CN103191642B - Pressure exchange cylinder and valve-control pressure exchanger for reverse osmosis desalting system - Google Patents
Pressure exchange cylinder and valve-control pressure exchanger for reverse osmosis desalting system Download PDFInfo
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- CN103191642B CN103191642B CN201310099572.5A CN201310099572A CN103191642B CN 103191642 B CN103191642 B CN 103191642B CN 201310099572 A CN201310099572 A CN 201310099572A CN 103191642 B CN103191642 B CN 103191642B
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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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Abstract
The invention discloses a pressure exchange cylinder and a valve-control pressure exchanger for a reverse osmosis desalting system. At least two hydraulic pressure exchange channels are arranged in a cylinder body; each hydraulic pressure exchange channel can communicate a raw water port with a thick water port; the valve-control pressure exchanger is formed by connecting at least two pressure exchange cylinders in parallel; the raw water port of each pressure exchange cylinder is connected with a low-pressure raw water inlet one-way valve and a high-pressure raw water outlet one-way valve which are connected in parallel; the thick water ports of the pressure exchange cylinders are all commonly connected to a reversing valve; and the pressure exchange cylinders are provided with sensors at the raw water ports. By adopting the valve-control pressure exchanger, the pressure of the high-pressure thick water can be directly transmitted to the low-pressure raw water, and the energy recovering efficiency reaches 90% or more; meanwhile, the synchronous control is achieved by the one-way valves and the reversing valve, and the alternative boosting of the pressure exchange cylinders is achieved; the mixing degree of thick water and raw water in contact with each other can be greatly reduced, the volume use ratio is improved, and the mixing volume is about 20-30% of the volume of the hydraulic pressure channels.
Description
Technical field
The present invention relates to a kind of energy recycle device, specifically, relate to a kind of for the pressure exchanger in seawater and bitter impervious desalination system, belong to Work-exchange type energy regenerating type.
Background technology
The strong brine that impervious desalination system is discharged has very high pressure, if do not carry out the energy dissipation that utilization can cause about 60%, the technology that counter-infiltration system strong brine overbottom pressure can be recycled is Energy Recovery Technology.Current energy recycle device mainly contains two types, hydraulic turbine formula and Work-exchange type.Wherein, Work-exchange type Energy Recovery Technology is by interface or spacer, directly the pressure of high-pressure thick water is passed to charging seawater, and only need through " pressure energy-pressure energy " step power conversion, energy recovery efficiency can up to 90-97%.
At present, the Work-exchange type energy recovery device applied in impervious desalination system is mainly valve-regulated pressure exchanger and rotator type pressure exchanger two class.Valve-regulated pressure exchanger, in parallel by two or more hydraulic cylinder, be isolated into dense water and fresh water two chambers by " entity piston " in hydraulic cylinder, control hydraulic cylinder in parallel by reversal valve, hocket supercharging; Entity piston volume is relatively large, and in the moment that reversal valve switches, often there will be pressure and flowed fluctuation.Rotator type pressure exchanger with the PX energy recycle device of ERI company of the U.S. for representative, high-pressure thick water promotes shaftless ceramic rotor and rotates, by " fluid piston " directly supercharging charging seawater, realize continous-stable supercharging, and device volume is less, but there is the mixed problem of raw material seawater and strong brine.Above-mentioned two kinds of pressure exchangers respectively have its advantage and defect.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of multichannel pressure-exchange cylinder, simultaneously in conjunction with the supercharging mode of rotator type pressure exchanger and the reversing mode of valve-regulated pressure exchanger, one is provided to be applicable to impervious desalination system, the former seawater pressure of low pressure can be promoted, realize the valve governor pressure interchanger of energy regenerating.
In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:
For a pressure-exchange cylinder for impervious desalination system, comprise cylinder body, described cylinder interior is provided with at least two hydraulic pressure interchange channels, and the described former mouth of a river can be connected with described concentrated water spout by each described hydraulic pressure interchange channel.
Described hydraulic pressure interchange channel can be separated by the channel plate being fixed on described inboard wall of cylinder block.
Described hydraulic pressure interchange channel also can be made up of the tube channel be arranged between two gripper shoes, and two described gripper shoes lay respectively at described cylinder body two ends and are fixed on described inboard wall of cylinder block.
Preferably, the length of described hydraulic pressure interchange channel is 0.1m ~ 20m.
Preferably, the sectional area ratio of single described hydraulic pressure interchange channel and described cylinder body is 0.001 ~ 0.5.
The arrangement mode of multiple described hydraulic pressure interchange channel is the arbitrary arrangement modes such as annular array, rectangular array or honey-comb shape array.
A kind of valve governor pressure interchanger for impervious desalination system, comprise above-mentioned pressure-exchange cylinder, described pressure-exchange cylinder adopts at least two parallel connections, the described former mouth of a river of each described pressure-exchange cylinder is connected with low pressure former water water feeding one-way valve in parallel and the former water of high pressure goes out water one-way valve, the described concentrated water spout of all described pressure-exchange cylinders is connected with reversal valve jointly, and described pressure-exchange cylinder position, the former mouth of a river described in it is provided with sensor.
When described pressure-exchange cylinder adopt two in parallel time, described reversal valve adopts two position switching valves, described two position switching valve inside are provided with two pistons be connected with piston rod, and are provided with a high-pressure thick water inlet, two low-press thick water outlets and two connectors be connected with the described concentrated water spout of described pressure-exchange cylinder.
Described sensor is pressure transmitter, online conductivity meter or online salinity transmitter etc.
The invention has the beneficial effects as follows:
(1) pressure-exchange cylinder of the present invention, does not need in cylinder body to arrange entity piston, and directly by " fluid piston ", the pressure energy of high-pressure thick water is directly passed to the former water of low pressure, energy recovery efficiency is up to more than 90%;
(2) valve governor pressure interchanger of the present invention utilizes check valve and reversal valve Synchronization Control, and realize the alternately supercharging of pressure-exchange cylinder, multiple pressure-exchange cylinder operationally exists certain phase difference, can reduce pressure and the flowed fluctuation of water inlet and water outlet;
(3) pressure-exchange cylinder interior of the present invention is provided with multiple longer, thinner hydraulic pressure interchange channel, significantly can reduce the degree of mixing of dense water and the former water contacted with each other, and improve capacity utilization, and mixing volume is about the 20%-30% of hydraulic channel volume;
(4) the present invention arranges online conductivity meter in side, the pressure-exchange cylinder former mouth of a river, monitors, feeds back and regulate and control motion state and the position of piston at any time, to carry out optimization debugging to whole device.
Accompanying drawing explanation
Fig. 1 is the overall structure longitudinal sectional drawing of valve governor pressure interchanger provided by the present invention;
Fig. 2 is the longitudinal sectional drawing of pressure-exchange cylinder provided by the present invention;
Fig. 3 is the transverse cross-sectional view of pressure-exchange cylinder provided by the present invention;
Wherein, Fig. 3 (a) represents the annular array hydraulic pressure interchange channel adopting tube channel mode; Fig. 3 (b) represents the annular array hydraulic pressure interchange channel adopting channel plate mode; Fig. 3 (c) represents the honey-comb shape array hydraulic pressure interchange channel adopting channel plate mode;
Fig. 4 is the first using state figure of valve governor pressure interchanger provided by the present invention;
Fig. 5 is the second using state figure of valve governor pressure interchanger provided by the present invention.
In figure: the former water water feeding one-way valve of 1: the second low pressure; The former water of 2: the second high pressure goes out water one-way valve;
The former water water feeding one-way valve of 3: the first low pressure; The former water of 4: the first high pressure goes out water one-way valve;
5: the first pressure-exchange cylinders;
5-1: the first former mouth of a river; 5-2: the first online conductivity meter; 5-3: the first gripper shoe; 5-4: first passage pipe;
5-5: the second gripper shoe; 5-6: the first concentrated water spout; 5-7: channel plate;
6: two position switching valves;
6-1: electricity-driven device; 6-2: the first low-press thick water out; 6-3: first piston; 6-4: piston rod;
6-5: high-pressure thick water inlet; 6-6: the second piston; 6-7: the second low-press thick water out;
7: the second pressure-exchange cylinders;
7-1: the second former mouth of a river; 7-2: the second online conductivity meter; 7-3: the three gripper shoe; 7-4: second channel pipe;
7-5: the four gripper shoe; 7-6: the second concentrated water spout;
8: the former water of low pressure; 9: supply-water pump; 10: high-pressure pump; 11: booster pump; 12: reverse osmosis membrane assembly; 13: product water tank.
Detailed description of the invention
Below by specific embodiment, the present invention is described in further detail, and following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
The present embodiment is described for the valve governor pressure interchanger arranging two pressure-exchange cylinders, and two pressure-exchange cylinders are referred to as the first pressure-exchange cylinder 5 and the second pressure-exchange cylinder 7, and correspondingly reversal valve adopts two position switching valves 6.
As shown in Figure 1, the multiple valve governor pressure interchanger of the present embodiment comprises identical and the first pressure-exchange cylinder 5 and the second pressure-exchange cylinder 7 of parallel connection.
First pressure-exchange cylinder 5 two ends are respectively arranged with the first former mouth of a river 5-1 and the first concentrated water spout 5-6, be distributed with multiple cross section is the first circular hydraulic pressure interchange channel inner homogeneous, and the first former mouth of a river 5-1 can be connected with the first concentrated water spout 5-6 by each first hydraulic pressure interchange channel.First hydraulic pressure interchange channel formed by first passage pipe 5-4, the two ends of first passage pipe 5-4 are connected on the first gripper shoe 5-3 and the second gripper shoe 5-5, first gripper shoe 5-3 and the second gripper shoe 5-5 is connected on the inboard wall of cylinder block at the first pressure-exchange cylinder 5 two ends, composition graphs 3(a) shown in.The connected mode of first passage pipe 5-4 and the first gripper shoe 5-3, the second gripper shoe 5-5, the first gripper shoe 5-3, the second gripper shoe 5-5 can adopt with the connected mode of inboard wall of cylinder block weld, expanded joint, welded and rolled tube joint and with etc.
First hydraulic pressure interchange channel is preferably designed as longer and comparatively carefully, length is at least 0.1m, is good with 0.1m ~ 20m; The sectional area ratio of the first hydraulic pressure interchange channel and the first pressure-exchange cylinder 5 cylinder body preferably designs in the scope of 0.001 ~ 0.5.The design length of the first hydraulic pressure interchange channel is longer, and capacity utilization is higher; And the first hydraulic pressure interchange channel is less with the ratio of the sectional area of the first pressure-exchange cylinder 5 cylinder body, length of mixing is shorter.Therefore the first hydraulic pressure interchange channel is preferably designed as longer and comparatively carefully, obviously can increases the capacity utilization of passage, reduce the degree of mixing of dense water and former water simultaneously.Such as, the internal diameter of the first pressure-exchange cylinder 5 can be taken as 250mm, inner homogeneous distributes 12 circular the first hydraulic pressure interchange channels, and adopt annular array, the length of each first hydraulic pressure interchange channel is taken as 2.0m, and internal diameter is taken as 50mm.
The cross sectional shape of the first hydraulic pressure interchange channel than a circular one, can also be square polygon such as grade and other shapes; Multiple first hydraulic pressure interchange channel can adopt the various arrangement modes such as annular array, rectangular array or honey-comb shape array, as shown in Figure 3.As long as any channel shape that the first pressure-exchange cylinder 5 can be separated and arrangement mode all can form technical scheme of the present invention, complete beneficial effect of the present invention.
As shown in Fig. 2 and Fig. 3 (b), Fig. 3 (c), first hydraulic pressure interchange channel can also adopt the channel plate 5-7 being fixed on the first pressure-exchange cylinder 5 inwall to be directly separated, the two ends of channel plate 5-7 and the first pressure-exchange cylinder 5 cylinder body have spacing, thus the first former mouth of a river 5-1 is connected with the first concentrated water spout 5-6 by each first hydraulic pressure interchange channel.
Similarly, second pressure-exchange cylinder 7 two ends are respectively arranged with the second former mouth of a river 7-1 and the second concentrated water spout 7-6, be distributed with multiple cross section is the second circular hydraulic pressure interchange channel inner homogeneous, and the second former mouth of a river 7-1 can be connected with the second concentrated water spout 7-6 by each second hydraulic pressure interchange channel.Second hydraulic pressure interchange channel formed by second channel pipe 7-4, the two ends of second channel pipe 7-4 are connected on the 3rd gripper shoe 7-3 and the 4th gripper shoe 7-5, and the 3rd gripper shoe 7-3 and the 4th gripper shoe 7-5 is connected on the inboard wall of cylinder block at the second pressure-exchange cylinder 7 two ends.The connected mode of the inner each parts of the second pressure-exchange cylinder 7 is identical with the first pressure-exchange cylinder 5 with designing requirement, repeats no more herein.
Again as shown in Figure 1, first pressure-exchange cylinder 5 is connected with the first low pressure former water water feeding one-way valve 3 on the first former mouth of a river 5-1 and the former water of the first high pressure goes out water one-way valve 4, it is in parallel that first low pressure former water water feeding one-way valve 3 and the former water of the first high pressure go out water one-way valve 4, all adopts sealing to arrange.First low pressure former water water feeding one-way valve 3 controls the former water of low pressure 8 and can only enter the former water of the first pressure-exchange cylinder 5, first high pressure by the first former mouth of a river 5-1 and go out water one-way valve 4 and control the former water of high pressure and can only discharge from the first pressure-exchange cylinder 5 through the first former mouth of a river 5-1.
Second pressure-exchange cylinder 7 is connected with the second low pressure former water water feeding one-way valve 1 on the second former mouth of a river 7-1 and the former water of the second high pressure goes out water one-way valve 2, and it is in parallel that the second low pressure former water water feeding one-way valve 1 and the former water of the second high pressure go out water one-way valve 2, all adopts sealing to arrange.Second low pressure former water water feeding one-way valve 1 controls the former water of low pressure 8 and can only enter the former water of the second pressure-exchange cylinder 7, second high pressure by the second former mouth of a river 7-1 and go out water one-way valve 2 and control the former water of high pressure and can only discharge from the second pressure-exchange cylinder 7 through the second former mouth of a river 7-1.
The first online conductivity meter 5-2 is provided with between first former mouth of a river 5-1 and the first gripper shoe 5-3 of the first pressure-exchange cylinder 5; The second online conductivity meter 7-2 is provided with between second former mouth of a river 7-1 of the second pressure-exchange cylinder 7 and the 3rd gripper shoe 7-3.First online conductivity meter 5-2, as sensor, is arranged on the optional position near the first former mouth of a river 5-1; Second online conductivity meter 7-2, as sensor, is arranged on the optional position near the second former mouth of a river 7-1.Sensor herein can be pressure transmitter, online conductivity meter or online salinity transmitter etc., to reach the object of monitoring at any time.
First pressure-exchange cylinder 5 is connected with two position switching valves 6 by the second concentrated water spout 7-6 by the first concentrated water spout 5-6, the second pressure-exchange cylinder 7.Two position switching valves 6 drive commutation by electricity-driven device 6-1, and inside is provided with the first piston 6-3 that is connected with piston rod 6-4 and the second piston 6-6, first piston 6-3, junction between the second piston 6-6 and valve pocket is equipped with hermetically-sealed construction.The centre position of two position switching valve 6 outsides is provided with a high-pressure thick water inlet 6-5, and upper-lower position is respectively arranged with the first low-press thick water out 6-2 and the second low-press thick water out 6-7.
When valve governor pressure interchanger arranges multiple pressure-exchange cylinder, correspondingly reversal valve adopts multi-position reversing valve.Multi-position reversing valve inside is provided with multidigit piston, and is provided with a high-pressure thick water inlet, the multiple low-press thick water outlet identical with pressure-exchange cylinder quantity and multiple connector be connected with the concentrated water spout of pressure-exchange cylinder.By controlling multi-position reversing valve, each pressure-exchange cylinder can be made to be in out of phase, to cooperatively interact, realize circularly-supercharged.
Below in conjunction with Fig. 4 and Fig. 5, the typical RO desalination system technological process being provided with valve governor pressure interchanger of the present invention is described:
Two-way is divided into after the former water 8 of low pressure is pressurizeed by supply-water pump 9, one route high-pressure pump 10 enters reverse osmosis membrane assembly 12, and another route first low pressure former water water feeding one-way valve 3 or the former water water feeding one-way valve 1 of the second low pressure enter the first pressure-exchange cylinder 5 or the second pressure-exchange cylinder 7.Former water is after reverse osmosis membrane assembly 12 desalination, and output fresh water enters product water tank 13, and the dense water of residual high pressure then enters pressure exchanger by high-pressure thick water inlet 6-5 and carries out energy regenerating.
When two position switching valves 6 are adjusted to position one by electricity-driven device 6-1, as shown in Figure 4, first concentrated water spout 5-6 of the first pressure-exchange cylinder 5 is connected with high-pressure thick water inlet 6-5, and the second concentrated water spout 7-6 of the second pressure-exchange cylinder 7 is connected with the second low-press thick water outlet 6-7.High-pressure thick water enters into the first pressure-exchange cylinder 5 by the first concentrated water spout 5-6, promotes the former water of low pressure to left movement, realize the direct exchange of energy in the first hydraulic pressure interchange channel.After former water supercharging, go out water one-way valve 4 by the first former mouth of a river 5-1 and the former water of the first high pressure and discharge, rise to operating pressure further through booster pump 11, converge with the water outlet of high-pressure pump 10, then enter reverse osmosis membrane assembly 12 together.Meanwhile, the former water of low pressure enters the second pressure-exchange cylinder 7 by the former water water feeding one-way valve 1 of the second low pressure and moves right in the second hydraulic pressure interchange channel, promotes low-press thick seawater and discharges system through the second concentrated water spout 7-6 and concentrated water discharge mouth 6-7.
When the conductivity value that the online conductivity meter 5-2 of first in the first pressure-exchange cylinder 5 detects reaches setting value, signal is provided to electricity-driven device 6-1 by control system, electricity-driven device 6-1 makes two position switching valves 6 be adjusted to position two, as shown in Figure 5, second concentrated water spout 7-6 of the second pressure-exchange cylinder 7 is connected with high-pressure thick water inlet 6-5, and the first concentrated water spout 5-6 of the first pressure-exchange cylinder 5 is connected with the first low-press thick water outlet 6-2.Now, high-pressure thick water is by high-pressure thick water inlet 6-5, the second pressure-exchange cylinder 7 is entered into through the second concentrated water spout 7-6, the former water of low pressure is promoted to left movement in the second hydraulic pressure interchange channel, from the second former mouth of a river 7-1 after former water supercharging, go out water one-way valve 2 and booster pump 11 through the former water of the second high pressure, enter reverse osmosis membrane assembly 12.Meanwhile, the former water of low pressure enters the first pressure-exchange cylinder 5 by the former water water feeding one-way valve 3 of the first low pressure, moves right in the first hydraulic pressure interchange channel, promotes low-press thick seawater and discharges system through the first concentrated water spout 5-6 and the first low-press thick water outlet 6-2.
When the conductivity value that the online conductivity meter 7-2 of second in the second pressure-exchange cylinder 7 detects reaches setting value, provide signal by control system to electricity-driven device 6-1, make two position switching valves 6 be adjusted to position one, carry out new round supercharging.Said process hockets, and can realize the recycling of high-pressure thick water overbottom pressure energy.
The conductivity setpoint of the first online conductivity meter 5-2, the second online conductivity meter 7-2 sets according to conductivity variations situation during actual motion.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make the concrete conversion of a lot of form, these all belong within protection scope of the present invention.
Claims (7)
1. the pressure-exchange cylinder for impervious desalination system, comprise the cylinder body being provided with the former mouth of a river and concentrated water spout, it is characterized in that, described cylinder interior is provided with at least two hydraulic pressure interchange channels, and the described former mouth of a river can be connected with described concentrated water spout by each described hydraulic pressure interchange channel;
Described hydraulic pressure interchange channel is separated by the channel plate being fixed on described inboard wall of cylinder block;
Or described hydraulic pressure interchange channel is made up of the tube channel be arranged between two gripper shoes, two described gripper shoes lay respectively at described cylinder body two ends and are fixed on described inboard wall of cylinder block.
2. a kind of pressure-exchange cylinder for impervious desalination system according to claim 1, is characterized in that, the length of described hydraulic pressure interchange channel is 0.1m ~ 20m.
3. a kind of pressure-exchange cylinder for impervious desalination system according to claim 1, is characterized in that, the sectional area ratio of single described hydraulic pressure interchange channel and described cylinder body is 0.001 ~ 0.5.
4. a kind of pressure-exchange cylinder for impervious desalination system according to claim 1, is characterized in that, the arrangement mode of multiple described hydraulic pressure interchange channel is annular array, rectangular array or honey-comb shape array.
5. the valve governor pressure interchanger for impervious desalination system, it is characterized in that, comprise the pressure-exchange cylinder as described in any one of claim 1-4, described pressure-exchange cylinder adopts at least two parallel connections, the described former mouth of a river of each described pressure-exchange cylinder is connected with low pressure former water water feeding one-way valve in parallel and the former water of high pressure goes out water one-way valve, the described concentrated water spout of all described pressure-exchange cylinders is connected with reversal valve jointly, and described pressure-exchange cylinder position, the former mouth of a river described in it is provided with sensor.
6. a kind of valve governor pressure interchanger for impervious desalination system according to claim 5, it is characterized in that, described pressure-exchange cylinder adopts two parallel connections, described reversal valve adopts two position switching valves, described two position switching valve inside are provided with two pistons be connected with piston rod, and are provided with a high-pressure thick water inlet, two low-press thick water outlets and two connectors be connected with the described concentrated water spout of described pressure-exchange cylinder.
7. a kind of valve governor pressure interchanger for impervious desalination system according to claim 5, is characterized in that, described sensor is pressure transmitter, online conductivity meter or online salinity transmitter.
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| CN201310099572.5A CN103191642B (en) | 2013-03-26 | 2013-03-26 | Pressure exchange cylinder and valve-control pressure exchanger for reverse osmosis desalting system |
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| CN201310099572.5A CN103191642B (en) | 2013-03-26 | 2013-03-26 | Pressure exchange cylinder and valve-control pressure exchanger for reverse osmosis desalting system |
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| CN103191642B true CN103191642B (en) | 2015-03-04 |
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Cited By (1)
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| CN110594118A (en) * | 2019-09-06 | 2019-12-20 | 北京朗新明环保科技有限公司 | High salt water energy conversion control system |
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| CN104096480B (en) * | 2014-08-08 | 2016-04-27 | 乾通环境科技(苏州)有限公司 | The high power enrichment facility of high efficiency low energy consumption and the method for feed liquid process thereof |
| CN104229939B (en) * | 2014-09-19 | 2015-10-28 | 北京工业大学 | A kind of fluid pressure energy retracting device based on piston type liquid switch |
| CN104310621B (en) * | 2014-10-12 | 2016-08-24 | 张志雄 | A kind of clip clutch shaft carborundum aluminium alloy island drinking-water instrument for extracting |
| CN108915972A (en) * | 2018-07-25 | 2018-11-30 | 中煤科工集团重庆研究院有限公司 | Two cavity pressure potential energy of plunger type exchanges recovery system and method |
| CN109340023A (en) * | 2018-11-26 | 2019-02-15 | 西安交通大学 | A kind of interior rotary-type pressure energy recyclable device with partition plate structure of runner |
| CN115400593A (en) * | 2022-09-22 | 2022-11-29 | 自然资源部天津海水淡化与综合利用研究所 | Combined energy recovery device for seawater desalination and working method |
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| CN101125693A (en) * | 2007-07-10 | 2008-02-20 | 浙江大学 | Hydraulic pressure type double-piston single-cylinder pressure exchange energy reclaiming device |
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| CN1721047A (en) * | 2005-06-17 | 2006-01-18 | 国家海洋局杭州水处理技术研究开发中心 | Energy-saving reverse osmosis treatment system |
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