A membrane seawater desalination system

Abstract

The present invention discloses a membrane seawater desalination system, comprising 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 electrically controlled switches. The first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array both comprise a plurality of reverse osmosis membrane modules, which are arranged in a preset matrix manner. The output end of each reverse osmosis membrane module is respectively provided with a fresh water output pipe and a concentrated water output pipe, each of which is provided with an electrically controlled switch. By controlling the opening and closing of the electrically controlled switches, the reverse osmosis membrane modules can be connected in series or in parallel to meet the demand for rapid fresh water production according to the application scenario, and the fresh water collection container and the concentrated water collection container are provided to respectively collect the fresh water and concentrated water generated in the process of seawater desalination, thereby solving the technical problem that the existing membrane seawater desalination method is difficult to obtain high-purity fresh water and high seawater desalination efficiency according to actual production needs.

Description

Technical Field

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

[0002] Membrane desalination utilizes the principle of osmotic pressure. When a membrane separates freshwater and seawater, under normal circumstances, water molecules in the freshwater will permeate toward the seawater side due to osmotic pressure. However, when pressure greater than the osmotic pressure is applied to the seawater side, water molecules in the seawater are forced through the membrane to permeate toward the freshwater side. However, the ions generated by the salt in the seawater, due to their larger size, cannot pass through the membrane, thus separating the water and salt molecules and producing freshwater.

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

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

[0005] In view of this, the present invention provides a membrane seawater desalination system, comprising 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 electrically controlled switches;

[0006] The first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array each include a plurality of reverse osmosis membrane modules, which are arranged in a preset matrix. The input end of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array is commonly connected to the same raw water output port through its own input pipe. The output end of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array is configured with an electronically controlled switch. The output end of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array is commonly connected to the inlet of the first common output pipe through a first connecting pipe after passing through the electronically controlled switch. 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 of the final reverse osmosis membrane array is commonly connected to the outlet of the first common output pipeline through its own input pipeline, the output end of each reverse osmosis membrane module of the final reverse osmosis membrane array is configured with an electric control switch, and the output end of each reverse osmosis membrane module of the final reverse osmosis membrane array is commonly connected to the inlet of the second common output pipeline through the second connecting pipeline after passing through the electric control switch;

[0008] The output ends of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array are respectively equipped with a fresh water output pipe and a concentrated water output pipe. Both the fresh water output pipe and the concentrated water output pipe are equipped with electric control switches. The fresh water output pipe is connected to the fresh water collection container, and the concentrated water output pipe is connected to the concentrated water collection container.

[0009] Optionally, it also includes at least one intermediate-stage reverse osmosis membrane array, the structure of the intermediate-stage reverse osmosis membrane array is the same as that of the first-stage reverse osmosis membrane array, the intermediate-stage reverse osmosis membrane array is connected between the first-stage reverse osmosis membrane array and the last-stage reverse osmosis membrane array, and when there are no less than two intermediate-stage reverse osmosis membrane arrays, they are connected in series between the first-stage reverse osmosis membrane array and the last-stage reverse osmosis membrane array.

[0010] Optionally, two electric switches are provided on the communication pipe of each reverse osmosis membrane module communicating with the fresh water collection container, and the two electric switches are connected to the inlet of the next stage reverse osmosis membrane array via an intermediate pipe equipped with an electric switch.

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

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

[0013] Optionally, a pressure measuring instrument is further included, which is installed at the rear end of the energy release main switch and is used to measure the rear end pressure of the energy release main switch.

[0014] Optionally, a controller is further included;

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

[0016] The controller is used to control the opening and closing states of all the electric control switches according to the rear end pressure of the energy release master switch to control the series and parallel states of the first-stage reverse osmosis membrane array, the intermediate stage of the reverse osmosis membrane array, and the final stage reverse osmosis membrane array, so that when the rear end pressure of the energy release master switch is greater than a preset pressure, the first-stage reverse osmosis membrane array, the intermediate stage of the reverse osmosis membrane array, and the final stage reverse osmosis membrane array adopt a first-stage multi-stage circulating seawater desalination mode to desalinate seawater, and when the rear end pressure of the energy release master switch is not greater than the preset pressure, the first-stage multi-stage continuous seawater desalination mode is adopted to desalinate seawater;

[0017] The first-stage multi-stage circulating seawater desalination mode is to collect the concentrated water produced after the raw water is desalinated, and the produced fresh water is desalinated in the next stage;

[0018] The one-stage multi-stage continuous seawater desalination mode collects the fresh water produced after the raw water is desalinated, and the concentrated water produced is desalinated in the next stage.

[0019] Optionally, when the rear end pressure of the energy release main switch is less than 6 MPa, the controller determines whether the rear end pressure of the energy release main switch is greater than 3 MPa. If so, the controller further determines whether the rear end pressure of the energy release main switch is greater than 5 MPa. If it is greater than 5 MPa, a one-stage multi-stage circulating seawater desalination mode is adopted for seawater desalination. If it is not greater than 5 MPa, a one-stage multi-stage continuous seawater desalination mode is adopted for seawater desalination. If the rear 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 determination operation is performed to determine whether the rear end pressure of the energy release main switch is greater than 3 MPa.

[0020] When the pressure at the rear end of the energy release main switch is not less than 6MPa, the controller closes the output switches of the opened energy release tanks one by one. After closing the output switch of each opened energy release tank, the controller performs a judgment operation to determine whether the pressure at the rear end of the energy release main switch is greater than 3MPa.

[0021] Optionally, it also includes a residual energy recovery device;

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

[0023] The first power generation assembly includes an outer ring stator, an outer ring rotor, an outer ring bearing, an outer ring support, and a paddle. The bottom of the inner ring of the outer ring bearing is fixedly connected to the top of the outer ring support. The outer ring rotor is mounted on the frame at the top of the inner ring of the outer ring bearing. The outer ring stator is mounted on the frame at the top of the outer ring of the outer ring bearing. A plurality of vertically mounted paddles are fixedly mounted on the outer surface of the outer ring support in a circumferential direction.

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

[0025] Optionally, the second power generation assembly 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 pillar 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 pillar, the other end of the support spring is fixedly connected to the side of the inner ring pillar, the top of the support baffle is movably connected to the bottom of the outer ring pillar, the bottom of the support baffle is inclined outward in the vertical direction, and the distance from the outermost side of the support baffle to the center of the inner ring pillar is smaller than the distance from the end of the blade to the center of the inner ring pillar.

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

[0028] From the above technical solutions, it can be seen that the membrane seawater desalination system provided by the present invention has the following advantages:

[0029] The membrane desalination system provided by the present invention includes 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 several electrically controlled switches. The first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array both include multiple reverse osmosis membrane modules, which are arranged in a preset matrix manner. The output end of each reverse osmosis membrane module is respectively provided with a fresh water output pipe and a concentrated water output pipe, and the fresh water output pipe and the concentrated water output pipe are both provided with electrically controlled switches. By controlling the opening and closing of the electrically controlled switches, series and parallel connection between the reverse osmosis membrane modules can be achieved according to actual application scenarios. In situations where the pressure energy release is large, the reverse osmosis membrane modules are connected in parallel to achieve rapid fresh water production. In situations where the pressure energy release is small, the reverse osmosis membrane modules are connected in series to achieve rapid fresh water production. At the same time, a fresh water collection container and a concentrated water collection container are provided to respectively collect the fresh water and concentrated water generated by the reverse osmosis membrane modules during the seawater desalination process. This solves the technical problem that the existing membrane desalination method is difficult to obtain high-purity fresh water and high seawater desalination efficiency according to actual production needs.

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

[0031] The membrane seawater desalination system provided by the present invention has a pressure regulating device installed on the water jet pipe near the water jet outlet. The water jet speed of the water jet outlet can be adjusted by pressure regulation, thereby controlling the rotation speed of the outer ring rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

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

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

[0035] Figure 3 for Figure 2 Right view of the reverse osmosis membrane array in;

[0036] Figure 4 Schematic diagram of the pipeline connections of the one-stage multi-stage circulating seawater desalination mode and the one-stage multi-stage continuous seawater desalination mode provided in an embodiment of the present invention;

[0037] Figure 5 A schematic structural diagram of an energy storage and release system provided in an embodiment of the present invention;

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

[0039] Figure 7 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 This is a schematic structural diagram of a first power generation component and a second power generation component provided in an embodiment of the present invention;

[0041] Figure 9 A schematic diagram of a curve showing changes in lift coefficient and drag coefficient of a blade of a second power generation assembly as a function of attack angle provided in an embodiment of the present invention;

[0042] Figure 10 Schematic diagram of the angle of attack between the blades of the second power generation assembly and the direction of water flow provided in an embodiment of the present invention;

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

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

[0045] Figure 13A schematic structural diagram of a detachable housing provided in an embodiment of the present invention;

[0046] Wherein, the accompanying drawings are marked as follows:

[0047] 100. First-stage reverse osmosis membrane array; 101. Final-stage reverse osmosis membrane array; 102. Fresh water collection container; 103. Concentrated water collection container; 104. Electric control switch; 105. Intermediate-stage reverse osmosis membrane array; 106. Reverse osmosis membrane module; 107. Residual energy recovery device; 1. Water jet pipeline; 2. First power generation component; 2-1. Outer ring stator; 2-2. Outer ring rotor; 2-3. Outer ring bearing; 2-4. Outer ring support; 2-5. Paddle; 3. Second power generation component; 3-1. Inner ring stator; 3-2. Inner ring rotor; 3-3. Inner ring bearing; 3-4. Inner ring support; 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. Screw rod; 4-4. Elastic blocking gasket; 5. Removable housing; G1. Energy release tank group; G2. Reserve tank group; G3. Energy storage tank group; S1. Input switch; S2. Output switch; S3. Seawater input main switch; S4. Seawater output main switch; S5. Energy storage main switch; S6. Energy release main switch; T1. Pressure measuring instrument; W1. First connecting pipe; W11. First common output pipe; W2. Second connecting pipe; W22. Second common output pipe. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0049] For easier understanding, see Figures 1 to 3 The present invention provides an embodiment of a membrane seawater desalination system, comprising a first-stage reverse osmosis membrane array 100, a final-stage reverse osmosis membrane array 101, a fresh water collection container 102, a concentrated water collection container 103, and a plurality of electronically controlled switches 104;

[0050] The first-stage reverse osmosis membrane array 100 and the final-stage reverse osmosis membrane array 101 each include a plurality of reverse osmosis membrane modules 106, which are arranged in a preset matrix. The input end of each reverse osmosis membrane module 106 of the first-stage reverse osmosis membrane array 100 is commonly connected to the same raw water output port through its own input pipe. The output end of each reverse osmosis membrane module 106 of the first-stage reverse osmosis membrane array 100 is configured with an electronically controlled switch 104. After passing through the electronically controlled switch 104, the output end of each reverse osmosis membrane module 106 of the first-stage reverse osmosis membrane array 100 is commonly connected to the inlet of the first common output pipe W11 through the first connecting pipe W1. The number of rows and columns of the preset matrix is not less than 2.

[0051] The input end of each reverse osmosis membrane module 106 of the final reverse osmosis membrane array 101 is commonly connected to the outlet of the first common output pipe W11 through its own input pipe, and the output end of each reverse osmosis membrane module 106 of the final reverse osmosis membrane array 101 is configured with an electric control switch 104. The output end of each reverse osmosis membrane module 106 of the final reverse osmosis membrane array 101 is commonly connected to the inlet of the second common output pipe W22 through the second connecting pipe W2 after passing through the electric control switch 104;

[0052] The output ends of each reverse osmosis membrane module 106 of the first-stage reverse osmosis membrane array 100 and the final-stage reverse osmosis membrane array 101 are respectively equipped with a fresh water output pipe and a concentrated water output pipe, and both the fresh water output pipe and the concentrated water output pipe are equipped with an electric control switch 104. The fresh water output pipe is connected to the fresh water collection container 102, and the concentrated water output pipe is 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 desalination. The concentrated water is connected to the concentrated water collection container 103 through a concentrated water output pipe equipped with an electric control switch 104, and the fresh water is connected to the fresh water collection container 102 through a fresh water pipe equipped with an electric control switch 104. The electric control switch 104 is used to control the connection state of the pipe by opening and closing the state. At the same time, the series-parallel relationship between each reverse osmosis membrane module 106 can be realized through the electric control switch 104 between each reverse osmosis membrane module 106. When the seawater desalination process belongs to the occasion where the pressure energy release is large (>6MPa), the reverse osmosis membrane modules 106 are connected in parallel. When the seawater desalination process belongs to the occasion where the pressure energy release is small (<6MPa), the reverse osmosis membrane modules 106 are connected in series. Figure 3 As shown, when all the electric control switches 104 on a certain reverse osmosis membrane array cross section are turned on, only all the reverse osmosis membrane modules 106 on the cross section are utilized ( Figure 3Seawater desalination is typically performed using nine reverse osmosis membrane modules 106 arranged in a 3×3 pattern. This is typically used in applications where pressure release is low but freshwater production is desired as quickly as possible. When the desalination process requires high pressure release and rapid freshwater production, the electronically controlled switches 104 of subsequent sections can be opened, connecting the reverse osmosis membrane modules 106 in the subsequent section in series to the reverse osmosis membrane modules 106 in the previous section.

[0054] The membrane desalination system provided by the present invention includes a first-stage reverse osmosis membrane array 100, a final-stage reverse osmosis membrane array 101, a fresh water collection container 102, a concentrated water collection container 103, and a plurality of electronically controlled switches 104. The first-stage reverse osmosis membrane array 100 and the final-stage reverse osmosis membrane array 101 each include a plurality of reverse osmosis membrane modules 106. The plurality of reverse osmosis membrane modules 106 are arranged in a preset matrix. The output end of each reverse osmosis membrane module 106 is respectively equipped with a fresh water output pipe and a concentrated water output pipe. The fresh water output pipe and the concentrated water output pipe are both equipped with an electronically controlled switch 104. By controlling the electronically controlled switch 104, the fresh water output pipe and the concentrated water output pipe are respectively equipped with an electronically controlled switch 104. The opening and closing of the reverse osmosis membrane modules 106 can be realized in series and parallel according to the actual application scenario. When the pressure energy is released greatly, the reverse osmosis membrane modules 106 are connected in parallel to achieve rapid production of fresh water. When the pressure energy is released little, the reverse osmosis membrane modules 106 are connected in series to achieve rapid production of fresh water. At the same time, a fresh water collection container 102 and a concentrated water collection container 103 are configured to respectively collect the fresh water and concentrated water generated by the reverse osmosis membrane module 106 in the process of seawater desalination, thereby solving the technical problem that the existing membrane seawater desalination method is difficult to adapt to the demand for rapid production of fresh water according to the actual seawater pressure.

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

[0056] In one embodiment, Figure 2 As shown, the membrane desalination system provided by the present invention also includes at least one intermediate reverse osmosis membrane array 105. The structure of the intermediate reverse osmosis membrane array 105 is the same as that of the first-stage reverse osmosis membrane array 100. The intermediate reverse osmosis membrane array 105 is connected between the first-stage reverse osmosis membrane array 100 and the final-stage reverse osmosis membrane array 101. When there are at least two intermediate reverse osmosis membrane arrays 105, they are connected in series between the first-stage reverse osmosis membrane array 100 and the final-stage reverse osmosis membrane array 101. Figure 2 and Figure 3 For example, Figure 2 The right side view of the first stage reverse osmosis membrane array 100, the final stage reverse osmosis membrane array 101 and the intermediate stage reverse osmosis membrane array 105 is shown in FIG. Figure 3Similarly, when the electronically controlled switches 104 at coordinate points (1, 1, 1), (2, 1, 1), (3, 1, 1), and (4, 1, 1) are turned on and the electronically controlled switches 104 at other locations are turned off, a series connection is achieved along the pathways (1, 1, 1), (2, 1, 1), (3, 1, 1), and (4, 1, 1). When all electronically controlled switches 104 located in the fourth column, i.e., on the section where the x-axis equals 4, are simultaneously turned on, a parallel connection is achieved for the desalination pathways. By cascading at least one intermediate reverse osmosis membrane array 105 between the first-stage reverse osmosis membrane array 100 and the final-stage reverse osmosis membrane array 101, a multi-stage desalination mode can be further formed, further producing purer fresh water and more concentrated seawater.

[0057] In one embodiment, each reverse osmosis membrane module 106 is equipped with two electrically controlled switches 104 on the connecting pipe connecting to the fresh water collection container 102. An intermediate pipe equipped with an electrically controlled switch 104 connects the two electrically controlled switches 104 to the inlet of the next-stage reverse osmosis membrane array. All electrically controlled switches 104 are connected to a controller, which is used to control the opening and closing states of all electrically controlled switches 104 based on the input pressure of the first-stage reverse osmosis membrane array 100. When the input pressure of the first-stage reverse osmosis membrane array 100 exceeds a preset pressure, the membrane desalination system uses a single-stage multi-stage circulating desalination mode to desalinate seawater to obtain fresh water of higher purity. When the input pressure of the first-stage reverse osmosis membrane array 100 is not greater than the preset pressure, the membrane desalination system uses a single-stage multi-stage continuous desalination mode to desalinate seawater to achieve the highest possible desalination efficiency under low pressure conditions. The single-stage multi-stage circulating desalination mode collects the concentrated water produced after desalination of the raw water, and the resulting fresh water is then used for the next stage of desalination. The one-stage multi-stage continuous seawater desalination mode is to collect the fresh water produced after the raw water is desalinated, and the concentrated water produced is desalinated in the next stage. Figure 4 As shown, when the electronically controlled switches 104#1, #2, and #4 are turned on (correspondingly, #6, #7, and #8 are turned on), and #3 and #5 are turned off (correspondingly, #9 and #10 are turned off), the membrane desalination system is in a one-stage multi-stage continuous desalination mode; when the electronically controlled switches 104#1, #3, and #5 are turned on (correspondingly, #6, #8, and #10 are turned on), and #2 and #4 are turned off (correspondingly, #7 and #9 are turned off), the membrane desalination system is in a one-stage multi-stage circulating desalination mode.

[0058] In one embodiment, the membrane desalination system provided in the present invention further includes an energy storage and release system. Figure 5As shown, the energy storage and discharge system includes an energy storage tank group G3, an energy discharge tank group G1, and a reserve tank group G2. Each tank in the energy storage tank group G3, the energy discharge 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 discharge tank group G1, and the reserve tank group G2 are respectively equipped with a seawater input master switch S3 and a seawater output master switch S4. The seawater input master switches S3 of the energy storage tank group G3, the energy discharge tank group G1, and the reserve tank group G2 are connected to the energy storage master switch S5. The seawater output master switches S4 of the energy storage tank group G3, the energy discharge tank group G1, and the reserve tank group G2 are connected to the energy discharge master switch S6. The energy discharge master switch S6 is connected to the raw water output port. Specifically, as shown in FIG. Figure 5 As shown, the energy storage tank group G3, the energy discharge tank group G1, and the reserve tank group G2 can each consist of 10 tanks. Initially, the energy storage tank group G3, the energy discharge tank group G1, and the reserve tank group G2 are all filled with seawater. Then, the output switch S2 of one group is turned on, and that group becomes the energy discharge group. The remaining two groups are the reserve tank group G2 and the energy storage tank group G3. When the energy discharge tank group G1 is almost discharged, its seawater output master switch S4 is turned off, turning it into the energy storage group. At this point, the reserve tank group G2 becomes the energy discharge tank group G1, and the energy storage tank group G3 becomes the reserve tank group G2. And so on.

[0059] A pressure measuring instrument T1 is installed at the rear end of the energy release master switch S6, and the pressure measuring instrument T1 is used to measure the rear end pressure of the energy release master switch S6. The controller is electrically connected to all the electronically controlled switches, the seawater input master switch S3, the seawater output master switch S4, the energy storage master switch S5, the energy release master switch S6 and the pressure measuring instrument T1 respectively. The controller is used to control the opening and closing states of all the electronically controlled switches according to the rear end pressure of the energy release master switch S6 to control the series and parallel states of the first-stage reverse osmosis membrane array, the intermediate stage of the reverse osmosis membrane array and the final stage reverse osmosis membrane array, so that when the rear end pressure of the energy release master switch S6 is greater than the preset pressure, the first-stage reverse osmosis membrane array, the intermediate stage of the reverse osmosis membrane array and the final stage reverse osmosis membrane array adopt a first-stage multi-stage circulating seawater desalination mode for seawater desalination, and when the rear end pressure of the energy release master switch S6 is not greater than the preset pressure, a first-stage multi-stage continuous seawater desalination mode is adopted for seawater desalination. Specifically, as Figure 6As shown, when the pressure at the rear end of the energy release switch S6 is less than 6 MPa, the controller determines whether the pressure at the rear end of the energy release switch S6 is greater than 3 MPa. If so, the controller further determines whether the pressure at the rear end of the energy release switch S6 is greater than 5 MPa. If it is greater than 5 MPa, desalination is performed using a one-stage multi-stage circulating desalination mode. If it is not greater than 5 MPa, desalination is performed using a one-stage multi-stage continuous desalination mode. If the pressure at the rear end of the energy release switch S6 is not greater than 3 MPa, the controller opens the output switches S2 of the unopened energy release tanks one by one. After each unopened energy release tank output switch S2 is opened, the controller determines whether the pressure at the rear end of the energy release switch S6 is greater than 3 MPa. When the pressure at the rear end of the energy release switch S6 is not less than 6 MPa, the controller closes the output switches S2 of the opened energy release tanks one by one. After each opened energy release tank output switch S2, the controller determines whether the pressure at the rear end of the energy release switch S6 is greater than 3 MPa. This not only solves the technical problem of existing membrane desalination technology, which has difficulty responding to the actual raw water pressure input from the front end in real time and automatically adjusting the subsequent membrane module configuration to adapt to the current raw water pressure, but also solves the technical problem of being unable to switch between the two distinct seawater membrane desalination processes, multi-stage circulation and multi-stage continuous, in general engineering applications.

[0060] In one embodiment, Figure 1 、 Figures 7 to 13As shown, the membrane desalination system provided in the present invention also includes a surplus energy recovery device 107, which includes a water jet pipe 1, a first power generation assembly 2, and a second power generation assembly 3. The first power generation assembly 2 includes an outer ring stator 2-1, an outer ring rotor 2-2, an outer ring bearing 2-3, an outer ring support 2-4, and a paddle 2-5. The bottom of the inner ring of the outer ring bearing 2-3 is fixedly connected to the top of the outer ring support 2-4. The outer ring rotor 2-2 is mounted on the frame at the top of the inner ring of the outer ring bearing 2-3. The outer ring stator 2-1 is mounted on the frame at the top of the outer ring of the outer ring bearing 2-3. A plurality of vertically mounted paddles 2-5 are fixedly mounted circumferentially on the outer surface of the outer ring support 2-4. The second power generation assembly 3 includes an inner ring stator 3-1, an inner ring rotor 3-2, an inner ring bearing 3-3, an inner ring support 3-4, and blades 3-5. The inner ring bottom of the inner ring bearing 3-3 is fixedly connected to the top of the inner ring support 3-4. The inner ring rotor 3-2 is mounted on the frame at the top of the inner ring of the inner ring bearing 3-3, and the inner ring stator 3-1 is mounted on the frame at the top of the outer ring of the inner ring bearing 3-3. Several vertically mounted blades 3-5 are fixedly mounted circumferentially on the bottom side of the inner ring support 3-4. The bottom of the outer ring support 2-4 is higher than the top of the blades 3-5. The blades 3-5 are tilted at a preset angle, and the distance from the end of the blade 3-5 to the center of the inner ring support 3-4 is no less than the distance from the end of the paddle 2-5 to the center of the outer ring support 2-4. The inner ring bearing 3-3 is located on the inner side of the inner ring of the outer ring bearing 2-3. The water inlet of the water jet pipe 1 is connected to the outlet of the concentrated water collection container 103, and the water jet outlet of the water jet pipe 1 is aligned with 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 mounting the outer ring rotor 2-2 is located at the top of the inner ring of the outer ring bearing 2-3. The top of the outer ring support 2-4 is connected to the bottom of the inner ring of the outer ring bearing 2-3, allowing the outer ring support 2-4 to rotate. The outer ring of the outer ring bearing 2-3 is stationary. A frame for mounting the outer ring stator 2-1 is located at the top of the outer ring bearing 2-3. Thus, the outer ring rotor 2-2 and outer ring stator 2-1 form a structure that allows the outer ring rotor 2-2 to rotate and generate electricity by cutting the magnetic flux lines of the outer ring stator 2-1. The inner ring of the inner ring bearing 3-3 is rotatable. A frame for mounting the inner ring rotor 3-2 is located at the top of the inner ring bearing 3-3. The inner ring support 3-4 is connected at its top to the bottom of the inner ring bearing 3-3, allowing it to rotate. The outer ring of the inner ring bearing 3-3 is stationary. A frame for mounting the inner ring stator 3-1 is located at its top. The inner ring stator 3-1 is mounted on the frame at the top of the inner ring bearing 3-3. Thus, the inner ring rotor 3-2 and inner ring stator 3-1 form a structure that allows the inner ring rotor 3-2 to rotate and generate electricity by cutting the magnetic flux lines of the inner ring stator 3-1. The jet outlet of the water jet pipe 1 is aligned with the paddle 2-5 of the first power generation assembly 2. Water ejected from the jet outlet strikes the paddle 2-5, providing the thrust that drives the paddle 2-5 to rotate the outer ring support 2-4. This in turn drives the rotor on the inner ring of the outer ring bearing 2-3, cutting the magnetic flux lines of 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 configured as an arc. The water hitting the paddle 2-5 falls under the influence of gravity onto the blades 3-5 of the second power generation assembly 3. Because the blades 3-5 are tilted at a preset angle, the water falling on the blades 3-5 pushes the blades 3-5 to rotate horizontally, driving the inner ring support 3-4 to rotate. This in turn drives the inner ring rotor 3-2 at the top of the inner ring of the inner ring bearing 3-3, cutting the magnetic flux lines of the inner ring stator 3-1 at the top of the outer ring of the inner ring bearing 3-3 to generate electricity. A surplus energy recovery device 107 is provided to further generate hydroelectric power from the concentrated water obtained from seawater desalination, thereby improving the utilization efficiency of water resources and the power generation efficiency.

[0062] In one embodiment, the preset angle is 15 degrees. The curve of the lift coefficient and drag coefficient of the blades 3-5 of the second power generation component 3 obtained by software simulation as a function of the angle of attack is shown as follows: Figure 9 As 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, Figure 4As shown, when the angle of attack is 15 degrees tilted at the blade 3 - 5 , the blade 3 - 5 can be best pushed to rotate when dropped from above the blade 3 - 5 .

[0063] In one embodiment, Figure 8 and Figure 11 As shown, the second power generation assembly 3 also includes a support baffle 3-6 and a support spring 3-7. These baffles 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 baffle 3-6 facing the inner ring support 3-4, while the other end is fixedly connected to the side of the inner ring support 3-4. The top of the baffle 3-6 is movably connected to the bottom of the outer ring support 2-4, specifically via a hinge. The bottom of the baffle 3-6 is vertically inclined outward, and the distance from the outermost edge of the 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. Multiple baffles 3-6 and springs are provided, circumferentially arranged around the inner ring support 3-4. When the amount of water ejected from the water jet outlet is large, the work done by the gravitational potential energy generated by the water flowing down the paddle 2-5 will act on the support baffle 3-6. When the support baffle 3-6 is pressed, the connected support spring 3-7 is compressed, and the support baffle 3-6 moves toward the axis of the inner ring support 3-4, increasing the cross-sectional area at the bottom that can accommodate water flow. While ensuring pressure relief, it also increases the contact area between the water flow and the bottom blades 3-5, further enhancing the propulsion effect on the blades 3-5 and accelerating the rotation of the bottom blades 3-5. When the amount of water ejected from the water jet outlet decreases, the support baffle 3-6 returns to its normal position under the reset action of the support spring 3-7, reducing the cross-sectional area at the bottom that can accommodate water flow, which can increase the pressure of the water flow on the bottom and increase the thrust of the bottom blades 3-5. At the same time, the water flow contacts more of the outer edge of the blade 3-5 (i.e., away from the axial direction of the inner ring support 3-4). Under the same flow rate, more thrust is applied to the outer edge of 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, which is installed on the water jet pipe 1 near the water jet outlet. The pressure regulating device 4 is used to adjust the water jet speed of the water jet outlet. The water jet speed of the water jet outlet can be adjusted by pressure regulation, thereby controlling the speed of the outer ring rotor 2-2. Figure 12As shown, the pressure regulating device 4 includes a water pipe support frame 4-1, a rotating motor 4-2, a screw 4-3, and an elastic blocking gasket 4-4. The water pipe support frame 4-1 is mounted on the water jetting pipe 1. The output shaft of the rotating motor 4-2 is fixedly connected to one end of the screw 4-3. The other end of the screw 4-3 passes through the water pipe support frame 4-1 and the wall of the water jetting pipe 1, communicating with the interior of the water jetting pipe 1. The end of the screw 4-3 that enters the water jetting pipe 1 is fixedly connected to the elastic blocking gasket 4-4. When the water flow in the water jet pipe 1 is low, the rotating motor 4-2 controls the screw 4-3 to rotate forward, and the screw 4-3 moves into the water jet pipe 1. At this time, the elastic blocking gasket 4-4 moves into the water jet pipe 1, and the cross-sectional area of the water jet pipe 1 near the rotating motor 4-2 side is reduced. The pipe away from the rotating motor 4-2 side is not occupied. At this time, the water flow in the water jet pipe 1 will contact the outer edge of the paddle 2-5 more, pushing the outer edge of the paddle 2-5 to rotate. Compared with pushing the inner edge of the paddle 2-5, the lever arm increases, thereby increasing the torque on the entire outer ring rotor 2-2 and increasing the speed of the outer ring rotor 2-2. When the water flow in the water jet pipe 1 is high, the rotating motor 4-2 controls the screw 4-3 to rotate reversely, and the screw 4-3 moves toward the outside of the water jet pipe 1. The cross-sectional area of the water jet pipe 1 near the rotating motor 4-2 side increases. Since the elastic blocking gasket 4-4 is flexible, when the cross-sectional area of the water jetting pipe 1 near the rotating motor 4-2 is the largest, the entire elastic blocking gasket 4-4 can be completely fitted to the inner wall of the water jetting pipe 1, thereby making the entire water jetting pipe 1 fully open, and at this time, the water flow in the water jetting pipe 1 can pass more smoothly and stably. In a specific application scenario, the screw 4-3 extends from the pipe wall of the water jetting pipe 1 toward the side of the paddle 2-5 into the interior of the water jetting pipe 1, so that when the entire water jetting pipe 1 is fully open and the elastic blocking gasket 4-4 moves into the interior of the water jetting pipe 1, the water ejected from the water jetting outlet can impact the outer edge of the paddle 2-5, thereby increasing the torque on the outer ring rotor 2-2 and thereby increasing the speed of the outer ring rotor 2-2.

[0065] In one embodiment, Figure 8 As shown, there are multiple outer ring rotors 2-2, which are evenly spaced and circumferentially distributed on the top of the inner ring of the outer ring bearing 2-3. There are multiple outer ring stators 2-1, which are evenly spaced and circumferentially distributed on the top of the outer ring of the outer ring bearing 2-3, thereby improving the power generation efficiency of the first power generation component 2. There are multiple inner ring rotors 3-2, which are evenly spaced and circumferentially distributed on the top of the inner ring of the inner ring bearing 3-3. There are multiple inner ring stators 3-1, which are evenly spaced and circumferentially distributed on the top of the outer ring of the inner ring bearing 3-3, thereby improving the power generation efficiency of the second power generation component 3.

[0066] In one embodiment, Figure 13As shown, the dual-axis power generation device provided by the present invention also includes a detachable housing 5, in which 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. 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, preventing the internal components of the dual-axis power generation device from being damaged 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 via a connecting assembly. The bottom of the outer ring support 2-4 of the first power generation assembly 2 is suspended. The bottom of the inner ring support 3-4 of the second power generation assembly 3 can be movably connected to the inner bottom of the detachable housing 5 via a movable connection.

[0067] In one embodiment, a water recovery device is further included. The water recovery device is installed below the second power generation component 3. The water recovery device is used to collect water that falls below the second power generation component 3 to collect water for power generation.

[0068] The terms "first," "second," and the like in the description of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0069] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A membrane seawater desalination system, characterized in that: It includes 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 several electric control switches; The first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array each include a plurality of reverse osmosis membrane modules, which are arranged in a preset matrix. The input end of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array is commonly connected to the same raw water output port through its own input pipe. The output end of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array is configured with an electronically controlled switch. The output end of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array is commonly connected to the inlet of the first common output pipe through a first connecting pipe after passing through the electronically controlled switch. The number of rows and columns of the preset matrix is not less than 2. The input end of each reverse osmosis membrane module of the final reverse osmosis membrane array is commonly connected to the outlet of the first common output pipeline through its own input pipeline, the output end of each reverse osmosis membrane module of the final reverse osmosis membrane array is configured with an electric control switch, and the output end of each reverse osmosis membrane module of the final reverse osmosis membrane array is commonly connected to the inlet of the second common output pipeline through the second connecting pipeline after passing through the electric control switch; The output ends of each reverse osmosis membrane module of the first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array are respectively equipped with a fresh water output pipe and a concentrated water output pipe, each of which is equipped with an electric control switch. The fresh water output pipe is connected to the fresh water collection container, and the concentrated water output pipe is connected to the concentrated water collection container. It also includes an energy storage and release system; The energy storage and discharge system includes an energy storage tank group, an energy discharge tank group and a reserve tank group. Each tank in the energy storage tank group, the energy discharge tank group and the reserve tank group is equipped with an input switch and an output switch. The energy storage tank group, the energy discharge tank group and the reserve tank group are respectively equipped with a seawater input master switch and a seawater output master switch. The seawater input master switches of the energy storage tank group, the energy discharge tank group and the reserve tank group are commonly connected to the energy storage master switch. The seawater output master switches of the energy storage tank group, the energy discharge tank group and the reserve tank group are commonly connected to the energy discharge master switch. The energy discharge master switch is connected to the raw water output port. It also includes a pressure measuring instrument, 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; Also includes a controller; The controller is electrically connected to all the electric control switches, the seawater input master switch, the seawater output master switch, the energy storage master switch, the energy release master switch and the pressure measuring instrument respectively; The controller is used to control the opening and closing states of all the electric control switches according to the rear end pressure of the energy release master switch to control the series and parallel states of the first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array, so that when the rear end pressure of the energy release master switch is greater than a preset pressure, the first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array adopt a first-stage multi-stage circulating seawater desalination mode to desalinate seawater, and when the rear end pressure of the energy release master switch is not greater than the preset pressure, the first-stage multi-stage continuous seawater desalination mode is adopted to desalinate seawater; The first-stage multi-stage circulating seawater desalination mode is to collect the concentrated water produced after the raw water is desalinated, and the produced fresh water is desalinated in the next stage; The one-stage multi-stage continuous seawater desalination mode collects the fresh water produced after the raw water is desalinated, and the concentrated water produced is desalinated in the next stage.

2. The membrane seawater desalination system according to claim 1, characterized in that: It also includes at least one intermediate-stage reverse osmosis membrane array, the structure of the intermediate-stage reverse osmosis membrane array is the same as that of the first-stage reverse osmosis membrane array, the intermediate-stage reverse osmosis membrane array is connected between the first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array, and when there are no less than two intermediate-stage reverse osmosis membrane arrays, they are connected in series between the first-stage reverse osmosis membrane array and the final-stage reverse osmosis membrane array.

3. The membrane seawater desalination system according to claim 2, characterized in that: Two electric switches are arranged on the connecting pipe of each reverse osmosis membrane module communicating with the fresh water collection container. The two electric switches are connected to the inlet of the next reverse osmosis membrane array via an intermediate pipe equipped with an electric switch.

4. The membrane seawater desalination system according to claim 1, characterized in that: When the pressure at the rear end of the energy release main switch is less than 6MPa, the controller determines whether the pressure at the rear end of the energy release main switch is greater than 3MPa. If so, the controller further determines whether the pressure at the rear end of the energy release main switch is greater than 5MPa. If it is greater than 5MPa, a one-stage multi-stage circulating seawater desalination mode is adopted for seawater desalination. If it is not greater than 5MPa, a one-stage multi-stage continuous seawater desalination mode is adopted for seawater desalination. If the pressure at the rear end of the energy release main switch is not greater than 3MPa, 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, the controller determines whether the pressure at the rear end of the energy release main switch is greater than 3MPa. When the pressure at the rear end of the energy release main switch is not less than 6MPa, the controller closes the output switches of the opened energy release tanks one by one. After closing the output switch of each opened energy release tank, the controller performs a judgment operation to determine whether the pressure at the rear end of the energy release main switch is greater than 3MPa.

5. The membrane seawater desalination system according to any one of claims 1 to 4, characterized in that: It also includes a residual energy recovery device; The surplus energy recovery device includes a water jet pipe, a first power generation component and a second power generation component; The first power generation assembly includes an outer ring stator, an outer ring rotor, an outer ring bearing, an outer ring support, and a paddle. The bottom of the inner ring of the outer ring bearing is fixedly connected to the top of the outer ring support. The outer ring rotor is mounted on the frame at the top of the inner ring of the outer ring bearing. The outer ring stator is mounted on the frame at the top of the outer ring of the outer ring bearing. A plurality of vertically mounted paddles are fixedly mounted on the outer surface of the outer ring support in a circumferential direction. The second power generation assembly includes an inner ring stator, an inner ring rotor, an inner ring bearing, an inner ring support and blades. The bottom of the inner ring of the inner ring bearing is fixedly connected to the top of the inner ring support. The inner ring rotor is mounted on the frame at the top of the inner ring of the inner ring bearing. The inner ring stator is mounted on the frame at the top of the outer ring of the inner ring bearing. A plurality of vertically mounted blades are fixedly mounted circumferentially on the bottom side of the inner ring support. The bottom of the outer ring support is higher than the top of the blade. The blades are tilted at a preset angle. The distance from the end of the blade to the center of the inner ring support is not less than the distance from the end of the paddle to the center of the outer ring support. The inner ring bearing is arranged on the inner side of the inner ring of the outer ring bearing. The water jet inlet of the water jet pipe is connected with the water outlet of the concentrated water collecting container, and the water jet outlet of the water jet pipe is aligned with the paddle.

6. The membrane seawater desalination system according to claim 5, characterized in that: The second power generation assembly also includes a support baffle and a support spring; The support baffle and the support spring are located between the bottom of the outer ring pillar 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 pillar, and the other end of the support spring is fixedly connected to the side of the inner ring pillar. The top of the support baffle is movably connected to the bottom of the outer ring pillar. 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 pillar is smaller than the distance from the end of the blade to the center of the inner ring pillar.

7. The membrane seawater desalination system according to claim 5, characterized in that: There are multiple support baffles and support springs, and the multiple support baffles and support springs are circumferentially arranged around the inner circle support.

Images