CN212109700U - Spiral flat pipe with wave-shaped outer ribs for heat exchange of high-viscosity fluid - Google Patents
Spiral flat pipe with wave-shaped outer ribs for heat exchange of high-viscosity fluid Download PDFInfo
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- CN212109700U CN212109700U CN202020622621.4U CN202020622621U CN212109700U CN 212109700 U CN212109700 U CN 212109700U CN 202020622621 U CN202020622621 U CN 202020622621U CN 212109700 U CN212109700 U CN 212109700U
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Abstract
The invention discloses a spiral flat tube with wave-shaped outer ribs for heat exchange of high-viscosity fluid, which comprises a spiral flat tube body, wherein continuous wave-shaped outer ribs are arranged outside the spiral flat tube body, the wave-shaped outer ribs are spirally arranged along the tube axis direction of the spiral flat tube body, the spiral flat tube body and the wave-shaped outer ribs are formed in one step by mechanical rolling, two ends of the spiral flat tube body are respectively provided with a round tube communicated with the inside of the spiral flat tube body, the wave-shaped outer ribs are of a two-dimensional structure, and the surfaces of the outer ribs are smooth. The invention can improve the heat transfer coefficient of convection outside the pipe, and can ensure small fluid flow resistance while destroying the fluid flow boundary, and is particularly suitable for the heating and cooling heat exchange process of high-viscosity fluid such as crude oil, heavy oil, naphtha and resin.
Description
Technical Field
The invention relates to the technical field of petroleum and chemical heat exchange, in particular to a spiral flat pipe with wavy outer ribs for heat exchange of high-viscosity fluid.
Background
Heat transfer by high viscosity fluids is widely used in various industrial processes such as food, light industry, power, petroleum, refrigeration, machinery, marine and the like. Sterilizing high viscosity food; cooling lubricating oil of various mechanical transmission equipment; removing heat in a reaction kettle in the polymerization reaction; heating or cooling of various high viscosity raw materials and finished products in petrochemical industry. These processes all involve the exchange of heat, and therefore the importance of heat transfer by high viscosity fluids in industrial processes is undoubted. However, the high-viscosity fluid has the disadvantages of low heat transfer coefficient and large pressure drop in the process of enhancing heat transfer. Therefore, how to increase the heat transfer coefficient of the high-viscosity fluid and reduce the pressure drop becomes a key and difficult problem in the heat transfer field at present.
In order to enhance the heat transfer of high viscosity fluids, the main methods at present are to modify the surface structure of the pipe, to add inserts of various structures into the pipe, and the like. Such as corrugated tubing, spiral fluted tubing, crater tubing, and spiral flat tubing for high viscosity fluids. However, the current method, namely, the optimization of parameters and structure on the basis of the existing pipe type, still cannot effectively solve the problems of low heat exchange coefficient and large pressure drop. The composite enhanced heat transfer technology is to adopt two or more enhanced heat transfer measures simultaneously to exert respective advantages so as to obtain better enhanced heat transfer effect. On one hand, although the reinforced heat transfer pipe (such as a spiral corrugated pipe, a spiral flat pipe and a zoom pipe) with a simple rough rib surface cannot cause the sharp increase of fluid pressure drop, the disturbance degree of the reinforced heat transfer pipe on a fluid boundary layer is not high, and the heat transfer performance is not obviously improved. On the other hand, the use of various finned tubes (e.g., low finned tube, zigzag finned tube, petal-shaped finned tube, etc.) having a high degree of fluid turbulence can greatly improve the heat transfer performance of the fluid, but also causes a sharp increase in pressure drop.
The Chinese utility model patent CN201420227693.3 discloses a discontinuous bidirectional twisted heat exchange tube, which comprises a twisted section and a first straight tube and a second straight tube at two ends of the twisted section, wherein the twisted section is composed of a plurality of units, a third straight tube is arranged between two adjacent units, each unit comprises a left twisted tube section, a straight tube section and a right twisted tube section, and the structure of the invention is fundamentally different from that of the invention; the chinese utility model CN200620092685.8 discloses a spiral grooved flat tube, which is a grooved spiral flat tube, and is fundamentally different from the present invention in structure. The invention relates to a method for manufacturing a metal spiral corrugated flat pipe, which is characterized in that band-shaped thin steel is subjected to corrugating, folding and meshing edges, pipe coiling and edge pressing to manufacture a metal spiral corrugated round pipe, and then the metal spiral corrugated flat pipe is flattened and formed.
Disclosure of Invention
The technical problem to be solved by the invention is to solve the problems of unobvious improvement of the heat exchange coefficient of the shell side or flow resistance in the prior art
The spiral flat pipe has the defects of sharp increase and the like, and the corrugated outer rib is arranged outside the pipe of the spiral flat pipe body, so that the heat transfer coefficient outside the pipe is improved obviously, and the small fluid flow resistance is ensured.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a spiral flat pipe that is used for high viscosity fluid heat transfer and takes wave outer rib, includes the spiral flat body, the outside of tubes of spiral flat body is equipped with continuous wave outer rib, the wave outer rib is the heliciform along the hollow shaft direction of spiral flat body and arranges, and adopts mechanical roll extrusion one shot forming between spiral flat body and the wave outer rib, the both ends of spiral flat body respectively are equipped with a pipe that is linked together with spiral flat body is inside, the wave outer rib is two-dimensional structure, wave outer rib surface is smooth.
In one embodiment, the cross-section of the spiral flat tube body is elliptical.
In one embodiment, the width of the wave crest and the wave trough of the wavy outer rib is 1 mm-3 mm;
the vertical distance from the wave crest of the wave-shaped outer rib to the wave trough is 0.5 mm-2.0 mm.
In one embodiment, the spiral flat tube with the wavy outer ribs for heat exchange of high-viscosity fluid is applied to a heat and mass transfer device, and the heat and mass transfer device is a heater or a cooler.
In one embodiment, the high viscosity fluid is a fluid having a viscosity greater than 10 centipoise.
In one embodiment, the high viscosity fluid is crude oil, or heavy oil, or naphtha, or resin.
The invention has the advantages and beneficial effects that:
the invention can improve the heat transfer coefficient of convection outside the pipe, and can ensure small resistance of fluid flow while destroying the flowing boundary of the fluid, thus being especially suitable for high-viscosity fluid.
(1) Heat exchange process for high viscosity fluids: the corrugated outer ribs are arranged outside the spiral flat pipe body, so that the heat transfer performance of the heat exchanger is improved, and compared with a common spiral flat pipe, the spiral flat pipe body can improve the convection heat transfer coefficient outside the pipe by more than 100%; the wavy outer ribs periodically destroy the heat transfer and flow boundary layers established on the surfaces of the spiral flat tube bodies by the fluid, and the thickness of the heat transfer detention layer of the fluid is reduced.
(2) The spiral flat pipe body and the wave-shaped outer ribs are formed in one step by mechanical rolling, the structure is simple, the manufacturing cost is low, no cutting to materials exists in the processing process, and the material utilization rate is high.
(3) The wavy outer ribs periodically destroy the fluid flow boundary layer, and the disturbance effect on the heat exchange fluid is enhanced, so that the fluid can achieve full turbulence under an extremely low Reynolds number.
(4) Compared with other finned tubes (such as a sawtooth finned tube, a petal-shaped finned tube and a T-shaped finned tube): compared with other finned tubes, the wavy outer rib structure of the invention is smoother, has smaller resistance to fluid flow and lower pressure drop, is particularly suitable for heating and cooling heat exchange processes of high-viscosity fluids such as crude oil, heavy oil, naphtha and resin, and can greatly improve the heat transfer performance of the high-viscosity fluids such as crude oil, heavy oil, slag, naphtha and resin.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a sectional view a-a in fig. 1.
Fig. 3 is a sectional view taken along line B-B in fig. 1.
Fig. 4 is an enlarged view of a portion C in fig. 1.
Detailed Description
In order to facilitate an understanding of the invention, a full description thereof will be given below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
Referring to fig. 1 to 4, a spiral flat tube with corrugated outer ribs for heat exchange of high-viscosity fluid includes a spiral flat tube body 1, continuous corrugated outer ribs 2 are disposed outside the spiral flat tube body 1, the corrugated outer ribs 2 are spirally arranged along a tube axis direction of the spiral flat tube body 1, and a mechanical rolling process is adopted between the spiral flat tube body 1 and the corrugated outer ribs 2. Two ends of the spiral flat tube body 1 are respectively provided with a round tube 3 communicated with the inside of the spiral flat tube body 1. The wave-shaped outer rib 2 is of a two-dimensional structure, and the surface of the wave-shaped outer rib 2 is smooth.
Wherein, the cross section of the spiral flat pipe body 1 is oval.
Specifically, the width of the wave crest 4 and the wave trough 5 of the wave-shaped outer rib 2 are both 1 mm. The vertical distance from the wave crest 4 of the wave-shaped outer rib 2 to the wave trough 5 thereof is 0.5 mm.
The present embodiment 1 is applied to a heater. The high viscosity fluid of this example 1 was crude oil.
Example 2
Referring to fig. 1 to 4, a spiral flat tube with corrugated outer ribs for heat exchange of high-viscosity fluid includes a spiral flat tube body 1, continuous corrugated outer ribs 2 are disposed outside the spiral flat tube body 1, the corrugated outer ribs 2 are spirally arranged along a tube axis direction of the spiral flat tube body 1, and a mechanical rolling process is adopted between the spiral flat tube body 1 and the corrugated outer ribs 2. Two ends of the spiral flat tube body 1 are respectively provided with a round tube 3 communicated with the inside of the spiral flat tube body 1. The wave-shaped outer rib 2 is of a two-dimensional structure, and the surface of the wave-shaped outer rib 2 is smooth.
Wherein, the cross section of the spiral flat pipe body 1 is oval.
Specifically, the width of the wave crest 4 and the wave trough 5 of the wave-shaped outer rib 2 are both 3 mm. The vertical distance from the wave crest 4 of the wave-shaped outer rib 2 to the wave trough 5 thereof is 2 mm.
This embodiment 2 is applied to a heater. The high viscosity fluid of this example 2 is crude oil.
It should be noted that: in other embodiments, the high viscosity fluid may also be heavy oil, or naphtha, or resin.
The working principle and the working process of the invention are as follows:
the spiral flat pipe body is suitable for the enhanced heat transfer of fluid with high Prandtl number and low Reynolds number, and meanwhile, the spiral flat pipe body 1 can be mutually supported in a spiral line point contact mode, so that the good anti-seismic effect is achieved, and the shell-side pressure drop can be reduced. The wave-shaped outer ribs 2 of the invention have smooth surfaces, and the periodic change of the wave crests 4 and the wave troughs 5 is utilized to lead the boundary layer of the fluid to be in the process of establishing and destroying repeatedly, thus forming the instability of the bottom layer of the boundary layer, greatly improving the convection heat transfer coefficient between the fluid and the wall surface, and not obviously increasing the flow resistance of the fluid.
The invention has the advantages and beneficial effects that:
the invention can improve the heat transfer coefficient of convection outside the pipe, and can ensure small resistance of fluid flow while destroying the flowing boundary of the fluid, thus being especially suitable for high-viscosity fluid.
(1) Heat exchange process for high viscosity fluids: the corrugated outer ribs are arranged outside the spiral flat pipe body, so that the heat transfer performance of the heat exchanger is improved, and compared with a common spiral flat pipe, the spiral flat pipe body can improve the convection heat transfer coefficient outside the pipe by more than 100%; the wavy outer ribs periodically destroy the heat transfer and flow boundary layers established on the surfaces of the spiral flat tube bodies by the fluid, and the thickness of the heat transfer detention layer of the fluid is reduced.
(2) The spiral flat pipe body and the wave-shaped outer ribs are formed in one step by mechanical rolling, the structure is simple, the manufacturing cost is low, no cutting to materials exists in the processing process, and the material utilization rate is high.
(3) The wavy outer ribs periodically destroy the fluid flow boundary layer, and the disturbance effect on the heat exchange fluid is enhanced, so that the fluid can achieve full turbulence under an extremely low Reynolds number.
(4) Compared with other finned tubes (such as a sawtooth finned tube, a petal-shaped finned tube and a T-shaped finned tube): compared with other finned tubes, the wavy outer rib structure of the invention is smoother, has smaller resistance to fluid flow and lower pressure drop, is particularly suitable for heating and cooling heat exchange processes of high-viscosity fluids such as crude oil, heavy oil, naphtha and resin, and can greatly improve the heat transfer performance of the high-viscosity fluids such as crude oil, heavy oil, slag, naphtha and resin.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. The utility model provides a spiral flat pipe that is used for high viscosity fluid heat transfer and takes wave outer rib, a serial communication port, including the spiral flat body, the outside of tubes of spiral flat body is equipped with continuous wave outer rib, wave outer rib is the heliciform along the hollow shaft direction of spiral flat body and arranges, and adopts mechanical roll extrusion one shot forming between spiral flat body and the wave outer rib, the both ends of spiral flat body respectively are equipped with a pipe that is linked together with spiral flat body is inside, wave outer rib is two-dimensional structure, wave outer rib surface is smooth.
2. The helical flat tube with corrugated outer ribs for heat exchange of high viscosity fluids as claimed in claim 1, wherein the cross section of the helical flat tube body is elliptical.
3. The spiral flat tube with the wavy outer ribs for heat exchange of high-viscosity fluids as claimed in claim 1, wherein the width of the wave crests and the wave troughs of the wavy outer ribs is 1 mm-3 mm;
the vertical distance from the wave crest of the wave-shaped outer rib to the wave trough is 0.5 mm-2.0 mm.
4. The spiral flat tube with corrugated outer ribs for heat exchange of high-viscosity fluid according to claim 1, wherein the spiral flat tube with corrugated outer ribs for heat exchange of high-viscosity fluid is applied to a heat and mass transfer device, and the heat and mass transfer device is a heater or a cooler.
5. The helical flat tube with corrugated outer ribs for heat exchange of high viscosity fluids as claimed in claim 1, wherein the high viscosity fluid is a fluid having a viscosity of greater than 10 centipoise.
6. The helical flat tube with corrugated outer ribs for heat exchange of high viscosity fluid as claimed in claim 5, wherein the high viscosity fluid is crude oil, or heavy oil, or naphtha, or resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020622621.4U CN212109700U (en) | 2020-04-23 | 2020-04-23 | Spiral flat pipe with wave-shaped outer ribs for heat exchange of high-viscosity fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020622621.4U CN212109700U (en) | 2020-04-23 | 2020-04-23 | Spiral flat pipe with wave-shaped outer ribs for heat exchange of high-viscosity fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212109700U true CN212109700U (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020622621.4U Active CN212109700U (en) | 2020-04-23 | 2020-04-23 | Spiral flat pipe with wave-shaped outer ribs for heat exchange of high-viscosity fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212109700U (en) |
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2020
- 2020-04-23 CN CN202020622621.4U patent/CN212109700U/en active Active
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| GR01 | Patent grant | ||
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Effective date of registration: 20220902 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: YUEYANG CHANGLING EQUIPMENT RESEARCH INSTITUTE Co.,Ltd. Patentee after: HUNAN HERAN EQUIPMENT ENGINEERING TECHNOLOGY Co.,Ltd. Address before: 414000 Hunan province Yueyang Changlian District of Yunxi City Patentee before: CHANGLING BRANCH, CHINA PETROLEUM CHEMICAL Corp. Patentee before: YUEYANG CHANGLING EQUIPMENT RESEARCH INSTITUTE Co.,Ltd. Patentee before: HUNAN HERAN EQUIPMENT ENGINEERING TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230516 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: CHANGLING BRANCH, CHINA PETROLEUM CHEMICAL Corp. Patentee after: YUEYANG CHANGLING EQUIPMENT RESEARCH INSTITUTE Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: YUEYANG CHANGLING EQUIPMENT RESEARCH INSTITUTE Co.,Ltd. Patentee before: HUNAN HERAN EQUIPMENT ENGINEERING TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |