CN114367198A - Dish tubular vacuum multi-effect membrane distillation subassembly and system - Google Patents
Dish tubular vacuum multi-effect membrane distillation subassembly and system Download PDFInfo
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- CN114367198A CN114367198A CN202210106430.6A CN202210106430A CN114367198A CN 114367198 A CN114367198 A CN 114367198A CN 202210106430 A CN202210106430 A CN 202210106430A CN 114367198 A CN114367198 A CN 114367198A
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- 239000012528 membrane Substances 0.000 title claims abstract description 132
- 238000004821 distillation Methods 0.000 title claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000012141 concentrate Substances 0.000 claims abstract description 9
- 239000008213 purified water Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000005373 pervaporation Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000746 purification Methods 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 3
- 238000001223 reverse osmosis Methods 0.000 abstract description 14
- 230000004907 flux Effects 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 12
- 239000002351 wastewater Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012982 microporous membrane Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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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
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/364—Membrane distillation
-
- 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
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of membrane distillation, and particularly relates to a disc tube type vacuum multi-effect membrane distillation assembly and system. A disc tube type vacuum multi-effect membrane distillation assembly comprises a disc tube type component, wherein a membrane on a disc type membrane in the disc tube type component is a pervaporation membrane or a distillation membrane. The disc tube type component comprises a shell, an upper flange and a lower flange are respectively arranged at two ends of the shell, the upper flange and the lower flange are fixed through a central pull rod, a flow guide disc and a disc type membrane are arranged in the shell, and an inlet for a substance to be treated, an outlet for a concentrate and an outlet for purified water are arranged on the upper flange or the lower flange. The invention couples the disc-tube reverse osmosis component with the membrane distillation technology to construct a novel membrane distillation component, thereby solving the problems of low membrane distillation flux and membrane pollution in the past; the invention adopts a vacuum membrane distillation mode to improve certain flux and relieve the pollution of high-salinity wastewater to the membrane distillation membrane.
Description
Technical Field
The invention belongs to the technical field of membrane distillation, and particularly relates to a disc tube type vacuum multi-effect membrane distillation assembly and system.
Background
The membrane distillation technology is used as a novel water treatment technology for seawater desalination for the first time, and gradually shows wide application prospects in the field of industrial high-salt-content wastewater treatment in recent years. The technology relies on the steam pressure difference generated by the temperature difference for mass transfer, and because the steam pressure is less influenced by the salt concentration, the membrane distillation can concentrate the salt-containing wastewater to 20 percent. Compared with the pressure-driven membrane separation process such as reverse osmosis technology, the membrane distillation has low operation pressure, good water quality of produced water and light membrane pollution. In addition, the operating temperature of the membrane distillation is low, and low-grade heat energy, such as industrial waste heat, solar energy and the like, can be utilized. The current membrane distillation technology for realizing industrial application is mainly difficult to realize in low flux and inevitable membrane pollution during long-time operation. Therefore, the invention needs to be explored to invent a membrane module and a system which are suitable for membrane distillation and have high flux and pollution resistance, so as to promote the industrialization process of membrane distillation.
The disc tube type reverse osmosis technology shows great advantages in the field of treating high-concentration refractory organic wastewater, the width of a flow channel is increased by the aid of the convex point structures on the flow guide plate, inflow wastewater is in a turbulent flow state, the scaling tendency of the membrane surface is effectively reduced, membranes are stacked layer by layer, flux is improved, and the membranes can be replaced independently and are convenient to operate. Compared with the traditional reverse osmosis process, the disc tube type reverse osmosis not only remarkably improves the flux and the water recovery rate, but also greatly improves the tolerance degree to inorganic salts and organic matters, the technology is applied to the treatment of landfill leachate at the earliest, and can treat high-salt organic wastewater with COD up to 35000mg/L and salt content of 3-6%. However, the technology has harsh operating conditions, the operating pressure generally needs to be more than 90bar, the membrane shell needs to be capable of bearing 90-120bar, the membrane needs to adopt a special anti-pollution reverse osmosis membrane (mainly depending on an inlet), and pipelines, valves, pumps and the like in the whole system need to be high-pressure resistant and corrosion resistant, so that the system is special in material, complex in structure, and high in equipment investment cost and operating cost.
The membrane distillation is based on the heat method for desalting, the mass transfer and the heat transfer are carried out simultaneously, the system generally operates under the conditions of normal pressure, medium and low temperature (40-60 ℃), the membrane adopts a hydrophobic microporous membrane, and the equipment investment cost and the operation cost are low. But different from a disc-tube type reverse osmosis membrane component, disc-tube type membrane distillation needs to realize high-efficiency mass transfer of the membrane component and high-efficiency utilization of heat of a membrane system, and therefore the disc-tube type membrane distillation component is designed to overcome the following main difficulties: 1. the high-pressure resistant structure of the disc-tube type reverse osmosis component is changed into a normal-pressure structure, so that the turbulent flow state control of the disc-tube type membrane component under the normal-pressure condition is realized. 2. The evaporation mass transfer function in the disc tube type component is added, and the evaporation-condensation process of the waste water on the hot and cold sides of the membrane element is realized. 3. The heat exchange function of the disc-tube type membrane component and the system is increased, and the high-efficiency utilization of heat in the disc-tube type membrane distillation process is realized by adopting multiple-effect, self-heat exchange and other modes. 4. And the water inlet and outlet positions of the disc-tube type membrane component, the membrane element, the object to be treated, a purified water flow channel, a central pull rod and other units are reconstructed, so that the high-efficiency concentration of wastewater and the high-efficiency condensation of steam of the disc-tube type membrane distillation system are realized.
Disclosure of Invention
The invention provides a disc tube type vacuum multi-effect membrane distillation assembly and a system aiming at the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a disc tube type vacuum multi-effect membrane distillation assembly comprises a disc tube type component, wherein a membrane on a disc type membrane in the disc tube type component is a pervaporation membrane or a distillation membrane.
Further, the disc tube type component comprises a shell, an upper flange and a lower flange are respectively arranged at two ends of the shell, the upper flange and the lower flange are fixed through a central pull rod, a flow guide disc and a disc type diaphragm are arranged inside the shell, and an inlet for a substance to be treated, a concentrate outlet and a purified water outlet are formed in the upper flange or the lower flange.
And furthermore, the central pull rod is of a hollow structure, and a cavity of the central pull rod is used as a cooling channel for introducing a cooling medium to accelerate the condensation speed of steam.
Furthermore, the water purification outlet is arranged on the lower flange plate, and the upper flange plate is connected with a vacuumizing device through a pipeline and used for vacuumizing the water purification channel to enable the water purification channel to be in a negative pressure state, so that the circulation speed of steam is increased.
The multi-effect membrane distillation system comprises at least two membrane distillation assemblies which are connected in series step by step, and a concentrate outlet and a to-be-treated substance inlet of the adjacent membrane distillation assemblies are respectively connected in series, so that the multi-stage concentration of sewage is realized.
Furthermore, the central pull rods of the adjacent membrane distillation assemblies are connected in series, so that the cooling channels are communicated, and the flow direction of the cooling medium is opposite to that of the object to be treated.
Furthermore, an outlet at the tail end of the cooling channel is communicated with an inlet of the heater through a pipeline, and an outlet of the heater is communicated with an inlet of the object to be treated of the first-stage membrane distillation assembly through a pipeline.
Furthermore, the vacuum degree of the membrane distillation assembly is gradually increased along with the flow direction of the object to be treated.
Compared with the prior art, the invention has the following advantages:
1. the invention couples the disc-tube reverse osmosis component with the membrane distillation technology to construct a novel membrane distillation component, thereby solving the problems of low membrane distillation flux and membrane pollution in the past;
2. according to the invention, a vacuum membrane distillation form is adopted, so that a certain flux can be improved, the pollution of high-salinity wastewater to a membrane distillation membrane is relieved, meanwhile, a disc-tube type membrane distillation assembly can realize larger membrane area application on a smaller floor area, larger membrane flux is realized, the industrialization process of a membrane distillation technology is accelerated, and meanwhile, a membrane can be independently replaced when pollution occurs, so that the operation is more convenient;
3. the membrane distillation component is driven by heat, the existing disc tube type is driven by high pressure (90bar), except that the shell is required to be a pressure-bearing shell, the membrane used in the reverse osmosis technology is a special compact membrane, the existing disc tube type mainly depends on an inlet, the compact membrane based on the pressure-bearing shell and the inlet needs larger equipment cost, the shell can run under normal pressure without bearing larger pressure and can be prepared by common materials, meanwhile, the membrane is a common hydrophobic microporous membrane, the equipment cost can be reduced by 80-90%, in addition, the disc tube type reverse osmosis also needs continuous running of equipment such as a high-pressure pump and the like, the running cost is high, the invention adopts waste heat as a heat source of a membrane distillation system, and the running cost can be reduced by 70-80%;
4. the disc tube type membrane distillation assembly is established, membrane distillation flux can be further improved through multi-effect series connection, meanwhile, the middle pull rod is used as a heat exchange tube to realize self heat exchange of a membrane distillation system, waste heat utilization in the concentration process is fully realized, and energy consumption and cost are reduced while the performance is improved.
Drawings
FIG. 1 is a schematic diagram of the construction of a membrane distillation assembly according to the present invention;
FIG. 2 is a schematic diagram of the multi-effect membrane distillation system of the present invention;
in the figure, a shell-1, an upper flange-2, a lower flange-3, a central pull rod-4, a flow guide disc-5, a disc type membrane-6, a to-be-treated substance inlet-7, a concentrate outlet-8, a purified water outlet-9, a vacuumizing device-10 and a heater-11.
Detailed Description
In order to further illustrate the technical solution of the present invention, the present invention is further illustrated by the following examples.
As shown in fig. 1, a disc tube type vacuum multi-effect membrane distillation assembly comprises a disc tube type member, the disc tube type member comprises a housing 1, an upper flange 2 and a lower flange 3 are respectively arranged at two ends of the housing 1, the upper flange 2 and the lower flange 3 are fixed through a central pull rod 4, the central pull rod 4 is of a hollow structure, a cavity of the central pull rod 4 is used as a cooling channel for introducing a cooling medium and accelerating the condensation speed of steam, a flow guide disc 5 and a disc type membrane 6 are arranged inside the housing 1, the membrane on the disc type membrane 6 is a pervaporation membrane or a distillation membrane, an inlet 7 for a substance to be treated and an outlet 8 for a concentrate are arranged on the upper flange 2 or the lower flange 3, a purified water outlet 9 is arranged on the lower flange 3, a vacuum pumping device 10 is connected to the upper flange 2 through a pipeline, the water purification device is used for vacuumizing the water purification channel to enable the water purification channel to be in a negative pressure state, so that the circulation speed of steam is increased.
As shown in fig. 2, the multi-effect membrane distillation system comprises at least two membrane distillation modules which are connected in series step by step, wherein a concentrate outlet 8 and an inlet 7 of an object to be treated of the adjacent membrane distillation modules are respectively connected in series, so that multi-stage concentration of sewage is realized, central pull rods 4 of the adjacent membrane distillation modules are connected in series, so that communication of a cooling channel is realized, the flow direction of a cooling medium is opposite to that of the object to be treated, an outlet at the tail end of the cooling channel is communicated with an inlet of a heater 11 through a pipeline, an outlet of the heater 11 is communicated with the inlet 7 of the object to be treated of a first-stage membrane distillation module through a pipeline, and the vacuum degree of the membrane distillation modules is gradually increased along with the flow direction of the object to be treated.
Table 1. flux comparison of conventional membrane distillation modules with the membrane distillation modules of the present invention.
The above table shows that the flux of the membrane distillation assembly of the present invention can be increased by 55-105% compared with the flux of the conventional membrane distillation assembly.
Table 2. conventional membrane distillation modules compared to the membrane distillation modules of the present invention for membrane fouling rate.
The above table shows that the membrane pollution rate of the membrane distillation assembly can be reduced by 47-62% compared with that of the conventional membrane distillation assembly.
Table 3, membrane element/shell cost comparison of the disk and tube reverse osmosis module to the disk and tube membrane distillation module of the present invention.
| Membrane element | Membrane shell | |
| Dish tubular reverse osmosis subassembly | 1000 to 1800 Yuan/sq m | 700 to 1200 yuan (90bar) |
| Assembly of the invention | 200 to 500 yuan/square meter | 100-300 yuan |
As can be seen from the table above, compared with the traditional disc-tube reverse osmosis component, the membrane distillation component provided by the invention has the advantages that the cost can be reduced by 70-80%, and the cost of the membrane shell can be reduced by 75-85%.
While there have been shown and described what are at present considered to be the essential features and advantages of the invention, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A disc tube type vacuum multi-effect membrane distillation assembly comprises a disc tube type component, wherein a membrane on a disc type membrane (6) in the disc tube type component is a pervaporation membrane or a distillation membrane.
2. The disc tube vacuum multi-effect membrane distillation assembly according to claim 1, wherein: the disc tube type component comprises a shell (1), wherein an upper flange (2) and a lower flange (3) are respectively arranged at two ends of the shell (1), the upper flange (2) and the lower flange (3) are fixed through a central pull rod (4), a flow guide disc (5) and a disc type membrane (6) are arranged inside the shell (1), and an inlet (7) for an object to be treated, a concentrate outlet (8) and a purified water outlet (9) are arranged on the upper flange (2) or the lower flange (3).
3. The disc tube vacuum multi-effect membrane distillation assembly according to claim 2, wherein: the central pull rod (4) is of a hollow structure, and a cavity of the central pull rod (4) is used as a cooling channel for introducing a cooling medium to accelerate the condensation speed of steam.
4. A dish vacuum multi-effect membrane distillation assembly according to claim 3, wherein: the water purification outlet (9) is arranged on the lower flange plate (3), and the upper flange plate (2) is connected with a vacuumizing device (10) through a pipeline and used for vacuumizing the water purification channel, so that the water purification channel is in a negative pressure state, and the circulation speed of steam is accelerated.
5. A multi-effect membrane distillation system based on the membrane distillation assembly of claim 4, wherein: the membrane distillation device comprises at least two membrane distillation assemblies which are connected in series step by step, and a concentrate outlet (8) and a to-be-treated substance inlet (7) of the adjacent membrane distillation assemblies are respectively connected in series, so that the multi-stage concentration of sewage is realized.
6. The multi-effect membrane distillation system of claim 5, wherein: the central pull rods (4) of the adjacent membrane distillation assemblies are connected in series, so that the cooling channels are communicated, and the flow direction of the cooling medium is opposite to that of the object to be treated.
7. The multi-effect membrane distillation system of claim 6, wherein: the outlet at the tail end of the cooling channel is communicated with the inlet of a heater (11) through a pipeline, and the outlet of the heater (11) is communicated with the inlet (7) of the object to be treated of the first-stage membrane distillation assembly through a pipeline.
8. The multi-effect membrane distillation system of claim 5, wherein: the vacuum degree of the membrane distillation assembly is gradually increased along with the flow direction of the object to be treated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210106430.6A CN114367198B (en) | 2022-01-28 | 2022-01-28 | Dish tubular vacuum multiple-effect membrane distillation assembly and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210106430.6A CN114367198B (en) | 2022-01-28 | 2022-01-28 | Dish tubular vacuum multiple-effect membrane distillation assembly and system |
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| CN114367198A true CN114367198A (en) | 2022-04-19 |
| CN114367198B CN114367198B (en) | 2024-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118145850A (en) * | 2024-05-09 | 2024-06-07 | 金科环境股份有限公司 | Treatment device and treatment method for high-salt high-hardness wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118145850A (en) * | 2024-05-09 | 2024-06-07 | 金科环境股份有限公司 | Treatment device and treatment method for high-salt high-hardness wastewater |
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| CN114367198B (en) | 2024-04-12 |
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