Multistage reverse osmosis equipment for seawater desalination

Abstract

The multistage reverse osmosis equipment comprises a water inlet pipe, a filter screen is arranged at the water inlet end of the water inlet pipe, and a backwash pipe is arranged in the water inlet pipe in the direction opposite to the filter screen; the output end of the water inlet pipe is connected with a sand filter, the output end of the sand filter is connected with an activated carbon filter, the output end of the activated carbon filter is connected with an ultrafiltration filter, the output end of the ultrafiltration filter is connected with a chemical pretreatment box, and the output end of the chemical pretreatment box is provided with a high-pressure pump; the output end of the high-pressure pump is sequentially connected with a first-stage reverse osmosis filter and a second-stage reverse osmosis filter, the output end of the second-stage reverse osmosis filter is connected with a post-treatment box, and the output end of the post-treatment box is connected with a produced water storage box. And the convenience of automatic cleaning and replacement in the seawater desalination pretreatment process is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sea water desalination technical field more specifically, it relates to a sea water desalination multistage reverse osmosis equipment. BACKGROUND

[0002] Sea water desalination is the process of converting seawater into fresh water through technical means, the main methods include reverse osmosis (RO), multistage flash distillation (MSF) and multiple effect distillation (MED), RO reverse osmosis is the most commonly used technology, using high pressure makes seawater pass through semi-permeable membrane, removes salt and impurities, obtains fresh water. Sea water desalination is widely used in water shortage areas, and provides stable water source for municipal water supply, industrial water and agricultural irrigation.

[0003] In the reverse osmosis treatment process of seawater, although the filter screen is arranged on the water inlet pipe to intercept floating objects and impurities, these floating objects are easy to accumulate and block the filter screen under the action of negative pressure adsorption, which affects the normal operation of the equipment. The prior art lacks effective automatic processing mechanism, so that the blockage problem needs to be cleaned manually frequently, which not only increases the maintenance cost, but also reduces the processing efficiency.

[0004] In the prior art, the ultrafiltration filter is often used for pretreatment before seawater reverse osmosis filtration to remove suspended solids and impurities. However, with the increase of use time, the ultrafiltration filter is easy to have blockage problem, which leads to the decrease of filtration efficiency, and even affects the stability of subsequent reverse osmosis treatment. The current technology lacks effective automatic cleaning mechanism, which needs to be disassembled and cleaned manually frequently, which not only increases the maintenance cost, but also reduces the operation efficiency of the equipment. TECHNICAL CONTENT

[0005] (I) Technical problem solved

[0006] In view of the problems existing in the prior art, the utility model provides a sea water desalination multistage reverse osmosis equipment to solve the technical problem that the water inlet pipe is easy to be blocked in the prior art mentioned in the background art.

[0007] (II) Technical scheme

[0008] To achieve the above purpose, the utility model provides the following technical scheme:

[0009] The application discloses a seawater desalination multi-stage reverse osmosis equipment, which comprises an inlet pipe, wherein the inlet end of the inlet pipe is provided with a filter screen, and a backflush pipe is arranged inside the inlet pipe and reversely faces the filter screen; the backflush pipe is connected with an external high-pressure water source, so that when floating impurities in seawater are adsorbed on the filter screen due to negative pressure at the inlet pipe, external water flow can be reversely sprayed on the filter screen through the backflush pipe under high pressure, so as to flush away the impurities adhered on the filter screen and ensure the smoothness of water inlet of the inlet pipe; the outlet end of the inlet pipe is connected with a sand filter, the outlet end of the sand filter is connected with an activated carbon filter, the outlet end of the activated carbon filter is connected with an ultrafiltration filter, and the outlet end of the ultrafiltration filter is connected with a chemical pretreatment box; the chemical pretreatment box can be used for adding acid to adjust pH and reduce pH of seawater before reverse osmosis filtration, so as to prevent salt such as calcium carbonate from being scaled; a scale inhibitor is added to prevent calcium sulfate, silicate and other difficultly soluble salts from being deposited on the membrane surface; a bactericide is added to inhibit the growth of microorganisms and prevent biological pollution; the outlet end of the chemical pretreatment box is provided with a high-pressure pump, the seawater after pretreatment is pressurized to meet the working pressure requirement of the reverse osmosis membrane, the outlet end of the high-pressure pump is sequentially connected with a first-stage reverse osmosis filter and a second-stage reverse osmosis filter, the outlet end of the second-stage reverse osmosis filter is connected with a post-treatment box, the post-treatment box can be used for adjusting pH of produced water by adding alkali or acid; ozone (O3) is used to disinfect the pretreated seawater and kill residual microorganisms; and the outlet end of the post-treatment box is connected with a produced water storage tank.

[0010] The application is further provided with a concentrated brine drainage pipe arranged on the first-stage reverse osmosis filter and the second-stage reverse osmosis filter, and an energy recovery device connected with the outlet end of the concentrated brine drainage pipe; the energy recovery device is preferably a turbine type energy recovery device or a pressure exchanger, which recovers the energy of high-pressure concentrated brine; the energy recovery device can be used in cooperation with an external device needing to be driven or with the high-pressure pump; if used in cooperation with the high-pressure pump, a high-pressure pump and energy recovery device integrated machine can be formed, for example, an RNTECH-Salion 250 type high-pressure pump and energy recovery device integrated machine product, which is used for recovering the energy of high-pressure concentrated brine after reverse osmosis filtration and improving energy utilization effect.

[0011] The ultrafiltration filter comprises a shell, an ultrafiltration membrane cover arranged on the shell, and an ultrafiltration membrane pipe arranged on the ultrafiltration membrane cover and fixedly connected between the bottom end of the ultrafiltration membrane pipe and the inner bottom end of the shell, so that the seawater is further pretreated before RO reverse osmosis through the ultrafiltration membrane pipe.

[0012] The utility model further sets up, be provided with electric push rod on the ultrafiltration membrane cover, the output of electric push rod is provided with scraper, the scraper is slidably sleeved on each ultrafiltration membrane pipe, and the scraper is located inside the shell, when the surface of ultrafiltration membrane pipe needs cleaning, start electric push rod, can make the scraper move on the surface of ultrafiltration membrane pipe through electric push rod, thereby realize the scraping cleaning of the surface of ultrafiltration membrane pipe, like this, can realize the automatic cleaning of ultrafiltration membrane pipe.

[0013] The utility model further sets up, the bottom of the lateral wall of shell is provided with drainage pipe, be provided with drainage valve on the drainage pipe, the impurity cleaned down can be discharged outward along with the drainage pipe, and the drainage valve is used for controlling the opening and closure of drainage pipe, preferably, the scraper adopts the combination of rubber and hard plate, and makes the stable fit between the lateral wall of scraper and the inner wall of shell, like this, can make the impurity scraped down can be more fully discharged by the drainage pipe.

[0014] The utility model further sets up, sand filter and active carbon filter all include the box, the inside tilt of box is provided with two layer spacing net board, spacing net board inside is provided with filler, wherein, the corresponding filler in sand filter is selected corresponding sand material for filtering, and the corresponding filler in active carbon filter box is active carbon particle.

[0015] The utility model further sets up, the top of the lateral wall of box is provided with feed inlet in cooperation with spacing net board, and the bottom is provided with discharge port in cooperation with spacing net board, the feed inlet and discharge port all can detachably be provided with sealing cover, when needing to replace the filler in sand filter and active carbon filter, can not need to open the box and detach, only need to stop water, and the sealing cover at feed inlet and discharge port is opened, can make the filler discharge from discharge port, and the new filler can be filled from feed inlet, thereby realize the quick and convenient replacement of internal filler.

[0016] The utility model further sets up, chemical pretreatment box and postprocessing box all include the conveying box, the inside of conveying box is provided with spiral conveying blade, the liquid inlet end of conveying box is provided with liquid inlet pipe, when carrying out chemical pretreatment and postprocessing after reverse osmosis, can convey the required treatment liquid or gas to the liquid inlet end in the inside of conveying box through liquid inlet pipe, after entering the inside of conveying box, the treatment liquid will flow along with the water flow, and the treatment liquid and water flow will automatically tumble and mix under the action of spiral conveying blade in the flowing process, improve the treatment effect and efficiency, reduce the stay due to treatment.

[0017] (Three) beneficial effects

[0018] Compared with the prior art, the utility model provides a kind of seawater desalination multistage reverse osmosis equipment, with following beneficial effects:

[0019] 1. The utility model discloses a filter screen is provided at the water inlet pipe, can remove larger suspended solids, such as seaweed, plastic fragments etc. through the filter screen, simultaneously, the utility model discloses in the inside cooperation of filter screen is provided with the backflush pipe, the backflush pipe is connected with the high pressure water source of outside, thereby when the floating impurity etc. in seawater is adsorbed at the filter screen because of the negative pressure of water inlet pipe, can make the outside water flow through the backflush pipe high pressure reverse spray to the filter screen, thereby the sundries adhered on the filter screen is washed away, guarantees the water inlet of water inlet pipe.

[0020] 2. The utility model discloses setting sand filter, activated carbon filter and ultrafiltration filter in proper order at the output end of liquid inlet pipe, like this, through sand filter, smaller suspended particles and colloidal substance are removed, through activated carbon filter, organic matter, residual chlorine and peculiar smell can be adsorbed, through ultrafiltration filter, further remove small particle and colloidal substance, as the pretreatment of reverse osmosis, protect RO membrane.

[0021] 3. The utility model discloses connecting chemical pretreatment box at the input end of primary reverse osmosis filter, and setting post-treatment box at the output end of secondary reverse osmosis filter, like this, through chemical pretreatment box, can add acid to adjust pH before reverse osmosis filtration, reduce the pH value of seawater, prevent calcium carbonate and other salts from scaling, add scale inhibitor to prevent calcium sulfate, silicate and other insoluble salts from depositing on the membrane surface, and add bactericide to inhibit microbial growth and prevent biological pollution, simultaneously, can add alkali or acid to adjust the pH value of water production through post-treatment box, add ozone to post-treatment box, use ozone (O3) to disinfect pretreated seawater and kill residual microorganisms. ACCURACY

[0022] Figure 1 It is whole structure schematic of a kind of seawater desalination multistage reverse osmosis equipment in the utility model Figure 1 ;

[0023] Figure 2 It is whole structure schematic of a kind of seawater desalination multistage reverse osmosis equipment in the utility model Figure 2 ;

[0024] Figure 3 It is position structure cross-sectional view between water inlet pipe and backflush pipe in the utility model;

[0025] Figure 4 It is internal structure cross-sectional view of sand filter and activated carbon filter in the utility model;

[0026] Figure 5 It is internal structure cross-sectional view of chemical pretreatment box and post-treatment box in the utility model;

[0027] Figure 6The utility model discloses longitudinal ultrafiltration filter internal structure cross section view schematic view.

[0028] In the drawing: 1, water inlet pipe;2, filter screen;3, backflush pipe;4, sand filter;5, activated carbon filter;6, ultrafiltration filter;7, chemical pretreatment box;8, high pressure pump;9, first reverse osmosis filter;10, second reverse osmosis filter;11, post-treatment box;12, water production storage tank;13, concentrated brine drain pipe;14, energy recovery device;15, shell;16, ultrafiltration membrane cover;17, ultrafiltration membrane pipe;18, electric push rod;19, scraper;20, liquid discharge pipe;21, liquid discharge valve;22, box;23, limiting screen;24, filler;25, feed inlet;26, discharge port;27, sealing cover;28, conveying box;29, spiral conveying blade;30, liquid inlet pipe. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.

[0030] It should be noted that all technical and scientific terms used in the present application have the same meaning as that generally understood by ordinary skilled in the art to which the present application belongs, unless otherwise specified.

[0031] In the present application, the directions such as "up, down" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions, unless otherwise specified. Similarly, for the convenience of understanding and description, "left, right" are generally directed to the left and right shown in the drawings, and "inner, outer" are directed to the inner and outer relative to the contour of each component, but the above direction words are not used to limit the present application.

[0032] Please refer to Figures 1-6 A seawater desalination multi-stage reverse osmosis equipment, including water inlet pipe 1, the water inlet end of water inlet pipe 1 is provided with filter screen 2, and the inside reverse direction of water inlet pipe 1 is provided with backflush pipe 3 towards filter screen 2, and backflush pipe 3 is connected with external high-pressure water source, so that when the floating impurities in seawater are adsorbed at filter screen 2 due to negative pressure at water inlet pipe 1, external water flow can be made to be high-pressure reverse sprayed towards filter screen 2 through backflush pipe 3, so as to wash away the sundries adhered on filter screen 2, and the water inlet flow of water inlet pipe 1 is ensured smooth;

[0033] The utility model discloses sand filter 4 is connected to the output end of water inlet pipe 1, and the output end of sand filter 4 is connected with activated carbon filter 5, and the output end of activated carbon filter 5 is connected with ultrafiltration filter 6;

[0034] The utility model discloses a chemical pretreatment box 7 is established at the output end of ultrafiltration filter 6, and the chemical pretreatment box 7 can add acid to adjust pH before reverse osmosis filtration, reduce the pH of seawater, prevent calcium carbonate and other salt scale formation, add scale inhibitor, prevent calcium sulfate, silicate and other insoluble salt deposition on the membrane surface and add bactericide, inhibit microbial growth and prevent biological pollution.

[0035] The utility model discloses a high pressure pump 8 is arranged at the output end of chemical pretreatment box 7, and the seawater after pretreatment is pressurized to meet the working pressure requirement of reverse osmosis membrane, and the output end of high pressure pump 8 is sequentially connected with first reverse osmosis filter 9 and second reverse osmosis filter 10, and the output end of second reverse osmosis filter 10 is connected with post-processing box 11, and post-processing box 11 can adjust the pH of produced water by adding alkali or acid, and ozone (O3) is used to disinfect the pretreated seawater and kill residual microorganisms.

[0036] The output end of post-processing box 11 is connected with produced water storage tank 12.

[0037] Please refer to Figures 1-6 As an embodiment of first reverse osmosis filter 9 and second reverse osmosis filter 10, concentrated brine drain pipe 13 is arranged on first reverse osmosis filter 9 and second reverse osmosis filter 10, the output end of concentrated brine drain pipe 13 is connected with energy recovery device 14, energy recovery device 14 preferably turbine type energy recovery device 14 or pressure exchanger recovers the energy of high pressure concentrated brine, energy recovery device 14 can be used with the equipment driven by the outside world or with high pressure pump 8, if with high pressure pump 8, high pressure pump 8 and energy recovery device integrated machine can be formed, for example, RNTECH-Salion 250 model high pressure pump 8 and energy recovery device integrated machine product, which is used for recovering the energy of high pressure concentrated brine after reverse osmosis filtration, improving energy utilization effect, and the output end of energy recovery device 14 can be connected with concentrated brine treatment system.

[0038] Please refer to Figures 1-6 As an embodiment of ultrafiltration filter 6, the ultrafiltration filter 6 includes shell 15, and the shell 15 is provided with ultrafiltration membrane cover 16, and the ultrafiltration membrane cover 16 is provided with ultrafiltration membrane pipe 17, so that the bottom end of ultrafiltration membrane pipe 17 is connected and fixed with the inside bottom end of shell 15, and the seawater is further pretreated before RO reverse osmosis through ultrafiltration membrane pipe 17.

[0039] Please refer to Figures 1-6As an embodiment of the ultrafiltration membrane cover 16: the ultrafiltration membrane cover 16 is provided with an electric push rod 18, the output end of the electric push rod 18 is provided with a scraper 19, the scraper 19 is sleeved on each ultrafiltration membrane tube 17, and the scraper 19 is located inside the shell 15, when the surface of the ultrafiltration membrane tube 17 needs to be cleaned, the electric push rod 18 is started, the scraper 19 can move on the surface of the ultrafiltration membrane tube 17 through the electric push rod 18, so that the surface of the ultrafiltration membrane tube 17 is scraped and cleaned, so that the automatic cleaning of the ultrafiltration membrane tube 17 can be realized.

[0040] Further, the utility model discloses a drain pipe 20 is provided at the bottom end of the lateral wall of the shell 15, the drain pipe 20 is provided with a drain valve 21, and the impurities cleaned can be discharged outward along the drain pipe 20, and the drain valve 21 is used for controlling the opening and closing of the drain pipe 20, preferably the scraper 19 adopts the combination of rubber and hard plate, and the lateral wall of the scraper 19 is stably attached to the inner wall of the shell 15, so that the impurities scraped can be more fully discharged by the drain pipe 20.

[0041] Please refer to Figures 1-6 As an embodiment of the sand filter 4: the sand filter 4 and the activated carbon filter 5 all include a box body 22, two layers of limiting net plates 23 are arranged in the box body 22, and the limiting net plates are provided with fillers 24, wherein the fillers 24 in the sand filter 4 correspond to sand for filtering, and the fillers 24 in the activated carbon filter correspond to activated carbon particles.

[0042] Please refer to Figures 1-6 As an embodiment of the box body 22: the top of the lateral wall of the box body 22 is provided with an inlet 25 matched with the limiting net plate, the bottom end of the limiting net plate is provided with a discharge port 26, the inlet 25 and the discharge port 26 are detachably provided with sealing covers 27, when the fillers 24 in the sand filter 4 and the activated carbon filter 5 need to be replaced, the box body 22 does not need to be opened and disassembled, only needs to stop water inflow, and the sealing covers 27 at the inlet 25 and the discharge port 26 are opened, so that the fillers 24 can be discharged from the discharge port 26 and new fillers 24 can be filled from the inlet 25, thereby realizing the quick and convenient replacement of the fillers 24.

[0043] Please refer to Figures 1-6As an embodiment of the chemical pretreatment tank 7 and the post-treatment tank 11: the chemical pretreatment tank 7 and the post-treatment tank 11 each comprise a conveying tank 28, the conveying tank 28 is internally provided with spiral conveying blades 29, and the conveying tank 28 is provided with a liquid inlet pipe 30 at a liquid inlet end; when chemical pretreatment and post-treatment after reverse osmosis are carried out, the required treatment liquid or gas can be conveyed to the liquid inlet end in the conveying tank 28 through the liquid inlet pipe 30; after the treatment liquid enters the conveying tank 28, the treatment liquid flows synchronously with the water flow; in the process of flowing, the treatment liquid and the water flow are automatically rolled and mixed under the action of the spiral conveying blades 29, so that the treatment effect and efficiency are improved, and the residence caused by treatment is reduced.

[0044] In summary:

[0045] The utility model discloses a filter screen 2 is set up at the water inlet pipe 1, can remove larger suspended solids such as seaweed, plastic fragments through the filter screen 2, and the utility model discloses a backflushing pipe 3 is matched with setting up in the filter screen 2, the backflushing pipe 3 is connected with the high pressure water source of outside, thereby when the floating impurity in seawater is adsorbed at the filter screen 2 due to the negative pressure of water inlet pipe 1, can make the outside water flow through the backflushing pipe 3 high pressure reverse spray to the filter screen 2, thereby the sundries adhered on the filter screen 2 are washed away, guarantee the water inlet flow of water inlet pipe 1 is smooth;

[0046] The utility model discloses sand filter 4, activated carbon filter 5 and ultrafiltration filter 6 are sequentially set up at the output end of liquid inlet pipe 30, like this, smaller suspended particles and colloidal material are removed through sand filter 4, can adsorb organic matter, residual chlorine and peculiar smell through activated carbon filter 5, further remove tiny particles and colloidal material through ultrafiltration filter 6, as the pretreatment of reverse osmosis, protect RO membrane;

[0047] The utility model discloses that the input end of primary reverse osmosis filter 9 is connected with chemical pretreatment tank 7, and the output end of secondary reverse osmosis filter 10 is provided with post-treatment tank 11, like this, can add acid and adjust pH before reverse osmosis filtration through chemical pretreatment tank 7, reduce the pH of seawater, prevent salt such as calcium carbonate from scaling, add scale inhibitor, prevent calcium sulfate, silicate and other difficultly soluble salt from depositing on the membrane surface and add bactericide, inhibit microbial growth and prevent biological pollution, can add alkali or acid and adjust the pH of water production through post-treatment tank 11, add ozone in post-treatment tank 11, use ozone (O3) to disinfect pretreated seawater, kill residual microorganism.

[0048] In all the above-mentioned solutions, the connection between the two components can be selected according to actual conditions, such as welding, bolt and nut connection, bolt or screw connection or other known connection modes, which will not be described here. In the above, when referring to the fixed connection, welding is preferred. Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and deformations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

[0049] In all the above-mentioned solutions, when referring to the operation of the electrical element, it is controlled by the controller unless otherwise specified. Since the controller is matched with common devices, its control principle and circuit connection belong to existing known and mature technologies, and the specific circuit structure will not be described here.

[0050] In all the above-mentioned solutions, when referring to the motor, it can be matched with a speed reducer if necessary. The connection structure and working principle between the motor and the speed reducer are existing known technologies, and the utility model will not be described here.

[0051] In all the above-mentioned solutions, when referring to the connection between the solar panel and the battery, it can be matched with an inverter, a battery charging controller, a cable, a fuse and a support, etc. The control principle and circuit connection belong to existing known and mature technologies, and the specific circuit structure will not be described here.

Claims

1. A multi-stage reverse osmosis apparatus for desalination of sea water comprising an inlet pipe (1) characterised in that: The water inlet pipe (1) is provided with a filter screen (2) at the water inlet end, a backflush pipe (3) is arranged inside the water inlet pipe (1) and faces the filter screen (2) in the opposite direction, a sand filter (4) is connected at the output end of the water inlet pipe (1), an activated carbon filter (5) is connected at the output end of the sand filter (4), an ultrafiltration filter (6) is connected at the output end of the activated carbon filter (5), a chemical pretreatment tank (7) is connected at the output end of the ultrafiltration filter (6), a high-pressure pump (8) is arranged at the output end of the chemical pretreatment tank (7), a primary reverse osmosis filter (9) and a secondary reverse osmosis filter (10) are sequentially connected at the output end of the high-pressure pump (8), a post-treatment tank (11) is connected at the output end of the secondary reverse osmosis filter (10), and a water production storage tank (12) is connected at the output end of the post-treatment tank (11).

2. A multi-stage reverse osmosis apparatus for desalination of sea water as claimed in claim 1 wherein: The primary reverse osmosis filter (9) and the secondary reverse osmosis filter (10) are both provided with a concentrated brine drain pipe (13), and the output end of the concentrated brine drain pipe (13) is connected with an energy recycler (14).

3. The apparatus according to claim 1, wherein: The ultrafiltration filter (6) comprises a shell (15), the shell (15) is provided with an ultrafiltration membrane cover (16), and the ultrafiltration membrane cover (16) is provided with an ultrafiltration membrane pipe (17).

4. A multi-stage reverse osmosis apparatus for desalination of sea water as claimed in claim 3 wherein: An electric push rod (18) is arranged on the ultrafiltration membrane cover (16), the output end of the electric push rod (18) is provided with a scraper (19), the scraper (19) is slidably sleeved on each ultrafiltration membrane pipe (17), and the scraper (19) is located inside the shell (15).

5. The apparatus according to claim 3, wherein: A drain pipe (20) is arranged at the bottom end of the side wall of the shell (15), and a drain valve (21) is arranged on the drain pipe (20).

6. A multi-stage reverse osmosis apparatus for desalination of sea water as claimed in any one of the claims 1 to 5 wherein: The sand filter (4) and the activated carbon filter (5) both comprise a box body (22), two layers of limiting mesh plates (23) are arranged inside the box body (22) in an inclined manner, and the limiting mesh plates (23) are provided with fillers (24) inside.

7. A multi-stage reverse osmosis apparatus for desalination of sea water as claimed in claim 6 wherein: A feed inlet (25) is arranged on the top of the side wall of the box body (22) in cooperation with the limiting mesh plates (23), a discharge outlet (26) is arranged at the bottom end of the side wall in cooperation with the limiting mesh plates (23), and a sealing cover (27) is detachably arranged at the feed inlet (25) and the discharge outlet (26).

8. The apparatus according to claim 1, wherein: The chemical pretreatment tank (7) and the post-treatment tank (11) both comprise a conveying tank (28), the conveying tank (28) is provided with a spiral conveying blade (29) inside, and a liquid inlet pipe (30) is arranged at the liquid inlet end of the conveying tank (28).

Images