CN101745240B - Method and device for pumping out incondensable gas between effects of multi-effect distillation system - Google Patents
Method and device for pumping out incondensable gas between effects of multi-effect distillation system Download PDFInfo
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- CN101745240B CN101745240B CN2009101464318A CN200910146431A CN101745240B CN 101745240 B CN101745240 B CN 101745240B CN 2009101464318 A CN2009101464318 A CN 2009101464318A CN 200910146431 A CN200910146431 A CN 200910146431A CN 101745240 B CN101745240 B CN 101745240B
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- 238000004821 distillation Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000694 effects Effects 0.000 title abstract description 15
- 238000005086 pumping Methods 0.000 title abstract 2
- 239000013535 sea water Substances 0.000 claims abstract description 34
- 238000001704 evaporation Methods 0.000 claims abstract description 10
- 238000000605 extraction Methods 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 239000000284 extract Substances 0.000 description 5
- 238000010612 desalination reaction Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
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Abstract
The invention discloses a method for removing incondensable gas from a multi-effect distillation system. The method comprises the following steps that: except a last effect evaporator, incondensable gas and uncondensed vapor in a tube pass of each effect evaporator are led to the shell side of the last effect evaporator by an incondensable gas channel on an incondensable gas pumping-out opening to be mixed with seawater vapor generated by evaporating seawater in the last effect evaporator, and then the mixed gas enters the tube pass of the next effect evaporator; and the incondensable gas and the uncondensed vapor in the tube pass of the last effect evaporator enter a condenser, which is arranged outside the system, from the incondensable gas pumping-out opening for enriching and then enter the atmosphere. The method has the advantages of simplifying the pumping process of the incondensable gas out of the multi-effect distillation system, simplifying a process flow and lowering production cost.
Description
Technical field
The present invention relates to desalination technology, be specifically related to the extraction method and the device thereof of on-condensible gas in a kind of seawater multi-effect distillation system.
Background technology
Desalinization is for to be converted into fresh water with seawater desalination.Desalinization at present mainly adopts hot method to carry out the desalination of seawater, and hot method is based on the principle of evaporation and condensation.The technology that adopts hot method to carry out desalinization is mainly multistage flash evaporation method and multiple-effect distillation at present, wherein multiple-effect distillation is: allow the seawater of heating evaporate in the evaporimeter of a plurality of series connection, each evaporimeter claims " effect " again, the steam conduct that preceding 1st effective evaporator is evaporated is the thermal source of 1st effective evaporator down, and being condensed into fresh water, multi-effect distillation system is general main to comprise steam-supplying system, water distribution system, steam-generating bank etc.
When adopting multi-effect distillation system to carry out desalinization, contain a certain amount of on-condensible gas in the seawater and in the evaporation heat transfer process, can overflow, evaporator operation also has on-condensible gas and bleeds under negative pressure.In order to guarantee to conduct heat and the foundation of vacuum, each single-effect evaporator of multi-effect distillation system all needs on-condensible gas is extracted out, common technical scheme is extracted mouth out for on-condensible gas is set in every single-effect evaporator, extract on-condensible gas out evaporimeter by withdrawing device, be drained in the atmosphere, yet the shortcoming of taking this extraction method is the debugging that needs to carry out different pressures between every single-effect evaporator, to guarantee that the pressure differential between each single-effect evaporator keeps identical with designing requirement, and along with the effect number of multi-effect evaporator increases, extract mouth out also increases thereupon, the evaporation structure more complicated that also becomes simultaneously, thereby caused design, the increase of installation and operation cost.
Summary of the invention
The present invention is directed to above technological deficiency extraction method and the device thereof that does not coagulate steam in a kind of new multi-effect distillation system is provided, multi-effect distillation system described in the present invention be the multi-effect distillation system more than the triple effect at least.
The extraction method that does not coagulate steam in the multi-effect distillation system of the present invention is: except that last evaporator, since first single-effect evaporator, the on-condensible gas passage that on-condensible gas in each single-effect evaporator tube side and uncondensated steam are extracted mouthful position out by fixed gas be incorporated in this single-effect evaporator shell-side with this single-effect evaporator in the seawater vapor mixing that produces of evaporation of seawater, enter into down then in the tube side of 1st effective evaporator; On-condensible gas in the last evaporator tube side and uncondensated steam are taken out the port of export by the on-condensible gas of last evaporator and are entered enrichment in the condenser outside the system, enter atmosphere then.
Do not coagulate in the steam extraction method in the multi-effect distillation system of the present invention, when on-condensible gas in the last 1st effective evaporator tube side and uncondensated steam enter next effect by the on-condensible gas passage, because the increase of throttling and flow velocity, it is poor to produce certain pressure, and described pressure differential should be guaranteed to equate with absolute pressure difference between two imitate.Be that on-condensible gas in every single-effect evaporator tube side and uncondensated steam should not change the pressure differential between this single-effect evaporator and the following 1st effective evaporator in entering the shell-side of this single-effect evaporator and during the seawater vapor mixing.
The present invention also provides the withdrawing device of on-condensible gas in the multi-effect distillation system, described multi-effect distillation system comprises: water-distributing device, multi-effect evaporator, steam-jet ejector, condenser and vacuum extractor, wherein, in described system, except that last evaporator, the on-condensible gas passage of the on-condensible gas of each single-effect evaporator extraction mouthful position connects the shell-side of this single-effect evaporator.The on-condensible gas passage that to be on-condensible gas in each single-effect evaporator tube side and uncondensated steam extract mouthful position out by fixed gas be incorporated in this single-effect evaporator shell-side with this single-effect evaporator in the seawater vapor mixing that produces of evaporation of seawater, enter into down then in the tube side of 1st effective evaporator.The on-condensible gas passage that the on-condensible gas of last evaporator is extracted mouthful position out is connected with condenser; Condenser connects vacuum extractor.On-condensible gas in the last evaporator tube side and uncondensated steam enter enrichment in the condenser outside the system by the on-condensible gas passage of last evaporator, enter atmosphere by vacuum extractor then.
In the seawater multi-effect distillation system of the present invention, material seawater supply line at first passes through condenser then by the water-distributing device cloth seawater in every single-effect evaporator in the multi-effect evaporator.
In the seawater multi-effect distillation system of the present invention, steam-jet ejector steam (vapor) outlet end links to each other with first single-effect evaporator, and steam-jet ejector steam inlet end links to each other with a part of seawater steam (vapor) outlet end in the last evaporator.
In the seawater multi-effect distillation system of the present invention, the on-condensible gas outlet links to each other with condenser by the on-condensible gas passage in the terminal bobbin carriage of second tube side of last evaporator; A part of seawater steam (vapor) outlet end of last evaporator links to each other with steam-jet ejector steam inlet end, and the port of export of another part seawater steam of last evaporator links to each other with condenser.
In the seawater multi-effect distillation system of the present invention, condenser links to each other with vacuum extractor.
In the seawater multi-effect distillation system of the present invention, be provided with demister between each single-effect evaporator.
The workflow that on-condensible gas is extracted out in the multi-effect distillation system of the present invention is: entered by the pipe side of first single-effect evaporator by the steam of steam-jet ejector output in first tube side of first single-effect evaporator and cool off, seawater to the institute of the water-distributing device in evaporimeter cloth heats simultaneously, the gas that cools off in first tube side enters the gas-liquid separation device of first single-effect evaporator, uncongealed gas enters the little bobbin carriage of the second tube side end through second tube side, then by the on-condensible gas passage enter in the shell-side of first single-effect evaporator with this single-effect evaporator in the seawater vapor mixing that produces of evaporation of seawater, mixed on-condensible gas and seawater steam enter down in the tube side of 1st effective evaporator, carry out similar first circulation of imitating again, up to last evaporator, the on-condensible gas passage that on-condensible gas in the last evaporator tube side is extracted mouthful position out through on-condensible gas directly enters enrichment in the outer condenser of evaporimeter, extract system out by vacuum extractor then, enter atmosphere.
The present invention has simplified the extraction technology of on-condensible gas in the multi-effect distillation system, has simplified technological process, has reduced production cost.
Description of drawings
Accompanying drawing 1 is that on-condensible gas is extracted schematic flow sheet out in the multi-effect distillation system.
The specific embodiment
The technological process that the present invention extracts out on-condensible gas of the present invention with the triple effect Distallation systm describes, but the invention is not restricted to the triple effect Distallation systm, also can be that quadruple effect, five is imitated, six imitated or the Distallation systm of multiple-effect more.
The line of band arrow is represented the flow path of on-condensible gas among Fig. 1.The steam that comes out from steam jet ejector 10 enters the 1st and imitates cold pipe side 1 and carry out condensation, contains on-condensible gas in the steam.In first tube side 2 of the 1st single-effect evaporator after the condensation, most of steam is condensed into distilled water, remainder steam and on-condensible gas are in big bobbin carriage 3 after the vapor-liquid separation, and after the steam that contains on-condensible gas continued to enter in the 1st second tube side 4 of imitating further condensation, on-condensible gas content increased; Enter then in the end-tube case 5 of second tube side 4, enter in first shell-side 7 of imitating by on-condensible gas passage 6 between imitating afterwards, the indirect steam that goes out with evaporation of seawater in this single-effect evaporator shell-side mixes, pass in the tube side that demister 8 enters down 1st effective evaporator, as the heating steam of 1st effective evaporator down, condensation in two tube sides once more, on-condensible gas content increases by imitating, and the like, fixed gas transmits between imitating imitates until the end.Imitate at the end, the on-condensible gas after compiling is imitated in the condenser 9 that directly enters by the on-condensible gas passage in the tubule case 5 of distiller in the end, imitates to avoid being circulated again into first by steam-jet ejector 10.The indirect steam part that last evaporator produces is mixed with the power steam that drives steam-jet ejector 10 as the heating steam of first effect by steam-jet ejector 10 suction compression backs and recycling, remaining indirect steam then is introduced into condenser 9 condensations, therefore, fixed gas in the system is enrichment in condenser 9 all, and finally is evacuated device 11 extraction systems with uncondensated steam in condenser 9 and enters atmosphere.
Claims (7)
1. the extraction method of on-condensible gas in the multi-effect distillation system, it is characterized in that, described method comprises: except that last evaporator, the on-condensible gas passage that on-condensible gas in each single-effect evaporator tube side and uncondensated steam are extracted mouthful position out by on-condensible gas be incorporated in this single-effect evaporator shell-side with this single-effect evaporator in the seawater vapor mixing that produces of evaporation of seawater, enter into down then in the tube side of 1st effective evaporator; On-condensible gas in the last evaporator tube side and uncondensated steam are extracted mouth out by the on-condensible gas of last evaporator and are entered enrichment in the condenser outside the system, enter atmosphere then; The indirect steam part that last evaporator produces is mixed the heating steam of imitating as first by steam-jet ejector suction compression back with the power steam that drives steam-jet ejector.
2. method according to claim 1, it is characterized in that, on-condensible gas in described every single-effect evaporator tube side and uncondensated steam in entering the shell-side of this single-effect evaporator and seawater produce vapor mixing the time should not change pressure differential between this single-effect evaporator and the following 1st effective evaporator.
3. the multi-effect distillation system of claim 1 or 2 described methods condensing body withdrawing device not, described multi-effect distillation system comprises water-distributing device, multi-effect evaporator, steam-jet ejector (10), condenser (9) and vacuum extractor (11), it is characterized in that, except that last evaporator, the on-condensible gas passage of the on-condensible gas of each single-effect evaporator extraction mouthful position connects the shell-side of this single-effect evaporator; The on-condensible gas passage that the last evaporator on-condensible gas is extracted mouthful position out is connected with condenser (9); Condenser (9) connects vacuum extractor (11); Steam-jet ejector in the described multi-effect distillation system (10) steam (vapor) outlet end links to each other with first single-effect evaporator, and steam-jet ejector (10) steam inlet end links to each other with a part of seawater steam (vapor) outlet end in the last evaporator.
4. not condensing body withdrawing device according to claim 3 is characterized in that, the material seawater supply line in the described multi-effect distillation system is at first by the water-distributing device in condenser (9) the back connection multi-effect evaporator.
5. not condensing body withdrawing device according to claim 4 is characterized in that, the outlet of the on-condensible gas of the terminal bobbin carriage (5) of second tube side of last evaporator links to each other with condenser (9) by the on-condensible gas passage in the described multi-effect distillation system; A part of seawater steam (vapor) outlet end in the last evaporator links to each other with steam-jet ejector (10) steam inlet end, and the port of export of another part seawater steam in the last evaporator links to each other with condenser (9).
6. not condensing body withdrawing device according to claim 5 is characterized in that the condenser in the described multi-effect distillation system (9) links to each other with vacuum extractor (11).
7. not condensing body withdrawing device according to claim 6 is characterized in that, is provided with demister (8) in the described multi-effect distillation system between each single-effect evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101464318A CN101745240B (en) | 2008-12-02 | 2009-06-03 | Method and device for pumping out incondensable gas between effects of multi-effect distillation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810227765 | 2008-12-02 | ||
| CN200810227765.3 | 2008-12-02 | ||
| CN2009101464318A CN101745240B (en) | 2008-12-02 | 2009-06-03 | Method and device for pumping out incondensable gas between effects of multi-effect distillation system |
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| Publication Number | Publication Date |
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| CN101745240A CN101745240A (en) | 2010-06-23 |
| CN101745240B true CN101745240B (en) | 2011-12-21 |
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| CN104098214B (en) * | 2014-07-28 | 2016-02-10 | 神华集团有限责任公司 | Containing wastewater from catalyst treatment system |
| CN104193060A (en) * | 2014-08-29 | 2014-12-10 | 中国五环工程有限公司 | Multiple-effect evaporation technique and system for coal chemical industry device concentrated brine |
| CN108439513B (en) * | 2018-05-29 | 2024-03-01 | 长沙鑫本药业有限公司 | Low-temperature atomization evaporator for wastewater |
| CN109675338B (en) * | 2019-01-22 | 2023-08-22 | 天津乐科节能科技有限公司 | Working method of exhaust steam compression condensation type vacuum multi-effect evaporation crystallization system |
| CN111747466B (en) * | 2020-06-24 | 2022-05-10 | 武汉润德工程技术有限公司 | Self-driven seawater desalination device and method |
| CN112611253B (en) * | 2020-12-01 | 2022-06-07 | 内蒙古金石镁业有限公司 | Automatic cleaning device for cooler and cleaning control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87200655U (en) * | 1987-01-20 | 1988-01-06 | 大连工学院 | Flexible conduit falling film multiefficacy evaporator |
| CN2154734Y (en) * | 1993-03-09 | 1994-02-02 | 何晓东 | 3-effect vacuum concentration evaporator |
| CN1837075A (en) * | 2006-04-09 | 2006-09-27 | 青岛大学 | Low-temperature multi-effect seawater desalination process |
| WO2008139647A1 (en) * | 2007-04-27 | 2008-11-20 | Saline Water Conversion Corporation | Desalination apparatus and method of desalination |
-
2009
- 2009-06-03 CN CN2009101464318A patent/CN101745240B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87200655U (en) * | 1987-01-20 | 1988-01-06 | 大连工学院 | Flexible conduit falling film multiefficacy evaporator |
| CN2154734Y (en) * | 1993-03-09 | 1994-02-02 | 何晓东 | 3-effect vacuum concentration evaporator |
| CN1837075A (en) * | 2006-04-09 | 2006-09-27 | 青岛大学 | Low-temperature multi-effect seawater desalination process |
| WO2008139647A1 (en) * | 2007-04-27 | 2008-11-20 | Saline Water Conversion Corporation | Desalination apparatus and method of desalination |
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| CN101745240A (en) | 2010-06-23 |
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