CN110715573A - Heat exchange tube suitable for LNG open rack vaporizer - Google Patents
Heat exchange tube suitable for LNG open rack vaporizer Download PDFInfo
- Publication number
- CN110715573A CN110715573A CN201910968133.0A CN201910968133A CN110715573A CN 110715573 A CN110715573 A CN 110715573A CN 201910968133 A CN201910968133 A CN 201910968133A CN 110715573 A CN110715573 A CN 110715573A
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- China
- Prior art keywords
- heat exchange
- tube
- lng
- exchange tube
- fin
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- Pending
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- 239000006200 vaporizer Substances 0.000 title claims abstract description 27
- 229910000838 Al alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 2
- 239000003949 liquefied natural gas Substances 0.000 abstract description 25
- 238000012546 transfer Methods 0.000 abstract description 10
- 239000013535 sea water Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000008016 vaporization Effects 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009834 vaporization Methods 0.000 abstract description 2
- 239000008358 core component Substances 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000003345 natural gas Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000002309 gasification Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241001312219 Amorphophallus konjac Species 0.000 description 1
- 235000001206 Amorphophallus rivieri Nutrition 0.000 description 1
- 229920002752 Konjac Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 235000010485 konjac Nutrition 0.000 description 1
- 239000000252 konjac Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- 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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
-
- 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
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
- F28F1/422—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element with outside means integral with the tubular element and inside means integral with the tubular element
-
- 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
-
- 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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0061—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for phase-change applications
- F28D2021/0064—Vaporizers, e.g. evaporators
Abstract
The invention discloses a novel heat exchange tube suitable for an LNG open-frame vaporizer, which is a core component on an LNG seawater vaporizer, directly determines the heat exchange effect of the vaporizer, occupies large area and production cost, and belongs to the field of liquefied natural gas vaporization. Compared with the traditional finned tube, the finned tube is characterized in that the heat exchange tube comprises the inner fin and the outer fin, the outer fin greatly increases the heat exchange area, the inner fin not only increases the heat exchange area, but also enhances the disturbance of fluid in the tube, and the heat exchange efficiency is greatly improved by 33.0 percent and 45.5 percent compared with the prior domestic heat exchange tube. Meanwhile, the structure is simple, the manufacturing cost is low, the heat exchange efficiency is high, the phenomenon of heat transfer deterioration caused by the icing of seawater outside the pipe in the using process is greatly reduced, and the device can bear the high pressure of 12MPa, and is safe and reliable.
Description
Technical Field
The invention relates to the field of liquefied natural gas gasification, in particular to a heat exchange tube suitable for an LNG open-frame vaporizer.
Background
As a high-quality clean energy, natural gas is used, and more countries pay attention to the development and utilization of natural gas resources. With the continuous development of economy in China, the demand of energy is continuously increased, and in order to optimize an energy structure and reduce pollution, the natural gas utilization is greatly promoted in China, and the proportion of natural gas in primary energy consumption is estimated to reach 10% in 2020.
Half of natural gas consumed in China comes from imports, so that a plurality of Liquefied Natural Gas (LNG) receiving stations are built in China in coastal provinces, a large amount of LNG is imported from overseas, and the LNG can enter a pipe network for use after being gasified. The LNG vaporizer is a key device of the LNG receiving station, and largely determines the cost of the LNG receiving station. An Open Rack Vaporizer (ORV) is used for a large-scale basic load type vaporizer, can safely operate in a load range of 0-100%, and can remotely adjust the vaporization amount according to the change of requirements. The system has the advantages of low operation cost, easy operation and maintenance and sensitive response to load fluctuation, and is widely used in LNG receiving stations.
The basic unit of the gasifier is a heat transfer pipe, a plurality of heat transfer pipes form a plate-shaped arrangement, two ends of the heat transfer pipe are welded by a gas collecting pipe or a liquid collecting pipe to form a plate-shaped pipe bundle, and then the gasifier is formed by a plurality of plate-shaped pipe bundles. The top of the gasifier is provided with a seawater spraying device, and seawater is sprayed on the outer surface of the plate-type tube bundle and flows from top to bottom under the action of gravity. The LNG flows up the tubes and during the flow the seawater transfers heat to the LNG, heating it and vaporizing it. The heat transfer efficiency of the heat transfer tubes directly determines the gasification capacity and footprint of the gasifier.
At present, ORV is monopolized internationally by Konjac Steel-making KOBELCO and Sumitomo, has high price and long production period, and cannot meet the increasing demand of natural gas in China. Among them, Sumitomo corporation issued patent finned tube for open rack vaporizer (patent publication JPH05164496A) in 1993 specifically discloses the finned tube shape and material used for open rack vaporizers, where the number of outer fins is only 8, which is the first version of the heat exchange tube design. The patent of liquefied natural gas open rack vaporizer (patent publication number JPH08176563A) discloses the specific structural composition and design principle of the open rack vaporizer, and provides the distribution and flow form of LNG and seawater in the use process.
In China, the number of manufacturers for producing ORV is very small, the heat exchange efficiency of the heat exchange tubes is low, the problems of large occupied area, high cost and the like of the gasifier are caused, and the gasification capacity is limited. The seventh two five research institutes of the company of the reworked Chinese ship write a patent of an aluminum alloy finned tube extrusion die for an open frame type gasifier (patent publication No. CN103658216A), which discloses the specific shape of a novel heat exchange tube and designs an aluminum alloy finned tube extrusion die for an open frame type gasifier; gansu blue science petrochemical industry high and new equipments limited write a patent of a high-efficiency star-shaped heat exchange tube for a seawater open rack vaporizer (patent No. CN201903280U), and discloses a high-efficiency heat exchange tube which comprises an external star-shaped fin, an inner tube and a turbulence rod. The heat exchange efficiency of the outer fins of the finned tubes designed by the existing patents in China is not greatly improved, most objects are set as Super-ORV heat exchange tubes, but the heat exchange tubes are limited by the technology, almost all the objects adopted in the LNG receiving station in China are traditional ORV in practice, and therefore the purpose of the invention is to set the objects as the improvement of the efficiency of the traditional ORV heat exchange tubes, so that the heat exchange tubes are generally applied to the LNG receiving station.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a heat exchange tube suitable for an LNG open rack vaporizer.
The heat exchange tube suitable for the LNG open rack vaporizer provided by the invention comprises a tube body,
a plurality of outer fins are arranged on the outer side of the tube body and are distributed on the outer side surface of the tube body along the circumferential direction of the tube body;
the inner wall of the tube body is provided with inner fins.
Preferably, the pipe body is formed by extruding an aluminum alloy material.
Preferably, the inner fin is a longitudinal fin, and the cross section of the inner fin is wavy.
Preferably, the plurality of outer fins are formed to extend outward from the outer side surface of the tube body.
Preferably, the plurality of outer fins are symmetrically distributed about the tube body.
Preferably, the plurality of outer fins are evenly distributed around the outer side of the tube body.
Preferably, the plurality of outer fins includes a first outer fin and a second outer fin, wherein:
at least two first outer fins are arranged and are symmetrically distributed on the outer side surface of the tube body;
the second outer fins are disposed between the circumferentially adjacent first outer fins.
Preferably, the first outer fin has a size larger than that of the second outer fin.
Preferably, the height of the second outer fin is the same as the length of the inner diameter of the tube body.
Preferably, the number of the outer fins is 12.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can improve the heat exchange efficiency of the gasifier, save the occupied area and scale and reduce the production cost;
2. according to the invention, the structure of the traditional ORV heat exchange tube is improved, the shape, the position distribution and the like of the outer fins are included, the heat exchange area of the outer fins is greatly increased, the heat exchange area of the inner fins is increased, the fluid disturbance in the tube is enhanced, and the heat exchange efficiency is greatly improved;
3. the heat exchange tube has the advantages of simple structure, low manufacturing cost and high heat exchange efficiency, greatly reduces the phenomenon of heat transfer deterioration caused by the icing of seawater outside the tube in the using process, can bear the high pressure of 12MPa, and is safe and reliable.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a cross-sectional view of a heat exchange tube suitable for use in an open rack LNG vaporizer.
The figures show that:
pipe body 1
First outer fin 2
Second outer fin 3
Inner fin 4
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, the heat exchange tube suitable for the open rack vaporizer of LNG provided by the present invention is extruded by using an aluminum alloy 6063 material with high thermal conductivity. The heat exchange tubes are preferably of axisymmetric construction. The heat exchange tube comprises a tube body, the tube body comprises an inner fin and an outer fin, the outer fin greatly increases the heat exchange area, the inner fin not only increases the heat exchange area, but also enhances the disturbance of fluid in the tube, the heat exchange efficiency is greatly improved, and compared with the existing heat exchange tube in China, the heat exchange area is improved by 33.0%, and the heat exchange efficiency is improved by 45.5%.
The outer fins are further described below: the outer fin is in the radial shape of star, arranges around the heat exchange tube outer tube is average, and in this embodiment, the outer fin quantity is 12, including two first outer fins and ten second outer fins. The size of two first outer fins is greater than the size of ten second outer fins, and two first outer fins are symmetrically distributed at the heat exchange tube periphery. The ten second outer fins are distributed among the first outer fins along the circumferential direction of the heat exchange tube. The height of the second outer fin is equal to the length of the inner diameter of the heat exchange tube, and the second outer fin is in the form of a straight fin. The density of the outer fins can ensure that the heat exchange area is increased to the maximum extent and the pressure drop is in a controllable range,
the inner finned tube is in the form of longitudinal fins and is wavy. The design of interior fin has not only increased heat transfer area, has strengthened intraductal LNG vortex simultaneously to the heat exchange efficiency and the heat transfer volume of heat exchange tube have been improved.
The high-efficiency heat exchange tube adopts aluminum alloy 6063 with high heat conductivity for extrusion molding, and the finned tube with the length of 6600mm is subjected to experiments and numerical simulation researches, which show that the heat exchange tube which is subjected to extrusion molding can not only bear the high pressure of more than ten megapascals and the low temperature of-196 ℃, but also has the heat exchange effect which is greatly improved compared with light tubes and the prior finned tubes in China.
Compared with the common light pipe, the heat exchange tube of the invention has the heat exchange area 2.58 times that of the light pipe and the heat exchange coefficient 1.95 times that of the light pipe. The numerical simulation verification shows that compared with the domestic ORV finned tube, the heat exchange tube has the heat exchange area 1.33 times that of the common finned tube and the heat exchange coefficient 1.46 times that of the domestic ORV finned tube.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a heat exchange tube suitable for LNG opens rack vaporizer which characterized in that: comprises a pipe body and a plurality of connecting rods,
a plurality of outer fins are arranged on the outer side of the tube body and are distributed on the outer side surface of the tube body along the circumferential direction of the tube body;
the inner wall of the tube body is provided with inner fins.
2. The heat exchange tube for an LNG open-rack vaporizer of claim 1, wherein the tube body is extruded from an aluminum alloy material.
3. The heat exchange tube for an LNG open-rack vaporizer according to claim 1, wherein the inner fin is a longitudinal fin, and the cross section of the inner fin is wavy.
4. The heat exchange tube for an LNG open-rack vaporizer of claim 1, wherein the plurality of outer fins are formed extending outwardly from the outer side of the tube body.
5. The heat exchange tube for an LNG open-rack vaporizer of claim 1, wherein the plurality of outer fins are symmetrically distributed about the tube body.
6. The heat exchange tube for an LNG open-rack vaporizer of claim 1, wherein the plurality of outer fins are evenly distributed around the outside of the tube body.
7. The heat exchange tube for an LNG open-rack vaporizer of claim 1, wherein the plurality of outer fins comprises a first outer fin and a second outer fin, wherein:
at least two first outer fins are arranged and are symmetrically distributed on the outer side surface of the tube body;
the second outer fins are disposed between the circumferentially adjacent first outer fins.
8. The heat exchange tube for an LNG open-rack vaporizer of claim 7, wherein the first outer fin has a size greater than that of the second outer fin.
9. The heat exchange tube for an LNG open-rack vaporizer of claim 7, wherein the second outer fin has the same height as the length of the inner diameter of the tube body.
10. The heat exchange tube for an LNG open-rack vaporizer of claim 1, wherein the number of the outer fins is 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968133.0A CN110715573A (en) | 2019-10-12 | 2019-10-12 | Heat exchange tube suitable for LNG open rack vaporizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968133.0A CN110715573A (en) | 2019-10-12 | 2019-10-12 | Heat exchange tube suitable for LNG open rack vaporizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110715573A true CN110715573A (en) | 2020-01-21 |
Family
ID=69212531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910968133.0A Pending CN110715573A (en) | 2019-10-12 | 2019-10-12 | Heat exchange tube suitable for LNG open rack vaporizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110715573A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202793134U (en) * | 2012-07-30 | 2013-03-13 | 四川空分设备(集团)有限责任公司 | Efficient heat pipe for liquefied natural gas (LNG) vaporizer |
| CN103322625A (en) * | 2013-05-29 | 2013-09-25 | 中国船舶重工集团公司第七二五研究所 | Method for designing single heat exchange fin of liquefied natural gas (LNG) vaporizer |
| CN206206999U (en) * | 2016-08-26 | 2017-05-31 | 江苏中圣压力容器装备制造有限公司 | Open-frame type gasifier with efficient heat-exchanging pipe |
| CN211012611U (en) * | 2019-10-12 | 2020-07-14 | 上海交通大学 | Heat exchange tube suitable for L NG open rack vaporizer |
-
2019
- 2019-10-12 CN CN201910968133.0A patent/CN110715573A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202793134U (en) * | 2012-07-30 | 2013-03-13 | 四川空分设备(集团)有限责任公司 | Efficient heat pipe for liquefied natural gas (LNG) vaporizer |
| CN103322625A (en) * | 2013-05-29 | 2013-09-25 | 中国船舶重工集团公司第七二五研究所 | Method for designing single heat exchange fin of liquefied natural gas (LNG) vaporizer |
| CN206206999U (en) * | 2016-08-26 | 2017-05-31 | 江苏中圣压力容器装备制造有限公司 | Open-frame type gasifier with efficient heat-exchanging pipe |
| CN211012611U (en) * | 2019-10-12 | 2020-07-14 | 上海交通大学 | Heat exchange tube suitable for L NG open rack vaporizer |
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