KR101111702B1 - Seawater desalination system control method according to reverse osmosis - Google Patents

Abstract

PURPOSE: A method for controlling a seawater desalinization system of a reverse osmosis technique is provided to secure the operational flexibility of a power generating source by being connected with the power generating source. CONSTITUTION: A method for controlling a seawater desalinization system of a reverse osmosis technique includes the following: information related to energy cost is received(S101); the rate of operation is determined based on the information(S103); one or more pumps are controlled based on the rate of the operation(S107); and one or more pressure adjusting units are controlled to adjust pressures applied to one or more reverse osmosis membranes(S113).

Description

Seawater desalination system control method using reverse osmosis method

The present invention relates to a seawater desalination system control method of the reverse osmosis method.

Seawater desalination technologies include evaporation and reverse osmosis (SWRO), and evaporation includes multi-stage flash (MSF) and multi-effect distillation (MED).

Multi-stage evaporation is a technique of producing fresh water by condensing seawater in multiple stages, and multi-utilization is the evaporation and latent heat exchange between the water vapor condensed in a tube and the concentrated brine flowing out of the tube. This technique uses the principle of lowering the Reverse osmosis is a technology that produces fresh water by filtering salts by allowing seawater to pass through the membrane at high pressure using a high pressure pump. Reverse osmosis is a technology that greatly reduces the energy cost compared to the conventional evaporation method, the application weight is increasing every year.

Seawater desalination requires enormous thermal and electrical energy. Therefore, most desalination facilities have power generation facilities that produce steam and power on their own. Furthermore, they are installed in power generating plants to operate together to reduce energy costs by efficiently utilizing the steam and power produced in-house. have. At present, around 15,000 of these desalination plants produce 40 million tons of drinking water per day. Thermal power has been mainly used for this purpose, but the use of nuclear power or renewable energy is being considered due to fuel costs and greenhouse gas emissions.

On the other hand, the intelligent power grid is a next-generation power grid technology that has been transformed from the centralized one-way closed technology base to the distributed grassroots two-way open technology base by combining information and communication technology with the existing power grid. As the problem of warming has emerged, its technical importance has been highlighted. When power generation and demand facilities are linked to the intelligent power grid, various new power services are possible based on real-time power-related information, and in the case of a reverse osmosis desalination plant, it becomes a major infrastructure to receive these new power services.

Intelligent power grid increases the efficiency and reliability of power grid by adding two-way open information and communication infrastructure to the power supply system that connects power generation, transmission, substation, distribution and consumer, and makes it easy to interlock with renewable power-based distributed power and electric vehicles. It will become an important national infrastructure to spread these dissemination. In addition, real-time demand trading and carbon credit trading markets will be activated.

Regardless of the method of evaporation or reverse osmosis, seawater desalination costs enormous energy costs. In the case of the evaporation method, thermal energy is mainly used for reverse osmosis. In the case of reverse osmosis, the energy consumption is lower than that of the evaporation method and electric energy is used, so it is easy to construct even if it is not near an energy source. In addition, the isobaric process through the energy recovery device (ERD) reduces the cost of high pressure pumps, thereby reducing the cost of energy. However, in the domestic and general regions, the cost of freshwater production is still higher than the market price of water, so it is not economical, and thus, commercial investment in a reverse osmosis desalination plant is delayed. Therefore, in order to go beyond the point of securing such economic feasibility, production cost must be reduced through breakthrough technology.

The present invention is to provide a reverse osmosis seawater desalination system and a reverse osmosis seawater desalination plant control method for reducing the cost of fresh water production.

Seawater desalination system according to an embodiment of the present invention comprises one or more pumps to provide pressurized seawater by applying pressure to the seawater; At least one reverse osmosis membrane for discharging fresh water and concentrated water from the pressurized seawater; At least one pressure regulating device respectively corresponding to the at least one reverse osmosis membrane and installed in a pipe through which concentrated water is discharged; And a control device for determining an operation rate based on the energy price related information, and controlling the one or more pumps according to the determined operation rate, wherein the control device controls the one or more pressure regulating devices to be applied to the one or more reverse osmosis membranes. Adjust the pressure

The seawater desalination system further includes two or more energy recovery devices, wherein the control device may operate some or all of the two or more energy recovery devices according to the determined operation rate.

The one or more reverse osmosis membranes correspond to two or more reverse osmosis membranes, and the seawater desalination system further includes two or more inflow valves corresponding to the two or more reverse osmosis membranes, and the control device controls the two or more inflow valves according to the determined operation rate. To operate some or all of the two or more reverse osmosis membranes.

The treatment volume of one of the at least two reverse osmosis membranes is different from the treatment volume of the other, and the control device may determine the combination of reverse osmosis membranes to be operated according to the determined operation rate.

The one or more pumps correspond to one pump, and the control device may adjust the output of the one pump according to the determined operation rate.

The one or more pumps correspond to two or more pumps, and the control device may run some or all of the two or more pumps according to the determined operation rate.

The maximum output of one of the two or more pumps is different from the maximum output of the other, and the control device may determine the combination of pumps to be operated according to the determined operation rate.

Seawater desalination system according to another embodiment of the present invention comprises two or more pumps for providing pressurized seawater by applying pressure to the seawater; At least one reverse osmosis membrane for discharging fresh water and concentrated water from the pressurized seawater; And a control device for determining an operation rate based on the energy price related information and for operating some or all of the two or more pumps according to the determined operation rate.

The one or more reverse osmosis membranes correspond to two or more reverse osmosis membranes, and the control device may operate some or all of the two or more reverse osmosis membranes according to the determined operation rate.

In connection with a method of controlling a seawater desalination system according to an embodiment of the present invention, the seawater desalination system is one or more pumps providing pressurized seawater by applying pressure to the seawater, draining freshwater and concentrated water from the pressurized seawater. At least one reverse osmosis membrane, and at least one pressure regulating device installed at the pipe from which the concentrated water is discharged, the method comprising: receiving energy price related information; Determining an operation rate based on the energy price related information; Controlling the one or more pumps according to the operation rate; And controlling the one or more pressure regulating devices to adjust the pressure applied to the one or more reverse osmosis membranes.

The seawater desalination system may further include two or more energy recovery devices, and the seawater desalination system control method may further include operating some or all of the two or more energy recovery devices according to the determined operation rate.

The one or more pumps correspond to one pump, and the controlling of the one or more pumps may include adjusting the output of the one pump according to the operation rate.

The one or more pumps correspond to two or more pumps, and controlling the one or more pumps may include starting some or all of the two or more pumps according to the operation rate.

The one or more reverse osmosis membranes correspond to two or more reverse osmosis membranes, and the controlling of the one or more pumps may include operating some or all of the two or more reverse osmosis membranes according to the operation rate.

According to one aspect of the present invention, by adjusting the operation rate of the seawater desalination plant in conjunction with the energy price-related information provided by the intelligent power grid, it is possible to increase the price competitiveness of desalination production, and to incentives such as the reduction in power demand, carbon credits, etc. Can earn additional revenue.

In addition, according to an aspect of the present invention, by operating a seawater desalination plant in conjunction with a power source that does not have operational flexibility, such as nuclear or renewable energy, the seawater desalination plant consumes excessively produced electricity to drive the power generation. It can provide flexibility, reduce greenhouse gas emissions by increasing power generation without carbon emissions, and solve the problem of water through the production of cheap fresh water.

1 is a diagram illustrating a seawater desalination network according to an embodiment of the present invention.
FIG. 2 is a view showing a seawater desalination plant of a reverse osmosis method of a single pump single train structure according to the first embodiment of the present invention.
3 is a view showing a seawater desalination plant of a reverse osmosis method of a single pump multi-train structure according to a second embodiment of the present invention.
4 is a view showing a seawater desalination plant of the reverse osmosis method of the multi-pump single train structure according to the third embodiment of the present invention.
5 is a view showing a seawater desalination plant of the reverse osmosis method of the multi-pump multi-train structure according to the fourth embodiment of the present invention.
6 is a flow chart showing a seawater desalination plant control method according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

The following describes a seawater desalination network according to an embodiment of the present invention.

1 is a diagram illustrating a seawater desalination network according to an embodiment of the present invention.

As shown in FIG. 1, the seawater desalination network 1 according to an embodiment of the present invention includes a seawater desalination system 10, an intelligent power grid 20, a demand management operating market server 30, and a carbon credit trading server ( 40, the seawater desalination system 10 includes a seawater desalination plant 100, a control system 200, and an energy management system 300.

The seawater desalination plant 100 performs seawater desalination using a reverse osmosis method.

The control system 200 controls the seawater desalination plant 100 to reduce the desalination cost by using the information obtained through the intelligent power grid 20.

The energy management system 300 trades the demand reduction amount and the carbon emission right obtained by the control system 200 by controlling the seawater desalination plant 100 through the demand management operation market server 30 and the carbon emission trading server 40. do.

The intelligent power grid 20 provides real-time power bill information, demand adjustment request information, carbon credit information, and the like.

The demand management operation market server 30 is a server for trading demand reduction amount.

The carbon credit trading server 40 is a server for trading carbon credits.

Next, a seawater desalination plant 100 according to various embodiments of the present disclosure will be described with reference to FIGS. 2 to 5.

FIG. 2 is a view showing a seawater desalination plant of a reverse osmosis method of a single pump single train structure according to the first embodiment of the present invention. In Fig. 2, the thick solid line represents the pipe. Components connected to the control system 200 in a broken line may be controlled by the control system 200.

As shown in FIG. 2, the seawater desalination plant 100 of the reverse osmosis method of the single pump single train structure according to the first embodiment of the present invention includes one high pressure pump 110a and one reverse osmosis membrane (Reverse Osmosis Membrane) ( 140a), one pressure regulating device 150a, one or more energy recovery device inlet valves 160a, one or more energy recovery devices 170a, and a booster pump 180a.

The high pressure pump 110a applies pressure to seawater provided from a seawater intake pump (not shown) to send pressurized seawater to the reverse osmosis membrane 140a. The output of the high pressure pump 110a is regulated by the control system 200. That is, the pressure exerted by the high pressure pump 110a to the seawater may be adjusted by the control system 200.

The high pressure pump 110a includes a multistage spiral winding pump and a flanger pump. The multi-stage winding pump has a structure in which a plurality of vanes are arranged side by side in series, and the efficiency is higher as it becomes larger. In addition, since the efficiency of the multi-stage winding pump is low as 40 ~ 75%, it can be installed together with the energy recovery device and can increase the overall efficiency. The plunger pump efficiency is very high as 70-95%, but it has been used a lot since the example, but has problems such as vibration.

By reverse osmosis, the reverse osmosis membrane 140a discharges low pressure fresh water and high pressure concentrated water from the pressurized seawater. Normally 48 to 63 bar of pressure is required for economic freshwater production.

The pressure regulating device 150a is installed in a pipe through which the high pressure concentrated water is discharged, and adjusts the pressure applied to the reverse osmosis membrane 140a by the seawater pressurized by the high pressure pump 110a. An example of a pressure regulating device is a pressure regulating valve. The control system 200 may control the pressure regulating device 150a to adjust the size of the discharge passage of the concentrated water. The larger the size of the discharge passage of the concentrated water, the smaller the pressure applied to the reverse osmosis membrane 140a, and the smaller the size of the discharge passage of the concentrated water, the larger the pressure applied to the reverse osmosis membrane 140a.

The pressure applied to the reverse osmosis membrane 140a may be controlled by the output of the high pressure pump 110a and the size of the discharge passage of the concentrated water by the operation of the pressure regulating device 150a.

When the output of the high pressure pump 110a is large, the amount of seawater introduced per hour is large, so even if the discharge passage of the concentrated water is relatively large, the pressure applied to the reverse osmosis membrane 140a is 48 to 63 bar, which is an economic freshwater production pressure. Can be reached. In this case, since the amount of seawater introduced per hour is large, the amount of fresh water discharged per hour and the amount of concentrated water discharged per hour also increase. Since the high pressure pump 110a accounts for a large portion of the power consumed by the reverse osmosis and seawater desalination plant, it is possible to increase freshwater production with a large power consumption.

When the output of the high pressure pump 110a is small, the amount of seawater introduced per hour is small, so that the size of the discharge passage of the concentrated water should be relatively small. The pressure applied to the reverse osmosis membrane 140a is 48 ~ 63 bar, which is an economic freshwater production pressure. Can be reached. In this case, since the amount of seawater introduced per hour is small, the amount of fresh water discharged per hour and the amount of concentrated water discharged per hour are also reduced. As such, freshwater production can be reduced with less power consumption.

As such, the control system 200 may control the high pressure pump 110a and the pressure regulating device 150a to adjust the operation rate and power consumption of the seawater desalination plant 100.

One or more energy recovery device inlet valves 160a under the control of the control system 200 in order to maintain the pressure of the concentrated water that has passed through the pressure regulating device 150a according to the operation rate of the seawater desalination plant 100 above a certain level. Some of them are open and others are closed. This is because the energy recovery efficiency of the energy recovery device 170a can be increased only when the pressure of the concentrated water passing through the pressure regulating device 150a is maintained at a predetermined level or more. That is, the greater the operating rate of the seawater desalination plant 100, the more energy recovery device inlet valve 160a is opened, and the smaller the utilization rate of seawater desalination plant 100, the more energy recovery device inlet valve 160a is closed.

The energy recovery device operating among the one or more energy recovery devices 170a is energy generated when the high pressure concentrated water flowing from the open energy recovery device inlet valve 160a is converted into the low pressure concentrated water. Convert seawater into high pressure seawater. The energy recovery device includes a turbine type and a cylinder type device, and a combination type device combining the two.

Since the pressure of the high pressure seawater output from the energy recovery device 170a is lower than the pressure of the high pressure seawater output from the high pressure pump 110a, the booster pump 180a has a high pressure output from the energy recovery device 170a. Apply additional pressure to the seawater. The high pressure seawater output from the booster pump 180a is combined with the high pressure seawater output from the high pressure pump 110a and provided to the reverse osmosis membrane 140a.

3 is a view showing a seawater desalination plant of a reverse osmosis method of a single pump multi-train structure according to a second embodiment of the present invention. In Fig. 3, the thick solid line represents the pipe. Components connected to the control system 200 in a broken line may be controlled by the control system 200.

As shown in FIG. 3, the seawater desalination plant 100 of the reverse osmosis method of the single pump multi-train structure according to the second embodiment of the present invention includes one high pressure pump 110b, a plurality of reverse osmosis membrane inflow valves 130b, And a plurality of reverse osmosis membranes 140b, a plurality of pressure regulating devices 150b, one or more energy recovery device inlet valves 160b, one or more energy recovery devices 170b, and a booster pump 180b.

The high pressure pump 110b applies pressure to the seawater provided from the seawater intake pump and sends the pressurized seawater to the plurality of reverse osmosis membranes 140b through open valves among the plurality of reverse osmosis membrane inflow valves 130b. The output of the high pressure pump 110b may be regulated by the control system 200. The control system 200 may control the high pressure pump 110b to adjust the operation rate and power consumption of the seawater desalination plant 100.

In order to increase the efficiency of fresh water production according to the output of the high pressure pump 110b, some of the plurality of reverse osmosis membrane inlet valves 130b are opened by the control of the control system 200, and the others are closed. Pressurized seawater is provided to the reverse osmosis membrane 140b only through the open reverse osmosis membrane inflow valve 130b.

The plurality of reverse osmosis membranes 140b are respectively connected to the plurality of reverse osmosis membrane inlet valves 130b by pipes. The reverse osmosis membrane 140b connected to the open reverse osmosis membrane inlet valve 130b discharges low pressure fresh water and high pressure concentrated water from the pressurized seawater.

The plurality of reverse osmosis membranes 140b may have different treatment capacities, respectively. For example, if the seawater desalination plant 100 has four reverse osmosis membranes 140b with treatment capacity of 10%, 20%, 30%, 40%, seawater desalination according to various combinations of the four reverse osmosis membranes 140b. The plant 100 may have a treatment capacity of 0% to 100% in units of 10%, thereby increasing the efficiency of freshwater production.

The plurality of pressure regulating devices 150b are respectively installed in the discharge pipes of the plurality of reverse osmosis membranes 140b through which the concentrated water of high pressure is discharged to adjust the pressure applied to the reverse osmosis membrane 140b by the seawater pressurized by the high pressure pump 110b.

One or more energy recovery device inlet valves 160b under the control of the control system 200 in order to maintain the pressure of the concentrated water that has passed through the pressure regulating device 150b according to the operation rate of the seawater desalination plant 100 above a certain level. Some of them are open and others are closed.

The energy recovery device operating among the one or more energy recovery devices 170b is an energy generated when the high pressure concentrated water flowing from the open energy recovery device inlet valve 160b is converted into the low pressure concentrated water and received from the seawater intake pump. Convert seawater into high pressure seawater.

The booster pump 180b applies additional pressure to the high pressure seawater output from the energy recovery device 170b. The high pressure seawater output from the booster pump 180b is combined with the high pressure seawater output from the high pressure pump 110b and provided to the reverse osmosis membrane 140b.

4 is a view showing a seawater desalination plant of the reverse osmosis method of the multi-pump single train structure according to the third embodiment of the present invention. In Fig. 4, the thick solid line represents the pipe. Components connected to the control system 200 in a broken line may be controlled by the control system 200.

As shown in FIG. 4, the seawater desalination plant 100 of the reverse osmosis method of the multi-pump single train structure according to the third embodiment of the present invention includes a plurality of high pressure pumps 110c and a plurality of high pressure pump discharge valves 120c. A reverse osmosis membrane 140c, a pressure regulating device 150c, at least one energy recovery device inlet valve 160c, at least one energy recovery device 170c, and a booster pump 180d.

The plurality of high pressure pumps 110c apply pressure to the seawater provided from the seawater intake pump to send the pressurized seawater to the reverse osmosis membrane 140c. The pump to operate among the plurality of high pressure pumps 110c may be determined by the control system 200. In addition, the output of the operating high pressure pump may be regulated by the control system 200. That is, the control system 200 may operate only a part of the plurality of high pressure pumps 110c and adjust the output of the operating high pressure pump to adjust the operation rate and power consumption of the seawater desalination plant 100.

The plurality of high pressure pumps 110c may have different maximum outputs, respectively. For example, if the seawater desalination plant 100 has four high pressure pumps 110c each having a maximum output of 10%, 20%, 30%, and 40% based on 100% utilization, four high pressure pumps ( According to various combinations of 110c), the seawater desalination plant 100 may have an operation rate of 0% to 100% in units of 10%. The seawater desalination plant 100 can use a simple high pressure pump that can only be turned on and off for various operating rates, thereby lowering the cost of the high pressure pump. If a high pressure pump with controlled output is used, the seawater desalination plant 100 may have more varied operation rates.

A plurality of high pressure pump discharge valves 120c are provided to prevent backflow of high pressure seawater to the inactive high pressure pump. That is, the plurality of high pressure pump discharge valves 120c are respectively connected to the output pipes of the plurality of high pressure pumps 110c, and when the operation of the high pressure pump 110c is stopped, the corresponding high pressure pump discharge valves 120c are controlled by the control system. It is locked by the control of 200.

The reverse osmosis membrane 140c discharges low pressure fresh water and high pressure concentrated water from the pressurized seawater.

The pressure regulating device 150c is installed in a pipe through which the high pressure concentrated water is discharged, and adjusts the pressure applied to the reverse osmosis membrane 140c by the seawater pressurized by the high pressure pump 110c.

One or more energy recovery device inlet valves 160c under the control of the control system 200 in order to maintain the pressure of the concentrated water passing through the pressure regulating device 150c above a certain level according to the operation rate of the seawater desalination plant 100. Some of them are open and others are closed.

The energy recovery device operating among the one or more energy recovery devices 170c is an energy generated when the high pressure concentrated water flowing from the open energy recovery device inlet valve 160c is converted into the low pressure concentrated water and received from the seawater intake pump. Convert seawater into high pressure seawater.

The booster pump 180c applies additional pressure to the high pressure seawater output from the energy recovery device 170c. The high pressure seawater output from the booster pump 180c is combined with the high pressure seawater output from the high pressure pump 110c and provided to the reverse osmosis membrane 140c.

5 is a view showing a seawater desalination plant of the reverse osmosis method of the multi-pump multi-train structure according to the fourth embodiment of the present invention. In Fig. 5, the thick solid line represents the pipe. Components connected to the control system 200 in a broken line may be controlled by the control system 200.

As shown in FIG. 5, the seawater desalination plant 100 having the reverse osmosis method of the multi-pump multi-train structure according to the fourth embodiment of the present invention includes a plurality of high pressure pumps 110d and a plurality of high pressure pump discharge valves 120d. , A plurality of reverse osmosis membrane inlet valves 130d, a plurality of reverse osmosis membranes 140d, a plurality of pressure regulating devices 150d, at least one energy recovery device inlet valve 160d, at least one energy recovery device 170d, and a booster pump ( 180d).

The plurality of high pressure pumps 110d pressurizes the seawater provided from the seawater intake pump to send the pressurized seawater to the plurality of reverse osmosis membranes 140d. The pump to operate among the plurality of high pressure pumps 110d may be determined by the control system 200. In addition, the output of the operating high pressure pump may be regulated by the control system 200. That is, the control system 200 may operate only a part of the plurality of high pressure pumps 110d and adjust the output of the operating high pressure pump to adjust the operation rate and power consumption of the seawater desalination plant 100.

A plurality of high pressure pump discharge valves 120d are provided to prevent backflow of high pressure seawater to the inactive high pressure pump. That is, the plurality of high pressure pump discharge valves 120d are respectively connected to the output pipes of the plurality of high pressure pumps 110d, and when the operation of the high pressure pump 110d is stopped, the corresponding high pressure pump discharge valve 120d is the control system. It is locked by the control of 200.

In order to increase the efficiency of fresh water production according to the output of the high pressure pump 110d, some of the plurality of reverse osmosis membrane inlet valves 130d are opened by the control of the control system 200, and the others are closed. The pressurized seawater is provided to the reverse osmosis membrane 140d only through the open reverse osmosis membrane inflow valve 130d.

The plurality of reverse osmosis membranes 140d are respectively connected to the plurality of reverse osmosis membrane inflow valves 130d by pipes. The reverse osmosis membrane 140d connected to the open reverse osmosis membrane inflow valve 130d discharges low pressure fresh water and high pressure concentrated water from the pressurized seawater. The plurality of reverse osmosis membranes 140d may have different treatment capacities, respectively.

The plurality of pressure regulating devices 150d are respectively installed in the discharge pipes of the plurality of reverse osmosis membranes 140d through which the high-pressure concentrated water is discharged, thereby adjusting the pressure applied to the reverse osmosis membrane 140d by the high pressure pump 110d.

One or more energy recovery device inlet valves 160d under the control of the control system 200 in order to maintain the pressure of the concentrated water passing through the pressure regulating device 150d above a certain level according to the operation rate of the seawater desalination plant 100. Some of them are open and others are closed.

The energy recovery device operating among the one or more energy recovery devices 170d is energy generated when the high pressure concentrated water flowing from the open energy recovery device inlet valve 160d is converted into the low pressure concentrated water. Convert seawater into high pressure seawater.

The booster pump 180d applies additional pressure to the high pressure seawater output from the energy recovery device 170d. The high pressure seawater output from the booster pump 180d is combined with the high pressure seawater output from the high pressure pump 110d and provided to the reverse osmosis membrane 140d.

Next, a control method for controlling the seawater desalination plant 100 by the control system 200 will be described with reference to FIG. 6.

6 is a flow chart showing a seawater desalination plant control method according to an embodiment of the present invention.

First, the control system 200 receives energy price related information, such as smart grid price information, carbon emission trading information, power use reduction request, etc. from the intelligent power grid 20 (S101).

Then, the control system 200 determines the power consumption (operation rate) for the seawater desalination plant 100 according to the energy price related information (S103). The control system 200 may determine the power consumption of the section having the highest ratio of freshwater production to total energy cost based on the energy price related information. In addition, incentives may be given when power consumption is high and power consumption is reduced. In this case, the control system 200 may reduce power consumption for the seawater desalination plant 100 based on the energy price related information.

Thereafter, the control system 200 determines the control content of the high pressure pump according to the determined power consumption (operation rate) (S105), and controls the high pressure pump according to the determined content (S107). If the seawater desalination plant 100 has a single high pressure pump, the control system 200 may determine the output of the high pressure pump corresponding to the determined power consumption (operation rate). If the seawater desalination plant 100 has a plurality of high pressure pumps with the same maximum output, the control system 200 may determine the number and output of the high pressure pump to operate for the determined power consumption (operation rate). If the seawater desalination plant 100 has a plurality of high pressure pumps with different maximum outputs, the control system 200 may determine the combination and output of the high pressure pump to operate for the determined power consumption (operation rate).

In addition, the control system 200 determines the control content of the reverse osmosis membrane inflow valve according to the determined power consumption (operation rate) (S109), and controls the reverse osmosis membrane inflow valve according to the determined contents (S111). If the seawater desalination plant 100 has a plurality of reverse osmosis membranes having the same processing capacity, the control system 200 may determine the number of reverse osmosis membranes to use for the determined power consumption (operation rate). If the seawater desalination plant 100 has a plurality of reverse osmosis membranes having different treatment capacities, the control system 200 may determine a combination of reverse osmosis membranes to be used for the determined power consumption (operation rate).

The control system 200 controls the pressure regulating device to adjust the pressure applied to the reverse osmosis membrane to a predetermined criterion (for example, 48 to 63 bar) (S113).

The control system 200 determines the number or combination of energy recovery devices to be operated for optimal energy recovery according to the determined power consumption (operation rate), and starts or stops the energy recovery device according to the determined content, and the energy to be operated. The energy recovery device inlet valve corresponding to the recovery device is opened and the energy recovery device inlet valve corresponding to the energy recovery device to be stopped is locked (S115).

The embodiments of the present invention described above are not only implemented by the apparatus and method but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (16)

delete delete delete delete delete delete delete delete delete delete delete In the method of controlling the seawater desalination system,
The seawater desalination system includes one or more pumps that pressurize the seawater to provide pressurized seawater, one or more reverse osmosis membranes for discharging freshwater and concentrated water from the pressurized seawater, and one or more pressure regulating devices installed in the pipes through which the concentrated water is discharged. Including,
The method
Receiving energy price related information;
Determining an operation rate based on the energy price related information;
Controlling the one or more pumps according to the operation rate; And
Controlling the at least one pressure regulating device to control the pressure applied to the at least one reverse osmosis membrane. The method of claim 12,
The seawater desalination system further includes two or more energy recovery devices,
The seawater desalination system control method
And operating some or all of said at least two energy recovery devices in accordance with said determined utilization rate. The method of claim 12,
The at least one pump corresponds to one pump,
The controlling of the one or more pumps includes controlling the output of the one pump according to the operation rate. The method of claim 12,
The at least one pump corresponds to at least two pumps,
Controlling the one or more pumps comprises operating some or all of the two or more pumps in accordance with the utilization rate. The method of claim 12,
The at least one reverse osmosis membrane corresponds to at least two reverse osmosis membranes,
Controlling the at least one pump comprises operating some or all of the at least two reverse osmosis membranes in accordance with the operation rate.

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