CN210964665U - Novel air gap type membrane distillation structure for strengthening condensation - Google Patents
Novel air gap type membrane distillation structure for strengthening condensation Download PDFInfo
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- CN210964665U CN210964665U CN201921509017.4U CN201921509017U CN210964665U CN 210964665 U CN210964665 U CN 210964665U CN 201921509017 U CN201921509017 U CN 201921509017U CN 210964665 U CN210964665 U CN 210964665U
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Abstract
The utility model relates to a heat transfer technical field provides a reinforce novel air gap formula membrane distillation structure of condensation, include: the high-temperature feed liquid channel is divided by a first partition plate (1) and a distillation membrane (3); a heat exchange zone which is divided by the distillation membrane (3) and the cooling plate (9); the low-temperature feed liquid channel is divided by a cooling plate (9) and a second partition plate (10); and the heat conduction structure is positioned in the heat exchange area, an air gap is reserved between the heat conduction structure and the distillation membrane (3), and water is filled between the heat conduction structure and the distillation membrane (3). The utility model discloses combine the distilled advantage of direct contact membrane distillation and air gap formula membrane for under the prerequisite that does not influence membrane distillation efficiency, utilize the heat heating low temperature feed liquid of high temperature feed liquid, and then realize thermal effective recycle.
Description
Technical Field
The utility model relates to a heat transfer device, more specifically relates to a reinforce novel air gap formula membrane distillation structure of condensation.
Background
The membrane distillation is a novel membrane separation technology combining membrane separation and evaporation processes, the vapor saturation pressure difference of two sides of a hydrophobic microporous membrane is used as a driving force, feed liquid is vaporized on the surface of the membrane, and steam permeates the microporous membrane and is condensed to realize the separation process of solute and solvent. In the membrane distillation process, the vapor mass transfer condensation process in the conventional distillation and the membrane separation process of separating substances diffusing and permeating the membrane are adopted. It avoids the defects of easy scaling and corrosion resistance of the distillation method and the need of high-pressure operation of the reverse osmosis method. Theories and practices prove that the membrane distillation technology has the following advantages: (1) theoretically, membrane distillation can achieve 100% salt rejection. The selectivity to non-volatile substances such as macromolecular compounds, colloids, salts and the like is 0, so that the product of membrane distillation is high-purity water. The selectivity of membrane distillation to water is higher than that of reverse osmosis desalination process, even higher than that of multi-stage flash evaporation. (2) The influence of salt concentration on the efficiency of membrane distillation is much lower than that of reverse osmosis and distillation, and the vaporization process of water in the membrane distillation process requires a large amount of low-grade heat
The prior common membrane distillation modes comprise air gap type membrane distillation, direct contact type membrane distillation, vacuum type membrane distillation and air sweeping type membrane distillation, wherein the direct contact type membrane distillation is that one side of a membrane is in direct contact with a hot material liquid, and the other side of the membrane is in direct contact with a cold fluid.
Direct contact membrane distillation is the simplest, but the vapor that permeates the distillation membrane mixes directly with the permeate side coolant, and cannot take advantage of the latent heat of vaporization released by its condensation. The air gap type membrane distillation can realize the utilization of latent heat, but the air gap of the membrane distillation forms the main resistance of the mass transfer process, so that the transmembrane temperature difference is far smaller than the temperature difference of the fluid main bodies on two sides of the membrane.
SUMMERY OF THE UTILITY MODEL
To the problem in the background art, the utility model provides a novel distillation membrane micro-structure, include: the high-temperature feed liquid channel is divided by a first partition plate and a distillation membrane; the heat exchange area is divided by a distillation film and a cooling plate; the low-temperature feed liquid channel is divided by a cooling plate and a second partition plate; and the heat conduction structure is positioned in the heat exchange area, an air gap is reserved between the heat conduction structure and the distillation membrane, and water is filled between the heat conduction structure and the distillation membrane.
Optionally, the novel condensation-enhanced air gap membrane distillation structure further comprises: the heater is connected between the high-temperature material liquid channel and the low-temperature material liquid channel, wherein the low-temperature material liquid in the low-temperature material liquid channel flows into the high-temperature material liquid channel after being heated by the heater.
Optionally, a layer of water flows through the thermally conductive structure.
Optionally, the heat conducting structure is a cooling fin, and one side of the cooling fin contacts the cooling plate.
Optionally, the cooling fin is a microstructure with a microtube inside for flowing a cooling fluid.
Optionally, the cooling fin is a helical structure.
Optionally, a protrusion is disposed on the cooling fin.
The utility model has the advantages that: the advantages of direct contact type membrane distillation and air gap type membrane distillation are combined, so that on the premise of not influencing the membrane distillation efficiency, the heat of the high-temperature feed liquid is utilized to heat the low-temperature feed liquid, and further the effective recycling of the heat is realized. The design of heat conduction structure makes the heat efficient transmission in the high temperature feed liquid to the low temperature feed liquid for heat exchange efficiency is higher, and the heater energy consumption is littleer, and membrane distillation's efficiency and water making are than higher.
Drawings
In order that the invention may be more readily understood, it will be described in more detail with reference to specific embodiments thereof that are illustrated in the accompanying drawings. These drawings depict only typical embodiments of the invention and are not therefore to be considered to limit the scope of the invention.
Fig. 1 is a front view of an embodiment of a distillation membrane structure according to the present invention.
Fig. 2 is a top view of an embodiment of a distillation membrane structure according to the present invention.
Fig. 3 is a schematic structural view of the cooling fin of the tumor membrane structure of the present invention.
Reference numerals
1-a first separator; 2-feed liquid; 3-distillation of the membrane; 4-aqueous layer; 5-cooling fins; 6-producing water; 7-low temperature feed liquid; 8-a heater; 9-a cooling plate; 10-second separator.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like parts are designated by like reference numerals. The embodiments described below and the technical features of the embodiments may be combined with each other without conflict.
The utility model relates to a novel membrane distillation structure, which is the combination of direct contact type membrane distillation and air gap type membrane distillation. So that the method has the advantages of direct contact type membrane distillation and air gap type membrane distillation. Namely, the feed liquid at the cold side can be preheated, so that the heat is effectively utilized.
Fig. 1 shows an embodiment of the novel condensation enhanced air gap membrane distillation structure of the present invention. The novel air gap type membrane distillation structure for strengthening condensation comprises 3 zones: the left side is a high-temperature feed liquid channel separated by a first partition plate 1 and a distillation membrane 3, feed liquid 2 flows through the channel, and the feed liquid 2 belongs to high-temperature feed liquid. The middle part is a heat exchange area formed by separating the distillation membrane 3 and the cooling plate 9, and the middle part of the heat exchange area is provided with a cooling fin 5. The cooling fins 5 contact the cooling plates 9 but are spaced from the distillation membranes 3 by an air gap, and the space between the heat conducting structure and the distillation membranes 3 is filled with water. The water 6 produced in the heat transfer zone flows out from below. The right side is a low-temperature material liquid channel separated by a cooling plate 9 and a second partition plate 10, and the low-temperature material liquid 7 flows out from the region, is heated by a heater 8 and then flows into the high-temperature material liquid channel.
In the heat exchange zone, the space between the distillation membrane 3 and the cooling plate 9 is filled with water, defined herein as a water layer 4 (quality identical to the produced water 6).
The feed liquid 2 flows into the feed liquid side channel after being heated by the heater 8, is vaporized into water vapor on the surface of the distillation membrane 3 and passes through the membrane holes, and is rapidly cooled into water by the water layer 4 between the distillation membrane 3 and the cooling plate 9 on the other side of the distillation membrane 3. The latent heat of vaporization of the vapor is transferred to the water layer between the distillation membrane 3 and the cooling plate 9. Moreover, a heat conduction structure exists between the distillation membrane 3 and the cooling plate 9, so that heat in water is efficiently transferred to the low-temperature feed liquid, the low-temperature feed liquid is heated, the energy consumption of the heater is reduced, and the heat is effectively utilized.
The heat conducting structure is a cooling fin 5 or a micro-channel structure and the like. Fig. 2 shows a schematic view of the mechanism of the heat conducting structure. The cooling fins 5 can increase the heat exchange area between the low-temperature feed liquid and the water layer, and efficiently transfer the heat in the water to the low-temperature feed liquid. Used for heating low-temperature feed liquid. The cooling fin 5 may be a rod-shaped member protruding from the cooling fin, or may be a thin tube protruding from the cooling fin, and a cooling liquid may flow through the thin tube. The cooling fins 5 may be provided with a plurality of protrusions to increase the surface area.
The cooling fin 5 may be formed by winding a narrow tube in which a cooling liquid flows. Fig. 3 shows a cross-sectional view of such a cooling fin. The micro-channels are formed in the fins and used for enhancing heat exchange between the water layer and the low-temperature feed liquid, and the heat exchange performance of the fin is more outstanding.
The utility model discloses an advantage lies in combining direct contact membrane distillation and air gap formula membrane distillation's advantage for under the prerequisite that does not influence membrane distillation efficiency, utilize the heat heating low temperature feed liquid of high temperature feed liquid, and then realize thermal effective recycle. The design of heat conduction structure makes the heat efficient transmission in the high temperature feed liquid to the low temperature feed liquid for heat exchange efficiency is higher, and the heater energy consumption is littleer, and membrane distillation's efficiency and water making are than higher.
For example, at a hot feed inlet temperature of 85 ℃ and a cold feed inlet temperature of 27 ℃, the permeation flux of the air gap membrane distillation module is 4L/m2h, the permeation flux can reach 9.5L/m by using the novel membrane distillation structure2h. The permeate flux increased 2.3 times. MakeThe water ratio also increased from 3 to 7. The illustration shows that the novel membrane distillation structure can fully utilize the heat of steam, and the energy saving capability is obviously enhanced. Meanwhile, the permeation flux of unit membrane area is obviously enhanced, and the membrane distillation efficiency is obviously improved.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the ordinary changes and substitutions performed by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A novel air gap type membrane distillation structure for enhancing condensation, comprising:
the high-temperature feed liquid channel is divided by a first partition plate (1) and a distillation membrane (3);
a heat exchange zone which is divided by the distillation membrane (3) and the cooling plate (9);
the low-temperature feed liquid channel is divided by a cooling plate (9) and a second partition plate (10);
and the heat conduction structure is positioned in the heat exchange area, an air gap is reserved between the heat conduction structure and the distillation membrane (3), and water is filled between the heat conduction structure and the distillation membrane (3).
2. The novel condensation enhanced air gap membrane distillation structure as claimed in claim 1, further comprising:
the heater (8) is connected between the high-temperature material liquid channel and the low-temperature material liquid channel, wherein the low-temperature material liquid (7) in the low-temperature material liquid channel flows into the high-temperature material liquid channel after being heated by the heater (8).
3. The novel condensation enhanced air gap membrane distillation structure according to claim 1,
a water layer (4) flows through the heat conducting structure.
4. The novel condensation enhanced air gap membrane distillation structure according to claim 1,
the heat conduction structure is a cooling fin (5), and one side of the cooling fin (5) is in contact with the cooling plate (9).
5. The novel condensation enhanced air gap membrane distillation structure according to claim 4,
the cooling fin (5) is a microstructure, and a microtube is arranged in the cooling fin and used for cooling liquid to flow through.
6. The novel condensation enhanced air gap membrane distillation structure according to claim 5,
the cooling fins (5) are of a spiral structure.
7. The novel condensation enhanced air gap membrane distillation structure according to claim 6,
and the cooling fins (5) are provided with bulges.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921509017.4U CN210964665U (en) | 2019-09-11 | 2019-09-11 | Novel air gap type membrane distillation structure for strengthening condensation |
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| CN201921509017.4U CN210964665U (en) | 2019-09-11 | 2019-09-11 | Novel air gap type membrane distillation structure for strengthening condensation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538573A (en) * | 2019-09-11 | 2019-12-06 | 华北电力大学 | Improved air gap type membrane distillation structure |
| CN113546520A (en) * | 2021-08-02 | 2021-10-26 | 兰州理工大学 | Air gap type membrane distillation cooling assembly with multiple cooling sources for cooling |
-
2019
- 2019-09-11 CN CN201921509017.4U patent/CN210964665U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538573A (en) * | 2019-09-11 | 2019-12-06 | 华北电力大学 | Improved air gap type membrane distillation structure |
| CN113546520A (en) * | 2021-08-02 | 2021-10-26 | 兰州理工大学 | Air gap type membrane distillation cooling assembly with multiple cooling sources for cooling |
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