CN113546520A - Air gap type membrane distillation cooling assembly with multiple cooling sources for cooling - Google Patents
Air gap type membrane distillation cooling assembly with multiple cooling sources for cooling Download PDFInfo
- Publication number
- CN113546520A CN113546520A CN202110878639.XA CN202110878639A CN113546520A CN 113546520 A CN113546520 A CN 113546520A CN 202110878639 A CN202110878639 A CN 202110878639A CN 113546520 A CN113546520 A CN 113546520A
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- Prior art keywords
- air gap
- cold
- cold fluid
- cooling
- membrane distillation
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- 239000012528 membrane Substances 0.000 title claims abstract description 69
- 238000001816 cooling Methods 0.000 title claims abstract description 37
- 238000004821 distillation Methods 0.000 title claims abstract description 32
- 239000012530 fluid Substances 0.000 claims abstract description 62
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 19
- 239000010949 copper Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000012153 distilled water Substances 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 7
- 230000004907 flux Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/366—Apparatus therefor
-
- 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
- B01D61/368—Accessories; Auxiliary operations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses an air gap type membrane distillation cooling assembly cooled by multiple cold sources, which comprises a porous hydrophobic membrane and a cold fluid pipeline, wherein a hot fluid area is arranged on the upper side of the porous hydrophobic membrane, a hot fluid outlet is arranged on the right side of the hot fluid area, an air gap is arranged on the lower side of the porous hydrophobic membrane, the cold fluid pipeline is arranged in the air gap, a copper plate is arranged below the cold fluid pipeline, a distilled water outlet is arranged on the front side of the air gap, and a cold fluid outlet is arranged above the distilled water outlet. According to the invention, the annular fins are arranged on the cold fluid pipeline, so that the heat exchange efficiency of the cold fluid is enhanced, and the overall efficiency of air gap membrane distillation is improved. The copper plate with the fins is arranged at the bottom of the air gap, and the air cooling is utilized to dissipate heat of the copper plate, so that the condensation of water vapor is promoted, and the overall efficiency of air gap membrane distillation is improved.
Description
Technical Field
The invention belongs to the technical field of distillation devices, and particularly relates to an air gap type membrane distillation cooling assembly cooled by multiple cold sources.
Background
Membrane distillation is a novel separation technology combining a thermodynamic process (distillation) and a membrane separation process, and is widely applied to desalination, desalination and concentration processes of seawater, brackish water, industrial wastewater and the like. The air gap type membrane distillation has the advantages of high thermal efficiency, strong technical adaptability and the like, but has the problem of low membrane flux. The air gap type membrane distillation air gap layer can obviously reduce heat loss caused by heat conduction, weaken temperature polarization effect and improve the heat efficiency in the membrane distillation process, and meanwhile, the form of the membrane component becomes diversified, the technical adaptability is strong, the limitation is few, the operation is flexible and simple, and meanwhile, the membrane component is widely applied to different fields.
Disclosure of Invention
The invention aims to provide a multi-cold-source cooling air gap type membrane distillation cooling assembly which is less in limitation, flexible and simple to operate and capable of improving the overall efficiency of a membrane distillation process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a many cold sources refrigerated air gap formula membrane distillation cooling module, includes porous hydrophobic membrane and cold fluid pipeline, the upside of porous hydrophobic membrane is equipped with the heat flow district, the right side in heat flow district is equipped with the hot-fluid outlet, the left side in heat flow district is equipped with the hot-fluid import, the downside of porous hydrophobic membrane is equipped with the air gap, be equipped with the cold fluid pipeline in the air gap, the copper is installed to the below in cold fluid pipeline, the front side in air gap is equipped with the distilled water export, the top in distilled water export is equipped with the cold fluid export, the left side in heat flow district is equipped with the hot-fluid import.
According to the above feature, the left side of the cold fluid pipe is provided with a cold fluid inlet.
In some examples, the cold fluid conduit surface is provided with annular fins.
According to the above feature, the copper plate is provided with cylindrical fins on both side surfaces, and the air cooling device includes a fan and a bracket.
In some examples, the porous hydrophobic membrane has a pore size of 200nm to 400 nm.
The invention has the beneficial effects that:
1) the invention improves the overall efficiency of membrane distillation by designing the air gap type membrane distillation cooling assembly. The membrane distillation cold side is cooled by combining two cold sources of water cooling and air cooling, and a cold fluid pipeline is arranged in an air gap, so that the mass transfer process is facilitated, the condensation effect of a cold fluid can be enhanced, and the flux loss is reduced.
2) According to the invention, the annular fins are arranged on the cold fluid pipeline, so that the heat exchange efficiency of the cold fluid is enhanced, and the overall efficiency of air gap membrane distillation is improved.
3) The copper plate with the fins is arranged at the bottom of the air gap, and the air cooling is utilized to dissipate heat of the copper plate, so that the condensation of water vapor is promoted, and the overall efficiency of air gap membrane distillation is improved.
Drawings
FIG. 1 is a schematic structural diagram of an air-gap membrane distillation cooling module with multiple cooling sources for cooling according to the present invention.
FIG. 2 is a schematic cross-sectional view taken along the direction a in FIG. 1 according to the present invention.
FIG. 3 is a schematic cross-sectional view taken along the direction b in FIG. 1 according to the present invention.
FIG. 4 is a graph showing the effect of effective length on module performance for membrane modules of the present invention.
FIG. 5 is a graph showing the effect of membrane pore size on module performance in accordance with the present invention.
Shown in the figure: 1-hot fluid inlet; 2-a hot fluid outlet; 3-a hot-flow zone; 4-porous hydrophobic membranes; 5-cold fluid inlet; 6-cold fluid outlet; 7-cold fluid piping; 8-air gap; 9-a distilled water outlet; 10-copper plate; 11-air cooling device.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While embodiments of the invention are illustrated in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Those skilled in the art will recognize that alternative embodiments may be made from the following description without departing from the spirit and scope of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It is an object of the present invention to provide a multi-heat-source cooled air-gap membrane distillation cooling assembly that overcomes the above-mentioned problems of the prior art and has the following advantages in conjunction with the following description.
A multi-cold source cooled air-gap membrane distillation cooling assembly according to a first embodiment of the present invention will be described with reference to fig. 1.
Fig. 1 shows a schematic structure diagram of a multi-cold-source cooled air gap type membrane distillation cooling assembly according to the invention.
According to the first embodiment of the invention, the multi-cold-source cooled air gap type membrane distillation cooling assembly comprises a porous hydrophobic membrane 4 and a cold fluid pipeline 7, wherein a hot fluid area 3 is arranged on the upper side of the porous hydrophobic membrane 4, a hot fluid outlet 2 is arranged on the right side of the hot fluid area 3, an air gap 8 is arranged on the lower side of the porous hydrophobic membrane 4, the cold fluid pipeline 7 is arranged in the air gap 8, a copper plate 10 is arranged below the cold fluid pipeline 7, a distilled water outlet 9 is arranged on the front side of the air gap 8, and a cold fluid outlet 6 is arranged above the distilled water outlet 9.
According to the characteristics, the cold fluid inlet 5 is arranged on the left side of the cold fluid pipeline 7, and the hot fluid inlet 1 is arranged on the left side of the hot fluid zone 3.
In some examples, the cold fluid conduit 7 is provided with annular fins on its surface. According to the above feature, the copper plate 10 is provided with cylindrical fins on both side surfaces, and the air-cooling device 11 includes a fan and a bracket.
In some examples, the porous hydrophobic membrane 4 has a pore size of 200nm to 400 nm.
As shown in fig. 1-3, the present invention is sequentially divided into a hot-flow area 3, a porous hydrophobic membrane 4, an air gap 8, a copper plate 10 and an air cooling device 11 from top to bottom, wherein the hot-flow area 3 is located on the upper side of the porous hydrophobic membrane 4 and comprises a hot-fluid inlet 1 and a hot-fluid outlet 2; the aperture of the porous hydrophobic membrane 4 is 200 nm-400 nm; the air gap 8 is arranged at the lower side of the porous hydrophobic membrane 4 and comprises a cold fluid inlet 5, a cold fluid outlet 6, a cold fluid pipeline 7 and a distilled water outlet 9, and the cold fluid pipeline 7 is arranged in the air gap 8, so that the mass transfer process is facilitated, the condensation effect of the cold fluid can be enhanced, and the flux loss is reduced; the surface of the cold fluid pipeline 7 is provided with annular fins, so that the heat exchange efficiency of the cold fluid is enhanced, and the overall efficiency of air gap membrane distillation is improved; cylindrical fins are arranged on the surfaces of the two sides of the copper plate 10, so that the heat exchange efficiency of the copper plate can be improved; the air cooling device 11 comprises a fan and a support, and is mainly used for carrying out air cooling heat dissipation on the copper sheet, promoting condensation of water vapor and improving the overall efficiency of air gap membrane distillation.
In the invention, the cold fluid pipe 7 is arranged in the air gap 8, and an annular fin is added on the cold fluid pipe 7. In the invention, the copper plate 10 is arranged at the bottom of the air gap 8, the cylindrical fins are arranged on two sides of the copper plate 10, and the copper plate 10 is air-cooled by the air cooling device 11. In the present invention, the porous hydrophobic membrane 11 is a porous polytetrafluoroethylene hydrophobic membrane or a porous polyvinylidene chloride hydrophobic membrane.
The effect of the effective length of the membrane module on the performance of the module in the present invention is shown in FIG. 4:
the PVDF membranes used in modules M1, M2 and M3 all had an average pore diameter of 0.33. mu.m, and effective lengths of 0.4M, 0.5M and 0.6M, respectively, as can be seen from FIG. 4, as the effective length of the module increases, the molar flux J increasesDThe decrease results in an increase in GOR because the increase in the effective length of the module results in a larger effective membrane area and a permeate volume flow qv,DThe longer the cold liquid stays in the module, the longer the effective length of the module is, and the average temperature (t) of the inlet and outlet of the cold liquid1+t2) Increase in temperature and average temperature of hot feed liquid inlet and outlet (t)3+t4) The/2 is reduced, the average temperature difference of the cold side and the hot side is reduced, the direct driving force of transmembrane steam is reduced, and the membrane flux of the module is reduced.
The effect of membrane pore size on the performance of the assembly of the present invention is shown in figure 5:
the effective lengths of modules M3, M4 and M5 were all 0.55M, the average pore diameters of the flat membranes used were 0.33. mu.m, 0.25. mu.m and 0.19. mu.m, respectively, and as can be seen from FIG. 5, the membrane flux JDAnd the water production ratio GOR increases with the increase of the membrane pore size, and when the membrane pore size is increased from 0.19 μm to 0.33 μm, the corresponding membrane flux JDFrom 6.78 kg/(m)2H) to 8.59 kg/(m)2H), the water make ratio GOR increases from 1.33 to 2.11.
The volume flow q of penetrating fluid at different hot feed liquid feeding temperaturesv,DAnd temperature difference (t)3-t2) As shown in table 1:
as can be seen from Table 1, with hot feed temperature t3Increasing the volumetric flow q of the permeatev,DAnd temperature difference (t)3-t2) All increase but the volume flow q of the penetrating fluidv,DIs greater than (t)3-t2) And thus the water production ratio of the assembly is increased.
The above description is only for the specific embodiments of the present disclosure, but the scope of the embodiments of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes, substitutions or combinations within the technical scope of the embodiments of the present disclosure or under the concept of the embodiments of the present disclosure, and all of them should be covered by the scope of the embodiments of the present disclosure.
Claims (5)
1. The utility model provides a many cold sources refrigerated air gap formula membrane distillation cooling module, includes porous hydrophobic membrane (4) and cold fluid pipeline (7), its characterized in that the upside of porous hydrophobic membrane (4) is equipped with hot-flow region (3), the right side of hot-flow region (3) is equipped with hot-fluid outlet (2), the left side of hot-flow region (3) is equipped with hot-fluid import (1), the downside of porous hydrophobic membrane (4) is equipped with air gap (8), be equipped with cold fluid pipeline (7) in air gap (8), copper (10) are installed to the below of cold fluid pipeline (7), the front side of air gap (8) is equipped with distilled water export (9), the top of distilled water export (9) is equipped with cold fluid outlet (6).
2. The air gap type membrane distillation cooling assembly with multiple cold sources for cooling as claimed in claim 1, wherein the left side of the cold fluid pipeline (7) is provided with a cold fluid inlet (5).
3. A multi-cold-source cooled air-gap type membrane distillation cooling assembly as claimed in claim 1, wherein the surface of the cold fluid pipe (7) is provided with annular fins.
4. A multi-cold-source cooled air-gap type membrane distillation cooling assembly as claimed in claim 1, wherein the copper plate (10) is provided with cylindrical fins on both side surfaces, and the air cooling device (11) comprises a fan and a bracket.
5. The multi-cold-source cooled air gap type membrane distillation cooling assembly as claimed in claim 1, wherein the pore diameter of the porous hydrophobic membrane (4) is 200 nm-400 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110878639.XA CN113546520A (en) | 2021-08-02 | 2021-08-02 | Air gap type membrane distillation cooling assembly with multiple cooling sources for cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110878639.XA CN113546520A (en) | 2021-08-02 | 2021-08-02 | Air gap type membrane distillation cooling assembly with multiple cooling sources for cooling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113546520A true CN113546520A (en) | 2021-10-26 |
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| CN202110878639.XA Pending CN113546520A (en) | 2021-08-02 | 2021-08-02 | Air gap type membrane distillation cooling assembly with multiple cooling sources for cooling |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150014144A1 (en) * | 2012-01-11 | 2015-01-15 | Aaa Water Technologies Ag | Cooling device |
| CN210964665U (en) * | 2019-09-11 | 2020-07-10 | 华北电力大学 | Novel air gap type membrane distillation structure for strengthening condensation |
| CN112695836A (en) * | 2020-12-15 | 2021-04-23 | 内蒙古工业大学 | Solar energy intelligence outdoor device of washing hand based on membrane distillation |
-
2021
- 2021-08-02 CN CN202110878639.XA patent/CN113546520A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150014144A1 (en) * | 2012-01-11 | 2015-01-15 | Aaa Water Technologies Ag | Cooling device |
| CN210964665U (en) * | 2019-09-11 | 2020-07-10 | 华北电力大学 | Novel air gap type membrane distillation structure for strengthening condensation |
| CN112695836A (en) * | 2020-12-15 | 2021-04-23 | 内蒙古工业大学 | Solar energy intelligence outdoor device of washing hand based on membrane distillation |
Non-Patent Citations (1)
| Title |
|---|
| 马韬等: "带有冷凝微结构的间歇式膜蒸馏组件传热传质过程机理研究", 《中国电力》 * |
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Application publication date: 20211026 |