CN109185857A - Water screen tube fin and its processing and working method with buffering thermal stress and raising heat exchange efficiency - Google Patents
Water screen tube fin and its processing and working method with buffering thermal stress and raising heat exchange efficiency Download PDFInfo
- Publication number
- CN109185857A CN109185857A CN201810941643.4A CN201810941643A CN109185857A CN 109185857 A CN109185857 A CN 109185857A CN 201810941643 A CN201810941643 A CN 201810941643A CN 109185857 A CN109185857 A CN 109185857A
- Authority
- CN
- China
- Prior art keywords
- fin
- circular arc
- water screen
- screen tube
- heat exchange
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/101—Tubes having fins or ribs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
-
- 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
- F28F1/14—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 and extending longitudinally
- F28F1/22—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 and extending longitudinally the means having portions engaging further tubular elements
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/06—Fastening; Joining by welding
Abstract
The present invention relates to a kind of water screen tube fin with buffering thermal stress and raising heat exchange efficiency and its processing and working methods.Currently, fin is parallel between being mostly two water screen tubes with the form that water screen tube connects to be welded with fin, fin is in line-styled.This arrangement easily forms booster, and influences heat exchange efficiency.The present invention includes No.1 water screen tube, No. two water screen tubes, No.1 circular arc fin and No. two circular arc fins, the side of No.1 circular arc fin is connect with the side of No. two circular arc fins, the other side of No.1 circular arc fin is connect with No.1 water screen tube, and the other side of No. two circular arc fins is connect with No. two water screen tubes；No.1 circular arc fin and No. two circular arc fins are arcuate structure, No.1 circular arc fin and No. two circular arc fin Opposite direction connections, and No.1 circular arc fin and No. two circular arc fins are connected to form the S type fin of " S " type structure.Invention increases scope of thermal expansion and heat exchange area, reduce thermal stress, improve heat exchange efficiency.
Description
Technical field
The present invention relates to a kind of water screen tube fin with buffering thermal stress and raising heat exchange efficiency and its processing and works
Make method, is widely used in station boiler field.
Background technique
In order to improve coal-fired power station boiler heat exchange efficiency, saving fuel is used, and improves power generation field economic benefit,
In the manufacture of large medium-size boiler furnace wall cooling, the form for mostly using fin to connect with water screen tube greatly is arranged.This arrangement is most
For H-type structure, i.e. it is welded with fin in parallel between two water screen tubes, fin is in line-styled, such as application number in terms of axial end face
For 201721833814.9 Chinese patent.In actual operation, when Combustion Operation of Boilers changes greatly, temperature deviation with it is swollen
The swollen unsmooth larger thermal stress of generation at fin and water screen tube solder design, easily causes water screen tube and fin weld seam to draw
It splits, forms booster.In addition, during water screen tube and fin actual welding, since welding personnel weld horizontal is not high, weld seam matter
Measure it is low reduce weld strength, undoubtedly encouraged Waterwall tube failure leakage generation.Meanwhile adjacent two water screen tubes spacing is small,
Above-mentioned arrangement heat exchange area is smaller, influences heat exchange efficiency.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and providing a kind of design reasonably has
The water screen tube fin and its processing and working method for buffering thermal stress and improving heat exchange efficiency, increase scope of thermal expansion and change
Heat area reduces thermal stress, improves heat exchange efficiency.
Technical solution used by the present invention solves the above problems is: one kind having buffering thermal stress and improves heat exchange efficiency
Water screen tube fin, including No.1 water screen tube and No. two water screen tubes；It is characterized in that, further include No.1 circular arc fin and
The side of No. two circular arc fins, the No.1 circular arc fin is connect with the side of No. two circular arc fins, the No.1 circular arc fin
The other side connect with No.1 water screen tube, the other side of No. two circular arc fins is connect with No. two water screen tubes；Described one
Number circular arc fin and No. two circular arc fins are arcuate structure, the No.1 circular arc fin and No. two circular arc fin Opposite direction connections,
The No.1 circular arc fin and No. two circular arc fins are connected to form the S type fin of " S " type structure.
Furthermore, the No.1 circular arc fin and No. two circular arc fins are fixed on No.1 water screen tube respectively in axial direction
On the outer wall of No. two water screen tubes, the No.1 circular arc fin, No. two circular arc fins, No.1 water screen tube and No. two water-cooling walls
The length of pipe is identical.
Furthermore, the No.1 water screen tube, S type fin and No. two water screen tubes are alternately arranged；Multiple No.1 water
In cold wall pipe and No. two water screen tubes, a S type fin is arranged between each No.1 water screen tube and No. two water screen tubes.
Furthermore, the material of the No.1 water screen tube and No. two water screen tubes be SA-210C, specification be Φ 70 ×
8.1mm。
Furthermore, the material of the No.1 circular arc fin and No. two circular arc fins is 12Cr1MoV.
Furthermore, the No.1 circular arc fin and No. two circular arc fin structures are identical, the No.1 circular arc fin and
The inside radius of No. two circular arc fins is 65mm, and outer radius is 71 mm, with a thickness of 6mm.
A kind of processing method of the water screen tube fin as described above that there is buffering thermal stress and improve heat exchange efficiency,
It is characterized in that, the processing method is as follows: respectively radially by the side of No.1 circular arc fin and the side of No. two circular arc fins
45 ° of grooves are made a call in the two sides of end face, later adopt the side of the side of No.1 circular arc fin and No. two circular arc fins at groove
Welded with the mode of two-sided docking, obtain S type fin, by S type fin respectively with No.1 water screen tube and No. two water screen tubes
Outer wall welding, so that the symmetrical centre point of the intersection point and S type fin of S type fin and No.1 water screen tube and No. two water screen tubes
On same straight line, distance is 200mm between S type fin and No.1 water screen tube and the intersection point of No. two water screen tubes.
Furthermore, the intersection point and No.1 circular arc fin of S type fin and No.1 water screen tube and No. two water screen tubes or
The tangent line of No. two circular arc fins is in 45° angle, is formed using the type fin end face two sides S and No.1 water screen tube or No. two water screen tubes
Angle carry out two-sided welding.
Furthermore, two radial end face of S type fin is vertical with the tangent line at the top of end arc.
A kind of working method of the water screen tube fin as described above that there is buffering thermal stress and improve heat exchange efficiency,
Be characterized in that, the working method is as follows: when the variation of boiler furnace thermic load, S type fin passes through perpendicular to wall-cooling surface side
To expansion discharge thermal stress, prevent weld seam from cracking because pulling force is excessive, cause water screen tube explosion leakage；Meanwhile S type fin
Piece increases heat exchange area, improves heat exchange compared to line-styled fin in the case where adjacent water screen tube spacing is certain
Efficiency.
Compared with prior art, the present invention having the following advantages that and effect: the fin between adjacent water screen tube is S-type, bent
Type structure is conducive to absorbing thermal expansion amount compared to original linear structure, reduces fin and water screen tube weld seam pulling force；Meanwhile increasing
Big heat exchange area improves heat exchange efficiency.Furthermore the advantages of it is simple to have both structure, is conducive to processing, can be improved the peace of station boiler
Full property and economy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
In figure: 1, No. two circular arc fin 2 of No.1 circular arc fin, No.1 water screen tube 3, No. two water screen tubes 4, No.1 fillet welding
Stitch 5, two bugle weld seams 6, butt weld 7.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, a kind of water screen tube fin with buffering thermal stress and raising heat exchange efficiency, including No.1 water-cooling wall
Pipe 3 and No. two water screen tubes 4；It further include No.1 circular arc fin 1 and No. two circular arc fins 2, the side of the No.1 circular arc fin 1
It being connect with the side of No. two circular arc fins 2, the other side of the No.1 circular arc fin 1 is connect with No.1 water screen tube 3, and described two
The other side of number circular arc fin 2 is connect with No. two water screen tubes 4；The No.1 circular arc fin 1 and No. two circular arc fins 2 are arc
Shape structure, the No.1 circular arc fin 1 and No. two 2 Opposite direction connections of circular arc fin, the No.1 circular arc fin 1 and No. two circular arc fins
Piece 2 is connected to form the S type fin of " S " type structure.
In the present embodiment, the No.1 circular arc fin 1 and No. two circular arc fins 2 are fixed on No.1 water-cooling wall respectively in axial direction
On the outer wall of pipe 3 and No. two water screen tubes 4, the No.1 circular arc fin 1, No. two circular arc fin 2, No.1 water screen tube 3 and two
The length of number water screen tube 4 is identical.
In the present embodiment, the No.1 water screen tube 3, S type fin and No. two water screen tubes 4 are alternately arranged；Multiple No.1s
In water screen tube 3 and No. two water screen tubes 4, a S is arranged between each No.1 water screen tube 3 and No. two water screen tubes 4
Type fin.
In the present embodiment, the material of the No.1 water screen tube 3 and No. two water screen tubes 4 is SA-210C, and specification is Φ 70
×8.1mm。
In the present embodiment, the material of the No.1 circular arc fin 1 and No. two circular arc fins 2 is 12Cr1MoV.
In the present embodiment, the No.1 circular arc fin 1 is identical with No. two 2 structures of circular arc fin, the No.1 circular arc fin 1
Inside radius with No. two circular arc fins 2 is 65mm, and outer radius is 71 mm, with a thickness of 6mm.
Above-mentioned has buffering thermal stress and the processing method for the water screen tube fin for improving heat exchange efficiency as follows:
Water screen tube fin with buffering thermal stress and raising heat exchange efficiency, including size and thickness No.1 circular arc all the same
Fin 1 and No. two circular arc fins 2, fin material are 12Cr1MoV, and length 800mm, fin chord length is 96mm, with a thickness of 6mm.
By No.1 circular arc fin 1 and No. two circular arc fins 2, reversely docking carries out two-sided welding, and weld seam is butt weld 7, right before welding
Socket part position is two-sided to make a call to 45 ° of grooves, and postwelding No.1 circular arc fin 1 and No. two circular arc fins 2 are centrosymmetric structure, from axial end face
See that S type fin two-end-point and symmetrical centre point are in straight line, and distance is 190mm between endpoint in " S " type.Selection material is SA-
The No.1 water screen tube 3 of 201C and No. two water screen tubes 4, specification are 70 × 8.1mm of Φ, length 800mm, fixed No.1 water
Cold wall pipe 3 and No. two water screen tubes 4, so that plane of its composition is rectangle, No.1 water screen tube 3 and No. two water screen tubes 4
Distance of center circle is 270mm.S type fin molding after butt welding is placed between No.1 water screen tube 3 and No. two water screen tubes 4, S
Type fin radial direction both ends of the surface are completely coincident with two water screen tubes, outer arc end face line and No.1 water screen tube 3 and No. two water-cooling walls
The outer wall of pipe 4 contacts, and when welding forms nature groove, is handled using two-sided welding mode, and S type fin both ends are respectively with one
No.1 fillet weld 5 and two bugle weld seams 6 are formed number between water screen tube 3 and No. two water screen tubes 4.In large medium-size boiler water-cooling wall system
When making, alternately welding is carried out to water screen tube and S type fin by the requirement.
In the present embodiment, the intersection point and No.1 circular arc fin 1 of S type fin and No.1 water screen tube 3 and No. two water screen tubes 4
Or the tangent line of No. two circular arc fins 2 is in 45° angle, utilizes the type fin end face two sides S and No.1 water screen tube 3 or No. two water screen tubes
4 angles formed carry out two-sided welding.
Above-mentioned has buffering thermal stress and the working method for the water screen tube fin for improving heat exchange efficiency as follows: working as boiler
When furnace load changes, S type fin discharges thermal stress by the expansion perpendicular to wall-cooling surface direction, prevents weld seam because of pulling force
It is excessive to crack, cause water screen tube explosion leakage；Meanwhile in the case where adjacent water screen tube spacing is certain, there is arc
The S type fin of degree increases heat exchange area, improves heat exchange efficiency.
In boiler actual motion, S type fin side affected by hot loading influences, No.1 circular arc fin 1 and No. two circular arc fins 2
Arc radius will increase, and arc top extends to 3, No. two water screen tubes 4 of No.1 water screen tube of two sides, passes through to contract, chord length
Good expansion reduces root run thermal stress caused by temperature change, and playing prevents water screen tube root run because of thermal stress mistake
The accident of drawing crack booster is caused greatly.Meanwhile the arcuate structure of 1, No. two circular arc fin 2 of No.1 circular arc fin, increase heat-transfer surface
Product, improves the thermal efficiency, can play energy-saving effect.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (9)
1. a kind of water screen tube fin with buffering thermal stress and raising heat exchange efficiency, including No.1 water screen tube and No. two water
Cold wall pipe；It is characterized in that, further including No.1 circular arc fin and No. two circular arc fins, the side and two of the No.1 circular arc fin
The side connection of number circular arc fin, the other side of the No.1 circular arc fin are connect with No.1 water screen tube, No. two circular arcs
The other side of fin is connect with No. two water screen tubes；The No.1 circular arc fin and No. two circular arc fins are arcuate structure, institute
No.1 circular arc fin and No. two circular arc fin Opposite direction connections are stated, the No.1 circular arc fin and No. two circular arc fins are connected to be formed
The S type fin of " S " type structure.
2. the water screen tube fin according to claim 1 for having buffering thermal stress and improving heat exchange efficiency, feature exist
It is fixed on No.1 water screen tube and No. two water screen tubes respectively in axial direction in, the No.1 circular arc fin and No. two circular arc fins
On outer wall, the No.1 circular arc fin, No. two circular arc fins, the length of No.1 water screen tube and No. two water screen tubes are identical.
3. the water screen tube fin according to claim 1 for having buffering thermal stress and improving heat exchange efficiency, feature exist
In the No.1 water screen tube, S type fin and No. two water screen tubes are alternately arranged；Multiple No.1 water screen tubes and No. two water coolings
In wall pipe, a S type fin is arranged between each No.1 water screen tube and No. two water screen tubes.
4. the water screen tube fin according to claim 1 for having buffering thermal stress and improving heat exchange efficiency, feature exist
In the material of the No.1 water screen tube and No. two water screen tubes is SA-210C, and specification is 70 × 8.1mm of Φ.
5. the water screen tube fin according to claim 1 for having buffering thermal stress and improving heat exchange efficiency, feature exist
In the material of the No.1 circular arc fin and No. two circular arc fins is 12Cr1MoV.
6. the water screen tube fin according to claim 1 for having buffering thermal stress and improving heat exchange efficiency, feature exist
In, the No.1 circular arc fin and No. two circular arc fin structures are identical, the No.1 circular arc fin and No. two circular arc fins it is interior
Radius is 65mm, and outer radius is 71 mm, with a thickness of 6mm.
7. a kind of water that there is buffering thermal stress and improve heat exchange efficiency as described in any one of claim 1-6 claim
The processing method of cold wall pipe fin, which is characterized in that the processing method is as follows: respectively by the side and two of No.1 circular arc fin
45 ° of grooves are radially made a call in the two sides of end face in the side of number circular arc fin, later by the side of No.1 circular arc fin and No. two circles
The side of arc fin is welded by the way of two-sided docking at groove, obtains S type fin, by S type fin respectively with No.1 water
The outer wall of cold wall pipe and No. two water screen tubes welding, so that the intersection point of S type fin and No.1 water screen tube and No. two water screen tubes
And the symmetrical centre point of S type fin is on same straight line, the friendship of S type fin and No.1 water screen tube and No. two water screen tubes
Distance is 200mm between point.
8. the processing side of the water screen tube fin according to claim 7 that there is buffering thermal stress and improve heat exchange efficiency
Method, which is characterized in that the intersection point and No.1 circular arc fin or No. two circles of S type fin and No.1 water screen tube and No. two water screen tubes
The tangent line of arc fin is in 45° angle, the angle formed using the type fin end face two sides S and No.1 water screen tube or No. two water screen tubes
Carry out two-sided welding.
9. a kind of water that there is buffering thermal stress and improve heat exchange efficiency as described in any one of claim 1-6 claim
The working method of cold wall pipe fin, which is characterized in that the working method is as follows: when the variation of boiler furnace thermic load, S type fin
Piece discharges thermal stress by the expansion perpendicular to wall-cooling surface direction, prevents weld seam from cracking because pulling force is excessive, causes water cooling
Wall pipe explosion leakage；Meanwhile in the case where adjacent water screen tube spacing is certain, the S type fin with radian increases heat exchange
Area improves heat exchange efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810941643.4A CN109185857A (en) | 2018-08-17 | 2018-08-17 | Water screen tube fin and its processing and working method with buffering thermal stress and raising heat exchange efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810941643.4A CN109185857A (en) | 2018-08-17 | 2018-08-17 | Water screen tube fin and its processing and working method with buffering thermal stress and raising heat exchange efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109185857A true CN109185857A (en) | 2019-01-11 |
Family
ID=64918226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810941643.4A Pending CN109185857A (en) | 2018-08-17 | 2018-08-17 | Water screen tube fin and its processing and working method with buffering thermal stress and raising heat exchange efficiency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109185857A (en) |
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|---|---|---|---|---|
| CN2292218Y (en) * | 1997-01-16 | 1998-09-23 | 偰彪 | Vertical oil (gas) combustion three reversal strokes boiler |
| JPH1144401A (en) * | 1997-07-23 | 1999-02-16 | Samson Co Ltd | Boiler with heat absorbing fin intersecting combustion gas flow |
| CN201121993Y (en) * | 2007-10-25 | 2008-09-24 | 金川集团有限公司 | Membrane type water-cooled wall of exhaust-heat boiler |
| CN203036673U (en) * | 2012-12-21 | 2013-07-03 | 河南华润电力首阳山有限公司 | Water cooled wall of boiler |
| CN203037134U (en) * | 2012-08-13 | 2013-07-03 | 池州市九华明坤铝业有限公司 | Radiator heat dissipation fin |
| CN204026637U (en) * | 2014-06-28 | 2014-12-17 | 湘潭锅炉有限责任公司 | A kind of flexible diaphragm type wall |
| CN105737132A (en) * | 2016-03-01 | 2016-07-06 | 重庆大学 | Device used for reducing deformation of membrane type water-cooled wall pipes of supercritical circulating fluidized bed boiler |
| KR101758215B1 (en) * | 2016-12-26 | 2017-07-17 | 주식회사 코렌스 | Wavy fin for EGR cooler |
| CN107916984A (en) * | 2017-11-24 | 2018-04-17 | 山东同创汽车散热装置股份有限公司 | A kind of charge air cooler inner fin |
| CN207569850U (en) * | 2017-11-21 | 2018-07-03 | 宁波和盛达能源科技有限公司 | A kind of heat-transfer surface of Novel waste heat boiler |
| CN208983314U (en) * | 2018-08-17 | 2019-06-14 | 华电电力科学研究院有限公司 | Water screen tube fin with buffering thermal stress and raising heat exchange efficiency |
-
2018
- 2018-08-17 CN CN201810941643.4A patent/CN109185857A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2292218Y (en) * | 1997-01-16 | 1998-09-23 | 偰彪 | Vertical oil (gas) combustion three reversal strokes boiler |
| JPH1144401A (en) * | 1997-07-23 | 1999-02-16 | Samson Co Ltd | Boiler with heat absorbing fin intersecting combustion gas flow |
| CN201121993Y (en) * | 2007-10-25 | 2008-09-24 | 金川集团有限公司 | Membrane type water-cooled wall of exhaust-heat boiler |
| CN203037134U (en) * | 2012-08-13 | 2013-07-03 | 池州市九华明坤铝业有限公司 | Radiator heat dissipation fin |
| CN203036673U (en) * | 2012-12-21 | 2013-07-03 | 河南华润电力首阳山有限公司 | Water cooled wall of boiler |
| CN204026637U (en) * | 2014-06-28 | 2014-12-17 | 湘潭锅炉有限责任公司 | A kind of flexible diaphragm type wall |
| CN105737132A (en) * | 2016-03-01 | 2016-07-06 | 重庆大学 | Device used for reducing deformation of membrane type water-cooled wall pipes of supercritical circulating fluidized bed boiler |
| KR101758215B1 (en) * | 2016-12-26 | 2017-07-17 | 주식회사 코렌스 | Wavy fin for EGR cooler |
| CN207569850U (en) * | 2017-11-21 | 2018-07-03 | 宁波和盛达能源科技有限公司 | A kind of heat-transfer surface of Novel waste heat boiler |
| CN107916984A (en) * | 2017-11-24 | 2018-04-17 | 山东同创汽车散热装置股份有限公司 | A kind of charge air cooler inner fin |
| CN208983314U (en) * | 2018-08-17 | 2019-06-14 | 华电电力科学研究院有限公司 | Water screen tube fin with buffering thermal stress and raising heat exchange efficiency |
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