CN104671351A - Sea water desalination system - Google Patents
Sea water desalination system Download PDFInfo
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- CN104671351A CN104671351A CN201410713831.3A CN201410713831A CN104671351A CN 104671351 A CN104671351 A CN 104671351A CN 201410713831 A CN201410713831 A CN 201410713831A CN 104671351 A CN104671351 A CN 104671351A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
Abstract
The invention provides a sea water desalination system which can restrain the concentration polarization in reverse osmosis membrane modules and can maintain the permeability of reverse osmosis membrane while reducing the electric power consumption during low-load operation. The sea water desalination system (100) comprises a high pressure pump (1) used for pressurizing sea water obtained through water fetching, reverse osmosis membrane modules (2) into which the sea water pressurized by the high pressure pump (1) is guided and which divide the sea water into infiltration water and concentrated water serving as high-concentration salt water, and a circulation pump (3) which pressurizes part of concentrated water discharged from the reverse osmosis membrane modules (2) and supplies water to the reverse osmosis membrane modules (2) via a circulation flow path (14). By using the circulation pump (3) to supply concentrated water corresponding to the reduction amount of a supply flow from the high pressure pump (1) to the reverse osmosis membrane modules (2), so that the concentration polarization is restrained.
Description
Technical field
The present invention relates to the seawater desalination system that the seawater obtained fetching water is separated into infiltration water and the condensed water as the salt solution of high density.
Background technology
As seawater desalination system, there will be a known the system be documented in patent documentation 1.The seawater desalination system be documented in patent documentation 1 has following structure: reverse osmosis membrane (Reverse Osmosis Membrane) is housed in the multiple reverse osmosis membrane modules in container by connection side by side, and only makes minority reverse osmosis membrane module work when underload.And, when only making minority reverse osmosis membrane module work, only the reverse osmosis membrane module expected be connected with high-pressure pump by being arranged on the opening and closing of each inflow side of reverse osmosis membrane module and the valve of outflow side, the rotating speed of control high-pressure pump reduces to make the output of high-pressure pump.This is because: when low load operation, reduce the output of high-pressure pump and reduce consumption of power, but in order to make whole reverse osmosis membrane module work, seawater flow is not enough.
Patent documentation 1: Japanese Laid-Open Patent Publication 63-72307 publication
Summary of the invention
Invent problem to be solved
In the structure of patent documentation 1, owing to reducing the output of high-pressure pump when low load operation and reducing power consumption, so the seawater flow flowing into each reverse osmosis membrane module reduces.Therefore, cause the concentration polarization on the face of reverse osmosis membrane, the growing amount as the fresh water of the infiltration water from reverse osmosis membrane module reduces.That is, the decline of the penetrating quality of reverse osmosis membrane module is caused.
The invention provides a kind of seawater desalination system, this seawater desalination system suppresses the concentration polarization in reverse osmosis membrane module, and also can reduce power consumption while the penetrating quality maintaining reverse osmosis membrane when low load operation.
For solving the scheme of problem
In order to solve above-mentioned problem, the feature of seawater desalination system of the present invention is to have: high-pressure pump, and described high-pressure pump is pressurizeed to the seawater obtained of fetching water; Reverse osmosis membrane module, described reverse osmosis membrane module imports the seawater after being pressurizeed by described high-pressure pump and is separated into the condensed water of infiltration water and the salt solution as high density; And recycle pump, the part of described recycle pump to the condensed water of discharging from described reverse osmosis membrane module is pressurizeed, and via reverse osmosis membrane module supply described in cycling stream road direction, utilize described recycle pump to supply the described condensed water corresponding with the reducing amount of the supply flow rate from described high-pressure pump to reverse osmosis membrane module.
The effect of invention
According to the present invention, a kind of concentration polarization suppressed in reverse osmosis membrane module can be provided, and also can reduce the seawater desalination system of power consumption when low load operation while the penetrating quality maintaining reverse osmosis membrane.
By the explanation of following embodiment, understand problem other than the above, structure and effect.
Accompanying drawing explanation
Fig. 1 is the one-piece construction figure of the seawater desalination system of one embodiment of the invention.
Fig. 2 is the schematic diagram of the concentration polarization represented on the face of the reverse osmosis membrane shown in Fig. 1.
Fig. 3 is the figure of the performance curve representing the high-pressure pump shown in Fig. 1.
Fig. 4 is the one-piece construction figure of the seawater desalination system of embodiments of the invention 2.
Fig. 5 is the one-piece construction figure of the seawater desalination system of embodiments of the invention 3.
Fig. 6 is the one-piece construction figure of the seawater desalination system of embodiments of the invention 4.
Fig. 7 is the one-piece construction figure of the seawater desalination system of embodiments of the invention 5.
Description of reference numerals
1 high-pressure pump, 2 reverse osmosis membrane modules, 3 recycle pumps, 4 relievers, 5 power recovery apparatus, 6 boosting pumps, 10 control device, 11,12,13,15,17 pipelines, 14,16 laterals, 20 reverse osmosis membranes, 100,101,102,103,104 seawater desalination systems
Embodiment
Below, use accompanying drawing that embodiments of the invention are described.
[embodiment 1]
Fig. 1 is the one-piece construction figure of the seawater desalination system of embodiments of the invention.Below, be described for situation processed water being set to seawater.Seawater desalination system 100 of the present invention comprises: the high-pressure pump 1 of pressurizeing to the seawater that obtains of fetching water, to be housed in by reverse osmosis membrane 20 and to be separated into fresh water in container and using the seawater after the pressurization of inflow and as the reverse osmosis membrane module 2 of the condensed water of high density salt solution, the recycle pump 3 being used for making a part for the condensed water of discharge to circulate to reverse osmosis membrane module 2, the reliever 4 reduced pressure to the condensed water of discharging from reverse osmosis membrane module 2 and the control device 10 controlling these parts.Reverse osmosis membrane 20 such as uses the manufacture of the starting material such as Mierocrystalline cellulose, polymeric amide, makes water by the minute aperture of reverse osmosis membrane by being applied above the pressure of the osmotic pressure of seawater, separate fresh and condensed water by the infiltration of suppression salinity.
In addition, seawater desalination system 100 has not shown pretreating device at the upstream side of high-pressure pump 1.As pretreating device, the seawater that storing fetches water obtains can be used also to pass through to add the impurity such as polymer coagulant or mineral-type agglutinant the organism contained in the seawater stirring and agglutinant seizure water intaking is obtained and the aggegation steel basin forming floss, pH adjusting agent throw-in part, from the seawater comprising floss flowed out from aggegation steel basin, floss is carried out to secondary filter film (the MF film of membrane sepn accordingly with the aperture size of film, Microfiltration Membrane: microfiltration membrane), ultra-filtration membrane (UF film: Ultrafiltration Membrane) etc.In addition, as polymer coagulant, such as, can use polyacrylamide agglutinant, as mineral-type agglutinant, such as, can use iron(ic) chloride etc.
In FIG, high-pressure pump 1, reverse osmosis membrane module 2, recycle pump 3 and reliever 4, utilize the pipeline 11 circulate to reverse osmosis membrane module 2 for the seawater that obtains of fetch water via high-pressure pump 1, the pipeline 13 circulated to reliever 4 for condensed water, from the branched halfway of pipeline 13 and the lateral 14 making a part for condensed water converge in the inflow side of the reverse osmosis membrane module 2 of pipeline 11 via recycle pump 3, the pipeline 15 supplying to utilize the post-decompression condensed water of reliever 4 to circulate and be provided as the pipeline 12 that the fresh water from the infiltration water of reverse osmosis membrane module 2 circulates and connect.And, utilize lateral 14 and recycle pump 3 to form the circulation stream that a part for condensed water is circulated to reverse osmosis membrane module 2.
Reliever 4 such as uses pressure regulator valve etc., in addition, reverse osmosis membrane module 2 in layeredly tying up the multiple reverse osmosis membrane 20 of collecting, between mutually adjacent reverse osmosis membrane 20, being formed and making to utilize high-pressure pump 1 to be pressurized to the passage of the seawater circulation of the pressure of the osmotic pressure exceeding seawater in container.
Here, the concentration polarization on the face of reverse osmosis membrane 20 is described.The schematic diagram of the concentration polarization on the face of reverse osmosis membrane shown in Figure 2.As shown in Figure 2, the high pressure sea water after utilizing high-pressure pump 1 to pressurize, is directed in the passage that is formed between adjacent reverse osmosis membrane 20.The high pressure sea water be imported into, through the face of reverse osmosis membrane 20, extracts fresh water as infiltration water.Therefore, the concentration of seawater on the face of reverse osmosis membrane 20 raises.When the pressure difference between reverse osmosis membrane 20 being set to Δ p, permeable pressure head being set to Δ π, face concentration is set to Cm, the flux Jv of infiltration water meets the relation of Jv=k (Δ p-Δ π (Cm)).
In addition, when face concentration being set to the salt concn (melting concn) in Cm, the seawater that circulates in passage is set to Cb, is set to Cp as the salt concn in the fresh water of infiltration water, the thickness of concentration boundary layer (concentration polarization layer) is set to δ, spread coefficient is set to D, meet following relation:
(Cm-Cp)/(Cb-Cp)＝exp(Jv·δ/D)。
Permeation flux Jv is less, and in addition, the thickness δ of concentration boundary layer is thinner, then more can reduce face concentration C m.
In addition, according to the relational expression of the flux Jv of above-mentioned infiltration water, permeation flux Jv is determined by the intermembranous pressure difference Δ p of reverse osmosis membrane 20 and the difference of permeable pressure head Δ π, but permeable pressure head Δ π determines primarily of the concentration of seawater on face and face concentration C m.Because face concentration C m is lower, then intermembranous pressure difference Δ p is less, so in order to obtain constant permeation flux Jv, as long as can reduce face concentration C m, can reduce the power of high-pressure pump 1.
On the other hand, as shown in above-mentioned relational expression, permeation flux Jv is less, then face concentration C m is retained as lower.When demand reduces the Production requirement amount of phase, i.e. fresh water low low load operation, this condition must be met.And for concentration boundary layer thickness δ (thickness of concentration polarization layer), work and keep face speed u by making recycle pump 3, comparatively unfertile land keeps concentration boundary layer thickness δ, and can prevent face concentration C m from increasing.Make a part for the condensed water of discharging from reverse osmosis membrane module 2 to reverse osmosis membrane module 2 circulation time when utilizing recycle pump 3, the condensed water making salt concentration high mixes with the high pressure sea water from high-pressure pump 1, therefore, the melting concn Cb of the seawater circulated in the passage between reverse osmosis membrane 20 increases.But because permeation flux Jv during low load operation reduces, and a part for the condensed water supplied by recycle pump 3 is mixed and circulate in passage, so can maintain face speed u, intermembranous pressure difference Δ p reduces.Thus, when low load operation, due to comparatively concentration boundary layer thickness δ can be maintained and inhibition concentration polarization, so can maintain the penetrating quality of reverse osmosis membrane module 2 by unfertile land.
Therefore, in the seawater desalination system 100 of the present embodiment, above-mentioned lateral 14 and recycle pump 3 can be utilized, form the circulation stream that a part for condensed water is circulated to reverse osmosis membrane module 2, and pressurizeed by high-pressure pump 1 and in the high pressure sea water flowed into reverse osmosis membrane module 2, mixing the part of condensed water, and supply to reverse osmosis membrane module 2, when low load operation, inhibition concentration can polarize and maintain the penetrating quality of reverse osmosis membrane module 2.
In addition, in FIG, to be pressurizeed by high-pressure pump 1 and the pressure of the high pressure sea water circulated in passage in above-mentioned reverse osmosis membrane module 2 is 50 atm higher, the condensed water of discharging from reverse osmosis membrane module 2, maintaining with the state of pressure when having been pressurizeed by high-pressure pump 1 being roughly the same pressure (49 atm higher), flows into recycle pump 3 via pipeline 13 and lateral 14.In addition, the fresh water as the infiltration water from reverse osmosis membrane module 2 taken out via pipeline 12 is roughly equal with normal atmosphere, is an atm higher.Therefore, in recycle pump 3, boosting is that an atm higher is just much of that, compared with high-pressure pump 1, can reduce the lift of recycle pump 3.In FIG, pipeline 11,13,14, the region covered with dotted line of recycle pump 3 and reverse osmosis membrane module 2 is for high-pressure area.
Here, the running of high-pressure pump 1 is described.Figure 3 illustrates use turbo-pump as high-pressure pump 1 when performance curve.Transverse axis is the delivery flow Q of high-pressure pump 1, the longitudinal axis is lift H, the efficiency eta of high-pressure pump 1, the curve H1 represented with solid line represents the Q-H curve during rated load running of high-pressure pump 1, and the curve H2 be represented by dotted lines represents Q-H curve when fresh water demand minimizing phase and low load operation.In addition, the Q-η curve when curve η 1 represented with solid line represents that rated load operates, the curve η 2 be represented by dotted lines represents Q-η curve during low load operation.
In turbo-pump, there is following characteristic: lift H and efficiency eta are determined by delivery flow Q and rotational speed omega, delivery flow Q and rotational speed omega proportional, lift H and rotational speed omega square proportional.When operating at the peak value of pump efficiency, making delivery flow Q reduce pro rata with rotational speed omega, square lift H being reduced with rotational speed omega.
The pump performance curve shown in this Fig. 3 preserved by control device 10 shown in Fig. 1 in not shown storage part, and according to the demand (output) of fresh water, controls the rotational speed omega of high-pressure pump 1 based on this performance curve.Control device 10 carries out running by the rotational speed omega of the high-pressure pump 1 corresponding with the A1 on Q-H curve H1 and controls, and makes the delivery flow of high-pressure pump 1 corresponding to fresh water demand when operating with rated load become Q1.Now, when fresh water demand reduces and the delivery flow of high-pressure pump 1 reduces from Q1 to Q2, the running carried out with the rotational speed omega of the high-pressure pump 1 corresponding with the A2 on Q-H curve H2 during low load operation is switched to control.Now, the flow of the high pressure sea water circulated in the passage in above-mentioned reverse osmosis membrane module 2 reduces.Thus, as illustrated in fig. 2, carry out only utilizing high-pressure pump 1 in the water supply of reverse osmosis membrane module 2, in layeredly being declined by the face speed u of the high pressure sea water circulated in the passage between the reverse osmosis membrane 20 of accommodating, intermembranous pressure difference Δ p increases, and face concentration C m increases.In the present embodiment, utilize recycle pump 3 to supply a part for the condensed water of discharging from reverse osmosis membrane module 2 to reverse osmosis membrane module 2 via pipeline 14, the amount of a part for described condensed water is corresponding with the reduction (Q1-Q2) of the delivery flow of high-pressure pump 1.Thereby, it is possible to maintain the face speed u in the passage between reverse osmosis membrane 20, reduce intermembranous pressure difference Δ p, and can inhibition concentration polarization.B state shown in this state with Fig. 3, namely to maintain the state of flow by increasing recirculated water corresponding.In addition, in pipeline 13 circulation condensed water in, as recirculated water use condensed water beyond condensed water, be discharged after carrying out pressure adjusting by reliever 4.In addition, read the observed value from pressure warning unit not shown in Fig. 1, under meter and perform the above-mentioned control of control device 10.Such as, based on from the pressure warning unit be arranged in the pipeline 11 of the circulation of the high pressure sea water after being pressurizeed by high-pressure pump 1 and under meter, the observed value being arranged on pressure warning unit in lateral 14 and under meter, controlled circulation pump 3.
Like this, in the present embodiment, with the minimizing of fresh water demand accordingly, adjust the amount of the recirculated water supplied via the cycling stream road direction reverse osmosis membrane module 2 formed by recycle pump 3 and pipeline 14.Namely, when fresh water demand reduces, with recycle pump 3 to condensed water corresponding to the reduction of reverse osmosis membrane module 2 supply and demand amount, thus will the fetch water feed rate of the seawater as processed water obtained of high-pressure pump 1 be utilized to be set to the difference of the internal circulating load of the condensed water being only recycle pump 3, thus, the flow flowed into reverse osmosis membrane module 2 is maintained constant, and the power consumption of high-pressure pump 1 can be reduced.
In addition, by the influx of the high pressure sea water flowed into reverse osmosis membrane module 2 is set to constant, inhibition concentration can polarize, and the running corresponding to fresh water demand can be carried out while the penetrating quality maintaining reverse osmosis membrane module 2.
[embodiment 2]
The one-piece construction figure of the seawater desalination system of embodiments of the invention 2 shown in Figure 4.For the textural element identical with the textural element of the seawater desalination system 100 shown in Fig. 1, mark identical Reference numeral.The seawater desalination system 101 of the present embodiment adopts the structure connecting multiple reverse osmosis membrane module 21 ~ 2N side by side, and this point is different from embodiment 1.
Open and close valve m1 ~ mN is set in the inflow side of each reverse osmosis membrane module 21 ~ 2N, in addition, open and close valve 11 ~ 1N is set respectively in the outflow side of reverse osmosis membrane module.Be constructed as follows structure: utilize these open and close valves, the reverse osmosis membrane module of expectation can be made to be separated from running condition, scavenging solution is circulated to inflow side from outflow side, and clean the reverse osmosis membrane 20 in (back washing) reverse osmosis membrane module.
As described in Example 1, when fresh water demand reduces, low load operation time, control device 10 controlled circulation pump 3 is also to reverse osmosis membrane module supply recirculated water.With the reduction of the delivery flow from high-pressure pump 1 correspondingly, from a part for the condensed water that reverse osmosis membrane module 21 ~ 2N discharges, supply to recycle pump 3 via lateral 14, boost into the pressure identical with the pressure of the high pressure sea water circulated in pipeline 11, mix with the high pressure sea water from high-pressure pump 1 and be supplied to reverse osmosis membrane module 21 ~ 2N.Thus, when fresh water demand reduces, also can under the state making multiple reverse osmosis membrane module 21 ~ 2N work, maintain flow into each reverse osmosis membrane module, high pressure sea water mixes the water yield with condensed water, the face speed u in the passage between reverse osmosis membrane 20 can be maintained, and the concentration polarization in multiple reverse osmosis membrane module 21 ~ 2N can be suppressed.
According to the present embodiment, when low load operation also without the need to reducing the quantity of the reverse osmosis membrane module of work, that is, can low load operation be carried out under the state making remaining reverse osmosis membrane module work, similarly can maintain the state of each reverse osmosis membrane module.
In addition, in the present embodiment, also can operate according to fresh water demand while maintaining penetrating quality at the concentration polarization suppressed in reverse osmosis membrane module.
[embodiment 3]
The one-piece construction figure of the seawater desalination system of embodiments of the invention 3 shown in Figure 5.Identical Reference numeral is marked for the textural element identical with the textural element shown in Fig. 4.The seawater desalination system 102 of the present embodiment has power recovery apparatus 5 and boosting pump 6, and this point is different from embodiment 2.
As shown in Figure 5, in the seawater desalination system 102 of the present embodiment, from the condensed water that multiple reverse osmosis membrane module 21 ~ 2N discharges, be imported into power recovery apparatus 5 via pipeline 13.In addition, a part for the seawater obtained of fetching water, supplies to power recovery apparatus 5 via lateral 16.Power recovery apparatus 5 utilizes discharges and the pressurized condensed water imported via pipeline 13 from reverse osmosis membrane module, pressurizes to the seawater imported via lateral 16.The seawater pressurizeed by power recovery apparatus 5, flows through pipeline 17 and converges with pipeline 11.In pipeline 17, be provided with boosting pump 6, the seawater boosting of having been boosted by power recovery apparatus 5 is the degree identical with the pressure of the seawater pressurizeed by high-pressure pump 1 by boosting pump 6.Here, as power recovery apparatus 5, such as, use displacement type ram pump etc.Import power recovery apparatus 5 via pipeline 13 and carry out the condensed water after pressure transmission to the seawater that the water intaking imported via lateral 16 obtains, discharging via pipeline 15.
In the present embodiment, when low load operation, mix from the recirculated water (part from the condensed water that reverse osmosis membrane module is discharged) of the high pressure sea water of high-pressure pump 1, recycle pump 3 and the part of seawater that obtains via the water intaking that power recovery apparatus 5 has been boosted by boosting pump 6, supply to multiple reverse osmosis membrane module 21 ~ 2N.Thereby, it is possible to maintain the face speed u of the mixing water of circulation in each reverse osmosis membrane module and inhibition concentration polarization.Thus, while the penetrating quality maintaining each reverse osmosis membrane module, low load operation can be carried out under the state making remaining reverse osmosis membrane module work.In addition, when low load operation, when reducing the rotating speed that reduces power recovery apparatus 5 accordingly with the delivery flow of high-pressure pump 1 or arrange power recovery apparatus 5 accordingly with each reverse osmosis membrane module, the work number of units of power recovery apparatus 5 is reduced.
According to the present embodiment, except the effect of embodiment 2, by arranging power recovery apparatus 5, power consumption can be reduced further.
[embodiment 4]
The one-piece construction figure of the seawater desalination system 103 of the present embodiment shown in Figure 6.For the textural element identical with the textural element shown in Fig. 4, mark identical Reference numeral.In the present embodiment, have multiple reverse osmosis membrane modules that secondary connects side by side, this point is different from embodiment 2.
As shown in Figure 6, on the basis of the structure of Fig. 4, be provided with: the pump 1' that the condensed water flowed out from the multiple reverse osmosis membrane module 21 ~ 2N connected side by side is forced into the pressure exceeding osmotic pressure, multiple reverse osmosis membrane module 21' ~ 2N' that the condensed water of having pressurizeed is imported into, import the condensed water flowed out from reverse osmosis membrane module 21' ~ 2N' via pipeline 14' a part and the 2nd recycle pump 3' being forced into the pressure identical with the pressurized water utilizing pump 1' to carry out pressurizeing, reliever 4 that the condensed water circulated among pipeline 13' is reduced pressure.
Be constructed as follows structure: the condensed water flowed out by the reverse osmosis membrane module 21 ~ 2N from the first step, import the reverse osmosis membrane module 21' ~ 2N' being configured at the second stage of its rear stage, and produce the fresh water as infiltration water by two-stage.
As mentioned above, because the condensed water of reverse osmosis membrane module 21' ~ 2N' flowing into the second stage is retained as the pressure of the seawater that the water intaking of having pressurizeed with the high-pressure pump 1 by the first step obtains roughly with the pressure of degree, so pump 1' can use lift lower than the pump of the lift of the high-pressure pump 1 of the first step.That is, in the reverse osmosis membrane module of the second stage, the structure of the back pressure of the reverse osmosis membrane module that can utilize the first step is become.In addition, because in the reverse osmosis membrane module of the first step with the second stage, pressure rating is different, so arrange recycle pump 3 and recycle pump 3' respectively.
In the present embodiment, under the state that also can make remaining reverse osmosis membrane module work when low load operation, while inhibition concentration polarizes and maintains penetrating quality, reduce power consumption.
[embodiment 5]
The one-piece construction figure of the seawater desalination system 104 of the present embodiment shown in Figure 7.Identical Reference numeral is marked for the textural element identical with the textural element shown in Fig. 4.
The high-pressure pump 1 of the seawater desalination system 104 of the present embodiment adopts following structure: connect multiple turbo-pump side by side and pressurize to the seawater obtained of fetching water.In turbo-pump, flow and rotating speed proportional, lift and rotating speed square proportional.Therefore, be difficult to control flow and pressure independently.For this reason, in the present embodiment, be constructed as follows structure: high-pressure pump 1 is set side by side, reduce the work number of units of rotating speed and pump when low load operation, and flow and pressure are reduced.
In the present embodiment, also low load operation can be carried out while maintaining penetrating quality at the concentration polarization suppressed in multiple reverse osmosis membrane module.
In addition, the present invention is not limited to above-described embodiment, comprises various variation.Such as, in order to easy understand the present invention is described and describes above-described embodiment in detail, but be not limited to that there is the entire infrastructure illustrated.In addition, a part for the structure of certain embodiment can be replaced to the structure of other embodiments, in addition, also can add the structure of other embodiments in the structure of certain embodiment.In addition, for a part for the structure of each embodiment, can add, delete, replace the structure of other embodiments.
Claims (7)
1. a seawater desalination system, is characterized in that, has:
High-pressure pump, described high-pressure pump is pressurizeed to the seawater obtained of fetching water;
Reverse osmosis membrane module, described reverse osmosis membrane module imports the seawater after being pressurizeed by described high-pressure pump, and is separated into the condensed water of infiltration water and the salt solution as high density; And
Recycle pump, the part of described recycle pump to the condensed water of discharging from described reverse osmosis membrane module is pressurizeed, and via reverse osmosis membrane module supply described in cycling stream road direction,
Described recycle pump is utilized to supply the described condensed water corresponding with the reducing amount of the supply flow rate from described high-pressure pump to reverse osmosis membrane module.
2. seawater desalination system according to claim 1, is characterized in that,
Described circulation pump lift is retained as lower than described high pressure pump lift.
3. seawater desalination system according to claim 1, is characterized in that,
The multiple described reverse osmosis membrane module of connection arranged side by side, each reverse osmosis membrane module can via valve and described high-pressure pump conducting,
Corresponding with the reducing amount of the feed rate from described high-pressure pump, utilize the condensed water that described recycle pump is discharged to described multiple reverse osmosis membrane module supply from described multiple reverse osmosis membrane module.
4. seawater desalination system according to claim 3, is characterized in that,
Described seawater desalination system has:
Power recovery apparatus, the part that described power recovery apparatus imports the seawater obtained of fetching water and the condensed water of discharging from described multiple reverse osmosis membrane module, and the pressure of described condensed water is transmitted to the seawater that this has been imported into; And
Boosting pump, described boosting pump the seawater after utilizing described power recovery apparatus to carry out pressure transmission is boosted into pressurizeed by described high-pressure pump after the pressure of seawater roughly equal,
Seawater after mixing utilizes described boosting pump to boost, pressurizeed by described high-pressure pump after seawater and condensed water from described recycle pump, and to described multiple reverse osmosis membrane module supply.
5. seawater desalination system according to claim 3, is characterized in that,
Described seawater desalination system has:
2nd high-pressure pump, described 2nd high-pressure pump is pressurizeed to the condensed water of discharging from the described multiple reverse osmosis membrane modules connected side by side;
Multiple 2nd reverse osmosis membrane modules of connection arranged side by side, described multiple 2nd reverse osmosis membrane module imports the condensed water after being pressurizeed by described 2nd high-pressure pump, and is separated into the condensed water of infiltration water and the salt solution as high density; And
2nd recycle pump, the part of described 2nd recycle pump to the condensed water of discharging from described 2nd reverse osmosis membrane module is pressurizeed, and via the 2nd reverse osmosis membrane module supply described in cycling stream road direction.
6. seawater desalination system according to claim 3, is characterized in that,
There is high-pressure pump described in the multiple stage connected arranged side by side, according to the demand of described infiltration water, control the operating number of described high-pressure pump or the rotating speed of each described high-pressure pump.
7. the seawater desalination system according to any one of claim 1 to claim 6, is characterized in that,
By to the described reverse osmosis membrane module supply described condensed water corresponding with the reducing amount of the supply flow rate from described high-pressure pump, the flow velocity of the mixing water of the seawater after the described pressurization of circulating in described reverse osmosis membrane module and described condensed water is maintained the value of regulation.
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| CN109843416A (en) * | 2016-08-30 | 2019-06-04 | 野村微科学股份有限公司 | The operation method of reverse osmosis membrane treatment system and reverse osmosis membrane treatment system |
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| JP2015104710A (en) | 2015-06-08 |
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