CN217535536U - Seawater desalination device - Google Patents
Seawater desalination device Download PDFInfo
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- CN217535536U CN217535536U CN202221234238.7U CN202221234238U CN217535536U CN 217535536 U CN217535536 U CN 217535536U CN 202221234238 U CN202221234238 U CN 202221234238U CN 217535536 U CN217535536 U CN 217535536U
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Abstract
The application relates to a seawater desalination device, including: a first reverse osmosis unit and a hollow fiber membrane module. The water inlet end of the first reverse osmosis device is used for introducing seawater to be treated, the fresh water producing end of the first reverse osmosis device is used for discharging finally produced fresh water, and the concentrated water producing end of the first reverse osmosis device is communicated with the water inlet end of the hollow fiber membrane component. The fresh water producing end of the hollow fiber membrane component is communicated with the water inlet end of the first reverse osmosis device, and the concentrated water producing end of the hollow fiber membrane component is respectively used for discharging the produced concentrated seawater and is communicated with the concentrated water return end of the hollow fiber membrane component. The seawater to be treated is concentrated by arranging the first reverse osmosis device, the concentrated seawater produced by the first reverse osmosis device enters the hollow fiber membrane component for concentration again, and the concentrated seawater produced by the part of the hollow fiber membrane component flows back to the side, on which the reverse osmosis membrane of the hollow fiber membrane component produces fresh water, so that the concentration difference of the two sides of the reverse osmosis membrane is reduced, and the concentration efficiency is improved.
Description
Technical Field
The application relates to the technical field of seawater desalination, in particular to a seawater desalination device.
Background
The reverse osmosis seawater desalination technology has the characteristics of low energy consumption, high recovery rate and flexible scale, and is rapidly developed from the middle of the twentieth century. The method is different from a seawater desalination low-temperature multi-effect technology (MED) and a seawater desalination multi-stage flash evaporation technology (MSF) in that the method is free from the limitation of heat energy, so that the method can be more flexibly deployed to produce fresh water. At least 70% of the seawater desalination projects so far have been constructed on the principle of reverse osmosis.
The by-product of seawater desalination, concentrated seawater, not only has high salt content, but also contains some chemical substances during seawater pretreatment, and if the chemical substances are discharged improperly, soil, surface water, marine environment and the like can be polluted. Therefore, the concentrated seawater is treated by extracting potassium from seawater, extracting bromine from seawater, preparing magnesium from seawater and the like, so that the concentrated seawater can be recycled, and the influence of the discharge on the quality of the seawater is also solved.
However, the conventional reverse osmosis membrane technology has a limited effect of concentrating seawater. How to improve the concentration of the produced concentrated seawater in the seawater desalination process so as to reduce the energy consumption of extracting chemical substances in the comprehensive utilization process of seawater resources becomes a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of this, the application provides a seawater desalination device, compared with the traditional reverse osmosis membrane technology, the concentration of the produced concentrated seawater in the seawater desalination process is improved.
According to an aspect of the present application, there is provided a seawater desalination apparatus comprising:
a first reverse osmosis unit and a hollow fiber membrane module;
the water inlet end of the first reverse osmosis device is used for introducing seawater to be treated, the fresh water producing end of the first reverse osmosis device is used for discharging finally produced fresh water, and the concentrated water producing end of the first reverse osmosis device is communicated with the water inlet end of the hollow fiber membrane component;
the fresh water producing end of the hollow fiber membrane component is communicated with the water inlet end of the first reverse osmosis device, and the concentrated water producing end of the hollow fiber membrane component is respectively used for discharging the produced concentrated seawater and is communicated with the concentrated water return end of the hollow fiber membrane component.
In one possible implementation, the system further comprises a second reverse osmosis device;
the water inlet end of the second reverse osmosis device is used for introducing seawater to be treated, the fresh water producing end of the second reverse osmosis device is communicated with the water inlet end of the first reverse osmosis device, and the concentrated water producing end of the second reverse osmosis device is used for discharging the concentrated seawater.
In one possible implementation, the system further comprises a security filter;
the water inlet end of the cartridge filter is communicated with the concentrated water producing end of the first reverse osmosis device, and the water outlet end of the cartridge filter is communicated with the water inlet end of the hollow fiber membrane component.
In one possible implementation, the system further comprises a first booster pump;
the water inlet end of the first booster pump is communicated with the water outlet end of the cartridge filter, and the water outlet end of the first booster pump is communicated with the water inlet end of the hollow fiber membrane component.
In one possible implementation, the reverse osmosis membrane of the second reverse osmosis device is a nanofiltration membrane.
In one possible implementation, the first reverse osmosis unit is a STRO membrane module.
In one possible implementation, the reverse osmosis membrane of the hollow fiber membrane module is made of cellulose triacetate.
In a possible implementation manner, the system further comprises a second booster pump;
and the water inlet end of the second booster pump is used for introducing seawater to be treated, and the water outlet end of the second booster pump is communicated with the water inlet end of the second reverse osmosis device.
In a possible implementation manner, a third booster pump is further included;
and the water inlet end of the third booster pump is communicated with the fresh water producing end of the second reverse osmosis device, and the water outlet end of the third booster pump is communicated with the water inlet end of the first reverse osmosis device.
The application is suitable for desalting seawater and improving the concentration of the generated concentrated seawater. The seawater to be treated is concentrated by arranging the first reverse osmosis device, the fresh water produced by the first reverse osmosis device is the final produced fresh water in the application, the concentrated seawater produced by the first reverse osmosis device enters the hollow fiber membrane component for concentration again, the concentrated seawater discharged from the concentrated water producing end of the hollow fiber membrane component is used for comprehensive utilization of seawater resources, the concentrated seawater produced by the part of the hollow fiber membrane component flows back to the fresh water producing side of the reverse osmosis membrane of the hollow fiber membrane component, the liquid concentration on the fresh water producing side of the reverse osmosis membrane of the hollow fiber membrane component is increased, the concentration difference on two sides of the reverse osmosis membrane is reduced, and the concentration efficiency is improved. Part of the concentrated seawater which flows back into the hollow fiber membrane module and the fresh water produced by the hollow fiber membrane module are discharged into the first reverse osmosis device again for concentration in a cycle, so that the concentration of the concentrated seawater produced by the hollow fiber membrane module is improved.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.
Fig. 1 is a main structure diagram of a seawater desalination apparatus according to an embodiment of the present invention;
fig. 2 shows a main body structure view at a hollow fiber module of the embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention or for simplicity in description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.
Fig. 1 is a main structure diagram of an apparatus for desalinating seawater according to an embodiment of the present application. Fig. 2 illustrates a structure view of a main body at a hollow fiber module according to an embodiment of the present application. As shown in fig. 1, the seawater desalination apparatus includes: a first reverse osmosis unit 100 and a hollow fiber membrane module. The water inlet end of the first reverse osmosis device 100 is used for introducing seawater to be treated, the fresh water producing end of the first reverse osmosis device 100 is used for discharging finally produced fresh water, and the concentrated water producing end of the first reverse osmosis device 100 is communicated with the water inlet end of the hollow fiber membrane component. The fresh water producing end of the hollow fiber membrane module 200 is communicated with the water inlet end of the first reverse osmosis device 100, and the concentrated water producing end of the hollow fiber membrane module 200 is respectively used for discharging the produced concentrated seawater and is communicated with the concentrated water return end of the hollow fiber membrane module 200.
The application is suitable for desalting seawater and improving the concentration of the generated concentrated seawater. The seawater to be treated is concentrated by arranging the first reverse osmosis device 100, the fresh water produced by the first reverse osmosis device 100, namely RO produced water, is the fresh water finally produced by the application, the thicker seawater produced by the first reverse osmosis device 100, namely RO concentrated water, enters the hollow fiber membrane module for secondary concentration, the concentrated seawater discharged from the concentrated water producing end of the hollow fiber membrane module 200, namely SC concentrated water, is used for comprehensive utilization of seawater resources, the concentrated seawater produced by part of the hollow fiber membrane module 200 flows back to the fresh water producing side of the reverse osmosis membrane of the hollow fiber membrane module 200, the liquid concentration on the fresh water producing side of the reverse osmosis membrane of the hollow fiber membrane module 200 is increased, the concentration difference on the two sides of the reverse osmosis membrane is reduced, and the concentration efficiency is improved. Part of the concentrated seawater which flows back into the hollow fiber membrane module 200 and the fresh water produced by the hollow fiber membrane module 200, namely the SC dilution water, are discharged into the first reverse osmosis device 100 again for concentration in cycles, thereby increasing the concentration of the concentrated seawater produced by the hollow fiber membrane module 200.
Here, it should be noted that the hollow fiber membrane module 200 includes a plurality of reverse osmosis membrane tubes, the relatively concentrated seawater discharged from the first reverse osmosis device 100 is located outside the reverse osmosis membrane tubes, under the action of pressure, the clear water enters inside the reverse osmosis membrane tubes, and the concentrated seawater produced in part of the hollow fiber membrane module 200 flows back to inside of the reverse osmosis membrane tubes to reduce the concentration difference between two sides of the reverse osmosis membrane tubes, so as to improve the concentration efficiency.
In one possible implementation, a second reverse osmosis apparatus 300 is also included. The water inlet end of the second reverse osmosis device 300 is used for introducing seawater to be treated, the fresh water producing end of the second reverse osmosis device 300 is communicated with the water inlet end of the first reverse osmosis device 100, and the concentrated water producing end of the second reverse osmosis device 300 is used for discharging produced concentrated seawater, namely NF concentrated water. The second reverse osmosis device 300 is used for purifying and decontaminating seawater to be treated, and the seawater to be treated, which is treated by the second reverse osmosis device 300, is NF product water, so that membrane pollution of the seawater to be treated on the first reverse osmosis device 100 and the hollow fiber membrane module 200 can be relieved.
Here, it should be noted that the concentrated seawater discharged from the second reverse osmosis apparatus 300, that is, NF concentrated water, and the concentrated seawater discharged from the hollow fiber membrane module 200 are concentrated seawater finally produced in the present application.
In one possible implementation, as shown in fig. 2, a security filter 210 is also included. The water inlet end of the cartridge filter 210 is communicated with the concentrated water producing end of the first reverse osmosis device 100, and the water outlet end of the cartridge filter 210 is communicated with the water inlet end of the hollow fiber membrane module 200. Through setting up cartridge filter 210, carry out effectual getting rid of to getting into the interior residual, suspended solid and the colloidal substance of more concentrated seawater of hollow fiber membrane module 200, prolong the life of this application.
In one possible implementation, a first booster pump 220 is also included. The water inlet end of the first booster pump 220 is communicated with the water outlet end of the cartridge filter 210, and the water outlet end of the first booster pump 220 is communicated with the water inlet end of the hollow fiber membrane module 200, so that the hollow fiber membrane module 200 reaches the working pressure by arranging the first booster pump 220.
In one possible implementation, the reverse osmosis membrane of the second reverse osmosis device 300 is a nanofiltration membrane. The nanofiltration membrane is a functional semipermeable membrane that allows solvent molecules or certain low molecular weight solutes or low valent ions to permeate therethrough, so that the second reverse osmosis apparatus 300 achieves the purpose of removing impurities.
In one possible implementation, the first reverse osmosis unit 100 is a STRO membrane module. The reverse osmosis membrane of the STRO membrane component adopts a STRO membrane (pipe network type reverse osmosis membrane), and compared with the common reverse osmosis membrane, the STRO has strong anti-fouling capability. STRO membranes (pipe-network reverse osmosis membranes) are prior art and will not be described here.
In one possible implementation, the reverse osmosis membrane of the hollow fiber membrane module 200 is a cellulose triacetate material. Cellulose triacetate is also a good raw material for reverse osmosis membranes. When the content of acetic acid is 52.33% -55.95%, the cellulose acetate can be used for preparing a film with excellent performance.
In one possible implementation, a second booster pump is also included. The water inlet end of the second booster pump is used for introducing seawater to be treated, and the water outlet end of the second booster pump is communicated with the water inlet end of the second reverse osmosis device 300. The second reverse osmosis apparatus 300 is brought to the working pressure by providing the second booster pump.
In one possible implementation, a third booster pump is further included. The water inlet end of the third booster pump is communicated with the fresh water producing end of the second reverse osmosis device 300, and the water outlet end of the third booster pump is communicated with the water inlet end of the first reverse osmosis device 100. The first reverse osmosis apparatus 100 reaches the operating pressure by providing the third booster pump.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or improvements to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. A seawater desalination plant, comprising:
a first reverse osmosis unit and a hollow fiber membrane module;
the water inlet end of the first reverse osmosis device is used for introducing seawater to be treated, the fresh water producing end of the first reverse osmosis device is used for discharging finally produced fresh water, and the concentrated water producing end of the first reverse osmosis device is communicated with the water inlet end of the hollow fiber membrane component;
the fresh water producing end of the hollow fiber membrane component is communicated with the water inlet end of the first reverse osmosis device, and the concentrated water producing end of the hollow fiber membrane component is respectively used for discharging the produced concentrated seawater and is communicated with the concentrated water return end of the hollow fiber membrane component.
2. The seawater desalination apparatus of claim 1, further comprising a second reverse osmosis apparatus;
the water inlet end of the second reverse osmosis device is used for introducing seawater to be treated, the fresh water producing end of the second reverse osmosis device is communicated with the water inlet end of the first reverse osmosis device, and the concentrated water producing end of the second reverse osmosis device is used for discharging the concentrated seawater.
3. The seawater desalination apparatus of claim 1, further comprising a cartridge filter;
the water inlet end of the cartridge filter is communicated with the concentrated water producing end of the first reverse osmosis device, and the water outlet end of the cartridge filter is communicated with the water inlet end of the hollow fiber membrane component.
4. The seawater desalination apparatus of claim 3, further comprising a first booster pump;
the water inlet end of the first booster pump is communicated with the water outlet end of the cartridge filter, and the water outlet end of the first booster pump is communicated with the water inlet end of the hollow fiber membrane component.
5. The seawater desalination apparatus of claim 2, wherein the reverse osmosis membrane of the second reverse osmosis unit is a nanofiltration membrane.
6. The seawater desalination plant of claim 1, wherein the first reverse osmosis unit is a STRO membrane module.
7. The seawater desalination apparatus of claim 1, wherein the reverse osmosis membrane of the hollow fiber membrane module is made of cellulose triacetate.
8. The seawater desalination apparatus of claim 2, further comprising a second booster pump;
and the water inlet end of the second booster pump is used for introducing seawater to be treated, and the water outlet end of the second booster pump is communicated with the water inlet end of the second reverse osmosis device.
9. The seawater desalination apparatus of claim 2, further comprising a third booster pump;
and the water inlet end of the third booster pump is communicated with the fresh water producing end of the second reverse osmosis device, and the water outlet end of the third booster pump is communicated with the water inlet end of the first reverse osmosis device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221234238.7U CN217535536U (en) | 2022-05-20 | 2022-05-20 | Seawater desalination device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221234238.7U CN217535536U (en) | 2022-05-20 | 2022-05-20 | Seawater desalination device |
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| Publication Number | Publication Date |
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| CN217535536U true CN217535536U (en) | 2022-10-04 |
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| CN202221234238.7U Active CN217535536U (en) | 2022-05-20 | 2022-05-20 | Seawater desalination device |
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