CN102107921A - 'Outside-cylinder parallel-connection type' non-condensable gas removing device in low-temperature multi-effect seawater desalination system - Google Patents
'Outside-cylinder parallel-connection type' non-condensable gas removing device in low-temperature multi-effect seawater desalination system Download PDFInfo
- Publication number
- CN102107921A CN102107921A CN2009102613771A CN200910261377A CN102107921A CN 102107921 A CN102107921 A CN 102107921A CN 2009102613771 A CN2009102613771 A CN 2009102613771A CN 200910261377 A CN200910261377 A CN 200910261377A CN 102107921 A CN102107921 A CN 102107921A
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- Prior art keywords
- condensable gas
- effect
- low
- seawater desalination
- desalination system
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- 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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- 239000013535 sea water Substances 0.000 title claims abstract description 38
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 14
- 239000013505 freshwater Substances 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000004821 distillation Methods 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 239000012267 brine Substances 0.000 claims description 20
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000006200 vaporizer Substances 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract 4
- 239000000463 material Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 43
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Classifications
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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
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention belongs to the technical field of seawater desalination, and relates to an 'outside-cylinder parallel-connection type' non-condensable gas removing device in a low-temperature multiple-effect distillation seawater desalination system. The low-temperature multi-effect distillation seawater desalination system comprises a multiple-effect evaporator, a steam injector, a steam condenser, the 'outside-cylinder parallel-connection type' non-condensable gas removing device, a concentrated saltwater heat exchanger, a fresh water heat exchanger, a seawater material feeding pump, a concentrated saltwater pump and a fresh water pump, wherein, the 'outside-cylinder parallel-connection type' non-condensable gas removing device comprises non-condensable gas extraction pipes respectively arranged a heating steam side of each effect evaporator and outside a cylinder body of the steam condenser, valves arranged on the non-condensable gas extraction pipes, a main pipe and a vacuum pumping device; the non-condensable gas extraction pipes are connected in parallel to the main pipe; a high pressure end of the main pipe is connected with the non-condensable gas extraction pipes; and a low pressure end of the main pipe is connected with the vacuum pumping equipment. The low-temperature multiple-effect distillation seawater desalination system disclosed by the utility model can avoid or reduce the accumulation of non-condensable gas on the inner wall of a heat exchange pipe, improve the heat exchange efficiency of the multiple-effect evaporator, and ensures that a reasonable pressure difference is formed among the effect evaporators at the inner parts of the multiple-effect evaporator meanwhile.
Description
Technical field
The invention belongs to field of sea water desalting technology, relate to the remover of non-condensable gas in a kind of low temperature multiple-effect distillation seawater desalination system.
Background technology
When utilizing the low-temperature multiple-effect seawater desalination system to carry out sea water desaltination, the incoagulability gas in the system (being called for short " non-condensable gas ") need be extracted out.Non-condensable gas mainly contains two sources: the one, and from the release of seawater.Be dissolved with a certain amount of noncondensable gas in the seawater, comprise oxygen, nitrogen and carbonic acid gas etc.The low temperature multiple-effect distillation sea water desalting process is to operate under vacuum condition, in the normal course of operation, whole device is inner to be pumped to-70～-vacuum of 90kPa.When seawater enters vacuum apparatus, because pressure reduces, the portion gas that is dissolved in the seawater will be released.In addition, because device interior is in vacuum state, internal pressure is lower than ambient pressure environment, and outside air also will leak into equipment from flange, manhole, door closure etc.
These discharge from seawater and the gas that leaks into from the external world can't condensation under the device normal operating condition, and with its discharge, on the one hand, these noncondensable gases will constantly gather as untimely, cause device interior pressure to raise, and vacuum is destroyed; On the other hand, the gas accumulation of these thermal conductivity extreme differences is on the heat transfer tube surface, and the heat exchanging process causes obstruction.
In the existing low-temperature multiple-effect seawater desalination system, be provided with dividing plate between the heating steam side of every single-effect evaporator and the evaporation of seawater side, open communicating aperture on the dividing plate, non-condensable gas is imitated to the end effect from head by these communicating apertures and is flowed by imitating, and enters condenser with end effect secondary steam at last.Condenser links to each other with vaccum-pumping equipment, and the secondary steam of imitating from the end is condensed into water in condenser, and remaining non-condensable gases then is evacuated equipment and takes away.When non-condensable gas enters vaporizer, steam enters in the heat transfer tube as mixture with non-condensable gas, steam is condensed into water near the heat transfer tube wall, the residue non-condensable gases accumulates in the heat transfer tube inner-wall surface, form one deck air film, the thermal conductivity extreme difference of non-condensable gases, thereby heat transfer caused obstruction.Along with compiling by imitating of non-condensable gas, from the first evaporator to the last evaporator, the non-condensable gas amount constantly increases, and to the heat transfer of vaporizer, especially the heat transfer of several single-effect evaporators in back forms and hinders, and reduces the heat exchange efficiency of vaporizer greatly.
Summary of the invention
The incondensable gas remover that the purpose of this invention is to provide " tube loong shunt formula " in a kind of low-temperature multiple-effect seawater desalination system.
Describe for convenient, content of the present invention will be used following term, but these terms can not limit the present invention.
" head end " that uses in the content of the present invention, " front end " are depended on nearly steam ejector end, and nearly condenser end is depended in " end ", " rear end ".
" the heating steam side " used in the content of the present invention, " evaporation of seawater side " and " secondary steam side " refer to: the structure that the liquid distributor by horizontally disposed heat-exchanging tube bundle, tube bank top in each single-effect evaporator, the tube sheet at tube bank two ends constitute, " evaporation of seawater side " for this single-effect evaporator, " evaporation of seawater side " front end was " a heating steam side " in each was imitated, and the rear end is " a secondary steam side "; " the heating steam side " that imitate back one and " the secondary steam side " of last effect spatially are communicated with.
" low pressure end " that uses in the content of the present invention refers to female the pipe and the vaccum-pumping equipment coupling end, and " high-pressure side " refers to female pipe and each effect non-condensable gas fairlead coupling end.
Low-temperature multiple-effect seawater desalination of the present invention system comprises multiple-effect evaporator, steam ejector, condenser, the non-condensable gas remover, the strong brine interchanger, the fresh water interchanger, the seawater feeding pump, the strong brine pump, fresh water pump, the head and the tail series connection successively of each single-effect evaporator, steam ejector links to each other respectively with middle 1st effective evaporator end with the first single-effect evaporator head end, condenser links to each other with last evaporator is terminal, strong brine pump and fresh water pump are connected on outlet of last evaporator strong brine and water outlet respectively, strong brine interchanger and fresh water interchanger are connected on strong brine pump discharge and fresh water pump outlet respectively, the seawater feeding pump links to each other with the fresh water interchanger with the strong brine interchanger respectively, and the fresh water interchanger links to each other with the condenser sea intake with the strong brine interchanger.
Wherein, described non-condensable gas remover comprises: the valve that is provided with on the outer non-condensable gas fairlead that is provided with respectively of each single-effect evaporator heating steam side and condenser cylindrical shell, each non-condensable gas fairlead, female pipe and vacuum extractor; Wherein each non-condensable gas fairlead is parallel on the female pipe; Female pipe high-pressure side links to each other with each non-condensable gas fairlead, and female pipe low pressure end links to each other with vaccum-pumping equipment.
Wherein said fairlead valve can also replace with orifice plate.
As the preferred embodiment of the invention, described non-condensable gas fairlead is arranged on the outer top of cylindrical shell.
As the preferred embodiment of the invention, described vacuum extractor can be stream-jet ejector, water jet air ejector or water-ring vacuum pump etc.
As the preferred embodiment of the invention, described multiple-effect evaporator internal pressure is imitated the end from head and is imitated reduction gradually.
Usefulness of the present invention is: each single-effect evaporator all is provided with the non-condensable gas fairlead, the non-condensable gas that each single-effect evaporator produces is drawn respectively separately, and be pooled on female pipe, extract out by vacuum extractor, avoid or alleviate non-condensable gas gathering on the heat transfer tube inwall, improve the heat exchange efficiency of vaporizer.Simultaneously on the non-condensable gas fairlead, valve is set, each is imitated the actual motion differential pressure conditions carry out online adjusting, guarantee that vaporizer inside forms rational pressure difference between respectively imitating.
Description of drawings
Fig. 1 is a structural representation of the present invention, and wherein 1 is stream-jet ejector, and 2 is sextuple-effect evaporators, 3 is quintuple effect evaporators, the 4th, and fourth evaporator, the 5th, third effect evaporator, 6 is second single-effect evaporators, and 7 is first single-effect evaporators, the 8th, and steam ejector, the 9th, seawater feeding pump, the 10th, strong brine pump, the 11st, strong brine interchanger, the 12nd, fresh water interchanger, the 13rd, fresh water pump, the 14th, condenser, the 15th, non-condensable gas fairlead, the 16th, female pipe, the 17th, valve.
Embodiment
Now with specific embodiment the present invention is described in conjunction with the accompanying drawings, but the present invention is not limited to this.
The low-temperature multiple-effect seawater desalination system, comprise 6 single-effect evaporator 2-7, steam ejector 8, condenser 14, the non-condensable gas remover, strong brine interchanger 11, fresh water interchanger 12, seawater feeding pump 9, strong brine pump 10, fresh water pump 13, the head and the tail series connection successively of each single-effect evaporator, steam ejector 8 links to each other respectively with fourth evaporator 4 ends with first single-effect evaporator, 7 head ends, condenser 14 and 2 terminal linking to each other of sextuple-effect evaporator, strong brine pump 10 and fresh water pump 13 are connected on outlet of sextuple-effect evaporator 2 strong brines and water outlet respectively, strong brine interchanger 11 and fresh water interchanger 12 are connected on 10 outlets of strong brine pump and fresh water pump 13 outlets respectively, seawater feeding pump 9 links to each other with fresh water interchanger 12 with strong brine interchanger 11 respectively, and fresh water interchanger 12 links to each other with condenser 14 sea intakes with strong brine interchanger 11.Wherein, the non-condensable gas remover comprises non-condensable gas fairlead 15, valve 17, female pipe 16 and stream-jet ejector 1, non-condensable gas fairlead 15 is arranged on each single-effect evaporator heating steam side and the outer top of condenser 14 cylindrical shells, valve 17 is set on the fairlead 15, each non-condensable gas fairlead 17 is connected in parallel to female pipe 16 high-pressure sides, and female pipe 16 low pressure ends link to each other with stream-jet ejector 1.
When carrying out sea water desaltination with native system, seawater pumps into system by seawater feeding pump 9, behind fresh water interchanger 12 and strong brine interchanger 11, enters condenser 14, enters each single-effect evaporator 2-7 more respectively.Because each single-effect evaporator all is in vacuum state, non-condensable gasess such as the oxygen in the seawater, nitrogen, carbonic acid gas are partly discharged, and the secondary steam that goes out along with evaporation of seawater flows to next effect or condenser 14 together.Imitate secondary steam at next and be condensed into water, the residue noncondensable gas flows out from the non-condensable gas venting port at each single-effect evaporator cylindrical shell top, enters corresponding non-condensable gas fairlead 15, is collected to female pipe 16 again, utilizes stream-jet ejector 1 to extract out.Non-condensable gas in the condenser 14 is also drawn by the non-condensable gas fairlead 15 at condenser 14 tops, is collected in female pipe 16, extracts out by stream-jet ejector 1.
Be in operation, imitate 7 to the 6th from first and imitate 2 reductions gradually, valve 17 is set on non-condensable gas fairlead 15, can imitate practical operation situation according to each and carry out online adjusting, set up normal pressure reduction between onset for guaranteeing the evaporation unit internal pressure.
Claims (6)
1. the remover of non-condensable gas in the low-temperature multiple-effect seawater desalination system, described low temperature multiple-effect distillation seawater desalination system comprises multiple-effect evaporator, steam ejector, condenser, non-condensable gas remover, strong brine interchanger, fresh water interchanger, seawater feeding pump, strong brine pump and fresh water pump, it is characterized in that described non-condensable gas remover comprises: the valve that is provided with on the outer non-condensable gas fairlead that is provided with respectively of each single-effect evaporator heating steam side and condenser cylindrical shell, each non-condensable gas fairlead, female pipe and vacuum extractor; Wherein each non-condensable gas fairlead is parallel on the female pipe; Female pipe high-pressure side links to each other with each non-condensable gas fairlead, and female pipe low pressure end links to each other with vaccum-pumping equipment.
2. device according to claim 1 is characterized in that described valve can replace with orifice plate.
3. device according to claim 1 is characterized in that, each non-condensable gas fairlead is arranged on the outer top of cylindrical shell.
4. device according to claim 1 is characterized in that, vacuum extractor is stream-jet ejector, water jet air ejector or water-ring vacuum pump.
5. device according to claim 1 is characterized in that, the vaporizer internal pressure is imitated the end from head and imitated reduction gradually.
6. device according to claim 1 is characterized in that, non-condensable gas is pooled to female pipe by the non-condensable gas fairlead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102613771A CN102107921A (en) | 2009-12-23 | 2009-12-23 | 'Outside-cylinder parallel-connection type' non-condensable gas removing device in low-temperature multi-effect seawater desalination system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102613771A CN102107921A (en) | 2009-12-23 | 2009-12-23 | 'Outside-cylinder parallel-connection type' non-condensable gas removing device in low-temperature multi-effect seawater desalination system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102107921A true CN102107921A (en) | 2011-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102613771A Pending CN102107921A (en) | 2009-12-23 | 2009-12-23 | 'Outside-cylinder parallel-connection type' non-condensable gas removing device in low-temperature multi-effect seawater desalination system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102107921A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381734A (en) * | 2011-09-26 | 2012-03-21 | 中国电子工程设计院 | Low-temperature multi-effect seawater distillation and desalination system and method for sweater desalination |
| CN102557168A (en) * | 2011-12-05 | 2012-07-11 | 北京朗新明环保科技有限公司 | Heat-pipe low-temperature multi-effect sea water desalinating system and process flow |
| CN103588254A (en) * | 2013-09-12 | 2014-02-19 | 东北林业大学 | Low-pressure multi-effect circulating seawater desalting system |
| CN117547843A (en) * | 2024-01-12 | 2024-02-13 | 河北绿鸿环保科技有限公司 | Comprehensive utilization method and system for strong brine and sintering machine head ash |
-
2009
- 2009-12-23 CN CN2009102613771A patent/CN102107921A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381734A (en) * | 2011-09-26 | 2012-03-21 | 中国电子工程设计院 | Low-temperature multi-effect seawater distillation and desalination system and method for sweater desalination |
| CN102557168A (en) * | 2011-12-05 | 2012-07-11 | 北京朗新明环保科技有限公司 | Heat-pipe low-temperature multi-effect sea water desalinating system and process flow |
| CN103588254A (en) * | 2013-09-12 | 2014-02-19 | 东北林业大学 | Low-pressure multi-effect circulating seawater desalting system |
| CN103588254B (en) * | 2013-09-12 | 2015-01-07 | 东北林业大学 | Low-pressure multi-effect circulating seawater desalting system |
| CN117547843A (en) * | 2024-01-12 | 2024-02-13 | 河北绿鸿环保科技有限公司 | Comprehensive utilization method and system for strong brine and sintering machine head ash |
| CN117547843B (en) * | 2024-01-12 | 2024-03-15 | 河北绿鸿环保科技有限公司 | Comprehensive utilization method and system for strong brine and sintering machine head ash |
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Application publication date: 20110629 |