JP3364301B2 - Filtration and desalination equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter desalting apparatus for the purpose of simplifying a membrane separating apparatus and a post-treatment apparatus by integrating a membrane separating module with a desalting apparatus.

[0002]

2. Description of the Related Art In condensate treatment of nuclear power plants and thermal power plants, a prefilter is installed to remove suspended impurities in the condensate, and a mixed bed ion exchange is performed to remove dissolved impurities. A bed or demineralizer is provided. On the other hand, a mixed bed type ion exchange layer, that is, a plant in which only a desalting device is installed is known, but in recent years, high purity is required due to the quality of treated water of condensate, and filtration and desalting are installed separately. Has been done.

By installing the pre-filter, the load on the clad to the desalting apparatus is reduced and the frequency of regeneration of the ion exchange resin is reduced. In order to reduce the regeneration frequency, a pressure precoat type filtration device that requires a filter aid is set in the prefilter.

However, since the pressure precoat type filter device uses a large amount of filter aid, the used filter aid is discarded when the filter is regenerated. In particular, nuclear power plants generate radioactive waste, and the current situation is that a great deal of money is spent on its disposal. Therefore, in the conventional example, a membrane separation device has been often used as a prefilter.

Recently, attention has been paid to the fact that the installation of a membrane separator reduces the clad load on the desalination unit, and the ion exchange resin of the desalination unit has been improved to carry out non-regeneration operation. The need for membrane separators is emphasized.

Further, by installing the membrane separation device, particularly in a thermal power plant, the quality of condensate water is improved, the number of times of chemical cleaning is reduced due to an increase in the differential pressure of the boiler, and the start-stop frequency is increased due to load fluctuations. It can be expected to reduce power consumption by shortening the start-up time.

[0007]

However, if a filter device as a filter is installed in the front stage and a desalting device is installed in the rear stage, a pump, a pipe and a valve are required for each unit operation. In addition, draining and venting pipes are required individually for routing the treated water inlet and outlet pipes for each equipment pipe, and for up and down.

Further, the equipment cost is doubled, such as make-up water necessary for operation of the apparatus, utility pipes for compressed air for on-site use and compressed air for instrumentation, etc. are individually required. There is a merit that can be enjoyed by installing it, but it cannot be obtained.

That is, when the devices are separated from each other, a control copper tube for driving instrumentation compressed air to the air-operated remote control valves used in these devices, a power cable for a switching solenoid valve, and a power source for a motor-operated valve are also used. Cable routing is obligatory for each device.

[0010] OPERATION control also route the signal cable for control by a single control panel to the individual devices, power supplies, respectively, need to be laid also signal cables to each of the remote control valve is there.

[0011] As described above, the individual installation of the devices causes the incidental equipment to swell more than double, and increases the construction cost, the operator load, the amount of utilities such as air and electricity used, and the running cost as well as the initial cost. The cost will also increase significantly.

[0012] Furthermore, in a unit such as an existing plant that does not have an installation space, the installation area is more than doubled, so that it is necessary to operate the desalination device alone as in the conventional example, and it is difficult to improve the water quality. There is.

The present invention has been made to solve the above-mentioned problems, and each device is integrated as a device, and its auxiliary equipment, that is, pipes, valves, and pumps are shared to reduce the installation space and cost. It is to provide a filter desalting device that can be easily measured and improved in water quality.

[0014]

SUMMARY OF THE INVENTION The present invention is a filtration desalination apparatus in which an apparatus body is vertically divided by a partition into a filtration section and a desalination section, wherein the filtration section is an upper portion of the apparatus body. And a plurality of hollow fiber membrane modules suspended from the tube sheet, a raw water introduction tube provided on a side wall of the apparatus body, and an upper lid of the apparatus body.
An outflow nozzle, and the desalination section is provided with an ion exchange resin layer provided at a lower portion of the apparatus main body and filtered water which is provided on a side wall of the apparatus main body and flows out from the outflow nozzle into the desalination section. The inflow nozzle, the lower water collecting pipe provided below the ion exchange resin layer, and the treated water discharge nozzle for discharging the ion exchange treated water collected in the lower water collecting pipe.

[0015]

In the filtration and desalination apparatus of the present invention, raw water containing suspended impurities (cladding) is supplied to the filtration section at the upper part of the apparatus main body and filtered by membrane separation in the hollow fiber membrane module. The filtered water flows into the upper chamber, flows from the outflow nozzle in the upper part of the device, through the external pipe, and into the sprinkler pipe in the desalination section in the lower part of the device body.

The treated water, which is supplied from the sprinkling pipe to the ion-exchange resin layer desalting in a downward flow to remove dissolved impurities and becomes highly pure, is discharged to the outside of the main body of the apparatus from the discharging means at the lower part of the apparatus. Thus, in the device of the present invention, filtration by membrane separation and desalting treatment by ion exchange can be performed by one device.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the filter desalting apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view schematically showing the filtration desalination apparatus of this embodiment. A hollow fiber membrane module is hung on a tube plate partitioning the upper part of the device main body above the device main body, and an ion exchange resin is formed on the lower part of the device main body.

FIG. 2 is a sectional view taken along line II-II of FIG.
4 is an air bubbling device for backwashing and cleaning the hollow fiber membrane module in a sectional view taken along the line III-III in FIG.
1 is a cross-sectional view taken along the line IV-IV in FIG. 1, showing a plan configuration of a sprinkling pipe for supplying filtered water to the ion exchange resin layer at the lower part of the device. FIG. 5 is a cross-sectional view taken along line VV of FIG. 1 and shows a plan configuration of a treated water collecting pipe.

In FIG. 1, reference numeral 1 indicates a filtration desalination apparatus main body, and the apparatus main body 1 is a filtration section A on an upper portion 2 of the apparatus.
And a desalting section B of the apparatus lower section 3, and a partition wall 4 is provided between the apparatus upper section 2 and the apparatus lower section 3 to separate the filtering section A and the desalting section B.

The inside of the upper part 2 of the apparatus is partitioned into an upper chamber 5 and a tube plate 7 that horizontally partitions the lower chamber 6. Its lower chamber 6
An inlet pipe 8 for raw water is provided on the side wall of the, and an outflow nozzle 9 for filtered water is provided on the upper lid of the upper chamber 5.

An inflow nozzle 10 for guiding filtered water to the desalination section B of the lower part 3 of the device is provided on the upper side wall of the lower part 3 of the device through an external pipe of the main body 1 of the device, which is connected from a filtered water outflow nozzle 9 of the upper part 2 of the device. A water sprinkling pipe 12 is provided for uniformly supplying the ion exchange resin layer 11 in a downward flow.

An intermediate water collecting pipe 13 is provided in the middle of the ion-exchange resin layer 11 to take out ion-exchange treated water in the ammonia cycle in the normal operation. It is provided on the side wall portion. Furthermore, in order to cope with seawater leaks, a lower water collecting pipe 15 for ion-exchanged treated water is provided at the lower part of the lower part 3 of the apparatus, and a treated water extraction nozzle 16 is provided at the bottom part.

The filtration chamber of the upper part 2 of the apparatus is composed of an upper chamber 5 and a lower chamber 6.
A plurality of hollow fiber membrane modules 17 are suspended in the lower chamber 6 by connecting the upper end side 17a of the hollow fiber membrane module 17 to the filtered water side of the upper chamber 5 in the tube plate 7 partitioned into 18 is fixed to the tube sheet 7. As shown in FIG. 3, an air bubbling pipe 19 is provided at the bottom of the lower chamber 6 so as to individually supply air for backwashing and cleaning to a plurality of hollow fiber membrane modules 17.

An air bubbling pipe 19 is provided on the side wall of the lower chamber 6.
A backwash valve, a weir 21, and a vent pipe 22 that communicate with the outside of the apparatus main body 1 are provided on the air supply nozzle 20 and its upper side wall. A cleaning drain pipe 23 is connected to the bottom of the lower chamber 6.

The cleaning drainage pipe 23 is for discharging the cleaning drainage containing the suspended impurities captured by the plurality of hollow fiber membrane modules 17 and removed by the backwash cleaning to the outside of the apparatus main body 1. The downstream side of the cleaning / drainage pipe 23 penetrates the partition wall 4, crosses the upper space of the desalting section B of the lower part 3 of the device, and penetrates the upper side wall of the lower part 3 of the device. The partition wall 4 is provided with a vent nozzle 24 for venting air above the lower part 3 of the apparatus.

An ion exchange resin inlet pipe 25 and a flushing water inlet pipe 26 are provided on the upper part of the lower part 3 of the apparatus, and an ion exchange resin outlet nozzle 27 is provided on the bottom part.
With this configuration, the height of the device body 1 can be reduced, and the device can be made compact.

In the above embodiment, the raw water containing suspended impurities is supplied from the introduction pipe 8. When this raw water permeates the hollow fiber membrane module 17, suspended impurities in the raw water are captured on the surface of the hollow fiber membrane, and it becomes filtered water to flow inside the hollow fiber membrane module 17 to the upper chamber 5. Inflow and outflow nozzle 9
Through an external pipe (not shown), enters the inflow nozzle 10 in the lower part 3 of the device, and is supplied to the filtered water sprinkling pipe 12.

As shown in FIG. 4, the sprinkler pipe 12 has a lower part 3 of the device.
A large number of the filtered water inflow nozzles 10 are arranged in parallel at right angles to each other. Filtered water is evenly sprayed from the water sprinkling pipe 12 so as not to disturb the surface 11a of the ion exchange resin layer 11, and the ion exchange treatment removes dissolved impurities by downward flow of water through the ion exchange resin layer 11. Then, the ion-exchange treated water is discharged from the intermediate water collecting pipe 13 and the treated water extracting nozzle 14.

Further, when a seawater leak occurs, further, through a water collecting pipe 15 provided below the intermediate water collecting pipe 13 ,
The ion-exchange treated water is discharged from the treated water extraction nozzle 16 at the bottom. A large number of water collecting pipes 15 are arranged in parallel as shown in FIG.

As the filtration process progresses, the backwash process performed when suspended impurities adhere to the membrane surface of the hollow fiber membrane and the filtration pressure difference increases, and the supply of raw water from the introduction pipe 8 is stopped. The pressurized gas is supplied from the air pipe connected to the outflow nozzle 9 to cause the filtered water in the upper chamber 5 to flow backward.

[0031] Accordingly, washing off the suspension concentrate impurities attached to the outside of the hollow fiber membrane module 17, further, by supplying air from the air supply <br/> supply nozzle 20 to the air bubbling tube 19, the hollow The hollow fiber membrane module 17 is pulsated by the air ejected as bubbles into the fiber membrane module protection cylinder 18 to separate suspended impurities.

The filtered water that flows back at this time is discharged to the outside of the apparatus main body 1 via the backwash vent weir 21 and the vent pipe 22. Further, since the air supplied from the air bubbling tube 19 hollow fiber membrane has a small extent that through the air to,
Similarly, it is discharged to the outside of the apparatus main body 1 via the backwash vent weir 21 and the vent pipe 22.

After that, from the bottom of the lower chamber 6, the cleaning drainage containing suspended impurities penetrates the partition wall 4 between the upper part 2 and the lower part 3 of the device to pass through the upper space of the lower part 3 of the device to be washed and discharged. It is discharged to the outside of the apparatus main body 1 by 23 .

On the other hand, the desalting section B of the lower part 3 of the device is the upper part 2 of the device.
Since the suspended impurities are removed by the filtration unit A of 1, the load is reduced. However, although it is expected that the frequency will be extremely low as compared with the filtration section A, when a differential pressure break occurs, the inflow of filtered water from the upper part 2 of the device is blocked by an external pipe (not shown) to the lower part 3 of the device. The supply to the inflow nozzle 10 is stopped.

Then, the resin is discharged from the resin outlet nozzle 27 at the bottom to the resin regenerator outside the apparatus main body 1 to regenerate the chemicals. The regenerated ion exchange resin again flows from the ion exchange resin inlet pipe 25 to form the ion exchange resin layer 11.

1 to 5 explain one embodiment of the present invention, and the present invention is not limited to the illustrated one as long as it does not exceed the gist of the present invention. Various modes can be adopted for the installation form, other introduction pipes, positions of discharge pipes, and the like.

However, it is not possible to construct a filter desalting apparatus in which the upper portion 2 of the apparatus main body 1 is the desalting portion B and the lower portion 3 is the filtering portion A with the upper and lower parts interchanged. This is because the membrane separation device replaces the membrane module that is a filter element for each service life thereof, and therefore the top of the membrane separation device must be opened.

If the lower part 3 of the device is used as a filtering part, the hollow fiber membrane module cannot be replaced from the upper part. Therefore, the device main body of this embodiment is turned upside down, and the replacement from the lower part is not performed. Become.

However, it is physically difficult to disassemble the filtration device from below. In addition, in replacement of the hollow fiber membrane module, due to its characteristics, it is necessary to fill the lower chamber 6 of the filtration unit A with water in order to prevent the hollow fiber membrane from being alienated. For this reason, the upper part 2 of the device main body 1 of this filtration and desalination device cannot be the desalting part B and the lower part 3 of the device cannot be the filtering part A.

[0040]

According to the present invention, since the filtration section of the hollow fiber membrane module and the desalting section of the ion exchange resin layer are integrated independently of each other, filtration by membrane separation can be performed by one device. Desalination treatment by ion exchange can be performed. Therefore, the installation area can be saved and the power consumption can be saved. As a result, even a unit with no installation space such as an existing plant can be installed, and pipes and valves are not required for each unit operation, so that a significant cost reduction can be achieved.

Particularly in a thermal power plant or the like, the quality of condensate water is improved, the number of times of chemical cleaning is reduced due to an increase in the differential pressure of the boiler, and the start-up time can be shortened due to an increase in the start-stop frequency for load fluctuation countermeasures Economic efficiency in plant operation such as power reduction effect can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a filter desalting apparatus according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a layer cross-sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV in FIG.

[Explanation of symbols]

1 ... Filtration desalination device main body, 2 ... Device upper part (filtration device part),
3 ... Lower part of the device (demineralization device part), 4 ... Device partition, 7 ... Tube plate, 8 ... Raw water introducing pipe, 9 ... Filtered water outflow nozzle, 10 ... Filtered water inflow nozzle, 11 ... Ion exchange resin layer, 12 ... Sprinkler pipe, 13
... Intermediate water collection pipe, 15 ... Lower water collection pipe, 14,16 ... Treatment water extraction nozzle, 17 ... Hollow fiber membrane module, 18 ... Protection pipe, 19 ... Air bubbling pipe, 20 ... Air supply nozzle, 21 ... Backwash vent weir , 22 ... backwash vent tube, 23 ... washings water pipe, 24 ... vent nozzle, 25 ... resin inlet pipe, 26 ... flushing water inlet pipe, 27 ... resin exit nozzle, A ... filtration unit, B ... desalting unit.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI C02F 1/42 C02F 1/42 A

Claims (4)

(57) [Claims] 1. A filtration desalination apparatus in which an apparatus main body is vertically divided by a partition into a filtration section and a desalting section, wherein the filtration section includes a tube plate provided at an upper portion of the apparatus main body. a plurality of hollow fiber membrane module of this hung from the tube plate, a raw water inlet pipe in the side wall of the apparatus main body, before
Equipped with an outflow nozzle provided on the upper lid of the device main body,
The demineralization section includes an ion-exchange resin layer provided at a lower portion of the apparatus body, an inflow nozzle provided on a side wall of the apparatus body, into which filtered water flowing out of the outflow nozzle flows into the deionization section, and the ion. A filter desalination apparatus comprising: a lower water collecting pipe provided below the exchange resin layer; and a treated water discharge nozzle for discharging the ion-exchange treated water collected in the lower water collecting pipe. 2. The hollow membrane module is provided on the partition wall.
And washings water pipe for discharging the backwash cleaning waste water into the apparatus main assembly outside
It said filter demineralizer according to claim 1, wherein the vent nozzle for discharging air staying in the upper part of the desalination unit, characterized in that it is provided. 3. The hollow membrane module is provided in the filtration unit.
Air to remove suspended impurities during backwashing
For supplying air and backflow during the backwashing
The filtration desalination apparatus according to claim 1, further comprising a backwash vent pipe for discharging the filtered water . 4. The ion exchange resin layer is provided in the desalting section.
Exchange in the ammonia cycle during normal operation of
Intermediate water collecting pipe for taking out treated water, and the ion exchange resin layer
Ion exchange with the resin inlet pipe that supplies ion exchange resin to the
It filter demineralizer according to claim 1, wherein the resin outlet nozzle for discharging the exchange resin into the apparatus main assembly outside is provided.