JP2011020010A - Formation water producing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a formation water producing apparatus for producing water by an RO (reverse osmosis) method, wherein the increase in the capacity of a storage battery is suppressed even when the supplied electric energy varies. <P>SOLUTION: The formation water producing apparatus is provided with: a first pressurizing part 2A pressurizing raw water; a first reverse osmosis membrane part 3A filtering the pressurized raw water to form intermediate water; a second pressuring part 2B pressurizing the intermediate water; a second reverse osmosis membrane part 3B filtering the pressurized intermediate water to form the formation water; an intermediate water tank 4 disposed between the first reverse osmosis membrane part 3A and second pressuring part 2B and storing the filtered intermediate water; a solar battery panel 5 generating power; a storage battery 7 storing the generated power; and a control part 9 supplying at least a part of the generated power to the storage battery 7, reducing the supply amount of power to any one of the first pressurizing part 2A or second pressuring part 2B when the amount of insolation reduces from a prescribed value, and keeping the supply amount of the power to the other part constant. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a produced water production apparatus using a reverse osmosis method, and more particularly to a produced water production apparatus that produces fresh water using electric power generated by a solar cell module.

The produced water production apparatus using the reverse osmosis (RO) method is a method in which a reverse osmosis membrane is housed in a pressure-resistant vessel, and seawater or brine is applied with a pressure equal to or higher than the osmotic pressure to obtain fresh water. It has been used conventionally. Various methods of operating using renewable energy have been proposed as a power source for applying a pressure higher than the osmotic pressure (see, for example, Patent Documents 1 to 3).
Especially in depopulated areas and dry areas where the population is small and infrastructure such as power transmission facilities is not established, if the reverse osmosis membrane device can be operated with a renewable energy source without relying on external power, it can be reversed to various areas such as remote islands. The osmotic membrane device can be easily spread.

  Patent Document 1 describes a technique for operating a generated water production apparatus using electric power generated by a solar cell module, collecting rainwater received by the solar cell module in a raw water tank, and using it for desalination.

  Patent Document 2 discloses a technique for operating a seawater desalination apparatus using electric power generated by a wind power generator and changing the number of seawater desalination apparatuses operated in advance with respect to the amount of power generated by the wind power generator. Further, there is described a technique for improving seawater desalination efficiency in a seawater desalination apparatus by heating seawater using surplus power.

  In Patent Document 3, the reverse osmosis membrane device is operated using the power generated by the solar cell module or the wind power generator, and the power used for driving the reverse osmosis membrane device is supplemented by the power stored in the storage battery. A technique of using a solar cell module as an awning of a reverse osmosis membrane device is described.

JP-A-7-68257 JP 2000-202441 A JP 2004-41887 A

  In general, the RO method is a method for obtaining fresh water by desalting seawater and the like by storing it in a pressure-resistant vessel equipped with a reverse osmosis membrane and applying a pressure of osmotic pressure (about 2.5 MPa in the case of seawater) or more. However, it is also used to improve the quality of water and middle water.

There is a proposal to construct a device for desalinating seawater using the electric power obtained by solar cell power generation in a place with good sunshine conditions, such as near the coast, for this generated water production device using the RO method. Proposed.
However, in the case of desalination using the RO method, it takes a long time to produce fresh water from seawater or the like, and during this time, avoid rapid changes in reverse osmosis pressure (about 5 MPa to 8 MPa) applied to seawater or the like. It is desirable.

  In power generation using a solar cell module, the amount of power generation changes due to the effects of sunshine fluctuations. For this reason, when the pump is directly driven by the electric power accompanied by the change to generate the reverse osmosis pressure, the reverse osmosis pressure also changes due to fluctuations in sunlight, so that the performance of the reverse osmosis membrane is deteriorated.

In order to solve this problem, a technique has been proposed in which the electric power generated by the solar cell module is once stored in a storage battery, thereby mitigating the effects of sunshine fluctuations and maintaining a stable reverse osmosis pressure.
However, since this method requires a large-capacity storage battery, there is a problem that the practical use is hindered because the cost of the storage battery increases.

  The present invention has been made in order to solve the above-described problems, and in the produced water production apparatus that performs fresh water generation by the RO method, the capacity of the storage battery can be obtained even when the amount of power supplied varies. It aims at providing the produced water manufacturing apparatus which can suppress an increase.

In order to achieve the above object, the present invention provides the following means.
The apparatus for producing produced water of the present invention includes a first pressurizing unit that pressurizes the supplied raw water, a first reverse osmosis membrane unit that filters the pressurized raw water into intermediate water, and pressurizes the intermediate water A second pressurization unit, a second reverse osmosis membrane unit that filters the pressurized intermediate water to form product water, and is disposed between the first reverse osmosis membrane unit and the second pressurization unit, An intermediate water tank that temporarily stores the filtered intermediate water, a solar cell panel that generates electric power based on sunlight, a storage battery that temporarily stores the generated electric power, and an electric power generated from the solar cell panel When at least a part of the generated power is supplied to the storage battery and the amount of solar radiation decreases below a predetermined value, the amount of power supplied to either the first pressurizing unit or the second pressurizing unit is set. And a control unit that keeps the amount of power supplied to the other constant. It is characterized in.

  According to the present invention, raw water such as seawater or brine that has been pressurized by the first pressurizing unit is filtered in the first reverse osmosis membrane unit to become intermediate water. The intermediate water is pressurized by the second pressurizing unit and filtered in the second reverse osmosis membrane unit to produce product water such as fresh water.

When a predetermined amount of solar radiation is secured, the first pressurizing unit and the second pressurizing unit can be driven by at least the electric power generated by the solar cell panel.
On the other hand, when the amount of solar radiation decreases below a predetermined value, the power supplied to one of the first pressurizing unit and the second pressurizing unit is reduced and the power supplied to the other is predetermined. It is kept constant. Thereby, the filtration processing amount about raw | natural water or intermediate | middle water is kept constant.
When it is difficult to continue operation of one of the first pressurizing unit and the second pressurizing unit, the electric power stored in the storage battery is also supplied to one of the first pressurizing unit and the second pressurizing unit, and the operation is continued. Is planned.

  For example, when the raw water is continuously filtered, the intermediate water generated by the first reverse osmosis membrane unit is stored in the intermediate water tank unit. When the filtration of the intermediate water is continued, the intermediate water stored in the intermediate water tank part is pressurized by the second pressurizing part and filtered in the second reverse osmosis membrane part.

  In the above invention, the control unit controls the supply amount of electric power to the first pressurizing unit to be constant, and supplies the electric power to the second pressurizing unit based on increase / decrease in the amount of solar radiation, and It is desirable to control the amount of power supplied to the storage battery.

According to the present invention, since the first pressurizing unit requires a larger amount of power than the second pressurizing unit, the raw water is controlled by controlling the supply amount of power to the first pressurizing unit with priority. The first pressurizing unit supplies the first reverse osmosis membrane unit with a stable pressurizing force. Therefore, the raw water filtration process in the first reverse osmosis membrane part is stably performed, and the intermediate water is stably generated.
Moreover, since the amount of electric power supplied to the second pressurizing unit and the amount of electric power supplied to the storage battery are controlled based on the increase or decrease in the amount of solar radiation, an intermediate water tank unit that temporarily stores the filtered intermediate water Since it acts as a buffer that absorbs changes in solar radiation, the entire system can be simplified.

  In the said invention, it is desirable that the said solar cell panel is provided on the said intermediate water tank part.

  According to the present invention, since the solar cell panel is provided on the intermediate water tank portion, it is not necessary to provide a stand for supporting the solar cell panel, and the installation space can be made efficient.

  Furthermore, the heat of the solar cell panel heated by sunlight can be absorbed by the intermediate water stored in the intermediate water tank section. For example, when the solar cell panel includes a crystalline silicon solar cell module, it is possible to suppress a decrease in power generation performance by suppressing the temperature rise of the solar cell panel during sunshine.

  On the other hand, the temperature drop of the solar cell panel at night is suppressed by the amount of heat of the intermediate water stored in the intermediate water tank. For example, when the solar cell panel is provided with a thin film solar cell module made of amorphous silicon and crystalline silicon, the solar cell panel is heated by the heat stored in the intermediate water tank even at night. Temperature drop is suppressed. As a result, it is possible to suppress the facilitating effect of light deterioration that is likely to occur when the solar cell panel is cold, such as in the morning. Therefore, it is suitable for both crystalline silicon-based and thin-film silicon-based solar cell modules.

  In the above invention, a pressurized tank unit that is disposed between the second pressurized unit and the second reverse osmosis membrane unit and temporarily stores the pressurized intermediate water, and the pressurized tank unit It is desirable that a pressure adjusting unit that keeps the pressure of the intermediate water constant is provided.

  According to the present invention, even if the power supplied to the second pressurizing unit is reduced, the intermediate water that has been boosted to a predetermined pressure is stored inside the pressurizing tank unit, and this intermediate water is Supplied to the osmotic membrane part. Therefore, even if the amount of solar radiation decreases from a predetermined value, the intermediate water whose pressure has been increased to a predetermined pressure works as a buffer that absorbs the increase and decrease of the amount of solar radiation, and the intermediate water can be continuously filtered in the second reverse osmosis membrane portion.

In the said invention, it is desirable that the said solar cell panel is arrange | positioned on the said pressurized tank part.
According to the present invention, since the solar cell panel is provided on the pressurized tank portion, it is not necessary to provide a stand for supporting the solar cell panel, and the installation space can be made efficient.

  Furthermore, the heat of the solar cell panel heated by sunlight can be absorbed by the intermediate water stored in the pressurized tank unit. For example, when the solar cell panel includes a crystalline silicon solar cell module, it is possible to suppress a decrease in power generation performance by suppressing the temperature rise of the solar cell panel during sunshine.

  On the other hand, the temperature drop of the solar cell panel at night is suppressed by the amount of heat of the intermediate water stored in the pressurized tank unit. For example, when the solar cell panel is provided with a thin film solar cell module made of amorphous silicon and crystalline silicon, the solar cell panel is heated by the heat stored in the intermediate water tank even at night. Temperature drop is suppressed. As a result, it is possible to suppress the facilitating effect of light deterioration that is likely to occur when the solar cell panel is cold, such as in the morning. Therefore, it is suitable for both crystalline silicon-based and thin-film silicon-based solar cell modules.

  The apparatus for producing produced water of the present invention includes a first pressurizing unit that pressurizes the supplied raw water, a first reverse osmosis membrane unit that filters the pressurized raw water into intermediate water, and pressurizes the intermediate water A second pressurization unit, a second reverse osmosis membrane unit that filters the pressurized intermediate water to form product water, and is disposed between the first reverse osmosis membrane unit and the second pressurization unit, An intermediate water tank unit that temporarily stores the filtered intermediate water, a solar cell panel that generates electric power based on sunlight, a storage battery that temporarily stores generated electric power, and the solar cell panel during daytime Supplying the electric power generated by the first pressure unit and the storage battery and stopping the supply of the power to the second pressure unit, and supplying the power to the first pressure unit at night And a controller that supplies the power from the storage battery to the second pressurizing unit; And it is provided.

  According to the present invention, since the first pressurizing unit requires a larger amount of power than the second pressurizing unit, the first pressurizing unit uses the power generated by the solar cell panel in the time zone in which the amount of solar radiation is secured in the daytime. While the 1 pressurizing unit is operated, the storage battery is charged. In the first reverse osmosis membrane part, the pressured raw water is filtered, and the obtained intermediate water is stored in the intermediate water tank part. At this time, the second pressurizing unit is stopped in order to prioritize the amount of power supplied to the first pressurizing unit.

  In the time zone when night solar radiation is not obtained, electric power is supplied from the storage battery and the second pressurizing unit is operated. In the second reverse osmosis membrane part, the filtered intermediate water is filtered. At this time, the first pressurizing unit is stopped. Since the second pressurizing unit does not require larger electric power than the first pressurizing unit, the electric power can be efficiently used from the storage battery charged in the daytime.

Therefore, the first pressurization unit and the second pressurization unit are continuously operated for about 12 hours, and stable filtration can be performed in the first reverse osmosis membrane unit and the second reverse osmosis membrane unit.
Furthermore, the capacity | capacitance calculated | required by a storage battery can be suppressed, ensuring the quantity of the intermediate water filtered in a 2nd reverse osmosis membrane part.

  According to the produced water production apparatus of the present invention, when the amount of solar radiation that cannot be changed is reduced below a predetermined value, the power supplied to one of the first pressurizing unit and the second pressurizing unit is reduced. By keeping the power supplied to the other constant, there is an effect that it is possible to suppress an increase in the capacity of the storage battery while keeping the filtration process for the raw water or the intermediate water constant.

It is the schematic explaining the structure of the produced water manufacturing apparatus which concerns on the 1st Embodiment of this invention. It is a graph explaining allocation of the electric power generated with the solar cell panel in the generated water manufacturing apparatus of FIG. It is a graph explaining the change of the amount of solar radiation, and the change of the electrical storage capacity in the conventional storage battery. It is a graph explaining the change of the power consumption of the conventional high-pressure pump and an intermediate pressure pump, and the change of the amount of fresh water produced. It is a graph explaining the change of the amount of solar radiation, and the change of the electrical storage capacity in the storage battery of FIG. It is a graph explaining the change of the power consumption of the high pressure pump of FIG. 1, and a medium pressure pump, and the change of the amount of fresh water produced. It is the schematic explaining the structure of the produced water manufacturing apparatus which concerns on the 2nd Embodiment of this invention. It is a graph explaining the change of the amount of solar radiation, and the change of the electrical storage capacity in the storage battery of FIG. It is a graph explaining the change of the power consumption of the high pressure pump of FIG. It is the schematic explaining the structure of the produced water manufacturing apparatus which concerns on the 3rd Embodiment of this invention. It is a schematic diagram explaining the structure of the tank of FIG. It is the schematic explaining the structure of the produced water manufacturing apparatus which concerns on the 4th Embodiment of this invention. It is a schematic diagram explaining the structure of the tank of FIG. It is the schematic explaining the structure of the produced water manufacturing apparatus which concerns on the 5th Embodiment of this invention. It is a graph explaining the change of the amount of solar radiation, and the change of the electrical storage capacity in the storage battery of FIG. It is a graph explaining the change of the power consumption of the high pressure pump of FIG. 14, and a medium pressure pump, and the change of the amount of fresh water produced. It is the schematic explaining the structure of the produced water manufacturing apparatus which concerns on the 6th Embodiment of this invention. It is a graph explaining the change of the amount of solar radiation, and the change of the electrical storage capacity in the storage battery of FIG. It is a graph explaining the change of the power consumption of the high pressure pump of FIG.

[First Embodiment]
Hereinafter, the produced water production apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6.
FIG. 1 is a schematic diagram illustrating the configuration of the produced water production apparatus according to this embodiment.

The produced water production apparatus 1 of the present embodiment produces fresh produced water from seawater, which is raw water, using the RO method (reverse osmosis method), and drives electric power generated by a solar cell panel. It is used as power for operation.
As shown in FIG. 1, the produced water production apparatus 1 includes a high pressure pump (first pressurizing unit) 2A, a first RO module (first reverse osmosis membrane unit) 3A, and an intermediate pressure pump (second pressurizing unit). ) 2B, second RO module (second reverse osmosis membrane part) 3B, tank (intermediate water tank part) 4, solar panel 5, power controller 6, storage battery 7, power supply selector 8, and control Part 9 is provided.

The high-pressure pump 2A is a pump that raises the pressure of seawater to a high pressure (for example, about 5 MPa to 8 MPa), and supplies the pressurized seawater to the first RO module 3A.
Seawater is supplied to the high-pressure pump 2A, and concentrated intermediate water discharged from the second RO module 3B is also supplied. On the other hand, power is supplied from the power controller 6 to the high-pressure pump 2A.

The high-pressure pump 2A is configured to increase the pressure of seawater with a large flow rate to a high pressure as compared with the medium-pressure pump 2B. Therefore, the pump power in the high pressure pump 2A is larger than that in the intermediate pressure pump 2B. In this embodiment, the high pressure pump 2A has a pressure increase of about 5 MPa to 8 MPa, and the medium pressure pump 2B has a pressure increase of about 1 MPa to 3 MPa. Further, in consideration of the flow rate of seawater to be treated, the ratio of pump power between the high pressure pump 2A and the intermediate pressure pump 2B depends on the treatment capacity of the produced water production apparatus 1, the state of seawater that is raw water, and the performance of the osmotic membrane section Although it depends, the description will be made by applying to a case where the ratio is in the range of about 10: 1 to about 5: 1.
In addition, as a high pressure pump 2A, a well-known pump can be used and it does not specifically limit.

  The first RO module 3A generates seawater by filtering seawater. Here, the intermediate water is water whose amount of impurities contained in seawater including salinity is small compared to seawater which is low quality water, and is large compared to product water which is high quality generated water. . In other words, the intermediate water is medium quality product water from which much of the salinity has been removed but with a residual content.

  The first RO module 3A is supplied with seawater whose pressure has been increased from about 5 MPa to about 8 MPa by the high-pressure pump 2A. The pressurized seawater includes intermediate water that has been concentrated from the second RO module 3 </ b> B and has been enriched in salinity and impurity concentration. By recycling, the utilization rate of raw water (seawater) is improved.

  The intermediate water generated by the first RO module 3A is supplied to the tank 4. On the other hand, the concentrated seawater is discharged from the first RO module 3A. Concentrated seawater is seawater after intermediate water is generated by filtration, and is seawater in which the concentration of impurities such as salinity is increased compared to the original seawater. For example, concentrated seawater is returned to the sea again.

In the present embodiment, in the second RO module 3B, the intermediate water having about 10% salinity or impurity concentration concentrated by volume flow rate is used as the high-pressure pump 2A of the first RO module 3A based on the intermediate water supplied to the second RO module 3B. In the first RO module 3A, the seawater enriched with about 40% to about 60% of salinity and impurity concentration by volume flow rate is discharged from the first RO module 3A based on the seawater supplied to the first RO module 3A. The explanation is applied to an example.
Therefore, compared with the 2nd RO module 3B, the processing amount of the water in the 1st RO module 3A is very large.

  As the first RO module 3A, a module using a known RO method can be used and is not particularly limited.

The intermediate pressure pump 2B is a pump that increases the intermediate water to an intermediate pressure (for example, about 1 MPa to 3 MPa), and supplies the increased intermediate water to the second RO module 3B.
Intermediate water is supplied from the tank 4 to the intermediate pressure pump 2B, and the intermediate pressure pump 2B supplies intermediate water pressurized to about 1 MPa to 3 MPa to the second RO module 3B. On the other hand, power is supplied from the power supply selector 8 to the intermediate pressure pump 2B.

  Note that a known pump can be used as the intermediate pressure pump 2B, and is not particularly limited.

The 2nd RO module 3B produces | generates produced water by filtering the intermediate water.
Intermediate water whose pressure has been increased from about 1 MPa to about 3 MPa by the intermediate pressure pump 2B is supplied to the second RO module 3B, and the generated water generated by the second RO module 3B is supplied to the outside. On the other hand, the intermediate water whose salinity and impurity concentration are concentrated in the second RO module 3B is discharged to the upstream side of the high-pressure pump 2A.

  In addition, as the 2nd RO module 3B, what used the well-known RO method can be used, and it does not specifically limit.

The tank 4 temporarily stores the intermediate water generated by the first RO module 3A.
Intermediate water is supplied to the tank 4 from the first RO module 3A, and intermediate water is supplied from the tank 4 to the intermediate pressure pump 2B.

  In addition, as a tank 4, a well-known container can be used and it does not specifically limit.

The solar cell panel 5 converts sunlight into electric energy and generates power.
The solar cell panel 5 is electrically connected to the power controller 6.
As the solar cell panel 5, a single-layer amorphous silicon thin film solar cell, a crystalline silicon solar cell including microcrystalline silicon, a silicon germanium solar cell, an amorphous silicon solar cell and a crystalline silicon solar cell, silicon Various types such as multi-junction (tandem) solar cells, single-crystal silicon solar cells, polycrystalline-silicon solar cells, compound-based (CIGS, CdTe, etc.) solar cells in which germanium solar cells are stacked in layers from one to each. A known type can be used and is not particularly limited.

The power controller 6 performs power allocation based on a control signal from the control unit 9. Specific power allocation by the power controller 6 will be described later.
The power controller 6 is electrically connected to the solar cell panel 5, the storage battery 7, the power supply selector 8, and the high-pressure pump 2A. On the other hand, a control signal for controlling power allocation from the control unit 9 is input to the power controller 6.

The storage battery 7 temporarily stores the power generated by the solar cell panel 5 and supplies the stored power to the first RO module 3A and the like. The storage battery 7 is electrically connected to the power controller 6.
In addition, as the storage battery 7, well-known storage batteries, such as a lithium battery and a lead storage battery, can be used, and it does not specifically limit.

The power supply selector 8 supplies the power supplied from the power controller 6 to one of the high pressure pump 2A and the intermediate pressure pump 2B based on the control signal of the control device.
The power supply selector 8 is connected to be able to supply power from the power controller 6 and is connected to be able to supply power to the high pressure pump 2A and the intermediate pressure pump 2B.

On the other hand, a control signal for controlling the power allocation is connected to the control unit 9 so as to be inputable.
The power supply selector 8 may be a known one, and is not particularly limited.

The control unit 9 controls power allocation by controlling the power controller 6 and the power supply selector 8.
The control unit 9 is connected to the power controller 6 and the power supply selector 8 so that a control signal can be output.

Furthermore, at least one of the observation value of the sunshine fluctuation, in other words, the observation value of the solar radiation fluctuation, and the weather information is input to the control unit 9 and used for controlling the power controller 6 and the power supply selector 8.
Specific control by the control unit 9 will be described later.

Next, a method for producing the produced water in the produced water production apparatus 1 having the above configuration will be described.
In the produced water production apparatus 1 of the present embodiment, the high pressure pump 2A and the first RO module 3A are operated continuously for 24 hours, while the operations of the intermediate pressure pump 2B and the second RO module 3B are controlled.

Here, a series of flows when generated water is generated from seawater will be described.
First, power is supplied to the high-pressure pump 2A by the control unit 9, the power controller 6, and the power supply selector 8, and the high-pressure pump 2A is driven. Then, the seawater pressurized by the high-pressure pump 2A is supplied to the first RO module 3A, and subjected to a filtration process to generate intermediate water. The generated intermediate water is stored in the tank 4. On the other hand, the seawater in which the salinity and the impurity concentration are concentrated is discharged from the first RO module 3A.
The process so far is performed continuously for 24 hours.

  Thereafter, when the sunshine conditions are good (the amount of solar radiation is large) and the amount of power generated by the solar panel 5 is sufficient to drive the high-pressure pump 2A and the intermediate-pressure pump 2B, the next control is performed by the control unit 9. Is done by.

  That is, the control unit 9, the power controller 6, and the power supply selector 8 supply power to the intermediate pressure pump 2B from the solar battery panel 5, and drive of the intermediate pressure pump 2B is started. Then, after the intermediate water is temporarily stored in the tank 4, the pressure is increased from about 1 MPa to about 3 MPa by the intermediate pressure pump 2B and supplied to the second RO module 3B. In the second RO module 3 </ b> B, the intermediate water is subjected to a filtration process to become generated water. On the other hand, the intermediate water enriched in salinity, impurity concentration, etc. is discharged from the second RO module 3B, returned to the upstream side of the high-pressure pump 2A, and recycled to increase the overall recovery rate (utilization rate of raw water). Can be increased.

  When the sunshine conditions are even better, the amount of power generated by the solar cell panel 5 increases, so the following control is performed using the increased amount of power generated.

  That is, the power supplied from the solar cell panel 5 to the intermediate pressure pump 2B is further increased by the control unit 9, the power controller 6, and the power supply selector 8. Then, the intermediate pressure pump 2B boosts the intermediate water stored in the tank 4 in addition to the intermediate water generated by the first RO module 3A and supplies it to the second RO module 3B. Thereby, the amount of generated water generated by the second RO module 3B increases.

  Conversely, when the sunshine conditions deteriorate and the amount of solar radiation decreases, the amount of power generated by the solar cell panel 5 decreases, so the following control is performed.

  That is, the power supplied to the intermediate pressure pump 2B by the control unit 9 and the power supply selector 8 is preferentially supplied to the high pressure pump 2A, and the operating state of the high pressure pump 2A is maintained. When there is surplus power that can be supplied to the intermediate pressure pump 2B, the operation of the intermediate pressure pump 2B is continued according to the surplus power. On the other hand, when there is no surplus power, the operation of the intermediate pressure pump 2B is stopped.

  Alternatively, surplus power may be supplied to the storage battery 7 by the control unit 9 and the power controller 6.

When the sunshine conditions further deteriorate and the amount of solar radiation decreases, the amount of power generated by the solar cell panel 5 further decreases, so the following control is performed.
That is, the electric power supplied to the intermediate pressure pump 2 </ b> B by the control unit 9 and the power controller 6 is supplied to the storage battery 7. Furthermore, electric power is supplied from the storage battery 7 to the high-pressure pump 2A. Thereby, the operating state of the high-pressure pump 2A is maintained.

The following controls are performed at night.
That is, electric power is supplied from the storage battery 7 to the high-pressure pump 2 </ b> A by the control unit 9 and the power controller 6. Thereby, the operating state of the high-pressure pump 2A is maintained.

Here, power allocation in the produced water production apparatus 1 having the above-described configuration, in other words, power distribution will be described.
FIG. 2 is a graph for explaining allocation of electric power generated by the solar cell panel in the generated water production apparatus of FIG.
Here, it is the produced water manufacturing apparatus 1 provided with the solar cell panel 5 of 100 kW, Comprising: The ratio of the pump power of the high pressure pump 2A and the intermediate pressure pump 2B is 85:15. Further, a case where the high pressure pump is continuously driven for 24 hours and the intermediate pressure pump 2B is continuously driven for 12 hours will be described.

  As shown in FIG. 2, the amount of power generated by the solar panel 5 in fine weather starts to increase from sunrise (around 6 o'clock) and reaches its maximum at noon (around 12 o'clock). After that, the amount of power generation starts to decrease and becomes zero at sunset (around 18:00).

About 50% of the electric power generated by the solar cell panel 5 is charged in the storage battery 7 (A), about 7.5% is used for driving the intermediate pressure pump 2B (B), and about 42.5. % Is used to drive the high-pressure pump 2A (C).
The electric power charged in the storage battery 7 is used for driving the high-pressure pump 2A and the intermediate-pressure pump 2B when the amount of solar radiation fluctuates and at night.

Furthermore, the fluctuation | variation of the solar radiation amount in the produced water manufacturing apparatus 1, the power consumption of the high pressure pump 2A, the power consumption of the intermediate pressure pump 2B, and the fluctuation | variation of the electrical storage capacity in the storage battery 7 are demonstrated.
FIG. 3 is a graph for explaining changes in the amount of solar radiation and changes in the storage capacity of a conventional storage battery. FIG. 4 is a graph for explaining changes in the power consumption of the high-pressure pump and the intermediate-pressure pump and changes in the amount of water produced in the conventional system when control is performed based on the planned amount of solar radiation.

  L1 in FIG. 3 is a graph showing temporal fluctuations in the amount of solar radiation, and L2 is a graph showing temporal fluctuations in the storage capacity of the storage battery. L3 in FIG. 4 is a graph showing the time fluctuation of the power consumption of the high pressure pump, L4 is a graph showing the time fluctuation of the power consumption of the medium pressure pump, and L5 is a graph showing the time fluctuation of the fresh water production amount. is there.

  In the case of the produced water production apparatus that controls the conventional system, as shown in FIGS. 3 and 4, even if the amount of solar radiation fluctuates, the high-pressure pump and the intermediate-pressure pump are operated continuously and constantly. Control is performed (L3, L4). Therefore, the amount of produced water is also constant (L5).

On the other hand, the storage capacity (L2) of the storage battery shows a change that follows the fluctuation of the solar radiation (L1) with a delay. Furthermore, in contrast to the temporary decrease in the amount of solar radiation from 13:00 to 16:00, the storage capacity of the storage battery is reduced by about 13% compared to the case where there was no temporary decrease in the amount of solar radiation (dotted line). Fluctuations are appearing.
As in the conventional system of FIG. 4, even if the amount of solar radiation fluctuates based on the planned amount of solar radiation, in order to perform control to continuously operate the high-pressure pump and the intermediate pressure pump, the variation in solar radiation amount can be absorbed. In such a situation, a storage battery with sufficient capacity is required.

FIG. 5 is a graph for explaining the change in the amount of solar radiation and the change in the storage capacity of the storage battery of FIG. FIG. 6 is a graph for explaining changes in power consumption of the high-pressure pump and the intermediate-pressure pump in FIG. 1 and changes in the amount of fresh water produced.
In the case of the produced water production apparatus 1 of the present embodiment, as shown in FIGS. 5 and 6, the power consumption (L4) of the intermediate pressure pump 2B varies according to the variation in the amount of solar radiation (L1). Specifically, the power consumption (L4) of the intermediate pressure pump 2B decreases between 13:00 and 15:00. Therefore, the amount of water produced (L5) is also reduced.

  Furthermore, from 16:00 to 19:00, the amount of solar radiation (L1) has returned to the normal change, so that the power consumption of the intermediate pressure pump 2B ( L4) is increased to about 150% compared to the case of the conventional control (in the case of steady operation). Therefore, the amount of produced water per hour (L5) is also increased to about 150%.

After 19:00, which is the sunset, the power consumption (L4) of the intermediate pressure pump 2B is reduced again to the power consumption during steady operation, and the amount of fresh water generated per hour is reduced to the amount of fresh water produced during steady operation. Yes.
On the other hand, the power consumption (L3) in the high-pressure pump 2A is kept constant throughout the day.

  The storage capacity (L2) of the storage battery shows a change that follows the fluctuation of the solar radiation (L1) with a delay. Furthermore, in contrast to the temporary decrease in the amount of solar radiation from 13:00 to 16:00, the storage capacity of the storage battery is reduced by about 12% compared to the case where there was no temporary decrease in the amount of solar radiation (dotted line). Fluctuations are appearing.

According to the above configuration, the operating state of the high-pressure pump 2A that requires large pump power can be kept constant without fluctuation, so that the first RO module 3A remains in a high processing efficiency while maintaining high operating efficiency. Can be kept in. For this reason, the generated water production apparatus 1 of the present embodiment maintains the operation efficiency of the produced water production apparatus 1 by maintaining the operation of the high-pressure pump 2A occupying much of the necessary power in a stable state, Increase in cost can be suppressed.
Specifically, seawater is stably pressurized by the high-pressure pump 2A and supplied to the first RO module 3A. Therefore, the seawater filtration process in the first RO module 3A is stably performed, and the intermediate water is stably generated.

  Variations in the amount of power generated by the solar cell panel 5 due to variations in sunlight (variation in solar radiation) can be absorbed by controlling the operating state of the intermediate pressure pump 2B. That is, since the intermediate pressure pump 2B does not require larger electric power than the high pressure pump 2A, the operation state of the intermediate pressure pump 2B is frequently controlled, and the electric power can be efficiently used from the storage battery charged in the daytime. Therefore, the produced water production apparatus 1 of the present embodiment can be a system suitable for natural energy utilization.

  That is, an intermediate water tank that temporarily stores the filtered intermediate water while controlling the amount of electric power supplied to the intermediate pressure pump 2B and the amount of electric power supplied to the storage battery based on fluctuations in the amount of solar radiation. 4 functions as a buffer that absorbs the increase and decrease of the amount of solar radiation, so that the storage battery capacity can be suppressed and the entire system can be simplified.

  Use of the electric power stored in the storage battery 7 is controlled by the control unit 9 based on sunshine conditions. Specifically, the first RO module 3A is preferentially used to compensate for the insufficient power. Therefore, while maintaining the operating efficiency of the produced water production apparatus 1, an increase in the storage capacity of the storage battery 7 is suppressed, which can contribute to the cost reduction of the produced water production apparatus 1.

  Note that, as in the above-described embodiment, the generated water may be produced through two-stage filtration using the high pressure pump 2A and the first RO module 3A, and the intermediate pressure pump 2B and the second RO module 3B. The generated water may be formed through a three-stage filtration process in which the intermediate pressure pump 2B and the second RO module 3B are further subjected to a two-stage filtration process, and is not particularly limited.

  When three-stage filtration is performed, the low-pressure pump 2C and the third RO module 3C are provided after the filtration of the intermediate pressure pump 2B and the second RO module 3B (downstream side), so that three stages of filtration are performed as a whole. Perform processing. Here, with respect to the power and control of the intermediate pressure pump 2B used for the second stage filtration process and the low pressure pump 2C used for the third stage filtration process, and the RO module related thereto, the above-described intermediate pressure pump 2B and Control similar to that of the second RO module 3B can be performed.

  That is, the power and control of the low pressure pump 2C for the third stage filtration and the third RO module 3C are treated as a part of the configuration included in the intermediate pressure pump 2B and the second RO module 3B for the second stage filtration. The medium pressure pump 2B and the second RO module 3B described above can be handled as a representative.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the produced water production apparatus of this embodiment is the same as that of the first embodiment, but the control method of the intermediate pressure pump is different from that of the first embodiment. Therefore, in the present embodiment, only the configuration relating to the control of the intermediate pressure pump will be described using FIGS. 7 to 9, and description of other components and the like will be omitted.
FIG. 7 is a schematic diagram illustrating the configuration of the produced water production apparatus according to this embodiment.
In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 7, the generated water production apparatus 101 includes a high pressure pump 2A, a first RO module 3A, an intermediate pressure pump 2B, a second RO module 3B, a tank 4, a solar cell panel 5, and a power controller. 106, a storage battery 7, a power supply selector 8, and a control unit 109 are provided.

  The power controller 106 performs power allocation based on a control signal from the control unit 109. Specific power allocation by the power controller 106 will be described later. The power controller 106 is electrically connected to the solar cell panel 5, the storage battery 7, the power supply selector 8, and the high-pressure pump 2A. On the other hand, a control signal for controlling power allocation from the control unit 109 is input to the power controller 106.

  Here, the power controller 106 is different from the power controller 6 in the first embodiment in that power is supplied from the storage battery 7 to the intermediate pressure pump 2B.

The control unit 109 controls power allocation by controlling the power controller 106 and the power supply selector 8. The control unit 109 is connected to the power controller 106 and the power supply selector 8 so that a control signal can be output.
Furthermore, at least one of the observation value of the sunshine fluctuation, in other words, the observation value of the solar radiation fluctuation, and the weather information is input to the control unit 109 and used for controlling the power controller 106 and the power supply selector 8.

Here, the control unit 109 is different in that the control of the electric power supplied to the intermediate pressure pump 2B is gentle compared to the control in the first embodiment.
Specific control by the control unit 109 will be described later.

Next, power distribution in the produced water production apparatus 101 having the above-described configuration will be described.
In addition, about a series of flows when produced water is produced | generated from seawater, since it is the same as that of 1st Embodiment, the description is abbreviate | omitted.

  FIG. 8 is a graph for explaining changes in the amount of solar radiation and changes in the storage capacity of the storage battery of FIG. FIG. 9 is a graph for explaining changes in power consumption of the high-pressure pump and the intermediate-pressure pump in FIG. 7 and changes in the amount of fresh water produced.

In the case of the produced water production apparatus 101 of the present embodiment, as shown in FIGS. 8 and 9, the reference power consumption amount of the power consumption (L4) of the intermediate pressure pump 2B according to the fluctuation of the solar radiation amount (L1). The amount of decrease / increase is gradually changing.
Specifically, as shown at around 11:00 and around 14:00 and around 15:00, when the amount of solar radiation (L1) decreases, the control unit 109 outputs a control signal to the power controller 106 to generate a medium pressure pump. The power supplied to 2B is controlled to about 50%. Then, the power consumption (L4) of the intermediate pressure pump 2B is reduced to about 50% compared to the case of steady operation, and accordingly, the amount of fresh water generated per hour (L5) is also reduced to about 50%. To do.

  Thereafter, as shown at around 12:00 and around 16:00 to 17:00, when the amount of solar radiation (L1) recovers after being reduced, the control unit 109 ensures that the total amount of produced water per day is secured. As an object, the electric power supplied to the intermediate pressure pump 2B is controlled to about 150%. Then, the power consumption (L4) of the intermediate pressure pump 2B is increased to about 150% compared to the case of steady operation, and accordingly, the amount of fresh water generated per hour (L5) is also increased to about 150%. To do.

According to said structure, the control part 109 is fluctuate | varied within the range from about 50% to about 150%, when the electric power supplied to the intermediate pressure pump 2B is set to 100% of the power consumption at the time of steady operation. By controlling, the storage capacity of the storage battery 7 is leveled more than in the case of the first embodiment. For this reason, an increase in the storage capacity of the storage battery 7 is suppressed, which can contribute to the cost reduction of the produced water production apparatus 101.
Moreover, since the operation fluctuation amount of the intermediate pressure pump 2B is reduced, the operation efficiency of the intermediate pressure pump 2B is not greatly reduced, and the operation efficiency of the produced water production apparatus 1 can be maintained in a high state.

  On the other hand, when the same storage battery 7 is used, it is possible to improve the water production capacity of the produced water production apparatus 101.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the produced water production apparatus of this embodiment is the same as that of the first embodiment, but the configuration of the tank is different from that of the first embodiment. Therefore, in the present embodiment, only the configuration of the tank will be described with reference to FIGS. 10 and 11, and description of other components will be omitted.
FIG. 10 is a schematic diagram illustrating the configuration of the produced water production apparatus according to this embodiment. FIG. 11 is a schematic diagram illustrating the configuration of the tank of FIG.
In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 10 and 11, the generated water production apparatus 201 includes a high pressure pump 2A, a first RO module 3A, an intermediate pressure pump 2B, a second RO module 3B, a tank (intermediate water tank section) 204, A solar cell panel 5, a power controller 6, a storage battery 7, a power supply selector 8, and a control unit 9 are provided.

The tank 204 temporarily stores the intermediate water generated by the first RO module 3A. Intermediate water is supplied to the tank 204 from the first RO module 3A, and intermediate water is supplied from the tank 4 to the intermediate pressure pump 2B.
Furthermore, the tank 204 is disposed below the solar cell panel 5 and also serves as a stand for the solar cell panel 5.

  In addition, about a series of flows when generated water is produced | generated from the seawater in the produced water manufacturing apparatus 201 which consists of the above-mentioned structure, distribution of electric power, etc. are the same as that of 1st Embodiment, The description is abbreviate | omitted. To do.

According to said structure, in order to provide the solar cell panel 5 on the tank 204, it is not necessary to provide the mount which supports the solar cell panel 5. FIG. Furthermore, it becomes easy to give sufficient rigidity with respect to the front wind pressure and the back wind pressure acting on the solar cell panel 5 by the weight of the tank 204.
Therefore, the cost for installing the gantry and the site area for installing the generated water production apparatus 201 can be reduced.

  Furthermore, the heat of the solar cell panel 5 raised in temperature by sunlight during sunlight can be absorbed by the intermediate water stored in the tank 204. For example, when the solar cell panel 5 is provided with a crystalline silicon solar cell module, it is possible to suppress a decrease in power generation performance by suppressing the temperature rise of the solar cell panel 5 during sunshine.

On the other hand, the temperature drop of the solar cell panel 5 at night is suppressed by the amount of heat of the intermediate water stored in the tank 204. For example, in the case where the solar cell panel 5 is provided with a thin film solar cell module made of amorphous silicon and crystalline silicon, the solar cell panel is generated by heat stored in the intermediate water tank even at night. 5 is suppressed. As a result, it is possible to suppress the facilitating effect of light deterioration that is likely to occur when the solar cell panel is cold, such as in the morning.
Therefore, it is suitable for any solar cell module of crystalline silicon type or thin film silicon type to absorb the heat of the solar cell panel 5 heated by sunlight during sunshine to the intermediate water stored in the tank 204. .

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the produced water production apparatus of the present embodiment is the same as that of the third embodiment, but with the third embodiment, a pressurized tank is disposed between the intermediate pressure pump and the second RO module. Is different. Therefore, in the present embodiment, only the configuration around the pressure tank will be described with reference to FIGS. 12 and 13, and the description of other embodiments and the like will be omitted.
FIG. 12 is a schematic diagram illustrating the configuration of the produced water production apparatus according to this embodiment. FIG. 13 is a schematic diagram illustrating the configuration of the tank of FIG.
In addition, the same code | symbol is attached | subjected to the component same as 3rd Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 12 and 13, the generated water production apparatus 301 includes a high pressure pump 2A, a first RO module 3A, an intermediate pressure pump 2B, a second RO module 3B, a tank 204, and a pressurized tank (acceleration tank). (Pressure tank section) 304, solar cell panel 5, power controller 6, storage battery 7, power supply selector 8, and control section 9 are provided.

  The pressurization tank 304 temporarily stores the intermediate water boosted by the intermediate pressure pump 2B. The pressurized water is supplied to the pressurized tank 304 from the intermediate pressure pump 2B, and the intermediate water is supplied from the pressurized tank 304 to the second RO module 3B.

  The pressurized tank 304 is a container having a volume of about 10% to about 50% compared to the tank 204, and a pressure regulating valve (not shown) that regulates and maintains the pressure of intermediate water inside the pressurized tank 304. ) Is provided.

  Further, the pressurized tank 304 is disposed below the solar cell panel 5 together with the tank 204 and serves also as a mount for the solar cell panel 5. Specifically, the pressurized tank 304 is disposed below the tank 204 and at a position isolated from the solar cell panel 5.

  On the other hand, in the present embodiment, as shown in FIG. 13, the first RO module 3 </ b> A and the second RO module 3 </ b> B are arranged below the solar cell panel 5 that is not supported by the pressurized tank 304 and the tank 204.

  Note that a series of flows when generated water is generated from seawater in the generated water production apparatus 301 having the above-described configuration, power distribution, and the like are the same as those in the first embodiment, and thus description thereof is omitted. To do.

  According to said structure, even when there exists a fluctuation | variation in the operating state of the intermediate pressure pump 2B by the rapid fluctuation | variation of sunshine conditions, the pressure fluctuation of the intermediate water supplied to the 2nd RO module 3B is suppressed, and the 2nd RO module. This is preferable because the fluctuation of the filtration state of the intermediate water in 3B is reduced. That is, by accumulating the intermediate water boosted to a predetermined pressure in the pressurized tank 304, it can serve as a buffer that absorbs the increase and decrease of the amount of solar radiation, and the storage battery capacity can be suppressed.

  Specifically, even if the electric power supplied to the intermediate pressure pump 2B decreases, intermediate water that has been boosted to a predetermined pressure is stored inside the pressurized tank 304, and this intermediate water is stored in the second RO module 3B. Supplied. Therefore, even if the sunshine conditions fluctuate rapidly, the intermediate water filtration process in the second RO module 3B can be continued.

  The pressurized tank 304 disposed below the tank 204 stores intermediate water that has been heated by being pressurized. Therefore, while the tank 204 functions in the same manner as the third embodiment, the heat transfer from the tank 204 is suppressed by the pressurized tank 304, so that the heat storage effect by the tank 204 can be further enhanced. Similarly, the performance change of the solar cell panel 5 can be suppressed.

  Furthermore, since the tank 204, the pressurized tank 304, the first RO module 3A, and the second RO module 3B are arranged on the back surface of the solar cell panel 5, the solar cell panel 5 can be used as a roof. Furthermore, the site area where the generated water production apparatus 201 is installed can be reduced by effectively using the installation area of the solar cell panel 5.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the produced water production apparatus of this embodiment is the same as that of the first embodiment, but differs from the first embodiment in the method of distributing power to the high-pressure pump and the intermediate-pressure pump. Therefore, in the present embodiment, only the method for distributing power to the high-pressure pump and the intermediate-pressure pump will be described using FIGS. 14 to 16 and description of other components will be omitted.
FIG. 14 is a schematic diagram illustrating the configuration of the produced water production apparatus according to this embodiment.
In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 14, the generated water production apparatus 401 includes a high pressure pump 2A, a first RO module 3A, an intermediate pressure pump 2B, a second RO module 3B, a tank 4, a solar cell panel 5, and a power controller. 6, a storage battery 7, a power supply selector 8, and a control unit 409 are provided.

  The control unit 409 controls power allocation by controlling the power controller 6 and the power supply selector 8. The control unit 409 is connected to the power controller 6 and the power supply selector 8 so that a control signal can be output.

Furthermore, at least one of the observation value of the sunshine fluctuation, in other words, the observation value of the solar radiation fluctuation, and the weather information is input to the control unit 409 and used for controlling the power controller 6 and the power supply selector 8.
Specific control by the control unit 409 will be described later.

Next, power distribution in the produced water production apparatus 401 having the above-described configuration will be described.
In addition, about a series of flows when produced water is produced | generated from seawater, since it is the same as that of 1st Embodiment, the description is abbreviate | omitted.

  FIG. 15 is a graph for explaining changes in the amount of solar radiation and changes in the storage capacity of the storage battery of FIG. FIG. 16 is a graph illustrating a change in power consumption of the high-pressure pump and the intermediate-pressure pump in FIG. 14 and a change in the amount of generated water.

15 and 16, the ratio of the pump power of the high-pressure pump 2A and the medium-pressure pump 2B is 85:15, the high-pressure pump 2A is continuously operated for 12 hours in the daytime, and the medium-pressure pump 2B is operated at 12 hours at night. It shows the case of continuous operation.
Further, the distribution of solar solar radiation, that is, the distribution of electric power generated by the solar panel 5, is distributed from 80% to 85% for the operation of the high-pressure pump 2A in the daytime, and the operation of the intermediate-pressure pump 2B in the nighttime. It shows the case where 15% to 20% is allocated for use and change.

  In the case of the produced water production apparatus 401 of the present embodiment, as shown in FIGS. 15 and 16, the power consumption (L3) of the high pressure pump 2A and the consumption of the intermediate pressure pump 2B according to the fluctuation of the solar radiation amount (L1). The power (L4) is fluctuating.

  Specifically, during the daytime (from 7 o'clock to 19 o'clock) when the solar radiation amount (L1) is present, the control unit 409 outputs a control signal to the power controller 6 to change the power supplied to the high-pressure pump 2A to a steady state. The electric power supplied to the intermediate pressure pump 2B is controlled to about 0% while being controlled to about 200% as compared with the case of operation.

Then, the power consumption (L3) in the high-pressure pump 2A increases to about 200%, and accordingly, the amount of fresh water per hour in the first RO module 3A also increases to about 200%. On the other hand, the power consumption (L4) in the intermediate pressure pump 2B is about 0%, and the amount of generated water (L5) in the second RO module 3B is also about 0%.
Therefore, the generated intermediate water is stored in the large tank 4.

  At night when the amount of solar radiation (L1) disappears (from 19:00 to 7:00 on the next day), the control unit 409 outputs a control signal to the power controller 6 to supply the power supplied to the intermediate pressure pump 2B to steady operation. As compared with the case of the above, the power is controlled to about 200%, and the power supplied to the high pressure pump 2A is controlled to about 0%.

Then, the power consumption (L4) in the intermediate pressure pump 2B increases to about 200%, and accordingly, the amount of produced water per hour in the second RO module 3B also increases to about 200%. On the other hand, the power consumption (L3) in the high-pressure pump 2A is about 0%, and the amount of fresh water per hour in the first RO module 3A is also about 0%.
The intermediate water stored in the tank 4 is supplied to the second RO module 3B.

According to said structure, although produced water is obtained only at night, the storage battery capacity in the storage battery 7 can be reduced to about 35%, maintaining the amount of fresh water produced.
Furthermore, since both the high-pressure pump 2A and the medium-pressure pump 2B can be continuously operated stably for 12 hours, the generated water production apparatus 401 can be stably operated while maintaining high operation efficiency.

  Specifically, in the time zone in which the amount of solar radiation in the daytime is secured, the high-pressure pump 2A is operated using the power generated by the solar cell panel 5, and the storage battery 7 is charged. In the first RO module 3 </ b> A, the pressurized seawater is filtered, and the obtained intermediate water is stored in the large tank 4. At this time, the intermediate pressure pump 2B is stopped.

In the time zone when night solar radiation is not obtained, electric power is supplied from the storage battery 7 and the intermediate pressure pump 2B is operated. In the 2nd RO module 3B, the filtration process of the intermediate water pressurized by the intermediate pressure pump 2B is performed. At this time, the high-pressure pump 2A is stopped.
Since the amount of electric power of the intermediate pressure pump 2B is smaller than that of the high pressure pump 2A, the storage battery capacity for supplying to the intermediate pressure pump 2B operated at night may be small, and the cost of the storage battery is reduced.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the produced water production apparatus of this embodiment is the same as that of the first embodiment, but differs from the first embodiment in the method of distributing power to the high-pressure pump and the intermediate-pressure pump. Therefore, in the present embodiment, only the method of distributing power to the high-pressure pump and the intermediate-pressure pump will be described using FIGS. 17 to 19 and description of other components will be omitted.
FIG. 17 is a schematic diagram illustrating the configuration of the produced water production apparatus according to this embodiment.
In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 17, the generated water production apparatus 501 includes a high pressure pump 2A, a first RO module 3A, an intermediate pressure pump 2B, a second RO module 3B, a tank 4, a solar cell panel 5, and a power controller. 6, a storage battery 7, a power supply selector 8, and a control unit 509 are provided.

  The control unit 509 controls power allocation by controlling the power controller 6 and the power supply selector 8. The control unit 509 is connected to the power controller 6 and the power supply selector 8 so that a control signal can be output.

Furthermore, at least one of the observed value of the sunshine fluctuation, in other words, the observed value of the solar radiation fluctuation, and the weather information is input to the control unit 509 and used for controlling the power controller 6 and the power supply selector 8.
Specific control by the control unit 509 will be described later.

Next, power distribution in the produced water production apparatus 501 having the above-described configuration will be described.
In addition, about a series of flows when produced water is produced | generated from seawater, since it is the same as that of 1st Embodiment, the description is abbreviate | omitted.

  FIG. 18 is a graph for explaining changes in the amount of solar radiation and changes in the storage capacity of the storage battery of FIG. FIG. 19 is a graph for explaining changes in power consumption of the high-pressure pump and intermediate-pressure pump in FIG. 17 and changes in the amount of fresh water produced.

  In the case of the produced water production apparatus 501 of the present embodiment, as shown in FIGS. 18 and 19, the power consumption (L3) of the high-pressure pump 2A varies according to the variation in the amount of solar radiation (L1), and the intermediate pressure pump The power consumption (L4) of 2B is kept constant.

Specifically, as shown from around 14:00 to around 15:00, when the amount of solar radiation (L1) decreases, the control unit 509 outputs a control signal to the power controller 6 to supply the power supplied to the high-pressure pump 2A. It is controlled to about 50% compared with the case of steady operation. On the other hand, the electric power supplied to the intermediate pressure pump 2B is kept constant.
Then, the power consumption (L3) of the high-pressure pump 2A is reduced to about 50% as compared with the case of steady operation, and the amount of fresh water per hour of the intermediate water is also reduced to about 50% accordingly. On the other hand, the power consumption (L4) of the intermediate pressure pump 2B is kept constant, and according to this, the amount of fresh water generated per hour is also kept constant.
At this time, the intermediate water stored in the tank 4 is also supplied to the second RO module 3B by the intermediate pressure pump 2B.

  Thereafter, as shown from around 16:00 to around 18:00, when the amount of solar radiation (L1) recovers after decreasing, the control unit 509 aims to recover that the amount of intermediate water stored in the tank 4 has decreased. The electric power supplied to the high pressure pump 2A is controlled to about 150%. Then, the power consumption (L3) of the high-pressure pump 2A is increased to about 150% as compared to the case of steady operation, and accordingly, the amount of fresh water per hour of the intermediate water is also increased to about 200%.

  Further, when the change in the amount of solar radiation (L1) is rapid and the change in the amount of power generation in the solar panel 5 cannot be absorbed only by controlling the power supplied to the high-pressure pump 2A, the control unit 509 controls the medium-pressure pump 2B. The electric power supplied to is controlled in the range of about 50% to about 150% as compared with the case of steady operation.

According to the above configuration, the intermediate pressure pump 2B can be stably operated continuously for 24 hours by controlling the operation state of the high pressure pump 2A according to the magnitude of the sunlight fluctuation. The manufacturing apparatus 401 can be stably operated.
That is, since the electric power of the high-pressure pump 2A is large, the generated water production apparatus 401 can be stably operated based on large fluctuations in the amount of solar radiation.

  In addition, the intermediate water tank 4 that temporarily stores the filtered intermediate water by controlling the amount of power supplied to the high-pressure pump 2A serves as a buffer that absorbs the increase and decrease in the amount of solar radiation. Therefore, the entire system can be simplified.

1,101,201,301,401,501 Generated water production apparatus 2A High-pressure pump (first pressurizing unit)
2B Medium pressure pump (second pressurizing part)
3A 1st RO module (1st reverse osmosis membrane part)
3B 2nd RO module (2nd reverse osmosis membrane part)
4,204 tank (intermediate water tank)
5 Solar cell panel 7 Storage battery 9, 109, 409, 509 Control unit 304 Pressurized tank (pressurized tank unit)

Claims (6)

A first pressurizing unit that pressurizes the supplied raw water;
A first reverse osmosis membrane section that filters the pressurized raw water into intermediate water;
A second pressurizing unit that pressurizes the intermediate water;
A second reverse osmosis membrane portion that filters the intermediate water that has been pressurized into product water;
An intermediate water tank part that is disposed between the first reverse osmosis membrane part and the second pressurizing part and temporarily stores the filtered intermediate water;
A solar panel that generates power based on sunlight; and
A storage battery that temporarily stores the generated power;
Supplying at least a part of the electric power generated from the solar cell panel to the storage battery;
When the amount of solar radiation decreases below a predetermined value, the amount of power supplied to one of the first pressure unit and the second pressure unit is reduced and the amount of power supplied to the other is constant. A control unit to keep
A produced water production apparatus characterized by that. The control unit controls the supply amount of power to the first pressurizing unit to be constant,
The apparatus for producing produced water according to claim 1, wherein the supply amount of electric power to the second pressurizing unit and the supply amount of electric power to the storage battery are controlled based on an increase or decrease in the amount of solar radiation.   The produced water production apparatus according to claim 2, wherein the solar cell panel is provided on the intermediate water tank. A pressurized tank unit that is disposed between the second pressurized unit and the second reverse osmosis membrane unit and temporarily stores the pressurized intermediate water;
A pressure adjusting unit for keeping the pressure of the intermediate water in the pressurized tank unit constant;
The generated water production apparatus according to claim 2 or 3, wherein   The produced water production apparatus according to claim 4, wherein the solar cell panel is disposed on the pressurized tank section. A first pressurizing unit that pressurizes the supplied raw water;
A first reverse osmosis membrane section that filters the pressurized raw water into intermediate water;
A second pressurizing unit that pressurizes the intermediate water;
A second reverse osmosis membrane portion that filters the intermediate water that has been pressurized into product water;
An intermediate water tank part that is disposed between the first reverse osmosis membrane part and the second pressurizing part and temporarily stores the filtered intermediate water;
A solar panel that generates power based on sunlight; and
A storage battery that temporarily stores the generated power;
During the daytime, the power generated by the solar cell panel is supplied to the first pressurizing unit and the storage battery, and the supply of the power to the second pressurizing unit is stopped,
At night, while stopping the supply of power to the first pressurizing unit, a control unit for supplying the power from the storage battery to the second pressurizing unit,
A produced water production apparatus characterized by that.

Images