CN106045166B

CN106045166B - Self-service power type double-effect seawater desalination device

Info

Publication number: CN106045166B
Application number: CN201610538333.9A
Authority: CN
Inventors: 贾虎; 袁银梅; 贾雪荣
Original assignee: Anhui University of Technology AHUT
Current assignee: Anhui University of Technology AHUT
Priority date: 2016-07-08
Filing date: 2016-07-08
Publication date: 2020-05-05
Anticipated expiration: 2036-07-08
Also published as: CN106045166A

Abstract

The invention discloses a self-service power type double-effect seawater desalination device, and belongs to the field of seawater desalination. The invention discloses a self-powered double-effect seawater desalination device, which comprises a distillation desalination mechanism, a reverse osmosis desalination mechanism and an electric power system, wherein the distillation desalination mechanism floats on the sea surface and utilizes solar energy to carry out seawater distillation desalination, a seawater filtering module in the reverse osmosis desalination mechanism sinks to a position below 1.5 meters of the sea surface to carry out reverse osmosis seawater desalination, and the seawater filtering module is arranged below the distillation desalination mechanism; the electric power system is used for providing power for pumping water and draining water for the distillation desalination mechanism and the reverse osmosis desalination mechanism. The invention desalts the seawater through the distillation and reverse osmosis, has high desalination efficiency, can be directly and independently used on the sea surface, and is suitable for people living on the island to develop and utilize.

Description

Self-service power type double-effect seawater desalination device

Technical Field

The invention relates to the technical field of seawater desalination, in particular to a self-service power type double-effect seawater desalination device.

Background

Water is a source of life, is the basis of economic and social development, and the demand and quality of fresh water resources are continuously improved along with the economic development and the social progress. China has coastlines which are as long as 1.8 kilometers, and the number of islands with the area of more than 500 square meters is 6961, so that the coastlines are not only bases for marine fishing, offshore culture and marine resource protection, but also army bases and frontier sentries which have the strategic significance of national defense. Most of the sea islands have deficient fresh water resources, and the water quality often does not meet the sanitary standard; some islands have no fresh water at all, and fresh water is supplied mainly by supply ships, so that the cost is high and the islands are easily influenced by weather conditions. Some very remote islands still have the circumstances that the electric power is not enough and can't be supplied, utilize traditional fossil fuel (coal, oil) to solve sea water desalination energy problem, this not only destroys the ecosystem of island easily, and operation and maintenance cost are higher moreover.

As an important offshore strategic base, south China's sea needs to continuously perfect various capital construction works, but because of the shortage of fresh water resources, water resources need to be transported from inland to meet the water demand on the island. As described above, if seawater desalination is performed by using other energy sources, ecological balance on the island is easily damaged, and various resources still need to be transported from inland, and seawater desalination cannot be performed by using local materials, which is a problem commonly existing in various islands and reefs.

Through retrieval discovery, there are many seawater desalination schemes in the prior art, for example, patent No. 201420809193.0 describes a container type solar seawater desalination device, which mainly comprises a solar photovoltaic power generation device, a seawater pretreatment device, a reverse osmosis device, a deep boron removal device and an intelligent control device, wherein a solar cell matrix is connected and installed on the top of a container according to a certain mode, and other devices are integrally installed in the container through a pipeline or an electric wire. The device utilizes solar energy to desalt sea water, but if the water demand on the island is to be satisfied, need great place to place the device, and island area itself is just little, consequently, has certain demand contradiction.

Chinese patent No. 201410300763.8 discloses a high-efficient distillation sea water desalination device, including the desalination device barrel, desalination device barrel top one side is equipped with the sea water entry, equal flow tube is connected to sea water entry one side, the precipitation tank is connected to sea water entry opposite side, the desalination device barrel top is located to the equal flow tube, be equipped with the spray nozzle on the equal flow tube, the inside heat exchange tube assembly that is equipped with of desalination device barrel, the heat exchange tube assembly includes multiunit heat exchange tube bundle, the heat exchange tube downside is located to the heat exchange tube assembly, desalination device barrel bottom is equipped with the fresh water draft tube, fresh water draft tube bottom. The device utilizes the heat exchange tube to accelerate the distillation process to improve the seawater desalination efficiency, but how to generate electricity on islands is also a big problem, if on isolated island reef, it is difficult to carry electric power from inland, leads to the device can not be implemented and applied.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the defect that a seawater desalination device in the prior art cannot be independently used on the sea surface, and provides a self-powered double-effect seawater desalination device.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention discloses a self-powered double-effect seawater desalination device, which comprises a distillation desalination mechanism, a reverse osmosis desalination mechanism and an electric power system, wherein the distillation desalination mechanism floats on the sea surface and utilizes solar energy to carry out seawater distillation desalination, a seawater filtering module in the reverse osmosis desalination mechanism sinks to a position below 1.5 meters of the sea surface to carry out reverse osmosis seawater desalination, and the seawater filtering module is arranged below the distillation desalination mechanism; the electric power system is used for providing power for pumping water and draining water for the distillation desalination mechanism and the reverse osmosis desalination mechanism.

As a further improvement of the invention, the seawater in the first seawater container and the seawater in the second seawater container are distilled and desalted by the distillation and desalting mechanism through the distillation cover and then stored in the distillation water storage tank, the fresh water desalted by the reverse osmosis seawater is stored in the reverse osmosis water storage tank, the first seawater container and the second seawater container in the distillation and desalting mechanism are respectively and correspondingly arranged above the distillation water storage tank and the reverse osmosis water storage tank, the first seawater filtering module and the second seawater filtering module in the seawater filtering module are respectively and correspondingly arranged below the distillation water storage tank and the reverse osmosis water storage tank, and the distillation water storage tank is fixedly connected with the reverse osmosis water storage tank.

As a further improvement of the invention, the power system comprises an electric power storage module, a wind driven generator and/or a water flow generator, wherein the wind driven generator is fixed above the distillation water storage tank through a supporting plate, the water flow generator is fixed at the bottom of the distillation water storage tank, the wind driven generator and/or the water flow generator generates electric power to be stored in the electric power storage module, and the electric power storage module provides power for pumping water and draining water for the distillation desalination mechanism and the reverse osmosis desalination mechanism.

As a further improvement of the invention, the distillation cover comprises a first distillation cover and a second distillation cover, the first distillation cover is in a spherical crown shape, the bottom of the first distillation cover is provided with an annular water collecting tank, and the water collecting tank is connected with the first seawater container through a transition ring; the first seawater container is fixed above the distillation water storage tank, and the water collecting tank is communicated with the distillation water storage tank through at least one first drainage tube.

As a further improvement of the invention, the structure of the second distillation hood is the same as that of the first distillation hood, and the second distillation hood is communicated with the distillation water storage tank through a second drainage tube.

As a further improvement of the present invention, the water supply module of the first seawater container comprises a first water pump, a first controller, a first upper water level detector and a first lower water level detector, wherein the first upper water level detector and the first lower water level detector are arranged at different heights of the first seawater container to detect water level information in the first seawater container, transmit detection signals to the first controller, and control the action of the first water pump through the first controller; the water supply module in the second seawater container has the same structure as the water supply module in the first seawater container.

As a further improvement of the present invention, the distillation water storage tank and the reverse osmosis water storage tank are provided with drainage modules having the same structure, the drainage modules comprise a second water pump, a second controller, a second upper water level detector and a second lower water level detector, the second upper water level detector and the second lower water level detector are arranged at different heights of the distillation water storage tank to detect water level information in the distillation water storage tank, and transmit detection signals to the second controller, and the second controller controls the action of the second water pump to pump fresh water.

As a further improvement of the present invention, the first seawater filtration module comprises a first return pipe, a first filter screen, a stent body flow pipe and reverse osmosis balls, wherein the first return pipe is communicated with the stent body flow pipe through a branch return pipe, the stent body flow pipe is connected with at least three reverse osmosis balls, the reverse osmosis balls are covered by the first filter screen, and fresh water filtered by the reverse osmosis balls is delivered to a reverse osmosis water storage tank through the first return pipe; the second seawater filtering module has the same structure as the first seawater filtering module.

As a further improvement of the invention, an additional reverse osmosis ball is arranged below the reverse osmosis ball connected with the flow pipe of the bracket body, and two longitudinally adjacent reverse osmosis balls are connected through a pipeline connector.

As a further improvement of the invention, the reverse osmosis ball comprises a filter bag, an activated carbon layer, a reverse osmosis membrane and a spherical framework from outside to inside, the spherical framework surrounds a central cavity, and external seawater enters the central cavity through the reverse osmosis.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) according to the self-powered double-effect seawater desalination device, the distillation desalination mechanism is arranged on the sea surface, the reverse osmosis desalination mechanism is arranged in the seawater, the structure is combined up and down, the position space is greatly applied, and double-effect seawater desalination can be performed; in addition, the system is directly arranged in the sea, does not occupy land space, can generate electricity by itself to provide pumping and drainage power, reasonably utilizes resources, does not produce pollution, and is energy-saving and environment-friendly; in addition, the distillation water storage tank is directly placed on the sea surface, the structure is unstable and is easily overturned by wind or water waves, the arranged seawater filtering module has certain gravity, the stability of the distillation water storage tank and the reverse osmosis water storage tank is ensured, the structural design is reasonable, and the principle is simple;

(2) the distillation cover arranged in the distillation desalting mechanism is in a spherical crown shape, the bottom of the first distillation cover is provided with an annular water collecting tank, and then steam is condensed into water drops on the first distillation cover and flows into the water collecting tank along the spherical crown shaped wall, and further flows into the distillation water storage tank through the drainage tube; when the water level in the first seawater container is low, the water pump automatically injects water into the first seawater container, the structural layout is reasonable, and distilled fresh water can be directly drunk;

(3) the seawater filtering module is externally provided with a filtering net, the reverse osmosis ball comprises a filtering bag, an activated carbon layer, a reverse osmosis membrane and a spherical framework from outside to inside, the filtering net can filter aquatic weeds or other aquatic organisms in seawater and prevent the aquatic weeds or other aquatic organisms from attaching to the outside of the reverse osmosis ball, the filtering bag is used for filtering small organisms, the activated carbon layer is used for filtering microorganisms, the reverse osmosis membrane is used for filtering salt molecules, and the spherical framework is used for providing supporting strength; the larger the depth of the seawater filtering module is, the larger the pressure intensity is, and the higher the filtering efficiency is;

(4) the power system comprises a power storage module, a wind driven generator and/or a water flow generator, wherein the power storage module is used for storing electric quantity, the wind driven generator can utilize sea surface wind power to generate electricity, the water flow generator utilizes water flow to generate electricity, and when the power storage module and the water flow generator are used in a matched mode, the power system has enough power.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the double-effect seawater desalination plant of the present invention;

FIG. 2 is a schematic view showing the internal structure of a reverse osmosis ball according to the present invention;

FIG. 3 is a schematic structural diagram of a distillation desalination mechanism in the invention;

fig. 4 is a schematic structural view of a water supply module according to the present invention.

The reference numerals in the schematic drawings illustrate: 101. a first distillation hood; 102. a transition ring; 103. a water collection tank; 104. a first draft tube; 105. a first seawater vessel; 106. distilling the water storage tank; 107. an ear ring; 201. a first pumping pipe; 202. a first water pump; 203. a water inlet pipe; 204. a first controller; 205. a first upper water level detector; 206. a first lower water level detector; 207. an electromagnetic valve; 208. a first drain pipe; 301. an electric storage module; 302. a circuit packing tube; 303. a water current generator; 304. a support plate; 305. a wind power generator; 401. a second pumping pipe; 402. a second water pump; 403. a second drain pipe; 404. a second controller; 405. a second upper water level detector; 406. a second lower water level detector; 501. a first return pipe; 502. a branch return pipe; 503. a first filter screen; 504. a stent body flow tube; 505. a pipe joint; 506. a reverse osmosis ball; 5061. a filter bag; 5062. an activated carbon layer; 5063. a reverse osmosis membrane; 5064. a spherical skeleton; 5065. a central lumen; 507. connecting a base; 601. a connecting rod; 602. a second draft tube; 603. a second distillation cover; 604. a reverse osmosis water storage tank; 605. a second return pipe; 606. a second filter screen; 607. a second seawater vessel.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Example 1

With reference to fig. 1, the self-powered double-effect seawater desalination device of the present embodiment includes a distillation desalination mechanism, a reverse osmosis desalination mechanism and an electric power system, wherein the distillation desalination mechanism floats on the sea surface and uses solar energy to distill and desalinate seawater, a seawater filtration module in the reverse osmosis desalination mechanism sinks below 1.5 meters of the sea surface to desalt reverse osmosis seawater, and the seawater filtration module is disposed below the distillation desalination mechanism and uses the gravity of the seawater filtration module to maintain the stability of the distillation desalination mechanism; the electric power system generates electricity by wind power or water power, or stores a power supply and is used for providing power for pumping water and draining water for the distillation desalination mechanism and the reverse osmosis desalination mechanism.

The distillation desalination mechanism is provided with a first seawater container 105, a second seawater container 607, a distillation water storage tank 106 and a reverse osmosis water storage tank 604, a distillation cover is arranged above the first seawater container 105 and the second seawater container 607, the first seawater container 105 in the distillation desalination mechanism is arranged above the distillation water storage tank 106 and used for storing seawater, the second seawater container 607 is arranged above the reverse osmosis water storage tank 604 and used for storing seawater, when the sun irradiates, seawater evaporates, fresh water drops are formed on the inner wall of the distillation cover, and the water drops flow into the distillation water storage tank 106 for storage after confluence.

Fresh water desalinated by reverse osmosis seawater is stored in a reverse osmosis water storage tank 604, a first seawater filtering module in the seawater filtering modules is arranged below the distillation water storage tank 106, a second seawater filtering module is arranged below the reverse osmosis water storage tank 604, the distillation water storage tank 106 and the reverse osmosis water storage tank 604 are fixedly connected through a connecting rod 601, and a gap is reserved between the distillation water storage tank 106 and the reverse osmosis water storage tank 604. One-way vent valves are arranged above the distillation water storage tank 106 and the reverse osmosis water storage tank 604 and are used for ensuring that the desalinated water can enter.

The distilled water storage tank 106 and the reverse osmosis water storage tank 604 have the same structure, and the upper surface of the distilled water storage tank is horizontal, so that a seawater container and other parts can be conveniently fixed. The lower part of the distilled water storage tank 106 is ellipsoidal, and the radial length is greater than the longitudinal height, so that the stability of the center of gravity is ensured. There are large waves on the sea surface, and if the distillation desalination mechanism is separately arranged without a sea water filtering module, the distillation water storage tank 106 floats on the sea surface and is easy to tip over. The seawater filtering module has larger gravity, so that the distillation water storage tank 106 sinks to a certain water level, and the stability of the structure is further ensured.

In addition, only water is evaporated during distillation, and the seawater desalinated by distillation can be directly drunk; the seawater desalinated by the reverse osmosis can be used as daily life water, so that the two kinds of fresh water are separately stored for later use. When the fresh water in the distilled water storage tank 106 is discharged to the outside, the internal water may be pumped by an external water pump, or the distilled water storage tank 106 may be provided with a water pump to discharge the fresh water to the outside.

In order to continuously desalt the distilled seawater, a water supply module is arranged in the distilled water storage tank 106, a controller and a water level detector are arranged in the water supply module, the power system is used for supplying power, and the seawater is automatically pumped into the first seawater container 105 according to the water level change for desalinization by distillation. The automatic degree of the setting is high, manual operation is not needed, and the automatic setting device is suitable for independent use.

The power system in this embodiment includes the power storage module 301, the wind power generator 305, and the water current generator 303, or may use only the wind power generator 305 or the water current generator 303 alone to generate power, and both are provided in the system in this embodiment in order to ensure sufficient power. The wind power generators 305 are fixed above the distillation water storage tank 106 through the supporting plates 304, that is, the wind power generators 305 are fixed on the outer edge of the upper surface of the distillation water storage tank 106 and are distributed along the circumferential direction of the distillation water storage tank 106, so that the wind power generators can easily receive the incoming wind in all directions, and a plurality of wind power generators 305 can be arranged, and the specific number of the wind power generators is set according to the needs and is not particularly limited.

The water flow generators 303 are fixed at the bottom of the distillation water storage tank 106 and are also distributed along the circumferential direction of the distillation water storage tank 106, and the water flow generators 303 are arranged at positions below the bottom surface of the distillation water storage tank 106, so that the distillation water storage tank 106 can block water flow, and the water flow generators 303 are arranged at the lower part of the distillation water storage tank to obtain a better water flow impact effect, so that the power generation efficiency is improved. The arrangement of the structures in the second seawater container 607 and the reverse osmosis water storage tank 604 is basically the same as the above structure, and detailed description is not needed. The wind power generator 305 and the water flow generator 303 generate electric power to be stored in the electric storage module 301, and the electric storage module 301 provides power for pumping water and draining water for the distillation desalination mechanism and the reverse osmosis desalination mechanism. In order to prevent the wires from being corroded by seawater, the wires are all wrapped by a circuit wrapping pipe (302).

Example 2

The basic structure of the self-powered double-effect seawater desalination apparatus of this embodiment is the same as that of embodiment 1, and further: in this embodiment, the first seawater filtering module comprises a first return pipe 501, a first filter screen 503, a stent body flow pipe 504 and a reverse osmosis ball 506, wherein the first return pipe 501 is communicated with the stent body flow pipe 504 through a branch return pipe 502. A connecting base 507 is arranged at the center of the bottom of the distillation water storage tank 106, the lower end of the branch return pipe 502 is communicated with the bracket body flow pipe 504, and the upper end of the branch return pipe 502 is arranged on the connecting base 507.

In this embodiment, the stent body flow tube 504 is a frame formed by two longitudinal and three transverse pipes, the first return pipe 501 is communicated with the stent body flow tube 504 through three branch return pipes 502, at least three reverse osmosis balls 506 are connected to the stent body flow tube 504, and the reverse osmosis balls 506 are arranged in an array on the pipes forming the stent body flow tube 504. In order to improve the efficiency of seawater desalination, more reverse osmosis balls 506 are needed, and therefore, additional reverse osmosis balls 506 are arranged below the reverse osmosis balls 506 connected with the support body flow pipe 504, namely a plurality of reverse osmosis balls 506 are arranged along the longitudinal direction, and two longitudinally adjacent reverse osmosis balls 506 are connected through a pipeline connector 505. A support body flow tube 504 may also be provided below the bottommost reverse osmosis sphere 506 for structural stability.

It should be noted that the pipe joint 505 is connected with each reverse osmosis ball 506 through a thread, and a slipknot pipe valve is arranged on the pipe joint 505, so that if the reverse osmosis ball 506 is damaged, the reverse osmosis ball can be conveniently and independently replaced, and external seawater cannot flow into the reverse osmosis ball 506.

The reverse osmosis balls 506 arranged in an array form a regular rectangular body, the reverse osmosis balls 506 are covered by a first filter screen 503, and the filter screen is a three-dimensional grid which is surrounded by stainless steel wires with the diameter of 5mm and has the aperture not larger than 1cm and is used for preventing external aquatic weeds or aquatic organisms from damaging the reverse osmosis balls 506 and affecting the normal use of the reverse osmosis balls. The fresh water filtered by the reverse osmosis ball 506 is delivered to the reverse osmosis water storage tank 604 through the first return pipe 501; a second return pipe 605 led out from a second filter screen 606 is intersected with the first return pipe 501 and then is led into the reverse osmosis water storage tank 604, or is respectively communicated with the reverse osmosis water storage tank 604, and other parts of the second seawater filtering module have the same structure as the first seawater filtering module, and are not described again.

Example 3

With reference to fig. 2, the basic structure of the self-powered double-effect seawater desalination apparatus of this embodiment is the same as that of embodiment 2, and further: the reverse osmosis ball 506 in this embodiment includes a filter bag 5061, an activated carbon layer 5062, a reverse osmosis membrane 5063, and a spherical skeleton 5064 from outside to inside, the spherical skeleton 5064 encloses a central cavity 5065, and external seawater enters the central cavity 5065 through reverse osmosis. The filter bag 5061 is used for filtering small organisms in the sea, and the activated carbon layer 5062 has a strong adsorption effect, forms a small circulation space and is used for filtering microorganisms; reverse osmosis membrane 5063 is used for filtering the salt molecule, and spherical skeleton 5064 is used for providing support intensity, and the array is arranged the rivers hole on spherical skeleton 5064, and this rivers hole size is 0.6 ~ 2mm, can adopt stainless steel material preparation to guarantee intensity. The larger the depth of the seawater filtering module is, the larger the pressure intensity is, and the higher the filtering efficiency is.

Example 4

The basic structure of the self-powered double-effect seawater desalination apparatus of this embodiment is the same as that of embodiment 3, and further: the distillation cover in this embodiment comprises a first distillation cover 101 and a second distillation cover 603, and referring to fig. 3, the first distillation cover 101 is spherical cap shaped, i.e. its cross section is arc-shaped, so that the condensed water drops can automatically slide down. The bottom of the first distillation hood 101 is provided with an annular water collecting tank 103, the water collecting tank 103 is connected with a first seawater container 105 through a transition ring 102, the structure is similar to a mushroom shape, water vapor enters the first distillation hood 101 from a middle communication part, then the water vapor is condensed and collected in the water collecting tank 103 to form water flow, the first seawater container 105 is fixed above a distillation water storage tank 106, the water collecting tank 103 is communicated with the distillation water storage tank 106 through at least one first drainage pipe 104, and the water flow can flow into the distillation water storage tank 106 through the first drainage pipe 104 to be stored. In the south China sea area, the temperature is high, and the evaporation is fast under the clear weather, so a plurality of first drainage tubes 104 can be arranged along the annular water collecting tank 103, and the water can be ensured to flow into the distillation water storage tank 106 in time.

The side wall of the distilled water storage tank 106 is also provided with an ear ring 107, and a rope is tied into the ear ring 107 to be fixed with other objects, so that the position of the system in the water is limited, and the system is prevented from being washed away by water waves.

The structure of the second distillation cover 603 in the embodiment is the same as that of the first distillation cover 101, and the second distillation cover 603 is communicated with the distillation water storage tank 106 through the second draft tube 602, namely, the water desalted by the second distillation cover 603 is also stored in the distillation water storage tank 106.

Example 5

With reference to fig. 4, the basic structure of the self-powered double-effect seawater desalination apparatus of this embodiment is the same as that of embodiment 4, and further: the water supply module of the first seawater container 105 includes a first suction pump 202, a first controller 204, a first upper water level detector 205 and a first lower water level detector 206, the first suction pump 202 is connected with a first suction pipe 201, and the first suction pipe 201 is inserted into the external seawater. The outlet of the first suction pump 202 is connected to an inlet pipe 203, and the inlet pipe 203 extends into the first seawater container 105 to input the pumped seawater into the first seawater container 105.

A first upper water level detector 205 and a first lower water level detector 206 are disposed at different heights of the first seawater container 105 to detect water level information in the first seawater container 105, the first upper water level detector 205 is disposed at an upper portion of the first seawater container 105, the first lower water level detector 206 is disposed at a lower portion of the first seawater container 105, when the first lower water level detector 206 detects that the seawater is below the position, a detection signal is transmitted to the first controller 204, and the first suction pump 202 is controlled by the first controller 204 to start pumping water; when the first upper water level detector 205 detects the water level signal, it transmits the signal to the first controller 204 to control the first water pump 202 to stop pumping water. When the water level is detected by the lower water level detector 206 to drop to this level four consecutive times, a counter attached to the first lower water level detector 206 sends a signal to the solenoid valve 207 and automatically drains the remaining water through the drain port of the first seawater container 105. A first drainage pipe 208 is arranged on the drainage port, an electromagnetic valve 207 is arranged on the first drainage pipe 208, the electromagnetic valve 207 is connected with the first controller 204, and the electromagnetic valve 207 is controlled by the first controller 204 to drain residual water in real time. The water supply module in the second seawater container 607 has the same structure as the water supply module in the first seawater container 105, and is not described again.

When the distilled water storage tank 106 and the reverse osmosis water storage tank 604 are fully collected, the fresh water needs to be transported to other places for use, and therefore, a drainage module needs to be arranged to transport the fresh water away. The drainage module can be an opening, water is pumped away through an external water pump, and a water pump can be directly arranged in the system to directly drain water to the outside.

In the second way, the distilled water storage tank 106 and the reverse osmosis water storage tank 604 are provided with drainage modules having the same structure, and taking the distilled water storage tank 106 as an example, the drainage modules include a second suction pump 402, a second controller 404, a second upper water level detector 405 and a second lower water level detector 406. The water pumping port of the second water pump 402 extends to the bottom of the distilled water storage tank 106 through the second water pumping pipe 401, and the water discharging port of the second water pump 402 discharges water to the outside through the second water discharging pipe 403.

The second upper water level detector 405 and the second lower water level detector 406 are disposed at different heights of the distilled water storage tank 106 to detect water level information in the distilled water storage tank 106, the second upper water level detector 405 is disposed at an upper portion of the distilled water storage tank 106, and when the second upper water level detector 405 detects water full information, a detection signal is transmitted to the second controller 404, and the second suction pump 402 is started to discharge water.

The second lower water level detector 406 is disposed near the bottom of the distillation water storage tank 106, and when the second lower water level detector 406 detects a water-free signal, the second lower water level detector transmits the detection signal to the second controller 404, and controls the second water pump 402 to stop pumping water, so as to realize automation of the whole process.

The features of the above embodiments of the present invention may be combined with each other and are not limited to the features described in the embodiments. Aiming at the characteristics, the invention also provides a seawater desalination method based on distillation and reverse osmosis technology, which comprises the following steps:

step 1, placing a self-powered double-effect seawater desalination device in seawater, and fastening a rope on an earring 107 on a fixing pile on land to complete preparation work;

step 2, a wind power generator 305 in the wind blowing power system generates power, a water flow generator 303 generates power under water flow impact, the generated electric quantity is stored in an electric storage module 301, and when the electric quantity reaches a set value, the system starts to be provided with power;

step 3, after power supply, the first lower water level detector 206 in the water supply module detects low water level information, and signals are transmitted to the first controller 204 to control the first water pump 202 to pump water into the seawater container; when the first upper water level detector 205 detects a water full signal, the first water pump 202 stops pumping water and starts distilling and desalinating seawater;

through solar irradiation, the evaporated moisture forms small water drops on the distillation cover, flows into the water collecting tank along the distillation cover, and then enters the distillation water storage tank 106; after the seawater in the seawater container is evaporated to the position of the first lower water level detector 206, injecting water for the second time, and continuing to distill; after 3 times of distillation, the salt content of the residual seawater in the seawater container is large, the electromagnetic valve 207 is automatically opened by the first controller 204, and the residual seawater is discharged by the first water discharge pipe 208; then the first water pump 202 is controlled to start pumping water, so as to circulate;

step 4, when the seawater filtering module is placed under water, the pressure inside the reverse osmosis ball 506 is lower than the external seawater pressure, and the seawater passes through the reverse osmosis ball 506 to enter the central cavity 5065 and finally flows into the reverse osmosis water storage tank 604;

and 5, after the second upper water level detector 405 detects the water flow information, the second water pump 402 starts to pump water to the outside to convey the desalinated seawater to the outside, when the water level reaches the position of the second lower water level detector 406, the second water pump 402 stops pumping water, and the processes of the steps 3 and 4 are repeated.

The seawater desalination device is arranged on the sea surface, so that the land space is not occupied, the whole seawater desalination process does not need human interference, and the automation degree is high; because the power of the whole system is generated by self, no pollutant is discharged, the ecological environment in the seawater is not influenced, and the system is environment-friendly and energy-saving.

In the invention, if only the distillation desalination mechanism is arranged on the sea surface, the distillation water storage tank is easy to topple over by the waves on the sea surface, even if the distillation water storage tank is inclined at a certain angle, the seawater in the seawater container enters the water collecting tank and then flows into the distillation water storage tank, so that the desalinated seawater does not flow into the seawater container, and the seawater cannot be desalinated at all.

According to the invention, the distillation desalination mechanism and the reverse osmosis desalination mechanism are combined, the gravity and the water resistance of the seawater filtering module are utilized to ensure the stability of the distillation water storage tank, even if relatively large wind waves exist, the distillation water storage tank and the reverse osmosis water storage tank can only fluctuate with the waves and can not sway left and right, and a good stabilizing effect is achieved on relatively calm sea surfaces.

And secondly, the distillation water storage tank and the reverse osmosis water storage tank play a role in buoyancy suspension for the seawater filtering module, so that seabed sediment is prevented from entering a filter screen. If only the reverse osmosis desalination mechanism is arranged, the part on the sea surface can not be effectively utilized, so that the two mechanisms are combined, and the sea water desalination efficiency and the stability of the whole system have better effects.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. A self-service power type double-effect seawater desalination device is characterized in that: the solar seawater desalination device comprises a distillation desalination mechanism, a reverse osmosis desalination mechanism and an electric power system, wherein the distillation desalination mechanism floats on the sea surface and utilizes solar energy to carry out seawater distillation desalination, a seawater filtering module in the reverse osmosis desalination mechanism sinks below 1.5 m of the sea surface to carry out reverse osmosis seawater desalination, and the seawater filtering module is arranged below the distillation desalination mechanism; the electric power system is used for providing power for pumping water and draining water for the distillation desalination mechanism and the reverse osmosis desalination mechanism; the seawater in the first seawater container (105) and the second seawater container (607) is distilled and desalinated by a distillation cover through a distillation desalination mechanism and then is stored in a distillation water storage tank (106), the distillation cover comprises a first distillation cover (101) and a second distillation cover (603), the first distillation cover (101) is in a spherical crown shape, the bottom of the first distillation cover (101) is provided with an annular water collecting tank (103), and the water collecting tank (103) is connected with the first seawater container (105) through a transition ring (102); the first seawater container (105) is fixed above the distillation water storage tank (106), and the water collecting tank (103) is communicated with the distillation water storage tank (106) through at least one first drainage tube (104).

2. The self-powered double-effect seawater desalination plant according to claim 1, characterized in that: fresh water for reverse osmosis seawater desalination is stored in a reverse osmosis water storage tank (604), a first seawater container (105) and a second seawater container (607) in a distillation desalination mechanism are respectively and correspondingly arranged above the distillation water storage tank (106) and the reverse osmosis water storage tank (604), a first seawater filtering module and a second seawater filtering module in a seawater filtering module are respectively and correspondingly arranged below the distillation water storage tank (106) and the reverse osmosis water storage tank (604), and the distillation water storage tank (106) is fixedly connected with the reverse osmosis water storage tank (604).

3. The self-powered double-effect seawater desalination plant according to claim 1, characterized in that: the power system comprises a power storage module (301), a wind driven generator (305) and/or a water flow generator (303), wherein the wind driven generator (305) is fixed above the distillation water storage tank (106) through a supporting plate (304), the water flow generator (303) is fixed at the bottom of the distillation water storage tank (106), the wind driven generator (305) and/or the water flow generator (303) generate power to be stored in the power storage module (301), and power for pumping water and draining water is provided for the distillation desalination mechanism and the reverse osmosis desalination mechanism through the power storage module (301).

4. The self-powered double-effect seawater desalination plant according to claim 2, characterized in that: the structure of the second distillation cover (603) is the same as that of the first distillation cover (101), and the second distillation cover (603) is communicated with the distillation water storage tank (106) through a second drainage pipe (602).

5. The self-powered double-effect seawater desalination plant according to claim 2, characterized in that: the water supply module of the first seawater container (105) comprises a first water suction pump (202), a first controller (204), a first upper water level detector (205) and a first lower water level detector (206), wherein the first upper water level detector (205) and the first lower water level detector (206) are arranged at different positions of the first seawater container (105) to detect water level information in the first seawater container (105), the detection signals are transmitted to the first controller (204), and the first controller (204) is used for controlling the action of the first water suction pump (202); the water supply module in the second seawater container (607) has the same structure as the water supply module in the first seawater container (105).

6. The self-powered double-effect seawater desalination plant according to claim 2, characterized in that: the distilled water storage tank (106) and the reverse osmosis water storage tank (604) are internally provided with a drainage module with the same structure, the drainage module comprises a second water suction pump (402), a second controller (404), a second upper water level detector (405) and a second lower water level detector (406), the second upper water level detector (405) and the second lower water level detector (406) are arranged at different heights of the distilled water storage tank (106) to detect water level information in the distilled water storage tank (106), the detection signals are transmitted to the second controller (404), and the second controller (404) controls the action of the second water suction pump (402) to pump fresh water.

7. The self-powered double-effect seawater desalination plant according to claim 2, characterized in that: the first seawater filtering module comprises a first return pipe (501), a first filter screen (503), a support body flow pipe (504) and reverse osmosis balls (506), the first return pipe (501) is communicated with the support body flow pipe (504) through a branch return pipe (502), the support body flow pipe (504) is connected with at least three reverse osmosis balls (506), the reverse osmosis balls (506) are covered by the first filter screen (503), and fresh water filtered by the reverse osmosis balls (506) is conveyed to a reverse osmosis water storage tank (604) through the first return pipe (501); the second seawater filtering module has the same structure as the first seawater filtering module.

8. The self-powered double-effect seawater desalination plant according to claim 7, characterized in that: an additional reverse osmosis ball (506) is arranged below the reverse osmosis ball (506) connected with the support body flow pipe (504), and two longitudinally adjacent reverse osmosis balls (506) are connected through a pipeline connector (505).

9. The self-powered double-effect seawater desalination plant according to claim 8, characterized in that: the reverse osmosis ball (506) comprises a filter bag (5061), an activated carbon layer (5062), a reverse osmosis membrane (5063) and a spherical skeleton (5064) from outside to inside, the spherical skeleton (5064) surrounds a central cavity (5065), and external seawater enters the central cavity (5065) through reverse osmosis.