Membrane method seawater desalination system

Abstract

The invention discloses a membrane-method seawater desalination system which comprises a first-stage reverse osmosis membrane array, a last-stage reverse osmosis membrane array, a fresh water collection container, a concentrated water collection container and a plurality of electric control switches, and the first-stage reverse osmosis membrane array and the last-stage reverse osmosis membrane array each comprise a plurality of reverse osmosis membrane modules. The reverse osmosis membrane modules are arranged according to a preset matrix mode, the output end of each reverse osmosis membrane module is provided with a fresh water output pipeline and a concentrated water output pipeline, the fresh water output pipelines and the concentrated water output pipelines are provided with electric control switches, and the fresh water output pipelines and the concentrated water output pipelines are connected through control over opening and closing of the electric control switches. The series-parallel connection between the reverse osmosis membrane modules can be realized according to an application scene to adapt to the requirement of quickly producing fresh water, and the fresh water collecting container and the concentrated water collecting container are configured to respectively collect fresh water and concentrated water generated in the seawater desalination process; the technical problems that high-purity fresh water and high seawater desalination efficiency are difficult to obtain according to actual production requirements in an existing membrane method seawater desalination mode are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of seawater desalination, and particularly to a membrane method seawater desalination system. Background Art

[0002] The membrane method is a method for desalinating seawater by utilizing the principle of osmotic pressure. When fresh water and seawater are separated by a semi-permeable membrane, under normal circumstances, water molecules in the fresh water will permeate to the seawater side under the action of osmotic pressure. When a pressure greater than the osmotic pressure is applied to the seawater side, water molecules in the seawater can permeate through the semi-permeable membrane to the fresh water side, while ions generated by salts in the seawater cannot pass through the semi-permeable membrane due to their large volume, so that water molecules and salt molecules are separated to obtain fresh water.

[0003] Although the existing membrane method seawater desalination methods can achieve the effect of multi-stage seawater desalination, it is difficult to obtain fresh water with high purity and high seawater desalination efficiency according to actual production requirements. Summary of the Invention

[0004] The present invention provides a membrane method seawater desalination system for solving the technical problem that it is difficult to obtain fresh water with high purity and high seawater desalination efficiency according to actual production requirements by the existing membrane method seawater desalination methods.

[0005] In view of this, the present invention provides a membrane method seawater desalination system, including a first-stage reverse osmosis membrane array, a final-stage reverse osmosis membrane array, a fresh water collection container, a concentrated water collection container, and a plurality of electric control switches;

[0006] Both the first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array include a plurality of reverse osmosis membrane modules, and the plurality of reverse osmosis membrane modules are arranged in a preset matrix manner. The input end of each reverse osmosis membrane module in the first-stage reverse osmosis membrane array is commonly connected to the same raw water output port through respective input pipelines. An electric control switch is configured at the output end of each reverse osmosis membrane module in the first-stage reverse osmosis membrane array. After passing through the electric control switch, the output end of each reverse osmosis membrane module in the first-stage reverse osmosis membrane array is commonly connected to the inlet of the first common output pipeline through a first communication pipeline. The number of rows and columns of the preset matrix is not less than 2;

[0007] The input end of each reverse osmosis membrane module in the final-stage reverse osmosis membrane array is commonly connected to the outlet of the first common output pipeline through respective input pipelines. An electric control switch is configured at the output end of each reverse osmosis membrane module in the final-stage reverse osmosis membrane array. After passing through the electric control switch, the output end of each reverse osmosis membrane module in the final-stage reverse osmosis membrane array is commonly connected to the inlet of the second common output pipeline through a second communication pipeline;

[0008] The output ends of each reverse osmosis membrane module in the primary reverse osmosis membrane array and the final reverse osmosis membrane array are respectively configured with a fresh water output pipeline and a concentrated water output pipeline. Electric control switches are configured on both the fresh water output pipeline and the concentrated water output pipeline. The fresh water output pipeline is connected to the fresh water collection container, and the concentrated water output pipeline is connected to the concentrated water collection container.

[0009] Optionally, it further includes at least one intermediate reverse osmosis membrane array. The structure of the intermediate reverse osmosis membrane array is the same as that of the primary reverse osmosis membrane array. The intermediate reverse osmosis membrane array is connected between the primary reverse osmosis membrane array and the final reverse osmosis membrane array. And when there are no less than two intermediate reverse osmosis membrane arrays, they are connected between the primary reverse osmosis membrane array and the final reverse osmosis membrane array in a sequentially series-connected manner.

[0010] Optionally, two electric control switches are configured on the connecting pipeline of each reverse osmosis membrane module that is connected to the fresh water collection container. The two electric control switches are connected to the inlet of the next-stage reverse osmosis membrane array through an intermediate pipeline configured with an electric control switch.

[0011] Optionally, it further includes an energy storage and release system;

[0012] The energy storage and release system includes an energy storage tank group, a release tank group, and a reserve tank group. Each tank of the energy storage tank group, the release tank group, and the reserve tank group is configured with an input switch and an output switch. The energy storage tank group, the release tank group, and the reserve tank group are respectively configured with a seawater input main switch and a seawater output main switch. The seawater input main switches of the energy storage tank group, the release tank group, and the reserve tank group are commonly connected to the energy storage main switch. The seawater output main switches of the energy storage tank group, the release tank group, and the reserve tank group are commonly connected to the release main switch. The release main switch is connected to the raw water output port.

[0013] Optionally, it further includes a pressure gauge, which is installed at the rear end of the release main switch and is used to measure the pressure at the rear end of the release main switch.

[0014] Optionally, it further includes a controller;

[0015] The controller is electrically connected to all electric control switches, the seawater input main switch, the seawater output main switch, the energy storage main switch, the release main switch, and the pressure gauge respectively;

[0016] The controller is used to control the opening and closing states of all electric control switches according to the pressure at the rear end of the release main switch to control the series-parallel states of the primary reverse osmosis membrane array, the intermediate reverse osmosis membrane array, and the final reverse osmosis membrane array, so that when the pressure at the rear end of the release main switch is greater than the preset pressure, the primary reverse osmosis membrane array, the intermediate reverse osmosis membrane array, and the final reverse osmosis membrane array carry out seawater desalination in a one-stage multi-section cyclic seawater desalination mode, and when the pressure at the rear end of the release main switch is not greater than the preset pressure, they carry out seawater desalination in a one-stage multi-section continuous seawater desalination mode;

[0017] The first - stage multi - stage cyclic seawater desalination mode is to collect the concentrated water generated after desalinating the raw water, and the fresh water generated is sent to the next - stage desalination.

[0018] The first - stage multi - stage continuous seawater desalination mode is to collect the fresh water generated after desalinating the raw water, and the concentrated water generated is sent to the next - stage desalination.

[0019] Optionally, when the pressure at the rear end of the energy - releasing main switch is less than 6 MPa, the controller determines whether the pressure at the rear end of the energy - releasing main switch is greater than 3 MPa. If so, it further determines whether the pressure at the rear end of the energy - releasing main switch is greater than 5 MPa. If it is greater than 5 MPa, the first - stage multi - stage cyclic seawater desalination mode is used for seawater desalination. If it is not greater than 5 MPa, the first - stage multi - stage continuous seawater desalination mode is used for seawater desalination. If the pressure at the rear end of the energy - releasing main switch is not greater than 3 MPa, the output switches of the unopened energy - releasing tanks are turned on one by one. After each output switch of an unopened energy - releasing tank is turned on, an operation of determining whether the pressure at the rear end of the energy - releasing main switch is greater than 3 MPa is performed.

[0020] When the pressure at the rear end of the energy - releasing main switch is not less than 6 MPa, the controller turns off the output switches of the opened energy - releasing tanks one by one. After each output switch of an opened energy - releasing tank is turned off, an operation of determining whether the pressure at the rear end of the energy - releasing main switch is greater than 3 MPa is performed.

[0021] Optionally, it further includes an energy recovery device.

[0022] The energy recovery device includes a water - jet pipe, a first power - generation component, and a second power - generation component.

[0023] The first power - generation component includes an outer - ring stator, an outer - ring rotor, an outer - ring bearing, an outer - ring support column, and paddles. The bottom of the inner ring of the outer - ring bearing is fixedly connected to the top of the outer - ring support column. The outer - ring rotor is installed on the frame at the top of the inner ring of the outer - ring bearing, the outer - ring stator is installed on the frame at the top of the outer ring of the outer - ring bearing, and a number of vertically - installed paddles are fixedly installed circumferentially on the outer surface of the outer - ring support column.

[0024] The second power - generation component includes an inner - ring stator, an inner - ring rotor, an inner - ring bearing, an inner - ring support column, and blades. The bottom of the inner ring of the inner - ring bearing is fixedly connected to the top of the inner - ring support column. The inner - ring rotor is installed on the frame at the top of the inner ring of the inner - ring bearing, the inner - ring stator is installed on the frame at the top of the outer ring of the inner - ring bearing, and a number of vertically - installed blades are fixedly installed circumferentially on the bottom side of the inner - ring support column. The bottom of the outer - ring support column is higher than the top of the blades. The blades are inclined at a preset angle, and the distance from the end of the blade to the center of the inner - ring support column is not less than the distance from the end of the paddle to the center of the outer - ring support column. The inner - ring bearing is arranged inside the inner ring of the outer - ring bearing.

[0025] Optionally, the second power - generation component further includes a support baffle and a support spring.

[0026] The support baffle and the support spring are located between the bottom of the outer ring strut and the top of the blade. One end of the support spring is fixedly connected to the bottom side of the support baffle facing the inner ring strut, and the other end of the support spring is fixedly connected to the side of the inner ring strut. The top of the support baffle is movably connected to the bottom of the outer ring strut. The bottom of the support baffle is inclined outward in the vertical direction. The distance from the outermost side of the support baffle to the center of the inner ring strut is less than the distance from the end of the blade to the center of the inner ring strut.

[0027] Optionally, there are multiple support baffles and support springs, and the multiple support baffles and support springs are arranged circumferentially around the inner ring strut.

[0028] As can be seen from the above technical solutions, the membrane method seawater desalination system provided by the present invention has the following advantages:

[0029] The membrane method seawater desalination system provided by the present invention includes a primary reverse osmosis membrane array, a final reverse osmosis membrane array, a fresh water collection container, a concentrated water collection container, and several electric control switches. Both the primary reverse osmosis membrane array and the final reverse osmosis membrane array include multiple reverse osmosis membrane modules. The multiple reverse osmosis membrane modules are arranged in a preset matrix manner. The output ends of each reverse osmosis membrane module are respectively configured with a fresh water output pipeline and a concentrated water output pipeline. Electric control switches are configured on both the fresh water output pipeline and the concentrated water output pipeline. By controlling the opening and closing of the electric control switches, the series and parallel connections between the reverse osmosis membrane modules can be realized according to the actual application scenarios. In the occasion where the pressure energy release is large, the parallel connection mode between the reverse osmosis membrane modules is adopted to quickly produce fresh water. In the occasion where the pressure energy release is small, the series connection mode between the reverse osmosis membrane modules is adopted to quickly produce fresh water. At the same time, a fresh water collection container and a concentrated water collection container are configured to respectively collect the fresh water and concentrated water generated by the reverse osmosis membrane modules during the seawater desalination process, solving the technical problem that it is difficult to obtain fresh water with high purity and high seawater desalination efficiency according to the actual production requirements in the existing membrane method seawater desalination method.

[0030] At the same time, the membrane method seawater desalination system provided by the present invention is provided with a surplus energy recovery device to further generate hydraulic power from the concentrated water obtained by seawater desalination, improving the utilization efficiency of water resources and also improving the power generation efficiency.

[0031] In the membrane method seawater desalination system provided by the present invention, a pressure regulating device is installed on the water injection pipeline near the water injection outlet. The water injection speed of the water injection outlet can be adjusted through the pressure regulating device, thereby controlling the rotation speed of the outer ring rotor. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a schematic diagram of the overall structure of a membrane method seawater desalination system provided in an embodiment of the present invention;

[0034] Figure 2 It is a connection schematic diagram of a reverse osmosis membrane array provided in an embodiment of the present invention;

[0035] Figure 3 For Figure 2 the right view of the reverse osmosis membrane array in

[0036] Figure 4 It is a pipeline connection schematic diagram of a first-stage multi-stage circulation seawater desalination mode and a first-stage multi-stage continuous seawater desalination mode provided in an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of the structure of an energy storage and energy release system provided in an embodiment of the present invention;

[0038] Figure 6 It is a control block diagram of a membrane method seawater desalination system provided in an embodiment of the present invention;

[0039] Figure 7 It is a schematic cross-sectional view of the overall structure of a dual-axis power generation device provided in an embodiment of the present invention;

[0040] Figure 8 It is a schematic diagram of the structure of a first power generation component and a second power generation component provided in an embodiment of the present invention;

[0041] Figure 9 It is a schematic diagram of the curve of the lift coefficient and drag coefficient of the blade of the second power generation component varying with the angle of attack provided in an embodiment of the present invention;

[0042] Figure 10 It is a schematic diagram of the angle of attack between the blade of the second power generation component and the water flow direction provided in an embodiment of the present invention;

[0043] Figure 11 It is a schematic diagram of the installation of a support baffle provided in an embodiment of the present invention;

[0044] Figure 12 It is a schematic diagram of the structure of a pressure regulating device provided in an embodiment of the present invention;

[0045] Figure 13Schematic diagram of the detachable housing provided in the embodiment of the present invention;

[0046] Among them, the reference numerals are:

[0047] 100, primary reverse osmosis membrane array; 101, final reverse osmosis membrane array; 102, fresh water collection container; 103, concentrated water collection container; 104, electric control switch; 105, intermediate reverse osmosis membrane array; 106, reverse osmosis membrane module; 107, waste energy recovery device; 1, water injection pipeline; 2, first power generation component; 2-1, outer stator; 2-2, outer rotor; 2-3, outer bearing; 2-4, outer support column; 2-5, paddle; 3, second power generation component; 3-1, inner stator; 3-2, inner rotor; 3-3, inner bearing; 3-4, inner support column; 3-5, blade; 3-6, support baffle; 3-7, support spring; 4, pressure regulating device; 4-1, water pipe support frame; 4-2, rotating motor; 4-3, lead screw; 4-4, elastic blocking gasket; 5, detachable housing; G1, energy release tank group; G2, reserve tank group; G3, energy storage tank group; S1, input switch; S2, output switch; S3, total seawater input switch; S4, total seawater output switch; S5, total energy storage switch; S6, total energy release switch; T1, pressure gauge; W1, first communication pipeline; W11, first common output pipeline; W2, second communication pipeline; W22, second common output pipeline. Specific embodiments

[0048] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0049] For the convenience of understanding, please refer to Figures 1 to 3 , an embodiment of a membrane method seawater desalination system provided in the present invention includes a primary reverse osmosis membrane array 100, a final reverse osmosis membrane array 101, a fresh water collection container 102, a concentrated water collection container 103 and a plurality of electric control switches 104;

[0050] The first-stage reverse osmosis membrane array 100 and the last-stage reverse osmosis membrane array 101 both include a plurality of reverse osmosis membrane modules 106. The plurality of reverse osmosis membrane modules 106 are arranged in a preset matrix manner. The input ends of each reverse osmosis membrane module 106 in the first-stage reverse osmosis membrane array 100 are commonly connected to the same raw water outlet through their respective input pipes. An electric control switch 104 is configured at the output end of each reverse osmosis membrane module 106 in the first-stage reverse osmosis membrane array 100. The output end of each reverse osmosis membrane module 106 in the first-stage reverse osmosis membrane array 100 is commonly connected to the inlet of the first common output pipe W11 through the electric control switch 104 via the first communication pipe W1. The number of rows and columns of the preset matrix is not less than 2;

[0051] The input ends of each reverse osmosis membrane module 106 in the last-stage reverse osmosis membrane array 101 are commonly connected to the outlet of the first common output pipe W11 through their respective input pipes. An electric control switch 104 is configured at the output end of each reverse osmosis membrane module 106 in the last-stage reverse osmosis membrane array 101. The output end of each reverse osmosis membrane module 106 in the last-stage reverse osmosis membrane array 101 is commonly connected to the inlet of the second common output pipe W22 through the electric control switch 104 via the second communication pipe W2;

[0052] Fresh water output pipes and concentrated water output pipes are respectively configured at the output ends of each reverse osmosis membrane module 106 in the first-stage reverse osmosis membrane array 100 and the last-stage reverse osmosis membrane array 101. Electric control switches 104 are configured on both the fresh water output pipes and the concentrated water output pipes. The fresh water output pipes are connected to the fresh water collection container 102, and the concentrated water output pipes are connected to the concentrated water collection container 103.

[0053] It should be noted that each reverse osmosis membrane module 106 will produce concentrated water and fresh water after seawater desalination. The concentrated water is connected to the concentrated water collection container 103 through the concentrated water output pipe configured with the electric control switch 104, and the fresh water is connected to the fresh water collection container 102 through the fresh water pipe configured with the electric control switch 104. The electric control switch 104 is used to control the connection state of the pipe through its on-off state. At the same time, the series-parallel relationship between the reverse osmosis membrane modules 106 can be realized through the electric control switches 104 between the reverse osmosis membrane modules 106. When the seawater desalination process belongs to the occasion with large pressure energy release (>6 MPa), the reverse osmosis membrane modules 106 are connected in parallel. When the seawater desalination process belongs to the occasion with small pressure energy release (<6 MPa), the reverse osmosis membrane modules 106 are connected in series. As Figure 3 shown, when all the electric control switches 104 on a certain cross-section of the reverse osmosis membrane array are only opened, only all the reverse osmosis membrane modules 106 on this cross-section are utilized ( Figure 3Among them, 9 reverse osmosis membrane modules 106 arranged in a 3×3 pattern are used for seawater desalination, which is generally used in occasions where the pressure energy release is small but fresh water is expected to be produced as soon as possible. When the seawater desalination process belongs to the occasion where the pressure energy release is large and rapid fresh water production is required, the electric control switch 104 of the subsequent section can be continuously opened, that is, the reverse osmosis membrane modules 106 on the subsequent section are connected in series to the reverse osmosis membrane modules 106 on the previous section.

[0054] The membrane method seawater desalination system provided by the present invention includes a primary reverse osmosis membrane array 100, a final reverse osmosis membrane array 101, a fresh water collection container 102, a concentrated water collection container 103, and a plurality of electric control switches 104. Both the primary reverse osmosis membrane array 100 and the final reverse osmosis membrane array 101 include a plurality of reverse osmosis membrane modules 106. The plurality of reverse osmosis membrane modules 106 are arranged in a preset matrix manner. The output ends of each reverse osmosis membrane module 106 are respectively configured with a fresh water output pipeline and a concentrated water output pipeline. Electric control switches 104 are arranged on both the fresh water output pipeline and the concentrated water output pipeline. By controlling the opening and closing of the electric control switch 104, the series and parallel connections between the reverse osmosis membrane modules 106 can be realized according to the actual application scenario. In the occasion where the pressure energy release is large, the parallel connection between the reverse osmosis membrane modules 106 is adopted to realize rapid fresh water production. In the occasion where the pressure energy release is small, the series connection between the reverse osmosis membrane modules 106 is adopted to realize rapid fresh water production. At the same time, the fresh water collection container 102 and the concentrated water collection container 103 are configured to collect the fresh water and concentrated water generated by the reverse osmosis membrane modules 106 during the seawater desalination process respectively, solving the technical problem that the existing membrane method seawater desalination method is difficult to adapt to the demand of rapid fresh water production according to the actual seawater pressure.

[0055] In one embodiment, as Figures 1 to 3 shown, each reverse osmosis membrane module 106 includes 4 reverse osmosis membrane cavities arranged in a 2×2 matrix, and the 4 reverse osmosis membrane cavities share one inlet and one outlet.

[0056] In one embodiment, as Figure 2 shown, the membrane method seawater desalination system provided by the present invention further includes at least 1 intermediate reverse osmosis membrane array 105. The structure of the intermediate reverse osmosis membrane array 105 is the same as that of the primary reverse osmosis membrane array 100. The intermediate reverse osmosis membrane array 105 is connected between the primary reverse osmosis membrane array 100 and the final reverse osmosis membrane array 101, and when there are no less than 2 intermediate reverse osmosis membrane arrays 105, they are connected between the primary reverse osmosis membrane array 100 and the final reverse osmosis membrane array 101 in a sequentially series-connected manner. Taking Figure 2 and Figure 3 as an example, among them, Figure 2 the right views of the primary reverse osmosis membrane array 100, the final reverse osmosis membrane array 101, and the intermediate reverse osmosis membrane array 105 in Figure 3The same. When the electric control switches 104 at the coordinate points (1, 1, 1), (2, 1, 1), (3, 1, 1), and (4, 1, 1) are turned on and the electric control switches 104 in other places are turned off, the series connection on the path of (1, 1, 1), (2, 1, 1), (3, 1, 1), and (4, 1, 1) can be achieved. When all the electric control switches 104 on the cross-section where the fourth column is located, that is, where the x-axis is equal to 4, are turned on simultaneously, the parallel connection of the seawater desalination path is achieved. There is at least 1 intermediate reverse osmosis membrane array 105 cascaded between the primary reverse osmosis membrane array 100 and the final reverse osmosis membrane array 101, which can further form a multi-stage seawater desalination mode to further obtain purer fresh water and denser seawater.

[0057] In one embodiment, two electric control switches 104 are arranged on the communication pipeline connecting each reverse osmosis membrane module 106 to the fresh water collection container 102. The two electric control switches 104 are connected to the inlet of the next-stage reverse osmosis membrane array through an intermediate pipeline configured with an electric control switch 104. All the electric control switches 104 are connected to a controller, and the controller is used to control the opening and closing states of all the electric control switches 104 according to the input pressure of the primary reverse osmosis membrane array 100. When the input pressure of the primary reverse osmosis membrane array 100 is greater than the preset pressure, the membrane method seawater desalination system uses a one-stage multi-stage cyclic seawater desalination mode to desalinate seawater to obtain fresher fresh water. When the input pressure of the primary reverse osmosis membrane array 100 is not greater than the preset pressure, the membrane method seawater desalination system uses a one-stage multi-stage continuous seawater desalination mode to desalinate seawater to obtain a higher desalination efficiency under low pressure energy conditions. The one-stage multi-stage cyclic seawater desalination mode is to collect the concentrated water generated after desalinating the raw water, and the fresh water generated is sent to the next stage for desalination. The one-stage multi-stage continuous seawater desalination mode is to collect the fresh water generated after desalinating the raw water, and the concentrated water generated is sent to the next stage for desalination. As Figure 4 shown, when the electric control switches 104 #1, #2, #4 are turned on (correspondingly, #6, #7, #8 are turned on), and #3, #5 are turned off (correspondingly, #9, #10 are turned off), the membrane method seawater desalination system is in a one-stage multi-stage continuous seawater desalination mode; when the electric control switches 104 #1, #3, #5 are turned on (correspondingly, #6, #8, #10 are turned on), and #2, #4 are turned off (correspondingly, #7, #9 are turned off), the membrane method seawater desalination system is in a one-stage multi-stage cyclic seawater desalination mode.

[0058] In one embodiment, the membrane method seawater desalination system provided in the present invention further includes an energy storage and energy release system. As Figure 5As shown, the energy storage and release system includes an energy storage tank group G3, an energy release tank group G1, and a reserve tank group G2. Each tank of the energy storage tank group G3, the energy release tank group G1, and the reserve tank group G2 is equipped with an input switch S1 and an output switch S2. The energy storage tank group G3, the energy release tank group G1, and the reserve tank group G2 are respectively equipped with a seawater input main switch S3 and a seawater output main switch S4. The seawater input main switches S3 of the energy storage tank group G3, the energy release tank group G1, and the reserve tank group G2 are commonly connected to the energy storage main switch S5. The seawater output main switches S4 of the energy storage tank group G3, the energy release tank group G1, and the reserve tank group G2 are commonly connected to the energy release main switch S6. The energy release main switch S6 is connected to the raw water output port. Specifically, as Figure 5 shown, the energy storage tank group G3, the energy release tank group G1, and the reserve tank group G2 can each be composed of 10 tanks. In the initial stage, the energy storage tank group G3, the energy release tank group G1, and the reserve tank group G2 are all filled with seawater. Subsequently, the output switch S2 of a certain group is opened, and this group serves as the energy release group, while the other two groups are the reserve tank group G2 and the energy storage tank group G3 respectively. When the energy of the energy release tank group G1 is almost exhausted, its seawater output main switch S4 is closed, and it becomes the energy storage group. At this time, the reserve tank group G2 becomes the energy release tank group G1, and the energy storage tank group G3 becomes the reserve tank group G2. And so on.

[0059] A pressure gauge T1 is installed at the rear end of the energy release main switch S6. The pressure gauge T1 is used to measure the pressure at the rear end of the energy release main switch S6. The controller is electrically connected to all the electric control switches, the seawater input main switch S3, the seawater output main switch S4, the energy storage main switch S5, the energy release main switch S6, and the pressure gauge T1 respectively. The controller is used to control the opening and closing states of all the electric control switches according to the pressure at the rear end of the energy release main switch S6 to control the series-parallel states of the first-stage reverse osmosis membrane array, the intermediate stage of the reverse osmosis membrane array, and the last-stage reverse osmosis membrane array, so that when the pressure at the rear end of the energy release main switch S6 is greater than the preset pressure, the seawater desalination is carried out in a one-stage multi-stage cyclic seawater desalination mode, and when the pressure at the rear end of the energy release main switch S6 is not greater than the preset pressure, the seawater desalination is carried out in a one-stage multi-stage continuous seawater desalination mode. Specifically, as Figure 6As shown, when the pressure at the rear end of the energy-releasing main switch S6 is less than 6 MPa, the controller determines whether the pressure at the rear end of the energy-releasing main switch S6 is greater than 3 MPa. If so, it further determines whether the pressure at the rear end of the energy-releasing main switch S6 is greater than 5 MPa. If it is greater than 5 MPa, the seawater desalination is carried out in a first-stage multi-stage cyclic seawater desalination mode. If it is not greater than 5 MPa, the seawater desalination is carried out in a first-stage multi-stage continuous seawater desalination mode. If the pressure at the rear end of the energy-releasing main switch S6 is not greater than 3 MPa, the output switches S2 of the unopened energy-releasing tanks are sequentially opened. After each output switch S2 of an unopened energy-releasing tank is opened, the operation of determining whether the pressure at the rear end of the energy-releasing main switch S6 is greater than 3 MPa is carried out. When the pressure at the rear end of the energy-releasing main switch S6 is not less than 6 MPa, the output switches S2 of the opened energy-releasing tanks are sequentially closed. After each output switch S2 of an opened energy-releasing tank is closed, the operation of determining whether the pressure at the rear end of the energy-releasing main switch S6 is greater than 3 MPa is carried out. It not only solves the technical problem in the existing membrane seawater desalination technology that it is difficult to make a real-time response according to the actual raw water pressure input at the front end and automatically adjust the subsequent membrane module matching method to adapt to the current raw water pressure. It also solves the technical problem that it is impossible to switch between the two completely different seawater membrane desalination processes of multi-stage cyclic and multi-stage continuous in general engineering applications.

[0060] In one embodiment, as Figure 1 、 Figures 7 to 13As shown in the figure, the membrane method seawater desalination system provided in the present invention further includes an energy recovery device 107. The energy recovery device 107 includes a water injection pipeline 1, a first power generation component 2, and a second power generation component 3. The first power generation component 2 includes an outer stator 2-1, an outer rotor 2-2, an outer bearing 2-3, an outer support column 2-4, and a paddle 2-5. The bottom of the inner ring of the outer bearing 2-3 is fixedly connected to the top of the outer support column 2-4. The outer rotor 2-2 is installed on the frame at the top of the inner ring of the outer bearing 2-3, and the outer stator 2-1 is installed on the frame at the top of the outer ring of the outer bearing 2-3. A plurality of vertically installed paddles 2-5 are fixedly installed circumferentially on the outer surface of the outer support column 2-4. The second power generation component 3 includes an inner stator 3-1, an inner rotor 3-2, an inner bearing 3-3, an inner support column 3-4, and blades 3-5. The bottom of the inner ring of the inner bearing 3-3 is fixedly connected to the top of the inner support column 3-4. The inner rotor 3-2 is installed on the frame at the top of the inner ring of the inner bearing 3-3, and the inner stator 3-1 is installed on the frame at the top of the outer ring of the inner bearing 3-3. A plurality of vertically installed blades 3-5 are fixedly installed circumferentially on the bottom side of the inner support column 3-4. The bottom of the outer support column 2-4 is higher than the top of the blades 3-5. The blades 3-5 are inclined at a preset angle, and the distance from the end of the blades 3-5 to the center of the inner support column 3-4 is not less than the distance from the end of the paddle 2-5 to the center of the outer support column 2-4. The inner bearing 3-3 is arranged inside the inner ring of the outer bearing 2-3. The water injection inlet of the water injection pipeline 1 is connected to the water outlet of the concentrated water collection container 103, and the water injection outlet of the water injection pipeline 1 is arranged opposite to the paddle 2-5.

[0061] It should be noted that the inner ring of the outer ring bearing 2-3 is rotatable. A frame for installing the outer ring rotor 2-2 is arranged at the top of the inner ring of the outer ring bearing 2-3, and the outer ring rotor 2-2 is installed on the frame at the top of the inner ring of the outer ring bearing 2-3. The top of the outer ring support column 2-4 is connected to the bottom of the inner ring of the outer ring bearing 2-3. Therefore, the outer ring support column 2-4 can rotate. The outer ring of the outer ring bearing 2-3 is fixed. A frame for installing the outer ring stator 2-1 is arranged at the top of the outer ring of the outer ring bearing 2-3, and the outer ring stator 2-1 is installed on the frame at the top of the outer ring bearing 2-3. Therefore, the outer ring rotor 2-2 and the outer ring stator 2-1 form a structure that can generate electricity by cutting magnetic induction lines by rotating the outer ring rotor 2-2 against the outer ring stator 2-1. The inner ring of the inner ring bearing 3-3 is rotatable. A frame for installing the inner ring rotor 3-2 is arranged at the top of the inner ring of the inner ring bearing 3-3, and the inner ring rotor 3-2 is installed on the frame at the top of the inner ring of the inner ring bearing 3-3. The top of the inner ring support column 3-4 is connected to the bottom of the inner ring of the inner ring bearing 3-3. Therefore, the inner ring support column 3-4 can rotate. The outer ring of the inner ring bearing 3-3 is fixed. A frame for installing the inner ring stator 3-1 is arranged at the top of the outer ring of the inner ring bearing 3-3, and the inner ring stator 3-1 is installed on the frame at the top of the inner ring bearing 3-3. Therefore, the inner ring rotor 3-2 and the inner ring stator 3-1 form a structure that can generate electricity by cutting magnetic induction lines by rotating the inner ring rotor 3-2 against the inner ring stator 3-1. The water jet outlet of the water jet pipe 1 is aligned with the paddle 2-5 of the first power generation assembly 2. The water ejected from the water jet outlet hits the paddle 2-5, providing a thrust for the paddle 2-5 to drive the outer ring support column 2-4 to rotate. The outer ring support column 2-4 drives the rotor on the inner ring of the outer ring bearing 2-3 to rotate, and performs a magnetic induction line cutting action on the outer ring stator 2-1 at the top of the outer ring of the outer ring bearing 2-3 to generate electricity. The paddle 2-5 can be set as an arc structure. The water hitting the paddle 2-5 drops onto the blade 3-5 of the second power generation assembly 3 under the action of gravity. Since the blade 3-5 is inclined at a preset angle, the water dropping onto the blade 3-5 will push the blade 3-5 to rotate horizontally, driving the inner ring support column 3-4 to rotate, and further driving the inner ring rotor 3-2 at the top of the inner ring of the inner ring bearing 3-3 to rotate, and performing a magnetic induction line cutting action on the inner ring stator 3-1 at the top of the outer ring of the inner ring bearing 3-3 to generate electricity. An energy recovery device 107 is provided to further generate hydraulic power from the concentrated water obtained by seawater desalination, improving the utilization efficiency of water resources and also improving the power generation efficiency.

[0062] In one embodiment, the preset angle is 15 degrees. The curves of the lift coefficient and drag coefficient of the blade 3-5 of the second power generation assembly 3 varying with the angle of attack obtained by software simulation are as Figure 9 shown. It can be seen that under general conditions, when the angle of attack is 15°, the difference between the lift coefficient and the drag coefficient is the largest, that is, as Figure 4As shown, when the angle of attack is 15 degrees inclined to the blade 3-5, when dropping from above the blade 3-5 onto the blade 3-5, the blade 3-5 can be best pushed to rotate.

[0063] In one embodiment, as Figure 8 and Figure 11 shown, the second power generation assembly 3 further includes a support baffle 3-6 and a support spring 3-7. The support baffle 3-6 and the support spring 3-7 are located between the bottom of the outer ring support 2-4 and the top of the blade 3-5. One end of the support spring 3-7 is fixedly connected to the bottom side of the support baffle 3-6 facing the inner ring support 3-4, the other end of the support spring 3-7 is fixedly connected to the side of the inner ring support 3-4, the top of the support baffle 3-6 is movably connected to the bottom of the outer ring support 2-4, specifically, it can be connected by a hinge. The bottom of the support baffle 3-6 is inclined outward in the vertical direction, and the distance from the outermost side of the support baffle 3-6 to the center of the inner ring support 3-4 is less than the distance from the end of the blade 3-5 to the center of the inner ring support 3-4. There are multiple support baffles 3-6 and support springs 3-7, and the multiple support baffles 3-6 and support springs 3-7 are arranged circumferentially around the inner ring support 3-4. When the amount of water ejected from the water ejection outlet is very large, the work done by the gravitational potential energy generated by the water flowing down from the deflector 2-5 acts on the support baffle 3-6. After the support baffle 3-6 is pressed, the connected support spring 3-7 is compressed, and the support baffle 3-6 moves towards the axis of the inner ring support 3-4. The cross-sectional area of the bottom through which water can pass increases. While ensuring pressure relief, it can also increase the contact area between the water flow and the bottom blade 3-5, thereby further enhancing the pushing effect on the blade 3-5 and accelerating the rotation of the bottom blade 3-5. When the amount of water ejected from the water ejection outlet decreases, the support baffle 3-6 returns to the normal position under the reset action of the support spring 3-7, and the cross-sectional area of the bottom through which water can pass decreases, which can increase the pressure of the water flow on the bottom and improve the thrust of the bottom blade 3-5. At the same time, at this time, the water flow contacts more with the outer edge of the blade 3-5 (i.e., away from the axis of the inner ring support 3-4). In the case of the same flow rate, at this time, more force applied to the outer edge of the blade 3-5 can cause a greater thrust on the blade 3-5 than on the inner edge, thereby ensuring the rotation speed of the blade 3-5, further ensuring the speed of the inner ring rotor 3-2, and thus ensuring the power generation efficiency.

[0064] In one embodiment, the dual-axis power generation device provided by the present invention further includes a pressure regulating device 4. The pressure regulating device 4 is installed on the water injection pipe 1 near the water injection outlet. The pressure regulating device 4 is used to regulate the water injection speed of the water injection outlet. By the pressure regulating device, the water injection speed of the water injection outlet can be regulated, thereby controlling the rotation speed of the outer ring rotor 2-2. As Figure 12As shown, the pressure regulating device 4 includes a water pipe support frame 4-1, a rotary motor 4-2, a lead screw 4-3, and an elastic blocking gasket 4-4. The water pipe support frame 4-1 is sleeved on the water jetting pipe 1. The output shaft of the rotary motor 4-2 is fixedly connected to one end of the lead screw 4-3. The other end of the lead screw 4-3 passes through the water pipe support frame 4-1 and the pipe wall of the water jetting pipe 1 and communicates with the inside of the water jetting pipe 1. An elastic blocking gasket 4-4 is fixedly connected to the end of the lead screw 4-3 that enters the inside of the water jetting pipe 1. When the water flow rate in the water jetting pipe 1 is small, the rotary motor 4-2 controls the lead screw 4-3 to rotate forward, and the lead screw 4-3 moves into the water jetting pipe 1. At this time, the elastic blocking gasket 4-4 moves into the water jetting pipe 1, and the cross-sectional area on the side of the water jetting pipe 1 close to the rotary motor 4-2 decreases. The pipe on the side far from the rotary motor 4-2 is not occupied. Then, the water flow in the water jetting pipe 1 will more contact the outer edge of the paddle 2-5, pushing the outer edge of the paddle 2-5 to rotate. Compared with pushing the inner edge of the paddle 2-5, the force arm increases, thereby increasing the torque on the entire outer rotor 2-2 and increasing the rotational speed of the outer rotor 2-2. When the water flow rate in the water jetting pipe 1 is large, the rotary motor 4-2 controls the lead screw 4-3 to rotate reversely, and the lead screw 4-3 moves to the outside of the water jetting pipe 1. The cross-sectional area on the side of the water jetting pipe 1 close to the rotary motor 4-2 increases. Since the elastic blocking gasket 4-4 is flexible, when the cross-sectional area on the side of the water jetting pipe 1 close to the rotary motor 4-2 is the largest, the entire elastic blocking gasket 4-4 can completely fit the inner wall of the water jetting pipe 1, and then the entire water jetting pipe 1 is completely opened. At this time, the water flow in the water jetting pipe 1 can pass through more smoothly and stably. In a specific application scenario, the lead screw 4-3 extends into the water jetting pipe 1 from the pipe wall of the water jetting pipe 1 facing the paddle 2-5, so that in the state where the entire water jetting pipe 1 is completely opened and the state where the elastic blocking gasket 4-4 moves into the water jetting pipe 1, the water ejected from the water jet outlet can impact the outer edge of the paddle 2-5, increasing the torque on the outer rotor 2-2, and thus increasing the rotational speed of the outer rotor 2-2.

[0065] In one embodiment, as Figure 8 shown, there are multiple outer rotors 2-2, and the multiple outer rotors 2-2 are circumferentially distributed at equal intervals on the top of the inner ring of the outer bearing 2-3. There are multiple outer stators 2-1, and the multiple outer stators 2-1 are circumferentially distributed at equal intervals on the top of the outer ring of the outer bearing 2-3, improving the power generation efficiency of the first power generation assembly 2. There are multiple inner rotors 3-2, and the multiple inner rotors 3-2 are circumferentially distributed at equal intervals on the top of the inner ring of the inner bearing 3-3. There are multiple inner stators 3-1, and the multiple inner stators 3-1 are circumferentially distributed at equal intervals on the top of the outer ring of the inner bearing 3-3, improving the power generation efficiency of the second power generation assembly 3.

[0066] In one embodiment, as Figure 13As shown in the figure, the dual-axis power generation device provided by the present invention further includes a detachable housing 5, and the water jet outlet of the water jet pipe 1, the first power generation assembly 2, and the second power generation assembly 3 are arranged inside the detachable housing 5. The detachable housing 5 is provided to protect the first power generation assembly 2 and the second power generation assembly 3 of the dual-axis power generation device, avoiding damage to the internal components of the dual-axis power generation device caused by external factors. The frame at the top of the outer ring of the outer ring bearing 2-3 of the first power generation assembly 2 can be connected and fixed to the frame at the top of the inner ring of the inner ring bearing 3-3 of the second power generation assembly 3 through a connecting component. The bottom of the outer column 2-4 of the first power generation assembly 2 is suspended. The bottom of the inner column 3-4 of the second power generation assembly 3 can be movably connected to the inner bottom of the detachable housing 5 through a movable connecting piece.

[0067] In one embodiment, it further includes a water recovery device, which is installed below the second power generation assembly 3 and is used to collect the water that falls below the second power generation assembly 3, realizing the collection of the water used for power generation.

[0068] The terms "first", "second", etc. in the specification of the present invention are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0069] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A membrane method seawater desalination system, characterized in that, It includes a primary reverse osmosis membrane array, a final reverse osmosis membrane array, a fresh water collection container, a concentrated water collection container, and several electric control switches; Both the primary reverse osmosis membrane array and the final reverse osmosis membrane array include multiple reverse osmosis membrane modules. The multiple reverse osmosis membrane modules are arranged in a preset matrix manner. The input ends of each reverse osmosis membrane module in the primary reverse osmosis membrane array are commonly connected to the same raw water outlet through their respective input pipes. An electric control switch is configured at the output end of each reverse osmosis membrane module in the primary reverse osmosis membrane array. The output ends of each reverse osmosis membrane module in the primary reverse osmosis membrane array are commonly connected to the inlet of the first common output pipe through the first connection pipe after passing through the electric control switch. The number of rows and columns of the preset matrix is not less than 2; The input ends of each reverse osmosis membrane module in the final reverse osmosis membrane array are commonly connected to the outlet of the first common output pipe through their respective input pipes. An electric control switch is configured at the output end of each reverse osmosis membrane module in the final reverse osmosis membrane array. The output ends of each reverse osmosis membrane module in the final reverse osmosis membrane array are commonly connected to the inlet of the second common output pipe through the second connection pipe after passing through the electric control switch; Fresh water output pipes and concentrated water output pipes are respectively configured at the output ends of each reverse osmosis membrane module in the primary reverse osmosis membrane array and the final reverse osmosis membrane array. Electric control switches are configured on both the fresh water output pipes and the concentrated water output pipes. The fresh water output pipes are connected to the fresh water collection container, and the concentrated water output pipes are connected to the concentrated water collection container.

2. The membrane method seawater desalination system according to claim 1, characterized in that, It further includes at least one intermediate reverse osmosis membrane array. The structure of the intermediate reverse osmosis membrane array is the same as that of the primary reverse osmosis membrane array. The intermediate reverse osmosis membrane array is connected between the primary reverse osmosis membrane array and the final reverse osmosis membrane array. And when there are no less than 2 intermediate reverse osmosis membrane arrays, they are connected between the primary reverse osmosis membrane array and the final reverse osmosis membrane array in a sequentially series-connected manner.

3. The membrane method seawater desalination system according to claim 2, characterized in that, Two electric control switches are configured on the connection pipe of each reverse osmosis membrane module that is connected to the fresh water collection container. The two electric control switches are connected to the inlet of the next-level reverse osmosis membrane array through an intermediate pipe configured with an electric control switch.

4. The membrane seawater desalination system according to claim 2, characterized in that, It further includes an energy storage and energy release system; The energy storage and energy release system includes an energy storage tank group, an energy release tank group, and a reserve tank group. Each tank in the energy storage tank group, the energy release tank group, and the reserve tank group is configured with an input switch and an output switch. The energy storage tank group, the energy release tank group, and the reserve tank group are respectively configured with a seawater input main switch and a seawater output main switch. The seawater input main switches of the energy storage tank group, the energy release tank group, and the reserve tank group are commonly connected to the energy storage main switch. The seawater output main switches of the energy storage tank group, the energy release tank group, and the reserve tank group are commonly connected to the energy release main switch. The energy release main switch is connected to the raw water outlet.

5. The membrane seawater desalination system according to claim 4, characterized in that, It further includes a pressure gauge, which is installed at the rear end of the energy release main switch and is used to measure the pressure at the rear end of the energy release main switch.

6. The membrane seawater desalination system according to claim 5, wherein It further includes a controller; The controller is electrically connected to all the electric control switches, the seawater input main switch, the seawater output main switch, the energy storage main switch, the energy release main switch, and the pressure gauge respectively; The controller is used to control the opening and closing states of all electric control switches according to the back-end pressure of the energy release main switch, so as to control the series-parallel states of the primary reverse osmosis membrane array, the intermediate stage of the reverse osmosis membrane array, and the final stage of the reverse osmosis membrane array, so that when the back-end pressure of the energy release main switch is greater than the preset pressure, the primary multi-stage cyclic seawater desalination mode is adopted for seawater desalination, and when the back-end pressure of the energy release main switch is not greater than the preset pressure, the primary multi-stage continuous seawater desalination mode is adopted for seawater desalination; The primary multi-stage cyclic seawater desalination mode is to collect the concentrated water generated after desalinating the raw water, and the generated fresh water is sent to the next stage for desalination; The primary multi-stage continuous seawater desalination mode is to collect the fresh water generated after desalinating the raw water, and the generated concentrated water is sent to the next stage for desalination.

7. The membrane method seawater desalination system according to claim 6, characterized in that, When the back-end pressure of the energy release main switch is less than 6 MPa, the controller determines whether the back-end pressure of the energy release main switch is greater than 3 MPa. If so, it further determines whether the back-end pressure of the energy release main switch is greater than 5 MPa. If it is greater than 5 MPa, the primary multi-stage cyclic seawater desalination mode is adopted for seawater desalination. If it is not greater than 5 MPa, the primary multi-stage continuous seawater desalination mode is adopted for seawater desalination. If the back-end pressure of the energy release main switch is not greater than 3 MPa, the output switches of the unopened energy release tanks are opened one by one. After each output switch of an unopened energy release tank is opened, a judgment operation is performed on whether the back-end pressure of the energy release main switch is greater than 3 MPa; When the back-end pressure of the energy release main switch is not less than 6 MPa, the controller closes the output switches of the opened energy release tanks one by one. After each output switch of an opened energy release tank is closed, a judgment operation is performed on whether the back-end pressure of the energy release main switch is greater than 3 MPa.

8. The membrane seawater desalination system according to any one of claims 1-7, characterized in that, It also includes an energy recovery device; The energy recovery device includes a water injection pipeline, a first power generation component, and a second power generation component; The first power generation component includes an outer stator, an outer rotor, an outer bearing, an outer support column, and a paddle. The inner bottom of the outer bearing is fixedly connected to the top of the outer support column. The outer rotor is installed on the frame at the top of the inner ring of the outer bearing, and the outer stator is installed on the frame at the top of the outer ring of the outer bearing. A plurality of vertically installed paddles are fixedly installed on the outer surface of the outer support column in the circumferential direction; The second power generation component includes an inner stator, an inner rotor, an inner bearing, an inner support column, and blades. The inner bottom of the inner bearing is fixedly connected to the top of the inner support column. The inner rotor is installed on the frame at the top of the inner ring of the inner bearing, and the inner stator is installed on the frame at the top of the outer ring of the inner bearing. A plurality of vertically installed blades are fixedly installed on the bottom side of the inner support column in the circumferential direction. The bottom of the outer support column is higher than the top of the blades. The blades are inclined at a preset angle, and the distance from the end of the blade to the center of the inner support column is not less than the distance from the end of the paddle to the center of the outer support column. The inner bearing is arranged inside the inner ring of the outer bearing; The water injection inlet of the water injection pipeline is connected to the water outlet of the concentrated water collection container, and the water injection outlet of the water injection pipeline is arranged opposite to the paddle.

9. The membrane seawater desalination system according to claim 8, characterized in that The second power generation component also includes a support baffle and a support spring; The supporting baffle and the supporting spring are located between the bottom of the outer ring strut and the top of the blade. One end of the supporting spring is fixedly connected to the bottom side of the supporting baffle facing the inner ring strut, and the other end of the supporting spring is fixedly connected to the side of the inner ring strut. The top of the supporting baffle is movably connected to the bottom of the outer ring strut. The bottom of the supporting baffle is inclined outward in the vertical direction. The distance from the outermost side of the supporting baffle to the center of the inner ring strut is less than the distance from the end of the blade to the center of the inner ring strut.

10. The membrane seawater desalination system according to claim 8, characterized in that, There are multiple supporting baffles and supporting springs, and the multiple supporting baffles and supporting springs are arranged circumferentially around the inner ring strut.

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