JP3089597B2 - Ultra-fine filter for filtering seawater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrafine filter for filtering seawater (also referred to herein as an ultrafine filter).

[0002]

2. Description of the Related Art In general, power plants utilizing seawater, chemicals,
A large amount of sea creatures such as barnacles and mussels such as barnacles adhere to the walls of intake channels of steel plants and the like, and screens for removing debris in seawater, and downstream thereof.

[0003] Therefore, the plant operation side is trying to take the following countermeasures to prevent this marine organism adhesion.

[0004] 1) Antifouling paint A paint of a type that releases a slight poison for a long period of time (1 to 2 years) or a paint that dissolves and prevents the adhesion of marine organisms is applied.

2) Underwater robot A brush is rotated and rocked along the wall of a waterway to peel off and clean larvae and larvae of marine life.

3) Higher speed of water flow An average flow velocity is set so that the water flow on the pipe wall surface is maintained at a certain value (for example, 1.2 m / sec) or more, thereby preventing the adhesion of marine organisms.

[0007] 4) Use of a filter A filter having a smaller size than a shellfish egg (eg, 70 μm diameter) (this is also referred to as an ultrafine filter in the present specification) is used to filter a shellfish egg or the like. Capture the attaching larvae.

Various measures as described above have been attempted,
Has been put to practical use.

Therefore, the present inventors, for example, require periodic maintenance and inspection in the above method 3), and based on the idea of using a filter in the test stage of 4) above, As described above, seawater was filtered in order to capture in advance the larvae at the attachment stage such as eggs of shellfish floating in the seawater, and an attempt was made to use the filtered seawater as cooling water for the plant.

First, an outline of seawater utilization in a power plant will be described (Japanese Patent Application Laid-Open No. 60-80613, Japanese Patent Application Laid-Open No. 7-54).
328). In FIG. 7, in a general thermal power plant, steam worked in a turbine is condensed in a condenser 2A. For this condensation, seawater is used as cooling water. This seawater is withdrawn from the intake channel 1A.

That is, a bar rotary screen 3A and a traveling screen 4A are installed in the intake channel 1A, and the seawater from which the bulky trash in the seawater has been removed is removed by the intake pump 5A. Is lifted up to the condenser 2A via the seawater introduction pipe 6A, for example, about 4 to 10 kg /
Pumped in cm ² .

By the way, the larvae and the larvae that pass through the open-surface dust removing device such as the above-mentioned traveling screen 4A (this is also simply referred to as an open-channel filter in this specification) are located downstream of the seawater intake channel 1A. And adheres to the seawater inlet pipe 6A to form an adult shell, which falls off and clogs the thin tube of the condenser 2A.

For this reason, in the middle of the seawater introducing pipe 6A, a dust removing device for a pipe waterway (also referred to as a pipe water filter in this specification) 7
A is further provided to catch the dropped shellfish. In addition, a screen element (for example, a wedge wire) having an opening of about 5 to 10 mm is used for the pipe channel dust removing device 7A, and seawater is pressure-fed as described above in the seawater introduction pipe 6A. Therefore, the screen element is backwashed using the difference between the water pressure and the atmospheric pressure. Further, a branch pipe 8A is connected to the seawater introduction pipe 6A to cool, for example, a bearing 10A of a turbine via another pipe channel dust remover 9A.

[0014] As described above, generally, the open channel dust remover catches coarse dust, and the pipe channel dust remover catches minute dust.

[0015] However, since such a screen-pipe dust removing device 7A uses a screen element with a mesh size of 5 to 10 mm, it is very fine (eg, oversized garbage in the present specification). Ultra-fine garbage can be captured by a filter with a mesh size of about 5 to 10 mm, which is small enough to be captured by a dust remover. Since the garbage cannot be captured or filtered at all, use the drum type dust remover described in Japanese Patent Publication No. Hei 6-47048, which has already been proposed by the present applicant. I thought.

That is, the drum type dust remover includes a drum rotatably mounted on a shaft horizontally provided in a tank opened upward, an ultrafine filtration membrane attached to the outer periphery of the drum, and a drum. The end face is formed, a communication hole is formed on one end face, and a head plate having the other end face closed.
The raw water flowing from the communication hole flows through the ultra-fine filtration membrane and flows out to the peripheral side of the drum to capture the ultra-fine dust, and a surface washing nozzle is provided inside the drum, and a backflow nozzle is provided outside the drum. Thus, the ultrafine filtration membrane is washed.

Since the ultrafine filtration membrane can capture ultrafine waste, it can capture larvae at the attachment stage such as eggs of shellfish.

[0018]

However, if a drum type filtration device having such an ultra-fine filtration membrane is used to capture larvae at the attachment stage, such as eggs of shellfish, there are the following problems.

1) As described above, the seawater taken from the seawater intake channel does not include bulky trash, but includes fine trash and ultrafine trash (eg, eggs of shellfish), that is, trash having a large or small particle size. There is a possibility that the membrane may be damaged due to dust having a large particle size. Therefore, in addition to the drum type filtering device, as described in the same publication, a primary type of cylindrical bar screen is used. Requires a filtration device.

2) Since the drum type filtration device having such an ultrafine filtration membrane is not a pressurized filter similarly to the dust removal device for the open channel, the filtration speed is low, and thus a large ultrafine filtration membrane is required. In addition, other high-pressure water using a pump is required for the surface washing water and the backwashing water.

3) It is not provided in the middle of a seawater conduit or branch pipe for pumping seawater.

Therefore, it cannot be used in an apparatus for filtering larvae at the attachment stage, such as eggs of shellfish in seawater during pumping.

On the other hand, in a general dust remover for a pipe waterway, if clogging occurs in a filter element during operation, backwashing or face washing is performed using the difference between water pressure and atmospheric pressure (for example, And JP-A-53-62335).

That is, in a general pipe channel dust remover,
A single drum type filter is provided in the middle of the pipe, and is arranged perpendicular to the pipe. In particular, a type in which raw water is introduced into the inside of the drum and filtered water flows out from the outer periphery of the drum (for example, an actual type). In Japanese Patent Publication No. 54-33658, a backwashing mechanism and a discharge pipe for discharging bulky dust accumulated in the drum can be added. However, if a facewashing mechanism is added, the facewashing originally discharges bulky waste. Most of the raw water introduced into the drum will be used for surface washing only for the purpose, and it will be difficult to construct the surface washing during operation, that is, the continuous washing type. Therefore, both the backwashing mechanism and the surface washing mechanism will be provided. Can not do.

Therefore, as described above, the seawater intake channel 1A
The seawater taken and pumped from the sea contains both microscopic and ultrafine garbage (eg, shellfish eggs). If you try to capture both at the same time, the general single-body type Drum filters are not applicable.

That is, according to the experiments by the present inventors, when the range of the particle size of the dust is wide and the particle size to be removed is extremely fine, stable filtration cannot be realized only by the backwashing mechanism.
Multi-stage filtration is required, but from the knowledge that a single-stage filtration is possible by installing a surface washing mechanism and a backwashing mechanism in parallel, and removing ultra-fine dust by backwashing fine dust by top washing. However, there is a problem that the dust collecting device for a pipe channel including such a general single drum type filter cannot be applied.

[0027]

SUMMARY OF THE INVENTION Accordingly, the present invention aims to completely solve the above-mentioned problems, and the gist of the present invention is that 1) a seawater cooling system of a power plant and a shellfish Large-capacity one-stage for continuous filtration of seawater containing larvae and creatures at the attachment stage of larvae, ultrafine garbage composed of phytoplankton, and fine garbage having a larger particle size, and also capturing the ultrafine garbage For filtration type ultra-fine type pipe channel filter,
The main body of the filter is provided with an inlet and an outlet orthogonal to the direction of the inlet, and a front bearing on the inlet side and a rear bearing on a back plate side of the main body are provided in the main body. The rotating shaft is supported by these bearings, and the center of the supporting disk composed of a closing plate is fixed at the front and rear positions of the rotating shaft, respectively. By providing a cylindrical body penetrating in the front-rear direction, pressurized seawater as raw water from the inflow port is divided into the large number of small-diameter filtration element cylindrical bodies, and filtered seawater is caused to flow out from the outer periphery of the seawater. A backwash in which one of the cylinders for the small-diameter filtration element is rotated by using a multi-cylinder filtration element rotating continuous pressurized filtration machine which also captures the ultra-fine refuse. Place the front end of the cylindrical body tightly At the same time, a reciprocating sliding backwash tube is removably inserted into the cylindrical body, the front end of the backwash tube is closed, and a small backwash mouth is opened radially in the vicinity of the backwash tube. The back end of the backwash tube is opened to the atmosphere side via a backwash valve to constitute a local backwash mechanism for the cylindrical body, and the backwash mechanism removes the filtered ultrafine dust during a filtration step. A backwash mechanism for backwashing and removing with filtered seawater, and one of the cylinders for the small-diameter filtration element is rotating, and the outlet opening of the cylinder at the front washing part other than the reverse part is A flush water discharge pipe is provided coaxially with the cylindrical body, and the flush water discharge pipe is opened to the atmosphere side through a flush valve, to constitute a flush mechanism, and the super clean mechanism causes The fine garbage, which has a large particle size captured by the fine garbage, is washed with pressurized seawater as raw water during the filtration process. A super-cleaning type filter for filtering seawater, characterized by comprising a washing mechanism for removing seawater, and a sliding bearing provided with the washing water discharge pipe according to claim 1 on a back plate. A super-small filter for filtering seawater, which is provided so as to be slidable in the axial direction and connects / disconnects the washing water discharge pipe with the outlet opening of the cylindrical body for the small-diameter filtration element, and 3). The method for controlling an ultra-fine filter according to claim 1 is a control method for an ultra-fine filter which filters seawater to be subjected to washing or continuous washing by a timer at all times during the attachment stage of the larva. A brush is provided near the backwash mouth of the backwash pipe to filter seawater for improving backwash performance; and 5) a filter element is constituted by a cylindrical body, and an outlet of the cylindrical body is provided. Connect a washing water discharge pipe with a washing valve to the opening. , Continuous washing in which pressurized seawater as raw water is introduced from the inlet opening and filtered seawater flows out from the outer periphery of the cylindrical body,
And, in the continuous pressurized pipe channel filter, the washing water discharge pipe is connected to an air pressurized buffer tank, and when the buffer tank is depressurized, the washing valve is opened to wash the washing water into the buffer tank. A pipe channel filter for filtering seawater characterized by flowing in.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments, examples and application examples shown in the accompanying drawings.

FIG. 1 shows an embodiment of the present invention.
(A) is a front view, (B) is a side view, FIG. 2 is a second embodiment, (A) is a front view, (B) is a side view, and FIG. 3 is an embodiment of FIG. 4 is a detailed view of a portion A in FIG. 3, and FIG.
6 is an application example of FIG. 1, and a part of illustration and description of a part common to the conventional example shown in FIG. 7 is omitted.

The ultrafine filters F1 and F2 according to the first and second embodiments of the present invention are both attached to larvae in seawater in order to take measures against fouling of shells and the like in a seawater cooling system of a power plant. In this specification, a large capacity (for example, a maximum of 50 m ³ / sec) that can remove even fine particles (also referred to as ultrafine dust) can be removed.
The seawater filtered by this is suitable for the single-stage filtration type ultrafine filter of c), and the filtered seawater is used as a main unit of the seawater cooling system of the power plant 2A (see FIG. 7), It is used for various coolers (for example, turbine bearing cooling 10A) or evaporators (not shown).

First, the first and second embodiments will be outlined, and then the embodiments and application examples will be described in detail.

Ultra-fine filter according to the first embodiment
F1 belongs to a multi-tube (multi-cylinder) continuous pressure filter belonging to the so-called clarified high flow rate filtration, and in particular, FIG.
Is a so-called in-line type, which is provided in the middle of the branch pipe 8A, and is a so-called continuous washing type in which a filtration step and a washing step are performed simultaneously while passing water. And a backwash mechanism.

Therefore, it will be extremely effective if it is installed on the downstream side of the pipe channel dust removers 7A and 9A shown in FIG. That is, a name combination is formed.

In FIG. 1, this ultrafine filter F
The filter case body 1 (also simply referred to as the body) 2 is:
The inflow port 3 (this direction may be referred to as the upstream side or the front side) 3 coincides with the pipe axis of the branch pipe 8A, and the outflow port 4 is configured so as to be orthogonal to the so-called elbow type. Incidentally, the inflow port 3 and the outflow port 4 have openings of 610 mmφ, and the inflow port 3 is connected by expanding the branch pipe 8A in a funnel shape.

The radial ribs 5, 5,... At the front of the filter case body 2 and the back plate 6 at the rear form bearings 7, 8, respectively, and the rotary shaft 10 is formed by these bearings 7, 8. Supported. At the front and rear portions of the rotating shaft 10, the center portions of the supporting disks 12, 12 each composed of a closing plate are fixed, and a large number (about 8 to 15) of filtering elements are formed on these supporting disks 12. Small diameter (for example, 12
0 mmφ) cylindrical bodies 13 for filter elements (also referred to simply as small-diameter elements) are supported by penetrating in the front-rear direction.

That is, a large number of small-diameter element cylinders 13 are arranged side by side on one rotating drum. Incidentally, the axial length of the small-diameter element cylinder 13 is about 1000 mm to 1500 mm.

The filter element is made of SUS 70
Use is made of a combination of a μ wire mesh and a punching metal having an opening of 4 mmφ, which is welded, an ultrafine porous material such as a ceramic or sintered alloy having an opening of 70 μ or less, a wedge wire, or the like.

Therefore, the ultrafine filter F1
Can be said to be a multi-tubular filtration element rotary type.

Here, this ultrafine filter-F
1 is provided with the following backwashing mechanism 14 and front washing mechanism 15.

The backwashing mechanism 14 includes a seal pad (blocking plug) 17 for sealing the front end (inlet opening 38) of the cylindrical body at the backwashing portion 16 where one of the small-diameter element cylindrical bodies 13 rotates. The seal pad 17 is operated by an air cylinder (not shown in FIG. 1, but may be a motor ring or a cam type), and the coaxial back plate of the cylindrical body is provided. 6 is provided with a funnel-shaped backwash water discharge port 18 and a backwash valve provided in a backwash water discharge pipe line 23 connected thereto (a white valve is open and a black valve is closed in the figure). (The same applies hereinafter.) 19 to the atmosphere side.

The backwashing mechanism 15 includes a backwashing section 20 other than the backwashing section 16 where one of the small-diameter element cylinders 13 rotates. The same location, that is, the backwash water discharge pipe 23 and the front flush water discharge pipe 24 may be used in common. In this case, the backwash 6 and the backwash are not performed simultaneously. A washing water discharge port (outlet opening 46) is opened, and discharged to the atmosphere side through a washing valve 22 provided in a washing water discharge pipe 24 connected thereto.

Then, dust trapped on the same pipe axis can be flushed from the backwash water discharge port 18 and the outlet opening 46 at a stretch, and the so-called flow sweeping effect can be enhanced by utilizing the inertia of the flow. Can be.

An ultrafine filter according to the first embodiment.
Since F1 is configured as described above, the sequence control of various operations can be performed by including the following embodiments and application examples. For example, the following operations are performed.

The seawater as raw water from which coarse dust has been removed by the open channel dust remover (3A, 4A) is converted into pressure water of 4 to 10 kg / cm ² by the water intake pump 5A and continuously introduced into the ultrafine filter F1. After being divided into a large number of small-diameter element cylinders 13, 13... And filtered respectively, they are collected at an outlet 4 and introduced into a predetermined cooler.

At this time, a pressure difference (for example, a flow rate sensor may be added as needed, though not shown) installed on the inlet 3 side and the outlet 4 side of each filter element is provided. When 1 kgf / cm ² is detected, for example, the rotating shaft 10 rotatable at 4 rpm starts rotating, and when one of the small-diameter element cylinders 13 is rotated and positioned at the backwash portion 16, the rotating shaft is rotated. 10 is temporarily stopped, the inlet opening 38 (see FIG. 4) of the small-diameter element cylindrical body 13 is sealed with the seal pad 17, and the backwash valve 19 is opened.

As a result, the filtered seawater on the outer periphery of the small diameter element cylinder 13 flows back into the cylinder only through the ultra-fine holes due to the pressure difference from the atmospheric pressure,
Since it flows out to the backwash water discharge port 18 and is discharged to the atmosphere side,
The ultra-fine dust clogging the ultra-fine holes of the small-diameter element cylindrical body 13 and the fine or large-sized dust trapped and accumulated on the inner surface of the cylindrical body are discharged together with the backwash water and reversely discharged. Washing is performed.

In particular, since the inlet opening 38 is sealed, it is convenient for backwashing a filter element having an opening of 70 μm or less. In other words, since the backwash in the conventional filter is a local backwash, even if a so-called section chamber is formed, it is a slidable seal. In this embodiment, the backwashing effect is completely closed, and the backwashing is always performed through the ultrafine holes.

Next, the backwash valve 19 is closed and the seal pad 17 is opened, and then the rotating shaft 10 is rotated to backwash the next small diameter element cylinder 13.

On the other hand, the small-diameter element cylindrical body 13-1
When the one is rotated and positioned at the front washing portion 20, the rotating shaft 10 is temporarily stopped, and the front washing valve 22 is opened, so that the fine dust or the like trapped and deposited in the small diameter element cylindrical body 13 is reduced. Oversized garbage is flushed and discharged to the atmosphere side at a dash together with the surface washing water as raw water in the cylinder, and the surface is washed.

Of course, if the pressure sensor detects the water pressure, backwashing and facewashing may be performed simultaneously. Also, the number of times of backwashing may be made smaller than the number of times of backwashing, or the breeding time of the shellfish (larvae) During the adhering period (from May to July), cleaning by a timer or continuous cleaning may be performed at all times regardless of the detection by the pressure sensor.
In this way, the power plant is expected to operate without shellfish contamination for several years.

When the filter case body 2 is directed upward with respect to the pipe line on the downstream side and an elbow is connected to the outlet 4, the flows of the raw water and the filtered seawater are on the same pipe axis.

Next, an ultrafine filter F2 of the second embodiment will be described for reference. This ultrafine filter F2 is different from the above F1 in the following point. The same portions are denoted by the same reference numerals, and the description of the same or common portions will be omitted.

In FIG. 2, the rotary shaft 10 of the F1 fixing the support disk 12 is composed of a rotary shaft 25 and a hollow shaft 26, and the support disk 12 is loosely fitted on the rotary shaft 25. I support it. Therefore, it can be said that the ultrafine filter-F2 of the second embodiment is a multi-tubular element fixed type.

Therefore, a sealing arm 27 for supporting the seal pad 17 and the backwash water discharge pipe 2
3 is a radial backwash outflow channel 2 communicating with a hollow shaft 26 instead of 3
8 are rotatable. The hollow shaft 26 is provided with a backwash valve 19.

The washing water discharge port 21 of the washing part 20 on the back plate 6 is connected to the washing water discharge pipe 2 in the same direction as the outlet 4.
4 are connected.

Therefore, the ultrafine filter F2 of the second embodiment reduces the rotational power and improves the filtering performance by improving the sequence control as compared with the F1 filter. Let me.

Next, an example of the ultrafine filter F1 of the first embodiment will be described.

When the entire circumference of the small-diameter element cylinder 13 located at the backwashing portion 16 as described above is backwashed at once, since the backwash is performed by a pressure difference, the diameter of the small-diameter element cylinder is small. Although it is sealed with the pad 17, it is undeniable that the backwashing performance is insufficient. Therefore, this embodiment employs a local (sectional) backwashing mechanism to further enhance the backwashing performance.

That is, in FIG. 3, a slidable backwash tube 29 is inserted into the small-diameter element cylinder 13 which is rotated at the backwash portion 16 and one end of the backwash tube 29 is closed. A backwash section 31 having a small backwash mouth 30 opened in the radial direction is provided in the vicinity, and a sliding arm 32 is provided on the outer periphery of the other end. This slide arm 32
Is reciprocated by a compound air cylinder 33 constituting a long stroke (for example, 1050 mm). The other end of the backwash pipe 29 is open to the atmosphere via the backwash valve 19.

Therefore, according to this local backwash mechanism, the backwash pipe 29 is inserted into the small-diameter element cylinder 13 and the backwash valve 19 is opened and then slid from the downstream side to the upstream side. When the slide element is further slid back and forth, only the filter element in the portion where the small-diameter backwash mouth 30 is located is backwashed, that is, the backwash is locally performed and, consequently, large. The differential pressure increases the flow rate of the backwash water, and further improves the backwash performance even if dirt is bitten into the ultra-fine pores and is strongly clogged.

A brush (not shown), an ultrasonic transmitter, and a high-pressure air (or gas-liquid mixture) injection nozzle (not shown) are provided in the vicinity of the backwash mouth 30 and are operated immediately before the backwash so as to apply a forcing force to dust. When given, this backwashing performance is further improved.

In particular, since the larva in the attachment stage of the shellfish generates an impact force in combination with the backwashing, the shellfish does not adhere to the filter element itself.

In FIG. 3, reference numeral 34 denotes an intermediate slide bearing fixed to the back plate 6, which supports the backwash pipe 29 so as to be slidable in the axial direction. When the support disk 12 and the small-diameter element cylinder 13 are rotated by the rotary shaft 10, the backwash pipe 29 is pulled out from the right support disk 12 in FIG. 6 and waiting.

Reference numeral 35 denotes a motor, and reference numeral 36 denotes a transmission. The rotary shaft 10 is controlled and rotated by the motor 35.

Next, the seal pad 17 for backwashing and the washing water discharge pipe 24 in the embodiment of the first embodiment shown in FIG. 1 will be described in detail.

As shown in FIG. 4, the backwash seal pad 17 is opened and closed by pressing and separating a disc-shaped backwash seal plate 37 into an inlet opening 38 opened in the support disk 12. It is configured to be.

That is, this disc-shaped backwash seal plate 37
Of the push rod 40 is supported at the distal end side of the push rod 40, and the forward movement of the push rod 40 causes the inlet opening 38.
Is pressed and closed, and the push rod 40 is opened by returning.

The push rod 40 is supported by a front plate 41 of the filter case main body 2 via a slide bearing 42 for the push rod.
It is connected to. The air cylinder 43 is attached to a bracket 44 fixed to the push rod sliding bearing 42.

In FIG. 4, reference numeral 45 denotes a sliding packing for sealing the support disk 12 and the partition wall 46 of the filter case body 2.

Next, the washing water discharge pipe 24 will be described. In FIG. 5, a doughnut-shaped face-washing seal plate 45 is provided at one end of the flushing water discharge pipe 24.
The opening and closing of the outlet opening 46 opened in the supporting disk 12 by the metal plate 45 connects and disconnects the washing water discharge pipe 24 with and from the small diameter element cylindrical body 13. The flush water discharge pipe 24 is axially slidably supported by a flush water discharge pipe slide bearing 47 provided on the back plate 6, and a flush water valve 22 is provided at the other end. Actuation arc
The camera 48 is fixed.

The discharge pipe operating arm 48 is connected to a push rod 49, and the push rod 49 is moved back by the air cylinder 50. The air cylinder 50 is attached to a bracket 51 that supports the push rod 49.

In FIG. 5, reference numeral 52 denotes a pair of support discs 1.
Through bolts for connecting the support disks 12 and 12
And a sliding packing for sealing the partition wall 54 of the filter case body 2 with the sliding packing.

Next, an application example (optional equipment) of the ultrafine filter F1 of the first embodiment will be described.

In FIG. 6, a plurality of buffer tanks 55 for collecting bulky waste are branched and connected to the flushing valve 22 to increase the flushing flow rate and improve the flushing performance. At the same time, it prevents dewatering and recovery of bulky waste and reduction of raw seawater.

The plurality of buffer tanks 55 are constituted by sealed air pressurized tanks.
Is connected to a flushing water branch pipe 56 branched from the flushing valve 22 on the bottom side, and a dust pot 58 is detachably provided at the bottom of the bottom via a dust pot valve 57. A high-pressure air introduction valve 59 and a high-pressure air release valve 60 are provided. The garbage pot 58 is connected to a dehydrated filtrate collection pipe 61 and discharged to the atmosphere side, or is connected to the upstream side of the ultrafine filter F1.

In this application example, a plurality of buffer tanks 5
5, 55 ... are kept in a high-pressure air-filled state until just before the washing, and immediately after the washing valve 22 is opened, the high-pressure air releasing valve 60 is opened to rapidly reduce the pressure in the tank to buffer the washing water. Since it is introduced into the tank 55 at once, the washing speed is increased to improve the washing performance. In addition, it is possible to prevent wasteful outflow of flush water during the loss time from full opening to full closing of the flush valve 22.

Next, after closing the washing valve 22 and opening the dust pot valve 57, high-pressure air is introduced again into the buffer tank 55. The raw water is sent to the pot 58 under pressure, and only the raw water, which is the dehydrated filtrate, flows into the dehydrated filtrate recovery pipe 61, and the oversized garbage is accumulated in the trash pot 58. This garbage pot 5
When 8 is full, it is replaced with another garbage pot 58, and the full garbage pot 58 opens the bottom cover 62 to take out oversized garbage.

Note that the ultrafine filter F1,
The member constituting F2 is made of a corrosion and wear resistant material such as Ti and SUS. Of course, each valve and motor are controllable.

[0079]

According to the first aspect of the present invention, a large number of small-diameter filtration element cylinders are provided through a support disk fixed to a rotating shaft of a main body of a filter, and pressurized seawater as raw water is supplied to the cylinder. A multi-tubular filtration element rotating type that separates and allows filtered seawater to flow out from the outer periphery and capture even ultra-fine waste, and
A one-stage filtration type continuous pressurized pipe channel filter was provided with a local backwashing mechanism for a cylindrical body, which was used with one cylindrical body completely sealed, and a front washing discharge pipe provided on the other one of the cylindrical bodies. A separate washing mechanism is provided to stably filter a large amount of seawater containing both ultra-fine dust and fine dust. It can be used for water and the operation of the power plant can be free of fouling by shellfish.

In particular, the local backwashing chamber is sealed to avoid bypassing the micropores caused by leaks. Ultra-fine debris that has been cut into the micropores and clogged is removed by a simplified backwashing mechanism. Since it is flushed away by a water discharge pipe at a stretch, it can be washed continuously without using any special cleaning liquid, and it can be washed continuously with seawater as raw water and backwash with filtered seawater. The filter can be made more compact and configured as a filter for a pipe channel, and can be easily controlled, which is convenient for seawater withdrawal at a power plant.

According to the second aspect, in addition to the above, the washing water discharge pipe can be connected to and separated from the cylindrical body to be washed, and the washing speed can be increased by utilizing the inertia of the flow to improve the washing performance. Can be improved.

According to claim 3, in addition to the above, in particular,
The power plant can be operated without shell fouling for several years.

According to the fourth aspect, in addition to the above, the backwashing performance can be further improved.

According to the fifth aspect, the washing speed is improved by increasing the washing speed, and the collection of waste is improved.
In addition, a decrease in raw water can be prevented.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, wherein (A) is a front view and (B) is a side view.

FIG. 2A is a front view of the second embodiment,
(B) is a side view.

FIG. 3 is an embodiment of FIG.

FIG. 4 is a detailed view of a portion A in FIG. 3;

FIG. 5 is a detailed view of a portion B in FIG. 3;

FIG. 6 is an application example of FIG. 1;

FIG. 7 is a conventional example.

[Explanation of symbols]

F1, F2: Ultra-fine type filter, 13: Cylindrical body for small diameter element, 14: Backwash mechanism, 15: Front washing mechanism, 17
... Seal pad, 24 ... Washing water discharge pipe, 55 ... Buffer tank

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 29/11-29/96

Claims (5)

(57) [Claims] 1. Used in a seawater cooling system of a power plant, and
Ultra-fine larvae, larvae, and phytoplankton attached to shellfish
Includes fine dust and fine dust with a larger particle size
Continuous filtration of seawater to capture the ultra-fine waste
Large-capacity one-stage filtration type ultra-fine pipe channel filter, The main body of the filter has an inlet and a direction orthogonal to the direction of the inlet.
Outlets are provided respectively, and the inlet side is provided in the main body.
And a rear bearing on the back plate side of the main body.
The shaft is supported by these bearings, and before and after the shaft.
Fix the center of the supporting disk consisting of the closing plate
These support discs have a large number of small-diameter filtration elements.
By providing a cylindrical body for use in the front-rear direction,
The pressurized seawater, which is the raw water from the inlet, is filtered through the large number of small-diameter filters.
Dividing into the cylinder for the excess element
The ultra-fine debris in seawater
The multi-tubular filtration element rotary type
Using a continuous pressurized filter, the filter, One of the cylinders for the small-diameter filtration element rotates.
The front end of the cylinder at the backwash site
A backwashing tube that slides back and forth is removably inserted into the cylindrical body.
Then, the front end of the backwash tube is closed, and a small diameter is provided in the vicinity of the front end.
The backwash mouth is opened, and the back end of the backwash tube is used for backwashing.
Opening to the atmosphere side through a valve, the local
Constitute a backwashing mechanism, by the backwashing mechanism, the filtration ultra-fine
Waste is removed by backwashing with filtered seawater during the filtration process
Backwash mechanism, One of the cylinders for the small-diameter filtration element rotates.
The outline of the cylindrical body at the washing part other than the reverse part.
A flush water discharge pipe coaxial with the cylindrical body is installed in the
And open the flushing water discharge pipe to the atmosphere through the flushing valve.
To form a surface washing mechanism, and the surface washing mechanism
Filtration process of fine dust captured with large particle size by fine dust
Wash the inside with pressurized seawater as raw water and remove it at once
Filtering seawater characterized by having a washing mechanism and
Ultra-fine type filtration machine. 2. The washing water discharge pipe according to claim 1 is provided on a back plate.
By sliding bearing Provided to be slidable in the axial direction,
Connect the discharge pipe to the outlet of the cylinder for the small-diameter filtration element.
Ultra-fine filter that filters seawater that is connected to and separated from the opening
Overtime. 3. The method of claim 1, wherein the ultrafine filtration device is attached to
Timer cleaning or continuous cleaning at the time of raw adhesion
Of controlling an ultra-fine filter for filtering seawater. 4. A brush near the backwash mouth of the backwash tube according to claim 1.
Ultra-fine type that filters seawater to improve backwash performance by installing
Filtration machine. 5. A filter element comprising a cylindrical body, a washing water discharge pipe having a washing valve is connected to an outlet opening of the cylindrical body, and raw water is discharged from the inlet opening.
Upcoming introducing a pressurized圧海water was continuously washed to efflux filtered sea water from the cylindrical body periphery, and, in the continuous pressurized pipe waterways filter machine, the table wash water discharge pipe connected to an air pressure type buffer tank, A pipe channel filter for filtering seawater, characterized in that when the buffer tank is depressurized, the washing valve is opened to allow washing water to flow into the buffer tank.