JP2004290749A - Method and apparatus for treating wastewater of condenser water pressure test - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To redcuce the production cost of pure water (replenishing water or test water) by recycling wastewater obtained after a condenser water pressure test. <P>SOLUTION: This treatment apparatus 1 is equipped with a recovery pipe 10 for recovering the wastewater of the condenser water pressure test from a drain means 50, a wastewater purifying device 20 for removing impurities contained in the wastewater of the condenser water pressure test recovered by the recovery pipe 10 and a treated water supply pipe 30 for supplying treated water, which is obtained by treating the wastewater of the condenser water pressure test and from which impurities are removed by the wastewater purifying device 20, to a pure water making apparatus. The wastewater of the condenser water pressure test discharged heretofore is treated to be supplied to the pure water making apparatus before recycled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method and a device for treating wastewater (condenser hydraulic test drainage) generated by a condenser hydraulic pressure test performed at the time of checking a condenser in a power plant. In this specification, the term “power generation plant” includes not only thermal power plant equipment and nuclear power plant equipment, but also private power generation equipment installed in factories and the like.
[0002]
[Prior art]
For example, in a thermal power plant, steam generated by a boiler is sent to a turbine, a turbine rotates a generator to generate electricity, and the steam after power generation is cooled by a condenser and sent to a condensate treatment unit as condensate. After removing impurities such as suspended substances such as iron clad and various ion components such as Na ions and Cl ions generated from piping materials such as boilers and piping such as piping (FIG. 7). reference). In a pressurized water nuclear power plant (PWR), steam generated by a steam generator is sent to a turbine, a turbine is used to rotate a generator to generate power, and the steam generated is cooled by a condenser to be condensed. After being sent to the condensate treatment unit and purified in the same manner as above, it is repeatedly used. Also, in any of the power plants, as shown in FIG. 7, a pure water production apparatus including a pure water apparatus is installed in a stage preceding the condenser to purify raw water such as industrial water and city water. Pure water is produced and supplied to the condenser as makeup water.
[0003]
It is necessary to inspect each device constituting the above-described power plant at a predetermined timing. In the condenser inspection, the condenser outlet valve is closed, the pure water produced by the pure water production device is filled in the condenser as test water, and the condenser pump is driven to a predetermined water pressure. A water pressure test is performed to detect a leak location based on the presence or absence of a change in water pressure. After the test, the test water filled in the condenser in the hydraulic pressure test is transferred to a drainage means having a drainage storage tank by opening an outlet valve as a condenser hydraulic test drainage, and then to a drainage treatment device. Is discharged and discharged (see FIG. 7).
[0004]
[Problems to be solved by the invention]
As described above, at present, the condenser hydraulic test drainage generated during the inspection of the condenser is simply discharged. Emissions of such condenser pressure test effluent, for example, in thermal power plants 30~100kW level, is about 500 to 1000 m ³ per hydrostatic test, net amount of test water corresponding to the emissions Manufacturing with water equipment requires considerable manufacturing costs. Also, when discharging the condenser hydraulic test drainage, it is necessary to treat the wastewater to a predetermined water quality value, and the cost required for such wastewater treatment is large.
The present invention has been made in view of the above, and treats and reuses conventionally discharged condenser hydraulic test drainage water to produce pure water (supplementary water) produced in a pure water production apparatus including a pure water apparatus. It is a first object of the present invention to provide a method and an apparatus for treating condenser hydraulic test wastewater, which reduce the production cost of wastewater and test water) and wastewater treatment cost.
[0005]
On the other hand, the condenser hydraulic test drainage is an unsteady drainage that occurs only at the time of inspection once or twice a year or several years, unlike the steady drainage that is constantly discharged with the normal operation of the power plant. . Therefore, in order to reduce the cost of producing the test water and the cost of treating the wastewater, even if a means for treating and reusing the condenser hydraulic test wastewater is used, such means is not used during normal operation of the power plant. It is completely unnecessary, and in view of the space occupied by such means, construction costs, and maintenance costs, it is not worthwhile to install them permanently.
Therefore, a second object of the present invention is to provide a condenser hydraulic test wastewater treatment apparatus suitable for being installed in a power plant only at the time of inspection of a condenser.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention according to claim 1, a step of collecting condenser hydraulic test wastewater generated by a hydraulic test performed when inspecting a condenser of a power plant;
Removing the impurities contained in the condenser hydraulic test wastewater,
Supplying the treated water of the condenser pressure test wastewater from which impurities have been removed by the above-mentioned steps to a pure water production apparatus.
According to the second aspect of the present invention, in the step of removing the impurities, the impurities are removed by a filtration treatment and an ion exchange treatment, and thereafter, the treated water is supplied to a subsequent stage of the pure water apparatus in the pure water production apparatus. A method for treating condenser hydraulic test wastewater according to claim 1, characterized in that:
According to a third aspect of the present invention, in the step of removing the impurities, the impurities are removed only by a filtration process, and then the treated water is supplied to a stage preceding the pure water apparatus in the pure water production apparatus. A method for treating the condenser hydraulic test wastewater according to claim 1.
According to the present invention as set forth in claim 4, a condenser is provided between a drainage means of a hydraulic pressure test drainage generated by a hydraulic pressure test performed at the time of inspection of the condenser of the power plant and a pure water production apparatus,
A collecting pipe for collecting condenser hydraulic test wastewater from the drainage means,
A drainage purification device that removes impurities contained in the condenser hydraulic test drainage collected from the collection pipe,
A treatment water supply pipe for supplying treated water of the condenser pressure test wastewater from which impurities have been removed by the wastewater purification device to a pure water production device, wherein the treatment of the condenser hydraulic test wastewater is performed. Provide equipment.
According to the fifth aspect of the present invention, the recovery pipe is connected to and detachable from a drainage means of a condenser hydraulic test drainage, and the treated water supply pipe is connected to and disconnected from a pure water producing apparatus. Is provided as possible,
5. The apparatus for treating a condenser hydraulic test wastewater according to claim 4, wherein the recovery pipe, the wastewater purification apparatus, and the treated water supply pipe constitute one unit and can be transported.
In the present invention according to claim 6, the wastewater purification device is configured to include a membrane filtration device and an ion exchange device,
The treated water supply pipe is used by being connected to the subsequent stage of the pure water apparatus in the pure water production apparatus, and is capable of supplying treated water of a condenser hydraulic test drainage from which both suspended substances and ionic components have been removed. An apparatus for treating condenser hydraulic test wastewater according to claim 4 or 5, characterized in that:
In the present invention according to claim 7, the waste water purification device is configured to include a membrane filtration device having a filter for removing suspended substances,
The treated water supply pipe is used by being connected to a preceding stage of a pure water apparatus in a pure water producing apparatus, and is capable of supplying treated water of a condenser hydraulic pressure test wastewater from which only suspended substances have been removed. An apparatus for treating a condenser hydraulic test wastewater according to claim 4 or 5 is provided.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram showing a condenser hydraulic test wastewater treatment apparatus 1 according to one embodiment of the present invention. As shown in FIG. 1, the treatment apparatus 1 includes a recovery pipe 10, a wastewater purification apparatus 20, and a treated water supply pipe 30.
[0008]
The recovery pipe 10 has a connection valve 11 at one end, and the other end is connected to the membrane filtration device 21 of the wastewater purification device 20. The connection valve 11 is provided so as to be connected to and removable from a drainage water supply pipe 53 constituting the drainage means 50 of the condenser hydraulic test drainage. The drainage means 50 for the condenser hydraulic test drainage includes a drainage storage tank 51 for storing the condenser hydraulic test drainage drained through a drainage pipe 60 provided in the condenser. The water supply pipe 53 is disposed between the drainage storage tank 51 and the recovery pipe 10, and supplies the condenser hydraulic test water in the drainage storage tank 51 to the recovery pipe 10 by driving the water supply pump 52. It is.
[0009]
The wastewater purification device 20 includes a membrane filtration device 21 and an ion exchange device 22. The membrane filtration device 21 captures and removes suspended substances such as iron clad among impurities contained in the condenser hydraulic test drainage, and includes, for example, a pleated filter, a wound filter, a hollow fiber membrane, and the like. Used ones. In the present embodiment, as shown in FIG. 2, a plurality of filters 21b provided with a filter medium such as a pleated filter are provided in a tower 21a. In FIG. 2, a plurality of filters 21b are connected in the vertical direction, and a plurality of connected filters are supported on the support plate in the tower 21a. The number of tubes connected in the vertical direction when connected, or the number of tubes connected to the support plate is appropriately selected depending on the amount of wastewater from the condenser hydraulic test water to be treated. Also, the number of the membrane filtration devices 21 is appropriately selected depending on the water quality, the treatment amount, and the like of the condenser hydraulic test drainage.
[0010]
The ion exchange device 22 is disposed to be connected to the above-mentioned membrane filtration device 21 via a pipe 24 having a valve 23. As the ion exchange device 22, for example, a mixed bed type filled with a cation exchange resin and an anion exchange resin is used, and various ion components such as Na ions and Cl ions are removed by ion exchange. The number of the ion exchange devices 22 is not limited as in the case of the membrane filtration device 21 described above, and is appropriately selected according to the water quality, the treatment amount, etc. of the condenser hydraulic test drainage to be treated.
[0011]
A treated water supply pipe 30 for discharging treated water is connected to the ion exchange device 22. A connection valve 31 is provided at an end of the treated water supply pipe 30, and can be connected to and detached from a pipe (not shown) of the pure water producing apparatus. In the present embodiment, the waste water purifying device 20 has a membrane filtration device 21 and an ion exchange device 22, and is configured to remove both suspended substances and ionic components. The test water used for the water pressure test of the condenser uses pure water produced by the pure water equipment of the pure water production equipment as described in the section of “Prior Art” and passes through the inside of the condenser. The water is drained to the above-mentioned drainage means 50 only by doing so. For this reason, the turbidity of the condenser hydraulic test wastewater itself is originally low, and the treated water of the condenser hydraulic test wastewater treated by the membrane filtration device 21 and the ion exchange device 22 is pure water provided in the pure water production device. The water quality is almost equal to or higher than the quality of pure water produced by the equipment. Therefore, in the present embodiment, the treated water obtained through the membrane filtration device 21 and the ion exchange device 22 is supplied to a pure water tank or a makeup water tank disposed at a subsequent stage of the pure water device. The connection valve 31 of the treated water supply pipe 30 is connected and used.
[0012]
It is preferable that the above-described recovery pipe 10, the wastewater purification apparatus 20, and the treated water supply pipe 30 are configured as one unit, and have a structure capable of transporting the treatment apparatus 1 including these. For example, when the drainage purification device 20 has one membrane filtration device 21 and four ion exchange devices 22, they are arranged in a layout as shown in FIG. In addition, a structure mounted on the skid 40 can be adopted. As described above, the recovery pipe 10 is provided with the connection valve 11 which can be connected to and detached from the drainage means 50, and the treated water supply pipe 30 is provided with the connection valve 31 which can be connected to and removed from the pure water producing apparatus. Is provided. Therefore, if the skid 40 is carried to a predetermined location and the connection valves 11 and 31 are connected, the condenser hydraulic test drainage can be treated.
[0013]
As described above, the water pressure test of the condenser is only performed at the time of inspection performed once or twice a year or several years. For this reason, the condenser hydraulic test drainage treatment apparatus 1 does not need to be permanently installed, and can be transported as in the present embodiment in consideration of securing a space for permanent installation, installation costs, maintenance costs, and the like. It is preferable to adopt a structure that can be transported and arranged only when the water pressure test is performed. In a power plant having a plurality of condensers, a plurality of condensers are not subjected to the water pressure test at the same time. When testing any condenser, for example, only one processing unit 1 can deal with it, and it is far more cost-effective than the case where the processing unit 1 is permanently installed for each condenser. It is.
[0014]
Next, a method for treating condenser hydraulic test wastewater using the treatment apparatus 1 of the present embodiment will be described. First, after being transported to a predetermined location, the processing apparatus 1 of the present embodiment connects the connection valve 11 of the recovery pipe 10 to the drainage water supply pipe 53 of the drainage means 50 as shown in FIGS. 1 and 4. At the same time, the connection valve 31 of the treated water supply pipe 30 is connected to a pipe connected to a pure water tank or a make-up water tank arranged at a later stage of the pure water apparatus and is disposed (in FIG. 4, a solid line indicates a pure water tank). And the imaginary line shows the connection to the makeup water tank).
[0015]
Then, a condenser water pressure test is performed. The condenser water pressure test closes the outlet valve attached to the condenser drain pipe, supplies pure water produced by the pure water device into the condenser as test water, and makes the condenser full. Water pressure is applied, and the presence or absence of leakage is detected by a change in pressure. After the test, the outlet valve of the drain pipe 60 is opened, and the water is discharged into the drainage storage tank 51. The timing of disposing the treatment apparatus 1 is not limited to the time before the condenser hydraulic pressure test is performed as described above, and the condenser hydraulic pressure test is performed, and the condenser hydraulic pressure test drainage is discharged to the drainage storage tank 51. It may be after storing.
[0016]
When treating the condenser hydraulic test drainage discharged into the drainage storage tank 51, the water supply pump 52 is driven to send the wastewater to the collection pipe 10 through the drainage water supply pipe 53. The condenser hydraulic test drainage that has passed through the recovery pipe 10 is first filtered by a membrane filtration device 21 to remove suspended substances such as iron clad. Next, the water is sent to the ion exchange device 22 via the pipe 24, ion components are removed by ion exchange, sent to the treated water supply pipe 30 as treated water, and passed through the pipe connected to the treated water supply pipe 30. , Returned to the pure water tank or make-up water tank. The treated water returned to the pure water tank or make-up water tank has a water quality substantially equal to or higher than the pure water (make-up water) produced by the pure water tank and stored in the pure water tank or make-up water tank. Therefore, it can be used as it is as makeup water used during normal operation of the power plant.
[0017]
As a result, make-up water required during normal operation can be replenished with the treated water of the condenser hydraulic test drainage water, and the amount of pure water (make-up water) produced by the pure water device and the production load can be reduced. (Replenishing water) production cost can be reduced. Similarly, when using pure water (make-up water) as test water for inspection of other equipment or other condensers, reduction of the production cost of pure water (make-up water) as test water, etc. Can be planned.
The turbidity may be high in the initial stage of discharge of the condenser hydraulic test drainage water. Therefore, the condenser hydraulic test drainage is discharged to another storage tank (not shown) through the line 61 shown in FIG. 1 in the initial stage of discharge, and after the turbidity has decreased to some extent, the line is switched to the drainage storage tank 51. In some cases, it is preferable to adopt a configuration for discharging. Thereby, the processing load on the processing apparatus 1 can be reduced, and the apparatus can be made compact. In addition, even with such a configuration, the amount of high-turbidity drainage in the initial stage of discharge is extremely small compared to the entire amount of the condenser hydraulic test drainage, so that the amount of water that can be reused does not significantly decrease.
[0018]
Next, another embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 5, the treatment apparatus 100 of the present embodiment is the same as the above embodiment in that the treatment apparatus 100 is configured to include a recovery pipe 110, a wastewater purification apparatus 120, and a treated water supply pipe 130. The configuration of the wastewater purification device 120 is different. That is, the wastewater purification device 120 of the present embodiment includes only the membrane filtration device 121 and does not include the ion exchange device. Therefore, the condenser hydraulic test wastewater treated in the wastewater purification device 120 via the recovery pipe 110 is treated water in which only suspended substances such as iron clad are removed by the membrane filtration device 121 and impurity ion components remain. Is supplied from the treated water supply pipe 130 to the pure water production apparatus.
[0019]
When treating the condenser hydraulic test drainage using the treatment apparatus 100 of the present embodiment, as shown in FIGS. 5 and 6, the collection pipe 110 is connected to the drainage means 50 in the same manner as in the above embodiment. On the other hand, the treated water supply pipe 130 is connected via a pipe to a stage preceding the pure water apparatus in the pure water production apparatus. In the pure water production equipment, a pretreatment device such as a membrane filtration device is installed in front of the pure water device. After filtering raw water such as industrial water and city water to remove suspended substances, the pure water Supplying. As described above, the wastewater purification device 120 of the treatment device 100 includes only the membrane filtration device 121 and does not include the ion exchange device as described above. Impurity ion components remain in the treated water after the treatment, which is inferior to the quality of pure water produced by the pure water apparatus. For this reason, it is not preferable to connect the treated water supply pipe 130 to the subsequent stage of the pure water apparatus as in the above-described embodiment and use the treated water supply pipe 130 as it is as pure water (supply water).
[0020]
However, the treated water treated by the wastewater purification device 120 of the present embodiment has a water quality almost equal to or higher than the water quality of the outlet water of the pretreatment device of the pure water production device. Therefore, as shown by the solid line in FIG. 6, by connecting the treated water supply pipe 130 at a stage before the pure water apparatus and with the pretreatment apparatus via a pipe, the throughput in the pure water apparatus can be reduced. It can be replenished with the treated water of the condenser hydraulic test drainage that has passed through the treatment apparatus 100 of the present embodiment, reduces the processing load (treatment amount) of the raw water in the pretreatment apparatus, and includes pure water including the pretreatment apparatus and the pure water apparatus. It is possible to reduce the production cost of pure water (replenishment water) produced in the production apparatus. In addition, the frequency of regeneration treatment of the pre-treatment unit and the pure water unit can be reduced, and the amount of wastewater and suspended solids coming out of each unit is reduced, thus reducing the processing load on the wastewater treatment equipment installed at the subsequent stage. can do.
[0021]
Further, in the case of the treatment apparatus 100 of the present embodiment, as shown by an imaginary line in FIG. 6, the treated water supply pipe 130 is connected to a raw water tank, a pipe, or the like that is installed further upstream than the pretreatment apparatus. You can also. In this case, the raw water is diluted by the treated water from which suspended substances have been removed in the treatment device 100, so that the processing load on the pretreatment device can be reduced. As a result, the production cost of pure water can be reduced, and pretreatment can be reduced. It is possible to reduce the frequency of regeneration processing of the apparatus and the pure water apparatus.
In addition, since the turbidity may be high in the initial stage of discharge of the condenser hydraulic test wastewater, the condenser hydraulic test wastewater is also separated through the line 61 shown in FIG. It is preferable to discharge to the drainage storage tank 51 after the turbidity is reduced to some extent.
[0022]
Further, in the case of the treatment apparatus 100 of the present embodiment, since the waste water purification device 120 is configured to include only the membrane filtration device 121, the size of the skid on which these components are mounted is reduced as compared with the above embodiment. And the work load during transportation can be further reduced.
[0023]
【The invention's effect】
INDUSTRIAL APPLICABILITY The method and apparatus for treating a condenser hydraulic test wastewater of the present invention can treat a condenser hydraulic test wastewater that has been conventionally discharged, supply it to a pure water production apparatus, and reuse it. Therefore, it is possible to reduce the production cost of pure water (supplementary water and test water) produced in the pure water production apparatus including the pure water apparatus, and to eliminate the cost of drainage treatment of the condenser hydraulic test wastewater. be able to.
In particular, as a wastewater purification device to be incorporated in the treatment device of the present invention, a wastewater purification device provided with a membrane filtration device and an ion exchange device is used. Water or test water), reducing the load on the pure water apparatus and reducing the cost of pure water production. Further, in the case of using a device provided with a membrane filtration device as a wastewater purification device incorporated in the treatment device of the present invention, by returning the treated water obtained by the membrane filtration device to a stage preceding the pure water device, The load on the pure water device and the pretreatment device can be reduced, and the cost of producing pure water and the frequency of regeneration treatment of the pure water device can be reduced.
In addition, since the treatment device of the present invention has a structure capable of being transported, it can be installed at a predetermined location only when checking the condenser, and during normal operation, it is not necessary to secure an occupied space of the treatment device, It can be effectively used for other purposes.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a configuration of a condenser hydraulic test wastewater treatment apparatus according to one embodiment of the present invention.
FIG. 2 is a schematic diagram showing a structure of a membrane filtration device used in a condenser hydraulic test wastewater treatment apparatus according to the one embodiment.
FIG. 3 is a schematic plan view showing a condenser hydraulic test wastewater treatment apparatus according to the embodiment of the present invention in which a wastewater treatment device and the like are mounted on a skid.
FIG. 4 is a treatment system diagram of a condenser hydraulic test drainage in a power plant using the treatment apparatus according to the one embodiment.
FIG. 5 is a schematic diagram showing a configuration of a condenser hydraulic test wastewater treatment apparatus according to another embodiment of the present invention.
FIG. 6 is a system diagram of a condenser hydraulic test drainage in a power plant using the processing apparatus according to the other embodiment.
FIG. 7 is a treatment system diagram of a conventional condenser hydraulic test drainage in a power plant.
[Explanation of symbols]
1,100 Treatment equipment 10,110 Recovery pipe 20,120 Waste water purification equipment 21,121 Membrane filtration equipment 22, Ion exchange equipment 30,130 Treated water supply pipe 50 Drainage means 51 Drainage storage tank

Claims (7)

Collecting a condenser hydraulic test drainage generated by a hydraulic test performed when inspecting the condenser of the power plant;
Removing the impurities contained in the condenser hydraulic test wastewater,
Supplying the treated water of the condenser hydraulic test wastewater from which impurities have been removed by the above-mentioned step to a pure water production apparatus. The method according to claim 1, wherein in the step of removing the impurities, the impurities are removed by a filtration treatment and an ion exchange treatment, and then the treated water is supplied to a subsequent stage of the pure water device in the pure water production device. Condenser hydraulic test wastewater treatment method. 2. The condenser according to claim 1, wherein in the step of removing the impurities, the impurities are removed only by a filtration process, and thereafter, the treated water is supplied to a stage preceding the pure water apparatus in the pure water producing apparatus. Hydraulic test wastewater treatment method. Provided between the drainage means of the condenser hydraulic pressure test drainage generated by the hydraulic pressure test carried out when inspecting the condenser of the power plant and the pure water production equipment,
A collecting pipe for collecting condenser hydraulic test wastewater from the drainage means,
A drainage purification device for removing impurities contained in the condenser hydraulic test drainage collected from the collection pipe,
A treatment water supply pipe for supplying treated water of the condenser pressure test wastewater from which impurities have been removed by the wastewater purification device to a pure water production device, wherein the treatment of the condenser hydraulic test wastewater is performed. apparatus. The recovery pipe is connected / removable to a drainage unit of a condenser hydraulic test drainage, and the treated water supply pipe is connected / removable to a pure water production apparatus,
The apparatus according to claim 4, wherein the recovery pipe, the wastewater purification device, and the treated water supply pipe constitute one unit and can be transported. The wastewater purification device is configured to include a membrane filtration device and an ion exchange device,
The treated water supply pipe is used by connecting it to the subsequent stage of the pure water apparatus in the pure water production apparatus, and is capable of supplying treated water of a condenser hydraulic test drainage from which both suspended substances and ionic components have been removed. The treatment device for condenser hydraulic test wastewater according to claim 4 or 5, wherein: The wastewater purification device is provided with a membrane filtration device having a filter for removing suspended substances,
The treated water supply pipe is used by being connected to a front stage of a pure water apparatus in a pure water producing apparatus, and is capable of supplying treated water of a condenser hydraulic pressure test wastewater from which only suspended substances have been removed. The apparatus for treating condenser hydraulic test wastewater according to claim 4.

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