Energy storage device based on seawater desalination

Abstract

The utility model relates to the technical field of seawater desalination, in particular to an energy storage device based on seawater desalination. According to the energy storage device based on seawater desalination, an ultrafiltration membrane assembly is connected to a raw water tank, the output end of the ultrafiltration membrane assembly is connected with an RO membrane assembly and a reverse electrodialysis membrane assembly, the RO membrane assembly is provided with a fresh water outlet and a concentrated water outlet, and the concentrated water outlet is communicated with the reverse electrodialysis membrane assembly. A water outlet of the reverse electrodialysis membrane assembly is communicated with the raw water tank, so that ion selective permeable membranes are placed between salt solutions with different concentrations, and the ion selective permeable membranes are directionally migrated between the ion exchange membranes by utilizing the concentration difference between different ions, so that chemical potential energy is directly converted into electric energy.

Description

TECHNICAL FIELD

[0001] The utility model relates to sea water desalination technical field, concretely relates to a kind of energy storage device based on sea water desalination. BACKGROUND

[0002] In recent years, sea water desalination technology has been accelerated with the aggravation of water crisis. Reverse osmosis membrane method rapidly occupies the market with its simple equipment, easy maintenance and equipment modularization advantages, has been used on a large scale, gradually replaces distillation method and becomes the most widely used method. While desalinating sea water by reverse osmosis membrane method, a concentrated sea water, i.e. sodium chloride content of about 6%, is obtained. The concentrated sea water of this concentration cannot be used, and is usually directly discharged into the sea. At present, there is no suitable technology for secondary utilization of the concentrated brine, resulting in waste of energy. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art, and provides an energy storage device based on sea water desalination.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an energy storage device based on sea water desalination, comprising a raw water tank, an ultrafiltration membrane assembly is connected to the raw water tank, an RO membrane assembly and a reverse electrodialysis membrane assembly are connected to the output end of the ultrafiltration membrane assembly, a fresh water outlet and a concentrated water outlet are arranged on the RO membrane assembly, the concentrated water outlet is communicated with the reverse electrodialysis membrane assembly, and the outlet of the reverse electrodialysis membrane assembly is communicated with the raw water tank.

[0005] Further, the reverse electrodialysis membrane assembly comprises a storage battery for storing electric quantity, positive plates and negative plates are installed on both sides of the storage battery, cation exchange membranes and anion exchange membranes are installed between the positive plates and the negative plates, and the cation exchange membranes and the anion exchange membranes divide a solution chamber into a concentrated water chamber and a fresh water chamber.

[0006] Further, the cation exchange membranes and the anion exchange membranes comprise a plurality of cation exchange membranes and a plurality of anion exchange membranes, and the plurality of cation exchange membranes and the plurality of anion exchange membranes are arranged in a staggered manner.

[0007] Further, a first water inlet pump is installed between the raw water tank and the ultrafiltration membrane assembly, and a first pressure gauge is installed between the first water inlet pump and the ultrafiltration membrane assembly.

[0008] Further, an ultrafiltration water storage tank is connected to the first output end of the ultrafiltration membrane assembly, a second water inlet pump is connected to the output end of the ultrafiltration water storage tank, and the output end of the second water inlet pump is communicated with the RO membrane assembly and the reverse electrodialysis membrane assembly.

[0009] Further, a second pressure gauge is installed between the second water inlet pump and the RO membrane assembly; a third pressure gauge is installed between the second water inlet pump and the reverse electrodialysis membrane assembly.

[0010] Further, a second output end of the ultrafiltration membrane assembly is communicated with the raw water tank.

[0011] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0012] 1. The raw water tank is connected with the ultrafiltration membrane assembly, the output end of the ultrafiltration membrane assembly is connected with the RO membrane assembly and the reverse electrodialysis membrane assembly, the RO membrane assembly is provided with a fresh water outlet and a concentrated water outlet, the concentrated water outlet is communicated with the reverse electrodialysis membrane assembly, and the outlet of the reverse electrodialysis membrane assembly is communicated with the raw water tank, so that the ion-selective membrane is placed between salt solutions with different concentrations, the concentration difference between different ions is utilized to make directional migration between the ion exchange membranes, and chemical potential energy is directly converted into electric energy.

[0013] 2. The salt concentration difference power generation is clean and renewable by combining the seawater desalination and reverse electrodialysis technologies and utilizing the salt concentration difference between high-concentration seawater and ordinary seawater. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 Fig. 1 is a structure schematic view of an energy storage device based on seawater desalination in preferred embodiments of the present application;

[0015] Fig. 2 Fig. 2 is a structure schematic view of a reverse electrodialysis membrane assembly in preferred embodiments of the present application.

[0016] Fig. 1 is a structure schematic view of an energy storage device based on seawater desalination in preferred embodiments of the present application; DETAILED DESCRIPTION

[0017] The technical scheme in the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0018] The principle of salt concentration power generation: placing ion selective permeable membrane between different concentrations of salt solution, due to the ion concentration difference between the two sides of the membrane, ions will migrate from the high concentration side of the ion exchange membrane to the low concentration side, and the ion will directly convert the chemical potential energy into electrical energy in the process of penetrating the membrane.

[0019] Referring to Figs. 1-2 As shown in the preferred embodiment of the utility model, a kind of energy storage device based on seawater desalination, the raw water tank 1 is connected with ultrafiltration membrane assembly 4, the output end of the ultrafiltration membrane assembly 5 is connected with RO membrane assembly 9, reverse electrodialysis membrane assembly 10, the RO membrane assembly 9 is equipped with fresh water outlet, concentrated water outlet, the concentrated water outlet is connected with the reverse electrodialysis membrane assembly 10, and the outlet of the reverse electrodialysis membrane assembly 10 is connected with the raw water tank 1, so that ion selective permeable membrane is placed between different concentrations of salt solution, the concentration difference between different ions is utilized, so that it migrates directionally between ion exchange membrane, and then chemical potential energy is directly converted into electrical energy.

[0020] As the preferred embodiment of the utility model, it can also have the following additional technical features: reverse electrodialysis membrane assembly 10 includes battery 1001 for storing electric quantity, positive plate 1003 and negative plate 1004 are installed on the two sides of the battery, cation exchange membrane 1005 and anion exchange membrane 1006 are installed between the positive plate 1003 and the negative plate 1004, and the cation exchange membrane 1005 and the anion exchange membrane 1006 divide solution chamber 1002 into concentrated water chamber and fresh water chamber. The cation exchange membrane 1005 and the anion exchange membrane 1006 include several, and the cation exchange membrane 1005 and the anion exchange membrane 1006 are arranged alternately. Because the cation exchange membrane 1005 can selectively make cations pass through the membrane and prevent anions from passing through, the anion exchange membrane 1006 can selectively make anions pass through the membrane and prevent cations from passing through. Cation and anion exchange membranes are alternately arranged to form different compartments. Different concentrations of solution are filled in the compartments of the membrane and between the membrane and the electrode, forming a continuous conductive path. The electrode is connected with an external circuit, and oxidation-reduction reaction occurs at the anode and the cathode, converting the potential energy of ion migration into usable electrical energy.

[0021] In the embodiment, first water inlet pump 2 is installed between raw water tank 1 and ultrafiltration membrane assembly 4, and first pressure gauge 3 is installed between first water inlet pump 2 and ultrafiltration membrane assembly 4. Thus, the filtration of seawater is realized.

[0022] In the embodiment, the first output end of the ultrafiltration membrane assembly 4 is connected with an ultrafiltration water storage tank 8, the output end of the ultrafiltration water storage tank 8 is connected with a second water inlet pump 6, and the output end of the second water inlet pump 6 is connected with the RO membrane assembly 9 and the reverse electrodialysis membrane assembly 10 respectively. Thus, the ion concentration difference exists on the reverse electrodialysis membrane assembly 10, and the ions migrate from the side with high ion concentration to the side with low ion concentration, and the chemical potential energy is directly converted into electric energy in the process of penetrating the membrane.

[0023] In the embodiment, the second water inlet pump 6 is provided with a second pressure gauge 7 between the second water inlet pump 6 and the RO membrane assembly 9, and the second water inlet pump 6 is provided with a third pressure gauge 8 between the second water inlet pump 6 and the reverse electrodialysis membrane assembly 10. Thus, the concentration difference between the concentrated brine and the dilute brine can be controlled.

[0024] In the embodiment, the second output end of the ultrafiltration membrane assembly 4 is connected with the raw water tank 1. Thus, the impurities after filtration are discharged into the raw water tank.

[0025] The working principle of the utility model is as follows: seawater is filled into the raw water tank 1, and the seawater is sent into the ultrafiltration membrane (UF) assembly 4 through the first water inlet pump 2. The first pressure gauge 3 controls the pressure of seawater into the ultrafiltration membrane. The ultrafiltration membrane assembly 4 can intercept the insoluble impurities, microorganisms and the like in seawater, and provide protection for the subsequent membrane filtration system.

[0026] The ultrafiltration water tank 5 can send the seawater filtered by the ultrafiltration membrane to the RO membrane assembly 9 through the second water inlet pump 6. After the seawater is filtered through the RO membrane, the desalinated seawater and seawater concentrate can be obtained. The seawater concentrate enters the reverse electrodialysis membrane assembly 10. The seawater filtered by the ultrafiltration membrane also enters the reverse electrodialysis membrane assembly 10. Because there is a concentration difference of about 3% between the seawater concentrate and the seawater, electric energy can be generated through the reverse electrodialysis assembly 10. After the seawater passes through the reverse electrodialysis assembly, the salinity increases, and the seawater is discharged for treatment. The desalinated liquid from the reverse electrodialysis is returned to the raw water tank 1 of the ultrafiltration, so as to realize the function of generating power by the concentrated brine after seawater desalination.

[0027] On the premise of no conflict, the person skilled in the art can freely combine and superimpose the above-mentioned additional technical features.

[0028] It can be understood that the utility model is described through some embodiments, and the person skilled in the art knows that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope of protection of the utility model.

Claims

1. A seawater desalination based energy storage device, characterized by: The application relates to a water treatment device, which comprises a raw water tank, a ultrafiltration membrane assembly connected to the raw water tank, an RO membrane assembly connected to the output end of the ultrafiltration membrane assembly, and a reverse electrodialysis membrane assembly.

2. The seawater desalination based energy storage device of claim 1, wherein: The reverse electrodialysis membrane assembly comprises a battery for storing electric quantity, positive plates and negative plates arranged on the two sides of the battery, cation exchange membranes and anion exchange membranes arranged between the positive plates and the negative plates, and the cation exchange membranes and the anion exchange membranes divide a solution chamber into a concentrated water chamber and a fresh water chamber.

3. The seawater desalination based energy storage device of claim 2, wherein: The cation exchange membranes and the anion exchange membranes are arranged in an interlaced mode.

4. The seawater desalination based energy storage device of claim 1, wherein: A first water inlet pump is arranged between the raw water tank and the ultrafiltration membrane assembly, and a first pressure gauge is arranged between the first water inlet pump and the ultrafiltration membrane assembly.

5. The seawater desalination based energy storage device of claim 1, wherein: The first output end of the ultrafiltration membrane assembly is connected with an ultrafiltration water storage tank, the output end of the ultrafiltration water storage tank is connected with a second water inlet pump, and the output end of the second water inlet pump is respectively connected with the RO membrane assembly and the reverse electrodialysis membrane assembly.

6. The seawater desalination based energy storage device of claim 5, wherein: A second pressure gauge is arranged between the second water inlet pump and the RO membrane assembly, and a third pressure gauge is arranged between the second water inlet pump and the reverse electrodialysis membrane assembly.

7. The seawater desalination based energy storage device of claim 1, wherein: The second output end of the ultrafiltration membrane assembly is connected with the raw water tank.

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