CN101648115A - Device and method for purifying vacuum membrane distillation steam - Google Patents
Device and method for purifying vacuum membrane distillation steam Download PDFInfo
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- CN101648115A CN101648115A CN200810054128A CN200810054128A CN101648115A CN 101648115 A CN101648115 A CN 101648115A CN 200810054128 A CN200810054128 A CN 200810054128A CN 200810054128 A CN200810054128 A CN 200810054128A CN 101648115 A CN101648115 A CN 101648115A
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Abstract
The invention discloses a device and a method for purifying vacuum membrane distillation steam. The device comprises a demisting device which is arranged in a steam channel of a membrane distillationdecompression system and a liquid collecting device which is positioned under the demisting device and connected with the steam channel of the membrane distillation decompression system. After demisting and liquid removing processes, the purity of the obtained steam condensing liquid can be greatly improved. The device and the method have the advantages of simple device, convenient operation, remarkable effect and the like.
Description
Technical field
The present invention relates to a kind of separator, specifically relate to a kind of vacuum membrane distillation steam purifier.
Background technology
(Membrane Distillation is a kind of new separation technology that grows up at the eighties of last century early eighties MD), is the new membrane separation process that membrane separation technique combines with traditional evaporation process in the film distillation.In the film still-process, unique effect of film is as two alternate barriers, does not participate in centrifugation directly, and separation selectivity is determined by vapor-liquid equilibrium fully.The film still-process is the process that heat and quality are transmitted simultaneously.According to the difference of volatile component at film downstream condensing mode, the film distillation can be divided into four kinds of different structures and mode of operation, that is: direct contact type film distillation (DCMD), GAP TYPE film distillation (AGMD), the distillation of sweeping type film (SGMD) and vacuum membrane distillation (VMD) (also claiming pressure reducing film distillation).Wherein since the pressure reducing film distillation process have that membrane flux is big, equipment is simple, easy to operate, enjoy people to pay close attention to, become the first-selection that realizes the film distillation technology industrialization.In actual application, it is to cause the product purity main reasons for decrease that the interior material liquid of membrane module leaks into the product side by various paths.Because pressure reducing film distillation has characteristics such as process driving force is big, the performance of the leakage phenomenon of feed liquid in this process is particularly outstanding.The present invention has invented the method that a kind of demist improves fresh water purity according to the characteristics of pressure reducing film distillation and the problem of existence.
Summary of the invention
The purpose of this invention is to provide a kind of vacuum membrane distillation steam purifier and method, preventing the pollution of material liquid in the pressure reducing film distillation process, improve fresh water purity, have equipment simple, be convenient to advantages such as operation, effect be remarkable.
The present invention is realized by following technical proposals, a kind of vacuum membrane distillation steam purifier and method, this device comprise demister that is installed in the film distillation depressurized system steam channel and the fluid collection device that is connected with film distillation depressurized system steam channel at the demister downside.
Described demister comprises the demister of various ways, and it is pressurized or enter in the steam channel of the film distillation depressurized system before the condensing unit that demister is installed on steam.Installing the demister purpose additional is that the droplet of carrying secretly in the steam is removed, to reach the purpose of purge vapor.
Described fluid collection device comprises atmospheric valve and leakage fluid dram and the valve that is provided with on liquid collecting container and the liquid collecting container.
Described liquid collecting container is connected by the steam channel of liquid conduits with film distillation depressurized system, and its position is at the downside of demister, and liquid conduits is provided with valve, helps the seepage hydrops in the film distillation decompression vapor system is removed.
Described liquid collecting container is with being provided with pressure-equalizing pipe between the membrane distillation steam passage, and pressure-equalizing pipe is provided with valve.Its objective is that the pressure that keeps interior pressure of liquid collecting container and film to distill the depressurized system liquid outlet is suitable, effusion can be discharged smoothly.
A kind of vacuum membrane distillation steam purification method, it is characterized in that carrying the purpose that droplet is removed secretly in realizing steam by in film distillation depressurized system steam channel, installing demister additional, by realizing the seepage hydrops is shifted out the purpose that film distills depressurized system with the fluid collection device that film distillation depressurized system steam channel is connected, finally realize the purpose of purge vapor and raising condensate liquid purity at the demister downside.
In the pressure reducing film distillation process, the steam that sees through film under the effect of negative pressure flows to low pressure from membrane module through demister, when the steam of carrying droplet secretly during by demister only steam can pass through demister, be retained down and be gathered into big drop and flow to the bottom of steam channel and carry wherein droplet secretly from demister, thus the liquid that gathers in the steam channel bottom then the liquid conduits by its bottom enter liquid collecting container and discharge film distillation depressurized system.For the liquid that makes the steam channel bottom can enter liquid collecting container smoothly, between steam channel and liquid collecting container, be connected to pressure-equalizing pipe, its purpose makes liquid collecting container keep identical or close pressure with steam channel.
In the time the liquid in the liquid collecting container need being discharged, the valve on closing liquid conduit and the pressure-equalizing pipe is opened the atmospheric valve on the liquid collecting container, after the emptying, opens the draining valve of its downside liquid is discharged liquid collecting container.After the discharge liquid, close draining valve and atmospheric valve, slowly open the valve on the pressure-equalizing pipe, and then slowly open the valve on the liquid conduits, continue collection and spill liquid.
After above-mentioned demist and removing liquid technology, the purity of the condensate liquid that is obtained in the steam condensation process of postorder can be improved largely.
Description of drawings
Fig. 1 is vacuum membrane distillation steam purifier structural representation A:1, membrane module, 2, heat exchanger, 3, the flow of vapor direction, 4, demister, 5, liquid collecting container, 6, liquid conduits, 7, pressure-equalizing pipe, 8, drain, 9, leakage fluid dram, 10-1,10-2,10-3,10-4, valve.
Fig. 2 is vacuum membrane distillation steam purifier structural representation B:3, flow of vapor direction, 4, demister, 5, liquid collecting container, 6, liquid conduits, 7, pressure-equalizing pipe, 8, drain, 9, leakage fluid dram, 10-1,10-2,10-3,10-4, valve, 11, hollow-fibre membrane, 12, membrane module shell, 13, membrane component end cover, 14, the vapor outlet port on the membrane component end cover.
The specific embodiment
As shown in Figure 1, in the pressure reducing film distillation system of membrane module (1) and the mutual series connection of heat exchanger (2), demister (4) is positioned between membrane module (1) and the heat exchanger (2), and fluid collection device is positioned at the downside of demister (4).In the pressure reducing film distillation process, under the effect of negative pressure when steam from membrane module (1) through demister (4) when flowing to heat exchanger (2), only steam can pass through demister (4), and be retained down by demister (4) and be gathered into big drop and flow to the bottom of steam channel from demister when being entrained in droplet in the steam, the liquid that gathers in the steam channel bottom then enters liquid collecting container (5) by connected liquid conduits (6) and discharges film and distill depressurized system.For the liquid that makes steam channel bottom can enter liquid collecting container (5) smoothly, between steam channel and liquid collecting container (5), be connected to pressure-equalizing pipe (7) so that the identical or close pressure of maintenance between liquid collecting container (5) and the steam channel.
In the time the liquid in the liquid collecting container (5) need being discharged, valve (10-1) on the closing liquid conduit (6) and the valve (10-2) on the pressure-equalizing pipe (7), open the atmospheric valve (10-3) on the liquid collecting container (5), after the emptying, open the tapping valve (10-4) of its downside liquid is discharged liquid collecting container (5).After the discharge liquid, close draining valve (10-4) and atmospheric valve (10-3), slowly open the valve (10-2) on the pressure-equalizing pipe, then, slowly open liquid conduits (10-1), continue collection and spill liquid.
After above-mentioned demist and removing liquid technology, can obtain the higher condensate liquid of purity after entering the steam condensation of heat exchanger.
Demister (4) is positioned between the vapor outlet port of the vapor outlet port (14) of membrane component end cover (13) and hollow-fibre membrane (11) in the vacuum membrane distillation steam purifier shown in Figure 2, and fluid collection device is positioned at the downside of membrane component end cover (13).Arrive the vapor outlet port (14) of membrane component end cover (13) after steam comes out from hollow-fibre membrane (11) through the purification of demister (4), the hydrops in the membrane component end cover (13) is discharged film distillation depressurized system by fluid collection device.
The pressure reducing film distillation desalinization
Membrane module: hollow fiber film assembly.
Implementation condition: the flow through doughnut outside of seawater, negative pressure is granted the doughnut inboard, and demister is positioned at membrane component end cover vapor outlet port place, and fluid collection device is positioned at demister downside end cap lower.
Main operating condition: the membrane module inlet temperature of seawater is 90 ℃, and membrane module vapor outlet port pressure is 0.05MPa.
Fresh water salt content: 0-10mg/L.
Comparative Examples 1
The pressure reducing film distillation desalinization
Membrane module: hollow fiber film assembly.
Implementation condition: the flow through doughnut outside of seawater, negative pressure is granted the doughnut inboard, and demister and fluid collection device are not installed in the pressure reducing film distillation system.
Main operating condition: the membrane module inlet temperature of seawater is 90 ℃, and membrane module vapor outlet port pressure is 0.05MPa.
Fresh water salt content: 40-100mg/L.
The desalination of solar energy pressure reducing film distillation bitter
Membrane module: rolled membrane module.
Implementation condition: in the bitter desalination processes, demister is positioned at membrane module vapor outlet port place, and fluid collection device is connected with the steam channel of demister downside.
Main operating condition: the membrane module inlet temperature of bitter is 80 ℃, and membrane module vapor outlet port pressure is 0.04MPa.
Fresh water salt content: 0-5mg/L.
Comparative Examples 2
The desalination of solar energy pressure reducing film distillation bitter
Membrane module: rolled membrane module.
Implementation condition: in the pressure reducing film distillation bitter desalination system demister and fluid collection device are not installed.
Main operating condition: the membrane module inlet temperature of bitter is 80 ℃, and membrane module vapor outlet port pressure is 0.04MPa.
Fresh water salt content: 50-120mg/L.
The pressure reducing film distillation organic high-salinity wastewater is handled
Membrane module: hollow fiber film assembly.
Implementation condition: the doughnut outside is granted in the waste water doughnut inboard of flowing through, negative pressure, and demister is between membrane module and heat exchanger, and fluid collection device connects and the demister downside.
Main operating condition: the membrane module inlet temperature of waste water is 70 ℃, and membrane module vapor outlet port pressure is 0.02MPa.
The fresh water salt content is 0-5mg/L, COD＜10mg/L.
Comparative Examples 3
The pressure reducing film distillation organic high-salinity wastewater is handled
Membrane module: hollow fiber film assembly.
Implementation condition: the doughnut outside is granted in the waste water doughnut inboard of flowing through, negative pressure, and demister and fluid collection device are not installed in the pressure reducing film distillation system.
Main operating condition: with embodiment 3.
The fresh water salt content is 300-530mg/L, COD＜208mg/L.
Claims (6)
1, a kind of vacuum membrane distillation steam purifier is characterized by, and comprises demister that is installed in the film distillation depressurized system steam channel and the fluid collection device that is connected with film distillation depressurized system steam channel at the demister downside.
2, according to the vacuum membrane distillation steam purifier of claim 1, it is characterized in that described demister comprises the demister of various ways, it is pressurized or enter in the steam channel of the film distillation depressurized system before the condensing unit that demister is installed on steam.
3,, it is characterized in that described fluid collection device comprises atmospheric valve and leakage fluid dram and the valve that is provided with on liquid collecting container and the liquid collecting container according to the vacuum membrane distillation steam purifier of claim 1.
4, according to the fluid collection device of claim 3, it is characterized in that described liquid collecting container is connected by the steam channel of liquid conduits with film distillation depressurized system, its position is at the downside of demister, and liquid conduits is provided with valve.
5, according to the fluid collection device of claim 3, it is characterized in that being provided with pressure-equalizing pipe between the steam channel of described liquid collecting container with film distillation depressurized system, pressure-equalizing pipe is provided with valve.
6, a kind of method of using vacuum membrane distillation steam purifier as claimed in claim 1, it is characterized in that carrying the purpose that droplet is removed secretly in realizing steam by in film distillation depressurized system steam channel, installing demister additional, by realizing the seepage hydrops is shifted out the purpose that film distills depressurized system with the fluid collection device that film distillation depressurized system steam channel is connected, finally realize the purpose of purge vapor and raising condensate liquid purity at the demister downside;
In the pressure reducing film distillation process, the steam that sees through film under the effect of negative pressure flows to low pressure from membrane module through demister, when the steam of carrying droplet secretly during by demister only steam can pass through demister, be retained down and be gathered into big drop and flow to the bottom of steam channel and carry wherein droplet secretly, discharge film distillation depressurized system thereby the liquid conduits of the liquid that gathers in the steam channel bottom by its bottom enters liquid collecting container from demister; For the liquid that makes steam channel bottom can enter liquid collecting container smoothly, between steam channel and liquid collecting container, be connected to pressure-equalizing pipe so that liquid collecting container and steam channel keep identical or close pressure;
In the time the liquid in the liquid collecting container need being discharged, the valve on closing liquid conduit and the pressure-equalizing pipe is opened the atmospheric valve on the liquid collecting container, after the emptying, opens the draining valve of its downside liquid is discharged liquid collecting container; After the discharge liquid, close draining valve and atmospheric valve, slowly open the valve on the pressure-equalizing pipe, and then slowly open the valve on the liquid conduits, continue collection and spill liquid;
After above-mentioned demist and removing liquid technology, the purity of the condensate liquid that is obtained in the steam condensation process of postorder can be improved largely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810054128A CN101648115A (en) | 2008-08-14 | 2008-08-14 | Device and method for purifying vacuum membrane distillation steam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810054128A CN101648115A (en) | 2008-08-14 | 2008-08-14 | Device and method for purifying vacuum membrane distillation steam |
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| CN101648115A true CN101648115A (en) | 2010-02-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113039008A (en) * | 2018-11-15 | 2021-06-25 | 阿卜杜拉国王科技大学 | System and method for simultaneous power generation and fresh water generation by membrane distillation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113039008A (en) * | 2018-11-15 | 2021-06-25 | 阿卜杜拉国王科技大学 | System and method for simultaneous power generation and fresh water generation by membrane distillation |
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Open date: 20100217 |