CN111504076A - Single-row pipe of air-cooling condenser - Google Patents
Single-row pipe of air-cooling condenser Download PDFInfo
- Publication number
- CN111504076A CN111504076A CN202010370149.4A CN202010370149A CN111504076A CN 111504076 A CN111504076 A CN 111504076A CN 202010370149 A CN202010370149 A CN 202010370149A CN 111504076 A CN111504076 A CN 111504076A
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- Prior art keywords
- fins
- air
- fin
- tube
- tubes
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Classifications
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- 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
- F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
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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
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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
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
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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
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a single-row tube of an air-cooled condenser, which comprises a base tube and a snake-shaped fin, wherein the cross section of the base tube is a flat tube, and the external dimension of the cross section of the base tube is 175mm in length and 10-15mm in width; the outer parts of two side surfaces where the long sides of the cross section of the base tube are located are respectively provided with a snake-shaped fin, and the thickness of each snake-shaped fin is 0.1-0.22 mm; the serpentine fins are discontinuous fins or corrugated fins. The invention increases the bearing capacity of the base pipe, the stress of the fins bearing external pressure is greatly reduced, thus the thickness of the fins can be reduced, the fins can be made into a shutter type or bridge plate structure by slotting, and can also be made into a wave type, thereby strengthening heat exchange and further improving the heat exchange performance of the single row of tubes.
Description
Technical Field
The invention relates to a single exhaust pipe of an air-cooling condenser, which is mainly applied to a direct air-cooling condenser for exhausting steam from a low-pressure cylinder of a power station or a coal chemical steam turbine.
Background
At present, a single row of finned tubes are often used as heat exchange elements in a direct air-cooling condenser for low-pressure cylinder steam exhaust of a condensing power station or a coal chemical steam turbine. The single-row tube consists of a base tube and fins welded outside the tube, the base tube is a rectangular flat tube, the fins are serpentine fins, and the fins in the tube bundle of the air-cooling condenser are arranged in a single row.
The single-row pipe has the advantages that the anti-freezing performance is good when the single-row pipe is used in cold regions in winter, the pressure difference in the pipes caused by inconsistent heat loads of the upper and lower heat exchange pipes of the multi-row pipe is avoided, and the phenomena of non-condensable gas accumulation and condensed water freezing are reduced.
However, the long edge size of this finned tube (single row tube) parent tube that uses at present is great, generally is more than 200mm, and the intraductal negative pressure state that is in of during operation, and the long edge rigidity of parent tube is yielding when receiving external pressure effect for a short time, so, the snakelike fin of base tube outside not only has the heat transfer function of reinforceing, but also bears the external pressure of finned tube, and the thickness of snakelike fin plays at least more than 0.25mm, has the effect that reduces the deformation of pressurized parent tube.
The base tube of the single-row tube has poor rigidity, the pressure bearing characteristic of the fins is relied on, the thickness of the fins is limited, the design of the fins is restrained, technical means such as slotting and reinforced heat exchange cannot be applied, and the heat exchange efficiency of the finned tube is low.
Disclosure of Invention
The invention aims to overcome the defects and provides a single-row tube of an air-cooling condenser, which can enhance the external pressure bearing capacity of a base tube, reduce the consumption of fin materials and improve the heat exchange efficiency.
The purpose of the invention is realized as follows:
a single-row tube of an air-cooled condenser comprises a base tube and a snake-shaped fin, wherein the cross section of the base tube is a flat tube, and the overall dimension of the cross section of the base tube is 175mm in length and 10-15mm in width;
the outer parts of two side surfaces where the long sides of the cross section of the base tube are located are respectively provided with a snake-shaped fin, and the thickness of each snake-shaped fin is 0.1-0.22 mm;
the serpentine fins are discontinuous fins or corrugated fins.
Preferably, the serpentine fins are provided with louver type slots at intervals, and the number of the slots of the louver type slots is more than 2.
Preferably, the slotting inclination angle of the louver type slots is 15-25 degrees.
Preferably, the serpentine fins are provided with bridge piece structure gaps at intervals, and the number of the slots of the bridge piece structure gaps is more than 2.
Preferably, the corrugated height of the corrugated fin is 1.5-2.5 mm.
Preferably, the serpentine fin is made of aluminum or aluminum alloy.
Preferably, the base pipe is made of a bimetal composite material, the outer layer is aluminum or alloy aluminum, and the inner layer is carbon steel or stainless steel.
Preferably, the serpentine fin is connected to the base pipe by brazing.
The invention has the beneficial effects that:
the base pipe is a flat pipe, the cross section of the base pipe has the overall dimension of 175mm in length and 10-15mm in width, the bearing capacity of the base pipe is improved, the stress of external pressure borne by the fins is greatly reduced, the thickness of the fins can be reduced, the fins can be made into corrugated shapes, and can also be made into louver type or bridge piece structures through slotting, so that heat exchange is enhanced, and the heat exchange performance of a single exhaust pipe is improved.
Drawings
Fig. 1 is an overall schematic view of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is a schematic view of a fin of example 1.
Fig. 4 is a plan view of the fin of example 1.
Fig. 5 is a partially enlarged view of fig. 4.
FIG. 6 is a schematic view of a fin of example 2.
Fig. 7 is a top view of a fin of example 2.
FIG. 8 is a schematic view of a fin of example 3.
Fig. 9 is a top view of a fin of example 3.
In the figure: 1. a base pipe; 2. a serpentine fin.
Detailed Description
Example 1:
referring to fig. 1-2, a single-row tube of an air-cooled condenser comprises a base tube 1 and a serpentine fin 2, wherein the cross section of the base tube 1 is a flat tube, and the external dimension of the cross section of the base tube 1 is 175mm in length and 10-15mm in width; the outer parts of two side surfaces where the long sides of the cross section of the base tube 1 are located are respectively provided with a snake-shaped fin 2, and the thickness of each snake-shaped fin 2 is 0.1-0.22 mm; the serpentine fins 2 are discontinuous fins.
The serpentine fin 2 is made of aluminum or aluminum alloy.
The base tube 1 is made of a bimetal composite material, the outer layer is made of aluminum or alloy aluminum, and the inner layer is made of carbon steel or stainless steel.
The serpentine fins 2 are bent in a plurality of serpentines, and the serpentine fins 2 are connected with the base pipe 1 through brazing.
3-5, the serpentine fins 2 are provided with louvered slits at intervals. The number of the slots of the louver type slots is more than 2. The slotting inclination angle a of the louver type slots is 15-25 degrees. And the louver type gaps open the two sides of the vertical surface of the fin.
Example 2:
referring to fig. 6 and 7, the single-row tube of the air-cooling condenser comprises a base tube 1 and a serpentine fin 2, wherein the cross section of the base tube 1 is a flat tube, and the external dimension of the cross section of the base tube 1 is 175mm in length and 10-15mm in width; the outer parts of two side surfaces where the long sides of the cross section of the base tube 1 are located are respectively provided with a snake-shaped fin 2, and the thickness of each snake-shaped fin 2 is 0.1-0.22 mm; the serpentine fins 2 are discontinuous fins.
The serpentine fin 2 is made of aluminum or aluminum alloy.
The base tube 1 is made of a bimetal composite material, the outer layer is made of aluminum or alloy aluminum, and the inner layer is made of carbon steel or stainless steel.
The serpentine fins 2 are bent in a plurality of serpentines, and the serpentine fins 2 are connected with the base pipe 1 through brazing.
As shown in fig. 8 and 9, the serpentine fins 2 are provided with gap of bridge structure at intervals. The bridge structure gaps are arranged on two sides of the vertical surfaces of the fins in a staggered mode, and the number of the slots of the bridge structure gaps is more than 2. The strip seam direction of the bridge piece structure seam is vertical to the air flowing direction, and the number of the seam seams of the bridge piece structure seam is more than 2.
Example 3:
referring to fig. 1-2, a single-row tube of an air-cooled condenser comprises a base tube 1 and a serpentine fin 2, wherein the cross section of the base tube 1 is a flat tube, and the external dimension of the cross section of the base tube 1 is 175mm in length and 10-15mm in width; the outer parts of two side surfaces where the long sides of the cross section of the base tube 1 are located are respectively provided with a snake-shaped fin 2, and the thickness of each snake-shaped fin 2 is 0.1-0.22 mm; the serpentine fins 2 are corrugated fins.
The serpentine fin 2 is made of aluminum or aluminum alloy.
The base tube 1 is made of a bimetal composite material, the outer layer is made of aluminum or alloy aluminum, and the inner layer is made of carbon steel or stainless steel.
The serpentine fins 2 are bent in a plurality of serpentines, and the serpentine fins 2 are connected with the base pipe 1 through brazing.
As shown in fig. 7 and 8, the serpentine fin 2 is provided with continuous heat exchange enhancing corrugations, and the corrugation height of the corrugated fin is 1.5-2.5 mm.
In the embodiment 1-3, the cross section of the base tube 1 is optimized to have the length of 120-175mm and the width of 10-15mm, the capacity of bearing external pressure of the base tube 1 and the finned tube is enhanced, the stress of the serpentine fin 2 is reduced, the influence of the compressive deformation of the base tube 1 on the design optimization of the serpentine fin 2 is greatly reduced, and the following purposes can be realized under the condition:
1. the fins can implement measures such as thickness reduction and the like, so that the cost of the air-cooled condenser is reduced;
2. the fins can implement measures such as slotting reinforced heat exchange and the like, so that the heat exchange performance of the finned tubes is improved.
Comparative example 1:
as in the example, except that the cross-sectional profile of the substrate tube 1 is optimised to have a length of less than 120mm and a width of 10-15 mm. Thus, the resistance of the steam in the base pipe is increased, which causes energy waste and is uneconomical.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides an air cooling condenser list calandria, includes parent tube (1) and snakelike fin (2), parent tube (1) cross section is the pipe of platykurtic, its characterized in that:
the cross section of the base pipe (1) has the external dimension of 120-175mm in length and 10-15mm in width;
the outer parts of two side surfaces of the long side of the cross section of the base tube (1) are respectively provided with a snake-shaped fin (2), and the thickness of the snake-shaped fin (2) is 0.1-0.22 mm;
the serpentine fins (2) are discontinuous fins or corrugated fins.
2. The single row of tubes of an air-cooled condenser of claim 1, wherein: the snakelike fins (2) are provided with louver type gaps at intervals, and the number of the slots of the louver type gaps is more than 2.
3. The single row of tubes of an air-cooled condenser of claim 2, wherein: the slotting inclination angle of the louver type slits is 15-25 degrees.
4. The single row of tubes of an air-cooled condenser of claim 1, wherein: the snakelike fin (2) interval is equipped with the bridge piece structure gap, the number of slotting of bridge piece structure gap is more than 2.
5. The single row of tubes of an air-cooled condenser of claim 1, wherein: the corrugated height of the corrugated fin is 1.5-2.5 mm.
6. The single row of tubes of an air-cooled condenser of claim 1, wherein: the serpentine fin (2) is made of aluminum or alloy aluminum.
7. The single row of tubes of an air-cooled condenser of claim 1, wherein: the base pipe (1) is made of a bimetal composite material, the outer layer is made of aluminum or alloy aluminum, and the inner layer is made of carbon steel or stainless steel.
8. The single row of tubes of an air-cooled condenser of claim 1, wherein: the snake-shaped fin (2) is connected with the base pipe (1) through brazing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010370149.4A CN111504076A (en) | 2020-05-06 | 2020-05-06 | Single-row pipe of air-cooling condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010370149.4A CN111504076A (en) | 2020-05-06 | 2020-05-06 | Single-row pipe of air-cooling condenser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111504076A true CN111504076A (en) | 2020-08-07 |
Family
ID=71874993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010370149.4A Pending CN111504076A (en) | 2020-05-06 | 2020-05-06 | Single-row pipe of air-cooling condenser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111504076A (en) |
-
2020
- 2020-05-06 CN CN202010370149.4A patent/CN111504076A/en active Pending
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