CN107398177B - External rotor type pressure exchanger - Google Patents
External rotor type pressure exchanger Download PDFInfo
- Publication number
- CN107398177B CN107398177B CN201610367912.1A CN201610367912A CN107398177B CN 107398177 B CN107398177 B CN 107398177B CN 201610367912 A CN201610367912 A CN 201610367912A CN 107398177 B CN107398177 B CN 107398177B
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- China
- Prior art keywords
- outer rotor
- stator
- fluid
- central stator
- central
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000012530 fluid Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 238000007514 turning Methods 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 claims description 2
- 239000013535 sea water Substances 0.000 description 7
- 239000012267 brine Substances 0.000 description 5
- 238000010612 desalination reaction Methods 0.000 description 5
- 238000001223 reverse osmosis Methods 0.000 description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- -1 e.g. Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/06—Energy recovery
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
An outer rotor pressure exchanger for transferring pressure energy from a high pressure first fluid to a low pressure second fluid to provide a pressurized second fluid, the pressure exchanger comprising: a center stator and an outer rotor rotating around the outside of the center stator; the outer rotor has at least two passages extending generally axially through the outer rotor, the passages having a first opening at one end of the inner side of the outer rotor and a second opening at the other end of the inner side of the outer rotor, the openings being spaced apart from each other along the length of the inner side of the outer rotor; the central stator has two or more inlet passages and two or more discharge passages, the passage openings being arranged to: when the outer rotor first channel end opening is aligned with the inlet passage opening on one of the central stators, the channel other end opening is also aligned with the discharge passage opening on the stator.
Description
Technical Field
The present application relates to a rotary pressure transfer device in which a first high-pressure fluid in an outer rotor is hydraulically communicated with a second low-pressure fluid and pressure is transferred between the fluids to produce a high-pressure discharge flow of the second fluid. More particularly, the present application relates to a rotary pressure transmitting device employing a mode in which a central stator is stationary and an outer rotor rotates.
Background
Reverse osmosis membrane method sea water desalination is widely adopted in various countries, and has been greatly developed in recent years in China, and will become the main stream technology of sea water desalination industry in China in the future.
The energy recovery device is one of key equipment of the reverse osmosis sea water desalination system, and is important to greatly reduce the energy consumption and the water production cost of the system. The energy recovery devices can be divided into two types according to the working principle, a hydraulic turbine type and a positive displacement type. The former is represented by HTC (Hydraulic TurboCharger) of PEI company in America, and generally requires a two-step conversion process of 'pressure energy one shaft work one pressure energy', and the energy recovery efficiency is only 50% to 75%. The latter is represented by PX (PressureExchanger) of ERI company in the United states, and the energy recovery efficiency is as high as 90% -95% only by a one-step conversion process of pressure energy and pressure energy, so that the method becomes the key point of research and popularization at home and abroad.
The use of pressure exchangers in reverse osmosis processes for the water desalination industry, in particular for the seawater reverse osmosis desalination industry, is well known. For example, U.S. Pat. No. 7,251,557 discloses a rotary positive displacement pressure exchanger. However, the applicant of the present application has proven that the existing rotary positive displacement pressure exchangers are expensive, the single machine throughput is small and the processing difficulty is high.
Embodiments of the present application seek to provide an outer rotor pressure exchanger that overcomes or at least alleviates one or more of the disadvantages of the pressure exchangers previously mentioned.
Disclosure of Invention
A pressure exchanger for transferring pressure energy from a high pressure first fluid to a low pressure second fluid to provide a pressurized second fluid, the pressure exchanger comprising: a center stator and an outer rotor rotating around the outside of the center stator; the outer rotor is similar to a circular cylinder, the outer rotor is provided with at least one channel extending through the outer rotor along the axial direction, the channel is provided with a first opening at one end of the inner side surface of the outer rotor, the other end of the inner side surface of the outer rotor is provided with a second opening, and the openings are separated from each other along the length direction of the inner side surface of the outer rotor; the central stator being a cylinder, the central stator having two or more inlet passages and two or more discharge passages, the inlet passages having inlet passage openings at an outer side of the central stator, the discharge passages having discharge passage openings at an outer side of the central stator, the passage openings being arranged to: when an outer rotor first channel end opening is aligned with an inlet passage opening on one of the center stators, the channel other end opening is also aligned with a discharge passage opening on the center stator, the inlet passage opening and each of the discharge passage openings of the center stator being continuously sealed from each other during operation by a sealing area at an inner side of the outer rotor and an outer side of the center stator;
whereby during each revolution of said outer rotor said passage openings are alternately aligned at least once with the inlet passage openings on one of said central stators and the opposite outlet passage opening on said central stator and then with the outlet passage openings on one of the central stators and the opposite inlet passage opening on said central stator, whereby each of said passages is supplied with said high pressure first fluid at least once and discharges pressurized second fluid at least once, the central stator and outer rotor being disposed within the housing, the first and second end caps being bolted and sealed to the housing with dowel pins and seals, the first and second end caps being secured and sealed to the central stator with dowel pins and seals passing through the first and second end caps, the central stator having a pair of outlet and inlet ducts at each end, each outlet and inlet duct being open to a corresponding outlet passage inlet.
A method for transferring pressure energy from a high pressure first fluid to a low pressure second fluid to provide a pressurized second fluid, the method comprising the steps of:
rotatably mounting an outer rotor of a circular cylinder outside a central stator of the cylinder and having at least two passages passing generally axially along the rotor between openings in an inner side of the outer rotor; providing a central stator within said housing, said central stator outer side having a smooth surface area such that said central stator outer side interfaces with and slidingly and sealingly mates with said outer side inner side, said central stator having a plurality of inlet passages and a plurality of discharge passages opening at said outer side area, supplying high pressure first fluid to said inlet passages on one central stator while discharging pressurized second fluid from aligned discharge passages on said central stator on the opposite end, and turning said outer rotor about its axis such that said rotor opens said inlet passage openings on said central stator and said discharge passage openings on said central stator partially or fully aligned at least once per revolution, whereby each revolution of the rotor discharges an increased volume of pressurized second fluid as a result of each passage filling and discharging at least once.
The central stator is fixed, the outer rotor rotates around the central stator, a side water inlet mode is adopted instead of a two-end surface water inlet mode, and as long as the matching precision of the outer side surface of the central stator and the inner side surface of the outer rotor is ensured, no special requirement is made on the perpendicularity of the two end surfaces, and therefore the machining requirement is reduced. The passage openings in the central stator are positioned radially, thereby directing fluid radially in as it enters the passage openings and radially out as it exits the passage openings.
Further, the inlet passage on the one central stator through which the high pressure first fluid flows is curved inwardly of the opening, the curvature forming a directional fluid flow into the outer rotor channels, and the aligned outlet passage also has a curvature to cause a change in the direction of fluid flow into and out of the channels, thus turning the outer rotor.
Further, the outer rotor has a plurality of channels radially distributed about the axis of rotation, the channels being equally radially and equiangularly spaced about the axis of rotation.
Further, the center stator has two spaced apart outer cylindrical bearing surfaces with a perimeter groove therebetween that is a sump holding fluid for lubricating the bearing surfaces.
Furthermore, the outer rotor and the central stator are arranged in the shell, and the outer rotor and the central stator are made of pure ceramic wear-resistant materials, or metal or nylon is coated or inlaid with the ceramic wear-resistant materials on the friction surface.
On the one hand, the outer rotor form can increase the drive torque relative to the inner rotor form. On the other hand, the rotation diameter directly influences the machining difficulty, and under the condition of the same rotation diameter, the outer rotor can be larger due to the fact that the outer rotor is unconstrained, and therefore single-machine processing capacity is increased.
Drawings
FIG. 1 is a cross-sectional view of a pressure exchanger according to one embodiment of the present application;
FIG. 2 is an exploded view of the pressure exchanger;
FIG. 3 is a perspective view of the outer rotor of the pressure exchanger core;
FIG. 4 is a perspective view of the pressure exchanger core central stator;
FIG. 5 is a horizontal cross-sectional view of the pressure exchanger at the outer rotor opening, showing a schematic view of the fluid driving outer rotor rotation;
Detailed Description
Fig. 1-5 show a pressure exchanger for transferring pressure from a high pressure fluid to a low pressure fluid. The pressure exchanger 1 comprises a central stator 4 and an outer rotor 3 revolving around the outside of the central stator 4, the central stator 4 and the outer rotor 3 are arranged in a shell 2, a first end cover 5 and a second end cover 6 are fixed and sealed with the shell 2 by bolts 12, 13 and sealing rings 16,17, and the first end cover 5 and the second end cover 6 are fixed and sealed with the central stator 4 by positioning pin holes 19 and sealing rings 14, 15. The central stator 4 passes through the first end cover 5 and the second end cover 6, and is provided with a pair of outlet and inlet pipelines at two ends, wherein each outlet and inlet pipeline corresponds to a corresponding discharge passage inlet passage, for example, a first outlet pipeline 8 and a first inlet pipeline 7 correspond to a first discharge passage 21 and a second inlet passage 20, a second outlet pipeline 9 and a second inlet pipeline 10 correspond to a first discharge passage 22 and a second inlet passage 23, and the pressure exchanger 1 is used for transmitting pressure from high-pressure fluid to low-pressure fluid through rotation of the outer rotor 3 outside the central stator 4.
For example, in operation, high pressure brine from reverse osmosis operation is supplied to the first inlet conduit 7 at the upper end of the device at a pressure of, for example, about 550psig, low pressure seawater is supplied at a pressure of about 30psig, and the outer rotor is turned by pumping a flow of liquid supplied to the second inlet conduit 10 at the lower end of the device, the second inlet passage 20 on the central stator 4 and the second inlet passage 23, as is well known in the art, with a majority of the driving force provided by the high pressure brine. High pressure brine enters the second inlet passage 20 from the first inlet conduit 7 and enters the upper end of each channel 18 on the outer rotor as the rotor rotates, supplying high pressure liquid to the channel 18 in communication therewith, which simultaneously causes the same amount of liquid, e.g., seawater, to enter the second inlet passage 23 from the second inlet conduit 10 at a pressure of about 30 psig. The now pressurized discharge flow of the second liquid, i.e. sea water, enters the first discharge passage 22 and is discharged by the second outlet conduit 9. The discharge flow of the high-pressure brine (waste brine) after the simultaneous completion of the pressure transmission enters the first discharge passage 21 and is discharged from the first outlet pipe 8. And the process described above is automatically repeated indefinitely. The above process occurs continuously for the majority of channels 18 in outer rotor 3. Each channel 18 may be provided with a diaphragm or sliding seal to avoid contact between the two fluids.
It will be appreciated by those skilled in the art that various methods for securing and sealing the components of the housing 12 relative to other components of the housing 12 may be employed and are within the scope of the present application.
Referring to fig. 1 and 3, the plurality of channels 18 in the outer rotor 3 are equally radially and equiangularly spaced around the rotation axis, each channel 18 being curved toward the inside of the second inlet passage 20 and the first discharge passage 22 so that the direction of fluid entering and leaving the channels 18 is changed, due to the outer rotor, and thereby a large torque is obtained for driving the rotation of the outer rotor 3.
The driving force of the outer rotor 3 may be supplemented or replaced by mechanical and/or electrical means.
The outer rotor 3 and the central stator 4 can be made of pure ceramic wear-resistant materials, or can be made of materials such as metal or nylon by coating or embedding the ceramic wear-resistant materials on the friction surface.
The channels 18 may be subdivided into 2 or more small channels which may be advantageous for improved mixing.
Furthermore, it will be appreciated by those skilled in the art that ports that are integer multiples of the number of ports described in the preferred embodiment are within the scope of the present application, in order to address the imbalance force problem, and that the number of fluid pressure exchanges may be increased in one revolution.
Claims (9)
1. A pressure exchanger for transferring pressure energy from a high pressure first fluid to a low pressure second fluid to provide a pressurized second fluid, the pressure exchanger comprising: a center stator and an outer rotor rotating around the outside of the center stator; the outer rotor is similar to a circular cylinder, the outer rotor is provided with at least one channel extending through the outer rotor along the axial direction, the channel is provided with a first opening at one end of the inner side surface of the outer rotor, the other end of the inner side surface of the outer rotor is provided with a second opening, and the openings are separated from each other along the length direction of the inner side surface of the outer rotor; the central stator being a cylinder, the central stator having two or more inlet passages and two or more discharge passages, the inlet passages having inlet passage openings at an outer side of the central stator, the discharge passages having discharge passage openings at an outer side of the central stator, the passage openings being arranged to: when an outer rotor first channel end opening is aligned with an inlet passage opening on one of the center stators, the channel other end opening is also aligned with a discharge passage opening on the center stator, the inlet passage opening and each of the discharge passage openings of the center stator being continuously sealed from each other during operation by a sealing area at an inner side of the outer rotor and an outer side of the center stator;
whereby during each revolution of said rotor the passage openings are alternately aligned at least once with the inlet passage openings on one of said central stators and the opposite outlet passage opening on said central stator and then with the outlet passage openings on one of the central stators and the opposite inlet passage opening on said central stator, whereby each of said passages is supplied with said high pressure first fluid at least once and discharges pressurized second fluid at least once, the central stator and the outer rotor being disposed within the housing, the first and second end caps being secured and sealed to the housing with bolts and seals, the first and second end caps being secured and sealed to the central stator with dowel holes and seals, the central stator passing through the first and second end caps, the central stator having a pair of outlet and inlet ducts at each end, each outlet and inlet duct corresponding to a respective outlet and inlet passage.
2. The pressure exchanger of claim 1, wherein the central stator is stationary and the outer rotor revolves around the central stator.
3. A pressure exchanger according to claim 1, wherein the passage openings in the central stator are positioned radially, whereby fluid is directed radially in when entering the passage openings and radially out when exiting the passage openings.
4. A pressure exchanger as claimed in claim 3 wherein said inlet passageway in said one central stator through which said high pressure first fluid flows is curved inwardly of the opening, said curvature forming a directional fluid flow into said outer rotor channels, and the aligned outlet passageway also has a curvature to cause a change in the direction of fluid flow into and out of said channels, thereby turning said outer rotor.
5. A pressure exchanger according to any one of claims 1-4, wherein the outer rotor has a plurality of channels radially distributed about the axis of rotation.
6. The pressure exchanger of claim 5, wherein the channels are equally radially and equiangularly spaced about the axis of rotation.
7. The pressure exchanger of claim 1, wherein the central stator has two spaced apart outer cylindrical bearing surfaces with a perimeter groove therebetween, the perimeter groove being a sump holding fluid for lubricating the bearing surfaces.
8. The pressure exchanger of claim 1, wherein the outer rotor and the center stator are disposed in a housing, and the outer rotor and the center stator are made of pure ceramic type wear-resistant materials, or metal or nylon is made by coating or embedding ceramic type wear-resistant materials on friction surfaces.
9. A method of transferring pressure energy from a high pressure first fluid to a low pressure second fluid using the pressure exchanger of claim 1 to provide a pressurized second fluid, the method comprising the steps of:
rotatably mounting an outer rotor of a circular cylinder outside a central stator of the cylinder and having at least two channels passing axially along the rotor between openings in an inner side of the outer rotor; providing a central stator within said housing, said central stator outer side having a smooth surface area such that said central stator outer side interfaces with and slidingly and sealingly mates with said outer side inner side, said central stator having a plurality of inlet passages and a plurality of discharge passages opening at said outer side area, supplying high pressure first fluid to said inlet passages on one central stator while discharging pressurized second fluid from aligned discharge passages on said central stator on the opposite end, and turning said outer rotor about its axis such that said rotor passage openings on said central stator inlet passage openings and said central stator discharge passage openings are partially or fully aligned at least once per revolution whereby each passage fills and discharges at least once per revolution an increased volume of pressurized second fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610367912.1A CN107398177B (en) | 2016-05-19 | 2016-05-19 | External rotor type pressure exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610367912.1A CN107398177B (en) | 2016-05-19 | 2016-05-19 | External rotor type pressure exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107398177A CN107398177A (en) | 2017-11-28 |
| CN107398177B true CN107398177B (en) | 2023-11-17 |
Family
ID=60389393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610367912.1A Active CN107398177B (en) | 2016-05-19 | 2016-05-19 | External rotor type pressure exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107398177B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005865B (en) * | 2017-12-03 | 2019-07-19 | 国家***天津海水淡化与综合利用研究所 | Radial rotor formula energy recycle device |
| US11572899B2 (en) * | 2020-02-13 | 2023-02-07 | Isobaric Strategies Inc. | Pressure exchanger for hydraulic fracking |
| CN116177675B (en) * | 2023-03-28 | 2023-09-01 | 广东海洋大学 | Fluid residual pressure energy recovery device and sea water desalination system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB680358A (en) * | 1950-01-06 | 1952-10-01 | George Jendrassik | Improvements in or relating to gas pressure exchangers |
| US4174925A (en) * | 1977-06-24 | 1979-11-20 | Cedomir M. Sliepcevich | Apparatus for exchanging energy between high and low pressure systems |
| CN101568733A (en) * | 2006-10-04 | 2009-10-28 | 能量回收股份有限公司 | Rotary pressure transfer device |
| CN101821482A (en) * | 2007-10-05 | 2010-09-01 | 能量回收股份有限公司 | Have and improve the rotary pressure transfer device that flows |
| CN102725538A (en) * | 2009-11-24 | 2012-10-10 | Ghd私人有限公司 | Pressure exchanger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553443B (en) * | 2012-01-17 | 2013-11-13 | 浙江大学 | Misalignment channel autorotation hydraulic rotary piston supercharger |
-
2016
- 2016-05-19 CN CN201610367912.1A patent/CN107398177B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB680358A (en) * | 1950-01-06 | 1952-10-01 | George Jendrassik | Improvements in or relating to gas pressure exchangers |
| US4174925A (en) * | 1977-06-24 | 1979-11-20 | Cedomir M. Sliepcevich | Apparatus for exchanging energy between high and low pressure systems |
| CN101568733A (en) * | 2006-10-04 | 2009-10-28 | 能量回收股份有限公司 | Rotary pressure transfer device |
| CN101821482A (en) * | 2007-10-05 | 2010-09-01 | 能量回收股份有限公司 | Have and improve the rotary pressure transfer device that flows |
| CN102725538A (en) * | 2009-11-24 | 2012-10-10 | Ghd私人有限公司 | Pressure exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107398177A (en) | 2017-11-28 |
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Address after: 315000 017 Exhibition Road 128, Jiangdong District, Ningbo, Zhejiang (7-82-7) Applicant after: Ningbo weak sea Intelligent Technology Co.,Ltd. Address before: 315000 017 Exhibition Road 128, Jiangdong District, Ningbo, Zhejiang (7-82-7) Applicant before: NINGBO ZEZE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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