CN101782095A - Differential energy recovery device and method for seawater desalination system - Google Patents
Differential energy recovery device and method for seawater desalination system Download PDFInfo
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Abstract
The invention discloses a differential energy recovery device and a method for a seawater desalination system. The differential energy recovery device comprises two hydraulic cylinders connected in parallel. A piston divides each hydraulic cylinder into two cavities. The piston is fixedly connected with a piston rod. A low-pressure raw water inlet is connected with two left cavities through liquid inlet valves. The left cavities are connected with a high-pressure raw water outlet through liquid drain valves. Two right cavities are connected with reversing valves. The reversing valves are connected with a high-pressure concentrated water inlet and are connected with a low-pressure concentrated drain outlet. The method is that high-pressure concentrated water coming from a reverse osmosis device is enabled to enter the right cavities of the two hydraulic cylinders through the reversing valves, and low-pressure raw water in the left cavities is pushed and pressurized to enter the reverse osmosis device. Since the direct pressurization principle of the hydraulic cylinders is used for the special design, one-time energy conversion is adopted and the pressure of high-pressure seawater after pressure exchange is larger than the pressure of concentrated saline water, the invention has the advantages that the pressurizing pumps are not required for pressurization once more, the energy conversion efficiency is high, the operating cost is saved and the energy consumption of the reverse osmosis system is further reduced.
Description
Technical field
The present invention relates to the desalination of sea water field, specifically, relate to a kind of differential energy recovery device and the method for reverse osmosis seawater desalination system.
Background technique
An important goal of desalination technology development is to reduce operating cost, and the shared proportion maximum of energy consumption in the formation of operating cost is to reduce the most effective means of desalination of sea water cost so cut down the consumption of energy.Reverse osmosis seawater desalting is one of mainstream technology of present desalination of sea water, the reverse osmosis seawater desalting process need consume a large amount of electric energy and promote intake pressure to overcome the osmotic pressure of water, the dense water overbottom pressure that reverse osmosis membrane is discharged is up to 5.5～6.5MPa, the recovery rate according to 40% is calculated, also contain about 60% feed water pressure energy in the brine of discharging, this part energy reclaimed become the energy consumption that water energy into can significantly reduce reverse osmosis seawater desalting, and this purpose realizes depending on the energy recovery technology of utilizing.
Since the seventies, along with reverse osmosis technology is applied to seawater/brackish water desalination, various forms of energy recycle devices also occur in succession.Energy recycle device has hydraulic turbine formula energy recycle device and Work-exchange type energy recovery device two big classes at present.
Energy recycle device the earliest is the hydraulic turbine formula, the Pelton Wheel turbine engine of Switzerland Calder.AG company and the Francis turbine engine of PumpGinard company, efficient is generally 50%-70%, its principle is to utilize brine to drive turbine rotation, link to each other with motor with pump by axle, to the former seawater of charging, process need is through " water pressure energy---mechanical energy---water pressure energy " two steps conversion with energy transport.Through improving, some unique design occurred on the superincumbent basis, the wherein representative BMET turbine that has Denmark Grundfos company to produce directly drives the HydraulicTurbocharger of pump and the production of U.S. PEI company.Both all are turbine and pump integrated design, and a rotating shaft connects two impellers, all are encapsulated in the housing, impact blade when brine flows through impeller and promote wheel rotation, thereby drive the turbine spindle rotation.Turbine spindle directly drives suction booster work output mechanical work, and dense water transformation of energy becomes the energy conversion efficiency of former seawater can be increased to 65%-80%.High-pressure service pump and turbine suction booster two-stage series connection are finished the boost in pressure of former seawater, reduce the needed lift of high-pressure service pump by the turbine supercharging, reduce motor power consumption.But, owing to all will increase the mechanical energy loss, so efficient be lower on the hydraulic turbine formula energy recycle device principle through " water pressure energy---mechanical energy---water pressure energy " two steps conversion.
The eighties, a kind of new energy recovery technology has appearred, its working principle is " merit exchange ", by interface or spacer, directly give the charging seawater propagation of pressure of high-pressure thick salt solution, process obtains simplifying, and only needs through " water pressure energy---water pressure energy " step transformation of energy, and energy recovery efficiency can be improved.The Work-exchange type energy recovery device of using in the reverse osmosis seawater desalting engineering is mainly rotator type pressure exchanger and piston valve governor pressure exchanger two classes at present, and efficient can be up to 90-97%.
The rotator type pressure exchanger is representative with the PX rotator type pressure exchange energy reclaiming device of U.S. ERI company.Principle is that high-pressure thick salt solution promotes the no axle ceramic rotor rotation that circumference has a plurality of longitudinal grooves (being similar to a plurality of miniature fluid cylinders), static thrust plate zone of high pressure and low pressure area replaces the conversion incision in both sides respectively to make a plurality of microchannels, the miniature fluid cylinder that enters the zone of high pressure carries out the energy recovery transmission to exterior liquid, the miniature fluid cylinder that enters low pressure area carries out former seawater fluid infusion, PX need add press pump and promote the former seawater tentatively boost and enter the RO system, high-pressure thick salt solution directly with the former seawater transmission of low pressure pressure.On the one hand, increase pump owing to must be equipped with, rotator type pressure exchanger cost is than higher; On the other hand, rotor rotate sharp ear-piercing, noise is big, in case enter bubble, impurity etc. in the rotor, just be very easy to be damaged, poor reliability,
Piston valve governor pressure exchanger is representative with the SalTec DT pressure exchanger of the two merit exchange energy reclaiming devices of the DWEER of Switzerland Calder.AG company, German KSB company, the PES pressure-exchange system of German Siemag Transplan company and the DYPREX power pressure exchanger of Ionics company.Principle is to adopt two major diameter fluid cylinders, the dense water of one of them fluid cylinder mesohigh promotes piston and gives the former seawater of low pressure to exterior liquid energy transfer, charging pump is pressed into the former seawater fluid infusion of low pressure and discharges low-press thick water in another fluid cylinder, two fluid cylinders are alternately arranged under the control of PLC and dense water selector valve and are mended seawater, realize dense water transformation of energy is become the callback course of former seawater energy.Piston valve governor pressure exchanger need be equipped with suction booster and promote the former seawater tentatively boost and enter the RO system, and suction booster need adopt the material of seawater corrosion resistance, and also very high to seal request, buys by the import mode at present, and cost is very high.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of defective that can remedy prior art, reclaim the differential energy recovery device and the method for reverse osmosis seawater desalting high-pressure thick salt solution overbottom pressure energy, in order to promote the pressure of the former seawater of low pressure, finish two kinds of energy interchanges between the high low pressure liquid, realize the purpose of energy saving.
In order to solve the problems of the technologies described above, energy recycle device of the present invention is achieved by following technological scheme:
A kind of differential energy recovery device that is used for seawater desalination system, comprise the low pressure original water inlet that is connected in low pressure raw water pump water outlet, be connected in the former water out of high pressure of high pressure raw water pump water outlet, be connected in the high-pressure thick water inlet of reverse osmosis unit high-pressure thick water water outlet, comprise that also identical inside is provided with first fluid cylinder and inner second fluid cylinder that is provided with second piston of first piston, described first piston is divided into first cavity and second cavity with described first fluid cylinder, described first piston is connected with the first piston bar, described second piston is divided into the 3rd cavity and the 4th cavity with described second fluid cylinder, and described second piston is connected with second piston rod;
Described low pressure original water inlet connects described first cavity by the first feed liquor valve, and described first cavity connects the former water out of described high pressure by first liquid discharging valve, and described second cavity is connected in two position-5 way valves;
Described low pressure original water inlet connects described the 3rd cavity by the second feed liquor valve, and described the 3rd cavity connects the former water out of described high pressure by second liquid discharging valve, and described the 4th cavity is connected in two position-5 way valves;
Described two position-5 way valves are connected in the high-pressure thick water inlet, and are connected with the low-press thick water outlet.
As optimized technical scheme comparatively:
Described two position-5 way valves drive by the selector valve drive unit.
Described selector valve drive unit is wherein a kind of of fluid pressure drive device, actuating device of atmospheric pressure or electric energy drive unit.
Described selector valve drive unit is a fluid pressure drive device.
The high-pressure thick water out place of described reverse osmosis unit is provided with buffer.
Described first piston bar and described second piston rod are separately installed with sleeve, and described sleeve is provided with limit sensors.
Described first piston bar bar directly is 25%～40% of a described first piston diameter, and the described second piston rod bar directly is 25%～40% of described second piston diameter.
The described first feed liquor valve, the second feed liquor valve, first liquid discharging valve, second liquid discharging valve are respectively conical surface seal.
Energy reclaiming method of the present invention is achieved by following technological scheme:
A kind of differential type energy reclaiming method that is used for seawater desalination system that utilizes said apparatus to realize, form by following steps successively:
A. the selector valve drive unit transfers to position one with two position-5 way valves, makes second cavity and the high-pressure thick water inlet UNICOM of first fluid cylinder, the 4th cavity of second fluid cylinder and low-press thick water outlet UNICOM;
B. make the former water of low pressure feed the low pressure raw water pump, once pressurize;
C. the former water of low pressure after once pressurizeing enters first cavity of high pressure raw water pump, first fluid cylinder and the 3rd cavity of second fluid cylinder respectively by the former water out of low pressure;
D. the former water of low pressure that enters the high pressure raw water pump enters reverse osmosis unit after by the secondary pressurization, discharges low pressure fresh water and high-pressure thick water;
E. high-pressure thick water enters second cavity of first fluid cylinder by two position-5 way valves, promote the motion of first piston and first piston bar, the pressurization of the former water of once pressurization in first cavity is discharged, and converge with the former water of the high pressure of the former water out of high pressure and to enter reverse osmosis unit;
F. work as first piston and move to spacing position, feedback by limit sensors, the selector valve drive unit transfers to position two with two position-5 way valves, makes second cavity and the low-press thick water outlet UNICOM of first fluid cylinder, the 4th cavity of second fluid cylinder and high-pressure thick water inlet UNICOM;
G. high-pressure thick water enters the 4th cavity of second fluid cylinder by two position-5 way valves, promote second piston and second piston rod movement, the former water pressurization of once pressurization in the 3rd cavity is discharged, and converge with the former water of the high pressure of the former water out of high pressure and to enter reverse osmosis unit, the former water of once pressurization in first cavity promotes first piston and the motion of first piston bar simultaneously, and the low-press thick water in second cavity is discharged;
H. arrive spacing position when second piston motion, by the feedback of limit sensors, the selector valve drive unit transfers to position one with two position-5 way valves;
I. high-pressure thick water enters second cavity of first fluid cylinder by two position-5 way valves, promote the motion of first piston and first piston bar, the former water pressurization of once pressurization in first cavity is discharged, and converge with the former water of the high pressure of the former water out of high pressure and to enter reverse osmosis unit, the former water of once pressurization in the 3rd cavity promotes second piston and second piston rod movement simultaneously, and the low-press thick water in the 4th cavity is discharged;
J. after this circulation is carried out step (f) to step (i).
The invention has the beneficial effects as follows:
(1) adopt the direct supercharging principle of fluid cylinder to carry out particular design, adopt the primary energy conversion, the high pressure sea water pressure after the process pressure-exchange is greater than brine pressure, do not need suction booster supercharging once more, the energy conversion efficiency height has been saved operating cost, has further reduced the energy consumption of counter-infiltration system.
(2) because piston is connected with the piston rod with certain cross-sectional area, make pressure in the inner former seawater of the fluid cylinder chamber always greater than the pressure in the brine chamber, fundamentally avoided the leakage of brine to former seawater, the increase of film seawater salinity causes the problem that the desalination energy consumption additionally increases owing to brine causes into to former seawater seepage to have solved import merit exchange energy reclaiming device.
(3) adopt the electromechanical integration control technique, control two synchronisms that the fluid cylinder inner carrier moves, and piston moves the synchronism that commutates with two position-5 way valves, reduce the pressure surge that pressure-exchange causes owing to the high low pressure conversion, thereby the mechanical failure of avoiding " water hammer " water hammer that film is caused, improved the reliability of energy recycle device simultaneously, device can steadily reliably over a long time be turned round.
(4) design hydraulically powered two five-way valves and tubular type flow-distributing valve be as one-way valve, and one-way valve is conical surface seal, replaces high-pressure air operated valve or mortor operated valve, improved the stationarity and the reliability of device, reduced cost.
(5) at the high-pressure thick water out place of reverse osmosis unit buffer is installed, the further pressure surge of abatement system.
(6) on piston rod, be provided with sensor, monitor, feed back and regulate and control the motion state and the position of piston at any time, so that whole device is carried out the optimization debugging by sleeve.
(7) on the energy recycle device detection platform, carry out simulation test, test relevant performance parameter, on the reverse osmosis seawater desalting all-around test stand, carry out actual coupling test with high-pressure service pump and reverse osmosis membrane, adorning 6 seawater reverse osmosis membranes with the most frequently used in an engineering pressurized container is baseline configuration equipment, the design recovery rate 40%, the energy recycle device flow of coupling is 120m
3/ d, the result shows that energy recovery efficiency is greater than 90%.
Description of drawings
Fig. 1 is the structural representation of differential energy recovery device of the present invention;
Fig. 2 is position one phase diagram of differential type energy reclaiming method of the present invention;
Fig. 3 is the position two-state figure of differential type energy reclaiming method of the present invention.
---the former water out of 1 high pressure---2 first liquid discharging valve---3 among the figure: the low pressure original water inlet
The first feed liquor valve---4 first piston bars---5 first fluid cylinder---6
First cavity---7 first pistons---8 second cavity---9
High-pressure thick water inlet---10 low-press thick water outlets---11 liang of position-5 way valves---12
The 4th cavity---13 second fluid cylinders---14 second piston---15
The 3rd cavity---16 second piston rods---17 second feed liquor valve---18
Second liquid discharging valve---19 low pressure raw water pumps---20 former water inlet---21
High pressure raw water pump---22 reverse osmosis units---23 water outlet---24
Buffer---25 selector valve drive unit---26
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
Seawater desalination system comprises that being provided with former water goes into 21 low pressure raw water pump 20, the water outlet of described low pressure raw water pump 20 is connected in the water inlet of high pressure raw water pump 22 by low pressure original water inlet 1, and described high pressure raw water pump 22 is connected on the reverse osmosis unit 23 by the former water out 2 of high pressure.Reverse osmosis unit 23 inside go out high-pressure thick water by reverse osmosis membrane filtration, and what see through reverse osmosis membrane is fresh water, and fresh water is collected by water outlet 24.
The invention discloses a kind of differential energy recovery device that is used for seawater desalination system, and the differential type energy reclaiming method that utilizes said apparatus to realize.
As shown in Figure 1, differential energy recovery device comprises first fluid cylinder 6 identical and in parallel and second fluid cylinder 14, described first fluid cylinder 6 inside are provided with first piston 8, described first piston 8 is divided into first cavity 7 and second cavity 9 with first fluid cylinder 6, and described first piston 8 is connected with first piston bar 5.Same, described second fluid cylinder 14 inside are provided with second piston 15, and described second piston 15 is divided into the 3rd cavity 16 and the 4th cavity 13 with second fluid cylinder 14, and described second piston 15 is connected with second piston rod 17.
Described first piston bar 5 bars directly are 25%～40% of described first piston 8 diameters; Similarly, described second piston rod, 17 bars footpath also is 25%～40% of described second piston, 15 diameters, and like this, can reach increases by 1.06～1.18 times purpose.The described first piston bar 5 and second piston rod 17 also are separately installed with sleeve, and sleeve is provided with limit sensors, can be used for to the electric control system feedback signal.
Described low pressure original water inlet 1 is connected in described first cavity 7 by the first feed liquor valve 4 respectively, connects described the 3rd cavity 16 by the second feed liquor valve 18.
First cavity 7 of described first fluid cylinder 6 is connected in the former water out 2 of high pressure of described high pressure raw water pump 22 by first liquid discharging valve 3, and second cavity 9 of described first fluid cylinder 6 is connected in two position-5 way valves 12.
The 3rd cavity 16 of described second fluid cylinder 14 is connected in the former water out 2 of high pressure of described high pressure raw water pump 22 by second liquid discharging valve 19, and the 4th cavity 13 of described second fluid cylinder 14 is connected in two position-5 way valves 12.
Described two position-5 way valves 12 are connected in high-pressure thick water inlet 10, and are connected with low-press thick water outlet 11.Described two position-5 way valves 12 drive by selector valve drive unit 26, and the moving element of described two position-5 way valves 12 inside can be a straight line motion, also can be to rotatablely move.
Described selector valve drive unit 26 can be wherein any one of fluid pressure drive device, actuating device of atmospheric pressure or electric energy drive unit, but preferred hydraulic driving, hydraulically powered advantage is, can make two position-5 way valves, 12 internal operations steady, and it is less to take up room simultaneously.
High-pressure thick water out 10 places of described reverse osmosis unit 23 can also be provided with buffer 25, and described buffer 25 can further be subdued the pressure surge that moment causes because piston commutates.
The above-mentioned first feed liquor valve 4, the second feed liquor valve 18, first liquid discharging valve 3, second liquid discharging valve 19 are unidirectional tubular type flow-distributing valve, are respectively conical surface seal, improve sealing effect.
The placing direction of described first fluid cylinder 6 and second fluid cylinder 14 and reverse osmosis unit 23 laid parallels can be saved the space.
Below, be that example is done specific descriptions to differential type energy reclaiming method of the present invention with a medium tache in the recovery method:
As shown in Figure 2, selector valve drive unit 26 transfers to position one with two position-5 way valves 12, makes second cavity 9 and high-pressure thick water inlet 10 UNICOMs of first fluid cylinder 6, the 4th cavity 13 and low-press thick water outlet 11 UNICOMs of second fluid cylinder 14.
The former water of low pressure enters low pressure raw water pump 18 and once pressurizes by entering former water inlet 1, the former moisture two-way after the pressurization once, and one the tunnel enters first cavity 7 of first fluid cylinder 6 or the 3rd cavity 16 of second fluid cylinder 14, and another road enters high pressure raw water pump 22.The former water of once pressurization that enters high pressure raw water pump 22 enters reverse osmosis unit 23 after by the secondary pressurization, and what see through reverse osmosis membrane be low pressure fresh water, and the water through reverse osmosis membrane is high-pressure thick water.
High-pressure thick water is by passing through two position-5 way valves 12 through high-pressure thick water inlet 10, enter in second cavity 9 of first fluid cylinder 6, the high-pressure thick water of second cavity, 9 inside promotes first piston 8 and rigidly connected with it first piston bar 5 moves to the direction that first piston bar 5 stretches out together, the pressurization of the former water of the once pressurization of first cavity, 7 inside, and converge by the former water of high pressure that first liquid discharging valve 3 comes out with high pressure raw water pump 22 and to enter reverse osmosis membrane.Described first liquid discharging valve 3 approximately is 3: 2 with the water flow ratio of described high pressure raw water pump 22 water outlets.
Simultaneously, the former water that once pressurizes that comes out from low pressure raw water pump 20 enters the 3rd cavity 16 of second fluid cylinder 14 by the second feed liquor valve, 18 parts, the former water that the 3rd cavity 16 inside have a certain pressure promotes second piston 15 and rigidly connected with it second piston rod 17 together to the motion of second fluid cylinder, 14 bottoms, the dense water release of the 4th cavity 13 inside.
As shown in Figure 3, first piston 8 when first fluid cylinder, 6 inside moves to spacing position, limit sensors on first piston bar 5 sleeves sends feedback signal, electric control system drives two position-5 way valves 12 by selector valve drive unit 26 and commutates to position two, make second cavity 9 and low-press thick water outlet 11 UNICOMs of first fluid cylinder 6, the 4th cavity 13 high-pressure thick water inlets 10 UNICOMs of second fluid cylinder 14.
The high-pressure thick water that comes out from reverse osmosis unit 23 enters the 4th cavity 13 of second fluid cylinder 14 by two position-5 way valves 12, promote the direction motion that second piston 15 and rigidly connected with it second piston rod 17 stretch out to second piston rod 17 together, the pressurization of the former water in the 3rd cavity 16, the former water of high pressure that comes out with high pressure raw water pump 22 by second liquid discharging valve 19 converges and enters reverse osmosis membrane.
The former water that once pressurizes that comes out from low pressure raw water pump 20 enters first cavity 7 of first fluid cylinder 6 by the first feed liquor valve, 4 parts simultaneously, former water promotion first piston 8 and rigidly connected with it first piston bar 5 that first cavity, 7 inside have certain pressure move to first fluid cylinder, 6 bottoms together, and the dense water of second cavity, 9 inside is released.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, these all belong within protection scope of the present invention.
Claims (9)
1. differential energy recovery device that is used for seawater desalination system, comprise the low pressure original water inlet that is connected in low pressure raw water pump water outlet, the former water out of high pressure that is connected in high pressure raw water pump water outlet, the high-pressure thick water inlet that is connected in reverse osmosis unit high-pressure thick water water outlet, it is characterized in that
Comprise that also identical inside is provided with first fluid cylinder and inner second fluid cylinder that is provided with second piston of first piston, described first piston is divided into first cavity and second cavity with described first fluid cylinder, described first piston is connected with the first piston bar, described second piston is divided into the 3rd cavity and the 4th cavity with described second fluid cylinder, and described second piston is connected with second piston rod;
Described low pressure original water inlet connects described first cavity by the first feed liquor valve, and described first cavity connects the former water out of described high pressure by first liquid discharging valve, and described second cavity is connected in two position-5 way valves;
Described low pressure original water inlet connects described the 3rd cavity by the second feed liquor valve, and described the 3rd cavity connects the former water out of described high pressure by second liquid discharging valve, and described the 4th cavity is connected in two position-5 way valves;
Described two position-5 way valves are connected in the high-pressure thick water inlet, and are connected with the low-press thick water outlet.
2. a kind of differential energy recovery device that is used for seawater desalination system according to claim 1 is characterized in that, described two position-5 way valves drive by the selector valve drive unit.
3. a kind of differential energy recovery device that is used for seawater desalination system according to claim 2 is characterized in that, described selector valve drive unit is wherein a kind of of fluid pressure drive device, actuating device of atmospheric pressure or electric energy drive unit.
4. a kind of differential energy recovery device that is used for seawater desalination system according to claim 3 is characterized in that described selector valve drive unit is a fluid pressure drive device.
5. a kind of differential energy recovery device that is used for seawater desalination system according to claim 1 is characterized in that, the high-pressure thick water out place of described reverse osmosis unit is provided with buffer.
6. a kind of differential energy recovery device that is used for seawater desalination system according to claim 1 is characterized in that, described first piston bar and described second piston rod are separately installed with sleeve, and described sleeve is provided with limit sensors.
7. a kind of differential energy recovery device that is used for seawater desalination system according to claim 1, it is characterized in that, described first piston bar bar directly is 25%～40% of a described first piston diameter, and the described second piston rod bar directly is 25%～40% of described second piston diameter.
8. a kind of differential energy recovery device that is used for seawater desalination system according to claim 1 is characterized in that, the described first feed liquor valve, the second feed liquor valve, first liquid discharging valve, second liquid discharging valve are respectively conical surface seal.
9. a differential type energy reclaiming method that is used for seawater desalination system that utilizes claim 1 described device to realize is characterized in that, is made up of following steps successively:
A. the selector valve drive unit transfers to position one with two position-5 way valves, makes second cavity and the high-pressure thick water inlet UNICOM of first fluid cylinder, the 4th cavity of second fluid cylinder and low-press thick water outlet UNICOM;
B. make the former water of low pressure feed the low pressure raw water pump, once pressurize;
C. the former water of low pressure after once pressurizeing enters first cavity of high pressure raw water pump, first fluid cylinder and the 3rd cavity of second fluid cylinder respectively by the former water out of low pressure;
D. the former water of low pressure that enters the high pressure raw water pump enters reverse osmosis unit after by the secondary pressurization, discharges low pressure fresh water and high-pressure thick water;
E. high-pressure thick water enters second cavity of first fluid cylinder by two position-5 way valves, promote the motion of first piston and first piston bar, the pressurization of the former water of once pressurization in first cavity is discharged, and converge with the former water of the high pressure of the former water out of high pressure and to enter reverse osmosis unit;
F. work as first piston and move to spacing position, feedback by limit sensors, the selector valve drive unit transfers to position two with two position-5 way valves, makes second cavity and the low-press thick water outlet UNICOM of first fluid cylinder, the 4th cavity of second fluid cylinder and high-pressure thick water inlet UNICOM;
G. high-pressure thick water enters the 4th cavity of second fluid cylinder by two position-5 way valves, promote second piston and second piston rod movement, the former water pressurization of once pressurization in the 3rd cavity is discharged, and converge with the former water of the high pressure of the former water out of high pressure and to enter reverse osmosis unit, the former water of once pressurization in first cavity promotes first piston and the motion of first piston bar simultaneously, and the low-press thick water in second cavity is discharged;
H. arrive spacing position when second piston motion, by the feedback of limit sensors, the selector valve drive unit transfers to position one with two position-5 way valves;
I. high-pressure thick water enters second cavity of first fluid cylinder by two position-5 way valves, promote the motion of first piston and first piston bar, the former water pressurization of once pressurization in first cavity is discharged, and converge with the former water of the high pressure of the former water out of high pressure and to enter reverse osmosis unit, the former water of once pressurization in the 3rd cavity promotes second piston and second piston rod movement simultaneously, and the low-press thick water in the 4th cavity is discharged;
J. after this circulation is carried out step (f) to step (i).
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| CN110316884A (en) * | 2019-07-02 | 2019-10-11 | 江苏科技大学 | SWRO with energy regenerating and MCDI coupling seawater desalination plant system |
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| CN111204892A (en) * | 2020-02-26 | 2020-05-29 | 苏州新派特信息科技有限公司 | Seawater desalination and permeation device |
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