Seawater desalination treatment system based on ocean thermoelectric power generation and solar power generation

Abstract

The invention provides a seawater desalination treatment system based on ocean thermoelectric power generation and solar power generation, and relates to the technical field of seawater desalination. Comprising an ocean temperature difference power generation device, a solar power generation device, energy storage equipment, a raw water pump, a pretreatment device, a preheating device, a regulating reservoir, a multi-stage heater, a membrane distillation device, a fresh water recovery device and a sea salt recovery device, and the ocean temperature difference power generation device and the solar power generation device are electrically connected with the energy storage equipment and provide electric energy for the system; the raw water pump is sequentially communicated with the pretreatment device, the preheating device and the adjusting tank through a raw water pipeline, a water outlet of the adjusting tank is sequentially connected with the multi-stage heaters, and an outlet of the last-stage heater is communicated with the membrane distillation device; and a fresh water outlet and a concentrated water outlet of the membrane distillation device are respectively communicated with the fresh water and sea salt recovery device. The system can utilize electric energy generated by ocean temperature difference power generation and solar power generation to realize all-weather seawater desalination treatment, and fresh water supply of remote islands and ocean platforms is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of seawater desalination, and in particular to a seawater desalination processing system based on ocean temperature difference power generation and solar power generation. Background Art

[0002] For remote islands or offshore platforms, fresh water resources are scarce, but there is a large amount of seawater. Seawater cannot be drunk directly, which makes it extremely difficult for humans and other organisms to drink water. Desalinating seawater on site is a better way to obtain fresh water.

[0003] At present, the mainstream desalination methods can be divided into two categories according to the desalination principle: thermal method and membrane method. Membrane desalination is mainly a reverse osmosis desalination process, and thermal desalination technology mainly includes multi-stage flash evaporation and multi-effect evaporation technology. The reverse osmosis desalination system has a large amount of operation and maintenance, high operating costs, poor water quality, and difficult comprehensive utilization of concentrated seawater. Compared with membrane desalination technology, thermal desalination technology has the advantages of low requirements for raw seawater quality, high water production rate, and good water quality. It is currently the most widely used desalination technology.

[0004] However, the existing thermal desalination technology has disadvantages such as high energy consumption and high water production costs, which limit its application on islands or in the open ocean where resources and energy are relatively scarce. It cannot work around the clock and cannot guarantee desalination production on remote islands and offshore platforms to achieve a stable supply of fresh water.

[0005] In view of the above reasons, the present invention proposes a seawater desalination system based on ocean temperature difference power generation and solar power generation to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a seawater desalination system based on ocean temperature difference power generation and solar power generation. The system can utilize the electricity generated by ocean temperature difference power generation and solar power generation to achieve all-weather seawater desalination treatment and ensure the fresh water supply of remote islands and offshore platforms.

[0007] The present invention provides a seawater desalination treatment system based on ocean temperature difference power generation and solar energy power generation, comprising: an ocean temperature difference power generation device, a solar energy power generation device, an energy storage device, a raw water pump, a pretreatment device, a preheating device, a regulating tank, a multi-stage heater, a membrane distillation device, a fresh water recovery device and a sea salt recovery device, wherein the ocean temperature difference power generation device and the solar energy power generation device are both electrically connected to the energy storage device, and the electric energy generated by the two can be transmitted to the energy storage device for storage, and the energy storage device is used to provide electric energy for the system; the raw water pump is electrically connected to the energy storage device, and the raw water pump is sequentially connected to the pretreatment device, the preheating device and the regulating tank through a raw water pipeline, the water outlet of the regulating tank is sequentially connected to the multi-stage heaters, and the outlet of the last stage of the heater is connected to the inlet of the membrane distillation device; the fresh water outlet and the concentrated water outlet of the membrane distillation device are respectively connected to the fresh water recovery device and the sea salt recovery device.

[0008] Preferably, the multiple-stage heaters are all electric heaters, and the electric heaters are all electrically connected to the energy storage device.

[0009] Preferably, the energy storage device is a battery pack.

[0010] Preferably, the pretreatment device comprises a sedimentation tank, an oxidation tank, a softening tank and a filter which are connected in sequence.

[0011] Preferably, the preheating device is a preheating pool, the bottom and sides of the preheating pool are both heat-absorbing materials, and the raw water pipeline preheats the seawater inside it through the preheating pool.

[0012] Preferably, an intermediate water tank is provided between the last-stage heater and the membrane distillation device, and the fresh water outlet of the membrane distillation device is connected to the regulating tank.

[0013] Preferably, the ocean temperature difference power generation device uses ammonia as a working fluid, and includes a working fluid pipeline, a flash evaporator, a turbine, a generator, a condenser, a working fluid storage tank and a working fluid pump. Liquid ammonia is stored in the working fluid storage tank. The flash evaporator, the turbine, the generator, the condenser, the working fluid storage tank and the working fluid pump are connected in a loop in sequence through a working fluid pipeline. The generator is electrically connected to the energy storage device. The flash evaporator is connected to warm seawater through a warm seawater pipeline, and the condenser is connected to cold seawater through a cold seawater pipeline.

[0014] Preferably, the warm seawater pipeline is connected to a warm seawater pump, the cold seawater pipeline is connected to a cold seawater pump, and the warm seawater pumped by the warm seawater pump is preheated by the preheating device before entering the flash evaporator.

[0015] Preferably, the working fluid pump, the warm seawater pump and the cold seawater pump are all electrically connected to the energy storage device, and the electric energy generated by the solar power generation device during the day and stored in the energy storage device can drive the working fluid pump, the warm seawater pump and the cold seawater pump to work.

[0016] Preferably, the solar power generation device comprises a photovoltaic module, a charging controller and an inverter, and the inverter is electrically connected to the energy storage device.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] By setting up an ocean temperature difference power generation device and a solar power generation device, the temperature difference of seawater can be used to generate electricity and solar energy can be used to generate electricity respectively, which can be supplied to islands and offshore platforms, and the electric energy can be stored in energy storage equipment and supplied to the seawater desalination treatment system to obtain fresh water necessary for human life and crop planting; when the sunlight is relatively strong during the day, solar energy and seawater temperature difference can be used to generate electricity together, wherein the electric energy stored in solar power generation can be used for the extraction of seawater and the driving of working fluids during the seawater temperature difference process, so that the electric energy can meet the needs of daily life, and the electric energy can be used for seawater desalination to produce fresh water required for human life and crop planting; in the night environment, the stored electric energy and the temperature difference of seawater can also be used to generate electricity, and the electric energy can be used for seawater desalination; therefore, the system can work around the clock to avoid the inability of solar power generation to meet the fresh water production due to weather and night environment, thereby ensuring the electric energy and fresh water needs of personnel and crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is the overall structural framework diagram of the system of the present invention;

[0021] Figure 2 This is a structural framework diagram of the ocean temperature difference power generation device in the present invention;

[0022] Figure 3 It is a structural framework diagram of the pretreatment device in the present invention;

[0023] Description of reference numerals:

[0024] 1: Ocean temperature difference power generation device; 101: Working fluid pipeline; 102: Flash evaporator; 103: Turbine; 104: Generator; 105: Condenser; 106: Working fluid storage tank; 107: Working fluid pump; 108: Warm seawater pipeline; 109: Cold seawater pipeline; 110: Warm seawater pump; 111: Cold seawater pump; 2: Solar power generation device; 3: Energy storage equipment; 4: Raw water pump; 5: Pretreatment device; 501: Sedimentation tank; 502: Oxidation tank; 503: Softening tank; 504: Filter; 6: Preheating device; 7: Regulating tank; 8: Heater; 9: Membrane distillation device; 10: Fresh water recovery device; 11: Sea salt recovery device; 12: Intermediate water tank. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1-3As shown, the present invention provides a seawater desalination system based on ocean temperature difference power generation and solar power generation, comprising: an ocean temperature difference power generation device 1, a solar power generation device 2, an energy storage device 3, a raw water pump 4, a pretreatment device 5, a preheating device 6, a regulating tank 7, a multi-stage heater 8, a membrane distillation device 9, a fresh water recovery device 10 and a sea salt recovery device 11, the ocean temperature difference power generation device 1 and the solar power generation device 2 are both electrically connected to the energy storage device 3, and the electric energy generated by the two can be transmitted to the energy storage device 3 for storage, and the energy storage device 3 Used to provide the required electric energy for the system; the raw water pump 4 is electrically connected to the energy storage device 3, the raw water pump 4 is connected to the raw water management, and is used to extract seawater for desalination treatment. The raw water pump 4 is connected to the pretreatment device 5, the preheating device 6 and the regulating tank 7 in sequence through the raw water pipeline, the water outlet of the regulating tank 7 is connected to the multi-stage heater 8 in sequence, and the outlet of the last-stage heater 8 is connected to the inlet of the membrane distillation device 9; the fresh water outlet and the concentrated water outlet of the membrane distillation device 9 are respectively connected to the fresh water recovery device 10 and the sea salt recovery device 11.

[0029] In this embodiment, the multi-stage heaters 8 are all electric heaters, and each electric heater is electrically connected to the energy storage device 3. The heater 8 is three-stage, and the preheated seawater can be gradient heated by the three-stage heater 8. The seawater is preheated to 30-55°C by the preheating device 6, the seawater is heated to about 65°C by the first-stage heater 8, the seawater is heated to about 90°C by the second-stage heater 8, and the seawater is heated to about 105°C by the last-stage heater 8.

[0030] In this embodiment, the energy storage device 3 is a battery pack, which can store the electric energy generated by the ocean temperature difference power generation device 1 and the solar power generation device 2 .

[0031] Specifically, the pretreatment device 5 includes a sedimentation tank 501, an oxidation tank 502, a softening tank 503 and a filter 504 which are connected in sequence, wherein the sedimentation tank 501 utilizes the natural sedimentation or coagulation sedimentation of water to remove suspended matter in the water, the oxidation tank 502 is used to purify organic matter in seawater and decompose it into softening tank 503 which is mainly used to remove hardness components in water and reduce the concentration of calcium and magnesium ions in seawater by ion exchange or other methods; the filter 504 is used to further filter the seawater and filter out residual impurities.

[0032] In this embodiment, the preheating device 6 is a preheating pool, the bottom and sides of the preheating pool 6 are heat absorbing materials, and the raw water pipeline preheats the seawater inside through the preheating pool. An intermediate water pool 12 is provided between the last stage heater 8 and the membrane distillation device 9, and the fresh water outlet of the membrane distillation device 9 is connected to the regulating pool 7.

[0033] Specifically, the ocean temperature difference power generation device 1 uses ammonia as a working fluid, and includes a working fluid pipeline 101, a flash evaporator 102, a turbine 103, a generator 104, a condenser 105, a working fluid storage tank 106, and a working fluid pump 107, wherein liquid ammonia is stored in the working fluid storage tank 106, the flash evaporator 102, the turbine 103, the generator 104, the condenser 105, the working fluid storage tank 106, and the working fluid pump 107 are sequentially connected in a cycle through the working fluid pipeline 101, the generator 104 is electrically connected to the energy storage device 3, the flash evaporator 102 is connected to warm seawater through a warm seawater pipeline 108, and the condenser 105 is connected to cold seawater through a cold seawater pipeline 109. A warm seawater pump 110 is connected to the warm seawater pipeline 108, and a cold seawater pump 111 is connected to the cold seawater pipeline 109. The warm seawater pumped by the warm seawater pump 110 is preheated by the preheating device 6 before entering the flash evaporator 102. The working fluid pump 107, warm seawater pump 110 and cold seawater pump 111 are all electrically connected to the energy storage device 3. The electric energy generated by the solar power generation device 2 during the day and stored in the energy storage device 3 can drive the working fluid pump 107, warm seawater pump 110 and cold seawater pump 111 to work, providing a power source for the ocean temperature difference power generation device 1. The condenser 105 is connected to the fresh water recovery device 10, and the fresh water recovery device 10 can collect the fresh water generated by condensation and vaporization in the condenser 105 as a supplement of fresh water.

[0034] In this embodiment, the solar power generation device 2 includes a photovoltaic module, a charging controller and an inverter, and the inverter is electrically connected to the energy storage device.

[0035] When the sunlight is strong during the day, solar energy and the temperature difference of seawater can be used to generate electricity together. Among them, solar power generation is the main power generation method, and the electricity stored in solar power generation can be used as a power source for extracting seawater and driving the working fluid during the temperature difference of seawater. The electricity generated by the two together can be supplied to power grid users to meet daily life needs, and electricity can be used to desalinate seawater to produce fresh water for human life and crop planting. In the night environment, there is insufficient light, and the stored electricity is mainly used as a power source to achieve seawater temperature difference power generation, and the electricity generated by power generation is used to desalinate seawater and supply it to power grid users.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A seawater desalination system based on ocean temperature difference power generation and solar power generation, characterized in that: include: An ocean temperature difference power generation device, a solar power generation device, an energy storage device, a raw water pump, a pretreatment device, a preheating device, a regulating tank, a multi-stage heater, a membrane distillation device, a fresh water recovery device and a sea salt recovery device. The ocean temperature difference power generation device and the solar power generation device are both electrically connected to the energy storage device, and the electric energy generated by the two can be transmitted to the energy storage device for storage. The energy storage device is used to provide electric energy for the system; the raw water pump is electrically connected to the energy storage device, and the raw water pump is connected to the pretreatment device, the preheating device and the regulating tank in sequence through a raw water pipeline. The water outlet of the regulating tank is connected to the multi-stage heater in sequence, and the outlet of the last stage of the heater is connected to the inlet of the membrane distillation device; the fresh water outlet and the concentrated water outlet of the membrane distillation device are respectively connected to the fresh water recovery device and the sea salt recovery device.

2. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 1 is characterized in that: The multiple-stage heaters are all electric heaters, and the electric heaters are all electrically connected to the energy storage device.

3. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 1 is characterized in that: The energy storage device is a battery pack.

4. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 1 is characterized in that: The pretreatment device comprises a sedimentation tank, an oxidation tank, a softening tank and a filter which are connected in sequence.

5. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 1 is characterized in that: The preheating device is a preheating pool, the bottom and sides of the preheating pool are both heat-absorbing materials, and the raw water pipeline preheats the seawater inside the raw water pipeline through the preheating pool.

6. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 1 is characterized in that: An intermediate water tank is arranged between the heater and the membrane distillation device at the last stage, and the fresh water outlet of the membrane distillation device is connected to the regulating tank.

7. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 1 is characterized in that: The ocean temperature difference power generation device uses ammonia as a working fluid, and includes a working fluid pipeline, a flash evaporator, a turbine, a generator, a condenser, a working fluid storage tank and a working fluid pump. Liquid ammonia is stored in the working fluid storage tank. The flash evaporator, the turbine, the generator, the condenser, the working fluid storage tank and the working fluid pump are connected in a loop in sequence through a working fluid pipeline. The generator is electrically connected to the energy storage device. The flash evaporator is connected to warm seawater through a warm seawater pipeline, and the condenser is connected to cold seawater through a cold seawater pipeline.

8. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 7, characterized in that: The warm seawater pipeline is connected to a warm seawater pump, and the cold seawater pipeline is connected to a cold seawater pump. The warm seawater pumped by the warm seawater pump is preheated by the preheating device before entering the flash evaporator.

9. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 8, characterized in that: The working fluid pump, the warm seawater pump and the cold seawater pump are all electrically connected to the energy storage device. The electric energy generated by the solar power generation device during the day and stored in the energy storage device can drive the working fluid pump, the warm seawater pump and the cold seawater pump to work.

10. The seawater desalination system based on ocean temperature difference power generation and solar power generation according to claim 1, characterized in that: The solar power generation device includes a photovoltaic component, a charging controller and an inverter, and the inverter is electrically connected to the energy storage device.

Images