CN110204009B - Wave energy and solar seawater desalination and salt production device - Google Patents
Wave energy and solar seawater desalination and salt production device Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
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- Y02A20/131—Reverse-osmosis
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract
The invention discloses a device for sea water desalination and salt production by wave energy and solar energy, which comprises an energy capture device, an energy storage and pressure stabilization device, a reverse osmosis device and a complementary energy recovery device which are sequentially connected through pipelines; the energy storage and voltage stabilization device comprises M-level energy storage and voltage stabilization pipelines which are sequentially arranged side by side, the inlet ends of two adjacent levels of energy storage and voltage stabilization pipelines are connected through connecting pipes, and each connecting pipe forms N-level connecting pipes; a sequence valve is arranged on each stage of connecting pipe, the outlet ends of the M-stage energy storage pressure stabilizing pipelines are converged on a pressure stabilizing water outlet main pipe, and seawater with stable pressure is input into the reverse osmosis device through the pressure stabilizing water outlet main pipe; an energy accumulator and a pressure reducing valve are arranged on each level of energy storage and pressure stabilization pipeline; the set output pressure of M pressure reducing valves of the M-level energy storage pressure stabilizing pipeline is sequentially increased. Compared with the prior art, the invention has the following advantages: the effects of stable water yield and energy conservation are realized.
Description
Technical Field
The invention relates to the field of seawater desalination, in particular to a device for seawater desalination and salt production by using wave energy and solar energy.
Background
The shortage of fresh water resources in the world becomes a problem of increasing concern. According to the latest statistics, over 20 hundred million of population fresh water resources are insufficient all over the world. By 2025, over 40 billion of people will be short of fresh water, which is a problem affecting billions of people today. Meanwhile, the continuous improvement of industrialization and urbanization construction, coastal land resources are increasingly tense, the problems of low land area utilization rate, large influence of climate influence factors and low benefit output value of the traditional sea salt industry are increasingly obvious, the salt field area is continuously reduced in the future, and the technical innovation of the sea salt industry is imperative. The main defects of the existing seawater desalination and salt production technologies are as follows: the energy consumption is high, the discharge of polluted high-concentration brine has negative influence on aquatic organisms, the use of fossil fuel has pollution to the environment, and when the fossil fuel is used for driving the hydraulic pump to pressurize seawater, the heat energy of the fossil fuel needs to be converted into electric energy firstly, then the electric energy is used for driving the hydraulic pump to be converted into hydraulic energy, and the energy conversion times are multiple. The wave energy and the solar energy are the same as other new energy sources, belong to renewable resources, are inexhaustible, and particularly have the characteristic of high energy density; in addition, the wave energy and the seawater used as the desalination raw material come from the ocean and can be obtained from local resources, so that the transportation cost and the cost investment of power generation equipment are reduced, the occupied area is small, and the land cost is saved; however, the wave energy also has the defects of large pulsation and instability, and the solar energy also has the defect of large influence by weather. Therefore, the wave energy and solar energy overcoming the defects of the wave energy and the solar energy has important significance for sea water desalination and salt production on the aspects of global fresh water supply and energy conservation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device for sea water desalination and salt production by using wave energy and solar energy, so as to realize the purposes of stable water yield and energy conservation.
The invention is realized by the following technical scheme:
a device for sea water desalination and salt production by wave energy and solar energy comprises an energy capture device, a reverse osmosis device, an energy storage and pressure stabilization device and a residual energy recovery device, wherein the energy capture device, the energy storage and pressure stabilization device, the reverse osmosis device and the residual energy recovery device are sequentially connected through pipelines; the energy capture device is used for converting seawater into high-pressure seawater and inputting the high-pressure seawater into a pressure-stabilizing water inlet main pipe of the energy storage and pressure stabilization device, the energy storage and pressure stabilization device converts the high-pressure seawater with large energy fluctuation into seawater with stable pressure and inputs the seawater into the reverse osmosis device, the reverse osmosis device carries out seawater desalination treatment again, fresh water and high-pressure strong brine are output after the treatment, and the high-pressure strong brine enters the complementary energy recovery device for complementary energy recovery and utilization;
the energy storage and pressure stabilization device comprises M-level energy storage and pressure stabilization pipelines which are sequentially arranged side by side, the inlet end of the first-level energy storage and pressure stabilization pipeline is connected with the pressure stabilization water inlet header pipe, the inlet ends of two adjacent-level energy storage and pressure stabilization pipelines are connected through connecting pipes, and each connecting pipe forms N-level connecting pipes, wherein N is M-1; a sequence valve is arranged on each stage of connecting pipe, the outlet ends of the M-stage energy storage pressure stabilizing pipelines are converged on a pressure stabilizing water outlet main pipe, and seawater with stable pressure is input into the reverse osmosis device through the pressure stabilizing water outlet main pipe; the energy storage and pressure stabilization pipelines at all levels are provided with energy accumulators and pressure reducing valves, and the energy accumulators are positioned on one side of the inlet ends of the corresponding pressure reducing valves; the set output pressure of M pressure reducing valves of the M-level energy storage and pressure stabilization pipeline is sequentially increased, the set pressure of M energy accumulators of the M-level energy storage and pressure stabilization pipeline is sequentially increased, and the set pressure of the energy accumulators on the same-level energy storage and pressure stabilization pipeline is greater than the set output pressure of the pressure reducing valves; the set opening pressure of N sequence valves on the N-stage connecting pipe is increased in sequence, and the set opening pressure of each sequence valve is larger than the set output pressure of a reducing valve connected with the outlet end of the sequence valve.
Furthermore, the complementary energy recovery device comprises a complementary energy power generation device and a complementary energy supercharging device, high-pressure strong brine from the reverse osmosis device enters a recovery water inlet pipe of the complementary energy recovery device, the tail end of the recovery water inlet pipe is connected with an inlet end of a first reversing valve, two outlet ends of the first reversing valve are respectively connected with the complementary energy power generation device and the complementary energy supercharging device, the complementary energy power generation device drives a generator to generate electricity by using high-pressure strong brine, the complementary energy supercharging device supercharges seawater by using the high-pressure strong brine, and the supercharged high-pressure seawater is converged into a pressure-stabilizing water inlet main pipe of the energy-storing and pressure-stabilizing device again through a recovery water outlet pipe; the pressure stabilizing water inlet main pipe of the energy and pressure stabilizing device is provided with a pressure sensor, the reversing of the first reversing valve is controlled by the pressure value collected by the pressure sensor, and when the pressure value of the pressure sensor is greater than the set output pressure of the pressure reducing valve on the last stage of energy and pressure stabilizing pipeline, the first reversing valve is connected with the waste energy power generation device; when the pressure value of the pressure sensor is not more than the set output pressure of the pressure reducing valve on the last stage of energy storage pressure stabilizing pipeline, the first reversing valve is connected with the residual energy supercharging device.
Further, high pressure strong brine is discharged to a strong brine collection box through the low pressure strong brine that exhaust behind the complementary energy recovery unit utilization, and is right through the evaporation crystallization device low pressure strong brine in the strong brine collection box carries out the evaporation crystallization salt manufacturing.
Furthermore, the complementary energy supercharging device comprises a double-acting supercharger, the double-acting supercharger comprises two large piston cavities positioned in the middle and two small piston cavities positioned at two ends, the two large piston cavities are respectively connected with respective supercharging water inlet branch pipes, one outlet of the first reversing valve is connected with a supercharging water inlet main pipe, and the supercharging water inlet main pipe is connected with the two supercharging water inlet branch pipes through a second reversing valve; the two small piston cavities are respectively connected with respective pressurizing water outlet branch pipes, the tail ends of the two pressurizing water outlet branch pipes are converged on the recovery water outlet pipe, the two small piston cavities are also respectively connected with a seawater inlet pipe, and the seawater inlet pipe respectively provides seawater for the two small piston cavities; the high-pressure strong brine is injected into any large piston cavity to push the piston in the double-acting supercharger to move, so that seawater in the small piston cavity is pressurized and then flows into a pressure stabilizing water inlet main pipe of the energy storage and pressure stabilizing device.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a wave energy and solar seawater desalination and salt production device, and the energy capture device can adopt various structural forms, such as raft type, float type, pendulum type and the like.
2. According to the hydraulic system, seawater is directly used for replacing hydraulic oil, wave energy is converted into hydraulic energy to pressurize the seawater, then high-pressure seawater enters the energy storage and pressure stabilization device and then enters the reverse osmosis device for desalination, and pollution caused by the fact that the conventional fossil energy is used for driving the hydraulic pump to pressurize the seawater is avoided; the wave energy is directly converted into hydraulic energy to pressurize the seawater, so that the energy conversion times are reduced, and the energy utilization rate is improved; in addition, the wave energy is low in cost compared with expensive fossil fuel.
3. The energy storage and pressure stabilization device greatly reduces the pressure pulsation caused by wave energy, improves the stability of water yield, reduces the fatigue damage to a reverse osmosis device, and improves the water yield quality; the pressure reducing valve on the energy storage pressure stabilizing pipeline regulates the pulsating pressure into stable output pressure; the set output pressure of the pressure reducing valves on the M-level energy storage and pressure stabilization pipelines is sequentially increased, so that the energy loss caused by pressure stabilization of the pressure reducing valves is reduced; the energy accumulator is used for reducing or eliminating flow pulsation of the energy capture device, hydraulic impact caused by opening and closing of the reversing of the third reversing valve and the sequence valve and the pressure reducing valve is stored when the pressure is increased, and the pressure difference is discharged and compensated when the pressure is reduced, so that the effect of peak clipping and valley filling is achieved; the preset pressure of the energy accumulators on the M-level energy storage and pressure stabilization pipeline is sequentially increased, so that the energy loss caused by pressure stabilization can be reduced; wherein the progression M of energy storage steady voltage pipeline can be adjusted according to concrete sea state, and the progression M is more, and the scope that can regulate and control operating pressure is big more, can be applicable to different sea area conditions, and device strong adaptability.
4. According to the complementary energy recovery device, the energy re-extraction is carried out on the high-pressure strong brine flowing out of the reverse osmosis device through the complementary energy supercharging device, so that not only is the energy waste caused by directly discharging the high-pressure strong brine avoided, but also the quality reduction of the fresh water caused by directly returning the strong brine to the reverse osmosis device for seawater desalination is avoided.
5. According to the complementary energy recovery device, the energy of the high-pressure strong brine flowing out of the reverse osmosis device is re-extracted through the complementary energy power generation device, so that energy waste caused by continuous pressurization of seawater by the complementary energy pressurization device when the M-level energy storage and pressure stabilization pipeline works is avoided, the generator is driven by the high-pressure strong brine to generate power, electric energy can be provided for the evaporation crystallization device, and self-energy supply is realized.
6. The energy capture device can collect solar energy and convert the solar energy into heat energy to evaporate and crystallize the strong brine discharged by the complementary energy recovery device to prepare salt, thereby avoiding pollution caused by using fossil energy.
7. The evaporation crystallization device of the invention not only avoids the pollution to the environment caused by the direct discharge of the strong brine, but also utilizes the strong brine to produce salt and dilute, and reduces the discharge of the brine concentration.
8. The complementary energy power generation device adopting the complementary energy recovery device provides electric energy for the evaporative crystallization device, reduces the influence of the solar energy on the weather, and still has energy for the evaporative crystallization device to work in cloudy days or at night.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
FIG. 3 is a graph of the relationship between water yield and time under the condition of no energy storage voltage stabilizing device simulated under Amesim software.
FIG. 4 is a graph of the relationship between water yield and time under the condition of an energy storage and voltage stabilization device obtained by simulation under Amesim software.
Reference numbers in the figures:
1, an energy capture device, 11 hydraulic cylinders, 12 floats, 13 solar panels, 14 first water inlet pipes, 15 second water inlet pipes, 16 pretreatment devices, 17 first water outlet pipes, 18 second water outlet pipes, 19 supercharging water outlet manifolds, 110 third reversing valves, 111 first nodes, 112 second nodes, 113 first water inlet one-way valves, 114 second water inlet one-way valves, 115 first water outlet one-way valves and 116 second water outlet one-way valves;
2 energy storage and pressure stabilization device, 21 first stage energy storage and pressure stabilization pipeline, 22 second stage energy storage and pressure stabilization pipeline, 23 third stage energy storage and pressure stabilization pipeline, 24 first stage connecting pipe, 25 second stage connecting pipe, 26 first stage pressure reducing valve, 27 second stage pressure reducing valve, 28 third stage pressure reducing valve, 29 first stage sequence valve, 210 second stage sequence valve, 211 first stage energy accumulator, 212 second stage energy accumulator, 213 third stage energy accumulator, 214 pressure stabilization water inlet manifold, 215 pressure stabilization water outlet manifold, 216 pressure stabilization overflow valve, 217 pressure sensor,
3, a reverse osmosis device, 31, a reverse osmosis membrane assembly, 32 a recovery water inlet pipe, 33 a fresh water outlet pipe and 34 a fresh water collecting box;
4 surplus energy recovery devices, 41 a first reversing valve, 42 a generator, 43 a second reversing valve, 44 a concentrated brine recovery tank, 45 a double-acting supercharger, 46 a large piston left cavity, 47 a large piston right cavity, 48 a small piston left cavity, 49 a small piston right cavity, 410 a supercharging water inlet manifold, 411 a supercharging water inlet branch pipe, 412 a supercharging water outlet branch pipe, 413 a recovery water outlet pipe, 414 a seawater inlet pipe, 415 surplus energy recovery energy accumulators and 416 surplus energy recovery overflow valves;
5 evaporative crystallization device.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Referring to fig. 1 to 4, the embodiment discloses a device for sea water desalination and salt production by wave energy and solar energy, which comprises an energy capture device 1, an energy storage and voltage stabilization device 2, a reverse osmosis device 3 and a residual energy recovery device 4, wherein the energy capture device 1, the energy storage and voltage stabilization device 2, the reverse osmosis device 3 and the residual energy recovery device 4 are sequentially connected through pipelines; the energy capture device 1 is used for converting seawater into high-pressure seawater and inputting the high-pressure seawater into a pressure-stabilizing water inlet header pipe 214 of the energy storage and pressure stabilization device 2, the energy storage and pressure stabilization device 2 converts the high-pressure seawater with large energy fluctuation into seawater with stable pressure and inputs the seawater into the reverse osmosis device 3, the reverse osmosis device 3 carries out seawater desalination treatment again, fresh water and high-pressure strong brine are output after the treatment, and the high-pressure strong brine enters the complementary energy recovery device 4 to carry out complementary energy recycling. The device directly replaces hydraulic oil with seawater, converts wave energy into hydraulic energy to pressurize the seawater, and then the high-pressure seawater enters the energy storage pressure stabilizing device 2 to stabilize the pressure and then enters the reverse osmosis device 3 to desalt the seawater, thereby not only avoiding the pollution caused by seawater pressurization by using fossil energy or hydraulic oil, but also reducing the energy conversion times, and having high energy utilization rate and low cost.
The energy capture device 1 comprises a hydraulic cylinder 11, a floater 12 is arranged at the top end of a piston rod of the hydraulic cylinder 11, the floater 12 floats on the surface of sea water, a solar panel 13 is arranged at the top end of the floater 12, an inner cavity of the hydraulic cylinder 11 is divided into a rod cavity and a rodless cavity by a piston, the rod cavity is communicated with the sea water of the sea through a first water inlet pipe 14, the rodless cavity is communicated with the sea water of the sea through a second water inlet pipe 15, a pretreatment device 16 is arranged at a position close to an inlet end of the first water inlet pipe 14 and a position close to the inlet end of the second water inlet pipe 15, silt in the sea water is pre-filtered through the pretreatment device 16, the middle section of the first water inlet pipe 14 is connected with the inlet end of a first water outlet pipe 17, the middle section of the second water inlet pipe 15 is connected with the inlet end of a second water outlet pipe 18, the outlet end of the first water outlet pipe 17 and the outlet end of the second water outlet pipe 18 are converged to the inlet end of a pressurizing water outlet main pipe 19, and the outlet end of the pressurizing water outlet main pipe 19 is connected with the inlet end of a third reversing valve 110, the outlet end of the third directional control valve 110 is connected to a pressure-stabilizing water inlet manifold 214 of the energy-storing and pressure-stabilizing device 2. The connection node of the first water outlet pipe 17 and the first water inlet pipe 14 is a first node 111, the connection node of the second water outlet pipe 18 and the second water inlet pipe 15 is a second node 112, a first water inlet check valve 113 is arranged between the inlet end of the first water inlet pipe 14 and the first node 111, a second water inlet check valve 114 is arranged between the inlet end of the second water inlet pipe 15 and the second node 112, a first water outlet check valve 115 is arranged on the first water outlet pipe 17, and a second water outlet check valve 116 is arranged on the second water outlet pipe 18. When the seawater desalination device works, the floater 12 floats up and down along with seawater waves to drive the piston rod of the hydraulic cylinder 11 to move up and down, the kinetic energy and the potential energy of the waves are converted into hydraulic energy to pressurize the seawater in the hydraulic cylinder 11, and the pressurized seawater is discharged into the energy storage and pressure stabilization device 2.
The energy storage and pressure stabilization device 2 comprises M-level energy storage and pressure stabilization pipelines which are sequentially arranged side by side, the inlet end of the first-level energy storage and pressure stabilization pipeline 21 is connected with a pressure stabilization water inlet header pipe 214, the inlet ends of two adjacent-level energy storage and pressure stabilization pipelines are connected through connecting pipes, and each connecting pipe forms N-level connecting pipes, wherein N is M-1; a sequence valve is arranged on each stage of connecting pipe, the outlet ends of the M-stage energy storage pressure stabilizing pipelines are converged on a pressure stabilizing water outlet main pipe 215, and the seawater with stable pressure is input into the reverse osmosis device 3 through the pressure stabilizing water outlet main pipe 215; the energy storage and pressure stabilization pipelines at all levels are provided with energy accumulators and pressure reducing valves, and the energy accumulators are positioned on one side of the inlet ends of the corresponding pressure reducing valves; the set output pressure of M pressure reducing valves of the M-level energy storage and pressure stabilization pipeline is sequentially increased, the set pressure of M energy accumulators of the M-level energy storage and pressure stabilization pipeline is sequentially increased, and the set pressure of the energy accumulators on the same-level energy storage and pressure stabilization pipeline is greater than the set output pressure of the pressure reducing valves; the set opening pressure of the N sequence valves on the N-stage connecting pipe is increased in sequence, and the set opening pressure of each sequence valve is larger than the set output pressure of the pressure reducing valve connected with the outlet end of the sequence valve. The energy storage and pressure stabilization device 2 greatly reduces pressure pulsation caused by wave energy, improves the stability of water yield, reduces fatigue damage to the reverse osmosis device 3, and improves the water yield quality; the pressure reducing valve on the energy storage pressure stabilizing pipeline regulates the pulsating pressure into stable output pressure; the set output pressure of the pressure reducing valves on the M-level energy storage and pressure stabilization pipelines is sequentially increased, so that the energy loss caused by pressure stabilization of the pressure reducing valves at all levels is reduced; the energy accumulators at all levels are used for reducing or eliminating flow pulsation of the energy capturing device, the third reversing valve 110 reverses and opens and closes hydraulic impact caused by the sequence valves and the pressure reducing valves at all levels, redundant seawater is stored when the pressure is increased, the pressure difference is discharged and compensated when the pressure is reduced, and the effect of 'peak clipping and valley filling' is achieved; the preset pressure of the energy accumulators on the M-level energy storage and pressure stabilization pipeline is sequentially increased, so that the energy loss caused by pressure stabilization can be reduced; wherein the progression M of energy storage steady voltage pipeline can be adjusted according to concrete sea state, and the progression M is more, and the scope that can regulate and control operating pressure is big more, can be applicable to different sea area conditions, and device strong adaptability.
The complementary energy recovery device 4 comprises a complementary energy power generation device and a complementary energy supercharging device, high-pressure concentrated brine from the reverse osmosis device 3 enters a recovery water inlet pipe 32 of the complementary energy recovery device 4, the tail end of the recovery water inlet pipe 32 is connected with the inlet end of a first reversing valve 41, two outlet ends of the first reversing valve 41 are respectively connected with the complementary energy power generation device and the complementary energy supercharging device, the complementary energy power generation device drives a generator 42 to generate electricity by using the high-pressure concentrated brine, the complementary energy supercharging device boosts the seawater by using the high-pressure concentrated brine, and the boosted high-pressure seawater is converged into a pressure-stabilizing water inlet header pipe 214 of the energy-storing and pressure-stabilizing device 2 again through a recovery water outlet pipe 413; a pressure sensor 217 is arranged on a pressure stabilizing water inlet manifold 214 of the energy storage and pressure stabilization device 2, the reversing of the first reversing valve 41 is controlled through the magnitude of a pressure value acquired by the pressure sensor 217, and when the pressure value of the pressure sensor 217 is larger than the set output pressure of a pressure reducing valve on the last stage of energy storage and pressure stabilization pipeline, the first reversing valve 41 is communicated with the surplus energy power generation device; when the pressure value of the pressure sensor 217 is not greater than the set output pressure of the pressure reducing valve on the last stage of energy storage pressure stabilizing pipeline, the first reversing valve 41 is communicated with the residual energy supercharging device. The complementary energy recovery device 4 has two working modes of complementary energy pressurization and complementary energy power generation, the complementary energy pressurization device performs energy re-extraction on high-pressure strong brine flowing out of the reverse osmosis device 3, and the high-pressure strong brine is utilized to pressurize seawater and then is output into the pressure-stabilizing water inlet header pipe 214 of the energy-storing and pressure-stabilizing device 2 through a pipeline, so that not only is energy waste caused by direct discharge of the high-pressure strong brine avoided, but also the situation that the quality of the fresh water is reduced because the high-pressure strong brine directly returns to the reverse osmosis device 3 to desalt the seawater is avoided; the complementary energy power generation facility carries out the energy to the high-pressure strong brine that flows out reverse osmosis unit 3 and draws again, generate electricity, both avoided when the M level energy storage steady voltage pipeline of energy storage voltage regulator device 2 has worked, complementary energy supercharging device continues the pressure boost sea water and exports and cause too much loss of pressure in the steady voltage inlet manifold 214 of energy storage voltage regulator device 2, utilized high-pressure strong brine again to drive generator 42 and generate electricity, provide the electric energy for evaporation crystallization device 5, realize the self-power supply.
The residual energy recovery device 4 further comprises a residual energy recovery energy accumulator 415 and a residual energy recovery overflow valve 416 which are arranged on the recovery water inlet pipe 32, when the first reversing valve 41 and the second reversing valve 43 are reversed, the recovery water inlet pipe 32 is disconnected with the residual energy recovery device 4 within a short time, seawater is temporarily stored in the residual energy recovery energy accumulator 415 on the recovery water inlet pipe 32, and hydraulic impact is reduced. If the pressure is too high, the residual energy recovery overflow valve 416 on the recovery water inlet pipe 32 is opened as a safety valve to release the pressure, so that the device is protected.
High-pressure strong brine discharges to a strong brine collection box 44 through the low pressure strong brine that exhaust after complementary energy recovery unit 4 utilized, carries out the evaporation crystallization salt manufacturing through evaporation crystallization device 5 to the low pressure strong brine in strong brine collection box 44. The evaporation crystallization device 5 avoids the pollution of the direct discharge of strong brine to the environment, utilizes the strong brine to produce salt and dilute, and discharges the salt after reducing the concentration of the salt. The energy source of the evaporative crystallization device 5 has two paths: one path of the power is from a generator 42 of the complementary energy power generation device, and the generator 42 supplies electric energy to the evaporative crystallization device 5 for evaporative crystallization to prepare salt; the other path is from a solar panel 13, and solar energy is converted into heat energy through the solar panel 13 to be used for the evaporative crystallization device 5 to carry out evaporative crystallization to prepare salt.
Carry out evaporative crystallization to high concentration salt water through evaporative crystallization device 5 and realize salt, system fresh water, can reduce the harm of the emission of high concentration salt water to the environment, improved the utilization efficiency of sea water, and the required energy of evaporative crystallization device 5 is provided by energy capture device 1 and complementary energy power generation facility of device itself, realizes self-power supply. The residual energy power generation device utilizing the residual energy recovery device 4 reduces the influence of the solar energy on the climate, and the energy still exists in cloudy days or at night for the evaporation crystallization device 5 to work.
The complementary energy supercharging device comprises a double-acting supercharger 45, the double-acting supercharger 45 comprises two large piston cavities in the middle and two small piston cavities at two ends, the two large piston cavities are a large piston left cavity 46 and a large piston right cavity 47 respectively, and the two small piston cavities comprise a small piston left cavity 48 and a small piston right cavity 49. The two large piston cavities are respectively connected with respective pressurizing water inlet branch pipes 411, one outlet of the first reversing valve 41 is connected with the pressurizing water inlet manifold 410, and the pressurizing water inlet manifold 410 is connected with the two pressurizing water inlet branch pipes 411 through the second reversing valve 43; the two small piston cavities are respectively connected with respective pressurizing water outlet branch pipes 412, the tail ends of the two pressurizing water outlet branch pipes 412 are converged on a recovery water outlet pipe 413, the two small piston cavities are also respectively connected with a seawater inlet pipe 414, and the seawater inlet pipe 414 respectively provides seawater for the two small piston cavities; the high-pressure concentrated brine is injected into any large piston cavity to push the piston in the double-acting supercharger 45 to move, so that seawater in the small piston cavity is pressurized and then flows into the pressure-stabilizing water inlet header pipe 214 of the energy-storing and pressure-stabilizing device 2. The invention adopts the double-acting supercharger 45, thereby avoiding the quality reduction of the fresh water product caused by the direct return of the strong brine to the reverse osmosis device 3.
The working process or working principle of the device is as follows:
the energy capture device 1 is arranged in the offshore area, the floater 12 of the energy capture device 1 floats on the sea surface, the side with the solar panel 13 faces upwards, the lower part of the floater 12 is connected with the piston rod of the hydraulic cylinder 11, and the bottom of the hydraulic cylinder 11 is fixed on the seabed to ensure that the energy capture device 1 cannot be washed away by sea waves.
The invention establishes a bracket on the seabed near an energy capture device 1, the bracket extends out of the seawater level, and an energy storage pressure stabilizer 2, a reverse osmosis device 3, a residual energy recovery device 4 and an evaporative crystallization device 5 are all arranged on the bracket and are positioned above the seawater level.
When the energy storage and pressure stabilization device works normally, the left position of the third reversing valve 110 is controlled to be connected with the pressure stabilization water inlet main pipe 214, and high-pressure seawater flows into the energy storage and pressure stabilization device 2 from the energy capture device 1; when the work is stopped and the maintenance is carried out, the drain pipe is connected to the right position of the third reversing valve 110, and the seawater in the hydraulic cylinder 11 is directly drained back to the sea.
When the floater 12 of the energy capture device 1 moves upwards along with waves to drive the piston to move upwards, the rod cavity of the hydraulic cylinder 11 is a high-pressure cavity, high-pressure seawater in the rod cavity flows into the inlet end of the third reversing valve 110 through the first water outlet pipe 17, then is input into the pressure-stabilizing water inlet main pipe 214 of the energy-storage pressure stabilizing device 2 from the left outlet end of the third reversing valve 110, and flows back into seawater through the pressure-stabilizing overflow valve 216 arranged on the pressure-stabilizing water inlet main pipe 214 when the seawater pressure is overlarge; meanwhile, the rodless cavity of the hydraulic cylinder 11 is a low-pressure cavity, seawater enters the rodless cavity of the hydraulic cylinder 11 through the second water inlet pipe 15, and silt in the seawater is pre-filtered through the pre-treatment device 16 before entering the rodless cavity of the hydraulic cylinder 11.
When the floater 12 of the energy capture device 1 moves downwards along with waves, the piston rod is driven to move downwards, at the moment, the rodless cavity of the hydraulic cylinder 11 is a high-pressure cavity, high-pressure seawater in the rodless cavity flows into the inlet end of the third reversing valve 110 through the second water outlet pipe 18, then flows into the pressure-stabilizing water inlet main pipe 214 of the energy storage and pressure stabilization device 2 from the left outlet end of the third reversing valve 110, and when the seawater pressure is overlarge, flows back into the seawater through a pressure-stabilizing overflow valve 216 arranged on the pressure-stabilizing water inlet main pipe 214; meanwhile, the rod cavity of the hydraulic cylinder 11 is a low-pressure cavity, seawater enters the rod cavity of the hydraulic cylinder 11 through the first water inlet pipe 14, and silt in the seawater is pre-filtered through the pre-treatment device 16 before entering the rod cavity of the hydraulic cylinder 11.
The seawater entering the hydraulic cylinder 11 first reacts with the ferric chloride solution in the pretreatment device 16, calcium ions, magnesium ions and other ions in the seawater are firstly chemically precipitated, most of silt, large-particle precipitates and colloid in the seawater are filtered by the pretreatment device 16, the filtered seawater is pressurized into high-pressure seawater by the energy capture device 1, then enters the energy storage and pressure stabilization device 2 through a pipeline to stabilize the pressure of the high-pressure seawater in the pipeline, and then enters the reverse osmosis device 3 for seawater desalination.
The energy storage and pressure stabilization device 2 in this embodiment is described by taking three-stage energy storage and pressure stabilization pipelines, namely a first-stage energy storage and pressure stabilization pipeline 21, a second-stage energy storage and pressure stabilization pipeline 22 and a third-stage energy storage and pressure stabilization pipeline 23, and two-stage connecting pipes, namely a first-stage connecting pipe 24 and a second-stage connecting pipe 25, as examples.
When the pressure of the pressure-stabilizing water inlet manifold 214 of the energy-storing and pressure-stabilizing device 2 is lower than the set opening pressure of the first-stage sequence valve 29, the first-stage sequence valve 29 is closed, seawater flows into the first-stage pressure-stabilizing valve 26 through the first-stage energy-storing and pressure-stabilizing pipeline 21 and is stabilized to the set output pressure, then flows into the reverse osmosis device 3, the redundant seawater flow of the system after the pressure stabilization of the first-stage pressure-stabilizing valve 26 is stored in the first-stage energy accumulator 211, and the discharged seawater compensates for the reduced pressure difference when the pressure is reduced;
when the pressure of the pressure-stabilizing water inlet manifold 214 of the energy-storing and pressure-stabilizing device 2 is higher than the set opening pressure of the first-stage sequence valve 29 and lower than the set opening pressure of the second-stage sequence valve 210, the first-stage sequence valve 29 is opened, the second-stage sequence valve 210 is closed, seawater flows into the second-stage energy-storing and pressure-stabilizing pipeline 22 through the first-stage connecting pipe 24, then flows into the second-stage pressure-reducing valve 27 to be stabilized to the set output pressure, then flows into the reverse osmosis device 3, the redundant seawater flow of the system after the pressure of the second-stage pressure-reducing valve 27 is stabilized is stored in the first-stage energy accumulator 211 and the second-stage energy accumulator 212, and the seawater is discharged to make up the reduced pressure difference when the pressure is reduced.
When the pressure of the pressure-stabilizing water inlet manifold 214 of the energy-storing and pressure-stabilizing device 2 is higher than the set opening pressure of the second-stage sequence valve 210, the first-stage sequence valve 29 is kept open, the second-stage sequence valve 210 is opened, seawater flows into the third-stage energy-storing and pressure-stabilizing pipeline 23 through the second-stage connecting pipe 25, then flows into the third-stage pressure-reducing valve 28 to be stabilized to the set output pressure, and then flows into the reverse osmosis device 3, the redundant seawater flow of the system after the third-stage pressure-reducing valve 28 is stabilized is stored in the first-stage energy accumulator 211, the second-stage energy accumulator 212 and the third-stage energy accumulator 213, and the seawater is discharged to make up the reduced pressure difference when the pressure is reduced. The set output pressure of each pressure reducing valve and the set opening pressure of each sequence valve are determined by the local specific sea condition and water yield requirement, the stage number of the energy storage and pressure stabilization pipeline and the stage number of the connecting pipe can be increased to further improve the working pressure regulation and control range of the energy storage and pressure stabilization device 2, and the water production stability and the energy utilization rate are improved. If the pressure is too high, the pressure stabilizing overflow valve 216 is opened as a safety valve to release the pressure, so that the device is protected.
The high-pressure seawater flowing out of the energy storage and pressure stabilization device 2 flows into the inlet of the reverse osmosis component for seawater desalination, the fresh water flowing out of the fresh water outlet end of the reverse osmosis device 3 enters the fresh water collecting box 34, and the high-pressure strong brine flowing out of the strong brine outlet end of the reverse osmosis device 3 flows into the recovery water inlet pipe 32. Because the high-pressure seawater flowing out of the energy storage pressure stabilizing device 2 is the pressure stabilizing seawater, the pressure difference at two sides of the reverse osmosis membrane is stable, the produced water is stable, the fatigue damage to the reverse osmosis membrane is small, and the produced water quality is high.
When the pressure sensor 217 detects that the seawater pressure of the pressure-stabilizing water inlet manifold 214 of the energy-storing and pressure-stabilizing device 2 is not greater than the set output pressure of the pressure-reducing valve on the last stage of energy-storing and pressure-stabilizing pipeline, the pressure sensor 217 transmits a signal to the controller, the controller controls the first reversing valve 41 to be connected with the residual energy supercharging device, namely, the right position of the first reversing valve 41 is controlled to be connected with the supercharging water inlet manifold 410, the high-pressure strong brine flowing out of the reverse osmosis device 3 flows into the inlet end of the first reversing valve 41 through the recovery water inlet pipe 32, then flows into the supercharging water inlet manifold 410 through the right position outlet end of the first reversing valve 41, then flows into the inlet end of the second reversing valve 43, the second reversing valve 43 is firstly connected into one supercharging water outlet branch pipe 412, the high-pressure strong brine flows into the supercharging water inlet branch pipe 411 connected with the right piston cavity 47 through the left position outlet end of the second reversing valve 43, then flows into a large piston right cavity 47 of the double-acting supercharger 45, the volume of the large piston right cavity 47 is increased, the piston is pushed to move left, the small piston left cavity 48 is pressurized, at the moment, the small piston left cavity 48 is a high-pressure cavity, the small piston right cavity 49 is a low-pressure cavity, the volume of the small piston left cavity 48 is reduced, seawater in the small piston left cavity 48 flows into a pressurized water outlet branch pipe 412 after being pressurized by the piston, and then flows back into a pressure stabilizing water inlet main pipe 214 of the energy and pressure storage device 2 through a recovery water outlet pipe 413; meanwhile, the volume of the small piston right cavity 49 is increased, and the seawater flows into the seawater inlet pipe 414 and flows into the small piston right cavity 49; the volume of the left chamber 46 of the large piston is reduced, and the low-pressure strong brine in the chamber flows into the inlet end of the second reversing valve 43 through the pressurized water inlet branch pipe 411 and then is discharged into the strong brine recovery tank 44 from the outlet end of the second reversing valve 43.
When the piston of the double-acting pressure booster 45 touches the position sensor in the small piston left chamber 48 of the double-acting pressure booster 45, the position sensor sends a signal to the controller, and the controller connects the right position of the second directional valve 43 to the pipeline. The high-pressure strong brine flowing out of the right outlet end of the first reversing valve 41 firstly flows into the pressure-increasing water inlet header pipe 410 and then flows into the right inlet end of the second reversing valve 43, the high-pressure strong brine flowing out of the right outlet end of the second reversing valve 43 flows into the pressure-increasing water inlet branch pipe 411 connected with the large piston left cavity 46 and then flows into the large piston left cavity 46 of the double-acting pressure booster 45, the volume of the large piston left cavity 46 is increased, the piston is pushed to move to the right, the small piston right cavity 49 is a high-pressure cavity, the volume of the small piston right cavity 49 is reduced, seawater in the small piston right cavity 49 flows into the pressure-increasing water outlet branch pipe 412 after being boosted, and then flows back into the pressure-stabilizing water inlet header pipe 214 of the energy-storing and pressure stabilizing device 2 through the recovery water outlet pipe 413; the small piston left cavity 48 is a low-pressure cavity, the volume in the cavity is increased, and seawater flows into the seawater inlet pipe 414 and flows into the small piston left cavity 48; at the same time, the volume of the large piston right chamber 47 of the double-acting supercharger 45 is reduced, and the low-pressure concentrated brine in the large piston right chamber 47 flows into the second reversing valve 43 through the supercharging water inlet branch pipe 411 and then is discharged into the concentrated brine recovery tank 44 from the second reversing valve 43.
When the piston touches the position sensor in the right cavity 49 of the small piston, the position sensor transmits a signal to the controller, and the controller connects the left position of the second reversing valve 43 into the pipeline, and the cycle is continued.
When the pressure sensor 217 detects that the pressure of the high-pressure seawater in the pressure stabilizing water inlet manifold 214 of the energy storage and pressure stabilization device 2 is greater than the set output pressure of the pressure reducing valve on the last stage of energy storage and pressure stabilizing pipeline, the pressure reducing valve on the last stage of energy storage and pressure stabilization pipeline of the energy storage and pressure stabilization device 2 is already in a working state, if the residual energy pressurizing device is continuously connected to the pipeline, the pressure loss of the energy storage and pressure stabilization device 2 is increased, and the residual energy recovery loses significance. Therefore, the pressure sensor 217 transmits a signal to the controller, the controller controls the first reversing valve 41 to be connected with the complementary energy power generation device, the controller connects the left position of the first reversing valve 41 into the pipeline, the high-pressure strong brine flows into the left position inlet end of the first reversing valve 41 from the recovery water inlet pipe 32, the high-pressure strong brine flowing out of the left position outlet end of the first reversing valve 41 drives the hydraulic motor to drive the three-phase alternating current generator 42 to generate power, the generated electric energy can be used for providing energy for the evaporation crystallization device 5, and the low-pressure strong brine flowing out of the hydraulic motor is discharged into the strong brine recovery box 44.
Wherein, the controller adopts the PLC controller.
The device is subjected to analog simulation under Amesim software, and is shown in attached figures 3 and 4. Fig. 3 is a graph of the relationship between water yield and time under the condition of no energy storage and pressure stabilization device 2, and fig. 4 is a graph of the relationship between water yield and time under the condition of the energy storage and pressure stabilization device 2. The comparison shows that the invention reduces the pulsation of the produced water and improves the stability of the produced water.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A device for sea water desalination and salt production by wave energy and solar energy comprises an energy capture device and a reverse osmosis device, and is characterized in that: the device also comprises an energy storage and pressure stabilization device and a residual energy recovery device, wherein the energy capture device, the energy storage and pressure stabilization device, the reverse osmosis device and the residual energy recovery device are sequentially connected through pipelines; the energy capture device is used for converting seawater into high-pressure seawater and inputting the high-pressure seawater into a pressure-stabilizing water inlet main pipe of the energy storage and pressure stabilization device, the energy storage and pressure stabilization device converts the high-pressure seawater with large energy fluctuation into seawater with stable pressure and inputs the seawater into the reverse osmosis device, the reverse osmosis device carries out seawater desalination treatment again, fresh water and high-pressure strong brine are output after the treatment, and the high-pressure strong brine enters the complementary energy recovery device for complementary energy recovery and utilization;
the energy storage and pressure stabilization device comprises M-level energy storage and pressure stabilization pipelines which are sequentially arranged side by side, the inlet end of the first-level energy storage and pressure stabilization pipeline is connected with the pressure stabilization water inlet header pipe, the inlet ends of two adjacent-level energy storage and pressure stabilization pipelines are connected through connecting pipes, and each connecting pipe forms N-level connecting pipes, wherein N is M-1; a sequence valve is arranged on each stage of connecting pipe, the outlet ends of the M-stage energy storage pressure stabilizing pipelines are converged on a pressure stabilizing water outlet main pipe, and seawater with stable pressure is input into the reverse osmosis device through the pressure stabilizing water outlet main pipe; the energy storage and pressure stabilization pipelines at all levels are provided with energy accumulators and pressure reducing valves, and the energy accumulators are positioned on one side of the inlet ends of the corresponding pressure reducing valves; the set output pressure of M pressure reducing valves of the M-level energy storage and pressure stabilization pipeline is sequentially increased, the set pressure of M energy accumulators of the M-level energy storage and pressure stabilization pipeline is sequentially increased, and the set pressure of the energy accumulators on the same-level energy storage and pressure stabilization pipeline is greater than the set output pressure of the pressure reducing valves; the set opening pressure of N sequence valves on the N-stage connecting pipe is increased in sequence, and the set opening pressure of each sequence valve is larger than the set output pressure of a reducing valve connected with the outlet end of the sequence valve.
2. The wave energy and solar seawater desalination and salt production device of claim 1, wherein: the waste energy recovery device comprises a waste energy power generation device and a waste energy supercharging device, high-pressure strong brine from the reverse osmosis device enters a recovery water inlet pipe of the waste energy recovery device, the tail end of the recovery water inlet pipe is connected with an inlet end of a first reversing valve, two outlet ends of the first reversing valve are respectively connected with the waste energy power generation device and the waste energy supercharging device, the waste energy power generation device drives a generator to generate power by using high-pressure strong brine, the waste energy supercharging device supercharges seawater by using the high-pressure strong brine, and the supercharged high-pressure seawater is converged into a pressure-stabilizing water inlet main pipe of the energy-storing and pressure-stabilizing device again through a recovery water outlet pipe; the pressure stabilizing water inlet main pipe of the energy and pressure stabilizing device is provided with a pressure sensor, the reversing of the first reversing valve is controlled by the pressure value collected by the pressure sensor, and when the pressure value of the pressure sensor is greater than the set output pressure of the pressure reducing valve on the last stage of energy and pressure stabilizing pipeline, the first reversing valve is connected with the waste energy power generation device; when the pressure value of the pressure sensor is not more than the set output pressure of the pressure reducing valve on the last stage of energy storage pressure stabilizing pipeline, the first reversing valve is connected with the residual energy supercharging device.
3. The wave energy and solar seawater desalination and salt production device of claim 2, wherein: high-pressure strong brine discharges to a strong brine collection box through exhaust low pressure strong brine behind the complementary energy recovery unit utilization, and it is right through evaporation crystallization device low pressure strong brine in the strong brine collection box carries out the evaporation crystallization salt manufacturing.
4. The wave energy and solar seawater desalination and salt production device of claim 2, wherein: the complementary energy supercharging device comprises a double-acting supercharger, the double-acting supercharger comprises two large piston cavities in the middle and two small piston cavities at two ends, the two large piston cavities are respectively connected with respective supercharging water inlet branch pipes, one outlet of the first reversing valve is connected with a supercharging water inlet main pipe, and the supercharging water inlet main pipe is connected with the two supercharging water inlet branch pipes through a second reversing valve; the two small piston cavities are respectively connected with respective pressurizing water outlet branch pipes, the tail ends of the two pressurizing water outlet branch pipes are converged on the recovery water outlet pipe, the two small piston cavities are also respectively connected with a seawater inlet pipe, and the seawater inlet pipe respectively provides seawater for the two small piston cavities; the high-pressure strong brine is injected into any large piston cavity to push the piston in the double-acting supercharger to move, so that seawater in the small piston cavity is pressurized and then flows into a pressure stabilizing water inlet main pipe of the energy storage and pressure stabilizing device.
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| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
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| CN115013386B (en) * | 2022-05-30 | 2023-06-23 | 燕山大学 | Hydraulic system protection device control method and control device based on visual recognition |
| CN115557573A (en) * | 2022-09-28 | 2023-01-03 | 山东大学 | Sea wave driven parallel self-adaptive reverse osmosis seawater desalination system and method |
| US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
| CN116903091B (en) * | 2023-08-18 | 2024-01-19 | 广东海洋大学 | Sea water desalination system based on wave energy |
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