CN117450815A - Novel reinforced heat exchange high-pressure winding tube type heat exchanger and method - Google Patents
Novel reinforced heat exchange high-pressure winding tube type heat exchanger and method Download PDFInfo
- Publication number
- CN117450815A CN117450815A CN202311533536.5A CN202311533536A CN117450815A CN 117450815 A CN117450815 A CN 117450815A CN 202311533536 A CN202311533536 A CN 202311533536A CN 117450815 A CN117450815 A CN 117450815A
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- Prior art keywords
- tube
- heat exchange
- spiral
- shell
- heat exchanger
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- 238000004804 winding Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000945 filler Substances 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 46
- 230000000694 effects Effects 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (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 novel reinforced heat exchange high-pressure winding tubular heat exchanger and a method, wherein the heat exchanger comprises a shell, a central cylinder is arranged in the shell, a plurality of layers of spiral tube bundles are spirally wound on the outer side of the central cylinder, the spiral tube bundles of adjacent layers are supported and separated by a filler strip, and the winding directions of the spiral tube bundles of adjacent layers are opposite; the outside of the spiral tube bundle is wound with spring wires, and the winding directions of the adjacent spring wires outside the spiral tube bundle are opposite; according to the invention, the heat exchange area is increased by arranging the spring wire outside the spiral tube bundle, so that the heat exchange is enhanced, and the heat exchange is enhanced in detail by adopting other types of threaded tubes.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a novel reinforced heat exchange high-pressure winding tube type heat exchanger and a method.
Background
Heat exchangers are widely used as effective heat exchange components with industrial development. Compared with the conventional shell-and-tube heat exchanger, the winding tube heat exchanger has compact structure, large heat exchange area and wide application range, and has important application in the fields of natural gas liquefaction, low-temperature methanol washing, material cooling in chemical industry, medical industry and the like.
The traditional winding tube type heat exchanger has lower shell side flow heat exchange coefficient and larger heat exchange area if meeting the requirement of engineering heat exchange quantity. On one hand, the processing and manufacturing cost is increased, and on the other hand, the safety operation is also threatened to a certain extent. And the heat exchange tube bundle of the traditional winding tube type heat exchanger is mainly smooth circular tubes, the heat exchange coefficient of the shell side is smaller, if the heat exchange is enhanced by arranging fins on the heat exchange tube bundle or adopting a threaded tube, when the winding tube bundle is screwed, the curvature of the side close to the central cylinder is larger than that of the side far away from the central cylinder, so that the fins are stressed unevenly, and the bearing capacity of the tubes is affected. Meanwhile, because the shell-side flow of the wound tube heat exchanger is quite complex, the heat exchange medium is continuously separated and converged in the gap between the wound tube and the shell, so that the turbulence of the shell-side flow is vigorous. However, when the heat exchange medium flows alternately between the outer walls of the upper and lower tubes adjacent to the same-layer tube-surrounding axis, a certain retention area and vortex with lower flow velocity can appear, especially, a flow-surrounding retention area exists between the same-layer heat exchange tubes adjacent to the same-layer heat exchange tubes, and the flow velocity is much smaller than that of the main flow area between the tube layers, so that the local heat transfer coefficient is small, and the heat exchange effect is poor.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a novel reinforced heat exchange high-pressure winding tube type heat exchanger and a method, which can overcome the defect of lower heat exchange coefficient of the shell side of the traditional winding tube type heat exchanger and perform the heat transfer process of reinforced cold and hot media under the condition of not damaging the strength of a winding tube bundle.
The technical scheme of the invention is as follows:
in a first aspect of the invention, a novel reinforced heat exchange high-pressure winding tube type heat exchanger is provided, which is characterized by comprising a shell, wherein a central cylinder is arranged in the shell, a plurality of layers of spiral tube bundles are spirally wound on the outer side of the central cylinder, the spiral tube bundles of adjacent layers are supported and separated by a filler strip, and the winding directions of the spiral tube bundles of the adjacent layers are opposite; the outside winding spring wire of spiral tube bank is opposite with the winding direction of the adjacent spring wire in the outside of layer spiral tube bank.
In some embodiments of the invention, the spring wire has a diameter of 0.5-1mm and a winding angle of 15 ° -25 °.
In some embodiments of the invention, the winding angle is 18 ° -20 °.
In some embodiments of the present invention, the spring wire and the spiral tube bundle are fixed by welding, and the adjacent welding points are half of the spiral distance of the spiral tube bundle.
In some embodiments of the invention, the central tube and the helical tube bundle are secured at both ends to the tube sheet and are in communication with the central tube aperture and the helical tube bundle aperture provided in the tube sheet.
In some embodiments of the invention, the tube sheet is welded to the shell.
In some embodiments of the invention, the shell is cylindrical, one end of the shell is provided with a tube side fluid inlet, the other end is provided with a tube side fluid outlet, and the side wall of the shell is provided with a shell side fluid inlet and a shell side fluid outlet.
In some embodiments of the invention, the spiral tube bundle adopts smooth round tubes, and the tube diameter of the spiral tube bundle is 10-12mm.
In some embodiments of the invention, the spring wire is made of 65Mn material.
In a second aspect of the invention, a working method of a novel enhanced heat exchange high-pressure wound tube heat exchanger is provided, comprising the following steps: the shell side fluid enters between the shell and the spiral tube bundle, the tube side fluid enters the spiral tube bundle and the central cylinder, the shell side fluid exchanges heat with the tube side fluid, and the heat exchange is enhanced and disturbed through spring wires outside the spiral tube bundle, so that the shell side heat transfer effect is improved.
One or more of the technical schemes of the invention has the following beneficial effects:
(1) Compared with the reinforced heat exchange by adopting other types of threaded pipes, the novel reinforced heat exchange high-pressure winding pipe type heat exchanger can avoid uneven heating of fins caused by different curvatures of the threaded pipes by means of the expansion characteristics of the springs, and can realize reinforcement of the shell side of the high-pressure winding pipe type heat exchanger on the premise of not influencing the bearing capacity of the threaded pipes.
(2) According to the novel reinforced heat exchange high-pressure winding tube type heat exchanger provided by the invention, the directions of winding spring wires between tube bundles are alternately spiral left and right, so that the disturbance of shell-side fluid is further enhanced, the thickness of a boundary layer is reduced, the heat exchange effect of the shell side is improved, and a retention area and vortex with lower flow velocity can be avoided when the outer walls of the upper tube and the lower tube are in staggered flow. Meanwhile, for the case that the shell side is two-phase flow, the vaporization core can be further enlarged due to the existence of the spring wire, the heat exchange area of the outer side is increased, and the two-phase heat exchange coefficient is improved.
(3) The novel reinforced heat exchange high-pressure winding tube type heat exchanger provided by the invention can improve the heat transfer coefficient of the shell side by 20% -30%, so that the design size of a heat exchange surface is reduced under the condition of meeting design requirements.
Drawings
FIG. 1 is a schematic diagram of a novel enhanced heat exchange high pressure wound tube heat exchanger of the present invention;
FIG. 2 is a schematic view of the structure of the spiral tube bundle of the present invention with spring wires wound around the outside thereof;
FIG. 3 is a schematic diagram of the structure of the spacer of the present invention.
In the figure: 1. a tube side fluid inlet; 2. a tube sheet; 3. a housing; 4. a helical tube bundle; 5. a spring wire; 6. a tube side fluid outlet; 7. a shell side fluid inlet; 8. a filler strip; 9. a central cylinder; 10. shell side fluid outlet.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1
In a typical embodiment of the present invention, a novel enhanced heat exchange high-pressure wound tube heat exchanger is provided, as shown in fig. 1 and 2, and includes a housing 3, a central tube 9 is disposed in the housing 3, the outer side of the central tube 9 is spirally wound with a plurality of spiral tube bundles 4, the spiral tube bundles 4 of adjacent layers are supported and separated by a spacer 8, and the winding directions of the spiral tube bundles 4 of adjacent layers are opposite; the outside winding spring wire 5 of spiral tube bank 4 is opposite with the winding direction of the adjacent spring wire 5 in the outside of layer spiral tube bank, if the odd layer is right-hand spiral, and even layer is left-hand spiral, or the odd layer is left-right spiral, and even layer is right-hand spiral, wherein, on first layer spiral pipe winding and the central section of thick bamboo 9.
In the embodiment, the diameter of the spring wire is 0.5-1mm, the turbulence of the fluid is weak when the diameter is too small, the heat exchange area is small, and a good heat exchange effect cannot be achieved; the diameter is too large to influence the arrangement interval of adjacent layer bundles, and the diameter of the spring wire is limited in the range, so that a good heat exchange effect can be ensured. The winding angle is 15-25 degrees, and further, the optimal winding angle is 18-20 degrees, the flow velocity in the shell is not increased along with the increase of the winding angle, and too large or too small causes smaller vortex-containing area and more dispersed vortex cores, so that the boundary layer disturbance can be enhanced, and the heat transfer performance can be improved. The spiral internal diameter of the spring wire 5 is equivalent to the external diameter of the spiral tube bundle 4, the winding mode of the spring wire is a left-right alternate spiral mode, the winding directions of the adjacent spring wires 5 outside the spiral tube bundle 4 are opposite, the vaporization core can be enlarged by increasing the heat exchange area outside the spring wire 5, the two-phase heat exchange coefficient is improved, the disturbance of shell side fluid can be further enhanced, the boundary layer thickness is thinned, the heat exchange effect of the shell side is improved, and the detention area and vortex with lower flow velocity during the staggered flow between the outer walls of the upper tube and the lower tube can be avoided.
In this embodiment, the spring wire 5 and the spiral tube bundle 4 are fixed by adopting a welding manner, and the adjacent welding points are half of the spiral distance of the spiral tube bundle, specifically, two welding points are arranged around each tube, and are respectively located in front of and behind the pipeline. This arrangement is the minimum weld to meet spring wire fixation requirements.
In the embodiment, the two ends of the central cylinder 9 and the spiral tube bundle 4 are fixed on the tube plate 2, and the tube plate 2 is provided with spiral tube bundle holes and central cylinder holes, and the number and arrangement of the spiral tube bundle holes correspond to those of the spiral tube bundle 4; the tube plate 2 is connected with the spiral tube bundle in an expansion welding mode, the central cylinder 9 and the spiral tube bundle 4 are respectively communicated with a central cylinder hole and a spiral tube bundle hole which are formed in the tube plate, and shell side fluid is split through the tube plate. Further, the tube plate is welded and fixed with the shell.
In this embodiment, the casing 3 is in a cylindrical shape, and is used for sealing the whole casing side fluid area, one end of the casing is provided with a tube side fluid inlet 1, the other end is provided with a tube side fluid outlet 6, and a shell side fluid inlet 7 and a shell side fluid outlet 10 are arranged on the side wall of the casing, so that the tube side fluid and the shell side fluid enter the heat exchanger to exchange heat.
In this embodiment, the spiral tube bundle adopts smooth pipe, the pipe diameter of spiral tube bundle is 10-12mm, and length changes according to the specific design, provides the supporting role for whole spiral tube bundle through the central section of thick bamboo that sets up, and the central section of thick bamboo is hollow structure, inside flow through tube side fluid.
In this embodiment, the spring wire is made of 65Mn material.
In the embodiment, the structure of the filler strips is shown in fig. 3, holes are formed in the middle of each 10mm interval of the filler strips, the aperture is 2mm, and the special-shaped filler strips strengthen disturbance of shell-side fluid; the adjacent layers of filler strips are arranged in a staggered manner, and compared with the aligned arrangement, the turbulent flow area can be effectively increased, so that the forced heat transfer effect is achieved. The packing strips are arranged between adjacent pipe layers to fix the pipe bundles, the number of the packing strips is determined by the diameter of the pipe layers, and when the diameter D of the outer layer of the pipe is less than or equal to 1200mm, the distance between the packing strips on the same layer is 100-150mm; when the diameter D of the outer part of the tube layer is more than 1200mm and less than or equal to 2500mm, the distance between the same layer of filler strips is 150-250mm, and the filler strips separate two adjacent layers of spiral tube bundles by a thickness of one filler strip which is about 4mm.
The working principle of the novel reinforced heat exchange high-pressure winding tube type heat exchanger provided by the embodiment is as follows:
the tube side fluid enters the heat exchanger through the tube side fluid inlet 1, enters the spiral tube bundle 4 under the distribution of the tube plate 2, passes through the heat exchange area, and flows out through the tube side fluid outlet 6.
The shell-side fluid enters a shell-side flow area formed by the tube plate 2, the shell 3, the spiral tube bundle 4, the spring wires 5, the gasket strips 8, the central cylinder 9 and the like through a shell-side fluid inlet 7, exchanges heat with the tube-side fluid, and flows out through a shell-side fluid outlet 10.
When shell side fluid flows through the spring wire outside the spiral tube in the flowing process, disturbance to the shell side fluid is enhanced, the thickness of a boundary layer is reduced, the heat exchange effect of the shell side is improved, meanwhile, the vaporization core can be further increased due to the existence of the spring wire under the condition that the shell side is a two-phase flow, the heat exchange area of the outer side is increased, the two-phase heat exchange coefficient is improved, the requirement of a high-pressure winding tube type heat exchanger can be met, and the pressure bearing capacity of the spiral tube cannot be influenced.
Example 2
In an exemplary embodiment of the present invention, a working method of a novel enhanced heat exchange high-pressure wound tube heat exchanger is provided, including: the shell side fluid enters between the shell and the spiral tube bundle, the tube side fluid enters the spiral tube bundle and the central cylinder, the shell side fluid exchanges heat with the tube side fluid, and the heat exchange is enhanced and disturbed through spring wires outside the spiral tube bundle, so that the shell side heat transfer effect is improved.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. The novel reinforced heat exchange high-pressure winding pipe type heat exchanger is characterized by comprising a shell, wherein a central cylinder is arranged in the shell, a plurality of layers of spiral pipe bundles are spirally wound on the outer side of the central cylinder, the spiral pipe bundles of adjacent layers are supported and separated by a filler strip, and the winding directions of the spiral pipe bundles of the adjacent layers are opposite; the outside winding spring wire of spiral tube bank is opposite with the winding direction of the adjacent spring wire in the outside of layer spiral tube bank.
2. The novel enhanced heat exchange high pressure wound tube heat exchanger of claim 1 wherein the spring wire has a diameter of 0.5-1mm and a winding angle of 15 ° -25 °.
3. The novel enhanced heat exchange high pressure wound tube heat exchanger of claim 1 wherein the winding angle is 18 ° -20 °.
4. The novel enhanced heat exchange high-pressure wound tube heat exchanger according to claim 1, wherein the spring wire and the spiral tube bundle are fixed in a welding mode, and adjacent welding spots are half of the spiral distance of the spiral tube bundle.
5. The novel enhanced heat exchange high-pressure wound tube heat exchanger of claim 1, wherein the two ends of the central tube and the spiral tube bundle are fixed on the tube plate and are communicated with the central tube hole and the spiral tube bundle hole arranged on the tube plate.
6. The novel enhanced heat exchange high pressure wound tube heat exchanger of claim 5 wherein said tube sheet is welded to said housing.
7. The heat exchange enhancement high-pressure wound tube heat exchanger according to claim 5, wherein the shell is in a cylindrical shape, one end of the shell is provided with a tube side fluid inlet, the other end is provided with a tube side fluid outlet, and a shell side fluid inlet and a shell side fluid outlet are arranged on the side wall of the shell.
8. The novel enhanced heat exchange high-pressure wound tube heat exchanger according to claim 1, wherein the spiral tube bundle adopts smooth round tubes, and the tube diameter of the spiral tube bundle is 10-12mm.
9. The novel enhanced heat exchange high-pressure wound tube heat exchanger of claim 1, wherein the spring wire is made of 65Mn material.
10. A method of operating a novel enhanced heat exchange high pressure wound tube heat exchanger as claimed in any one of claims 1 to 9 comprising: the shell side fluid enters between the shell and the spiral tube bundle, the tube side fluid enters the spiral tube bundle and the central cylinder, the shell side fluid exchanges heat with the tube side fluid, and the heat exchange is enhanced and disturbed through spring wires outside the spiral tube bundle, so that the shell side heat transfer effect is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311533536.5A CN117450815A (en) | 2023-11-16 | 2023-11-16 | Novel reinforced heat exchange high-pressure winding tube type heat exchanger and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311533536.5A CN117450815A (en) | 2023-11-16 | 2023-11-16 | Novel reinforced heat exchange high-pressure winding tube type heat exchanger and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117450815A true CN117450815A (en) | 2024-01-26 |
Family
ID=89587367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311533536.5A Pending CN117450815A (en) | 2023-11-16 | 2023-11-16 | Novel reinforced heat exchange high-pressure winding tube type heat exchanger and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117450815A (en) |
-
2023
- 2023-11-16 CN CN202311533536.5A patent/CN117450815A/en active Pending
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