CN112595148A - S-shaped tube bundle cross-flow type tube-shell heat exchanger based on foam metal - Google Patents
S-shaped tube bundle cross-flow type tube-shell heat exchanger based on foam metal Download PDFInfo
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- CN112595148A CN112595148A CN202011422779.8A CN202011422779A CN112595148A CN 112595148 A CN112595148 A CN 112595148A CN 202011422779 A CN202011422779 A CN 202011422779A CN 112595148 A CN112595148 A CN 112595148A
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- Prior art keywords
- tube
- shell
- heat exchanger
- heat exchange
- foam metal
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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
- 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
- F28D7/08—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 otherwise bent, e.g. in a serpentine or zig-zag
- F28D7/082—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 otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
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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
- 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
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- 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
- F28F13/003—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by using permeable mass, perforated or porous materials
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- 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
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- 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
- F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
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- 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
- F28F21/087—Heat exchange elements made from metals or metal alloys from nickel or nickel alloys
Abstract
The invention discloses an S-shaped tube bundle cross-flow type tube-shell heat exchanger based on foam metal. The central connecting line of two adjacent straight pipe sections of the heat exchange pipe and the shell flange form a 30-degree axial direction, and the foam metal fins are only filled in the shell outside the straight pipe sections of the heat exchange pipe; different heat exchange tubes are spirally arranged in parallel in the shell at equal intervals to form an S-shaped tube bundle; the arrangement mode greatly increases the secondary heat exchange area. The second fluid flows in the shell of the heat exchanger and simultaneously flows in the micropores of the foam metal, and the two fluids are crossed to fully exchange heat. The foam metal with high porosity is used as the cold side structure of the heat exchanger, and has the advantages of light specific gravity, large specific surface area, high porosity, high pore density and the like; and the device also has a strong disturbance effect, and can promote the fluid flowing through the device to be fully mixed, thereby obviously improving the heat transfer efficiency.
Description
Technical Field
The invention belongs to the technical field of heat exchangers, relates to a tube-shell heat exchanger, and particularly relates to an S-shaped tube bundle cross-flow type tube-shell heat exchanger based on foam metal.
Background
The efficient and compact heat exchanger can effectively solve the problem of heat management of the aircraft engine and plays a vital role in the heat management. The reduction of the inlet air temperature is beneficial to reducing the thrust weight of the engine, and the inlet air can have sufficient expansion ratio; along with the increase of the flying speed, the air input of the engine can be greatly reduced, so that the requirement of full combustion of fuel cannot be met, which are two important heat management problems faced by the current aircraft.
On the technical premise that a shell-and-tube heat exchanger is mature, foam metal is added into the heat exchanger to replace the traditional metal fin. A compact and efficient porous medium foam metal heat exchanger is developed and applied to the field of aerospace. The foam metal with high porosity has the advantages of light specific gravity, large specific surface area, high porosity, high pore density and the like; and has strong disturbance effect, and can promote the fluid flowing through the mixing chamber to be fully mixed. The foam metal heat exchanger can not only obviously improve the heat exchange efficiency, but also not greatly influence the load of the airplane, and simultaneously, can also reduce the air inlet temperature and improve the air inlet amount.
Disclosure of Invention
The invention provides a cross-flow type tube-shell heat exchanger based on an efficient and compact S-shaped foam metal structure, aiming at solving the heat management problems of high air inlet temperature and large air inlet amount of an aeroengine.
In order to solve the technical problems, the invention adopts the technical scheme that: the cross-flow type tube shell heat exchanger comprises an outer shell of the heat exchanger, end sockets, flanges, heat exchange tubes fixed at baffle plates at two sides and foam metal fins at the outer sides of the heat exchange tubes; the central connecting line of two adjacent straight pipe sections of the heat exchange pipe and a shell (axial direction of a flange) in the horizontal direction of the heat exchanger form a radian of 30 degrees, and the foam metal fins are only wrapped on the outer sides of the straight pipe sections of the heat exchange pipe; different heat exchange tubes are spirally arranged in parallel in the shell at equal intervals to form an S-shaped tube bundle; the first fluid flows inside the S-tube bundle and the second fluid flows inside the shell of the heat exchanger outside the tube bundle.
The first fluid is liquid such as water or oil, the second fluid is gas, and the two fluids flow in a cross-flow mode. The metal foam has micro-porous pores therein, and the second fluid can also flow in the pores.
The heat exchange tubes are made of stainless steel tubes or red copper capillaries, the outer diameter of each heat exchange tube is 4mm, the wall thickness is 1mm, the length of each straight tube section is 35mm, the radius of an inner ring at a bent tube is 4mm, and the radius of an outer ring is 8 mm. The heat exchange tubes with the same specifications are arranged in the shell in parallel at equal intervals, the direction of the S-shaped spiral of each heat exchange tube is perpendicular to the direction of the tube arrangement, the horizontal distance of the straight tube section of the same steel tube is 2.5 times of the outer diameter of the steel tube, and the vertical direction arrangement distance between different steel tubes is 3 times of the outer diameter of the steel tube.
And two ends of each heat exchange tube are fixed at the baffle in a brazing welding mode.
The foam metal is made of foam metal copper, foam metal nickel or foam metal aluminum or alloy thereof, the thickness is 3mm, the porosity is 45% -90%, and the pore density is 20-85 PPI.
The foam metal is tightly connected at the straight pipe section of the heat exchange pipe in a welding or high-temperature heat conducting adhesive bonding mode. Two ends of each heat exchange tube are fixed at the baffle in a welding mode.
The shell of the heat exchanger is made of 304 stainless steel materials, the wall thickness is 1mm, the end sockets on the two sides are connected with the shell in a brazing welding mode, and the manufacturing process is simple.
The efficient and compact cross-flow type tube-shell heat exchanger with the S-shaped foam metal structure has the greatest advantages that foam metal with high porosity is used as a cold side structure of the heat exchanger, and the cross-flow type tube-shell heat exchanger has the advantages of light specific gravity, large specific surface area, high porosity, high pore density and the like; and has strong disturbance effect, and can promote the fluid flowing through the mixing chamber to be fully mixed. The pipe bundle is bent into a spiral S-shaped pipe bundle at an angle of 30 degrees from the axial direction of the flange, so that the retention time of fluid in the heat exchange pipe can be prolonged, and the heat exchange efficiency is improved; the cross flow mode can ensure that two fluids can fully exchange heat, thereby further increasing the heat exchange efficiency. Through experimental result comparison and analysis, the heat exchange efficiency is improved by 70-80%. The heat exchanger is small in size and compact in structure, can realize efficient and enhanced heat exchange, improves the heat management of the aircraft engine, and reduces the load problem of the aircraft.
Drawings
FIG. 1 is a front view (cross-sectional structure) of a metal foam based cross-flow shell-and-tube heat exchanger of the present invention;
FIG. 2 is a left side view (cross-sectional view) of the foamed metal based S-shaped tube bundle cross-flow shell-and-tube heat exchanger of the present invention; (a) a vertical cross-sectional view of the foam metal heat exchange tube; (b) a horizontal cross-sectional view of the metal foam tube;
FIG. 3 is a top view of a metal foam based cross flow shell and tube heat exchanger of the present invention;
FIG. 4 is a three-dimensional cross-sectional view of an S-shaped tube bundle cross-flow shell-and-tube heat exchanger based on metal foam according to the present invention;
fig. 5 is a view of the interface flange of the foamed metal based S-tube bundle cross-flow shell-and-tube heat exchanger of the present invention.
In the figure: 1, a flange; 2, sealing the end; 3, a shell; 4, heat exchange of a steel pipe; 5 foam metal fins.
Detailed Description
The structure diagram according to the invention is explained in more detail below.
As shown in fig. 1 and 2, the cross-flow type tube-in-shell heat exchanger based on the foamed metal S-shaped tube bundle comprises a flange 1 of the heat exchanger, a head 2, a shell 3, a heat exchange tube 4 and a foamed metal fin 5. The two ends of each S-shaped pipe are fixed at the baffle by brazing welding, 3S-shaped heat exchange pipes are arranged in total, the bent pipe is bent at a radian of 30 degrees, a layer of foam metal 5 is tightly connected at the straight pipe section, each section of pipe is spirally arranged in the shell 3 in parallel at equal intervals, the shell of the heat exchanger is arranged on the outer side of the heat exchange pipe 4, and the two ends of each fluid inlet and outlet are connected with an end enclosure and a flange. The foam metal fin is made of a nickel-chromium alloy material, the porosity is 45%, and the pore density is 85 PPI.
The heat exchanger is less in size, and length and width height is 65 x 55 x 45mm, and the model of flange is HG20592, loose flange, flange external diameter 105mm, internal diameter 75mm, thickness 16mm, bolt hole 14mm, and the model of external tapping is DN 20. The flange is connected with the seal head, the seal head is connected with the shell, a brazing welding mode is adopted, foam metal is fixed on the heat exchange steel pipe by using a vacuum welding or high-temperature heat conducting glue bonding method, gaps are avoided as far as possible, contact thermal resistance is reduced, heat exchange is enhanced, and the heat exchange is carried out through an experimental result and a pipe type: compared with the prior heat exchanger without foam metal fins, the U-shaped tube light pipe has the advantage that the heat exchange efficiency is improved by 70-80 percent.
The first heat exchange fluid flows in the shell and the foam metal fins outside the heat exchange tubes and is air, and the second fluid flows in the heat exchange tubes and is water or oil and the like, and the working condition is that the temperature is 20-95 ℃ and the pressure is 1.6 MPa. When fluid enters the end socket, the fluid is divided in the end socket, and the first fluid flows in the shell of the heat exchanger and also flows in gaps in the foam metal fins, so that disturbance is enhanced and the first fluid is fully mixed; the second fluid enters each heat exchange tube, and the S-shaped tube bundle can prolong the retention time of the second fluid in the heat exchange tubes and prolong the heat exchange time. The comprehensive effect of the secondary heat exchange area is enhanced by the S-shaped heat exchange tubes and the foam metal fins, the heat exchange efficiency of the heat exchanger is greatly improved compared with that of a traditional shell-and-tube heat exchanger, and heat exchange is enhanced. The quality of foam metal is light, and the size of heat exchanger is less, can reduce the heavy burden of engine, and the heat exchanger of high-efficient compact structure and then can help solving aeroengine's thermal management problem: the intake air temperature is reduced, and the intake air amount is increased.
Claims (7)
1. The cross-flow type tube-shell heat exchanger of the S-shaped tube bundle based on the foam metal comprises an outer shell of the heat exchanger, end sockets, flanges, heat exchange tubes fixed at baffle plates at two sides and foam metal fins at the outer sides of the heat exchange tubes; the heat exchange tube is characterized in that the central connecting line of two adjacent straight tube sections of the heat exchange tube and a shell flange form a 30-degree axial direction, and the foam metal fins are only filled in a shell outside the straight tube sections of the heat exchange tube; different heat exchange tubes are spirally arranged in parallel in the shell at equal intervals to form an S-shaped tube bundle; the first fluid flows inside the S-tube bundle and the second fluid flows inside the shell of the heat exchanger outside the tube bundle.
2. The cross-flow shell-and-tube heat exchanger of foamed metal-based S-shaped tube bundle of claim 1, wherein the first fluid is a liquid and the operating conditions are a temperature of 20-95 ℃ and a pressure of 1.6 MPa; the second fluid is gas at normal temperature and normal pressure, and the two fluids flow in a cross flow mode.
3. The cross-flow shell and tube heat exchanger based on foamed metal and having S-shaped tube bundles as claimed in claim 1, wherein the material of the heat exchange tube comprises stainless steel tube or red copper capillary tube; the foam metal fin is made of foam metal copper, foam metal nickel or foam metal aluminum or alloy of the foam metal copper and the foam metal nickel, and the foam metal fin is made in a 3D printing mode.
4. The metal foam based S-bundle cross-flow shell-and-tube heat exchanger of claim 1, wherein the metal foam fins have a porosity of 45% to 90% and a cell density of 20 to 85 PPI.
5. The cross-flow shell-and-tube heat exchanger based on the foamed metal S-shaped tube bundle is characterized in that the foamed metal fins are tightly connected to the straight tube sections of the heat exchange tubes in a welding or high-temperature heat-conducting adhesive bonding mode; two ends of each heat exchange tube are fixed at the baffle in a welding mode.
6. The metal foam-based S-tube bundle cross-flow shell-and-tube heat exchanger of claim 1, wherein each heat exchange tube has an outer diameter of 4mm, a wall thickness of 1mm, and a thickness of the metal foam fins of 3 mm.
7. The cross-flow shell-and-tube heat exchanger based on foamed metal and having S-shaped tube bundles as claimed in claim 1, wherein the shell of the heat exchanger is made of 304 stainless steel material, the wall thickness is 1mm, and the two side end sockets are connected with the shell in a welded manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422779.8A CN112595148A (en) | 2020-12-08 | 2020-12-08 | S-shaped tube bundle cross-flow type tube-shell heat exchanger based on foam metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011422779.8A CN112595148A (en) | 2020-12-08 | 2020-12-08 | S-shaped tube bundle cross-flow type tube-shell heat exchanger based on foam metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112595148A true CN112595148A (en) | 2021-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011422779.8A Withdrawn CN112595148A (en) | 2020-12-08 | 2020-12-08 | S-shaped tube bundle cross-flow type tube-shell heat exchanger based on foam metal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112595148A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688889A (en) * | 2022-03-22 | 2022-07-01 | 东南大学 | Space lattice type foam metal-based intensified condensing device of aerospace thermal control system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6142222A (en) * | 1998-05-23 | 2000-11-07 | Korea Institute Of Science And Technology | Plate tube type heat exchanger having porous fins |
| US20090084520A1 (en) * | 2007-09-28 | 2009-04-02 | Caterpillar Inc. | Heat exchanger with conduit surrounded by metal foam |
| CN101839656A (en) * | 2009-03-17 | 2010-09-22 | 铜联商务咨询（上海）有限公司 | Sleeve-type efficient foam metal heat exchanger |
| CN101839664A (en) * | 2010-05-25 | 2010-09-22 | 华南理工大学 | Shell-and-tube heat exchanger and manufacturing method thereof |
| CN201748825U (en) * | 2009-08-13 | 2011-02-16 | 河北科技大学 | Multilayer foam metal tube-and-shell heat exchanger |
| CN104896968A (en) * | 2015-06-16 | 2015-09-09 | 中国石油大学(华东) | Metal foam finned tube heat exchanger |
| CN208075627U (en) * | 2018-04-20 | 2018-11-09 | 江苏唯益换热器股份有限公司 | S type heat exchangers |
-
2020
- 2020-12-08 CN CN202011422779.8A patent/CN112595148A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6142222A (en) * | 1998-05-23 | 2000-11-07 | Korea Institute Of Science And Technology | Plate tube type heat exchanger having porous fins |
| US20090084520A1 (en) * | 2007-09-28 | 2009-04-02 | Caterpillar Inc. | Heat exchanger with conduit surrounded by metal foam |
| CN101839656A (en) * | 2009-03-17 | 2010-09-22 | 铜联商务咨询（上海）有限公司 | Sleeve-type efficient foam metal heat exchanger |
| CN201748825U (en) * | 2009-08-13 | 2011-02-16 | 河北科技大学 | Multilayer foam metal tube-and-shell heat exchanger |
| CN101839664A (en) * | 2010-05-25 | 2010-09-22 | 华南理工大学 | Shell-and-tube heat exchanger and manufacturing method thereof |
| CN104896968A (en) * | 2015-06-16 | 2015-09-09 | 中国石油大学(华东) | Metal foam finned tube heat exchanger |
| CN208075627U (en) * | 2018-04-20 | 2018-11-09 | 江苏唯益换热器股份有限公司 | S type heat exchangers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688889A (en) * | 2022-03-22 | 2022-07-01 | 东南大学 | Space lattice type foam metal-based intensified condensing device of aerospace thermal control system |
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Application publication date: 20210402 |