CN114367198B - Dish tubular vacuum multiple-effect membrane distillation assembly and system - Google Patents
Dish tubular vacuum multiple-effect membrane distillation assembly and system Download PDFInfo
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- CN114367198B CN114367198B CN202210106430.6A CN202210106430A CN114367198B CN 114367198 B CN114367198 B CN 114367198B CN 202210106430 A CN202210106430 A CN 202210106430A CN 114367198 B CN114367198 B CN 114367198B
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- membrane distillation
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- tube type
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- 239000012528 membrane Substances 0.000 title claims abstract description 134
- 238000004821 distillation Methods 0.000 title claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000008213 purified water Substances 0.000 claims abstract description 10
- 239000012141 concentrate Substances 0.000 claims abstract description 9
- 238000005373 pervaporation Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000001223 reverse osmosis Methods 0.000 abstract description 15
- 238000005516 engineering process Methods 0.000 abstract description 13
- 230000004907 flux Effects 0.000 abstract description 12
- 239000002351 wastewater Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 7
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000000149 chemical water pollutant Substances 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
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 239000012982 microporous membrane Substances 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
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
Landscapes
- 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 a system. A disc-tube type vacuum multi-effect membrane distillation assembly comprises a disc-tube type member, wherein a membrane on a disc-type membrane in the disc-tube type member is a pervaporation membrane or a distillation membrane. The disc-tube type member comprises a shell, an upper flange plate and a lower flange plate are respectively arranged at two ends of the shell, the upper flange plate and the lower flange plate are fixed through a central pull rod, a flow guide disc and a disc type diaphragm are arranged in the shell, and an inlet for an object to be treated, a concentrate outlet and a purified water outlet are arranged on the upper flange plate or the lower flange plate. The invention couples the disc tube type reverse osmosis component and the membrane distillation technology to construct a novel membrane distillation component, thereby solving the problems of lower membrane distillation flux and membrane pollution in the past; the invention adopts a vacuum membrane distillation mode, can improve certain flux and relieve the pollution of high-salt 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 a system.
Background
The membrane distillation technology is used as an emerging water treatment technology and is applied to sea water desalination at the earliest, and has wide application prospect in the field of industrial high-salt wastewater treatment in recent years. The technology relies on the vapor pressure difference generated by the temperature difference to carry out mass transfer, and the membrane distillation can generally concentrate the salt-containing wastewater to 20 percent because the vapor pressure is less influenced by the salt concentration. Compared with the pressure-driven membrane separation technology such as reverse osmosis technology, the membrane distillation has the advantages of low operating pressure, good quality of produced water and light membrane pollution. In addition, the operation 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 problem of membrane pollution which is inevitably existed in the long-time operation process is mainly that the flux is lower in the current membrane distillation technology for realizing industrial application. Therefore, the invention needs to be explored to provide a membrane module and a system which are suitable for membrane distillation with high flux and pollution resistance, so as to promote the industrial process of membrane distillation.
The disc tube type reverse osmosis technology has the advantages that the disc tube type reverse osmosis technology shows great advantages in the field of treating high-concentration refractory organic wastewater, the salient point structure on the guide disc increases the width of the flow channel, meanwhile, inflow wastewater is in a turbulent flow state, the scaling tendency of membrane surfaces is effectively reduced, the membranes are stacked layer by layer, the flux is improved, and the membrane can be independently replaced, and the operation is convenient. Compared with the traditional reverse osmosis process, the disc tube type reverse osmosis process not only improves the aspects of flux and water recovery rate, but also improves the tolerance degree to inorganic salt and organic matters, and the technology is applied to the treatment of landfill leachate at the earliest, and can treat high-salt organic wastewater with COD of 35000mg/L and salt content of 3-6%. However, the technical operation condition is harsh, the operation pressure generally needs to reach more than 90bar, the membrane shell needs to bear 90-120bar, the membrane needs to adopt a special anti-pollution reverse osmosis membrane (mainly relying on import), and pipelines, valves, pumps and the like in the whole system need to be high-pressure resistant and corrosion resistant, so that the system has special materials, complex structure and higher equipment investment cost and operation cost.
The membrane distillation is a desalting process based on a thermal method, mass transfer and heat transfer are carried out simultaneously, the system is generally operated under normal pressure and medium-low temperature conditions (40-60 ℃), the membrane adopts a hydrophobic microporous membrane, and the equipment investment cost and the operation cost are low. However, unlike a dished tubular reverse osmosis membrane module, dished tubular membrane distillation needs to achieve efficient mass transfer of the membrane module and efficient utilization of heat of a membrane system, and for this purpose, the dished tubular membrane distillation module 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 turbulent flow state control of the disc-tube type membrane component is realized under the normal pressure condition. 2. The evaporation mass transfer function in the disc-tube type component is added, and the evaporation-condensation process of the wastewater on the hot side and the cold side 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 efficient 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 reconstructing the water inlet and outlet positions of the disc tube type membrane assembly, the membrane element, the object to be treated, the purified water flow channel, the central pull rod and other units, so as to realize the efficient concentration of wastewater and the efficient condensation of steam of the disc tube type membrane distillation system.
Disclosure of Invention
The invention provides a disc tube type vacuum multi-effect membrane distillation assembly and a system aiming at the problems.
The invention adopts the following technical scheme to achieve the aim:
a disc-tube type vacuum multi-effect membrane distillation assembly comprises a disc-tube type member, wherein a membrane on a disc-type membrane in the disc-tube type member is a pervaporation membrane or a distillation membrane.
Further, the disc-tube type member comprises a shell, an upper flange plate and a lower flange plate are respectively arranged at two ends of the shell, the upper flange plate and the lower flange plate are fixed through a central pull rod, a flow guide disc and a disc type membrane are arranged in the shell, and an object to be treated inlet, a concentrate outlet and a purified water outlet are arranged on the upper flange plate or the lower flange plate.
Still further, the center pull rod is hollow structure, the cavity of center pull rod is as cooling channel for let in cooling medium, accelerate the condensation rate of steam.
Still further, the clean water outlet is arranged on the lower flange plate, and the upper flange plate is connected with a vacuumizing device through a pipeline and is used for vacuumizing the clean water channel, so that the clean water channel is in a negative pressure state, and the circulation speed of steam is accelerated.
The multi-effect membrane distillation system comprises at least two membrane distillation assemblies which are serially connected in series, and a concentrate outlet and a to-be-treated object inlet of each adjacent membrane distillation assembly are serially connected with each other, so that multistage concentration of sewage is realized.
Furthermore, the central pull rods of the adjacent membrane distillation assemblies are connected in series, so that the communication of the cooling channels is realized, and the flow direction of the cooling medium is opposite to the flow direction of the object to be treated.
Still further, the outlet at the tail end of the cooling channel is communicated with the inlet of the heater through a pipeline, and the outlet of the heater is communicated with the inlet of the to-be-treated matter of the first-stage membrane distillation assembly through a pipeline.
Further, 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 type reverse osmosis component and the membrane distillation technology to construct a novel membrane distillation component, thereby solving the problems of lower membrane distillation flux and membrane pollution in the past;
2. the invention adopts a vacuum membrane distillation mode to improve certain flux, relieves the pollution of high-salt wastewater to the membrane distillation membrane, simultaneously realizes larger membrane area application on smaller occupied area by the disc-tube membrane distillation assembly, realizes larger membrane flux, accelerates the industrial process of the membrane distillation technology, can independently replace the membrane when pollution occurs, and is more convenient to operate;
3. the membrane distillation component is driven by heat, the existing disc tube type membrane is driven by high pressure (90 bar), besides the shell is needed to be a pressure-bearing shell, the membrane used by the reverse osmosis technology is a special compact membrane, the membrane mainly depends on import, and the membrane can be operated under normal pressure without bearing high equipment cost based on the pressure-bearing shell and the imported compact membrane, and can be prepared by adopting common materials, meanwhile, the membrane of the membrane distillation component adopts common hydrophobic microporous membranes, the equipment cost can be reduced by 80-90%, in addition, the disc tube type reverse osmosis also needs continuous operation of equipment such as a high-pressure pump, and the operation cost is high, and the operation cost can be reduced by 70-80% by adopting waste heat as a heat source of the membrane distillation system;
4. the disc tube type membrane distillation assembly is established, the membrane distillation flux can be further improved through multiple-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 a concentration process is fully realized, and energy consumption and cost are reduced while performance is improved.
Drawings
FIG. 1 is a schematic diagram of a membrane distillation module according to the present invention;
FIG. 2 is a schematic diagram of a multi-effect membrane distillation system according to the present invention;
in the figure, a shell-1, an upper flange-2, a lower flange-3, a central pull rod-4, a deflector disc-5, a disc-type diaphragm-6, an object to be treated-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 scheme of the invention, the 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, wherein the disc-tube type member comprises a shell 1, an upper flange plate 2 and a lower flange plate 3 are respectively arranged at two ends of the shell 1, the upper flange plate 2 and the lower flange plate 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 cooling medium to accelerate the condensation speed of steam, a flow guiding disc 5 and a disc type membrane 6 are arranged in the shell 1, a membrane on the disc type membrane 6 is a pervaporation membrane or a distillation membrane, an object inlet 7 to be treated and a concentrate outlet 8 are arranged on the upper flange plate 2 or the lower flange plate 3, a purified water outlet 9 is arranged on the lower flange plate 3, and a vacuumizing device 10 is connected to the upper flange plate 2 through a pipeline and used for vacuumizing a purified water channel, so that the purified water channel is in a negative pressure state, and the circulation speed of the steam is accelerated.
As shown in fig. 2, the multi-effect membrane distillation system comprises at least two membrane distillation assemblies which are serially connected step by step, wherein a concentrate outlet 8 and a to-be-treated object inlet 7 of each adjacent membrane distillation assembly are serially connected with each other respectively, so that multistage concentration of sewage is realized, a center pull rod 4 of each adjacent membrane distillation assembly is serially connected with each other, so that communication of a cooling channel is realized, the flow direction of a cooling medium is opposite to the flow direction of the to-be-treated object, 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 to-be-treated object inlet 7 of the first-stage membrane distillation assembly through a pipeline, and the vacuum degree of the membrane distillation assembly is gradually increased along with the flow direction of the to-be-treated object.
Table 1. Flux comparison of conventional membrane distillation modules with the membrane distillation modules of the present invention.
As shown in the table above, compared with the traditional membrane distillation assembly, the flux of the membrane distillation assembly can be improved by 55-105%.
Table 2. Membrane fouling rates of conventional membrane distillation modules are compared to those of the membrane distillation modules of the present invention.
As shown in the table above, the membrane pollution rate of the membrane distillation assembly adopting the invention can be reduced by 47-62% compared with that of the traditional membrane distillation assembly.
Table 3. Cost comparison of the disc tubular reverse osmosis module and the membrane element/membrane shell of the disc tubular membrane distillation module of the present invention.
| Membrane element | Membrane shell | |
| Disc tube type reverse osmosis assembly | 1000-1800 yuan/square meter | 700-1200 yuan (90 bar) |
| The inventive assembly | 200-500 yuan/square meter | 100-300 yuan |
As shown in the table above, compared with the traditional disc-tube type reverse osmosis component, the membrane distillation component has the advantages that the cost of the membrane component can be reduced by 70-80%, and the cost of the membrane shell can be reduced by 75-85%.
While the principal features and advantages of the present invention have been shown and described, 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 that the invention may be embodied in 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. The utility model provides a dish tubular vacuum multiple-effect membrane distillation subassembly, includes dish tubular component, its characterized in that: the disc-tube type component comprises a shell (1), wherein an upper flange plate (2) and a lower flange plate (3) are respectively arranged at two ends of the shell (1), the upper flange plate (2) and the lower flange plate (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 and is used for introducing cooling medium to accelerate the condensing speed of steam, a flow guiding disc (5) and a disc type membrane (6) are arranged in the shell (1), an object inlet (7) to be treated, a concentrate outlet (8) and a purified water outlet (9) are arranged on the upper flange plate (2) or the lower flange plate (3), and a vacuumizing device (10) is connected to the upper flange plate (2) through a pipeline and is used for vacuumizing the purified water channel to enable the purified water channel to be in a negative pressure state so as to accelerate the circulating speed of the steam;
the membrane on the disc-type membrane sheet (6) in the disc-type member is a pervaporation membrane or a distillation membrane.
2. The multiple-effect membrane distillation system based on the membrane distillation assembly of claim 1, wherein: the sewage treatment device comprises at least two membrane distillation assemblies which are serially connected, wherein a concentrate outlet (8) and a to-be-treated object inlet (7) of each adjacent membrane distillation assembly are serially connected with each other respectively, so that multistage concentration of sewage is realized, center pull rods (4) of the adjacent membrane distillation assemblies are serially connected with each other, the communication of cooling channels is realized, and the flow direction of a cooling medium is opposite to the flow direction of the to-be-treated object.
3. The multi-effect membrane distillation system according to claim 2, wherein: the outlet of the tail end of the cooling channel is communicated with the inlet of the heater (11) through a pipeline, and the outlet of the heater (11) is communicated with the to-be-treated matter inlet (7) of the first-stage membrane distillation assembly through a pipeline.
4. A multi-effect membrane distillation system according to claim 3, wherein: the vacuum degree of the membrane distillation assembly gradually increases along with the flow direction of the object to be treated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| 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 CN114367198A (en) | 2022-04-19 |
| CN114367198B true CN114367198B (en) | 2024-04-12 |
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| CN118145850B (en) * | 2024-05-09 | 2024-07-02 | 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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