Control system, method and apparatus for seawater desalination

Abstract

The present disclosure relates to a control system, method and device for seawater desalination, belonging to the technical field of seawater desalination, which comprises a filtering device, a first end of the filtering device being connected with a seawater input port of the system, a second end of the filtering device being connected with a concentrated water output port of the system; a first reverse osmosis device, a first end of the first reverse osmosis device being connected with a third end of the filtering device, a second end of the first reverse osmosis device being connected with the concentrated water output port of the system; a second reverse osmosis device, a first end of the second reverse osmosis device being connected with a third end of the first reverse osmosis device, the second reverse osmosis device being connected with the concentrated water output port of the system, a third end of the second reverse osmosis device being connected with a fresh water output port of the system, a fourth end of the second reverse osmosis device being connected with a fresh water interface of the system; a controller, the controller being electrically connected with the filtering device, the first reverse osmosis device and the second reverse osmosis device respectively.

Description

Control systems, methods and apparatus for seawater desalination Technical Field

[0001] This disclosure relates to the technical field of seawater desalination, and more specifically, to a control system, method, and apparatus for seawater desalination. Background Technology

[0002] With the rapid development of seawater desalination technology, desalinated water can provide drinking water for areas lacking fresh water. Currently, existing seawater desalination equipment can desalinate seawater using filtration and reverse osmosis devices. To improve the efficiency of freshwater utilization, seawater desalination equipment can filter and permeate seawater while simultaneously mixing it with fresh water. However, the efficiency of producing drinking water with a certain salinity through this type of equipment is relatively low. Summary of the Invention

[0003] One objective of this disclosure is to provide a new technical solution for controlling seawater desalination.

[0004] According to a first aspect of this disclosure, a control system for seawater desalination is provided, the system comprising:

[0005] A filtration device, wherein the first end of the filtration device is connected to the seawater inlet of the system, and the second end of the filtration device is connected to the concentrate outlet of the system;

[0006] A first reverse osmosis device, wherein a first end of the first reverse osmosis device is connected to a third end of the filter device, and a second end of the first reverse osmosis device is connected to the concentrated water output port of the system.

[0007] The second reverse osmosis device has a first end connected to the third end of the first reverse osmosis device, a second reverse osmosis device connected to the concentrated water outlet of the system, a third end of the second reverse osmosis device connected to the fresh water outlet of the system, and a fourth end of the second reverse osmosis device connected to the fresh water interface of the system.

[0008] A controller, electrically connected to the filtration device, the first reverse osmosis device, and the second reverse osmosis device, is configured to: in response to a water supply request for a first salinity, determine the freshwater demand for the first salinity and the available freshwater supply of the system; when the available freshwater supply is greater than or equal to a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet and determine the first flow rate of the treated seawater; the controller is also configured to: based on the first flow rate and the first salinity, set a second flow rate of the freshwater at the freshwater inlet, and then control the second reverse osmosis device to treat the freshwater at the freshwater inlet and the treated seawater, and output it from the freshwater outlet of the system.

[0009] Optionally, the controller is further configured to: when the available freshwater quantity is less than a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet; detect the second salinity of the seawater treated by the first reverse osmosis device; when the second salinity does not exceed the first set salinity, control the first reverse osmosis device to output the treated seawater to the second reverse osmosis device, and determine the third flow rate of the treated seawater; the controller is further configured to: set the fourth flow rate of the freshwater at the freshwater interface according to the second flow rate and the second salinity, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0010] Optionally, the controller is further configured to: when the second salinity exceeds the first set salinity, control the first reverse osmosis device to output the treated seawater to the concentrated water outlet of the system.

[0011] Optionally, the controller is further configured to: detect the third salinity of the seawater treated by the filtration device; when the third salinity exceeds the second set salinity, control the filtration device to output the treated seawater to the concentrated water outlet of the system; and when the third salinity does not exceed the second set salinity, control the filtration device to output the treated seawater to the first reverse osmosis device.

[0012] According to a second aspect of this disclosure, a control method for seawater desalination is also provided. This control method is based on a control system for seawater desalination as described in the first aspect. The controller is the executing entity of the control method, and the method includes:

[0013] In response to a water supply request at a first salinity, the freshwater demand at the first salinity and the freshwater availability of the system are determined.

[0014] When the available freshwater quantity is greater than or equal to a set threshold, the filtration device and the first reverse osmosis device are first controlled to treat the seawater at the seawater inlet, and the first flow rate of the treated seawater is determined.

[0015] Based on the first flow rate and the first salinity, a second flow rate of freshwater from the freshwater interface is set, and then the second reverse osmosis device is controlled to treat the freshwater from the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0016] Optionally, after determining the freshwater demand at the first salinity and the available freshwater supply of the system in response to a water supply request at the first salinity, the method further includes:

[0017] When the available freshwater quantity is less than a set threshold, the filtration device and the first reverse osmosis device are first controlled to treat the seawater at the seawater inlet;

[0018] Detect the second salinity of the seawater after it has been treated by the first reverse osmosis unit;

[0019] When the second salinity does not exceed the first set salinity, the first reverse osmosis device is controlled to output the treated seawater to the second reverse osmosis device, and the third flow rate of the treated seawater is determined;

[0020] Based on the second flow rate and the second salinity, a fourth flow rate of freshwater from the freshwater interface is set, and then the second reverse osmosis device is controlled to treat the freshwater from the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0021] Optionally, after detecting the second salinity of the seawater treated by the first reverse osmosis device, the method further includes:

[0022] When the second salinity exceeds the first set salinity, the first reverse osmosis device is controlled to output the treated seawater to the concentrated water outlet of the system.

[0023] Optionally, before detecting the second salinity of the seawater treated by the first reverse osmosis unit, the method further includes:

[0024] The third salinity of the seawater after treatment by the filtration device is detected;

[0025] When the third salinity exceeds the second set salinity, the filtration device is controlled to output the treated seawater to the concentrated water outlet of the system.

[0026] When the third salinity does not exceed the second set salinity, the filtration device is controlled to output the treated seawater to the first reverse osmosis device.

[0027] According to a third aspect of this disclosure, a control device for seawater desalination is also provided, the device comprising:

[0028] A response module is used to respond to a water supply request for a first salinity, and to determine the freshwater demand for the first salinity and the available freshwater quantity of the system.

[0029] The determination module is used to control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet when the available freshwater is greater than or equal to a set threshold, and to determine the first flow rate of the treated seawater.

[0030] The control module is used to set a second flow rate of freshwater from the freshwater interface based on the first flow rate and the first salinity, and then control the second reverse osmosis device to treat the freshwater from the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0031] According to a third aspect of this disclosure, a control device for seawater desalination is also provided, comprising a memory and a processor, the memory being used to store a computer program; the processor being used to execute the computer program to implement the method according to a second aspect of this disclosure.

[0032] According to a fourth aspect of this disclosure, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the method according to a second aspect of this disclosure.

[0033] One beneficial effect of this embodiment is that when a user's terminal issues a water supply request, the controller responds to the request, determines the freshwater demand at a first salinity and the available freshwater supply of the system. When the available freshwater supply is greater than or equal to a set threshold, the controller first controls the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet and determines the first flow rate of the treated seawater. Then, based on the first flow rate and the first salinity, the controller sets the second flow rate of the freshwater at the freshwater outlet. Finally, the controller controls the second reverse osmosis device to treat the freshwater at the freshwater outlet and the treated seawater, and outputs the freshwater from the system's freshwater outlet, thereby achieving a high-efficiency acquisition of domestic water at the first salinity to meet different user needs.

[0034] Other features and advantages of the embodiments of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the embodiments of the present disclosure.

[0036] Figure 1 is a schematic diagram of the composition of a control system applicable to seawater desalination according to one embodiment;

[0037] Figure 2 is a schematic flowchart of a seawater desalination control method according to one embodiment;

[0038] Figure 3 is a block diagram of a control device for seawater desalination according to one embodiment;

[0039] Figure 4 is a schematic diagram of the hardware structure of a control device for seawater desalination according to one embodiment. Detailed Implementation

[0040] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0041] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0042] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0043] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0045] <System Implementation Example>

[0046] Figure 1 is a schematic diagram of the composition of a control system applicable to seawater desalination according to one embodiment. As shown in Figure 1, the system includes a filtration device, a first reverse osmosis device, a second reverse osmosis device, and a controller.

[0047] A filtration device, wherein the first end of the filtration device is connected to the seawater inlet of the system, and the second end of the filtration device is connected to the concentrate outlet of the system;

[0048] In this application, the filtration device can pre-treat and remove impurities, and physically intercept some large particles of impurities to provide relatively clean seawater.

[0049] A first reverse osmosis device, wherein a first end of the first reverse osmosis device is connected to a third end of the filter device, and a second end of the first reverse osmosis device is connected to the concentrated water output port of the system.

[0050] In this application, the first reverse osmosis device can remove salt and impurities from seawater treated by the filtration device. The first reverse osmosis device can be a reverse osmosis membrane or a reverse osmosis membrane group composed of multiple reverse osmosis membranes, and there is no limitation on this.

[0051] The second reverse osmosis device has a first end connected to the third end of the first reverse osmosis device, a second reverse osmosis device connected to the concentrated water outlet of the system, a third end of the second reverse osmosis device connected to the fresh water outlet of the system, and a fourth end of the second reverse osmosis device connected to the fresh water interface of the system.

[0052] In this application, the second reverse osmosis device can further remove the salt and impurities from the seawater treated by the first reverse osmosis device. The second reverse osmosis device can be a reverse osmosis membrane or a reverse osmosis membrane group composed of multiple reverse osmosis membranes, and there is no limitation on this.

[0053] A controller, electrically connected to the filtration device, the first reverse osmosis device, and the second reverse osmosis device, is configured to: in response to a water supply request for a first salinity, determine the freshwater demand for the first salinity and the available freshwater supply of the system; when the available freshwater supply is greater than or equal to a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet and determine the first flow rate of the treated seawater; the controller is also configured to: based on the first flow rate and the first salinity, set a second flow rate of the freshwater at the freshwater inlet, and then control the second reverse osmosis device to treat the freshwater at the freshwater inlet and the treated seawater, and output it from the freshwater outlet of the system.

[0054] In this application, the controller may be a PLC control cabinet to control the opening and closing of the first, second and third ends of the filter device, as well as the opening and closing of the first, second and third ends of the first reverse osmosis device, and the opening and closing of the first, second and third ends of the second reverse osmosis device.

[0055] In this application, the water supply request can be sent from the user's terminal to the controller, and the user can edit the domestic water supply required within a certain salinity range and send it to the controller, which is the first salinity range.

[0056] In this application, the controller is also electrically connected to a water level sensor of a freshwater storage container to determine the amount of freshwater available.

[0057] In this application, the threshold can be set to 10%, 20%, or 30%, etc. For example, the fresh water in the fresh water storage container can be replenished in a time cycle, and the time cycle is 5 days with a threshold of 10%. The daily fresh water consumption is 20%, and when the total storage volume on the second day is 95%, then the available fresh water volume on the second day is 15%.

[0058] In this application, the seawater desalination control system is equipped with a first flow meter, which can detect the first flow at the third end of the first reverse osmosis unit.

[0059] In this application, for the same salinity, when the first flow rate is large, the second flow rate can be increased simultaneously; when the first flow rate is small, the second flow rate can be decreased simultaneously. The specific ratio of treated seawater and freshwater mixed to achieve the first salinity for domestic use can be set manually and is not limited here.

[0060] In other words, when a user's terminal issues a water supply request, the controller responds to the request, determines the freshwater demand at the first salinity and the available freshwater supply of the system. When the available freshwater supply is greater than or equal to a set threshold, it first controls the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet and determines the first flow rate of the treated seawater. Then, based on the first flow rate and the first salinity, it sets the second flow rate of the freshwater at the freshwater outlet. Finally, it controls the second reverse osmosis device to treat the freshwater at the freshwater outlet and the treated seawater, and outputs it from the freshwater outlet of the system to achieve a high-efficiency supply of domestic water at the first salinity to meet the different needs of users.

[0061] In some embodiments, the controller is further configured to: when the available freshwater is less than a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet; detect the second salinity of the seawater treated by the first reverse osmosis device; when the second salinity does not exceed the first set salinity, control the first reverse osmosis device to output the treated seawater to the second reverse osmosis device, and determine the third flow rate of the treated seawater; the controller is further configured to: set the fourth flow rate of the freshwater at the freshwater interface according to the second flow rate and the second salinity, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0062] In this application, the seawater desalination control system is equipped with a first salinity meter, which can detect the second salinity at the third end of the first reverse osmosis unit.

[0063] In this application, the first set salinity can be set manually, and no limitation is made here.

[0064] In other words, when the amount of freshwater available is less than a set threshold, it is necessary to control the second salinity of the treated seawater detected by the first salinity meter in order to obtain domestic water with the first salinity using less freshwater.

[0065] In some embodiments, the controller is further configured to: when the second salinity exceeds the first set salinity, control the first reverse osmosis device to output the treated seawater to the concentrated water outlet of the system.

[0066] In other words, by sending seawater with a second salinity exceeding the first set salinity to the concentrate outlet, seawater with a salinity exceeding the first set salinity can be discharged, thereby further realizing the use of less freshwater to obtain domestic water with the first salinity.

[0067] In some embodiments, the controller is further configured to: detect a third salinity of the seawater treated by the filtration device; when the third salinity exceeds a second set salinity, control the filtration device to output the treated seawater to the concentrate outlet of the system; and when the third salinity does not exceed the second set salinity, control the filtration device to output the treated seawater to the first reverse osmosis device.

[0068] In this application, the second set salinity can be set manually, and no limitation is made here.

[0069] In other words, by sending seawater with a third salinity exceeding the second set salinity to the concentrate outlet, seawater with a salinity exceeding the second set salinity can be discharged, thereby further realizing the use of less freshwater to obtain domestic water with the first salinity.

[0070] In the embodiments of this disclosure, the memory of the controller 400 is used to store a computer program that controls the processor of the controller 400 to operate in order to implement a seawater desalination control method according to any embodiment. Those skilled in the art can design the computer program based on the scheme of the embodiments of this disclosure. How the computer program controls the processor to operate is well known in the art and will not be described in detail here.

[0071] <Method Implementation>

[0072] Figure 2 is a schematic flowchart of a control method for seawater desalination according to one embodiment. The implementing entity is, for example, the controller in Figure 1.

[0073] As shown in Figure 2, the seawater desalination control method of this embodiment may include the following steps S210 to S230:

[0074] Step S210: In response to the water supply request for the first salinity, determine the freshwater demand for the first salinity and the freshwater availability of the system.

[0075] Step S220: When the amount of fresh water available is greater than or equal to a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet, and determine the first flow rate of the treated seawater.

[0076] In some embodiments, after step S210, the method further includes the following steps S310 to S340:

[0077] Step S310: When the amount of fresh water available is less than a set threshold, the filtration device and the first reverse osmosis device are first controlled to treat the seawater at the seawater inlet.

[0078] Step S320: Detect the second salinity of the seawater after treatment by the first reverse osmosis device.

[0079] Step S330: When the second salinity does not exceed the first set salinity, control the first reverse osmosis device to output the treated seawater to the second reverse osmosis device, and determine the third flow rate of the treated seawater.

[0080] In some embodiments, after step S320, the method further includes the following step S410:

[0081] Step S410: When the second salinity exceeds the first set salinity, control the first reverse osmosis device to output the treated seawater to the concentrated water output port of the system.

[0082] In some embodiments, after step S320, the method further includes the following steps S510 to S530:

[0083] Step S510: Detect the third salinity of the seawater after it has been treated by the filtration device.

[0084] Step S520: When the third salinity exceeds the second set salinity, control the filtration device to output the treated seawater to the concentrated water output port of the system.

[0085] Step S530: When the third salinity does not exceed the second set salinity, control the filtration device to output the treated seawater to the first reverse osmosis device.

[0086] Step S340: Based on the second flow rate and the second salinity, set the fourth flow rate of the freshwater at the freshwater interface, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0087] Step S230: Based on the first flow rate and the first salinity, set the second flow rate of the freshwater at the freshwater interface, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0088] <Equipment Example 1>

[0089] Figure 3 is a schematic block diagram of a seawater desalination control device according to one embodiment. As shown in Figure 3, the seawater desalination control device 30 includes:

[0090] The response module 31 is used to respond to the water supply request of the first salinity and determine the freshwater demand of the first salinity and the freshwater availability of the system.

[0091] The determining module 32 is used to control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet when the available freshwater is greater than or equal to a set threshold, and to determine the first flow rate of the treated seawater.

[0092] The control module 33 is used to set the second flow rate of the freshwater at the freshwater interface according to the first flow rate and the first salinity, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0093] Optionally, the seawater desalination control device 30 further includes an output module, configured to, when the available freshwater quantity is less than a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet; detect the second salinity of the seawater treated by the first reverse osmosis device; when the second salinity does not exceed the first set salinity, control the first reverse osmosis device to output the treated seawater to the second reverse osmosis device, and determine the third flow rate of the treated seawater; the controller is further configured to: set a fourth flow rate of the freshwater at the freshwater interface based on the second flow rate and the second salinity, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

[0094] Optionally, the seawater desalination control device 30 further includes a concentrate output module, used to control the first reverse osmosis device to output the treated seawater to the concentrate output port of the system when the second salinity exceeds the first set salinity.

[0095] Optionally, the seawater desalination control device 30 further includes a detection module for detecting the third salinity of the seawater treated by the filtration device. When the third salinity exceeds the second set salinity, the module controls the filtration device to output the treated seawater to the concentrated water outlet of the system. When the third salinity does not exceed the second set salinity, the module controls the filtration device to output the treated seawater to the first reverse osmosis device.

[0096] The control device 30 for seawater desalination can be a controller 400.

[0097] <Equipment Example 2>

[0098] Figure 4 is a schematic diagram of the hardware structure of a control device for seawater desalination according to another embodiment.

[0099] As shown in Figure 4, the seawater desalination control device 40 includes a processor 41 and a memory 42. The memory 42 is used to store an executable computer program, and the processor 41 is used to execute the method as described in any of the above method embodiments according to the control of the computer program.

[0100] Each module of the seawater desalination control device 30 can be implemented by the processor 41 executing the computer program stored in the memory 42 in this embodiment, or it can be implemented by other structures, which are not limited here.

[0101] This invention can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of the invention.

[0102] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0103] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0104] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0105] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0106] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0107] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0108] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. It will be known to those skilled in the art that implementation in hardware, implementation in software, and implementation using a combination of software and hardware are equivalent.

[0109] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A control system for seawater desalination, characterized in that, The system includes: a filtration device, the first end of which is connected to the seawater inlet of the system, and the second end of which is connected to the concentrate outlet of the system; a first reverse osmosis device, the first end of which is connected to the third end of the filtration device, and the second end of which is connected to the concentrate outlet of the system; a second reverse osmosis device, the first end of which is connected to the third end of the first reverse osmosis device, the second reverse osmosis device is connected to the concentrate outlet of the system, the third end of which is connected to the freshwater outlet of the system, and the fourth end of which is connected to the freshwater interface of the system; and a controller. The controller is electrically connected to the filtration device, the first reverse osmosis device, and the second reverse osmosis device, respectively. The controller is configured to: in response to a water supply request for a first salinity, determine the freshwater demand for the first salinity and the available freshwater volume of the system; when the available freshwater volume is greater than or equal to a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet and determine the first flow rate of the treated seawater; the controller is also configured to: set a second flow rate of the freshwater at the freshwater interface based on the first flow rate and the first salinity, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

2. The system according to claim 1, characterized in that, The controller is further configured to: when the available freshwater quantity is less than a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet; detect the second salinity of the seawater treated by the first reverse osmosis device; when the second salinity does not exceed the first set salinity, control the first reverse osmosis device to output the treated seawater to the second reverse osmosis device, and determine the third flow rate of the treated seawater; the controller is further configured to: set the fourth flow rate of the freshwater at the freshwater interface according to the second flow rate and the second salinity, and then control the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and output it from the freshwater outlet of the system.

3. The system according to claim 2, characterized in that, The controller is also configured to: when the second salinity exceeds the first set salinity, control the first reverse osmosis device to output the treated seawater to the concentrated water outlet of the system.

4. The system according to claim 2, characterized in that, The controller is also configured to: detect the third salinity of the seawater treated by the filtration device; when the third salinity exceeds the second set salinity, control the filtration device to output the treated seawater to the concentrated water outlet of the system; and when the third salinity does not exceed the second set salinity, control the filtration device to output the treated seawater to the first reverse osmosis device.

5. A control method for seawater desalination, said control method being based on a seawater desalination control system as described in any one of claims 1 to 4, wherein the executing entity of the seawater desalination control method is a controller, characterized in that, The method includes: in response to a water supply request for a first salinity, determining the freshwater demand for the first salinity and the available freshwater supply of the system; when the available freshwater supply is greater than or equal to a set threshold, first controlling the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet and determining the first flow rate of the treated seawater; based on the first flow rate and the first salinity, setting a second flow rate of the freshwater at the freshwater interface, and then controlling the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and outputting it from the freshwater outlet of the system.

6. The method according to claim 5, characterized in that, After determining the freshwater demand at the first salinity and the available freshwater in the system in response to a water supply request at the first salinity, the method further includes: when the available freshwater is less than a set threshold, first controlling the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet; detecting the second salinity of the seawater treated by the first reverse osmosis device; when the second salinity does not exceed the first set salinity, controlling the first reverse osmosis device to output the treated seawater to the second reverse osmosis device, and determining the third flow rate of the treated seawater; setting the fourth flow rate of the freshwater at the freshwater interface based on the second flow rate and the second salinity, and then controlling the second reverse osmosis device to treat the freshwater at the freshwater interface and the treated seawater, and outputting it from the freshwater outlet of the system.

7. The method according to claim 6, characterized in that, After detecting the second salinity of the seawater treated by the first reverse osmosis device, the method further includes: when the second salinity exceeds the first set salinity, controlling the first reverse osmosis device to output the treated seawater to the concentrated water output port of the system.

8. The method according to claim 6, characterized in that, Before detecting the second salinity of the seawater treated by the first reverse osmosis device, the method further includes: detecting the third salinity of the seawater treated by the filtration device; when the third salinity exceeds the second set salinity, controlling the filtration device to output the treated seawater to the concentrated water outlet of the system; when the third salinity does not exceed the second set salinity, controlling the filtration device to output the treated seawater to the first reverse osmosis device.

9. A control device for seawater desalination, characterized in that, A control system for seawater desalination according to any one of claims 1 to 4, the device comprising: a response module, configured to determine the freshwater demand of the first salinity and the available freshwater quantity of the system in response to a water supply request for a first salinity; a determination module, configured to, when the available freshwater quantity is greater than or equal to a set threshold, first control the filtration device and the first reverse osmosis device to treat the seawater at the seawater inlet and determine the first flow rate of the treated seawater; and a control module, configured to, based on the first flow rate and the first salinity, set a second flow rate of the freshwater at the freshwater outlet, and then control the second reverse osmosis device to treat the freshwater at the freshwater outlet and the treated seawater, and output the treated seawater from the freshwater outlet of the system.

10. A control device for seawater desalination, characterized in that, The device includes a processor connected to a memory for storing a computer program; the processor is configured to execute the computer program to implement the method according to any one of claims 5 to 8.

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