A multi-functional complementary "double-effect" seawater desalination device

Abstract

The utility model relates to a kind of multi-energy complementary "double-effect" seawater desalination device, including power supercharging system, power supercharging system includes power collection module and hydraulic complementary module, the power collection module includes the wave energy collection device and wind energy collection device by the hydraulic complementary module be connected;Heat energy utilization system includes solar collector and electric heater, the electric heater is electrically connected with electric accumulator, the electric accumulator is connected with the wave energy collection device;Double-effect desalination system includes the reverse osmosis system and distillation system set gradually, the reverse osmosis system is inhaled seawater by power supercharging system and carries out pressure-reversal osmosis, the distillation system is provided with heat energy to seawater by heat energy utilization system and carries out distillation desalination, whole device operation does not need additional energy, can independently operate and the efficiency of preparation freshwater is high.

Description

Technical Field

[0001] This utility model relates to the field of seawater desalination technology, specifically to a multi-energy complementary "dual-effect" seawater desalination device. Background Technology

[0002] With the global population growing, the demand for freshwater is increasing. However, the available freshwater resources on Earth are limited, while seawater resources are extremely abundant. Therefore, the research and development of seawater desalination technology has become particularly important.

[0003] Seawater desalination, the process of producing fresh water by desalinating seawater, is a technology for increasing water resource utilization. It can increase the total amount of freshwater and is unaffected by time, space, or climate, ensuring a stable supply of drinking water for coastal residents and feedwater for industrial boilers. Existing seawater desalination methods include seawater freezing, electrodialysis, distillation, reverse osmosis, and ammonium carbonate ion exchange. Reverse osmosis and distillation are the mainstream methods in the market. However, traditional seawater desalination methods, such as multi-stage flash evaporation and multi-effect evaporation, consume large amounts of energy, resulting in high operating costs. Multi-stage flash evaporation has advantages such as mature technology, reliable operation, and high equipment output, but its energy consumption is relatively high. High-pressure feedwater systems using high-pressure pumps for reverse osmosis account for 1 / 2 to 1 / 3 of the cost of seawater and consume 35% of the system's operating power. Furthermore, existing seawater desalination technologies still have some technical limitations, requiring more efficient and stable desalination technologies. All these methods have certain shortcomings, necessitating further research and development of more efficient, energy-saving, and environmentally friendly seawater desalination technologies and equipment. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a multi-energy complementary "dual-effect" seawater desalination device. This device consists of three parts: a power boosting system, a dual-effect desalination system, and a thermal energy utilization system. The hydraulic oil pipelines of the wind energy collection device and the wave energy collection device in the power boosting system can be adjusted through a hydraulic complementary module to achieve complementary boosting, thereby saving energy. Seawater can be drawn in through the power boosting system and pressurized to the membrane desalination chamber for reverse osmosis treatment to obtain freshwater. The remaining seawater after reverse osmosis treatment is distilled through the thermal energy utilization system. In this way, the entire device does not require external energy during operation, can operate independently, and has a high efficiency in producing freshwater.

[0005] This utility model provides a multi-energy complementary "dual-effect" seawater desalination device to solve the above-mentioned technical problems, comprising: The power boosting system includes a power harvesting module and a hydraulic complementary module, wherein the power harvesting module includes a wave energy harvesting device and a wind energy harvesting device connected through the hydraulic complementary module; The thermal energy utilization system includes a solar collector and an electric heater, wherein the electric heater is electrically connected to a storage device, and the storage device is connected to the wave energy collection device; The dual-effect desalination system includes a reverse osmosis system and a distillation system arranged sequentially. The reverse osmosis system draws in seawater through a power boosting system and performs pressurized reverse osmosis. The distillation system uses a heat energy utilization system to provide heat energy for distilling and desalinating the seawater.

[0006] Furthermore, the wave energy harvesting device includes multiple floats and a bidirectional hydraulic chamber. The bidirectional hydraulic chamber has a first membrane on both sides and a first piston between two of the first membranes. The float arms of the floats are connected to the first pistons. Part of the bidirectional hydraulic chamber is connected to the reverse osmosis system at both ends, and part of the bidirectional hydraulic chamber is connected to a hydraulic motor at both ends. The hydraulic motor is connected to the energy storage device.

[0007] Furthermore, the float is hemispherical and has a surface with a textured surface.

[0008] Furthermore, the wind energy harvesting device includes multiple fans and a wind-powered hydraulic chamber. The input end of the fan is connected to a second piston located in the wind-powered hydraulic chamber. The wind-powered hydraulic chamber is provided with a second membrane. The side of the wind-powered hydraulic chamber away from the fan is connected to the reverse osmosis system.

[0009] Furthermore, the hydraulic complementary module includes a complementary pipeline and a pressure control valve. The two ends of the complementary pipeline are respectively connected to the two sides of the bidirectional hydraulic chamber of the wave energy harvesting device and the wind hydraulic chamber of the wind energy harvesting device. The pressure control valve is located on the complementary pipeline to control the flow direction of the hydraulic oil.

[0010] Furthermore, the reverse osmosis system includes a pretreatment chamber and a membrane desalination chamber connected to the front and rear sides of the power booster system via an inlet pipe. A one-way valve is provided on the inlet pipe. A filter element is provided in the pretreatment chamber. A reverse osmosis membrane is provided in the membrane desalination chamber. The two sides of the membrane desalination chamber are respectively connected to the distillation system and the freshwater storage tank.

[0011] Furthermore, the inlet pipeline is provided with a seawater pressurization chamber, and at least two sets of one-way valves are provided on both sides of the seawater pressurization chamber. The seawater pressurization chamber is connected to the wind power hydraulic chamber of the wind energy collection device and / or the bidirectional hydraulic chamber of the wave energy collection device.

[0012] Furthermore, the filter element is composed of a filter screen and / or an ultrafiltration membrane.

[0013] Furthermore, the distillation system includes multiple layers of concentric hemispherical evaporation membranes disposed on the evaporation platform, a water separator connected to the membrane desalination chamber of the reverse osmosis system, and freshwater collection tanks and concentrated seawater collection tanks disposed on the inner and outer sides of the evaporation membranes. The outlet of the water separator is located at the apex of each layer of the evaporation membranes. The solar collector is covered on the outer side of the evaporation membranes, and the electric heater is disposed on the inner side of the evaporation membranes.

[0014] Furthermore, the freshwater collection tank is connected to the freshwater storage tank, and the concentrated seawater collection tank is connected to the concentrated seawater collection tank.

[0015] The beneficial effects of this utility model are as follows: This device consists of three parts: a power boosting system, a dual-effect desalination system, and a thermal energy utilization system. The hydraulic oil pipelines of the wind energy collection device and the wave energy collection device in the power boosting system can be adjusted through a hydraulic complementary module to achieve complementary boosting. This allows seawater to be drawn into the desalination device and pressured for reverse osmosis desalination via hydraulic pressure. It also allows the wave energy collection device to generate electricity and provide energy for seawater distillation, thus saving energy. The thermal energy utilization system can fully utilize solar energy and generate electricity through the wave energy collection device, converting electrical energy into thermal energy. The two complement each other to improve the efficiency of seawater distillation, further saving existing resources. The dual-effect desalination system, through the series connection of reverse osmosis and distillation, can improve the efficiency of seawater desalination and fully utilize the energy collected by this device.

[0016] During operation, seawater is first pretreated in the pretreatment chamber by the negative pressure and one-way valve provided by the wind and / or wave energy collection devices before being drawn into the membrane desalination chamber. At this time, the wind and / or wave energy collection devices collect energy to drive the piston movement and generate hydraulic potential energy. The converted hydraulic pressure drives the membrane to apply pressure to the seawater. Under pressure, the seawater undergoes reverse osmosis in the membrane desalination chamber to obtain fresh water. The remaining high-concentration seawater after passing through the reverse osmosis membrane continues to enter the distillation system. In this process, the solar collector first preheats the seawater, and then the water distributor controls the seawater to be appropriately distributed on the evaporation surface of each evaporation membrane to form a seawater liquid film. At this time, the heat radiation generated by the electric heater can evaporate the seawater to form water vapor. The water vapor condenses into fresh water on the lower surface of the upper evaporation membrane. A water distribution tank is provided at the bottom of the evaporation membrane to separate the unevaporated concentrated seawater from the fresh water, which is then collected to obtain fresh water.

[0017] In summary, by using this utility model, seawater can be drawn in through a power boosting system and pressurized to perform reverse osmosis treatment on the seawater to obtain fresh water. The remaining seawater after reverse osmosis treatment is then distilled through a heat energy utilization system. In this way, the entire device does not require external energy during operation, can operate independently, and has a high efficiency in producing fresh water.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 for Figure 2 A magnified view of the details of A; Figure 4 for Figure 2 A magnified view of the details of B; Figure 5 This is a layout diagram of the hydraulic power system of this utility model; Figure 6 This invention relates to a wave energy power device.

[0020] In the attached diagram: 10-Float, 11-Float arm, 12-First piston, 13-Two-way hydraulic chamber, 14-First membrane, 20-Fan, 21-Wind-driven hydraulic chamber, 22-Second piston, 23-Second membrane, 30-Complementary pipeline, 31-Pressure control valve, 40-Inlet pipeline, 41-Pretreatment chamber, 42-Membrane desalination chamber, 43-One-way valve, 50-Seawater pressurization chamber, 60-Solar collector, 61-Electric heater, 70-Evaporation platform, 71-Evaporation membrane, 71a-First evaporation surface, 71b-Second condensation surface, 71c-Second evaporation surface, 71d-Third condensation surface, 72-Water distributor, 73-Freshwater collection tank, 74-Concentrated seawater collection tank, 80-Freshwater storage tank, 90-Concentrated seawater collection tank. Detailed Implementation

[0021] Referring to the accompanying drawings, the specific embodiments of this utility model will be described in detail.

[0022] Reference Figures 1 to 6 This utility model provides a multi-energy complementary "dual-effect" seawater desalination device, including a power boosting system, a thermal energy utilization system and a dual-effect desalination system.

[0023] The power boosting system includes a power harvesting module and a hydraulic complementary module. The power harvesting module includes a wave energy harvesting device and a wind energy harvesting device connected through the hydraulic complementary module. The hydraulic oil lines of the wind energy harvesting device and the wave energy harvesting device in the power boosting system can be adjusted by the hydraulic complementary module to perform complementary boosting. This allows seawater to be drawn into the desalination device and pressured for reverse osmosis desalination through hydraulic pressure. It also allows the wave energy harvesting device to generate electricity and provide energy for seawater distillation, thereby saving energy. In some embodiments, the wave energy harvesting device includes a plurality of floats 10 and a bidirectional hydraulic chamber 13. The bidirectional hydraulic chamber 13 has a first diaphragm 14 on both sides and a first piston 12 between two first diaphragms 14. The float arm 11 of the float 10 is operatively connected to the first piston 12. Further, the float arm 11 is movably connected to the float 10 to accommodate the multi-angle movement of the float 10. The other end of the float arm 11 can be hinged to the main frame of the device so that the float arm 11 can swing when the float 10 moves. The piston rod of the first piston 12 can be slidably engaged with the float arm 11. When the float arm 11 swings, one end of the piston rod of the first piston 12 slides on the float arm 11, driving the piston rod of the first piston 12 to reciprocate. That is, the float 10 moves up and down in the wave field under the action of wave load and its own gravity, which can drive the float arm 11 to swing, thereby driving the first piston 12 hinged on the float arm 11 to reciprocate in the bidirectional hydraulic chamber 13, discharging high-pressure hydraulic oil, converting mechanical energy into hydraulic energy, and the volume of the piston side in the bidirectional hydraulic chamber increases, the pressure decreases, and due to the action of the one-way valve, the external seawater will be drawn into this side of the bidirectional hydraulic chamber.

[0024] Part of the bidirectional hydraulic chamber 13 is connected to the reverse osmosis system at both ends, and part of the bidirectional hydraulic chamber 13 is connected to the hydraulic motor at both ends. The hydraulic motor is connected to the energy storage device. Further, there are eight floats 10, four for hydraulic reverse osmosis and four for hydraulic power generation. The diameter of the float cylinder is 1m, and the height of the float cylinder is 0.4m. When the first piston 12 in the bidirectional hydraulic chamber 13 connected to the reverse osmosis system reciprocates, the volume of the hydraulic chamber on one side expands, the pressure decreases, and a negative pressure is formed inside, drawing seawater in using the first membrane 14 on that side. Conversely, the volume of the hydraulic chamber on the other side decreases, the pressure increases, and the first membrane 14 on that side forces seawater into the membrane desalination chamber 42 of the reverse osmosis system, pressurizing the reverse osmosis system. During the movement of the first piston 12, the bidirectional hydraulic chamber 13 connected to the hydraulic motor converts hydraulic energy into mechanical energy for the hydraulic motor through a hydraulic merging system. The rotation of the hydraulic motor drives the permanent magnet synchronous AC generator, and the electricity output by the generator is used to stably charge the battery pack in the energy storage device through an AC power conversion system.

[0025] Based on the structural principles of seashell surfaces, the float 10 is further hemispherical with a surface featuring undulating flow-guiding textures. When waves impact the surface, this textured design, due to its anti-adhesion and drag-reducing properties, can dissipate the impact force, reducing wave resistance and thus improving the stability of the float 10 and extending the device's lifespan. Furthermore, the float 10 can be raised above the water surface via a cable. For example, one end of the cable is connected to the float 10, and the other end is connected to a retrieval wheel. A first rotary motor drives the retrieval wheel to rotate, raising or lowering the float 10.

[0026] In some embodiments, the wind energy harvesting device includes multiple fans 20 and a wind-hydraulic chamber 21. The input end of each fan 20 is operatively connected to a second piston 22 disposed within the wind-hydraulic chamber 21. A second membrane 23 is disposed within the wind-hydraulic chamber 21. The side of the wind-hydraulic chamber 21 away from the fans 20 is connected to the reverse osmosis system. The input end of each fan 20 is operatively connected to the second piston 22 within the wind-hydraulic chamber 21. The second piston 22 moves within the wind-hydraulic chamber 21, drawing seawater through the second membrane 23 and pressurizing it into the membrane desalination chamber 42 to provide pressure for reverse osmosis. The reciprocating motion of the second piston 22 completes the cyclical intake of seawater and its subsequent pressurization into the reverse osmosis system for desalination.

[0027] Furthermore, the blower 20 consists of blades, a rotating shaft, an adjusting mechanism, and baffles. During normal operation, the adjusting mechanism rotates the blower 20 blades to 90°. When wind passes through the impeller, the blower 20 blades are subjected to force and begin to rotate, driving the two pistons 22 connected to them to reciprocate. This drives the connected wind-hydraulic chamber 21 to discharge hydraulic oil, converting mechanical energy into hydraulic energy, which acts on the second membrane 14 to draw in seawater and force it into the membrane desalination chamber 42. In extreme weather conditions, the adjusting mechanism rotates the blower 20 blades to 0°, forming a closed cylinder, thus protecting the blower 20. For example, each blower blade is hinged on one side to the upper and lower baffles of the blower frame, and on the other side to a connecting rod. The other ends of multiple connecting rods are hinged to the central rotating shaft. The central rotating shaft rotates under the action of the second rotating motor, thereby driving multiple connecting rods to synchronously push multiple blades to rotate synchronously, achieving adjustment of the blower blade angle. It can be understood that during blower operation, the central rotating shaft and the blower's rotating shaft rotate synchronously, thus keeping the angle of each blower blade stable.

[0028] In some embodiments, the hydraulic complementary module includes a complementary pipeline 30 and a pressure control valve 31. The two ends of the complementary pipeline 30 are respectively connected to both sides of the bidirectional hydraulic chamber 13 of the wave energy harvesting device and the wind hydraulic chamber 21 of the wind energy harvesting device. The pressure control valve 31 is located on the complementary pipeline 30 to control the flow direction of the hydraulic oil. The wave energy harvesting device and the wind energy harvesting device can respectively discharge high-pressure hydraulic oil through the bidirectional hydraulic chamber 13 or the wind hydraulic chamber 21 to squeeze the first membrane 14 or the second membrane 23. In this case, in the wave energy harvesting device, one-way valves 43 are installed on the pipelines on both sides of the bidirectional hydraulic chamber 13. Due to the action of the two one-way valves 43, seawater will be forced into the reverse osmosis system without causing backflow. Similarly, in the wind energy harvesting device, one-way valves can also be installed on the pipelines on both sides of the wind hydraulic chamber to restrict the flow direction of seawater and ensure that seawater is forced into the reverse osmosis system without causing backflow.

[0029] By setting up the hydraulic complementary pipeline 30 and the pressure control valve 31, the hydraulic circuits of the wave energy harvesting device and the wind energy harvesting device can operate independently, or the hydraulic circuits of the two devices can be mixed for complementary pressurization.

[0030] When both wind and wave resources are strong, and the hydraulic power of both the wave energy collection device and the wind energy collection device is large, approaching or reaching the rated pressure, the pressure control valve 31 connecting the pipelines of the two hydraulic subsystems closes, and each hydraulic subsystem operates independently, squeezing the first membrane 14 or the second membrane 23 to pressurize the seawater.

[0031] When the wind speed is high and the waves are small, if the hydraulic system of the wind energy harvesting device has reached the rated pressure, the pressure control valve 31 will allow some hydraulic oil to enter the hydraulic system of the wave energy harvesting device through the complementary pipeline 30 from the hydraulic system of the wind energy harvesting device, so as to increase the oil circuit pressure of the hydraulic system of the wave energy harvesting device and improve the hydraulic efficiency of the wave energy harvesting device.

[0032] Conversely, if the waves are large and the wind speed is low, the pressure control valve 3131 will cause some hydraulic oil to flow from the hydraulic system of the wave energy harvesting device to the hydraulic system of the wind energy harvesting device, so as to increase the oil circuit pressure of the hydraulic system of the wind energy harvesting device and improve the hydraulic efficiency of the wind energy harvesting device.

[0033] When wind and wave resources are scarce, the system has a low flow rate and low oil pressure. The control system issues a corresponding command to the pressure control valve 31 so that the hydraulic oil of the wind energy harvesting device and the hydraulic oil of the wave energy harvesting device are combined into a subsystem after being regulated by the pressure control valve 31, driving a set of combined hydraulic systems.

[0034] In the above operating modes, during the process of the hydraulic system of the wind energy harvesting device injecting oil into the hydraulic system of the wave energy harvesting device, or vice versa, it is necessary to ensure that the oil pressure in the two pipelines before the hydraulic oil collection inlet is consistent. This can be achieved by adjusting the pressure using a pressure-measuring control valve 3131 on the connecting oil line, making it more compatible with the hydraulic system to be injected. The pressure-measuring control valve 31 can realize the opening or closing of the hydraulic circuit as needed, and can also control the direction, pressure, and flow of the system oil. The pressure-measuring control valve can be a combination of an electro-hydraulic proportional directional valve, a sensor, and a controller, all coordinated by a central controller. The electro-hydraulic proportional directional valve can be one of the following: Bosch Rexroth 4WRE series, 4WRA series; Parker Hannifin D1FW series; Eaton KBDG5V series; or HAWE PSL type proportional directional valve. The pressure sensor can be installed on the main pipeline of the air-cooled hydraulic subsystem and the wave energy hydraulic subsystem.

[0035] For example, when wind is strong and waves are weak: the controller detects that the pressure on the (wind turbine side) is close to the rated pressure, while the pressure on the (wave side) is lower. The controller sends a command to the electro-hydraulic proportional directional valve, causing it to operate in the "wind turbine side to wave side oil supply" position, and adjusts the valve opening according to the pressure difference in the pipelines of the two subsystems, thereby controlling the flow rate and gradually increasing the hydraulic pressure on the wave side. When waves are strong and wind is weak: the process is reversed. When resources are scarce: the controller commands the proportional valve to merge the two oil lines and allow them to flow together into the combined hydraulic system.

[0036] When extreme weather conditions such as strong winds and high waves occur, and the wind and waves exceed the power generation capacity, the float 10 can be lifted off the water surface by a cable, and the blades of the wind turbine 20 can rotate to 0°, thus enabling the equipment to protect itself.

[0037] Table 1: Wave Energy and Wind Power Hydraulic System Conversion Control (see Table 1) Figure 5 );

[0038] In some embodiments, the thermal energy utilization system includes a solar collector 60 and an electric heater 61. The electric heater 61 is electrically connected to a storage device, which is connected to the wave energy collection device. In this case, the solar collector 60 converts light energy into heat energy, making full use of solar energy to preheat seawater. The wave energy collection device generates electricity, and the electric heater 61 converts electrical energy into heat energy to provide heat for seawater distillation. The two complement each other to improve the efficiency of seawater distillation and further save existing resources.

[0039] Furthermore, the solar collector 60 is mounted on top of the evaporation membrane 71 of the distillation system. The pipes of the solar collector are distributed in a mesh pattern, covering the evaporation platform 70. The solar collector 60 contains phase change material to convert light energy into heat energy. This increases the irradiation area and improves the heat conversion efficiency.

[0040] The electric heater 61 is located in the innermost spherical center layer of the evaporation platform 70, and preferably, it is in the shape of a spiral tube. The electric heater 61 is powered by the energy storage tank and heats the initial concentrated seawater through heat conduction, heat radiation, and heat convection.

[0041] Furthermore, an electrical signal transmitter is installed to detect the desalination status and provide feedback signals. This transmitter can be a combination of a sensor and a transmitter (analyzer / controller). The sensor probe directly contacts the water flow to continuously detect changes in salinity after desalination. The sensor can be a CLM153 / CLM253 inductive conductivity sensor or a CPS11D electrode sensor. The transmitter processes the conductivity signal measured by the sensor, converting it into salinity or TDS values ​​and outputting a standard electrical signal. The transmitter can be a CPS471D or a Liquiline CM44x. The electrical signal transmitter is located inside the freshwater storage tank 80 and on the outlet pipe of the membrane desalination chamber, responsible for monitoring the freshwater collection and controlling the outflow of concentrated seawater from the first effect. The sensor can be directly installed on the water supply pipe through a threaded hole or as a bypass, allowing water to flow into a bypass flow pipe containing the sensor.

[0042] In some embodiments, the dual-effect desalination system includes a reverse osmosis system and a distillation system arranged sequentially. The reverse osmosis system draws in seawater through a power boosting system and performs pressurized reverse osmosis, while the distillation system uses a heat utilization system to provide heat energy for distillation and desalination of the seawater. In this case, treating seawater through both the reverse osmosis and distillation systems improves the efficiency of seawater desalination and fully utilizes the energy collected by the device, thus achieving energy conservation. Under normal operating conditions, most semi-permeable membranes have a lifespan of about 2-3 years. However, in actual use, the lifespan of semi-permeable membranes is affected by various factors, such as seawater quality, operating pressure, and temperature, which can further shorten the membrane's lifespan. As the concentration of seawater at the semi-permeable membrane increases, greater pressure is required to compress the seawater to ensure desalination efficiency, but this also increases the damage to the reverse osmosis membrane. Therefore, it is advisable to first use reverse osmosis to produce a higher concentration of seawater, and then distill this higher-concentration seawater to reduce the damage to the semi-permeable membrane caused by excessively high seawater concentration.

[0043] Furthermore, the reverse osmosis system includes a pretreatment chamber 41 and a membrane desalination chamber 42 connected to the front and rear sides of the power booster system via an inlet pipe 40. The membrane desalination chamber 42 is connected to the distillation system and the freshwater storage tank 80 on both sides, respectively. A one-way valve 43 is installed on the inlet pipe 40 to control the flow direction of seawater and prevent backflow. The pretreatment chamber 41 contains a filter element, which is composed of a filter screen, an ultrafiltration membrane, etc.

[0044] The desalination chamber 42 is equipped with a reverse osmosis membrane, such as the Dow SW30HERLE-400DOW seawater desalination membrane. Before being drawn into the desalination chamber 42, the seawater is filtered in the pretreatment chamber 41 to remove impurities, ensuring it meets the feed water quality requirements and preventing damage to the first membrane 14, the second membrane 23, and the reverse osmosis membrane. The reverse osmosis zone indirectly pressurizes the seawater via a hydraulic diaphragm, preventing corrosion of the hydraulic and power systems and improving sealing. After the filtered seawater enters the desalination chamber 42, one side of the reverse osmosis membrane is the seawater zone, pressurized by the power pressurization system for reverse osmosis desalination; the other side is the freshwater zone, connected to the freshwater storage tank 80 to collect the reverse osmosis freshwater. The desalinated seawater then flows through pipelines to the distillation system for further processing.

[0045] In some embodiments, the inlet pipe 40 is provided with a seawater pressurization chamber 50, and at least two sets of one-way valves 43 are provided on both sides of the seawater pressurization chamber 50. The seawater pressurization chamber 50 is connected to the wind power hydraulic chamber 21 of the wind energy harvesting device and / or the bidirectional hydraulic chamber 13 of the wave energy harvesting device. Specifically, the two ends of the two seawater pressurization chambers 50 and the bidirectional hydraulic chamber 13 are separated by a first membrane 14, and the wind power hydraulic chamber 21 is separated from the other seawater pressurization chamber 50 by a second membrane 23. When hydraulic energy pressurizes the first membrane 14 or the second membrane 23, it indirectly pressurizes the seawater. Specifically, when the piston moves away from the membrane, a negative pressure is formed between the piston and the membrane, drawing in seawater; when the piston moves towards the membrane, the piston squeezes the membrane, forcing seawater into the membrane desalination chamber 42, avoiding corrosion of the hydraulic system or power system by seawater and improving sealing performance.

[0046] In some embodiments, the distillation system includes multiple layers of concentric hemispherical evaporation membranes 71 disposed on an evaporation platform 70, a water separator 72 connected to the membrane desalination chamber 42 of the reverse osmosis system, and freshwater collection tanks 73 and concentrated seawater collection tanks 74 disposed on the inner and outer sides of the evaporation membranes 71. The evaporation platform 70 is spherical in shape, which can improve stability. In this embodiment, the evaporation membranes 71 are provided with three layers of evaporation membranes 71 arranged at intervals from the inside to the outside, wherein the outer side of the evaporation membranes 71 is the evaporation surface and the inner side is the condensation surface.

[0047] The outlet of the water distributor 72 is located at the top of each layer of the evaporation membrane 71. The solar collector 60 is covered on the outside of the evaporation membrane 71. At this time, the first-effect seawater after being treated by the membrane desalination chamber 42 enters the solar collector through the water supply pipe for preheating and then flows to the water distributor 72, and is evenly distributed on each layer of the evaporation membrane 71 through the water distributor 72.

[0048] The electric heater 61 is located inside the evaporation membrane 71 to provide heat energy for seawater evaporation.

[0049] Furthermore, the freshwater collection tank 73 and the concentrated seawater collection tank 74 are located at the bottom of both sides of the evaporation membrane 71 and separated by a baffle plate to prevent seawater from polluting the freshwater. The freshwater collection tank 73 and the seawater collection tank 74 can be set separately, and the specific structure is not limited.

[0050] Furthermore, the freshwater collection tank 73 is connected to the freshwater storage tank 80, and the concentrated seawater collection tank 74 is connected to the concentrated seawater collection tank 90.

[0051] At this point, the seawater, drawn in by negative pressure siphon, enters the seawater pressurization chamber 50 after passing through the pretreatment chamber 41. The pressurized seawater then enters the membrane desalination chamber 42, where it undergoes initial desalination. The desalinated water is discharged into the freshwater storage tank 80. The remaining slightly concentrated seawater enters the intermediate storage chamber. A water pump discharges the first-effect slightly concentrated seawater into the solar collector inlet pipe. Due to heat conduction and convection heat transfer, the seawater is preheated and enters the distributor 72 pipe from its apex, reaching the apex of each evaporation membrane 71. It then flows through the outlet of the distributor 72 to the evaporation membranes. The slightly concentrated seawater is slowly discharged from the apex of the evaporation membrane 71, forming a seawater liquid film on the evaporation surface of each evaporation membrane 71. Heat energy is provided by the electric heater 61 to evaporate the seawater. The distributor 72 can control the flow rate; for example, a flow meter can be installed on the distributor. The flow rate control of the liquid can be achieved using existing methods, which will not be elaborated upon here. The absorbent material that can be applied to the evaporation surface facilitates the formation of a liquid film on the surface of each layer of hemispherical absorbent material when seawater flows towards the evaporation surface.

[0052] When in use, seawater is preheated as it passes through the pipes of the solar collector, and then enters each layer of the evaporation membrane starting from the powder water.

[0053] Taking a three-layer evaporation film as an example, the outer side of the first evaporation film is the first evaporation surface 71a, the outer side of the second evaporation film is the second evaporation surface 71c, the inner side is the second condensation surface 71b, and the inner side of the third evaporation film is the third condensation surface 71d.

[0054] The heat emitted by the electric heater 61 in the central layer is conducted to the seawater film on the first evaporation surface 71a. The seawater film evaporates to generate water vapor. Due to the temperature and concentration difference between the first evaporation surface 71a and the second condensation surface 71b, the water vapor on the first evaporation surface 71a will transfer mass to the second condensation surface 71b, where the water vapor density is lower. Because the temperature of the second condensation surface 71b is lower, the water vapor will condense on the inner surface of the second condensation surface 71b to generate fresh water, releasing latent heat of condensation, thereby heating the seawater film on the surface of the second evaporation surface 71c. The water vapor generated by the heated seawater film on the second evaporation surface 71c evaporates and condenses on the third condensation surface 71d, exactly the same as the gas-water binary mixture generation process in the first effect. The latent heat of condensation released on the third condensation surface is dissipated from the lower side of the solar collector gas in the form of thermal radiation and convective heat transfer.

[0055] Under the influence of gravity, the fresh water generated in each effect flows down the condensation surface to the fresh water collection tank 73 at the bottom of the evaporation platform 70, and then flows into the fresh water storage tank 80 through the fresh water pipeline. Meanwhile, the concentrated seawater that has not yet evaporated flows down the evaporation surface to the concentrated seawater tank, and is discharged into the concentrated seawater collection tank 90 through the pipeline.

[0056] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-energy complementary "dual-effect" seawater desalination device, characterized in that, include: The power boosting system includes a power harvesting module and a hydraulic complementary module, wherein the power harvesting module includes a wave energy harvesting device and a wind energy harvesting device connected through the hydraulic complementary module; The thermal energy utilization system includes a solar collector (60) and an electric heater (61), the electric heater (61) being electrically connected to a storage device, the storage device being connected to the wave energy collection device; The dual-effect desalination system includes a reverse osmosis system and a distillation system arranged sequentially. The reverse osmosis system draws in seawater through a power boosting system and performs pressurized reverse osmosis. The distillation system uses a heat energy utilization system to provide heat energy for distilling and desalinating the seawater.

2. The multi-energy complementary "dual-effect" seawater desalination device according to claim 1, characterized in that, The wave energy harvesting device includes multiple floats (10) and a bidirectional hydraulic chamber (13). The bidirectional hydraulic chamber (13) has a first membrane (14) on both sides and a first piston (12) between two first membranes (14). The float arm (11) of the float (10) is connected to the first piston (12) in a driving connection. Part of the bidirectional hydraulic chamber (13) is connected to the reverse osmosis system at both ends, and part of the bidirectional hydraulic chamber (13) is connected to a hydraulic motor at both ends. The hydraulic motor is connected to the energy storage device.

3. The multi-energy complementary "dual-effect" seawater desalination device according to claim 2, characterized in that, The float (10) is hemispherical and has a surface with a flow-guiding texture arranged in concave and convex patterns.

4. The multi-energy complementary "dual-effect" seawater desalination device according to claim 1, characterized in that, The wind energy harvesting device includes multiple fans (20) and a wind hydraulic chamber (21). The input end of the fan (20) is connected to a second piston (22) located in the wind hydraulic chamber (21). A second membrane (23) is provided in the wind hydraulic chamber (21). The side of the wind hydraulic chamber (21) away from the fan (20) is connected to the reverse osmosis system.

5. The multi-energy complementary "dual-effect" seawater desalination device according to claim 1, characterized in that, The hydraulic complementary module includes a complementary pipeline (30) and a pressure control valve (31). The two ends of the complementary pipeline (30) are connected to the two sides of the bidirectional hydraulic chamber (13) of the wave energy collection device and the wind hydraulic chamber (21) of the wind energy collection device, respectively. The pressure control valve (31) is installed on the complementary pipeline (30) to control the flow direction of the hydraulic oil.

6. The multi-energy complementary "dual-effect" seawater desalination device according to claim 1, characterized in that, The reverse osmosis system includes a pretreatment chamber (41) and a membrane desalination chamber (42) connected to the front and rear sides of the power booster system via an inlet pipe (40). A one-way valve (43) is provided on the inlet pipe (40). A filter element is provided in the pretreatment chamber (41). A reverse osmosis membrane is provided in the membrane desalination chamber (42). The two sides of the membrane desalination chamber (42) are connected to the distillation system and the freshwater storage tank (80), respectively.

7. The multi-energy complementary "dual-effect" seawater desalination device according to claim 6, characterized in that, The inlet pipeline (40) is equipped with a seawater pressurization chamber (50), and at least two sets of one-way valves (43) are provided on both sides of the seawater pressurization chamber (50). The seawater pressurization chamber (50) is connected to the wind power hydraulic chamber (21) of the wind energy harvesting device and / or the bidirectional hydraulic chamber (13) of the wave energy harvesting device.

8. The multi-energy complementary "dual-effect" seawater desalination device according to claim 6, characterized in that, The filter element is composed of a filter screen and / or an ultrafiltration membrane.

9. The multi-energy complementary "dual-effect" seawater desalination device according to claim 1, characterized in that, The distillation system includes multiple layers of concentric hemispherical evaporation membranes (71) on an evaporation platform (70), a water separator (72) connected to the membrane desalination chamber (42) of the reverse osmosis system, and freshwater collection tanks (73) and concentrated seawater collection tanks (74) located on the inner and outer sides of the evaporation membranes (71). The outlet of the water separator (72) is located at the apex of each layer of the evaporation membranes (71). The solar collector (60) is covered on the outside of the evaporation membranes (71), and the electric heater (61) is located on the inside of the evaporation membranes (71).

10. The multi-energy complementary "dual-effect" seawater desalination device according to claim 9, characterized in that, The freshwater collection tank (73) is connected to the freshwater storage tank (80), and the concentrated seawater collection tank (74) is connected to the concentrated seawater collection tank (90).

Images