CN116518750A - Heat exchanger for improving flue gas waste heat recovery efficiency and built-in vortex generator thereof - Google Patents
Heat exchanger for improving flue gas waste heat recovery efficiency and built-in vortex generator thereof Download PDFInfo
- Publication number
- CN116518750A CN116518750A CN202310470270.8A CN202310470270A CN116518750A CN 116518750 A CN116518750 A CN 116518750A CN 202310470270 A CN202310470270 A CN 202310470270A CN 116518750 A CN116518750 A CN 116518750A
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- vortex generator
- vortex
- heat exchange
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000002918 waste heat Substances 0.000 title abstract description 15
- 238000011084 recovery Methods 0.000 title abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 230000002708 enhancing effect Effects 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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
- F28D7/08—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 the conduits being otherwise bent, e.g. in a serpentine or zig-zag
- F28D7/082—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 the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F28D7/005—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 the conduits for only one medium being tubes having bent portions or being assembled from bent tubes or being tubes having a toroidal configuration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses an eddy current generator for enhancing the intensity of convection heat transfer in a circular tube, which comprises connecting wires, wherein the connecting wires are wound on turbulence wings, the turbulence wings are connected end to form the eddy current generator, and through holes are formed in the turbulence wings. Meanwhile, the invention also discloses a heat exchanger for enhancing the flue gas waste heat recovery efficiency, the heat exchanger is provided with fluid inlet and outlet pipes, the vortex generators are arranged in the heat exchange pipes in the heat exchanger box body at intervals, and the heat exchange pipes are connected through connecting pipes. By arranging the vortex generator in the heat exchange tube, fluid disturbance in the tube is promoted, so that the convection heat transfer intensity is enhanced, and the waste heat recovery efficiency of the flue gas is improved.
Description
Technical Field
The invention relates to the field of flue gas waste heat recovery, in particular to a heat exchanger for improving flue gas waste heat recovery efficiency and a built-in vortex generator thereof.
Background
As the demand for energy is continuously increasing, the full use of energy has been increasingly attracting attention. In the field of waste heat recovery, there is an urgent need for efficient means for recovering this energy for the waste heat utilization of flue gases. The heat exchanger can be used as an efficient heat transfer device for recovering the waste heat of the flue gas of the kitchen gas stove. Previous studies have shown that varying the surface roughness and fluid medium of the heat exchange tubes within the heat exchanger can enhance heat transfer. However, due to the high cost of use of certain materials and media, they are not readily available and some metals have proven difficult to process. Therefore, a technology of applying a vortex generator to a heat exchanger is proposed as a solution for improving thermal performance. The function of the insertion vortex generator is to generate longitudinal vortices in the tube, thereby improving the mixing of the wall and the central fluid, which in turn leads to the destruction of the thermal boundary layer. In other words, the overall efficiency of heat transfer is improved, and the waste heat recovery efficiency of flue gas is also enhanced.
Disclosure of Invention
The invention aims to provide a vortex generator for improving heat exchange efficiency.
The invention also provides a heat exchanger with the effect of enhancing the flue gas waste heat recovery efficiency.
The invention has the innovation points that the vortex generators are connected end to end through the flow surrounding wings and through holes on the flow surrounding wings, when the vortex generators are inserted into the heat exchange pipeline, the fluid in the pipe is disturbed due to the action of the vortex generators to generate longitudinal vortex, so that the boundary layer of the wall surface is better damaged, the convection heat transfer is promoted, and the waste heat of the flue gas in the heat exchanger is more effectively absorbed. Meanwhile, due to the through holes on the flow-around wings, jet flow is formed after the fluid passes through the holes, the jet flow influences the recirculation area behind the vortex generator, the stagnant fluid in the area is reduced, and the formation of longitudinal vortex is promoted. In addition, the jet flow is further mixed with the main flow and is further mixed with the main flow under the traction of the central fluid, so that the mixing efficiency of the cold and hot fluid is improved. And because of the through holes, the friction resistance is reduced, so that friction loss is reduced, and the heat transfer efficiency is improved.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the vortex generator comprises a connecting wire, wherein the connecting wire is wound on a vortex wing, the vortex wings are connected end to form the vortex generator, and through holes are formed in the vortex wing.
Further, the upper and lower connecting wires are respectively wound on the two turbulence wings on the opposite sides. The pitch of two adjacent vortex generators can be controlled by the connecting wires, and the vortex generators can be more conveniently placed in the heat exchange tube.
Further, the turbulence wings are connected end to end and are arranged at equal intervals along the circumferential direction, and are connected into a vortex generator. The flow-around wings are connected end to form a symmetrical structure, and the heat exchange of the fluid in the pipe is more uniform due to the equal spacing.
When the number of the turbulence wings is 8, the turbulence intensity in the heat exchange tube is high, longitudinal turbulence is better formed, a thermal boundary layer of a wall surface is damaged, and convection heat transfer is promoted.
Further, small holes are formed in the outer surfaces of all the turbulence wings. After the through holes are formed in the turbulence wing, fluid forms jet flow after passing through the small holes, so that stagnant fluid in a recirculation area is reduced, and heat transfer is promoted. Meanwhile, the small holes can reduce friction resistance in the flowing process, so that friction loss is reduced, and the overall thermal performance is improved.
The heat exchanger with the vortex generator is characterized in that a fluid inlet and outlet pipe is arranged on the heat exchanger, the vortex generator is arranged in heat exchange pipes in a heat exchanger box body at intervals, and the heat exchange pipes are connected through a connecting pipe.
Further, the vortex generators are arranged in the heat exchange tubes in the heat exchanger box body at intervals and are connected through connecting tubes. Vortex generators are placed in the heat exchange tubes at intervals, so that the fluid is continuously disturbed, and meanwhile, the connecting tubes enable the fluid to circulate in the heat exchange channels.
Further, the two adjacent vortex generators are placed in the heat exchange tube at equal intervals, and the interval is 25mm. When the distance between the vortex generators in the pipeline is 25mm, the temperature of the fluid in the pipeline can be more quickly and evenly obtained, and the cold fluid and the hot fluid can be more quickly mixed.
Further, the outer surface of the vortex generator is almost completely attached to the side wall of the heat exchange tube. The close fitting of the vortex generator and the pipeline can make the placement of the vortex generator and the pipeline in the heat exchange pipe more stable, and the boundary layer can be better destroyed.
Further, a flue gas inlet pipe, a flue gas outlet pipe, a water inlet pipe and a water outlet pipe are arranged on the heat exchanger box body. Each pipeline ensures better flow of two fluids in the heat exchanger, and meanwhile, the water inlet pipe is connected with an external water pipe, so that the fluids can flow in a stable state when entering; the water outlet pipe may connect an external water pipe to the water tank, prevent water from flowing back, and store hot water for daily life.
Further, the heat exchange pipes are connected through connecting pipes, and the connecting pipes are U-shaped connecting pipes. The bend of the U-shaped connecting pipe can have a certain disturbance effect on the fluid, so that heat transfer is promoted.
The beneficial effects of the invention are as follows:
1. according to the invention, the vortex generators are connected end to end through the flow-around wings and through holes on the flow-around wings, when the vortex generators are inserted into the heat exchange pipeline, the fluid in the pipe is disturbed due to the action of the vortex generators, so that longitudinal vortex is generated, the boundary layer of the wall surface is better damaged, the convection heat transfer is promoted, and the waste heat of the flue gas in the heat exchanger is more effectively absorbed. Meanwhile, due to the through holes on the flow-around wings, jet flow is formed after the fluid passes through the holes, the jet flow influences the recirculation area behind the vortex generator, the stagnant fluid in the area is reduced, and the formation of longitudinal vortex is promoted. In addition, the jet flow is further mixed with the main flow and is further mixed with the main flow under the traction of the central fluid, so that the mixing efficiency of the cold and hot fluid is improved. And because of the through holes, the friction resistance is reduced, so that friction loss is reduced, and the heat transfer efficiency is improved. When the interval between the vortex generators in the heat exchange tube is smaller, the internal temperature can be more quickly and evenly achieved, cold and hot fluid is better mixed, and the performance of the hot fluid is improved. Therefore, the waste heat absorption of the flue gas is more sufficient, and the flue gas waste heat recovery efficiency is enhanced.
Drawings
Fig. 1 is a schematic structural view of a vortex generator in embodiment 1.
Fig. 2 is a schematic structural view of a spoiler in embodiment 1.
Fig. 3 is a schematic diagram of the combination of the connection wire and the vortex generator in embodiment 1.
FIG. 4 is a schematic view of a heat exchanger in embodiment 2
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Example 1: as shown in fig. 1, 2 and 3, the vortex generator (8) for enhancing the intensity of convective heat transfer in the circular tube comprises a connecting wire (9), wherein the connecting wire (9) is wound on a vortex wing (8-1), the vortex wings (8-1) are connected end to form the vortex generator (8), and through holes are formed in the vortex wing (8-1). The upper and lower connecting wires (9) are respectively wound on the two turbulence wings (8-1) on opposite sides. The turbulence wings (8-1) are connected end to end and are arranged at equal intervals along the circumferential direction, and are connected into a vortex generator (8). The number of the turbulence wings (8-1) on the vortex generator (8) is 8. The outer surfaces of all the turbulence wings (8-1) are provided with small holes (8-2).
Example 2: as shown in fig. 4, a heat exchanger with vortex generators (8) is provided with fluid inlet and outlet pipes, and the vortex generators (8) are arranged in heat exchange pipes (2) in a heat exchanger box body (1) at intervals, and the heat exchange pipes (2) are connected through connecting pipes. Two adjacent vortex generators (8) are placed in the heat exchange tube (2) at equal intervals, and the interval is 25mm. The outer surface of the vortex generator (8) is almost completely attached to the side wall of the heat exchange tube (2). A flue gas inlet pipe (6), a flue gas outlet pipe (7), a water inlet pipe (4) and a water outlet pipe (5) are arranged on the heat exchanger box body (1). The heat exchange tubes (2) are connected through connecting pipes, and the connecting pipes are U-shaped connecting pipes (3).
The described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (11)
1. The invention discloses an eddy current generator for enhancing the intensity of convection heat transfer in a circular tube, which comprises connecting wires, wherein the connecting wires are wound on turbulence wings, the turbulence wings are connected end to form the eddy current generator, and through holes are formed in the turbulence wings.
2. The vortex generator of claim 1 wherein the wire is wrapped around the opposite side turbulence wings.
3. The vortex generator according to claim 1, wherein the turbulence wings are connected end to end, are equally spaced along the circumferential direction, and are connected to form a vortex generator.
4. The vortex generator of claim 1 wherein the number of turbulence wings on the vortex generator is 8.
5. The vortex generator of claim 1 wherein apertures are provided at the outer surfaces of all of the turbulence wings.
6. A heat exchanger with a vortex generator according to any one of claims 1 to 5, wherein the heat exchanger is provided with fluid inlet and outlet pipes, and the vortex generator is placed at intervals in heat exchange pipes in the heat exchanger box, the heat exchange pipes being connected by connecting pipes.
7. The heat exchanger with vortex generator according to claim 6, wherein the vortex generators are placed at intervals in the heat exchange tubes in the heat exchanger case, and are connected by connection tubes.
8. The heat exchanger with vortex generators according to claim 6, wherein the adjacent two sets of vortex generators are placed in the heat exchange tube at equal intervals, and the interval is 25mm.
9. The heat exchanger with a vortex generator of claim 6 wherein the vortex generator outer surface is nearly fully conformed to the heat exchange tube side wall.
10. The heat exchanger with vortex generator according to claim 6, wherein the heat exchanger box is provided with a flue gas inlet pipe, a flue gas outlet pipe, a water inlet pipe, and a water outlet pipe.
11. The heat exchanger with a vortex generator according to claim 6, wherein the heat exchange tubes are connected by a connection tube, and the connection tube is a U-shaped connection tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310470270.8A CN116518750A (en) | 2023-04-27 | 2023-04-27 | Heat exchanger for improving flue gas waste heat recovery efficiency and built-in vortex generator thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310470270.8A CN116518750A (en) | 2023-04-27 | 2023-04-27 | Heat exchanger for improving flue gas waste heat recovery efficiency and built-in vortex generator thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116518750A true CN116518750A (en) | 2023-08-01 |
Family
ID=87391570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310470270.8A Pending CN116518750A (en) | 2023-04-27 | 2023-04-27 | Heat exchanger for improving flue gas waste heat recovery efficiency and built-in vortex generator thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116518750A (en) |
-
2023
- 2023-04-27 CN CN202310470270.8A patent/CN116518750A/en active Pending
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