CN201488623U - Reinforced boiling tube with machined porous surface - Google Patents
Reinforced boiling tube with machined porous surface Download PDFInfo
- Publication number
- CN201488623U CN201488623U CN200920193165XU CN200920193165U CN201488623U CN 201488623 U CN201488623 U CN 201488623U CN 200920193165X U CN200920193165X U CN 200920193165XU CN 200920193165 U CN200920193165 U CN 200920193165U CN 201488623 U CN201488623 U CN 201488623U
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- tube
- porous surface
- boiling
- machined
- perforate
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Abstract
The utility model relates to a reinforced boiling tube with a machined porous surface. The reinforced boiling tube comprises a parent tube, and is characterized in that open pores are reserved on a tube wall surface of the parent tube through cold rolling without cutting, wherein the open pores are communicated with each other through grooves to form the reinforced boiling tube with the porous surface. The open pores are reserved on an unfolded surface of the parent tube in matrix ranks, and correspondingly, the grooves are arranged transversally to communicate with the open pores in the matrix ranks. The open pores are elliptic pores. By combining the characteristics of a T finned tube and the porous surface, a porous surface tube is developed for petrochemical enterprises, which has a higher reinforcing boiling heat transfer than that of the T finned tube and pores, communicated with grooves, on tube wall surface; and with the rolling technology of one-step forming, the processing cost is only small part of the cost of sintering the porous surface and equal to that of the T finned tube; and the use is safer.
Description
Technical field
The utility model relates to the heat exchanger tube in a kind of heat exchanger.
Background technology
Porous surface the earliest appears at 1931, Jacob and Fritz have studied surface smoothness to the boiling heat transfer Effect on Performance, discovery obviously is better than optical surface through the surface of blasting treatment with the machining flute surfaces boiling heat transfer with square grid, but can only keep very short time.After the eighties, the unremitting effort through several generations just develops into antipriming pipe technology and the application level of today from the mid-50.Wherein outstanding especially and influential is following several cast: (1) nineteen sixty-eight, U.S. combinating carbide company (UC) takes the lead in succeeding in developing slug type antipriming pipe High Flux Tube.This porous layer thickness is about 0.25mm, and porosity is about 50～65%; (2) 1976 years, the initiative machining porous surface tube Thermoexcel-E of FDAC Cable Co., Ltd (Hitachi); (3) the T type finned tube that occurs in succession subsequently is GAWA-T pipe (1979) and ECR-40 pipe (1980).Test shows, under the identical thermic load of same media, the boiling heat transfer thermal gradient energy of comparing porous surface with smooth surface dwindles several times, even ten times more than.
Domestic since the end of the seventies, Tsing-Hua University, University Of Tianjin, South China Science ﹠ Engineering University, colleges and universities such as University Of Chongqing and some scientific researches and designing unit drop into manpower and materials one after another, have carried out the research and the test of various reinforcement boiling surfaces and have obtained important progress.But the focus of domestic reinforcement boiling surface mainly concentrates in the air conditioner refrigerating field, and other applications relatively seldom.
Sinopec Luoyang Petrochemical engineering company cooperated with the South China Science ﹠ Engineering University in 1992, succeeded in developing to be suitable for the steel T shape finned tube reboiler that petroleum chemical enterprise uses, and was applied in the industrial production, made boiling heat transfer coefficient increase considerably.But, because the rolling groove of T type finned tube is darker, having reduced effective thickness, the situation of national standard often appears not meeting in the tolerance of adding parent tube, makes T type finned tube inhomogeneous wall thickness occur in rolling, brings hidden danger to production, even production accident.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of machined porous surface and strengthens boiling tube, it is in conjunction with the characteristics of T type finned tube and porous surface, develop a kind of porous surface tube that petroleum chemical enterprise is that use, that have a more substantial increase than T type finned tube enhanced boiling heat transfer, tube wall surface forms porous and is communicated with groove that is suitable for, rolling technique by once-forming, make that processing charges only is the part of sintered porous surface pipe, suitable with T shape finned tube, and use safer.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of machined porous surface is strengthened boiling tube, it includes parent tube, it is characterized in that tube wall surface at parent tube does not have that cutting is cold rolling to go out perforate, fluted connection between the perforate forms the reinforcement boiling tube of porous surface.
Preferably, described perforate presents the matrix ranks on the surface that parent tube launches arranges, and accordingly, groove is a lateral arrangement, and the perforate on each row is communicated with.
Preferably, elliptical aperture is adopted in described perforate, and it is 50～100/cm that elliptical aperture is arranged
2
Preferably, described groove cross section main body presents the water droplet shape, forms cambered surface at bottom land.
At last, described porous surface geometric parameter is: the tunnel opening degree at b=0.1～0.4mm, tooth depth h=0.5～1.2mm, tooth pitch tp=1.0～1.8mm, transection slot apart from E=1.0～1.8mm, groove bottom width B=0.4～1.0mm.
Compared with prior art, advantage of the present utility model is: owing to have the highdensity gas storage pit that can realize stable activation, can form a large amount of effective nucleus of boiling, has bigger specific area simultaneously, circulating on heating surface provides effective passage for steam and liquid, vapour-liquid exchange when having improved boiling greatly, can improve the heat transfer coefficient and the thermal efficiency greatly, the machined porous surface is strengthened the milling train of boiling tube, realized a roll forming moulding of long tube, speed is fast, the efficient height, cost only is equivalent to 1/5～1/10 of metal sintering porous surface tube, be applicable to petrochemical industry, the cast of the novel reinforced boiling heat transfer of energy industry, various reboilers so that this cast is combined into reach the heat transfer efficiency height, resistance is low, processing easily, security is good, cost is low, promptly economizes the purpose that can save money again.
Description of drawings
Fig. 1 strengthens the cutaway view of boiling tube for the machined porous surface;
Fig. 2 strengthens the side view of boiling tube for the machined porous surface;
Fig. 3 is the I place enlarged drawing of Fig. 1;
Fig. 4 is the II place enlarged drawing of Fig. 2;
Fig. 5 strengthens the schematic surface of boiling tube for the machined porous surface.
The specific embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
The MH pipe be with 38 (material comprises carbon steel, acid resisting steel and steel alloy) of normally used GB series heat exchanger tube φ 19～φ be parent tube 1, do not have the cold rolling tube wall surface that goes out of cutting and have elliptical aperture 2, elliptical aperture 2 distributions are 50～100/cm
2, have groove 3 between the elliptical aperture 2 and be communicated with, thereby form porous surface tube.Elliptical aperture 2 presents the matrix ranks on the surface that parent tube 1 launches arranges, and accordingly, groove 3 is lateral arrangement, and the elliptical aperture on each row 2 is communicated with.Groove 3 cross section main bodys present the water droplet shape, form cambered surface at bottom land.The porous surface geometric parameter have the tunnel opening degree at b=0.1～0.4mm, tooth depth h=0.5～1.2mm, tooth pitch tp=1.0～1.8mm, transection slot apart from E=1.0～1.8mm, groove bottom width B=0.4～1.0mm α=30～75 °.According to the characteristics of this cast, develop machined porous surface tube mill, realized the rolling one-shot forming of long tube.Shorten rolling time, greatly reduced production cost.
For grasping the heat transfer property of MH pipe, be the laboratory in University Of Tianjin's Thermal Power Engineering, at the MH pipe of the multiple size of carbon steel φ 25, carry out the boiling heat transfer test, test(ing) medium is water and ethanol, and adopts general industry light pipe and T type finned tube to carry out corresponding contrast test, and result of the test confirms:
1.MH strengthening boiling tube (single tube), the machined porous surface is used for water and ethanol, and when having the pond nuclear boiling heat exchange of similar physical property medium, in calorific intensity 5 * 10
3～1.7 * 10
5W/m
2In the scope, its boiling heat transfer coefficient is respectively 2～2.5 times (water) and 2.0～4.0 times (ethanol) of industrial light pipe.Than the alcohol single tube boiling heat transfer of T type finned tube, strengthened 1.5～2.5 more than.
Show 2.MH manage the boiling test result of small-sized 7 pipe staggered tubes bundles, be lower than 2～3 * 10 in calorific intensity
4W/m
2The time, no matter the tube bank of water and ethanol is also higher than single tube boiling heat transfer coefficient, after this then than a little less than the single tube.The influence that explanation MH pipe under the high-heat strength condition is arranged by pipe, a large amount of bubbles that lower floor's pipe produces have interference effect to the boiling heat transfer of upper strata pipe.
3. according to the tube bank boiling heat transfer test data of water and ethanol, drawn the practical correlation that can in certain medium scope, calculate MH antipriming pipe tube bank pond nuclear boiling heat exchange property through regression fit.In the relative error of this correlation about ± 25%.Can use for industrial design.
Show through practical test:
The reboiler that the machined porous surface tube is formed is compared with common light pipe reboiler, and boiling is surveyed heat transfer coefficient and can be improved about more than 1.5 times; Compare with the T type finned tube reboiler that efficient is higher, also can improve more than 50%.If (for example adopt the steam heating) during the governing factor of the non-heat exchanging process of reboiler heat medium, generally can be so that overall heat-transfer coefficient improves more than 35%, save about heat exchange area more than 30%, this machined porous surface is strengthened the milling train of boiling tube, realized a roll forming moulding of long tube, speed is fast, the efficient height, cost only is equivalent to 1/5～1/10 of metal sintering porous surface tube, be applicable to petrochemical industry, the cast of the novel reinforced boiling heat transfer of energy industry, the various reboilers that are combined into this cast, reach the heat transfer efficiency height, resistance is low, processing easily, security is good, cost is low, promptly economizes the purpose that can save money again.
Claims (5)
1. a machined porous surface is strengthened boiling tube, and it includes parent tube, it is characterized in that tube wall surface at parent tube does not have that cutting is cold rolling to go out perforate, and fluted connection between the perforate forms the reinforcement boiling tube of porous surface.
2. machined porous surface according to claim 1 is strengthened boiling tube, it is characterized in that described perforate presents the matrix ranks and arranges on the surface that parent tube launches, and accordingly, groove is a lateral arrangement, and the perforate on each row is communicated with.
3. machined porous surface according to claim 1 and 2 is strengthened boiling tube, it is characterized in that described perforate employing elliptical aperture, and it is 50～100/cm that elliptical aperture is arranged
2
4. machined porous surface according to claim 3 is strengthened boiling tube, it is characterized in that described groove cross section main body presents the water droplet shape, forms cambered surface at bottom land.
5. machined porous surface according to claim 4 is strengthened boiling tube, it is characterized in that described porous surface geometric parameter is: the tunnel opening degree at b=0.1～0.4mm, tooth depth h=0.5～1.2mm, tooth pitch tp=1.0～1.8mm, transection slot apart from E=1.0～1.8mm, groove bottom width B=0.4～1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920193165XU CN201488623U (en) | 2009-08-27 | 2009-08-27 | Reinforced boiling tube with machined porous surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920193165XU CN201488623U (en) | 2009-08-27 | 2009-08-27 | Reinforced boiling tube with machined porous surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201488623U true CN201488623U (en) | 2010-05-26 |
Family
ID=42427498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920193165XU Expired - Fee Related CN201488623U (en) | 2009-08-27 | 2009-08-27 | Reinforced boiling tube with machined porous surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201488623U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822519A (en) * | 2014-02-13 | 2014-05-28 | 中国科学院工程热物理研究所 | Porous surface boiling heat exchange enhancement device and method for manufacturing same |
-
2009
- 2009-08-27 CN CN200920193165XU patent/CN201488623U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822519A (en) * | 2014-02-13 | 2014-05-28 | 中国科学院工程热物理研究所 | Porous surface boiling heat exchange enhancement device and method for manufacturing same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20150827 |
|
| EXPY | Termination of patent right or utility model |