection part with a water collection pipe fixed to the water supply pipe, and FIG. 2B shows a connection part between the hollow fiber membrane module 19 of the conventional filtration tower and a water collection pipe fixed to a lower partition plate. Sectional view, FIG.
Fig. 3 is a view showing another embodiment of the filtration tower of the present invention, (a) is a cross-sectional view showing the inside thereof, and (b) is a plan view from the BB line direction of (a).

As shown in FIGS. 1A and 1B, for example, a filtration tower 10 of this embodiment has an upper chamber 1 in a tower body 11.
2. An intermediate chamber 13 and a lower chamber 14 are formed, and the upper chamber 12 and the intermediate chamber 13 and the intermediate chamber 13 and the lower chamber 14
5 and 16 are defined. And the partition plate 16
Is connected to the upper end of a sludge discharge pipe 17 penetrating through the lower chamber 14, and condensed water from the sludge discharge pipe 17 into the intermediate chamber 13 via a condensate water inflow pipe (not shown) branched and connected to the sludge discharge pipe 17. It has been introduced. A plurality of double-end collecting hollow fiber membrane modules 19 are provided in the main body 11 of the filtration tower.
Are arranged, and the upper end of each hollow fiber membrane module 19 is fixed to the upper partition plate 15, and the lower end is fixed to the water collecting pipe 20 erected on the lower partition plate 16 corresponding to each hollow fiber membrane module 19. Have been. A baffle plate 21 is disposed slightly above the sludge discharge pipe 17, and after condensed water introduced from the sludge discharge pipe 17 is dispersed by the baffle plate 21, the entire intermediate chamber 13 is distributed via a distribution mechanism 22. To all the hollow fiber membrane modules 19
The condensate is distributed throughout the country. Then, the filtered water from each hollow fiber membrane module 19 flows into the lower chamber 14 and the upper chamber 12 from both upper and lower ends thereof, and flows into the respective outlet pipes 2.
It is made to flow out of the tower main body 11 through 3, 24. Therefore, the filtration tower 10 of the present embodiment is configured similarly to the conventional filtration tower 40 in the above-described points.

Now, as shown in FIGS. 1 (a) and 1 (b), the filtration tower 10 of this embodiment is provided with each hollow fiber membrane module 1.
A plurality of hollow fiber membrane modules 18 are provided inside the upper space 9 in the above-described upper space 48, and the upper space is effectively used so as not to be a dead space. As shown in FIG. 1, the hollow fiber membrane module 18 has an upper end fixed to an upper partition plate 16 and hangs down from the partition plate 15. The hollow fiber membrane module 18 is a one-end water collection type hollow fiber membrane module in which filtered water flows out only to the upper chamber 12, unlike the hollow fiber membrane module 19 of the both ends collecting water at the periphery thereof. . In addition, the following two types of hollow fiber membrane modules of the single-end collecting type can be used. First, the upper end of the hollow fiber membrane itself is open and the lower end is closed. In the case of a module using such a hollow fiber membrane, filtered water flows out only from the upper end.
Second, the hollow fiber membrane itself is open at the upper and lower ends. A module using such a double-end collecting hollow fiber membrane is provided with a chamber for once receiving filtered water at the lower end, and a communication pipe for sending filtered water from the chamber to the upper end is installed in the module. It is a thing. In the case of such a hollow fiber membrane module, although the outlet of the filtered water is only at the upper end, the hollow fiber membrane itself is of a water collecting type at both ends. The one-end water collecting type hollow fiber membrane module shown in FIG. 1 is the former example. Although only one hollow fiber membrane module 18 is shown in FIGS. 1A and 1B, a plurality of hollow fiber membrane modules 18 are actually arranged according to the size of the tower main body 11.

As shown in FIG. 2 (a), the one-end collecting hollow fiber membrane module 18 at the center is 100 to 5,000.
About 0 hollow fiber membranes 181 and these hollow fiber membranes 181
And a protection cylinder 182 that stores the bundles. Each hollow fiber membrane 181 is formed as a hollow fiber having an outer diameter of 0.3 to 7 mm and an inner diameter of 0.2 to 5 mm by a resin thin film having fine pores of, for example, 0.01 to 0.3 μm. Also,
A flange portion 182A is formed at the upper end of the protective cylinder 182, and the hollow fiber membrane module 18 hangs down from the partition plate 15 via the flange portion 182A. Further, a skirt portion 182B is formed at a lower end portion of the protection cylinder 182, and the skirt portion 182B collects air at the time of cleaning. At the upper end of the protective cylinder 182, an upper joint 183 is formed by binding and fixing the upper ends of the hollow fiber membranes 181 with an adhesive or the like. A lower joining portion 184 joined and fixed in the same manner as described above is formed. Upper joint 183
, Each hollow fiber membrane 181 is open, and at the lower joint 184, each hollow fiber membrane 181 is closed, so that filtered water flows out from the upper end opening of the hollow fiber membrane 181 and is collected in the upper chamber 12. . A flow hole 184A is formed in the lower joint portion 184, and when the hollow fiber membrane 181 is washed, air collected in the skirt portion 182B through the flow hole 184A is removed.
2 is introduced.

Further, the upper joint 18 of the protective cylinder 182
The flow holes 182C, 182D are respectively formed slightly below the lower portion 3 and slightly above the lower joint portion 184, and the condensate flows into the protective cylinder 182 through the flow holes 182C, 182D, and the flow hole 184A. Along with
The air introduced into the protection cylinder 182 is discharged from the circulation hole 182C.

A distribution mechanism 22 disposed between the lower partition plate 16 and the lower end of each hollow fiber membrane module 18, 19.
The hole 22A is formed corresponding to each hollow fiber membrane module, and a distribution pipe 22B is attached to each hole 22A. A small hole (not shown) is formed on the peripheral surface of each distribution pipe 22B. Accordingly, the distribution mechanism 22 disperses the condensate flowing from the sludge discharge pipe 17 through the plurality of holes 22A throughout the intermediate chamber 13, and compresses the condensed water from each hole 22A toward the lower end of each hollow fiber membrane module 18, 19. Air is bubbled to backwash each hollow fiber membrane module 18, 19. At this time, the compressed air is supplied to the distribution pipe 22B.
Through the small holes, and bubbling as fine bubbles to each of the hollow fiber membrane modules 18 and 19. The compressed air is introduced into the distribution mechanism 22 through the sludge discharge pipe 17.

As shown in FIG. 2 (b), the hollow fiber membrane module 19 disposed on the outer periphery of the hollow fiber membrane module 18 has hollow fiber membranes 191, a protective cylinder 192, an upper joint 193, and a lower joint 193. The hollow fiber membrane module 18 is provided with a joint portion 194 and is configured in the same manner as the hollow fiber membrane module 18 in these points. The difference between the hollow fiber membrane module 19 and the hollow fiber membrane module 18 is that the upper and lower ends of the hollow fiber membrane 191 are open and the filtered water is collected also from the lower end.
The air cleaning mechanism 91 is also different. That is, a water collecting pipe 195 is connected to the lower end of the hollow fiber membrane module 19, and the lower partition plate 1 is connected via the water collecting pipe 195.
6 and is connected to a water collecting pipe 20 erected at 6.

[0017] As shown in FIG.
The upper end of 95 has an enlarged diameter, and a flow path 195B extending upward from the stepped portion and having an opening at an inner wall surface is formed in the enlarged diameter portion 195A at regular intervals in the circumferential direction. In addition, the flow path 19 is provided in the protection cylinder 192.
Holes 192E corresponding to 5B are formed at equal intervals in the circumferential direction,
The inside and outside of the protection cylinder 192 communicate with each other via the hole 192E and the flow path 195B. Further, a skirt member 196 is attached to the enlarged diameter portion 195A of the water collecting pipe portion 195,
Air bubbles flowing out of the distribution mechanism 22 are collected between the skirt portion 196 and the water collecting pipe portion 195, and the flow path 195B, the hole 1
Bubbles are introduced into the protection cylinder 192 via 92E.

As shown in FIG. 1, the hollow fiber membrane modules 18 and 19 are vertically connected to the partition plate 15, respectively. When each hollow fiber membrane module 19 is installed in the tower main body 11, the tip of the water collecting pipe 195 of each hollow fiber membrane module 19 is inserted into the water collecting pipe 20. However, as shown in FIG. 1, the lower partition plate 16 is formed in a gently curved shape.
If the water collecting pipe 20 is slightly inclined from the vertical position with respect to the upper partition plate 15, the tip position of the water collecting pipe part 195 of each hollow fiber membrane module 19 does not match the position of the water collecting pipe 20, and the two are connected. Becomes difficult.

For example, in the case of a conventional filtration tower 40, FIG.
As shown in (b) of FIG.
Since there is only a slight difference from the outer diameter of 0, the inclination allowable range of the water collecting pipe 20 is only slightly inclined as shown by the two-dot chain line circled in FIG. It becomes extremely difficult to attach the water collecting pipe 20 to the water. Therefore, in the case of the filtration tower 10 of the present embodiment, even if the water collection pipe 20 has a slight inclination, a device capable of absorbing the inclination is provided at the lower end of the water collection pipe part 195. That is, the water collecting pipe section 1
The inner diameter of 95 is the same as the conventional one.
However, the outer diameter of the water collecting pipe section 195 is formed to have substantially the same outer diameter as the conventional one only in a small range above and below the mounting position of the seal member 196, and the tapered surfaces 195C, 1
95D is formed. Therefore, even if the water collecting pipe 20 is greatly inclined to the range shown by the two-dot chain line circled in FIG. 3A, the water collecting pipe part 195 is inserted into the water collecting pipe 20 via the tapered surface 195C at the lower end, The seal member 196 can keep the connection portion liquid-tight.

Next, the operation will be described. When condensate is filtered, a valve (not shown) for the sludge discharge pipe 17 and the outlet pipes 23 and 24 arranged above and below the tower body 11 is used.
And close the other valves. When condensed water is supplied from the condensate inflow pipe communicating with the sludge discharge pipe 17 in this state, the condensate flows from the sludge discharge pipe 17 into the intermediate chamber 13 as shown by an arrow X in FIG. Then, it is dispersed throughout the intermediate chamber 13 via the distribution mechanism 22 and spreads over the entire hollow fiber membrane modules 18 and 19.

In the hollow fiber membrane module 18 at the center, the flow holes 182 of the protection cylinder 182 of each hollow fiber membrane module 18 are provided.
C, 182D and flow through each protection tube 182 via the flow hole 184A of the lower coupling portion 184. Each protection cylinder 182
In the condensate, the condensate permeates from the outside to the inside of each hollow fiber membrane 181, and at this time, the suspended substance contained in the condensate is captured on the outer surface of the hollow fiber membrane 181. The filtered water is applied to each hollow fiber membrane 1
81, the filtered water rises in each hollow fiber membrane 181 and flows out into the upper chamber 12 from the upper end opening of each hollow fiber membrane 181.

On the other hand, in the surrounding hollow fiber membrane modules 19, the flow holes 19 of the protection cylinder 192 of each hollow fiber membrane module 19 are provided.
It flows into each protection cylinder 192 via 2C, 192D and the passage 195B of the water collecting pipe part 195. The condensate is filtered by each hollow fiber membrane 191 in each protection cylinder 192,
The filtered water flows out from the upper and lower ends of each hollow fiber membrane 191 into the upper chamber 12 and the lower chamber 14, respectively.

The filtered water in the upper chamber 12 and the lower chamber 14 respectively flows out of outlet pipes 23 and 24 as shown by Y and Z in FIG. It is supplied to a desalination unit.

According to the present embodiment as described above,
A plurality of single-end collecting hollow fiber membrane modules 18 whose lower ends are sealed in a space above the sludge discharge pipe 17 and the baffle plate 21 are arranged inside a double-end collecting hollow fiber membrane module 19 and these hollow fibers are arranged. Since the upper end of the membrane module 18 is fixed to the upper partition plate 15, the space above the sludge discharge pipe 17 and the baffle plate 21, which has been a dead space in the past, is effective as a space for installing the single-end collecting hollow fiber membrane module 18. And the filtration area can be increased, and the filtration capacity of the condensate can be remarkably increased.

FIG. 4 is a view corresponding to FIG. 1 showing a filtration tower 10A according to another embodiment of the present invention, and the same reference numerals as those shown in FIG. 1 indicate the same members. As shown in FIG. 4, the filtration tower 10A according to the present embodiment communicates the upper chamber 12 and the lower chamber 14 with a plurality of (four in the figure) communication pipes 25 penetrating the intermediate chamber 13, and the upper part is connected to the upper part when water is passed. It is characterized in that the outlet pipe 24 of the chamber 12 is not used, and the other points are the same as those of the filtration tower 10 of the above embodiment. Therefore, in the present embodiment, the filtered water in the upper chamber 12 flows into the lower chamber 14 via the communication pipe 25, and flows out of the outlet pipe 23 together with the filtered water collected in the lower chamber 14.

According to this embodiment, the same operation and effect as those of the above embodiment can be expected. Further, the outlet pipe 24 of the upper chamber 12 and the outlet pipe 23 of the lower chamber 14 are connected outside the tower body 11. Piping becomes unnecessary, and the piping structure outside the tower body 11 can be simplified.

In the above embodiment, a filter element using a hollow fiber membrane module as the filter element has been described. However, the present invention can be applied to a filter other than the hollow fiber membrane module, for example, a pre-coated filter. In short, the present invention can be applied if the sludge discharge pipe of raw water is opened by the partition plate of the tower main body and a dead space is formed above the sludge discharge pipe. FIG.
4 and FIG. 4, the example in which the condensate inflow pipe branched to the sludge discharge pipe 17 is used when the condensate flows into the filtration tower has been described. Through
Condensed water may be allowed to directly flow into the intermediate chamber 13.

[0028]

According to the first and second aspects of the present invention, there is provided a filtration tower capable of eliminating a dead space above a sludge discharge pipe in a tower body and increasing a filtration capacity. be able to.

According to the third aspect of the present invention, in the first or the second aspect,
It is possible to provide a filtration tower capable of simplifying a piping structure of an outflow piping of filtered water.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a filtration tower of the present invention,
(A) is a cross-sectional view showing the inside thereof, (b) is B-
It is a top view from the B line direction.

FIG. 2A is a cross-sectional view showing a single-ended water collecting hollow fiber membrane module disposed at the center of the filtration tower shown in FIG. 1;
FIG. 2B is a cross-sectional view illustrating a double-ended water collecting hollow fiber membrane module disposed outside the single-ended water collecting hollow fiber membrane module shown in FIG. 1.

3 (a) is a cross-sectional view showing a connecting portion between a hollow fiber membrane module of a double-end collecting type shown in FIG. 1 and a collecting pipe fixed to a lower partition plate, and FIG. 3 (b) shows a conventional filtration tower. It is sectional drawing which shows the connection part of the hollow fiber membrane module of both ends water collection type, and the water collection pipe fixed to the lower partition plate.

FIG. 4 is a view showing another embodiment of the filtration tower of the present invention,
(A) is a cross-sectional view showing the inside thereof, (b) is B-
It is a top view from the B line direction.

FIG. 5 is a flowchart showing an outline of a boiling water nuclear power plant.

6 is a view showing a conventional filtration tower used in the boiling water nuclear power plant shown in FIG. 5, (a) is a cross-sectional view showing the inside, and (b) is a BB line of (a). It is a top view from a direction.

[Explanation of symbols]

 10, 10A Filtration tower 11 Tower main body 12 Upper chamber 13 Intermediate chamber 14 Lower chamber 15, 16 Partition plate 17 Sludge discharge pipe 18 Single-ended collecting hollow fiber membrane module 19 Double-ended collecting hollow fiber membrane module 20 Collecting pipe 25 Communication pipe

Claims (3)

[Claims] An upper and lower partition plate for partitioning the inside of a tower body into an upper chamber, an intermediate chamber, and a lower chamber, a sludge discharge pipe penetrating the lower chamber and communicating with the intermediate chamber, and upper and lower ends of each of the partition plates. A plurality of first filter elements having a fixed portion and disposed in the intermediate chamber along an axis of the tower main body,
Raw water introduced into the intermediate chamber is filtered by the first filter element, and a lower end is sealed in a space above the sludge discharge pipe in a filtration tower that collects the filtered water in the lower chamber and the upper chamber. A filtration tower, wherein a plurality of second filter elements are arranged inside the first filter element, and the second filter elements are fixed to the upper partition plate at their upper ends, respectively, and are suspended therefrom. 2. The filtration tower according to claim 1, wherein the first and second filter elements are each constituted by a hollow fiber membrane filter element. 3. The apparatus according to claim 1, wherein the upper chamber and the lower chamber are connected by a communication pipe penetrating the intermediate chamber.
Or the filtration tower according to claim 2.