CN104163470B - A kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method - Google Patents
A kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method Download PDFInfo
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- CN104163470B CN104163470B CN201310488172.3A CN201310488172A CN104163470B CN 104163470 B CN104163470 B CN 104163470B CN 201310488172 A CN201310488172 A CN 201310488172A CN 104163470 B CN104163470 B CN 104163470B
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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
Abstract
The invention discloses a kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method, step: seawater pressurization is divided into stream stock C, D and E, after miscarriage stock C pressurization, input reverse osmosis membrane assembly forms high-pressure thick water stream K and water stream H after desalination is separated; Stream stock D and high-pressure thick water stream K inputs equal pressure energy exchanger respectively after energy transformation, exports High-Pressure Water stock L and low pressure water flow stock N; Low pressure water flow stock N flows into Buffer Pool; Inputting decompress osmosis device respectively with stream stock E after drawing stream stock P pressurization by Buffer Pool makes dense water concentration difference convert hydraulic energy to, decompress osmosis device exports the stream stock T and stream stock R that enter sea, stream stock R and High-Pressure Water stock L inputs turbine type energy exchanger respectively after energy transformation, exports secondary booster water stream M and stream stock S, secondary booster water stream M inputs reverse osmosis membrane assembly, and stream stock S enters sea.The present invention reduces sea water desaltination carbon emission and concentrated water discharge load, is the desalination technology of energy-conservation, low-carbon (LC), environmental protection.
Description
Technical field
The invention belongs to field of seawater desalination, relate to a kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method particularly.
Background technology
The mankind are faced with serious Freshwater resources problem in short supply in 21 century.Sea water desaltination, as the effective way solving Freshwater resources crisis, has obtained the generally approval of countries in the world.Reverse-osmosis Seawater Desalination Technology has without phase transformation, the advantage such as energy consumption is low, simple to operate, easy to maintenance, the construction period is short because of it, has started at present to obtain increasingly extensive application.But, the Social Acceptability of reverse osmosis seawater desalting or on the low side, reason is that reverse osmosis seawater desalting still exists some development obstacles in energy consumption, cost, environmental influence etc., do not meet the demand of wider scope water object, need to improve a lot of local continuation such as Revere Osmosis Process System designs.
Reverse osmosis technology belongs to pressure-actuated membrane separation technique, and fresh water and salt solution are organically separated by the semipermeable partition adopted in its lock out operation.Have osmotic pressure in semipermeable partition both sides because of concentration difference, when only having the working pressure of charging seawater to be greater than the osmotic pressure of seawater, the fresh water in seawater just can be made separated by semi-permeable membranes.Reverse osmosis seawater desalting process nature is the process of a kind of " exchanging Freshwater resources for the energy ", energy cost constitutes the prime cost of reverse osmosis seawater desalting, and energy-saving and cost-reducing becoming breaks through the main path that limitation is applied in sea water desaltination.Usually, for urnormal (saltiness 35000mg/L, osmotic pressure is about 2.5MPa), the working pressure of reverse osmosis seawater desalination system is generally at 5.0 ~ 6.0MPa, and the dense water pressure of discharging from membrane module is still up to 4.8 ~ 5.8MPa.If the Water Sproading rate according to usual 40% calculates, about there is the feed pressure energy of 60% in dense water, there is huge recovery value and meaning.Meanwhile, the dense water that reverse osmosis seawater desalting produces contains higher saltiness, concentration is close to 2 times of former seawater, direct discharge can have a negative impact to ocean environment, especially for large reverse osmosis Seawater Desalination Project, its concentrated water discharge probably causes negative impact to discharge outlet ambient ocean species, destroys its original habitat, cause species to be migrated or the destruction Of resources, cause marine ecology degenerate or worsen.
For reducing the system energy consumption of reverse osmosis seawater desalting, the way generally adopted both at home and abroad at present reclaims relative straightforward visible pressure energy in the dense water of reverse osmosis seawater desalting, but ignores the potential concentration difference energy that dense water supersalinity contains.If the concentration difference of dense water can be recycled utilization, not only effectively can reduce the system energy consumption of reverse osmosis seawater desalting and make water cost, also can reduce sea water desaltination carbon emission and concentrated water discharge load, weaken the impact of sea water desaltination on environment.
Summary of the invention
The object of this invention is to provide a kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method.
Technical scheme of the present invention is summarized as follows:
A kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method, comprises the steps:
Extra large water stream A through sea water preprocessing device 1 purifying treatment is formed pressurized stream stock B by working shaft 2, pressurized stream stock B is divided into stream stock C, stream stock D and stream stock E, and miscarriage stock C is entered by pipeline and inputs reverse osmosis membrane assembly 4 after high-pressure pump 3 is pressurizeed form high-pressure thick water stream K and water stream H after desalination is separated; Produce water stream H after preprocessor 10 processes by pipeline supply water object; Stream stock D and high-pressure thick water stream K inputs equal pressure energy exchanger 5 respectively after energy transformation, exports High-Pressure Water stock L and low pressure water flow stock N; Low pressure water flow stock N flows into Buffer Pool 6; The stream stock P drawn by Buffer Pool 6 inputs decompress osmosis device 8 respectively with stream stock E after dense water pump 7 pressurizes makes dense water concentration difference convert hydraulic energy to, decompress osmosis device 8 output stream stock T and stream stock R, stream stock T enters sea, stream stock R and High-Pressure Water stock L inputs turbine type energy exchanger 9 respectively after energy transformation, exports secondary booster water stream M and stream stock S, secondary booster water stream M inputs reverse osmosis membrane assembly 4 and produces fresh water, and stream stock S enters sea.
Advantage of the present invention:
The present invention is from utilizing the dense Water Energy value of reverse osmosis seawater desalting, according to the feature of sea water desaltination dense water high pressure, high salt, reverse osmosis seawater desalting dense water cascaded utilization of energy mode is proposed, be specially, the first echelon uses equal pressure energy exchanger directly to reclaim the pressure energy of the dense water of reverse osmosis seawater desalting; The concentration difference of dense for reverse osmosis seawater desalting water can be converted to hydraulic energy by decompress osmosis device by the second echelon, and re-using turbine type energy exchanger is the high pressure sea water secondary booster that the first echelon produces, thus realizes the energy-saving and emission-reduction of sea water desaltination.This dense water cascaded utilization of energy pattern, change reverse osmosis seawater desalination system in the past and only reclaim the Technology that dense water pressure can not reclaim its concentration difference energy, so not only can reduce the overall energy consumption of reverse osmosis seawater desalination system and running cost, also can reduce sea water desaltination carbon emission and concentrated water discharge load, be the desalination technology of a kind of relatively energy-conservation, low-carbon (LC), environmental protection.
In addition, the seepage-resisting sea-water desalting process that the present invention relates to and device also have modularization, the easily advantage such as amplification and short implementation cycle, easy to utilize.
Accompanying drawing explanation
Fig. 1 is a kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method schematic diagram of the present invention.
Embodiment
A kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method, comprises the steps:
Extra large water stream A through sea water preprocessing device 1 purifying treatment is formed pressurized stream stock B by working shaft 2, pressurized stream stock B is divided into stream stock C, stream stock D and stream stock E, and miscarriage stock C is entered by pipeline and inputs reverse osmosis membrane assembly 4 after high-pressure pump 3 is pressurizeed form high-pressure thick water stream K and water stream H after desalination is separated; Produce water stream H after preprocessor 10 processes by pipeline supply water object; Stream stock D and high-pressure thick water stream K inputs equal pressure energy exchanger 5 respectively after energy transformation, exports High-Pressure Water stock L and low pressure water flow stock N; Low pressure water flow stock N flows into Buffer Pool 6; The stream stock P drawn by Buffer Pool 6 inputs decompress osmosis device 8 respectively with stream stock E after dense water pump 7 pressurizes makes dense water concentration difference convert hydraulic energy to, decompress osmosis device 8 output stream stock T and stream stock R, stream stock T enters sea, stream stock R and High-Pressure Water stock L inputs turbine type energy exchanger 9 respectively after energy transformation, exports secondary booster water stream M and stream stock S, secondary booster water stream M inputs reverse osmosis membrane assembly 4 and produces fresh water, and stream stock S enters sea.
Claims (1)
1. a dense water cascaded utilization of energy reverse osmosis seawater desalting method, it is characterized in that comprising the steps: that the extra large water stream A by through sea water preprocessing device (1) purifying treatment forms pressurized stream stock B by working shaft (2), pressurized stream stock B is divided into stream stock C, stream stock D and stream stock E, and stream stock C inputs reverse osmosis membrane assembly (4) after entering high-pressure pump (3) pressurization by pipeline and after desalination is separated, forms high-pressure thick water stream K and produces water stream H; Produce water stream H after preprocessor (10) process by pipeline supply water object; Stream stock D and high-pressure thick water stream K inputs equal pressure energy exchanger (5) respectively after energy transformation, exports High-Pressure Water stock L and low pressure water flow stock N; Low pressure water flow stock N flows into Buffer Pool (6); The stream stock P drawn by Buffer Pool (6) inputs decompress osmosis device (8) respectively with stream stock E after dense water pump (7) pressurization makes dense water concentration difference convert hydraulic energy to, decompress osmosis device (8) output stream stock T and stream stock R, stream stock T enters sea, stream stock R and High-Pressure Water stock L inputs turbine type energy exchanger (9) respectively after energy transformation, exports secondary booster water stream M and stream stock S, secondary booster water stream M inputs reverse osmosis membrane assembly (4) and produces fresh water, and stream stock S enters sea.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310488172.3A CN104163470B (en) | 2013-10-17 | 2013-10-17 | A kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method |
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| CN201310488172.3A CN104163470B (en) | 2013-10-17 | 2013-10-17 | A kind of dense water cascaded utilization of energy reverse osmosis seawater desalting method |
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| CN104163470B true CN104163470B (en) | 2015-09-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6658198B2 (en) * | 2016-03-28 | 2020-03-04 | 東洋紡株式会社 | Fresh water system |
| CN109095561A (en) * | 2017-06-21 | 2018-12-28 | 北京天诚同创电气有限公司 | Reverse osmosis seawater desalting method and system |
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| JP3787681B2 (en) * | 2002-08-23 | 2006-06-21 | 日立造船株式会社 | Seawater desalination method by reverse osmosis |
| JP5912506B2 (en) * | 2011-12-20 | 2016-04-27 | カヤバ システム マシナリー株式会社 | Seawater desalination equipment |
| CN202643511U (en) * | 2012-07-10 | 2013-01-02 | 福建省水产研究所 | Low-carbon seawater staged utilization equipment |
| CN103172189A (en) * | 2013-04-09 | 2013-06-26 | 中国科学院化学研究所 | Device for generating power by utilizing osmosis energy |
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