One-key start-stop and blank screen operation control system for seawater desalination

Abstract

The invention relates to a control system for one-key start-stop and black screen operation for seawater desalination, and the control system is configured as follows: on the basis of initial demand information, initial output end information and an initial available number of process monomers in a process unit, a black screen operation is performed on the basis of the initial demand information, the initial output end information and the initial available number; determining the initial demand information, the initial output end information and the corresponding relationship between the demand quantity of the plurality of process monomers and the plurality of gears; the current available number of the process monomers is obtained to determine the current maximum effective gear; current demand information is obtained, a current demand gear corresponding to the current demand information is determined based on the corresponding relation, and the current demand gear corresponds to one of the multiple gears; a current available gear is determined based on the determined current required gear and the determined maximum effective gear. The control system can realize one-key start-stop and automatic load lifting of the sea water desalination device, shortens the start time and load lifting time of the whole plant, and improves the automatic operation level of the sea water desalination plant.

Description

Technical Field

[0001] The present invention relates to the fields of industrial automation control technology and seawater desalination technology, and in particular to a one-button start / stop and black-screen operation control system for seawater desalination. Background Art

[0002] At present, in the control system of traditional seawater desalination projects, the system start and stop, load lifting, etc. usually need to be completed by operators manually starting or stopping each unit equipment step by step according to complex processes. This not only causes a long startup time, but also increases the risk of equipment damage or safety accidents due to human operating errors. At the same time, the seawater desalination system usually contains multiple key equipment and links, and the failure of any link may have a serious impact on the entire system. In the case of multiple faults at the same time, the operator cannot immediately determine the direct cause of the fault, resulting in the inability to eliminate the equipment fault in time, affecting production efficiency and system safety.

[0003] In addition, in general, the operating data of the membrane system in the traditional seawater desalination system is manually entered by the operator, and there is no automatic comparison and calculation of the standard flow rate and standard desalination rate of the membrane system, and there is a lack of a closed-loop link to guide production based on production data. This will result in the membrane system problems not being discovered in the first place, which will affect the life and performance of the membrane system in the long term.

[0004] Therefore, the control system of traditional seawater desalination projects has problems such as complex system operation, slow fault response, low intelligence level, and rough operation. An efficient and reliable one-button start and stop and black screen operation control system is needed. Summary of the invention

[0005] The present invention proposes a control system for one-button start / stop and black screen operation of seawater desalination, the control system comprising: one or more controllers, including a plant-level controller, a process unit-level controller, a process monomer-level controller and an equipment-level controller, wherein the plant-level controller is configured to: determine the correspondence between the initial demand information, the initial output terminal information and the initial available number of process monomers in the process unit, the initial demand information, the initial output terminal information and the demand number of multiple process monomers and multiple gears, obtain the current available number of process monomers, and determine the current maximum effective gear, wherein the maximum effective gear corresponds to one of the multiple gears. , obtain current demand information, and based on the corresponding relationship, determine the current demand gear corresponding to the current demand information, wherein the current demand gear corresponds to one of multiple gears, and determine the current available gear based on the determined current demand gear and the determined maximum effective gear, wherein the current available gear corresponds to one of the multiple gears, and based on the demand quantity of each process unit corresponding to the determined current available gear, generate and send a first control request to the process unit-level controller, wherein the first control request includes control information about the number of process units to be started and stopped in each process unit and the start and stop order between each process unit.

[0006] According to an embodiment of the present invention, the initial demand information is used to indicate the initial required water volume input by the user, the current demand information is used to indicate the current required water volume input by the user, the initial output end information is used to indicate the initial liquid level of the water production pool, the initial available number of process cells is determined by the process cell-level controller based on the initial state of the core equipment in the process cell, and the current available number of process cells is determined by the process cell-level controller based on the current state of the core equipment in the process cell.

[0007] According to an embodiment of the present invention, a process unit-level controller is configured to generate and send a second control request to a process cell-level controller in a process unit based on a received first control request, wherein the second control request includes a control request for the process cell; the process cell-level controller is configured to generate and send a third control request to a device-level controller in the process cell based on the received second control request, wherein the third control request includes a control request for the device in the process cell; and multiple device-level controllers are configured to control the devices in the process cell based on the received third control request.

[0008] According to an embodiment of the present invention, one or more controllers have at least one of a main mode and a sub-mode, wherein the main mode includes at least one of a stop mode, a production mode, a sequential control maintenance mode and a manual maintenance mode, and the sub-mode includes at least one of a fully automatic mode, a semi-automatic mode and a manual mode.

[0009] According to an embodiment of the present invention, the process unit includes a reverse osmosis system, the reverse osmosis system includes a first-stage reverse osmosis system and a second-stage reverse osmosis system, each of the first-stage reverse osmosis system and the second-stage reverse osmosis system respectively includes a plurality of reverse osmosis membrane groups, wherein the required number of reverse osmosis membrane groups of each of the first-stage reverse osmosis system and the second-stage reverse osmosis system is determined based on the determined number of reverse osmosis membrane groups in the current demand gear and the determined number of reverse osmosis membrane groups in the maximum effective gear.

[0010] According to an embodiment of the present invention, the process unit includes multiple pretreatment process units, each of the multiple pretreatment process units includes multiple pretreatment process monomers, wherein the required number of the multiple pretreatment process monomers is determined based on the number of corresponding pretreatment process monomers in the determined current demand gear and the number of corresponding pretreatment process monomers in the determined maximum effective gear.

[0011] According to an embodiment of the present invention, the plurality of pretreatment process units include an inclined tube sedimentation tank, a dual-medium pressure filter water pump, a dual-medium pressure filter and a safety filter.

[0012] According to an embodiment of the present invention, the required number of reverse osmosis membrane groups in each of the first-stage reverse osmosis system and the second-stage reverse osmosis system is further determined according to the current status of core devices in the plurality of pretreatment process units.

[0013] According to an embodiment of the present invention, the plant-level controller is further configured to: obtain current status of core equipment in multiple process units, adjust currently available gears based on changes in the current status of the core equipment in the multiple process units obtained, and generate and send an adjusted first control request to one or more of the multiple process unit-level controllers based on the demand quantity of each process unit corresponding to the adjusted currently available gear.

[0014] According to an embodiment of the present invention, the working process of the plurality of reverse osmosis membrane groups in the reverse osmosis system includes a plurality of steps, and the plurality of reverse osmosis membrane groups are started in parallel in the plurality of steps based on the required number of reverse osmosis membrane groups.

[0015] According to an embodiment of the present invention, based on the reduction in the required number of reverse osmosis membrane groups, a reverse osmosis membrane group among the plurality of reverse osmosis membrane groups that is closest to the stop sequence among the plurality of sequences enters the stop sequence.

[0016] According to an embodiment of the present invention, based on a failure of one or more reverse osmosis membrane groups of a plurality of reverse osmosis membrane groups, one or more reverse osmosis membrane groups enter a stop sequence, and one or more reverse osmosis membrane groups closest to the sequence of the one or more reverse osmosis membrane groups enter a start-up sequence among the plurality of sequences.

[0017] According to an embodiment of the present invention, the control system is also configured to collect operating parameters, water quality parameters and standard parameters of the reverse osmosis system, and calculate a standardized calculation table including multiple standardized data based on the operating parameters, water quality parameters and standard parameters according to a standardized calculation formula. The control system also includes a historical database and a data analysis management system, which receive the standardized calculation table, and the data analysis management system analyzes the performance of the reverse osmosis system based on the multiple standardized data in the received standardized calculation table.

[0018] According to an embodiment of the present invention, the operating parameters include pressure, temperature, system recovery rate, and feed water concentration; the water quality parameters include the flow rate of product water and concentrated water in each section, conductivity, total dissolved concentration, pollution index, and multiple standardized data including standardized flow rate and standardized desalination rate.

[0019] According to an embodiment of the present invention, the control system is configured to control a seawater desalination system, which includes a water intake system, a pretreatment system, a reverse osmosis system, a water delivery system, and one or more auxiliary systems.

[0020] According to an embodiment of the present invention, a seawater desalination system includes multiple backup devices, and one or more of the multiple backup devices are virtual instruments, wherein the virtual instruments are obtained by virtual calculation based on the correlation with other devices in the seawater desalination system, and when a main device corresponding to the backup device fails, the backup device automatically replaces the main device.

[0021] In the present invention, the proposed one-button start and stop and black-screen operation control system for seawater desalination highly concentrates the process unit systems of the entire plant in the same control system to realize an integrated system. It can be combined with the control system-related software and hardware platform to efficiently and conveniently realize the one-button start and stop of the seawater desalination device and automatic load increase and decrease, shortening the startup time and load increase and decrease time of the entire plant, thereby improving the automation operation level of the seawater desalination plant, realizing black-screen and fully automatic operation of the entire plant, extending the continuous working time of the entire plant, and achieving the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other aspects, features and advantages of specific embodiments of the present invention will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0023] Figure 1is a block diagram showing a control system for one-key start / stop and black screen operation for seawater desalination provided by an embodiment of the present invention;

[0024] Figure 2 is a flow chart showing the generation of control requests to control different numbers of process units provided by an embodiment of the present invention;

[0025] Figure 3 is a diagram showing a schematic corresponding relationship between the initial available number of process monomers in a process unit provided by an embodiment of the present invention and a plurality of gears;

[0026] Figure 4 is a flow chart showing the availability and required quantity determination of process monomers in a key process unit provided by an embodiment of the present invention;

[0027] Figure 5A is a diagram showing the parallel startup of the RO membrane group provided by an embodiment of the present invention;

[0028] Figure 5B is a diagram showing the exit start-up of the RO membrane group provided by an embodiment of the present invention;

[0029] Figure 5C is a diagram showing the failure shutdown and startup of the RO membrane group provided by an embodiment of the present invention;

[0030] Figure 6 is a graph showing the normalization of membrane system performance provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Before proceeding to the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used throughout the present invention. The terms "include" and "comprises" and their derivatives mean including but not limited to. The term "controller" or "control unit" refers to any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and / or firmware. For example, a controller may include, for example, an application specific integrated circuit (ASIC), a general or dedicated central processing unit (CPU), a digital signal processor (DSP), and a programmable logic device, such as a field programmable gate array (FPGA). The controller may be manufactured as a single printed circuit board (PCB) or distributed on several interconnected PCBs. The controller may contain other processing circuits, for example, a controller may include two processing circuits such as an FPGA and a CPU interconnected on a PCB. The functions associated with any particular controller may be centralized or distributed, whether local or remote. Controller. The phrase "at least one", when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be required. For example, "at least one of A, B, and C" includes any one of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance or ranking. In the embodiments of the present disclosure, unless otherwise explicitly stated, "connection" does not mean that it must be "directly connected" or "directly in contact", but only needs to be electrically connected.

[0032] Definitions for other specific words and phrases are provided throughout the present invention. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior and future uses of such defined words and phrases.

[0033] The various embodiments of the principles of the present invention described in conjunction with the accompanying drawings in the present invention are only used as illustrations, and should not be interpreted as limiting the scope of the present invention in any way. It will be appreciated by those skilled in the art that the principles of the present invention can be implemented in any appropriately arranged system or device. In some cases, the actions described in the present invention can be performed in different orders, and still can achieve the desired result. In addition, the process described in the accompanying drawings does not necessarily require the specific order shown or the order in sequence to achieve the desired result. In a specific embodiment, multitasking and parallel processing may be advantageous.

[0034] The text and drawings are provided as examples only to help understand the present invention. They should not be interpreted as limiting the scope of the claims attached to the present invention in any way. Although certain embodiments and examples have been provided, it is clear to those skilled in the art based on the content of the present invention that the embodiments and examples shown may be changed without departing from the scope of the present invention.

[0035] Figure 1 1 is a block diagram showing a control system 100 for one-key start / stop and black screen operation for seawater desalination provided by an embodiment of the present invention. Seawater desalination can be used to refer to the process of desalinating seawater to produce fresh water.

[0036] refer to Figure 1 The control system 100 for one-button start / stop and black screen operation of seawater desalination can be configured to control the seawater desalination system. The control system 100 can include four levels, namely a plant-level controller 101, a process unit-level controller 102, a process monomer-level controller 103 and an equipment-level controller 104.

[0037] The plant-wide controller 101, the process unit-level controller 102, the process monomer-level controller 103, and the equipment-level controller 104 may have at least one of a main mode and a sub-mode, wherein the main mode may include at least one of a stop mode, a production mode, a sequential control maintenance mode, and a manual maintenance mode, and the sub-mode may include at least one of a full-automatic mode, a semi-automatic mode, and a manual mode. The plant-wide controller 101, the process unit-level controller 102, the process monomer-level controller 103, and the equipment-level controller 104 may have the same main mode and sub-mode to ensure the consistency of the plant-wide operation and realize the efficiency, coordination, and safety of the system.

[0038] In the control system 100, the plant-level controller 101 can be configured to coordinate the various process unit-level controllers, mainly coordinating the number of process units to be started and stopped in each process unit and the start and stop sequence between each process unit. The process unit-level controller 102 can be configured to coordinate the various process units in the corresponding process unit according to the control request from the plant-level controller 101 and the availability of each process unit in the corresponding process unit. For example, the process unit-level controller 102 can coordinate the number of process units to be started and stopped inside the corresponding process unit and the start and stop sequence between each process unit inside the corresponding process unit. The process unit-level controller 103 can be configured to generate and send control requests for equipment in the process unit to the equipment-level controller according to control requests from the corresponding process unit-level controller and other process unit-level controllers. The equipment-level controller 104 can be configured to control equipment in the process unit, such as valves, motors, instruments, etc., according to control requests from the corresponding process unit-level controller 103.

[0039] Figure 2 is a flow chart showing the generation of control requests to control different numbers of process units provided by an embodiment of the present invention. Figure 2 The steps are depicted to be performed in a specific order for the purpose of illustration and discussion. Using the disclosure provided herein, one of ordinary skill in the art will appreciate that the steps of any method discussed herein may be adjusted, rearranged, expanded, omitted or modified in various ways without departing from the scope of the present disclosure.

[0040] refer to Figure 2 In order to ensure the stability and continuity of water production in the desalination plant and avoid frequent start and stop of the process units of the reverse osmosis system, the control system 100 can generate and send control requests to control different numbers of process units when the user inputs different water requirements.

[0041] In some embodiments, the control system 100 may determine the correspondence between the initial demand information, the initial output terminal information, the initial available number of process units in the process unit and the plurality of gears according to the initial demand information, the initial output terminal information, and the initial available number of process units in the process unit. The plurality of gears may correspond to the demand numbers of a plurality of different process units, respectively.

[0042] In some embodiments, the initial demand information can be used to indicate the initial demand water volume input by the user, the initial output terminal information can be used to indicate the initial liquid level of the water production pool, and the initial available number of process cells can be determined by the process cell level controller based on the initial state of the core equipment in the process cell. In some embodiments, the core equipment can be, for example, a valve, a motor, etc.

[0043] In some embodiments, the plant-wide controller 101 in the control system 100 can divide the process units of the entire plant into different levels according to the water demand based on the initial water demand input by the user, the initial liquid level of the water production pool, and the initial available number of process units, that is, determine the correspondence between the initial water demand input by the user, the initial liquid level of the water production pool, and the initial available number of process units and multiple gears.

[0044] Figure 3 It is a diagram showing a schematic correspondence between the initial available number of process monomers in a process unit provided by an embodiment of the present invention and a plurality of gears.

[0045] In some embodiments, Figure 3 As shown in the figure, each reverse osmosis membrane group in the reverse osmosis system process unit corresponds to a fixed water production rate. According to the initial water demand input by the user, the initial liquid level of the water production pool and the available number of reverse osmosis membrane groups in the whole plant, six gears are determined, and the corresponding demand quantity of each process unit in the whole plant in different gears is clarified.

[0046] In some embodiments, the control system 100 can obtain the current available number of each process cell in real time to determine the current maximum effective gear, wherein the maximum effective gear corresponds to one of the multiple gears. In some embodiments, the current available number of process cells can be determined by the process cell level controller based on the current state of the core equipment in the process cell. In some embodiments, the core equipment can be, for example, a valve, a motor, etc.

[0047] In some embodiments, Figure 3 As shown in , the maximum effective gear is calculated based on the currently available number of process monomers in the process unit. The process unit can be, for example, one or more water inlet pumps, one or more inclined tube sedimentation tanks, one or more dual media pressure filter (Dual Media Pressure Filter, DMPF) feed pumps, one or more dual media pressure filters, one or more security filters (Cartridge Filter, CF), one or more first stage reverse osmosis systems (Reverse Osmosis 1, RO1), one or more second stage reverse osmosis systems (RO2), one or more water production tanks and one or more water production pumps.

[0048] In some embodiments, a plurality of inclined tube sedimentation tanks may be referred to as process units, and one of the plurality of inclined tube sedimentation tanks may be referred to as a process monomer. In some embodiments, RO1 may be referred to as a process unit, and the RO1 reverse osmosis membrane group in RO1 may be referred to as a process monomer.

[0049] In some embodiments, for example, the number of currently available water inlet pumps among multiple water inlet pumps is 3, the number of currently available inclined tube sedimentation tanks among multiple inclined tube sedimentation tanks is 4, the number of currently available DMPFs among multiple DMPFs is 6, the number of currently available CFs among multiple CFs is 11, the number of currently available RO1 reverse osmosis membrane groups among RO1 is 6, the number of currently available RO2 reverse osmosis membrane groups among RO2 is 5, the number of currently available water production tanks among multiple water production tanks is 1, and the number of currently available water production pumps among multiple water production pumps is 2. Then, due to the limitation of the currently available number of DMPFs, the current maximum effective gear can be determined as gear 4.

[0050] In some embodiments, the control system 100 may obtain current demand information, and determine a current demand gear corresponding to the current demand information based on the initial demand information, the initial output terminal information, and the correspondence between the demand quantities of multiple different process units and multiple gears, wherein the current demand gear corresponds to one of the multiple gears. Figure 3 As shown in , according to the current required water volume input by the user, it is determined that the current required gear can be 5 gears.

[0051] In some embodiments, the control system 100 may determine the currently available gear based on the currently required gear and the currently available gear, wherein the currently available gear corresponds to one of the plurality of gears. Figure 3 As shown in , based on the determined current required gear being 5th gear and the determined maximum effective gear being 4th gear, it is determined that the currently available gear is 4th gear.

[0052] In some embodiments, the control system 100 can generate and send a first control request to the process unit level controller according to the required number of each process unit corresponding to the determined currently available gear, wherein the first control request includes control information about the number of process units to be started and stopped in each process unit and the start and stop order between each process unit.

[0053] In some embodiments, the seawater desalination system may include a water intake unit, a pretreatment system, a reverse osmosis system, a water delivery pump station, and one or more auxiliary systems, wherein the one or more auxiliary systems may include a dosing system, a co-auxiliary system, a water quality monitoring system, and the like.

[0054] Figure 4 It is a flow chart showing the availability and required quantity judgment of process monomers in a key process unit provided by an embodiment of the present invention. Figure 4The steps are depicted to be performed in a specific order for the purpose of illustration and discussion. Using the disclosure provided herein, one of ordinary skill in the art will appreciate that the steps of any method discussed herein may be adjusted, rearranged, expanded, omitted or modified in various ways without departing from the scope of the present disclosure.

[0055] The desalination system may include two main process systems, a pretreatment system and a reverse osmosis system. In some embodiments, the pretreatment system may include a plurality of pretreatment process units, such as an inclined tube sedimentation tank, a dual-media pressure filter water pump, a dual-media pressure filter, and a security filter. Each of the plurality of pretreatment process units may include a plurality of pretreatment process monomers, such as a first inclined tube sedimentation tank, a second inclined tube sedimentation tank, and the like. In some embodiments, the reverse osmosis system may include a plurality of process units. For example, the reverse osmosis system may include a first-stage reverse osmosis system and a second-stage reverse osmosis system. The process units, the first-stage reverse osmosis system and the second-stage reverse osmosis system may include a plurality of process monomers, for example, each of the first-stage reverse osmosis system and the second-stage reverse osmosis system includes a plurality of reverse osmosis membrane groups, respectively.

[0056] refer to Figure 4 At step 401, the required number of reverse osmosis membrane groups of each of the first-stage reverse osmosis system and the second-stage reverse osmosis system may be determined based on the determined number of reverse osmosis membrane groups in the current demand gear and the determined number of reverse osmosis membrane groups in the maximum effective gear. In some embodiments, the required number of reverse osmosis membrane groups may be the smaller number between the determined number of reverse osmosis membrane groups in the current demand gear and the determined number of reverse osmosis membrane groups in the maximum effective gear. In some embodiments, the number of reverse osmosis membrane groups in the current demand gear and the number of reverse osmosis membrane groups in the maximum effective gear may be determined by the plant-wide controller 101 in the control system 100. In some embodiments, the required number of reverse osmosis membrane groups of each of the first-stage reverse osmosis system and the second-stage reverse osmosis system may be determined by the plant-wide controller 101 in the control system 100.

[0057] At step 402, a pretreatment system request table may be generated to request a corresponding number of pretreatment process units based on the required number of reverse osmosis membrane groups determined at step 401. In some embodiments, the pretreatment system request table may be generated by the process unit level controller 102 in the control system 100.

[0058] At step 403, the pretreatment system operation table and the whole plant available table can be determined according to the current state of the core equipment in each process unit. Among them, the pretreatment system operation table and the whole plant available table can be used to indicate the available or running number of process units in the pretreatment process unit and the available number of each process unit in the system. In some embodiments, the pretreatment system operation table and the whole plant available table can be determined according to the production status of the inclined tube sedimentation tank, the operating status of the DMPF feed water pump and the filtration status of the DMPF. In some embodiments, the pretreatment system operation table and the whole plant available table can be determined according to the current state of the reverse osmosis membrane group. In some embodiments, at step 403, the operation state of each process unit in the pretreatment process unit can be controlled by the process unit level controller 102 corresponding to the pretreatment process unit according to the pretreatment system request table generated at step 402. In some embodiments, the process unit level controller 102 in the control system 100 can obtain the current state of the core equipment in each process unit. In some embodiments, the pretreatment system operation table and the whole plant available table can be generated by the process unit level controller 102 in the control system 100.

[0059] At step 404, a plant-wide reverse osmosis system request table may be determined based on the required number of reverse osmosis membrane groups determined at step 401 and the pretreatment system operation table and the plant-wide available table determined at step 403. In some embodiments, the plant-wide reverse osmosis system request table may be used to indicate the required number of reverse osmosis membrane groups of each of the first-stage reverse osmosis system and the second-stage reverse osmosis system. In some embodiments, the plant-wide reverse osmosis system request table may be generated by the process unit-level controller 102 in the control system 100.

[0060] In some embodiments, the control system 100 can additionally implement fault handling and production adjustments for core equipment failures in the process unit (eg, Figure 4 ).

[0061] At step 405, the current status of the core equipment in each process unit can be obtained, and a pretreatment system emergency table is generated based on the failure of the core equipment in the process unit. The generated pretreatment system emergency table is sent to the plant-wide reverse osmosis system request table to adjust the required number of reverse osmosis membrane groups and the pretreatment system request table (such as Figure 4 In some embodiments, the process unit level controller 102 in the control system 100 may obtain the current status of the core equipment in each process unit. In some embodiments, the pre-processing system emergency table may be generated by the process unit level controller 102 in the control system 100.

[0062] In some embodiments, when one or more of the reverse osmosis membrane groups in the first-stage reverse osmosis system fails, the pretreatment system operation table and the plant-wide availability table can be adjusted and sent to the plant-wide reverse osmosis system request table. The plant-wide reverse osmosis system request table adjusts the required number of reverse osmosis membrane groups and the pretreatment system request table based on the received adjusted pretreatment system operation table and the plant-wide availability table, that is, reduces the required number of reverse osmosis membrane groups and pretreatment process monomers and generates a control request. The control request indicates that the fully automatic start and stop of the process monomers in each process unit is realized in accordance with the execution order from front to back in the process flow.

[0063] The start and stop process of each process unit can adopt a fully automatic queue method according to the required quantity, combined with the availability, running time, stop time and other factors of the process unit in each process unit, and automatically select the appropriate process unit for start and stop according to the set selection principle. The control system can automatically determine the availability of each process unit and automatically send the required quantity of the process unit to the pretreatment system and reverse osmosis system, realizing the fully automatic start and stop and quantity matching of the process units in the whole plant from front to back.

[0064] In conventional seawater desalination projects, it takes about 60 minutes for one RO group to start from a stopped state to an operational state. If the plant has 6 groups of 1st-level RO and 5 groups of 2nd-level RO, it will take more than 6 hours to start. And when there is a problem with the membrane group being started, it will take more time to complete the startup. Therefore, in order to shorten the startup time of the seawater desalination plant and speed up the rapid response replacement time during the startup of the membrane group, the multi-step parallel startup method of each reverse osmosis membrane group in the reverse osmosis system is adopted.

[0065] In some embodiments, the overall process of different RO membrane groups can be divided into 10 main steps, namely: stop step, pre-start step, pre-start completion step, bypass flushing step, high-pressure pump start step, water quality detection step, production step, shutdown flushing step, stop step and chemical cleaning (CIP) step. According to the 10 main steps and states, RO1 can be divided into 12 queues, and RO2 can be divided into 10 queues and CIP queues. The queues can include: stop priority 1 queue (stop unfinished flushing), stop priority 2 queue (stop completed flushing), pre-start queue, pre-start completion queue, bypass flushing queue (RO1 exclusive), high-pressure pump start queue, water quality test queue (RO1 exclusive), production queue, shutdown positive wash queue, stop queue, flushing queue, CIP queue (RO1 and RO2 common) and unavailable queue. RO1 and RO2 queues can adopt the first-in-first-out (FIFO) principle, and the number of simultaneous startups allowed for each queue can be modified. The default is that each queue only allows one set of RO to start the same step at the same time.

[0066] Figure 5A 2 is a diagram showing the parallel startup of the RO membrane groups provided by an embodiment of the present invention.

[0067] The steps of RO can be divided according to the process flow, and can be started in parallel according to the required number of RO membrane groups. In some embodiments, during the startup phase of the whole plant, each RO membrane group is started in parallel at different steps according to the queue. According to the above implementation, it is possible to shorten the startup time of the whole plant RO, and ensure that when a certain RO membrane group fails, other RO membrane groups can directly replace the current membrane group from the adjacent step to continue starting.

[0068] refer to Figure 5A , the required number of reverse osmosis membrane groups is 6 groups of 1-stage RO, and the 6 groups of 1-stage RO are started in sequence from front to back in the process. At a certain moment in the startup process, the 1st group of 1-stage RO proceeds to the production step in the process, the 2nd group of 1-stage RO proceeds to the test step, and the 3rd to 6th groups of 1-stage RO respectively proceed to the high-pressure pump start step, the pre-start completion step, the pre-start step, and the stop priority 1 step. In the next process, the 2nd group of 1-stage RO can proceed from the test step to the production step, and at the same time, the 3rd group of 1-stage RO can proceed from the high-pressure pump start step to the test step, the 4th group of 1-stage RO can proceed from the pre-start step to the high-pressure pump start step, and the 5th to 6th groups of 1-stage RO can proceed to the next step in the process at the same time.

[0069] Figure 5B 3 is a diagram showing the deactivation of the RO membrane group provided by an embodiment of the present invention.

[0070] When the demand quantity decreases during the startup phase, the membrane group closest to the stop sequence can automatically exit the startup sequence and enter the stop sequence. In some embodiments, the closest to the stop sequence refers to the step at the front of the process.

[0071] refer to Figure 5B ,When the required number of reverse osmosis membrane groups changes from 5 groups to 4 groups, the membrane group closest to the stop sequence, that is, the 5th group 1st stage RO, proceeds to the shutdown forward flushing sequence.

[0072] Figure 5C It is a diagram showing the failure shutdown and startup of the RO membrane group provided by the embodiment of the present invention.

[0073] If a RO membrane group fails during the startup process, the failed RO membrane group enters the shutdown sequence, and the new RO membrane group continues to start up.

[0074] refer to Figure 5C , the required number of reverse osmosis membrane groups is 5 groups of 1st-level RO. At a certain moment in the startup process, the 1st-level RO in the production step fails, and the 1st-level RO proceeds to the shutdown forward flushing step. In the next process, the 2nd to 5th groups of 1st-level RO proceed to the next step in the process at the same time, and the 6th group of 1st-level RO proceeds from the stop priority 1 step to the pre-start step to perform startup.

[0075] During the startup process of each RO membrane group, they are all started in parallel according to the sub-step sequence, which saves startup time. If a certain RO membrane group fails, the other RO membrane groups at the front of the process can proceed to the subsequent process at the first time, saving the emergency handling time of the failure.

[0076] The reverse osmosis system is the core of the desalination process, so the standardization of reverse osmosis data plays a very important role in the operation and management of desalination plants. Reverse osmosis data standardization can not only ensure the accuracy of data, improve the accuracy of performance evaluation and monitoring, and accelerate the speed of fault diagnosis and troubleshooting, but also optimize the operation and maintenance strategy of the reverse osmosis system and improve management efficiency.

[0077] Figure 6 is a graph showing the normalization of membrane system performance provided by an embodiment of the present invention.

[0078] refer to Figure 6, the operating parameters, water quality parameters and standard parameters of the reverse osmosis system operation can be collected by the control system. In some embodiments, the operating parameters may include, for example, pressure, temperature, system recovery rate, feed water concentration, etc., the water quality parameters may include, for example, the flow rate of each section of product water and concentrate, conductivity / total dissolved solids (TDS), pollution index (SDI), lubrication flow, overflow flow, etc., and the standard parameters may be provided by the reverse osmosis membrane element manufacturer, such as theoretical lubrication flow, mixing rate, feed water TDS, concentrate TDS, produced water TDS, produced water theoretical conductivity, permeability, salt permeability, theoretical water production, concentrate osmotic pressure, transmembrane pressure difference, standardized pressure drop, membrane group recovery rate, etc.

[0079] In some embodiments, the theoretically achievable standardized flow rate and standardized salt rejection rate may be calculated based on standard parameters of the reverse osmosis membrane element manufacturer.

[0080] In some embodiments, Figure 6 As shown, standardized calculation formulas and standardized data tables can be customized, and the standardized data tables can be sent to the historical database and data analysis management system in the control system. In addition, the data management system can analyze the performance of the reverse osmosis system based on the standardized data tables to generate alarms or operation prompts. Additionally, curves can be formed and reports can be summarized based on the standardized data tables to guide the operation of the desalination plant.

[0081] In some embodiments, the control system can comprehensively record various operating data during the operation process, including accidental events (such as SDI, pH value and pressure abnormalities, shutdowns, etc.), so as to conduct a comprehensive analysis of the desalination operation later.

[0082] By automatically collecting, calculating, and organizing the reverse osmosis data in the desalination process, and saving the standardized data in a standardized data table, it is easy to perform performance analysis based on the reverse osmosis standardized data table. The use of automatic standardized calculation can save a lot of manual statistics and analysis costs for operators, and also reduce the error rate of manual entry and analysis by operators. The standardization of reverse osmosis operation data is of great significance to ensure the accuracy of system performance evaluation, timely discover and solve problems, and formulate reasonable maintenance plans. It can realize functions such as remote monitoring, data analysis, and intelligent scheduling, thereby improving the operating efficiency and management level of the entire project.

[0083] The present disclosure also provides for configuring spare equipment and spare instruments in the desalination system. According to the order of the process flow, the importance of the equipment (such as motors, valves, instruments, etc.) in the key process units of the whole plant and the degree of their impact on the whole plant process are sorted out. For core equipment, you can consider configuring spare equipment, adding automatic control valves, redundant instruments, etc. At the same time, add functions for key equipment standby switching and instrument redundant switching in the control scheme and control program. In some embodiments, multiple spare devices can be set for key core equipment.

[0084] In some embodiments, for the key instruments of the whole plant, if no redundant instruments are configured, the corresponding virtual redundant instruments can be virtually calculated based on the correlation between the previous and next process units. In the case of failure or inaccuracy of the main instrument, it can automatically switch to the virtual instrument. The main instrument can be calibrated and compared in real time, and the backup virtual instrument can be automatically switched in the event of a failure of the main instrument to ensure the continuity and integrity of the water plant process.

[0085] Although the present invention has been described with exemplary embodiments, various changes and modifications may be suggested to one skilled in the art. The present invention is intended to encompass such changes and modifications as fall within the scope of the appended claims.

[0086] Any description in the present invention should not be construed as implying that any particular element, step, or function is an essential element that must be included in the claims scope. The scope of the patented subject matter is limited solely by the claims.

Claims

1. A control system for one-button start / stop and black screen operation for seawater desalination, the control system comprising: One or more controllers, including plant-wide controllers, process unit-level controllers, process monomer-level controllers, and equipment-level controllers, Among them, the plant-level controller is configured as: Based on the initial demand information, the initial output end information and the initial available number of process monomers in the process unit, the corresponding relationship between the initial demand information, the initial output end information and the required number of multiple process monomers and the multiple gears is determined. Obtaining the currently available number of process units to determine the current maximum effective gear, wherein the maximum effective gear corresponds to one of the multiple gears, Acquire current demand information, and determine a current demand gear corresponding to the current demand information based on the corresponding relationship, wherein the current demand gear corresponds to one of the multiple gears, Based on the determined current required gear and the determined maximum effective gear, a currently available gear is determined, wherein the currently available gear corresponds to one of the plurality of gears, Based on the required quantity of each process unit corresponding to the determined currently available gear, a first control request is generated and sent to the process unit level controller, wherein the first control request includes control information about the quantity of process units to be started and stopped in each process unit and the start and stop order between each process unit.

2. The control system according to claim 1, wherein: The initial demand information is used to indicate the initial water demand input by the user. The current demand information is used to indicate the current water demand input by the user. The initial output terminal information is used to indicate the initial liquid level of the water production pool. The initial available number of process cells is determined by the process cell level controller based on the initial state of the core equipment in the process cell, and The currently available number of process cells is determined by the process cell level controller based on the current status of the core devices in the process cell.

3. The control system according to claim 1, wherein: The process unit level controller is configured to generate and send a second control request to a process cell level controller in the process unit based on the received first control request, wherein the second control request includes a control request for the process cell, The process cell-level controller is configured to generate and send a third control request to a device-level controller in the process cell based on the received second control request, wherein the third control request includes a control request for a device in the process cell. The plurality of device-level controllers are configured to control the devices in the process cell based on the received third control request.

4. The control system according to claim 1, wherein: The one or more controllers have at least one of a main mode and a sub-mode, wherein the main mode includes at least one of a stop mode, a production mode, a sequential control maintenance mode and a manual maintenance mode, and the sub-mode includes at least one of a fully automatic mode, a semi-automatic mode and a manual mode.

5. The control system according to claim 1, wherein: The process unit includes a reverse osmosis system, which includes a first-stage reverse osmosis system and a second-stage reverse osmosis system, each of the first-stage reverse osmosis system and the second-stage reverse osmosis system respectively including a plurality of reverse osmosis membrane groups, wherein the required number of reverse osmosis membrane groups of each of the first-stage reverse osmosis system and the second-stage reverse osmosis system is determined based on the determined number of reverse osmosis membrane groups in the current demand gear and the determined number of reverse osmosis membrane groups in the maximum effective gear.

6. The control system according to claim 5, wherein: The process unit includes a plurality of pretreatment process units, each of the plurality of pretreatment process units includes a plurality of pretreatment process monomers, wherein the required number of the plurality of pretreatment process monomers is determined based on the number of corresponding pretreatment process monomers in the determined current demand gear and the number of corresponding pretreatment process monomers in the determined maximum effective gear.

7. The control system according to claim 6, wherein: The multiple pretreatment process units include an inclined tube sedimentation tank, a dual-medium pressure filter water pump, a dual-medium pressure filter and a safety filter.

8. The control system according to claim 6, wherein: The required number of reverse osmosis membrane groups of each of the first-stage reverse osmosis system and the second-stage reverse osmosis system is further determined according to the current status of the core equipment in the plurality of pretreatment process units.

9. The control system according to claim 1, wherein: The plant-wide controller is further configured to: Obtaining the current status of the core equipment in the multiple process units, adjusting the currently available gears based on the changes in the current states of the core devices in the plurality of process cells obtained, and Based on the demand quantity of each process unit corresponding to the adjusted currently available gear, an adjusted first control request is generated and sent to one or more of the plurality of process unit-level controllers.

10. The control system according to claim 5, wherein: The working process of the plurality of reverse osmosis membrane groups in the reverse osmosis system includes a plurality of steps, and the plurality of reverse osmosis membrane groups are started in parallel in the plurality of steps based on the required number of reverse osmosis membrane groups.

11. The control system according to claim 10, wherein: Based on the decrease in the demand quantity of the reverse osmosis membrane group, a reverse osmosis membrane group among the plurality of reverse osmosis membrane groups that is closest to the stop sequence among the plurality of sequences enters the stop sequence.

12. The control system according to claim 10, wherein: Based on failure of one or more reverse osmosis membrane groups of the plurality of reverse osmosis membrane groups, the one or more reverse osmosis membrane groups enter a stop sequence, and one or more reverse osmosis membrane groups closest to the sequence of the one or more reverse osmosis membrane groups enter a start-up sequence among the plurality of sequences.

13. The control system according to claim 1, wherein: The control system is also configured to collect operating parameters, water quality parameters and standard parameters of the reverse osmosis system, and calculate a standardized calculation table including a plurality of standardized data based on the operating parameters, water quality parameters and standard parameters according to a standardized calculation formula, The control system also includes a historical database and a data analysis management system, which receive the standardized calculation table and The performance of the reverse osmosis system is analyzed by the data analysis management system based on the plurality of standardized data in the received standardized calculation table.

14. The control system according to claim 13, wherein: The operating parameters include pressure, temperature, system recovery rate, feed water concentration, The water quality parameters include the product water and concentrate flow rate of each section, conductivity, total dissolved concentration, pollution index, and The plurality of standardized data include a standardized flow rate and a standardized salt rejection rate.

15. The control system according to claim 1, wherein: The control system is configured to control a seawater desalination system, which includes a water intake system, a pretreatment system, a reverse osmosis system, a water delivery system, and one or more auxiliary systems.

16. The control system according to claim 15, wherein: The seawater desalination system comprises a plurality of backup devices, and one or more of the plurality of backup devices are virtual instruments, wherein the virtual instruments are obtained by virtual calculation according to correlation with other devices in the seawater desalination system, and When a main device corresponding to a backup device fails, the backup device automatically replaces the main device.

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