Seawater desalination equipment

Abstract

The utility model discloses seawater desalination equipment and relates to the technical field of seawater desalination. The seawater desalination equipment comprises a pretreatment system and a reverse osmosis system which are sequentially connected through a pipeline, the pretreatment system at least comprises a multi-medium filter, an activated carbon filter and a precision filter which are connected in series through a pipeline, a filter material layer of the multi-medium filter comprises a quartz sand layer and a manganese sand layer, a filter material layer of the activated carbon filter is a coconut shell activated carbon layer, and a filter element of the precision filter is a melt-blown filter element; the reverse osmosis system comprises a high-pressure pump assembly and an RO membrane assembly, the high-pressure pump assembly at least comprises a first high-pressure water pump, a second high-pressure water pump and a third high-pressure water pump which are connected in parallel through pipelines, the RO membrane assembly comprises a plurality of groups of membrane shells which are connected in parallel through pipelines, and a roll-type RO membrane element is arranged in each group of membrane shells. The seawater desalination equipment can be used for better pretreating seawater and reducing the pollution of the seawater to a subsequent reverse osmosis system.

Description

Technical Field

[0001] This utility model relates to the field of seawater desalination technology, and in particular to a seawater desalination device. Background Technology

[0002] Seawater desalination is the process of producing fresh water by removing salt from seawater. It increases the total amount of fresh water available and is unaffected by time, space, or climate, ensuring a stable water supply for coastal residents' drinking water and industrial boiler feedwater. Common desalination methods include distillation and reverse osmosis. Reverse osmosis utilizes the properties of a semi-permeable membrane to achieve seawater desalination. This membrane allows only solvent molecules (such as water) to pass through, while solute molecules (such as salts) are blocked. When seawater and freshwater are separated by this membrane, applying a pressure greater than the osmotic pressure to the seawater side forces water molecules to permeate through the membrane to the freshwater side, while solutes (such as salts) remain on the seawater side, thus achieving desalination.

[0003] However, existing reverse osmosis seawater desalination equipment has the following problems during operation: suspended particles and colloids in seawater are easily adsorbed on the surface of its RO membrane (reverse osmosis membrane), causing RO membrane fouling and membrane pore blockage, which affects the seawater desalination effect, shortens the chemical cleaning cycle of the RO membrane, increases costs, and also shortens the service life of the equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a seawater desalination device that can better pre-treat seawater and reduce the pollution of seawater to the subsequent reverse osmosis system.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A seawater desalination device includes a pretreatment system and a reverse osmosis system connected in sequence via pipelines. The pretreatment system includes at least a multi-media filter, an activated carbon filter, and a precision filter connected in series via pipelines. The filter media layer of the multi-media filter includes a quartz sand layer and a manganese sand layer. The filter media layer of the activated carbon filter is a coconut shell activated carbon layer. The filter element of the precision filter is a melt-blown filter element. The reverse osmosis system includes a high-pressure pump assembly and an RO membrane assembly. The high-pressure pump assembly includes at least a first high-pressure water pump, a second high-pressure water pump, and a third high-pressure water pump connected in parallel via pipelines. The RO membrane assembly includes multiple sets of membrane housings connected in parallel via pipelines, and each set of membrane housings is equipped with a spiral wound RO membrane element.

[0007] In some embodiments, the particle size of the quartz sand layer is 0.6 to 1.5 mm.

[0008] In some embodiments, the iodine value of the coconut shell activated carbon layer is ≥1050 mg / g.

[0009] In some embodiments, the filtration accuracy of the meltblown filter element is 5 μm.

[0010] In some embodiments, a pressure gauge is installed on the outlet pipe of the pretreatment system to monitor the outlet pressure of the pretreatment system in real time.

[0011] In some embodiments, a sampling valve is installed at the inlet end of the membrane housing for sampling to monitor the quality of the incoming water.

[0012] In some embodiments, the seawater desalination equipment further includes a PLC control box, a pressure sensor, and a conductivity meter. The pressure sensor is installed in the outlet pipe of the high-pressure pump assembly, the inlet pipe of the RO membrane assembly, the outlet pipe, and the concentrate pipe. The conductivity meter is installed in the inlet pipe of the RO membrane assembly, the outlet pipe, and the concentrate pipe. The pressure sensor and the conductivity meter are electrically connected to the PLC control box.

[0013] Compared with the prior art, this utility model achieves at least the following beneficial effects:

[0014] The three-stage filtration system, consisting of a multi-media filter, an activated carbon filter, and a precision filter, intercepts suspended particles and other pollutants in seawater step by step, thus pre-treating the seawater effectively. This reduces the pollution of the subsequent reverse osmosis system, improves the quality of the effluent, extends the chemical cleaning cycle of the RO membrane, reduces costs, and extends the service life of the seawater desalination equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0016] Figure 2 This is a front view of an embodiment of this application;

[0017] Figure 3 This is a top view of an embodiment of this application;

[0018] Figure 4 This is a right view of an embodiment of this application.

[0019] The following are the labels in the diagram: 1. Multi-media filter; 2. Activated carbon filter; 3. Precision filter; 4. High-pressure pump assembly; 41. First high-pressure water pump; 42. Second high-pressure water pump; 43. Third high-pressure water pump; 5. RO membrane assembly; 51. Membrane housing; 6. Pressure gauge; 7. Sampling valve; 8. PLC control box. Detailed Implementation

[0020] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of this application more complete and to fully convey the concept of the present application to those skilled in the art.

[0021] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] like Figures 1-4As shown in the embodiment of this application, a seawater desalination device includes a pretreatment system and a reverse osmosis system connected in sequence by pipelines. The pretreatment system includes at least a multi-media filter 1, an activated carbon filter 2, and a precision filter 3 connected in series by pipelines. The filter media layer of the multi-media filter 1 includes a quartz sand layer and a manganese sand layer. The filter media layer of the activated carbon filter 2 is a coconut shell activated carbon layer. The filter element of the precision filter 3 is a melt-blown filter element. The reverse osmosis system includes a high-pressure pump assembly 4 and an RO membrane assembly 5. The high-pressure pump assembly 4 includes at least a first high-pressure water pump 41, a second high-pressure water pump 42, and a third high-pressure water pump 43 connected in parallel by pipelines. The RO membrane assembly 5 includes multiple sets of membrane housings 51 connected in parallel by pipelines. Each set of membrane housings 51 is equipped with a spiral wound RO membrane element.

[0023] A three-stage filtration system consisting of a multi-media filter 1, an activated carbon filter 2, and a precision filter 3 progressively intercepts suspended particles and other pollutants in seawater, effectively pre-treating the seawater. This reduces seawater contamination of the subsequent reverse osmosis system, improves effluent quality, extends the chemical cleaning cycle of the RO membrane to over 1200 hours, reduces costs, and prolongs the service life of the seawater desalination equipment. A first high-pressure water pump 41, a second high-pressure water pump 42, and a third high-pressure water pump 43, connected in parallel, pressurize and deliver the pre-treated seawater to the RO membrane module 5. These three pumps serve as redundant backups for each other. The pressure can be selected from 6 to 8 MPa, meaning each pump can serve as a backup for the other two pumps. This ensures that if one or two pumps fail, require maintenance, or are unable to operate normally for other reasons, the backup pumps can take over all the work, guaranteeing an uninterrupted high-pressure water supply to the system. The three pumps operate in parallel, automatically adjusting their operating status according to system requirements and water quality changes, ensuring each pump operates within its high-efficiency range. This reduces electricity consumption per ton of water by 18% compared to a single-pump system. By setting up multiple sets of membrane housings 51 connected in parallel, the RO membrane module 5 can support continuous water production during single-module maintenance, avoiding system downtime and providing redundancy and reliability.

[0024] Optionally, the quartz sand layer has a particle size of 0.6–1.5 mm. The quartz sand layer first performs primary filtration of the seawater, effectively removing larger impurities such as sand, mud, and algae, thus reducing the turbidity of the seawater. The manganese sand layer is mainly used to remove iron and manganese ions from the seawater. The manganese dioxide and other components on the surface of the manganese sand have strong redox capabilities, capable of oxidizing ferrous ions to ferric ions and ferrous manganese ions to tetravalent manganese ions. Since high-valence iron and manganese ions have low solubility in water, they will… The precipitate is intercepted by the manganese sand layer. The manganese sand also has a certain adsorption and removal effect on some organic matter and microorganisms, enabling the multi-media filter 1 to retain particles >20μm and simultaneously oxidize and remove iron and manganese ions; the coconut shell activated carbon layer has an iodine value ≥1050mg / g, and the activated carbon filter 2 is used to adsorb organic matter such as residual chlorine and humic acid, reducing the risk of RO membrane fouling; the melt-blown filter cartridge has a filtration accuracy of 5μm, and the precision filter 3 is used to intercept micron-sized impurities that escape from the front stage, ensuring that the water quality entering the RO membrane is SDI≤3.

[0025] Optionally, a pressure gauge 6 is installed on the outlet pipe of the pretreatment system. The pressure gauge 6 is used to monitor the outlet pressure of the pretreatment system in real time, assess the clogging of the filter by pressure changes, and clean or replace the filter media in a timely manner to maintain the filtration effect.

[0026] Optionally, a sampling valve 7 is installed at the inlet end of the membrane housing 51. The sampling valve 7 is used to take samples to monitor the quality of the inlet water, evaluate the pretreatment effect, ensure that the inlet water meets the requirements of the RO membrane, and prevent the RO membrane from being contaminated.

[0027] In addition, the seawater desalination equipment also includes a PLC control box 8, pressure sensors, and conductivity meters. The pressure sensors are installed in the outlet pipe of the high-pressure pump assembly 4, the inlet pipe, outlet pipe, and concentrate pipe of the RO membrane assembly 5, thereby monitoring the outlet pressure of the high-pressure pump assembly 4 to ensure that the high-pressure pump assembly 4 provides sufficient pressure to meet the needs of the RO membrane; monitoring the pressure before entering the RO membrane to ensure that the pressure before the membrane is within a reasonable range to prevent membrane damage; monitoring the pressure after the RO membrane to assess the membrane pressure drop to determine membrane fouling or blockage; and monitoring the concentrate discharge pressure to ensure smooth concentrate discharge. The conductivity meters are installed in the inlet pipe, outlet pipe, and concentrate pipe of the RO membrane assembly 5, thereby monitoring the conductivity of the raw water to assess the salinity of the raw water and determine the pretreatment effect; monitoring the conductivity of the product water to assess the desalination effect and ensure that the product water quality meets the standards; and monitoring the conductivity of the concentrate water to assess the system recovery rate and optimize operating parameters. The PLC control box 8 adjusts the frequency of the high-pressure pump assembly 4 and the start / stop of the RO membrane assembly 5 in real time according to the monitoring situation. The PLC system has built-in fault self-diagnosis and water quality exceeding alarm functions, supports remote start / stop and data traceability, and realizes intelligent operation and maintenance.

[0028] This seawater desalination equipment can effectively address the contradiction between limited equipment space and high salinity water treatment efficiency in scenarios such as ocean-going vessels and offshore platforms. It can adapt to raw water conditions with TDS≥35000mg / L, and the produced water meets the ISO10303-21 drinking water standard. It is also compatible with brackish water desalination, and the system recovery rate is increased to 45%-50%.

[0029] It should be understood that all the above embodiments are exemplary and not restrictive. Any modifications, equivalent changes and alterations made by those skilled in the art to the specific embodiments described above under the concept of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A seawater desalination device, characterized in that: The system includes a pretreatment system and a reverse osmosis system connected sequentially via pipelines. The pretreatment system includes at least a multi-media filter, an activated carbon filter, and a precision filter connected in series via pipelines. The filter media layer of the multi-media filter includes a quartz sand layer and a manganese sand layer. The filter media layer of the activated carbon filter is a coconut shell activated carbon layer. The filter element of the precision filter is a melt-blown filter element. The reverse osmosis system includes a high-pressure pump assembly and an RO membrane assembly. The high-pressure pump assembly includes at least a first high-pressure water pump, a second high-pressure water pump, and a third high-pressure water pump connected in parallel via pipelines. The RO membrane assembly includes multiple sets of membrane housings connected in parallel via pipelines. Each set of membrane housings contains a spiral wound RO membrane element.

2. The seawater desalination equipment according to claim 1, characterized in that: The particle size of the quartz sand layer is 0.6 to 1.5 mm.

3. The seawater desalination equipment according to claim 1, characterized in that: The iodine value of the coconut shell activated carbon layer is ≥1050 mg / g.

4. The seawater desalination equipment according to claim 1, characterized in that: The filtration accuracy of the meltblown filter element is 5μm.

5. The seawater desalination equipment according to claim 1, characterized in that: A pressure gauge is installed on the outlet pipe of the pretreatment system, and the pressure gauge is used to monitor the outlet pressure of the pretreatment system in real time.

6. The seawater desalination equipment according to claim 1, characterized in that: A sampling valve is installed at the water inlet end of the membrane housing, and the sampling valve is used to take samples to monitor the water quality of the inlet water.

7. The seawater desalination equipment according to claim 1, characterized in that: It also includes a PLC control box, a pressure sensor and a conductivity meter. The pressure sensor is installed in the outlet pipe of the high-pressure pump assembly, the inlet pipe, the outlet pipe and the concentrate pipe of the RO membrane assembly. The conductivity meter is installed in the inlet pipe, the outlet pipe and the concentrate pipe of the RO membrane assembly. The pressure sensor and the conductivity meter are electrically connected to the PLC control box.

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