CN111928692A - Anti-icing method for tubular heat exchanger - Google Patents
Anti-icing method for tubular heat exchanger Download PDFInfo
- Publication number
- CN111928692A CN111928692A CN202010658333.9A CN202010658333A CN111928692A CN 111928692 A CN111928692 A CN 111928692A CN 202010658333 A CN202010658333 A CN 202010658333A CN 111928692 A CN111928692 A CN 111928692A
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- Prior art keywords
- ice
- icing
- coating
- heat exchanger
- method comprises
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
Abstract
The invention discloses an anti-icing method of a tubular heat exchanger, which is characterized in that a discontinuous ice-repellent coating is manufactured on the inner side of a metal tube of the tubular heat exchanger, and the icing area of a metal matrix is controlled by utilizing the ice-repellent characteristic of the ice-repellent coating. The icing area of the metal matrix is controlled by the discontinuous ice-resistant coating, on one hand, the ice layer is easy to be washed away by water flow in the pipe due to the small icing area, and on the other hand, the adhesion force of the ice and the interface is reduced due to the different interface adhesion forces of the ice and different materials, and the ice and the interface adhesion forces are easier to be washed away from the wall surface by the water flow due to the action of internal stress in the icing process, so that the aim of preventing ice is fulfilled, the occurrence of ice blockage in a heat exchanger is reduced, and the stability of the dynamic ice making process of supercooled water is improved.
Description
Technical Field
The invention relates to the field of supercooled water ice making, in particular to an anti-icing method of a tubular heat exchanger.
Background
The ice making is widely applied to the fields of ice cold storage air conditioners, vegetable and fruit seafood preservation, precooling, refrigeration and the like. Currently, ice making is mainly classified into two methods, static ice making and dynamic ice making. The supercooled water dynamic ice making has the advantages of high energy efficiency, compact structure and the like, and is in the process of gradual commercialization. However, in the dynamic ice making process by using supercooled water, the frequent occurrence of ice blockage seriously affects the normal operation of ice making and reduces the ice making efficiency, and is a pain point problem in the industry at present. The ice blockage generally occurs in the supercooled water heat exchanger, so that the problem of ice blockage of supercooled water in the heat exchanger is solved, and the ice blockage device has great significance for the supercooled water dynamic ice making industry.
Because the supercooled water is in an unstable state, ice crystals are easy to generate and adhere to the metal wall surface when the supercooled water is disturbed, and further ice blockage is easy to cause along with the continuous growth of the ice crystals. The existing anti-icing technology is mainly applied to airplanes, high-altitude cables and other occasions, the cold quantity and the frozen liquid water of the anti-icing technology come from the same direction and are different from a heat exchanger, and therefore the anti-icing principle is different. At present, the anti-icing method is mostly adopted, and the method that the surface is coated with super-hydrophobic materials or silicon material arrays and the like is adopted, and the principle is that the energy barrier of nucleation on the metal surface is improved, so that the aim of inhibiting icing is fulfilled. However, coating materials generally only delay the time of icing and do not completely prevent icing on the surface.
Disclosure of Invention
The invention aims to provide an anti-icing method of a tubular heat exchanger aiming at the defects of the prior art, so that the occurrence of ice blockage in the heat exchanger is reduced, and the stability of the dynamic ice making process of supercooled water is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
an anti-icing method for a tubular heat exchanger is characterized in that a discontinuous anti-icing coating is manufactured on the inner side of a metal tube of the tubular heat exchanger, and the icing area of a metal matrix is controlled by utilizing the anti-icing characteristic of the anti-icing coating.
As a improvement of the invention, the shape of the anaerobic coating is annular and is arranged at intervals along the axial direction of the metal pipe. The annular coating is combined with the surface of the substrate more tightly and is not easy to fall off.
As another improvement of the invention, the shape of the anaerobic coating is block-shaped and is arranged in a dot array mode.
Further, the width of the anaerobic coating is between 100 microns and 1000 microns.
Further, the anaerobic coatings are spaced between 100 microns and 1000 microns apart.
Further, the thickness of the anaerobic coating is not more than 100 microns.
Further, the total area of the anti-icing coating exceeds half of the total area of the inner side of the metal pipe.
Further, the anaerobic coating is processed by adopting a dipping, spraying or vapor deposition method.
Furthermore, the ice-resistant coating is made of a low-surface-energy material which is not easy to freeze. For example: high polymer material, super-lubricating material, graphene and the like
Further, the thermal conductivity of the anaerobic coating is higher than 0.5W/m-K.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the discontinuous ice-resistant coating, not prevents the wall surface from being completely unfrozen, but controls the icing area, on one hand, the forming shape of ice on the metal surface is controlled, the separated small-area ice layer is easily washed away by water flow, on the other hand, the adhesion force of ice, the metal matrix and the ice-resistant coating material interface is different, and the internal stress is generated in the icing process, so that the adhesion force of ice and the interface is reduced, and the ice is more easily washed away from the wall surface by the water flow, thereby achieving the aim of ice prevention.
Drawings
FIG. 1 is a schematic view of the discontinuous annular anaerobic coating inside a tube according to the present invention.
FIG. 2 is a schematic view of the inventive tube inside discontinuous point array anaerobic coating.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The tube type heat exchanger applied by the invention is internally composed of one or more metal tubes which are arranged at intervals, and the cross section of each tube is circular or other closed shapes. The medium at the inner side of the metal tube is water, and the medium at the outer side is a low-temperature liquid medium with the temperature lower than-3 ℃, such as ethylene glycol antifreeze liquid, refrigerant and the like.
As shown in figure 1, according to the anti-icing method of the tubular heat exchanger, a discontinuous ice-resistant coating 1 is manufactured on the inner side of a metal tube 3, the icing area of a metal base body 2 is controlled by using the ice-resistant characteristic of the ice-resistant coating 1, so that the area of the ice layer is reduced and the ice layer is easily washed away by water flow in the tube, further, the adhesion force of ice to the material interfaces of the metal base body 2 and the ice-resistant coating 1 is different, internal stress can be generated in the icing process, and the adhesion force of ice to the wall surface is reduced under the action of the internal stress and is more easily washed away by the water flow.
Preferably, the anaerobic coating layer 1 is formed in a ring shape as shown in fig. 1 and is axially spaced along the metal pipe 3. Thus, the ice-resistant coatings 1 and the metal matrix 2 are alternately distributed, and thin annular ice is formed in the metal pipe 3 and is easily washed away by water flow. Meanwhile, the annular coating is combined with the surface of the substrate more tightly and is not easy to fall off.
As another possibility, the anaerobic coating 3 is in the shape of a block arranged in a dot array inside the metal tube 3, as shown in fig. 2.
Preferably, the thickness of the anaerobic coating 1 is not more than 100 microns, the width is between 100 microns and 1000 microns, the mutual interval is between 100 microns and 1000 microns, and the total area is more than half of the total area of the inner side of the metal tube 3.
The anaerobic coating 1 can be processed by adopting a dipping method, a spraying method and a vapor deposition method. During processing, firstly covering a diaphragm material with a specific ring shape on the surface of the inner side of the metal pipe 3, then carrying out surface treatment by adopting methods such as dipping, spraying, vapor deposition and the like, and taking away the diaphragm material after standing and heat treatment processes to obtain the discontinuous ice-resistant coating 1 on the inner side of the pipe.
The ice-resistant coating 1 is made of a low-surface-energy material which is not easy to freeze, such as a high-molecular material, a super-lubricating material, graphene and the like. The anaerobic coating 1 should have a high thermal conductivity, which should not be lower than 0.5W/m-K.
It will be readily understood that the method can also be used in plate heat exchangers, in which the ice-phobic coating 1 can be designed as a discontinuous strip-shaped array.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. An anti-icing method for a tubular heat exchanger is characterized in that: and manufacturing a discontinuous ice-repellent coating on the inner side of the metal pipe of the pipe type heat exchanger, and controlling the icing area of the metal matrix by using the ice-repellent characteristic of the ice-repellent coating.
2. The method of claim 1, wherein the method comprises: the shape of the ice-resistant coating is annular and is arranged at intervals along the axial direction of the metal pipe.
3. The method of claim 1, wherein the method comprises: the shape of the ice-resistant coating is blocky and is arranged in a dot array mode.
4. The method of claim 2, wherein the method comprises: the width of the anti-icing coating is between 100 microns and 1000 microns.
5. The method of claim 4, wherein the method comprises: the anaerobic coatings are spaced between 100 microns and 1000 microns apart.
6. The method of claim 1, wherein the method comprises: the thickness of the anaerobic coating is not more than 100 microns.
7. The method of claim 1, wherein the method comprises: the total area of the ice-resistant coating exceeds half of the total area of the inner side of the metal pipe.
8. The method of claim 1, wherein the method comprises: the ice-resistant coating is processed by adopting a dipping, spraying or vapor deposition method.
9. The method of claim 8, wherein the method comprises: the ice-resistant coating is made of a low-surface-energy material which is not easy to freeze.
10. The method of claim 1, wherein the method comprises: the thermal conductivity of the ice-resistant coating is higher than 0.5W/m-K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010658333.9A CN111928692A (en) | 2020-07-09 | 2020-07-09 | Anti-icing method for tubular heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010658333.9A CN111928692A (en) | 2020-07-09 | 2020-07-09 | Anti-icing method for tubular heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN111928692A true CN111928692A (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010658333.9A Pending CN111928692A (en) | 2020-07-09 | 2020-07-09 | Anti-icing method for tubular heat exchanger |
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| CN (1) | CN111928692A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117233085A (en) * | 2023-11-14 | 2023-12-15 | 中国空气动力研究与发展中心低速空气动力研究所 | Ice layer adhesion force testing device and method |
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| CN102268222A (en) * | 2011-08-17 | 2011-12-07 | 天津大学 | Icing-resisting paint containing alkane phase change microcapsules and preparation method thereof |
| CN102746782A (en) * | 2011-04-18 | 2012-10-24 | 中国科学院化学研究所 | Anti-icing and anti-frosting polyurethane coating and preparation method thereof |
| CN106752214A (en) * | 2017-01-13 | 2017-05-31 | 吉林大学 | A kind of bionical anti-freeze surface based on the improvement of noncontinuity wetability |
| CN107246751A (en) * | 2017-05-19 | 2017-10-13 | 浙江海洋大学 | It is a kind of to solve the seawater fluidisation icing equipment that ice blocks up phenomenon |
| CN109794404A (en) * | 2019-01-25 | 2019-05-24 | 南京航空航天大学 | Anti- deicing component of a kind of electric heating with superhydrophobic characteristic and preparation method thereof |
| CN110760224A (en) * | 2019-10-31 | 2020-02-07 | 三峡大学 | Preparation method of super-hydrophobic film |
| CN111094477A (en) * | 2017-09-07 | 2020-05-01 | 陶氏环球技术有限责任公司 | Heat and ice conductive coating |
-
2020
- 2020-07-09 CN CN202010658333.9A patent/CN111928692A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102746782A (en) * | 2011-04-18 | 2012-10-24 | 中国科学院化学研究所 | Anti-icing and anti-frosting polyurethane coating and preparation method thereof |
| CN102268222A (en) * | 2011-08-17 | 2011-12-07 | 天津大学 | Icing-resisting paint containing alkane phase change microcapsules and preparation method thereof |
| CN106752214A (en) * | 2017-01-13 | 2017-05-31 | 吉林大学 | A kind of bionical anti-freeze surface based on the improvement of noncontinuity wetability |
| CN106752214B (en) * | 2017-01-13 | 2020-01-31 | 吉林大学 | bionic anti-icing surface based on improvement of non-continuous wettability |
| CN107246751A (en) * | 2017-05-19 | 2017-10-13 | 浙江海洋大学 | It is a kind of to solve the seawater fluidisation icing equipment that ice blocks up phenomenon |
| CN111094477A (en) * | 2017-09-07 | 2020-05-01 | 陶氏环球技术有限责任公司 | Heat and ice conductive coating |
| CN109794404A (en) * | 2019-01-25 | 2019-05-24 | 南京航空航天大学 | Anti- deicing component of a kind of electric heating with superhydrophobic characteristic and preparation method thereof |
| CN110760224A (en) * | 2019-10-31 | 2020-02-07 | 三峡大学 | Preparation method of super-hydrophobic film |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117233085A (en) * | 2023-11-14 | 2023-12-15 | 中国空气动力研究与发展中心低速空气动力研究所 | Ice layer adhesion force testing device and method |
| CN117233085B (en) * | 2023-11-14 | 2024-01-12 | 中国空气动力研究与发展中心低速空气动力研究所 | Ice layer adhesion force testing device and method |
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Application publication date: 20201113 |