CN111457763A - Capillary heat exchanger for cooling variable-property fluid - Google Patents
Capillary heat exchanger for cooling variable-property fluid Download PDFInfo
- Publication number
- CN111457763A CN111457763A CN202010445792.9A CN202010445792A CN111457763A CN 111457763 A CN111457763 A CN 111457763A CN 202010445792 A CN202010445792 A CN 202010445792A CN 111457763 A CN111457763 A CN 111457763A
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- Prior art keywords
- heat exchanger
- fluid
- baffle
- tube
- capillary
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- 239000012530 fluid Substances 0.000 title claims abstract description 74
- 238000001816 cooling Methods 0.000 title claims abstract description 11
- 238000012546 transfer Methods 0.000 claims abstract description 38
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000008859 change Effects 0.000 claims description 12
- 239000007769 metal material Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 24
- 238000013461 design Methods 0.000 description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 description 12
- 239000001569 carbon dioxide Substances 0.000 description 12
- 239000000498 cooling water Substances 0.000 description 8
- 230000000704 physical effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- F28D7/16—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 arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
- F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
- F28F2009/224—Longitudinal partitions
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 capillary heat exchanger for cooling a variable property fluid, which comprises: a housing having a first fluid inlet and a first fluid outlet at both ends thereof; the tube box is arranged in the shell, and a second fluid inlet and a second fluid outlet are arranged at two ends of the tube box; a plurality of heat transfer tube bundles disposed within the tube box and in communication with the first fluid inlet and the first fluid outlet; the baffle plates are provided with through holes matched with the arrangement modes of the heat transfer tube bundles, and each baffle plate penetrates through the heat transfer tube bundle through the through holes; and the distance between the baffle plate and the wall of the tube box and the distance between two adjacent baffle plates are gradually reduced and/or the height of the baffle plate is gradually increased along the flowing direction of the fluid in the capillary tube heat exchanger. The capillary heat exchanger for cooling the variable-property fluid improves the performance and the heat transfer capacity of the whole heat exchanger by designing parameters of the cross plate.
Description
Technical Field
The invention relates to the technical field of heat dissipation, in particular to a capillary heat exchanger for cooling a variable property fluid.
Background
The heat exchanger is a universal device for realizing heat exchange between high-temperature fluid and low-temperature fluid, has wide application in the fields of electric power, petroleum, chemical industry and the like, optimizes the structure of the heat exchanger, improves the performance of the heat exchanger, and is greatly helpful for saving energy, reducing energy consumption and reducing cost. The shell-and-tube heat exchanger has the advantages of simple structure, applicability to various complex working conditions and the like, and has wide application in the fields. At present, the design specification standard and the production processing method of the shell-and-tube heat exchanger aiming at the conventional fluid are mature, and the application range is wide. The existing design theory considers that the physical properties of the working medium along the tube side and the shell side of the shell-and-tube heat exchanger are not changed greatly, the normal physical properties can be used as design parameters, and the design theory has better applicability to most of fluids.
With the development of energy power technology, the use of the shell-and-tube heat exchanger is more and more extensive, and in some special application occasions, such as the field of supercritical carbon dioxide power generation, the shell-and-tube heat exchanger as a cooler has the advantages of simple process, high compactness and low cost. The high-temperature fluid supercritical carbon dioxide flows at the tube side, and the low-temperature fluid cooling water flows at the shell side, so that the high-efficiency heat transfer between cold fluid and hot fluid is realized. However, since the physical parameters such as specific heat, enthalpy, viscosity and density of supercritical carbon dioxide change with the change of temperature, especially near the critical point, the physical properties change very sharply, and thus the on-way heat exchange coefficient of the shell-and-tube heat exchanger also changes. According to the related heat exchanger design theory, the total heat transfer coefficient of the shell-and-tube heat exchanger depends on the numerical values of the heat exchange coefficients of the supercritical carbon dioxide side and the supercritical water side, and the change of the numerical value of any side can bring about the change of the total heat transfer coefficient. Therefore, how to design the structure of the shell-and-tube heat exchanger to match the heat exchange coefficients of the two sides of the shell-and-tube heat exchanger improves the performance of the heat exchanger and becomes a key technology for designing the heat exchanger.
Disclosure of Invention
Technical problem to be solved
The invention discloses a capillary tube heat exchanger for cooling a variable property fluid, which at least partially solves the technical problem.
(II) technical scheme
The invention provides a capillary heat exchanger for cooling a variable property fluid, which comprises:
a housing having a first fluid inlet and a first fluid outlet at both ends thereof;
the tube box is arranged in the shell, and a second fluid inlet and a second fluid outlet are arranged at two ends of the tube box;
a plurality of heat transfer tube bundles disposed within the tube box and in communication with the first fluid inlet and the first fluid outlet;
the baffle plates are provided with through holes matched with the arrangement modes of the heat transfer tube bundles, and each baffle plate penetrates through the heat transfer tube bundle through the through holes;
and the distance between the baffle plate and the wall of the tube box and the distance between two adjacent baffle plates are gradually reduced and/or the height of the baffle plate is gradually increased along the flowing direction of the fluid in the capillary tube heat exchanger.
In some embodiments, the height of the baffle varies from 50% to 80% of the length of the baffle.
In some embodiments, the shape of the baffle includes an arcuate baffle, a disk annular baffle, an apertured baffle, and a baffle ring.
In some embodiments, the baffles are disposed non-perpendicularly across the heat transfer tube bundle.
In some embodiments, the volume of the space formed between a baffle plate and the wall of the tube box and the volume of the space formed between two adjacent baffle plates are gradually reduced along the direction of the fluid flow in the capillary tube heat exchanger.
In some embodiments, the spacing between two adjacent heat transfer tube bundles is between 1mm and 6 mm.
In some embodiments, the heat transfer tube bundle is made of a metal material.
In some embodiments, the heat transfer tube bundle has an inner diameter of 0.5mm to 3 mm.
(III) advantageous effects
The capillary tube heat exchanger for cooling the variable property fluid provided by the invention has the following beneficial effects:
(1) the heat exchange coefficient of the shell side cooling water is improved by means of the distance between the baffle plates, the shapes of the baffle plates, the size of the baffle plates and the like, so that the matching between the heat exchange coefficient of the tube side supercritical carbon dioxide and the heat exchange coefficient of the shell side cooling water is realized, and the purposes of improving the performance and the heat transfer capacity of the whole heat exchanger are realized;
(2) the invention has the characteristics of simple and convenient design method and simple structure form, can be realized without adding any other parts on the traditional shell-and-tube heat exchanger, and greatly increases the convenience of manufacture.
Drawings
FIG. 1 is a graph showing the change of the heat exchange coefficient of the internal fluid of a conventional shell-and-tube heat exchanger;
FIG. 2 is a general configuration diagram of a shell-and-tube heat exchanger;
FIG. 3 is a graph showing the change of the heat exchange coefficient of the fluid inside the shell-and-tube heat exchanger realized by the present invention;
FIG. 4 is a structural diagram of a shell and tube heat exchanger designed for the spacing of the baffles according to an embodiment of the present invention;
FIG. 5 is a structural view of a shell and tube heat exchanger designed for the height of the baffles according to another embodiment of the present invention;
FIG. 6 is a view of an arcuate baffle configuration as used in an embodiment of the present invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
In the existing shell-and-tube heat exchanger, the working principle is shown in fig. 1, along the length direction of the shell-and-tube heat exchanger, the physical property of water is basically kept unchanged, so the heat exchange coefficient is at a certain value from the inlet to the outlet, and the heat exchange coefficient is gradually increased from the inlet to the outlet due to the change of the physical property of supercritical carbon dioxide, and the difference value between the two is continuously changed.
In view of the above, the invention provides a capillary heat exchanger for cooling a variable property fluid, which is suitable for the field of heat exchanger design in which the property of supercritical carbon dioxide and the like changes and the heat exchange coefficient along the way changes in the heat transfer process.
Now, a specific embodiment is described, an embodiment of the present invention is directed to a design of a variable-property fluid capillary tube-shell heat exchanger, which solves the problem of mismatch of heat exchange coefficients at two sides of the capillary tube-shell heat exchanger, and realizes an overall optimized design of the heat exchanger, and a structure of the capillary tube-shell heat exchanger is shown in fig. 2, and the capillary tube-shell heat exchanger mainly includes:
a housing having a first fluid inlet and a first fluid outlet at both ends thereof;
the tube box is arranged in the shell, and a second fluid inlet Tcin and a second fluid outlet Tcout are arranged at two ends of the tube box;
a plurality of heat transfer tube bundles disposed within the header and in communication with the first fluid inlet Thin and the first fluid outlet Thout;
and the plurality of baffle plates are provided with through holes matched with the arrangement modes of the plurality of heat transfer tube bundles, and each baffle plate is arranged on the heat transfer tube bundle in a penetrating way through the through holes.
Generally, taking the first fluid as supercritical carbon dioxide fluid and the second fluid as cooling water as an example, when the capillary tube shell-and-tube heat exchanger works: on the tube side of the capillary tube heat exchanger, supercritical carbon dioxide fluid flows through the capillary tube 1 (i.e. the heat transfer tube bundle), enters the capillary tube 1 from the left inlet (i.e. the first fluid inlet) Thin, and flows out from the right outlet (i.e. the first fluid outlet) Thout after being cooled, and due to the change of temperature, the physical property of the supercritical carbon dioxide is changed violently in the flowing direction of the capillary tube in the process, so that the heat exchange coefficient is changed greatly; in the shell side of the capillary tube heat exchanger, a low-temperature fluid such as cooling water flows in from a shell side inlet (namely, a second fluid inlet) Tcin, flows out from a shell side outlet (namely, a second fluid outlet) Tcout through the diversion and disturbance of the baffle plates H1-H4, and in the process, the physical property of the cooling water is basically kept unchanged, so that the heat exchange coefficient is basically unchanged. Therefore, the present embodiment is based on the capillary tube shell-and-tube heat exchanger, and the baffle plate therein is further designed, including:
along the flowing direction of fluid in the capillary tube heat exchanger, the distance between the baffle plate and the wall of the tube box and the distance between two adjacent baffle plates are gradually reduced;
and/or the height of the baffle plate is gradually increased along the flowing direction of the fluid in the capillary tube heat exchanger.
Through the design, the heat exchange coefficient of the shell side fluid can be gradually improved along the flow direction, the change trend of the heat exchange coefficient of the tube side fluid is close to that of the tube side fluid, as shown in figure 3, the adaptability of the capillary tube shell type heat exchanger to the cooling of the variable property working medium can be further greatly improved, and the application range and the performance of the heat exchanger are improved.
Based on the above embodiments, further, the baffle plate can be vertically or non-vertically inserted into the heat transfer tube bundle to achieve the effects of disturbing the fluid flow direction, improving the heat transfer effect, and supporting the heat transfer tube bundle. In view of the design of the baffle plates in the present invention, it is only necessary to ensure that the volume of the space formed between the baffle plates and the wall of the tube box and the volume of the space formed between two adjacent baffle plates are gradually reduced along the flowing direction of the fluid in the capillary tube heat exchanger, so that the same technical effect of realizing the matching of the heat exchange coefficients between the cold fluid and the hot fluid can be obtained, thereby realizing the efficient heat transfer of the capillary tube heat exchanger.
It should be noted that in some embodiments, the design height of the baffle may vary from 50% to 80% of the length of the baffle.
In some embodiments, the spacing between two adjacent heat transfer tube bundles is 1mm to 6mm, and in particular, the arrangement of the heat transfer tube bundles is not limited, and the definition of the spacing between two adjacent heat transfer tube bundles includes the definition of the spacing between the heat transfer tube bundles in the vertical direction, or the definition of the spacing in the parallel direction, or the definition of the spacing in any direction.
In other embodiments, the heat transfer tube bundle is made of metal material, and the inner diameter of the heat transfer tube bundle is 0.5mm-3 mm.
Based on the above implementation manner, the present invention further provides two specific embodiments, which are further detailed below for different types of baffle plate designs, respectively:
example 1:
as shown in fig. 4, a metal capillary tube 1 with an inner diameter d of 0.5mm-3mm is used as a tube-side capillary tube material of a capillary tube shell-and-tube heat exchanger, a spacing (in the horizontal direction) W1 between the capillary tubes is 1mm-6mm, a spacing (in the vertical direction) W2 between the capillary tubes is 1mm-6mm, and a supercritical carbon dioxide fluid with a high temperature is fed inside the capillary tube (tube side), and a cooling water with a low temperature is fed inside the capillary tube (shell side).
It should be noted that in this embodiment, only 4 baffles are designed, and in practice, the number of baffles may be 2-20 or even more, depending on the power of the capillary tube shell-and-tube heat exchanger and the length in the fluid flow direction.
Example 2:
as shown in fig. 5, in this embodiment, the metal material capillary 1 having an inner diameter d of 0.5mm to 3mm is also used as the tube-side capillary material of the capillary tube shell-and-tube heat exchanger, the spacing (in the horizontal direction) W1 between the capillaries is 1mm to 6mm, the spacing (in the vertical direction) W2 between the capillaries is 1mm to 6mm, the high-temperature supercritical carbon dioxide fluid flows through the capillaries, and the low-temperature cooling water flows through the capillaries. According to the existing research results, as the height H of the baffle plate increases, as shown in fig. 6, the heat exchange coefficient of the shell side cold fluid increases, so in this embodiment, the heights H corresponding to the baffle plates H1-H4 can be gradually increased to improve the heat exchange coefficient of the water side, but the change range of the height H of the baffle plate generally accounts for 50% -80% of the total baffle plate D.
In other embodiments, the design of the deflector plate can be changed or replaced as follows:
(1) example 1 and example 2 can be used in combination to optimize the heat transfer effect of the heat exchanger;
(2) the embodiments 1 and 2 take the bow-shaped baffle as an example for explanation, and for other types of baffles such as the disc ring-shaped baffle, the hole-type baffle and the baffle ring, the design of the capillary tube-shell heat exchanger can be carried out according to the related ideas in the embodiments 1 or 2.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A capillary heat exchanger for cooling a metamorphic fluid, comprising:
the device comprises a shell, a first fluid inlet and a first fluid outlet, wherein the two ends of the shell are provided with the first fluid inlet and the first fluid outlet;
the tube box is arranged in the shell, and a second fluid inlet and a second fluid outlet are formed in two ends of the tube box;
a plurality of heat transfer tube bundles disposed within the tube box and in communication with the first fluid inlet and the first fluid outlet;
the baffle plates are provided with through holes matched with the arrangement modes of the heat transfer tube bundles, and the baffle plates penetrate through the heat transfer tube bundles through the through holes;
and the distance between the baffle plate and the wall of the tube box and the distance between two adjacent baffle plates are gradually reduced and/or the height of the baffle plate is gradually increased along the flowing direction of the fluid in the capillary tube heat exchanger.
2. The capillary heat exchanger of claim 1 wherein the height of the baffle varies from 50% to 80% of the length of the entire baffle.
3. The capillary heat exchanger of claim 1, wherein the baffle shapes include an arcuate baffle, a disc annular baffle, an apertured baffle, and a baffle ring.
4. The capillary heat exchanger of claim 1, wherein the baffles are non-perpendicularly disposed through the heat transfer tube bundle.
5. The capillary heat exchanger according to claim 1 or 4, characterized in that the volume of the space formed between a baffle plate and the wall of the tube box and the volume of the space formed between two adjacent baffle plates are in a decreasing change in the direction of the fluid flow in the capillary heat exchanger.
6. The capillary heat exchanger of claim 1, wherein the spacing between two adjacent heat transfer tube bundles is 1mm to 6 mm.
7. The capillary heat exchanger of claim 1, wherein the heat transfer tube bundle is of a metallic material.
8. The capillary heat exchanger of claim 1, wherein the heat transfer tube bundle has an inner diameter of 0.5mm to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010445792.9A CN111457763A (en) | 2020-05-22 | 2020-05-22 | Capillary heat exchanger for cooling variable-property fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010445792.9A CN111457763A (en) | 2020-05-22 | 2020-05-22 | Capillary heat exchanger for cooling variable-property fluid |
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| Publication Number | Publication Date |
|---|---|
| CN111457763A true CN111457763A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010445792.9A Pending CN111457763A (en) | 2020-05-22 | 2020-05-22 | Capillary heat exchanger for cooling variable-property fluid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009994A (en) * | 2021-03-26 | 2021-06-22 | 山东英信计算机技术有限公司 | Temperature control system |
| CN113124696A (en) * | 2021-05-13 | 2021-07-16 | 中国科学院工程热物理研究所 | Capillary tube heat exchanger assembled in block mode and assembling method thereof |
| CN113154906A (en) * | 2021-05-13 | 2021-07-23 | 中国科学院工程热物理研究所 | Capillary heat exchanger for heat exchange of variable-property fluid |
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| CN201706925U (en) * | 2010-05-17 | 2011-01-12 | 湖南新紫继换热科技有限公司 | Shell-and-tube heat exchanger |
| CN202993893U (en) * | 2012-12-21 | 2013-06-12 | 北京广厦环能科技有限公司 | Efficient condenser |
| CN204806939U (en) * | 2015-07-08 | 2015-11-25 | 高全生 | Capillary formula oil cooler that gathers |
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| CN106989631A (en) * | 2017-03-21 | 2017-07-28 | 茂名重力石化装备股份公司 | A kind of moon shape deflection plate and shell-and-tube heat exchanger |
| CN208487976U (en) * | 2018-06-17 | 2019-02-12 | 大连优力特换热设备制造有限公司 | A kind of baffle(s) spacing degression type shell-and-tube cooler |
| CN212274702U (en) * | 2020-05-22 | 2021-01-01 | 中国科学院工程热物理研究所 | Capillary heat exchanger for cooling variable-property fluid |
-
2020
- 2020-05-22 CN CN202010445792.9A patent/CN111457763A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2844831Y (en) * | 2005-10-28 | 2006-12-06 | 中油抚顺工程建设有限公司 | Non-equidistant segmental baffle board heat exchangers |
| CN201706925U (en) * | 2010-05-17 | 2011-01-12 | 湖南新紫继换热科技有限公司 | Shell-and-tube heat exchanger |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113009994A (en) * | 2021-03-26 | 2021-06-22 | 山东英信计算机技术有限公司 | Temperature control system |
| CN113124696A (en) * | 2021-05-13 | 2021-07-16 | 中国科学院工程热物理研究所 | Capillary tube heat exchanger assembled in block mode and assembling method thereof |
| CN113154906A (en) * | 2021-05-13 | 2021-07-23 | 中国科学院工程热物理研究所 | Capillary heat exchanger for heat exchange of variable-property fluid |
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