Marine reverse osmosis seawater desalination equipment system and method

Abstract

The invention relates to a marine reverse osmosis seawater desalination equipment system which comprises a raw water pretreatment module, a primary reverse osmosis module, a secondary reverse osmosis module and an energy recovery module, raw water is preliminarily filtered by the raw water pretreatment module, then pressurized by the first-stage high-pressure pump and injected into the first-stage reverse osmosis module to generate first-stage high-pressure concentrated water, and the first-stage high-pressure concentrated water pressurizes low-pressure raw water treated by the raw water pretreatment module through the energy recovery module, then pressurized by the pressure lifting pump and injected into the first-stage reverse osmosis module; the first-stage high-pressure concentrated water is pressurized by a second-stage high-pressure pump and injected into a second-stage reverse osmosis module to generate second-stage high-pressure concentrated water, and the second-stage high-pressure concentrated water is recycled; according to the equipment system, the TDS of produced water is detected, and the pressure of the primary reverse osmosis module and the pressure of the secondary reverse osmosis module are controlled, so that the equipment system realizes maximization of produced water, efficient integration of the system, complete functions, high water production efficiency, full-automatic control and wide application scene under the condition that the equipment system meets the quality requirement of the produced water.

Description

Technical Field

[0001] The invention relates to the field of seawater desalination, and in particular to a marine reverse osmosis seawater desalination equipment system. Background Art

[0002] Reverse osmosis seawater desalination equipment, the water output of the reverse osmosis membrane system is related to the inlet water pressure of the reverse osmosis membrane and the pressure difference with the produced water. The larger the pressure difference, the more significant the increase in water output, while the impact on the increase in TDS of the produced water is relatively small (TDS refers to the total amount of solutes); the water output decreases as the inlet water temperature decreases, and the inlet water temperature of the system is relatively stable, which has little impact on the change in the output water.

[0003] Existing marine reverse osmosis desalination equipment takes into account the uncertainty of environmental conditions such as water quality and temperature fluctuations. To maintain the continuous operation of the equipment system, it is necessary to continuously adjust the water flow rate, or adjust the equipment water flow rate to a lower range, or adjust the equipment to a low limit requirement state to ensure that there is no negative pressure at the inlet of the water pump in the system, avoid equipment failure, and achieve the so-called "adaptive operation". When the water quality meets the specified requirements, the water output needs to be improved.

[0004] The quality and temperature of seawater change with the position of the ship. Due to the limitations of the equipment operating environment and space, the existing reverse osmosis desalination system requires constant manual adjustment of operating parameters and has a low degree of automation. In addition, the traditional reverse osmosis desalination system has problems such as large equipment size, making it difficult to meet the miniaturization requirements for ship use. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a marine reverse osmosis seawater desalination equipment system.

[0006] The present application provides a marine reverse osmosis desalination equipment system adopts the following technical solution: A marine reverse osmosis seawater desalination equipment system, comprising: A raw water pretreatment module, wherein a seawater pump is provided at the inlet end of the raw water pretreatment module, and the seawater pump pumps raw water into the raw water pretreatment module for preliminary filtration; A primary reverse osmosis module, wherein the primary reverse osmosis module comprises a plurality of primary reverse osmosis membranes; a primary high-pressure pump is arranged between the primary reverse osmosis module and the raw water pretreatment module, and the primary high-pressure pump pumps the raw water passing through the raw water pretreatment module into the primary reverse osmosis module to produce primary produced water and primary high-pressure concentrated water; A secondary reverse osmosis module, wherein the secondary reverse osmosis module comprises a plurality of secondary reverse osmosis membranes, wherein the filtering capacity of the secondary reverse osmosis membranes is greater than the filtering capacity of the primary reverse osmosis membranes; a secondary high-pressure pump is arranged between the secondary reverse osmosis module and the primary reverse osmosis module, wherein the secondary high-pressure pump pumps the primary high-pressure concentrated water passing through the primary reverse osmosis module into the secondary reverse osmosis module, thereby generating secondary produced water and secondary concentrated water; An energy recovery module, which is arranged behind the concentrated water outlet of the first-stage reverse osmosis module, and includes an energy recovery device, a pressure boosting pump, and a regulating valve; The concentrated water inlet of the energy recovery device is connected to the concentrated water outlet of the primary reverse osmosis module, and the second regulating valve is arranged at the concentrated water outlet of the energy recovery device. The primary concentrated water produced by the primary reverse osmosis module is back-pressured and regulated by the second regulating valve at the concentrated water outlet of the energy recovery device to form primary high-pressure concentrated water; The raw water pretreatment module forms low-pressure raw water after treatment, and the low-pressure raw water enters the raw water inlet of the energy recovery device from the outlet of the raw water pretreatment module; the raw water outlet of the energy recovery device is connected to the inlet of the pressure boosting pump, and the outlet of the pressure boosting pump is connected to the outlet of the first-stage high-pressure pump; The energy recovery device recovers the pressure energy of the first-level high-pressure concentrated water and pressurizes the low-pressure raw water entering the energy recovery device. The pressure boosting pump further pressurizes the raw water pressurized by the energy recovery device to form high-pressure raw water. The pressure boosting pump pumps the high-pressure raw water into the first-level reverse osmosis module.

[0007] Preferably, a circulation pipeline 1 is provided between the concentrated water outlet end of the primary reverse osmosis module and the concentrated water inlet end of the secondary reverse osmosis module, a salinometer 1 and an electric switch valve 1 are provided on the circulation pipeline 1, a manual switch valve is provided in front of the electric switch valve 1, the salinometer 1 performs TDS detection on the primary produced water passing through the primary reverse osmosis module, the salinometer 1 is provided at one end close to the primary reverse osmosis module, the electric switch valve 1 is provided at one end close to the secondary reverse osmosis module, a fresh water outlet A is provided at one end of the circulation pipeline 1 away from the primary reverse osmosis module, and the manual switch valve is connected to the fresh water outlet A; A second flow pipeline is provided between the outlet of the first-stage reverse osmosis module and the inlet of the first-stage high-pressure pump, and a second electric switch valve is provided on the second flow pipeline, and the second electric switch valve is kept normally open; When the TDS value measured by the salinometer 1 is lower than the design requirement, the primary water production meets the requirement, and the electric switch valve 1 is opened. When the secondary water production is needed, the primary water production enters the secondary reverse osmosis module from the primary reverse osmosis module through the secondary high-pressure pump. When only the primary water production is needed, the primary water production is directly discharged from the concentrated water outlet of the primary reverse osmosis module through the manual switch valve from the fresh water outlet A for use by users. When the TDS value measured by the first salinity meter is higher than the design requirement, the TDS value of the primary produced water exceeds the range, the primary produced water does not meet the requirements, and the primary produced water is returned from the outlet of the first reverse osmosis module through the second electric switch valve to the inlet of the first high-pressure pump and is pumped into the first reverse osmosis module by the first high-pressure pump for recovery; When the TDS value measured by the salinometer 1 drops to the design requirement value, the electric switch valve 1 opens, and the electric switch valve 2 continues to remain open for 2 seconds before closing; A flow pipeline three is arranged between the concentrated water inlet end of the energy recovery device and the concentrated water outlet end of the primary reverse osmosis membrane module, and an electric switch valve three is arranged on the flow pipeline three, and the electric switch valve three is kept normally open.

[0008] By adopting the above technical solution, when the TDS value of the produced water output by the first-stage reverse osmosis membrane module exceeds the design requirement, the produced water is returned to the inlet of the first-stage high-pressure pump through the second electric switch valve as fresh water, and then pumped into the first-stage reverse osmosis module by the first-stage high-pressure pump for reuse. Under the condition that the produced water quality meets the requirements, the total amount of produced water can be increased; The primary high-pressure concentrated water output from the primary reverse osmosis module is back-pressured through a regulating valve 1 at the concentrated water outlet of the energy recovery device. The concentrated water pressure energy output from the primary reverse osmosis module can be recovered through the energy recovery device. The energy recovery device increases the pressure of the low-pressure raw water in front of the primary high-pressure pump to a pressure close to that after the primary high-pressure pump, and pressurizes it through a pressure booster pump to reach the pressure after the primary high-pressure pump, thereby achieving a pressure recovery of no less than 70% of the output pressure energy of the primary high-pressure pump. The compact structure realizes the energy-saving and miniaturization requirements of the marine reverse osmosis equipment system.

[0009] Preferably, the circulation pipeline 2 branches off with a discharge pipeline 1, an end of the discharge pipeline 1 away from the circulation pipeline 2 is provided with a concentrate main pipe, the circulation pipeline 3 is connected to the concentrate main pipe, and an end of the concentrate main pipe away from the circulation pipeline 2 is provided with a concentrate outlet; The concentrated water inlet end of the energy recovery device is provided with a pressure transmitter 1, and the concentrated water outlet end of the energy recovery device is provided with a regulating valve 2, the regulating valve 2 is connected to the concentrated water main pipe, the pressure transmitter 1 collects the pressure information of the energy recovery device and adjusts the regulating valve 2 according to the requirements of the equipment control system, so that the pressure of the primary produced water inside the primary reverse osmosis module and discharged by the primary reverse osmosis module is in the range of 90% to 95% of the working pressure, and the primary reverse osmosis module is adaptively pressure controlled; The inlet end of the circulation pipeline 3 is connected to the highest point of the concentrated water outlet of the first-stage reverse osmosis module; When the equipment system starts to work, the regulating valve 1 performs exhaust work; After the primary reverse osmosis module produces water, the regulating valve 1 adjusts the pressure inside the primary reverse osmosis module according to the detection result of the salinity meter 1 to adjust the water output of the primary water produced by the primary reverse osmosis module, thereby dynamically controlling the TDS of the primary water produced; The discharge pipeline 1 is provided with an electric switch valve 4. When the pressure in the flow pipeline 1 is too high or the primary produced water is unqualified, and the secondary high-pressure pump is not working, the electric switch valve 4 opens and discharges the primary produced water to the concentrated water main pipe; A discharge pipeline 3 is provided between the concentrated water outlet end of the secondary reverse osmosis membrane module and the concentrated water outlet end of the raw water pretreatment module, and a pressure transmitter 2, a regulating valve 3, a flow meter and a one-way valve are provided on the discharge pipeline 3. The flow meter adjusts the pressure in the discharge pipeline 3 through the regulating valve 3 according to the requirements of the system discharge flow rate, so that the secondary produced water with a low TDS value is discharged to the inlet end of the primary high-pressure pump, and the secondary produced water with a low TDS value is recycled through the primary reverse osmosis membrane module; The one-way valve is used to prevent the raw water in the pipe from flowing back; A secondary concentrated water recovery pipeline is arranged between the concentrated water inlet end of the discharge pipeline three and the inlet end of the secondary high-pressure pump, and a regulating valve four is arranged on the secondary concentrated water recovery pipeline. The pressure transmitter two collects the pressure information of the discharge pipeline three and adjusts the regulating valve four according to the requirements of the equipment control system, so that the pressure inside the secondary reverse osmosis module and the pressure of the secondary produced water discharged from the secondary reverse osmosis module are in the range of 90% to 95% of the working pressure.

[0010] By adopting the above technical solution, when the pressure in the secondary reverse osmosis membrane exceeds 95% of the working pressure, the opening of the regulating valve 3 increases, and the secondary produced water with low TDS flows to the inlet end of the primary high-pressure pump to adjust the pressure of the equipment system. When the salt meter 2 detects that the produced water of the secondary reverse osmosis membrane module exceeds the required range, the opening of the regulating valve 3 is reduced until the TDS value of the secondary produced water reaches the design lower limit control value (TDS value 80ppm); By setting the regulating valve 4, the secondary concentrated water with low TDS value output by the secondary reverse osmosis membrane module is recycled; Through the above settings and joint control, the TDS values ​​of the primary and secondary produced water are controlled within the required limit range to maximize the water production; When the pressure in the circulation pipeline 1 and the circulation pipeline 3 is too high, the electric switch valve 4 opens and discharges part of the unqualified produced water to relieve the pressure in the pipeline, maintain the normal operation of the equipment system, and realize the automatic adjustment of the pressure by the equipment system.

[0011] Preferably, the electric switch valve 3 is a three-way switching valve, one end of the electric switch valve 3 is connected to the concentrated water outlet end of the primary reverse osmosis module, the second end of the electric switch valve 3 is connected to the concentrated water inlet end of the energy recovery device, and the third end of the electric switch valve 3 is connected to a cleaning tank, and the cleaning tank is provided with a cleaning liquid for cleaning the primary reverse osmosis membrane; A cleaning pipeline 1 is provided between the outlet of the cleaning tank and the inlet of the secondary high-pressure pump, a cleaning pipeline 2 is provided between the outlet of the secondary high-pressure pump and the inlet of the primary osmosis module, an electric switch valve 5 is provided on the cleaning pipeline 1, the electric switch valve 5 is kept normally closed, and when it is necessary to clean the primary reverse osmosis membrane, the electric switch valve 5 is opened, an electric switch valve 7 is provided at the raw water inlet end of the primary reverse osmosis module, and when it is necessary to clean the primary reverse osmosis membrane, the electric switch valve 7 is switched from a disconnected state to an open state, and the electric switch valve 3 is switched from being connected to the concentrated water inlet end of the energy recovery device to being connected to the cleaning tank, so that the concentrated water inlet end of the energy recovery device is in a disconnected state; The secondary high-pressure pump pumps the cleaning liquid in the cleaning tank through the cleaning pipeline 2 to the primary reverse osmosis module. After passing through the primary reverse osmosis module, the cleaning liquid returns to the cleaning tank through the electric switch valve 3; A drain valve for draining residual liquid is arranged at the bottom of the cleaning box.

[0012] By adopting the above technical solution, the first-level reverse osmosis membrane needs to be cleaned after being used for a period of time. When the first-level reverse osmosis membrane needs to be cleaned, the electric switch valve five and the electric switch valve seven are opened, and the secondary high-pressure pump pumps the cleaning liquid in the cleaning tank from the cleaning pipeline two to the first-level reverse osmosis module. After passing through the first-level reverse osmosis module, the cleaning liquid returns to the cleaning tank through the electric switch valve three, and finally the sewage is discharged through the drain valve.

[0013] Preferably, a water supply pipeline is branched on the second circulation pipeline, and a solenoid valve is provided on the water supply pipeline. After the solenoid valve is opened, the primary water produced by the primary reverse osmosis module can be injected into the cleaning tank.

[0014] By adopting the above technical solution, when the primary reverse osmosis module can output produced water, water can be injected into the cleaning box after opening the solenoid valve to prepare a cleaning solution for chemical cleaning.

[0015] Preferably, the raw water pretreatment module includes an inlet pipeline, the inlet of the water inlet pipeline is divided into a fresh water inlet and a seawater inlet, the seawater pump is arranged at the seawater inlet, and a multi-way valve is arranged at the outlet of the water inlet pipeline, and the multiple interface ends of the multi-way valve are respectively connected with filter pipeline one, filter pipeline two, and filter pipeline three, the filter pipeline one is provided with a filter, the seawater pump pumps seawater into the inlet end of the filter through the multi-way valve, the filter pipeline two is provided with a fine filter and a safety filter, the seawater pump pumps seawater into the inlet end of the fine filter through the multi-way valve, the end of the filter pipeline three away from the multi-way valve is connected to the concentrated water main pipe, and the first-level high-pressure pump is arranged between the safety filter and the first-level reverse osmosis module.

[0016] By adopting the above technical solution, the seawater pump, the filter, the fine filter and the safety filter are connected in series, so that the structure is compact and reasonable, and more suitable for ship use.

[0017] Preferably, the multi-way valve is a multi-way reversing valve. When the filter needs to be cleaned, the multi-way valve switches the flow direction of the filter pipeline one. After passing through the multi-way valve, the seawater enters the filter from the filter outlet and returns to the multi-way valve from the filter inlet, and then the seawater is discharged from one end of the multi-way valve that is three-way connected to the filter pipeline.

[0018] By adopting the above technical solution, when the filter needs to be cleaned, the multi-way valve switches the flow direction of the filter pipeline one, and the seawater is reversely injected from the original water outlet of the filter through the seawater pump to reversely flush the filter. The sewage formed after flushing returns to the multi-way valve from the original water inlet end of the filter, and is then discharged from one end of the multi-way valve and the filter pipeline that is three-way connected to the concentrated water main pipe for discharge, thereby avoiding filter blockage, restoring the filter's filtering capacity, and maintaining the normal operation of the equipment system.

[0019] Preferably, the outlet end of the secondary reverse osmosis module is provided with a discharge pipeline 2, and the end of the discharge pipeline 2 away from the secondary reverse osmosis module is provided with a fresh water outlet B; The discharge pipeline 2 is provided with a final treatment module, and the final treatment module includes a pH adjustment solution tank and a disinfection solution tank, wherein the pH adjustment solution tank is provided with a pharmaceutical solution for adjusting the pH value of the produced water, and the disinfection solution tank is provided with a pharmaceutical solution for disinfection; The second discharge pipeline is provided with a pH detector and a second salinity meter, and the second salinity meter performs TDS detection on the produced water passing through the final treatment module; According to the result of the pH detector on the secondary reverse osmosis membrane water production, the pH solution tank automatically adjusts the appropriate flow rate of the pharmaceutical solution used to adjust the pH value of the produced water through the metering pump 1 and injects it into the discharge pipeline 2; According to the result of the second salinometer detecting the water produced by the secondary reverse osmosis membrane, the disinfection solution tank automatically adjusts the appropriate flow rate of the disinfection agent solution through the second metering pump and injects it into the second discharge pipeline.

[0020] By adopting the above technical solution, the pH of the produced water passing through the secondary reverse osmosis module is adjusted and disinfected through the pH adjustment solution tank and the disinfection solution tank, so that the produced water becomes drinking water.

[0021] Preferably, an electric switch valve 6 is provided between the salinometer 2 and the fresh water outlet B, the electric switch valve 6 is a three-way switching valve, one end of the electric switch valve 6 is connected to the discharge pipeline 2, the second end of the electric switch valve 6 is connected to the fresh water outlet B, and the third end of the electric switch valve 6 is connected to the concentrated water outlet; After the produced water is PH-adjusted and disinfected, when the PH value measured by the PH detector and the TDS value measured by the salinity meter 2 reach the design drinking water index, the produced water meets the requirements, the electric switch valve 6 is connected to the fresh water outlet B, and the produced water is discharged through the fresh water outlet B for use by users; When the pH value measured by the pH detector and the TDS value measured by the salinity meter 2 exceed the design requirements for drinking water, the electric switch valve 6 is connected to the concentrated water outlet, and the produced water is discharged through the concentrated water outlet.

[0022] By adopting the above technical solution, when the TDS value measured by the second salinity meter is higher than the design requirement, the TDS value of the produced water exceeds the range and is unqualified, the electric switch valve six is ​​switched to be connected to the concentrated water outlet, and the produced water passes through the electric switch valve six from the outlet end of the final treatment module back to the inlet of the secondary high-pressure pump and is pumped into the secondary reverse osmosis module by the secondary high-pressure pump for re-filtration to ensure the quality of the produced water and achieve the requirement of automatic output of drinking water.

[0023] Preferably, the filter is provided with an exhaust valve 1, the fine filter is provided with an exhaust valve 2, the safety filter is provided with an exhaust valve 3, and the highest point of the concentrated water outlet end of the first-stage reverse osmosis module is connected to the inlet end of the circulation pipeline 3.

[0024] By adopting the above technical solution, the gas in various parts of the pipeline system is discharged through multiple valves, thereby improving the reliability of the equipment system.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the TDS value measured by the salinity meter 1 is higher than the design requirement, the TDS value of the produced water exceeds the range, and the produced water does not meet the requirements. The produced water is returned to the inlet of the first-stage high-pressure pump from the outlet of the first-stage reverse osmosis module through the electric switch valve 2, and is pumped into the first-stage reverse osmosis module by the first-stage high-pressure pump for reuse, thereby reducing the total amount of salt in the water entering the first-stage reverse osmosis module and reducing the load of the first-stage reverse osmosis module, so that the system can output produced water that meets the requirements as soon as possible, and improve the stability and reliability of the system operation under the premise of energy saving; 2. The high-pressure water output from the concentrated water outlet of the first-stage reverse osmosis module is recovered through the energy recovery device, so that the seawater entering the system and filtered is pressurized, and the pressure energy is recycled to the maximum extent. The total amount of high-pressure seawater entering the first-stage reverse osmosis module is increased, and the amount of fresh water produced by the system is increased; 3. The water output from the concentrated water outlet can be recycled to the maximum extent, increasing the amount of fresh water produced by the system; 4. Real-time automatic control of the pressure of the primary and secondary reverse osmosis modules, so that the equipment system can maximize the water production while meeting the water quality requirements, and the water production efficiency is greatly improved; 5. The equipment system has a compact structure and can adapt to seawater of different salinities, realizing the needs of miniaturization and adaptive operation for ship use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a marine reverse osmosis seawater desalination equipment system in an embodiment of the present application.

[0027] Figure 2 It is a structural schematic diagram used to demonstrate the filter cleaning mode in the embodiment of the present application.

[0028] Figure 3 It is a structural schematic diagram used to demonstrate the energy recovery module in the embodiment of the present application.

[0029] Figure 4 It is a structural schematic diagram used to demonstrate the primary reverse osmosis membrane cleaning mode in the embodiment of the present application.

[0030] Description of the accompanying drawings: 1. Raw water pretreatment module; 11. Water inlet pipeline; 111. Fresh water inlet; 112. Seawater inlet; 12. Seawater pump; 13. Multi-way valve; 131. Filter pipeline 1; 132. Filter pipeline 2; 133. Filter pipeline 3; 14. Filter; 141. Exhaust valve 1; 15. Fine filter; 151. Exhaust valve 2; 16. Safety filter; 161. Exhaust valve 3; 2. Primary reverse osmosis module; 21. Primary reverse Osmotic membrane; 22, primary high-pressure pump; 3, secondary reverse osmosis module; 31, secondary reverse osmosis membrane; 32, secondary high-pressure pump; 33, discharge pipeline 2; 331, fresh water outlet B; 332, salinity meter 2; 333, electric switch valve 6; 4, energy recovery module; 41, energy recovery device; 42, pressure booster pump; 43, regulating valve 1; 5, final treatment module; 51, pH adjustment solution tank; 511, pH detector; 52, disinfection solution tank ; 53, metering pump 1; 54, metering pump 2; 61, circulation pipeline 1; 611, salinity meter 1; 612, electric switch valve 1; 613, fresh water outlet A; 614, manual switch valve; 62, circulation pipeline 2; 621, electric switch valve 2; 622, discharge pipeline 1; 6221, concentrated water main pipe; 62211, concentrated water outlet; 6222, electric switch valve 4; 63, circulation pipeline 3; 631, electric switch valve 3; 63 2. Control valve 2; 633. Pressure transmitter 1; 7. Cleaning box; 71. Cleaning pipeline 1; 711. Electric switch valve 5; 72. Cleaning pipeline 2; 721. Electric switch valve 7; 73. Drain valve; 74. Water supply pipeline; 741. Solenoid valve; 75. Discharge pipeline 3; 751. Pressure transmitter 2; 752. Control valve 3; 753. Flow meter; 754. Check valve; 76. Secondary concentrated water recovery pipeline; 761. Control valve 4. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The embodiment of the present application discloses a marine reverse osmosis seawater desalination equipment system.

[0033] Reference Figure 1 The marine reverse osmosis desalination equipment system includes a raw water pretreatment module 1, a primary reverse osmosis module 2, a secondary reverse osmosis module 3, an energy recovery module 4, and a final treatment module 5.

[0034] The raw water pretreatment module 1 is used for preliminary filtering of seawater. The raw water pretreatment module 1 includes an inlet pipeline 11, the inlet of the inlet pipeline 11 is divided into a fresh water inlet 111 and a seawater inlet 112, a seawater pump 12 is arranged at the seawater inlet 112, a multi-way valve 13 is arranged at the outlet of the inlet pipeline 11, and multiple interface ends of the multi-way valve 13 are respectively connected with a filter pipeline 1 131, a filter pipeline 2 132, and a filter pipeline 3 133, a filter 14 is arranged on the filter pipeline 1 131, and the seawater pump 12 pumps seawater into the inlet end of the filter 14 through the multi-way valve 13, and a fine filter 15 and a security filter 16 are arranged on the filter pipeline 2 132, and the seawater pump 12 pumps seawater into the inlet end of the fine filter 15 through the multi-way valve 13, and after the seawater passes through the filter 14, the fine filter 15, and the security filter 16, it is pressurized by the primary high-pressure pump 22 and enters the primary reverse osmosis module 2 to realize primary water production. The technical solution of connecting the seawater pump 12, the filter 14, the fine filter 15 and the safety filter 16 in series makes the structure compact and reasonable, and is more suitable for marine use.

[0035] Reference Figure 2 The multi-way valve 13 is a multi-way reversing valve. When the filter 14 needs to be cleaned, the multi-way valve 13 switches the flow direction of the filter line 1 131. After passing through the multi-way valve 13, the seawater enters the filter 14 from the outlet of the filter 14 and returns to the multi-way valve 13 from the inlet end of the filter 14, and then the seawater is discharged from the end of the multi-way valve 13 connected to the filter line 3 133.

[0036] When the filter 14 needs to be cleaned, the multi-way valve 13 switches the flow direction of the filter line 1 131, and the seawater is reversely injected from the original water outlet of the filter 14 through the seawater pump 12 to reversely flush the filter 14. The sewage formed after flushing returns to the multi-way valve 13 from the original water inlet end of the filter 14, and is then discharged from the end of the multi-way valve 13 connected to the filter line 3 133 to the concentrated water main pipe 6221 for discharge, thereby avoiding blockage of the filter 14, restoring the filtering capacity of the filter 14, and keeping the equipment system in an efficient working state for a long time.

[0037] The primary reverse osmosis module 2 includes a plurality of primary reverse osmosis membranes 21. In this embodiment, three primary reverse osmosis membranes 21 are provided, wherein two primary reverse osmosis membranes 21 are connected in parallel and connected in series with another primary reverse osmosis membrane 21. A primary high-pressure pump 22 is provided between the primary reverse osmosis module 2 and the raw water pretreatment module 1, and the primary high-pressure pump 22 is provided between the security filter 16 and the primary reverse osmosis module 2. The primary high-pressure pump 22 pumps the seawater 12 passing through the raw water pretreatment module 1 into the primary reverse osmosis module 2, thereby generating primary produced water and primary high-pressure concentrated water.

[0038] The secondary reverse osmosis module 3 includes a plurality of secondary reverse osmosis membranes 31, and the filtering capacity of the secondary reverse osmosis membranes 31 is greater than the filtering capacity of the primary reverse osmosis membrane 21. In this embodiment, two secondary reverse osmosis membranes 31 are provided and the two secondary reverse osmosis membranes 31 are provided in parallel. A secondary high-pressure pump 32 is provided between the secondary reverse osmosis module 3 and the primary reverse osmosis module 2, and the secondary high-pressure pump 32 pumps the seawater 12 passing through the primary reverse osmosis module 2 into the secondary reverse osmosis module 3, thereby generating secondary produced water and secondary concentrated water.

[0039] Reference Figure 3 The energy recovery module 4 is arranged behind the concentrated water outlet end of the first-stage reverse osmosis module 2, and the energy recovery module 4 includes an energy recovery device 41, a pressure boosting pump 42, and a regulating valve 632.

[0040] The concentrated water inlet of the energy recovery device 41 is connected to the concentrated water outlet of the primary reverse osmosis module 2. The regulating valve 2 632 is arranged at the concentrated water outlet of the energy recovery device 41. The primary concentrated water produced by the primary reverse osmosis module 2 is back-pressured and regulated by the regulating valve 2 632 at the concentrated water outlet of the energy recovery device 41, so that the primary reverse osmosis module 2 is within the normal working pressure range, forming primary high-pressure concentrated water.

[0041] The outlet end of the raw water pretreatment module 1 is connected to the inlet end of the primary reverse osmosis module 2, and to the outlet end of the pressure boosting pump 42. The inlet end of the pressure boosting pump 42 is connected to the raw water outlet end of the energy recovery device 41. The low-pressure raw water formed after treatment by the raw water pretreatment module 1 flows into the energy recovery device 41 from the raw water inlet end of the energy recovery device 41 through suction by the pressure boosting pump 42. The energy recovery device 41 recovers the pressure energy of the primary high-pressure concentrated water and pressurizes the low-pressure raw water entering the energy recovery device 41. The pressure boosting pump 42 further pressurizes the raw water pressurized by the energy recovery device 41 to form high-pressure raw water. The pressure boosting pump 42 pumps the high-pressure raw water into the primary reverse osmosis module 2, thereby increasing the total amount of seawater entering the primary reverse osmosis module 2 and realizing energy recovery.

[0042] A circulation pipeline 61 is arranged between the outlet end of the produced water of the primary reverse osmosis module 2 and the inlet end of the secondary reverse osmosis module 3. A salinometer 611 and an electric switch valve 612 are arranged on the circulation pipeline 61. A manual switch valve 614 is arranged in front of the electric switch valve 612. The salinometer 611 performs TDS detection on the primary produced water passing through the primary reverse osmosis module 2. The salinometer 611 is arranged at one end close to the primary reverse osmosis module 2, and the electric switch valve 612 is arranged at one end close to the secondary reverse osmosis module 3. A fresh water outlet A613 is arranged at one end of the circulation pipeline 61 away from the primary reverse osmosis module 2, and the manual switch valve 614 is connected to the fresh water outlet A613.

[0043] When the pressure in the circulation pipeline 1 61 is too high, part of the produced water can be discharged by increasing the opening of the electric switch valve 4 6222 to adjust the pressure in the pipeline, thereby automatically maintaining the normal operation of the equipment system.

[0044] A second flow pipeline 62 is provided between the outlet of the first-stage reverse osmosis module 2 and the inlet of the first-stage high-pressure pump 22 . A second electric switch valve 621 is provided on the second flow pipeline 62 . The second electric switch valve 621 is kept normally open.

[0045] When the TDS value measured by the salinometer 611 is lower than the design requirement value (TDS value < 500ppm), the TDS value is within the range, the primary water production meets the requirements, the electric switch valve 1 612 is opened, and the electric switch valve 2 621621 is closed. When it is necessary to continue the secondary water production, the primary water production enters the secondary reverse osmosis module 3 from the primary reverse osmosis module 2 through the secondary high-pressure pump 32. When only primary water production is needed, the primary high-pressure pump 22 and the energy recovery module 4 pump in raw water, and produce water through the primary reverse osmosis module 2. The manual switch valve 614 is opened and directly output from the fresh water outlet A613 for user use.

[0046] When the TDS value measured by the salt meter 611 is higher than the design requirement value (TDS value ≥ 500ppm), the TDS value of the primary produced water exceeds the range, and the primary produced water does not meet the requirements. The primary produced water returns from the outlet of the primary reverse osmosis module 2 through the electric switch valve 2 621 to the inlet of the primary high-pressure pump 22 and is pumped into the primary reverse osmosis module 2 by the primary high-pressure pump 22 for further processing. When the TDS value measured by the salt meter 611 drops to the design requirement value (TDS value < 500ppm), the electric switch valve 1 612 opens, and the electric switch valve 2 621 continues to remain open for 2s and then closes, so that the produced water that meets the specified requirements can be automatically and quickly output.

[0047] A circulation pipeline 3 63 is provided between the concentrated water inlet of the energy recovery device 41 and the concentrated water outlet of the primary reverse osmosis membrane 21 module. An electric switch valve 3 631 is provided on the circulation pipeline 3 63. The electric switch valve 3 631 is kept normally open.

[0048] The circulation pipeline 2 62 branches off from the discharge pipeline 1 622, and the discharge pipeline 1 622 is provided with a concentrated water main pipe 6221 at one end away from the circulation pipeline 2 62. The circulation pipeline 3 63 is connected to the concentrated water main pipe 6221, and the concentrated water main pipe 6221 is provided with a concentrated water outlet 62211 at one end away from the circulation pipeline 2 62. The filter pipeline 3 133 is connected to the concentrated water main pipe 6221 at one end away from the multi-way valve 13.

[0049] The concentrated water inlet of the energy recovery device 41 is provided with a pressure transmitter 1 633, and the concentrated water outlet of the energy recovery device 41 is provided with a regulating valve 2 632. The regulating valve 2 632 is used to adjust the seawater pressure of the primary reverse osmosis membrane 21 and the seawater flow and pressure of the energy recovery device 41. The regulating valve 2 632 is connected to the concentrated water main pipe 6221. The pressure transmitter 1 633 collects the pressure information of the energy recovery device 41 and adjusts the regulating valve 2 632 according to the requirements of the equipment control system, so that the pressure of the primary produced water inside the primary reverse osmosis module 2 and discharged by the primary reverse osmosis module 2 is in the range of 90% to 95% of the working pressure, and the primary reverse osmosis module 2 is adaptively pressure controlled. According to the detection data of the pressure transmitter 1 633, the opening of the regulating valve 2 632 is adjusted according to the requirements of the equipment system when the primary reverse osmosis module 2 is under the ideal working pressure, the water production is maximized and the water production is qualified. When the pressure in the circulation pipeline 3 63 is too high or the water produced by the first-stage reverse osmosis module 2 is unqualified, the opening of the regulating valve 2 632 is increased to adjust the pressure in the pipeline, automatically maintaining the equipment system running in a normal working state.

[0050] After the equipment system is powered on, the opening of the second regulating valve 632 is automatically in (or restored to) the position state when the equipment system was operating normally last time. When the TDS value measured by the salinometer 1 611 for 3 consecutive minutes is higher than the design requirement value (TDS value 450ppm), the opening of the second regulating valve 632 increases, and the pressure at the inlet of the energy recovery device 41 decreases until the TDS value of the water produced by the first reverse osmosis module 22 is lower than the design requirement value (TDS value 400ppm), and the second regulating valve 632 stops regulating.

[0051] The inlet end of the circulation pipeline 3 63 is connected to the highest point of the concentrated water outlet of the primary reverse osmosis module 2, and the gas inside the system is discharged through the regulating valve 1 43. When the equipment system starts working, the regulating valve 1 43 performs exhaust work. After the primary reverse osmosis module 2 produces water, the regulating valve 1 43 helps to adjust the pressure inside the primary reverse osmosis module 2 according to the detection result of the salinometer 1 611, so as to adjust the water output of the primary water produced by the primary reverse osmosis module 2, thereby dynamically controlling the TDS of the primary water produced.

[0052] The discharge pipeline 1 622 is provided with an electric switch valve 4 6222. When the pressure in the circulation pipeline 1 61 is too high or the primary produced water is unqualified, when the secondary high-pressure pump 32 is not working, the electric switch valve 4 6222 opens and discharges the primary produced water to the concentrated water main pipe 6221. When the pressure in the circulation pipeline 1 61 and the circulation pipeline 3 63 is too high, the electric switch valve 4 6222 opens and discharges part of the unqualified produced water to relieve the pressure in the pipeline, maintain the normal operation of the equipment system, and realize the automatic adjustment of the pressure by the equipment system.

[0053] A discharge pipeline 3 75 is provided between the concentrated water outlet end of the secondary reverse osmosis membrane 31 module and the concentrated water outlet end of the raw water pretreatment module 1. The discharge pipeline 3 75 is provided with a pressure transmitter 2 751, a regulating valve 3 752, a flow meter 753 and a check valve 754. The flow meter 753 adjusts the pressure in the discharge pipeline 3 75 through the regulating valve 3 752 according to the requirements of the system discharge flow, so that the secondary produced water with a low TDS value is discharged to the inlet end of the primary high-pressure pump 22, and the secondary produced water with a low TDS value is recycled through the primary reverse osmosis membrane 21 module. The check valve 754 is used to prevent the raw water in the pipe from flowing back.

[0054] A secondary concentrated water recovery pipeline 76 is arranged between the concentrated water inlet end of the discharge pipeline three 75 and the inlet end of the secondary high-pressure pump 32. A regulating valve four 761 is arranged on the secondary concentrated water recovery pipeline 76. The pressure transmitter two 751 collects the pressure information of the discharge pipeline three 75 and adjusts the regulating valve four 761 according to the requirements of the equipment control system, so that the pressure inside the secondary reverse osmosis module 3 and the pressure of the secondary produced water discharged from the secondary reverse osmosis module 3 are in the range of 90% to 95% of the working pressure.

[0055] When the pressure in the secondary reverse osmosis membrane 31 exceeds 95% of the working pressure, the opening of the regulating valve three 752 increases, and the secondary produced water with low TDS flows to the inlet end of the primary high-pressure pump 22 to adjust the equipment system pressure. When the salinity meter two 332 detects that the produced water of the secondary reverse osmosis membrane 31 module is beyond the required range, the opening of the regulating valve three 752 is reduced until the TDS value of the secondary produced water reaches the design lower limit control value (TDS value 80ppm); through the setting of the regulating valve four 761, the secondary concentrated water with low TDS value output by the secondary reverse osmosis membrane 31 module is recycled.

[0056] Through the above settings and joint control, the TDS values ​​of the primary and secondary produced water are controlled within the required limit range to maximize the water production.

[0057] The electric switch valve three 631 is a three-way switching valve, one end of the electric switch valve three 631 is connected to the concentrated water outlet end of the first-stage reverse osmosis module 2, the second end of the electric switch valve three 631 is connected to the concentrated water inlet end of the energy recovery device 41, and the third end of the electric switch valve three 631 is connected to the cleaning box 7, and the cleaning box 7 is provided with a cleaning liquid for cleaning the first-stage reverse osmosis membrane 21.

[0058] A cleaning pipeline 1 71 is provided between the outlet of the cleaning tank 7 and the inlet of the secondary high-pressure pump 32, a cleaning pipeline 2 72 is provided between the outlet of the secondary high-pressure pump 32 and the inlet of the primary osmosis module, an electric switch valve 5 711 is provided on the cleaning pipeline 1 71, and an electric switch valve 7 721 is provided at the raw water inlet end of the primary reverse osmosis module 2, and the electric switch valve 5 711 is kept normally closed. A drain valve 73 for draining residual liquid is provided at the bottom of the cleaning tank 7.

[0059] When the primary reverse osmosis membrane 21 needs to be chemically cleaned, the electric switch valve 5 711 and the electric switch valve 7 721 are switched from the disconnected state to the open state, and the electric switch valve 3 631 is switched from being connected to the concentrated water inlet end of the energy recovery device 41 to being connected to the cleaning tank 7, so that the concentrated water inlet end of the energy recovery device 41 is in a disconnected state. The secondary high-pressure pump 32 pumps the cleaning liquid in the cleaning tank 7 through the cleaning pipeline 2 72 to the primary reverse osmosis module 2, and the cleaning liquid passes through the primary reverse osmosis module 2 and then returns to the cleaning tank 7 through the electric switch valve 3 631, and finally the sewage is discharged through the sewage valve 73.

[0060] A water supply pipeline 74 is also branched from the circulation pipeline 62 2 . A solenoid valve 741 is provided on the water supply pipeline 74 . When the solenoid valve 741 is opened, the primary produced water of the primary reverse osmosis module 2 can be injected into the cleaning tank 7 .

[0061] Reference Figure 4 The primary reverse osmosis membrane 21 needs to be cleaned after being used for a period of time. When the primary reverse osmosis membrane 21 needs to be cleaned, the electric switch valve 5 711 is opened, and the secondary high-pressure pump 32 pumps the cleaning liquid in the cleaning tank 7 to the primary reverse osmosis module 2 through the cleaning pipeline 2 72. After passing through the primary reverse osmosis module 2, the cleaning liquid returns to the cleaning tank 7 through the electric switch valve 3 631, and finally the sewage is discharged through the sewage valve 73. When the primary reverse osmosis module 2 can output the produced water, the solenoid valve 741 can be opened to inject water into the cleaning tank 7 to prepare the cleaning liquid for chemical cleaning. The outlet end of the secondary reverse osmosis module 3 is provided with a discharge pipeline 2 33, and the end of the discharge pipeline 2 33 away from the secondary reverse osmosis module 3 is provided with a fresh water outlet B331.

[0062] A final treatment module 5 is arranged on the discharge pipeline 2 33, and the final treatment module 5 includes a pH adjusting solution tank and a disinfection solution tank 52. The pH adjusting solution tank is provided with a pharmaceutical solution for adjusting the pH value of the produced water, and the disinfection solution tank 52 is provided with a pharmaceutical solution for disinfection. Both the pH adjusting solution tank and the disinfection solution tank 52 are provided with a liquid replenishing valve for replenishing the pharmaceutical and a liquid draining valve for emptying the residual liquid.

[0063] A metering pump 1 53 is provided at one end of the pH adjustment solution tank near the fresh water outlet B331, and a metering pump 2 54 is provided at one end of the disinfection solution tank 52 near the fresh water outlet B331.

[0064] The second discharge pipeline 33 is provided with a pH detector 511 and a second salinity meter 332 . The pH detector 511 is arranged at one end of the disinfection solution tank 52 close to the second metering pump 54 . The second salinity meter 332 performs TDS detection on the produced water passing through the final treatment module 5 .

[0065] According to the result of the pH detector 511 detecting the water produced by the secondary reverse osmosis membrane 31, the pH solution tank automatically adjusts the appropriate flow rate of the pharmaceutical solution used to adjust the pH value of the produced water through the metering pump 1 53 and injects it into the discharge pipeline 2 33.

[0066] According to the result of the second salinity meter 332 detecting the water produced by the secondary reverse osmosis membrane 31 , the disinfection solution tank 52 automatically adjusts the appropriate flow rate of the disinfection agent solution through the second metering pump 54 and injects it into the second discharge pipeline 33 .

[0067] Based on the concentration of the pH regulator, the flow rate of metering pump 2 54 corresponding to the disinfectant solution and the flow rate of metering pump 1 53 corresponding to the pH regulator are automatically adjusted and set according to the detection value of the pH detector 511. After 5 minutes, the pH value of the produced water is detected in real time to correct the flow rates of metering pump 1 53 and metering pump 2 54 until the secondary produced water meets the requirements of the equipment system.

[0068] The pH of the produced water passing through the secondary reverse osmosis module 3 is adjusted and disinfected by the pH adjusting solution tank and the disinfection solution tank 52, so that the produced water becomes drinking water.

[0069] An electric switch valve 6 333 is provided between the salinometer 2 332 and the fresh water outlet B331. The electric switch valve 6 333 is a three-way switching valve. One end of the electric switch valve 6 333 is connected to the discharge pipeline 2 33, the second end of the electric switch valve 6 333 is connected to the fresh water outlet B331, and the third end of the electric switch valve 6 333 is connected to the concentrated water outlet 62211; After the produced water is PH adjusted and disinfected, when the PH value measured by the PH detector 511 and the TDS value measured by the salinity meter 2 332 reach the design requirements for drinking water (TDS value <100ppm), the produced water meets the requirements, the electric switch valve 6 333 opens and remains connected to the fresh water outlet B331, and the produced water is discharged from the secondary reverse osmosis module 3 through the secondary high-pressure pump 32 through the fresh water outlet B331 for use by users.

[0070] When the pH value measured by the pH detector 511 and the TDS value measured by the salt meter 2332 exceed the design requirements for drinking water (TDS value ≥ 100ppm), the produced water does not meet the requirements, the electric switch valve 6333 is connected to the concentrate outlet 62211, the produced water is discharged through the concentrate outlet 62211, and then the opening of the regulating valve 4 761 on the secondary concentrate recovery pipeline 76 is reduced. At the same time, by increasing the opening of the regulating valve 3 752 on the discharge pipeline 3 75, the secondary concentrate discharge volume is increased and the secondary concentrate pressure is reduced until the TDS value of the secondary produced water drops to the design lower limit control value (TDS value = 80ppm).

[0071] The filter 14 is provided with an exhaust valve 141, the fine filter 15 is provided with an exhaust valve 2 151, and the safety filter 16 is provided with an exhaust valve 3 161. Together with the regulating valve 43 provided on the circulation pipeline 3 63, the gas in various parts of the pipeline system is discharged through a plurality of valves, thereby improving the reliability of the equipment system.

[0072] The implementation principle of a marine reverse osmosis desalination equipment system in the embodiment of the present application is: The seawater pump 12 pumps the raw water through the multi-way valve 13 and passes through the filter 14, the fine filter 15, and the safety filter 16. The filtered clean raw water is injected into the primary reverse osmosis module 2 through the primary high-pressure pump 22 to obtain primary produced water; The salt meter 1 611 detects the primary produced water. When the measured TDS value of the primary produced water is higher than the design requirement value (TDS value ≥ 500ppm), the produced water does not meet the requirements. The produced water is returned from the outlet of the primary reverse osmosis module 2 to the inlet of the primary high-pressure pump 22 through the electric switch valve 2 621 and is pumped into the primary reverse osmosis module 2 by the primary high-pressure pump 22 for recycling and re-filtration. At the same time, by adjusting the concentrated water back pressure of the primary reverse osmosis module 2, the produced water of the primary reverse osmosis module 2 is adjusted to a state that meets the design requirements. When the TDS value of the primary produced water measured by the salinometer 611 drops to the design requirement value (TDS value < 500ppm), the produced water meets the requirements, the electric switch valve 612 opens, and the primary produced water (fresh water with a TDS value < 500ppm) is output from the fresh water outlet A613 through the manual switch valve 614.

[0073] When it is necessary to continue the secondary water production, the secondary high-pressure pump 32 pumps the primary water produced by the primary reverse osmosis module 2 into the secondary reverse osmosis module 3, and the secondary reverse osmosis module 3 outputs the secondary water produced; The salt meter 332 detects the secondary produced water. When the TDS value of the secondary produced water measured by the salt meter 332 is higher than the design requirement value (TDS value ≥ 100ppm), the produced water does not meet the requirements. By reducing the opening of the regulating valve 4 761 on the secondary concentrated water recovery pipeline 76, the total amount of recycled water flowing to the inlet of the secondary high-pressure pump 32 is reduced. At the same time, by increasing the opening of the regulating valve 3 752 on the discharge pipeline 3 75, the discharge volume of the secondary concentrated water is increased and the secondary concentrated water pressure is reduced.

[0074] When the TDS value of the secondary produced water measured by the salinometer 2 332 drops to the design lower limit control value (TDS value = 80ppm), the regulating valve 3 752 and the regulating valve 4 761 stop regulating.

[0075] After the produced water is PH adjusted and disinfected, when the TDS value measured by the salinometer 332 is lower than the design requirement of the drinking water index (TDS value <100ppm), and the PH value detected by the PH detector 511 is within the design requirement of the drinking water index (PH6.5~PH7.5), and the produced water meets the requirements, the electric switch valve 6 333 is restored to the state of being connected to the fresh water outlet B331, and the produced water of the secondary reverse osmosis module 3 is discharged to the user through the fresh water outlet B331.

[0076] When the pH value measured by the pH detector 511 exceeds the range of pH6.5 to pH7.5 and the TDS value measured by the salinity meter 2332 is ≥100ppm, the produced water does not meet the requirements. After 10 minutes, the electric switch valve 6333 at the outlet of the final treatment module 5 is switched to be connected to the concentrated water outlet 62211, and the produced water that does not meet the requirements is discharged.

[0077] When the produced water reaches or recovers to the design drinking water control index after disinfection, pH value and pressure regulation of the secondary reverse osmosis module 3, the electric switch valve 6333 is switched to close the concentrated water outlet 62211, and at the same time, it is connected to the fresh water outlet B331 and discharged through the fresh water outlet B331 for user use. The equipment system achieves the functional requirement of adaptively controlling the output of drinking water through the above automatic control adjustment. The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A marine reverse osmosis desalination equipment system, characterized in that: include: A raw water pretreatment module (1), wherein a seawater pump (12) is provided at the inlet end of the raw water pretreatment module (1), and the seawater pump (12) pumps raw water into the raw water pretreatment module (1) for preliminary filtration; A primary reverse osmosis module (2), the primary reverse osmosis module (2) comprising a plurality of primary reverse osmosis membranes (21); a primary high-pressure pump (22) is provided between the primary reverse osmosis module (2) and the raw water pretreatment module (1), the primary high-pressure pump (22) pumps raw water passing through the raw water pretreatment module (1) into the primary reverse osmosis module (2), thereby generating primary produced water and primary high-pressure concentrated water; A secondary reverse osmosis module (3), the secondary reverse osmosis module (3) comprising a plurality of secondary reverse osmosis membranes (31), the filtration capacity of the secondary reverse osmosis membranes (31) being greater than the filtration capacity of the primary reverse osmosis membrane (21); a secondary high-pressure pump (32) being arranged between the secondary reverse osmosis module (3) and the primary reverse osmosis module (2), the secondary high-pressure pump (32) pumping the primary high-pressure concentrated water passing through the primary reverse osmosis module (2) into the secondary reverse osmosis module (3), thereby generating secondary produced water and secondary concentrated water; An energy recovery module (4), the energy recovery module (4) being arranged behind the concentrated water outlet of the primary reverse osmosis module (2), the energy recovery module (4) comprising an energy recovery device (41), a pressure boosting pump (42), and a second regulating valve (632); The concentrated water inlet of the energy recovery device (41) is connected to the concentrated water outlet of the primary reverse osmosis module (2), the second regulating valve (632) is arranged at the concentrated water outlet of the energy recovery device (41), and the primary concentrated water produced by the primary reverse osmosis module (2) is back-pressured and regulated by the second regulating valve (632) at the concentrated water outlet of the energy recovery device (41) to form primary high-pressure concentrated water; After being processed by the raw water pretreatment module (1), low-pressure raw water is formed, and the low-pressure raw water enters the raw water inlet end of the energy recovery device (41) from the outlet end of the raw water pretreatment module (1); the raw water outlet end of the energy recovery device (41) is connected to the inlet end of the pressure boosting pump (42), and the outlet end of the pressure boosting pump (42) is connected to the outlet end of the first-stage high-pressure pump (22); The energy recovery device (41) recovers the pressure energy of the primary high-pressure concentrated water and pressurizes the low-pressure raw water entering the energy recovery device (41); the pressure boosting pump (42) further pressurizes the raw water pressurized by the energy recovery device (41) to form high-pressure raw water; and the pressure boosting pump (42) pumps the high-pressure raw water into the primary reverse osmosis module (2).

2. The marine reverse osmosis desalination equipment system according to claim 1, characterized in that: A circulation pipeline (61) is provided between the concentrated water outlet of the primary reverse osmosis module (2) and the concentrated water inlet of the secondary reverse osmosis module (3); a salinometer (611) and an electric switch valve (612) are provided on the circulation pipeline (61); a manual switch valve (614) is provided in front of the electric switch valve (612); the salinometer (611) performs TDS detection on the primary produced water passing through the primary reverse osmosis module (2); the salinometer (611) is provided at one end close to the primary reverse osmosis module (2); the electric switch valve (612) is provided at one end close to the secondary reverse osmosis module (3); a fresh water outlet A (613) is provided at one end of the circulation pipeline (61) away from the primary reverse osmosis module (2); and the manual switch valve (614) is connected to the fresh water outlet A (613); A second circulation pipeline (62) is provided between the outlet of the first-stage reverse osmosis module (2) and the inlet of the first-stage high-pressure pump (22), and a second electric switch valve (621) is provided on the second circulation pipeline (62), and the second electric switch valve (621) is kept normally open; When the TDS value measured by the salinity meter 1 (611) is lower than the design requirement, the primary water production meets the requirement, and the electric switch valve 1 (612) is opened. When the secondary water production is required, the primary water production enters the secondary reverse osmosis module (3) from the primary reverse osmosis module (2) through the secondary high-pressure pump (32). When only the primary water production is required, the primary water production is directly discharged from the concentrated water outlet of the primary reverse osmosis module (2) through the manual switch valve (614) from the fresh water outlet A (613) for use by users. When the TDS value measured by the first salinity meter (611) is higher than the design requirement value, the TDS value of the first-stage produced water exceeds the range, and the first-stage produced water does not meet the requirements. The first-stage produced water is returned from the outlet of the first-stage reverse osmosis module (2) through the second electric switch valve (621) to the inlet of the first-stage high-pressure pump (22) and is then pumped into the first-stage reverse osmosis module (2) by the first-stage high-pressure pump (22) for recovery; When the TDS value measured by the salinometer 1 (611) drops to the design requirement value, the electric switch valve 1 (612) opens, and the electric switch valve 2 (621) continues to remain open for 2 seconds before closing; A circulation pipeline three (63) is arranged between the concentrated water inlet end of the energy recovery device (41) and the concentrated water outlet end of the primary reverse osmosis membrane (21) module, and an electric switch valve three (631) is arranged on the circulation pipeline three (63), and the electric switch valve three (631) is kept normally open.

3. The marine reverse osmosis desalination equipment system according to claim 2, characterized in that: The circulation pipeline 2 (62) branches off from the discharge pipeline 1 (622), and a concentrated water main pipe (6221) is provided at one end of the discharge pipeline 1 (622) away from the circulation pipeline 2 (62). The circulation pipeline 3 (63) is connected to the concentrated water main pipe (6221), and a concentrated water outlet (62211) is provided at one end of the concentrated water main pipe (6221) away from the circulation pipeline 2 (62). The concentrated water inlet end of the energy recovery device (41) is provided with a first pressure transmitter (634), and the concentrated water outlet end of the energy recovery device (41) is provided with a second regulating valve (632), the second regulating valve (632) is connected to the concentrated water main pipe (6221), the first pressure transmitter (634) collects pressure information of the energy recovery device (41) and adjusts the second regulating valve (632) according to the requirements of the equipment control system, so that the pressure of the primary produced water inside the primary reverse osmosis module (2) and discharged from the primary reverse osmosis module (2) is in the range of 90% to 95% of the working pressure, and the primary reverse osmosis module (2) is adaptively pressure controlled; The inlet end of the circulation pipeline 3 (63) is connected to the highest point of the concentrated water outlet of the first-stage reverse osmosis module (2); When the equipment system starts to work, the regulating valve 1 (633) performs exhaust work; After the primary reverse osmosis module (2) produces water, the regulating valve 1 (633) adjusts the pressure inside the primary reverse osmosis module (2) according to the detection result of the salinity meter 1 (611) to adjust the water output of the primary produced water output by the primary reverse osmosis module (2), thereby dynamically controlling the TDS of the primary produced water; The discharge pipeline one (622) is provided with an electric switch valve four (6222). When the pressure in the flow pipeline one (61) is too high or the primary produced water is unqualified, and when the secondary high-pressure pump (32) is not working, the electric switch valve four (6222) opens and discharges the primary produced water to the concentrated water main pipe (6221); A discharge pipeline (75) is provided between the concentrated water outlet end of the secondary reverse osmosis membrane module (3) and the concentrated water outlet end of the raw water pretreatment module (1). The discharge pipeline (75) is provided with a pressure transmitter (751), a regulating valve (GV5) (752), a flow meter (753) and a check valve (754). The flow meter (753) adjusts the pressure in the discharge pipeline (75) through the regulating valve (GV5) (752) according to the system discharge flow requirement, so that the secondary produced water with a low TDS value is discharged to the inlet end of the primary high-pressure pump (22), and the secondary produced water with a low TDS value is recycled through the primary reverse osmosis membrane module (2); The one-way valve (754) is used to prevent the raw water in the pipe from flowing back; A secondary concentrated water recovery pipeline (76) is provided between the concentrated water inlet end of the discharge pipeline three (75) and the inlet end of the secondary high-pressure pump (32), and a regulating valve four (761) is provided on the secondary concentrated water recovery pipeline (76). The pressure transmitter two (751) collects pressure information of the discharge pipeline three (75) and adjusts the regulating valve four (761) according to the requirements of the equipment control system, so that the pressure inside the secondary reverse osmosis module (3) and the pressure of the secondary produced water discharged from the secondary reverse osmosis module (3) are in the range of 90% to 95% of the working pressure.

4. The marine reverse osmosis desalination equipment system according to claim 2, characterized in that: The electric switch valve three (631) is a three-way switching valve, one end of the electric switch valve three (631) is connected to the concentrated water outlet end of the primary reverse osmosis module (2), the second end of the electric switch valve three (631) is connected to the concentrated water inlet end of the energy recovery device (41), and the third end of the electric switch valve three (631) is connected to a cleaning box (7), and the cleaning box (7) is provided with a cleaning liquid for cleaning the primary reverse osmosis membrane (21); A cleaning pipeline 1 (71) is provided between the outlet of the cleaning tank (7) and the inlet of the secondary high-pressure pump (32), a cleaning pipeline 2 (72) is provided between the outlet of the secondary high-pressure pump (32) and the inlet of the primary osmosis module, an electric switch valve 5 (711) is provided on the cleaning pipeline 1 (71), the electric switch valve 5 (711) is kept normally closed, and when it is necessary to clean the primary reverse osmosis membrane (21), the electric switch valve 5 (711) is opened, an electric switch valve 7 (721) is provided at the raw water inlet end of the primary reverse osmosis module (2), and when it is necessary to clean the primary reverse osmosis membrane (21), the electric switch valve 7 (721) is switched from a disconnected state to an open state, and the electric switch valve 3 (631) is switched from being connected to the concentrated water inlet end of the energy recovery device (41) to being connected to the cleaning tank (7), so that the concentrated water inlet end of the energy recovery device (41) is in a disconnected state; The secondary high-pressure pump (32) pumps the cleaning liquid in the cleaning box (7) through the second cleaning pipeline (72) to the primary reverse osmosis module (2); the cleaning liquid passes through the primary reverse osmosis module (2) and then passes through the third electric switch valve (631) to return to the cleaning box (7); The bottom of the cleaning box (7) is provided with a drain valve (73) for draining residual liquid.

5. The marine reverse osmosis desalination equipment system according to claim 4, characterized in that: The second circulation pipeline (62) is also branched with a water replenishment pipeline (74), and the water replenishment pipeline (74) is provided with a solenoid valve (741). After the solenoid valve (741) is opened, the primary water produced by the primary reverse osmosis module (2) can be injected into the cleaning tank (7).

6. The marine reverse osmosis seawater desalination equipment system according to claim 3, characterized in that: The raw water pretreatment module (1) comprises a water inlet pipeline (11), the inlet of the water inlet pipeline (11) is divided into a fresh water inlet (111) and a seawater inlet (112), the seawater pump is arranged at the seawater inlet (112), a multi-way valve (13) is arranged at the outlet of the water inlet pipeline (11), a plurality of interface ends of the multi-way valve (13) are respectively connected to a filter pipeline 1 (131), a filter pipeline 2 (132), and a filter pipeline 3 (133), and a filter pipeline 1 (131) is arranged on the filter pipeline 1 (131). 4), the seawater pump (12) pumps seawater into the inlet end of the filter (14) through the multi-way valve (13), the second filter pipeline (132) is provided with a fine filter (15) and a safety filter (16), the seawater pump (12) pumps seawater into the inlet end of the fine filter (15) through the multi-way valve (13), the end of the filter pipeline (133) away from the multi-way valve (13) is connected to the concentrated water main pipe (6221), and the first-level high-pressure pump (22) is arranged between the safety filter (16) and the first-level reverse osmosis module (2).

7. The marine reverse osmosis desalination equipment system according to claim 6, characterized in that: The multi-way valve (13) is a multi-way reversing valve. When the filter (14) needs to be cleaned, the multi-way valve (13) switches the flow direction of the filter pipeline 1 (131). After passing through the multi-way valve (13), the seawater enters the filter (14) from the outlet of the filter (14) and returns to the multi-way valve (13) from the inlet end of the filter (14). The seawater is then discharged from one end of the multi-way valve (13) that is connected to the filter pipeline 3 (133).

8. The marine reverse osmosis desalination equipment system according to claim 1, characterized in that: The outlet end of the secondary reverse osmosis module (3) is provided with a second discharge pipeline (33), and the end of the second discharge pipeline (33) away from the secondary reverse osmosis module (3) is provided with a fresh water outlet B (331); The second discharge pipeline (33) is provided with a final treatment module (5), and the final treatment module (5) comprises a pH adjustment solution tank (51) and a disinfection solution tank (52), wherein the pH adjustment solution tank (51) is provided with a pharmaceutical solution for adjusting the pH value of the produced water, and the disinfection solution tank (52) is provided with a pharmaceutical solution for disinfection; The second discharge pipeline (33) is provided with a pH detector (511) and a second salinity meter (332), and the second salinity meter (332) performs TDS detection on the produced water passing through the final treatment module (5); According to the result of the pH detector (511) detecting the water produced by the secondary reverse osmosis membrane (3), the pH solution tank (51) automatically adjusts the flow rate of the pharmaceutical solution for adjusting the pH value of the produced water through the metering pump (53) to be appropriately adjusted and then injected into the discharge pipeline (33) (2); According to the result of the second salinity meter (332) detecting the water produced by the secondary reverse osmosis membrane (3), the disinfection solution tank (52) automatically adjusts the appropriate flow rate of the disinfection agent solution through the second metering pump (54) and injects it into the second discharge pipeline (33).

9. The marine reverse osmosis desalination equipment system according to claim 7, characterized in that: An electric switch valve 6 (333) is provided between the salt meter 2 (332) and the fresh water outlet B (331), and the electric switch valve 6 (333) is a three-way switching valve, one end of the electric switch valve 6 (333) is connected to the discharge pipeline 2 (33), the second end of the electric switch valve 6 (333) is connected to the fresh water outlet B (331), and the third end of the electric switch valve 6 (333) is connected to the concentrated water outlet (62211); After the produced water is PH value adjusted and disinfected, when the PH value measured by the PH detector (511) and the TDS value measured by the second salinity meter (332) reach the design drinking water index, the produced water meets the requirements, the electric switch valve six (333) is connected to the fresh water outlet B (331), and the produced water is discharged through the fresh water outlet B (331) for use by users; When the pH value measured by the pH detector (511) and the TDS value measured by the second salinity meter (332) exceed the design requirements for drinking water, the electric switch valve six (333) is connected to the concentrated water outlet (62211), and the produced water is discharged through the concentrated water outlet (62211).

10. The marine reverse osmosis desalination equipment system according to claim 6, characterized in that: The filter (14) is provided with an exhaust valve 1 (141), the fine filter (15) is provided with an exhaust valve 2 (151), the safety filter (16) is provided with an exhaust valve 3 (161), and the highest point of the concentrated water outlet of the first-stage reverse osmosis module (2) is connected to the inlet end of the circulation pipeline 3 (63).

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