CN112797834A - Heat exchange tube fin with corrugations - Google Patents
Heat exchange tube fin with corrugations Download PDFInfo
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- CN112797834A CN112797834A CN202011630679.4A CN202011630679A CN112797834A CN 112797834 A CN112797834 A CN 112797834A CN 202011630679 A CN202011630679 A CN 202011630679A CN 112797834 A CN112797834 A CN 112797834A
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- fin
- area
- heat exchange
- fins
- windward
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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
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
- F28F1/128—Fins with openings, e.g. louvered fins
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a corrugated heat exchange tube fin, wherein grooves and extension chamfers are arranged on two sides of the fin, and the grooves are divided into windward areas along the flowing direction of flue gas to strengthen heat exchange areas and leeward areas; the windward area and the strengthened heat exchange area are provided with a large number of ripples with streamline structures, and the leeward area is a fin with gradually changed thickness. The structure has good heat exchange performance and small flow resistance, has good flue gas waste heat recovery effect, can effectively improve the air flow separation and backflow phenomenon in a leeward area, enhances the cooperativity of a fin temperature field and flue gas speed, improves the heat exchange efficiency, effectively reduces dust deposition and avoids the blockage of a flow channel.
Description
Technical Field
The invention relates to a heat exchange tube fin, in particular to a heat exchange tube fin with corrugations for waste heat recovery, which is suitable for various types of heat exchange and heating equipment in the industries of petroleum, chemical engineering, metallurgy, electric power, energy and the like.
Background
Energy is an important basis for the economic and social progress of human beings, and along with the continuous increase of energy consumption in China, energy conservation and emission reduction become a long-term guideline for the economic and social development in China. The proportion of the thermal power plant in the power industry is the largest, and the improvement of the energy utilization efficiency of the thermal power unit is very urgent. The heat-engine plant is usually provided with an economizer to recover the waste heat of the flue gas so as to achieve the purpose of energy conservation. It is a common way to increase the heat exchange area of the heat exchange tube by adding fins so as to enhance the heat exchange.
At present, more H-shaped fins and more annular fins are used for generating airflow separation and backflow in a leeward area during heat exchange, dust particles are difficult to flow among different fins, therefore, dust deposition is easy to form, and fins with lower fin ratio are usually adopted for reducing the influence of the dust deposition on the heat exchange, so that the heat exchanger is larger in size.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a corrugated heat exchange tube fin which is a flue gas waste heat recovery fin with good heat exchange performance, small flow resistance and high heat exchange efficiency. The novel heat exchanger can effectively improve the air flow separation and backflow phenomena in a leeward area, enhance the cooperativity of a fin temperature field and the flue gas speed, improve the heat exchange efficiency, effectively reduce dust deposition and avoid the blockage of a flow channel.
The invention adopts the following technical scheme:
a corrugated heat exchange tube fin comprises a windward area 1, a heat exchange strengthening area 2, a leeward area 3, an arc windward surface 4, an extension chamfer 5, a leeward area tail end 6, corrugations 7 and grooves 9; the fins are symmetrically and uniformly provided with a plurality of grooves 9 along the two sides of the flow direction of the flue gas, the part of the fins from the position where the flue gas enters the fins to the beginning where the first groove 9 appears is a windward area 1 along the flow direction of the flue gas, the part of the fins from the beginning to the last groove 9 where the flue gas passes through is a heat exchange strengthening area 2, and the part of the fins from the end of the last groove 9 to the tail end of the fins is a leeward area 3; the windward area 1 is provided with an arc windward side 4, and the part, which is 4 times of the thickness of the fins of the windward area, on the windward area 1 is provided with corrugations 7; in the heat exchange strengthening area 2, the corrugations 7 are arranged between every two adjacent grooves 9, the thickness of the fins at the tail end 6 of the leeward area is gradually reduced, and the fins finally become half of the thickness of the heat exchange strengthening area 2.
The area of the windward area 1 is larger than that of the leeward area 3.
The fins are integrally formed by stamping, and the corrugations 7 on the fins are stamped on the fins.
The number of said grooves 9 is four.
The arc windward side 4 is the surface of the smoke firstly contacting with the fins, and the section is a semicircle taking the thickness of the fins in the windward area 1 as the diameter.
The corrugations 7 are positioned in 2 groups of the fin windward area 1 and the heat exchange strengthening area 2, and each group of corrugations 7 consists of five protrusions 8; the distribution direction of the five bulges 8 is vertical to the symmetry axis of the fin, wherein the symmetry axis of the third bulge 8 is superposed with the symmetry axis of the fin, and the other four bulges 8 are symmetrically distributed on two sides of the third bulge 8 along the symmetry axis of the fin; the interval between two adjacent protrusions 8 is twice the fin thickness at the windward region 1.
The head of the protrusion 8 is a hemisphere, the tail of the protrusion is a semi-cone, the length of the protrusion 8 along the smoke flowing direction is eight times of the thickness of the fins at the windward area 1, and the height of the protrusion 8 exceeding the thickness of the fins in the direction perpendicular to the plane of the fins is 1.5 times of the thickness of the windward area 1.
The edge of the groove 9 is provided with an extension chamfer 5, the extension chamfer 5 and the protrusion 7 are arranged on the same surface of the fin, the height of the protrusion 7, which exceeds the thickness of the fin in the direction perpendicular to the plane of the fin, is the height of the extension chamfer 5, and the height of the extension chamfer 5 is twice of the thickness of the fin in the windward area 1.
Compared with the prior art, the invention has the following advantages:
1) the windward area 1 has better heat exchange conditions, the arc windward surface can play a certain role in carding and guiding airflow, and the blockage of a flat surface to the airflow can be reduced, so that the shape resistance is reduced, and the pressure loss is effectively reduced. The area of the windward area 1 is larger than that of the leeward area 3, and the windward area 1 with good heat exchange is larger due to the eccentric design, so that the heat exchange effect is better.
2) The windward area 1 and the heat exchange strengthening area 2 are provided with a plurality of streamline corrugations 7, the corrugations 7 are formed by stamping, one surface is convex, the other surface is concave, a series of longitudinal vortexes can be generated behind one surface of the convex 8, backflow can be generated in a concave blind hole due to rapid relaxation and contraction of flow beams on the concave surface, airflow is disturbed, so that a heat boundary layer of the fin is damaged, heat exchange disturbance can be effectively strengthened on the two surfaces, and meanwhile, the heat exchange area is increased. The ripple resistance is small in the forward flow, but the reverse flow generates a large flow resistance, and therefore, the backflow is reduced or even eliminated, thereby reducing the accumulation of the accumulated dust. The corrugated head adopts the hemispherical design, so that the abrasion of particles in flue gas to the corrugations can be effectively reduced, and the service life of the finned tube is prolonged.
3) The heat exchange of the leeward area 3 adopts the design of variable cross-section fins, the weight of the fins can be effectively reduced, and the fins are integrally round at the head part and slender at the tail part, so that the flow resistance can be effectively reduced.
4) With the mode of extension chamfer 5, can let welding process more convenient, processing need not to compress tightly with equipment, and can reduce the too big problem of contact thermal resistance that leads to because fin surface roughness is too big, and the gap of chamfer and parent tube is filled completely to the fuse during welding processing, consequently can greatly increased fin and parent tube's area of contact.
5) Compared with common annular fins and H-shaped fins, the finned tube heat exchanger can ensure that the dust deposition degree is equivalent to that of other finned tubes, simultaneously reduces the volume of the heat exchanger, reduces the difficulty of heat exchanger arrangement, and increases the integral rigidity of the heat exchanger.
Drawings
FIG. 1 is an isometric view of a fin of the present invention.
FIG. 2 is an enlarged view of the corrugations in the fin of the present invention.
FIG. 3 is a schematic view of a heat exchanger formed by welding fins and a base pipe according to the present invention.
Detailed Description
The invention is further described in detail below with reference to the drawings and the detailed description so that the advantages and features of the invention can be more easily understood by those skilled in the art, and the scope of the invention is more clearly and clearly defined.
As shown in fig. 1, a corrugated heat exchange tube fin comprises a windward area 1, a heat exchange strengthening area 2, a leeward area 3, an arc windward surface 4, an extension chamfer 5, a leeward area tail end 6, corrugations 7 and grooves 9; the fins are symmetrically and uniformly provided with a plurality of grooves 9 along the two sides of the flow direction of the flue gas, the part of the fins from the position where the flue gas enters the fins to the beginning where the first groove 9 appears is a windward area 1 along the flow direction of the flue gas, the part of the fins from the beginning to the last groove 9 where the flue gas passes through is a heat exchange strengthening area 2, and the part of the fins from the end of the last groove 9 to the tail end of the fins is a leeward area 3; the windward area 1 is provided with an arc windward side 4, and the part, which is 4 times of the thickness of the fins of the windward area, on the windward area 1 is provided with corrugations 7; in the heat exchange strengthening area 2, the corrugations 7 are arranged between every two adjacent grooves 9, the thickness of the fins at the tail end 6 of the leeward area is gradually reduced, and the fins finally become half of the thickness of the heat exchange strengthening area 2.
As a preferred embodiment of the invention, the area of the windward area 1 is larger than the area of the leeward area 3.
As a preferred embodiment of the invention, the arc windward side 4 is the side of the smoke firstly contacting with the fins, and the section is a semicircle with the thickness of the fins in the windward area 1 as the diameter.
As a preferred embodiment of the invention, the corrugations 7 are located in 2 groups of the fin windward region 1 and the heat exchange enhancement region 2, as shown in fig. 2, each group of corrugations 7 is composed of five protrusions 8; the distribution direction of the five bulges 8 is vertical to the symmetry axis of the fin, wherein the symmetry axis of the third bulge 8 is superposed with the symmetry axis of the fin, and the other four bulges 8 are symmetrically distributed on two sides of the third bulge 8 along the symmetry axis of the fin; the interval between two adjacent protrusions 8 is twice the fin thickness at the windward region 1. The head of the bulge 8 is a hemisphere, the tail of the bulge is a semi-cone, the length of the bulge 8 along the smoke flowing direction is eight times of the thickness of the fins at the windward area 1, and the height of the bulge 8 exceeding the thickness of the fins in the direction perpendicular to the plane of the fins is 1.5 times of the thickness of the windward area 1.
As the preferred embodiment of the invention, the fins are integrally formed by stamping, the corrugations on the fins are stamped on the fins, the fins and the base tube are welded, the heat exchanger is continuously welded, as shown in figure 3, half fins are adopted at the beginning and the end of the welding, the connecting part of the extension chamfer 5 and the fins is welded and connected, and the gaps are welded and filled, so that the contact area between the fins and the base tube can be greatly increased, and the thermal contact resistance is basically eliminated. The fins are of rectangular structures, the head parts of the fins in the windward area 1 are semicircles with the thickness of the fins as the diameter, the corrugations are positioned in the windward area 1 and the heat exchange strengthening area 2, and the bulges 8 are characterized by round head parts and slender tail parts. The leeward region is a variable thickness fin. The fin and the welding part of the base pipe are provided with an extension chamfer 5, and the height of the chamfer is two times of the thickness of the fin.
The finned tube provided by the invention has the advantage that the area of the fin in the windward area 1 part is larger than that of the fin in the leeward area 3 part. When the flue gas flows in the finned tube bundle, obvious gas flow separation and reflux areas can appear in the finned tube leeward area 3 and the heat exchange enhancement area 2. Because the streamline finned tube adopted by the invention does not leave fin gaps any more, the fin area is larger, and the reflux quantity is smaller. The overall heat exchange performance of the heat exchanger is improved, and the ash deposition amount is reduced.
Claims (8)
1. The utility model provides a heat exchange tube fin with ripple which characterized in that: the heat exchange fin comprises a windward area (1), a heat exchange enhancement area (2), a leeward area (3), an arc windward surface (4), an extension chamfer (5), a leeward area tail end (6), corrugations (7) and grooves ((9), wherein the fins are symmetrically and uniformly provided with a plurality of grooves ((9) along the two sides of the flow direction of flue gas, the part of the fins from the position where the flue gas enters the fins to the position where the first grooves (9) appear is the windward area (1), the part of the fins from the first grooves (9) passing through the flow direction of the flue gas to the position where the last grooves (9) end is the heat exchange enhancement area (2), the part of the fins from the last grooves (9) to the tail end of the fins is the leeward area (3), the windward area (1) is provided with the arc windward surface (4), the corrugations (7) are arranged on the windward area (1) ten times of the thickness of the arc windward area (4), and the heat exchange enhancement area (2), the middle of every two adjacent grooves (9) is provided with a corrugation (7), the thickness of the fin at the tail end (6) of the leeward area is gradually reduced, and finally the thickness of the fin is half of that of the heat exchange strengthening area (2).
2. The novel corrugated heat exchange tube fin as claimed in claim 1, wherein: the area of the windward area (1) is larger than that of the leeward area (3).
3. The novel corrugated heat exchange tube fin as claimed in claim 1, wherein: the fins are integrally formed by stamping, and the corrugations (7) on the fins are stamped on the fins.
4. The novel corrugated heat exchange tube fin as claimed in claim 1, wherein: the number of the grooves (9) is four.
5. The novel corrugated heat exchange tube fin as claimed in claim 1, wherein: the arc windward side (4) is the side of the smoke firstly contacting with the fins, and the cross section is a semicircle taking the thickness of the fins in the windward area (1) as the diameter.
6. The novel corrugated heat exchange tube fin as claimed in claim 1, wherein: the corrugations (7) are positioned in 2 groups of the fin windward area (1) and the heat exchange strengthening area (2), and each group of corrugations (7) consists of five bulges (8); the distribution direction of the five bulges (8) is vertical to the symmetry axis of the fin, wherein the symmetry axis of the third bulge (8) is superposed with the symmetry axis of the fin, and the other four bulges (8) are symmetrically distributed on two sides of the third bulge (8) along the symmetry axis of the fin; the interval between two adjacent bulges (8) is twice of the thickness of the fin at the windward area (1).
7. The novel corrugated heat exchange tube fin as claimed in claim 6, wherein in the smoke flowing direction, the head of the protrusion (8) is a hemisphere, the tail of the protrusion is a half cone, the length of the protrusion (8) in the smoke flowing direction is eight times of the thickness of the fin at the windward area (1), and the height exceeding the thickness of the fin in the direction perpendicular to the plane of the fin is 1.5 times of the thickness of the windward area (1).
8. The novel corrugated heat exchange tube fin as claimed in claim 1, wherein: the edge of the groove (9) is provided with an extension chamfer (5), the extension chamfer (5) and the protrusion (7) are arranged on the same surface of the fin, the protrusion (7) exceeds the thickness of the fin in the direction perpendicular to the plane of the fin and is as high as the extension chamfer (5), and the height of the extension chamfer (5) is twice as high as the thickness of the fin in the windward area (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011630679.4A CN112797834B (en) | 2020-12-30 | 2020-12-30 | Heat exchange tube fin with corrugations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011630679.4A CN112797834B (en) | 2020-12-30 | 2020-12-30 | Heat exchange tube fin with corrugations |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112797834A true CN112797834A (en) | 2021-05-14 |
| CN112797834B CN112797834B (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011630679.4A Active CN112797834B (en) | 2020-12-30 | 2020-12-30 | Heat exchange tube fin with corrugations |
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| Country | Link |
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| CN (1) | CN112797834B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607470A (en) * | 2022-03-18 | 2022-06-10 | 中国联合重型燃气轮机技术有限公司 | Blade and gas turbine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170343301A1 (en) * | 2016-05-25 | 2017-11-30 | Nova Chemicals (International) S.A. | Furnace coil modified fins |
| CN107941068A (en) * | 2017-11-15 | 2018-04-20 | 广东美的制冷设备有限公司 | Finned heat exchanger and air conditioner |
| CN108413803A (en) * | 2018-05-17 | 2018-08-17 | 广东美的制冷设备有限公司 | Pipe wing monomer and heat exchanger, air conditioner with it |
| CN109506512A (en) * | 2018-11-11 | 2019-03-22 | 大唐(北京)能源管理有限公司 | A kind of improvement H-type finned tube for waste heat recycling |
| CN211824010U (en) * | 2019-12-30 | 2020-10-30 | 青岛海尔空调器有限总公司 | Device for heat exchange, heat exchanger and household appliance |
-
2020
- 2020-12-30 CN CN202011630679.4A patent/CN112797834B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170343301A1 (en) * | 2016-05-25 | 2017-11-30 | Nova Chemicals (International) S.A. | Furnace coil modified fins |
| CN107941068A (en) * | 2017-11-15 | 2018-04-20 | 广东美的制冷设备有限公司 | Finned heat exchanger and air conditioner |
| CN108413803A (en) * | 2018-05-17 | 2018-08-17 | 广东美的制冷设备有限公司 | Pipe wing monomer and heat exchanger, air conditioner with it |
| CN109506512A (en) * | 2018-11-11 | 2019-03-22 | 大唐(北京)能源管理有限公司 | A kind of improvement H-type finned tube for waste heat recycling |
| CN211824010U (en) * | 2019-12-30 | 2020-10-30 | 青岛海尔空调器有限总公司 | Device for heat exchange, heat exchanger and household appliance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607470A (en) * | 2022-03-18 | 2022-06-10 | 中国联合重型燃气轮机技术有限公司 | Blade and gas turbine |
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| Publication number | Publication date |
|---|---|
| CN112797834B (en) | 2022-02-22 |
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