CN104482792A - Axial symmetry type cross inner-fin heat transfer enhanced tube - Google Patents
Axial symmetry type cross inner-fin heat transfer enhanced tube Download PDFInfo
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- CN104482792A CN104482792A CN201410741926.6A CN201410741926A CN104482792A CN 104482792 A CN104482792 A CN 104482792A CN 201410741926 A CN201410741926 A CN 201410741926A CN 104482792 A CN104482792 A CN 104482792A
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Abstract
An axial symmetry type cross inner-fin heat transfer enhanced tube comprises a plurality of unit tubes and rotating unit tubes. The unit tubes and the rotating unit tubes are spaced. The unit tubes rotate in preset angles to form the rotating unit tubes. A plurality of fin pairs vertically relative and wide fins penetrating the section of the heat transfer tube are axially integrally connected with the inside of each unit tube. The wide fins are arranged on the lefts and the rights of the unit tubes. The fin pairs are arranged between the lateral wide fins and in axial symmetry. The distance of the tops of every fin pair is a preset distance L3. The wide fins and the fins extend axially without thorough penetration, allowing smooth segments L1 and inner fin segments L2 to be preserved with preset lengths in the unit tubes and the rotating unit tubes; the heat transfer tube has the advantages that under condensed phase-change heat transfer condition, condensation heat transferred wall surfaces are added, boundary layer thickness of noncondensing air is greatly slimmed, and condensation heat transfer coefficient is increased.
Description
Technical field
The invention belongs to heat exchanger tube technical field, relate to a kind of heat exchanger unit structure, particularly a kind of axial symmetry type intersection inner fin thermoexcell.
Background technology
Heat exchanger has a wide range of applications in the every profession and trade of national economy, is one of modal equipment in the energy, oil, chemical industry, metallurgy, power, light industry, food and even Aero-Space industry.It is not only and ensures technological process and the widely used equipment of condition, and is exploitation secondary energy sources, realizes the visual plant that recuperation of heat economize energy consumes.The thermoexcell of development and Design advanced person and the appropriate design of heat transmission equipment, running and improvement are very important for saving metal, the energy, fund and space.
In heat exchanger tube, add inner fin, both can increase heat exchange area to a certain extent, change again the flow problem of fluid in pipe and resistance distribution, improve the coefficient of heat transfer.
Adopt wing type heat exchanger tube can play two effects, one is improve the coefficient of heat transfer of intraductal working medium to tube wall; Another reduces tube wall temperature.After there is inner fin in pipe, the equivalent diameter of channel cross-section reduces, and due to the reduction of equivalent diameter and the increase of inwall heat exchange area, makes the coefficient of heat transfer of straight interior finned tube far above light pipe.Thus when identical heat exchange amount, lower tube wall temperature can be kept compared with light pipe, the single-phase airflow convection coefficient of heat transfer can not only be improved, be suitable for the occasion that condensation produces simultaneously, when there being condensation phase-change heat-exchange, lower tube wall temperature can obtain larger condensation number and good condensation effect.
Adopt wing type heat exchanger tube to replace a kind of method that common light pipe is enhanced tube inner fluid heat convection, be applicable to the situation that thermal resistance inside pipe is greater than thermal resistance outside pipe.The impact of interior wing heat exchanging tube fluid heat transfer intensity realizes from two aspects.One is that interior wing divide into the less fluid passage of many equivalent diameters pipe, can increase the heat exchange area inside pipe; In addition on the one hand, the reasonable disposition of fin can also improve the flow operating mode in pipe: under certain combination of and fin number high at wing, between tube center and wing, space can be formed with the Secondary Flow being beneficial to heat exchange, and heat transfer effect is significantly improved.
Current employing the most effectively in finned tube formed by means of groove depression and the protruding grafting mutually of ribbed by two identical half shells, half shell is the profiled member that side is opened wide, half shell inwall is dispersed with the fin axially run through, on half shell cross section, fin becomes pectination arrangement perpendicular to composition surface, extend to the position close to composition surface, all leave certain interval between fin heads relative after the grafting of two halves shell, this interior finned tube must coordinate outer tube to use.The interior finned tube of this structure has higher wing ratio, above can destroy the radial temperature profile pattern in non-finned situation largely, increase heat exchange area and convection transfer rate, make cross-section temperature field occur a large amount of low-temperature region, but this structure still have following weak point:
1, cross-section temperature field cannot be realized to maximize uniformly.Can only through stationary conduit when this interior fin structure makes high-temperature flue gas flow through whole heat exchanger tube, the exchange heat that the high-temperature flue gas of different passage is mutual is less, particularly pipeline center's non-finned region is still high temperature gas flow region, cannot realize cross-section temperature field and maximize uniformly.
2, be difficult to ensure sealing, be difficult to ensure to contact well with outer tube.Interior finned tube is formed by two and half shell grafting, is difficult to ensure sealing, and outer tube therefore must be coordinated to use, and there is again the problem with outer tube loose contact, reduces heat transfer effect to a great extent.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, the object of the present invention is to provide a kind of axial symmetry type intersection inner fin thermoexcell, flue gas is along producing the inducer effect and wake flow (generation whirlpool) coefficient effect that are equivalent to manage interior stream in pipe flow process, constantly the flue gas of temperature inequality is carried out blending, the heat of a small amount of high-temperature flue gas is made to be averagely allocated to the flue gas of a large amount of lower temperature, while ensureing that overall cigarette temperature is lower, realize cross-section temperature field to maximize uniformly, enhance disturbance simultaneously, enhance intraductal heat exchange; The radial temperature profile pattern in non-finned situation can also be destroyed completely, greatly increase heat exchange area and fluid turbulent degree, strengthen convection transfer rate, reach best heat transfer effect; For the occasion with condensation phase change heat exchange, the wall of condensation heat transfer can not only be increased, and greatly be thinned incondensable gas boundary layer thickness, increase cooling energy recovery.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of axial symmetry type intersection inner fin thermoexcell, comprise spaced multiple unit pipes 1 and rotary unit pipe 2, described rotary unit pipe 2 rotates predetermined angle by unit pipes 1 to form, described unit pipes 1 is connected with multipair fin opposing upper and lower 3 vertically within it and runs through the wide fin 4 of heat exchanger tube cross section with unit pipes 1 sidewall, described wide fin 4 is positioned at left side and the right side of unit pipes 1, described multipair fin 3 is positioned between the wide fin 4 on left side and right side, and every a pair fin 3 one-tenth axial symmetry opposing upper and lower, distance between often pair of fin 3 top is predeterminable range L3, described wide fin 4 and fin 3 extend vertically but not exclusively run through, and make to leave the smooth section L1 of preset length and interior wing section L2 in unit pipes 1 and rotary unit pipe 2.
Also comprise be arranged on spaced multiple unit pipes 1 and the outer border of rotary unit pipe 2 and and its outer wall to contact outer tube 5.
The ratio of described smooth section L1 and interior wing section L2 is 0.2 ~ 0.5.
Described predetermined angle is 45 ° ~ 90 °.
Described predetermined angle is 60 ° or 90 °.
Described predeterminable range L3 is 6 ~ 8mm.
The number of described fin 3 is according to the smoke temperature change passed into, and when the temperature is low, the number of fin 3 increases.
Described wide fin 4 and fin 3 are flat board with holes, spherical bubbling, bar shaped bubbling, waveform, segmentation serrated fin or intersection serrated fin.
Described unit pipes 1 and the cross section of rotary unit pipe 2 are circular, oval, polygon or square.
The material of described unit pipes 1, rotary unit pipe 2, fin 3, wide fin 4 and outer tube 5 adopts cast aluminium, alusil alloy, stainless steel or titanium alloy.
Compared to the prior art comparatively, the present invention possesses following advantage:
1, multiple unit pipes 1 and rotary unit pipe 2 spaced, there is periodically change in thermoexcell cross section, flue gas along in pipe flow process from one in wing section enter adjacent smooth section time there is inducer effect (velocity of flue gas is close to mainstream speed), and eddy current is there is when flue gas enters wing section in next from smooth section, the flue gas failing to realize homogeneous temperature in interior finned tube section is made to be able in the strong blending of smooth section, exchange heat is directly carried out in flue gas inside, the heat of a small amount of high-temperature flue gas is made to be averagely allocated to the flue gas of a large amount of lower temperature, while ensureing that overall cigarette temperature is lower, realize cross-section temperature field to maximize uniformly, simultaneously, wing section cross section periodically changes and also enhances disturbance, enhance intraductal heat exchange.
2, the design of unit pipes 1 and rotary unit pipe 2 inner fin 3 and wide fin 4, heat exchanger tube is made to have very high wing ratio, design in conjunction with smooth section can destroy the radial temperature profile pattern in non-finned situation completely, greatly increase heat exchange area and fluid turbulent degree, strengthen convection transfer rate, effective reduction flue-gas temperature, realizes cross-section temperature field even as far as possible.
3, unit pipes is the overall structure that circumference is closed, and directly can pour into and form, and manufacture craft is simple, and without sealing problem, without the need to outer tube, can directly use as heat exchanger tube.
4, the design of outer tube 5, by changing thickness and material to adapt to different working medium and various heat exchange condition, and then realizes enhanced heat exchange.
5, the design of unit pipes 1 and rotary unit pipe 2 inner width fin 4, when having outer tube 5, interior finned tube and outer tube can be closely cooperated, interference fit is realized because adding thermal expansion during work, prevent the heat transfer effect caused because of inner and outer pipes loose contact from reducing, wide wing plate 4 self is also as heat-transfer surface simultaneously, adds heat exchange area, enhances heat exchange.For the occasion with condensation phase change heat exchange, the wall of condensation heat transfer can not only be increased, and greatly be thinned incondensable gas boundary layer thickness, increase cooling energy recovery.
Accompanying drawing explanation
Fig. 1 a is the structural representation of axial symmetry type of the present invention intersection inner fin thermoexcell.
Fig. 1 b be Fig. 1 a along A-A to sectional view.
Fig. 1 c be Fig. 1 a along B-B to sectional view.
Fig. 1 d be Fig. 1 a along C-C to sectional view.
Fig. 1 e be Fig. 1 a along D-D to sectional view.
Fig. 2 is that axial symmetry type of the present invention intersects inner fin thermoexcell right view when having an outer tube.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be described in more detail.
As shown in Fig. 1 a, Fig. 1 b, Fig. 1 c, Fig. 1 d, Fig. 1 e and Fig. 2, a kind of axial symmetry type intersection of the present invention inner fin thermoexcell, comprise spaced multiple unit pipes 1 and rotary unit pipe 2, described rotary unit pipe 2 rotates predetermined angle by unit pipes 1 to form.Described unit pipes 1 is connected with multipair fin opposing upper and lower 3 vertically within it and runs through the wide fin 4 of heat exchanger tube cross section with unit pipes 1 sidewall, described wide fin 4 is positioned at left side and the right side of unit pipes 1, described multipair fin 3 is positioned between the wide fin 4 on left side and right side, and often pair of fin 3 one-tenth axial symmetry opposing upper and lower, distance between often pair of wing plate 3 top is predeterminable range L3, the design of fin 3 and wide fin 4, heat exchanger tube is made to have very high wing ratio, design in conjunction with smooth section can destroy the radial temperature profile pattern in non-finned situation completely, greatly increase heat exchange area and fluid turbulent degree, strengthen convection transfer rate, effective reduction flue-gas temperature, realize cross-section temperature field as far as possible even.Described wide fin 4 and fin 3 extend vertically but not exclusively run through, make in unit pipes 1 and rotary unit pipe 2, to leave the smooth section L1 of preset length and interior wing section L2, multiple unit pipes 1 and rotary unit pipe 2 spaced, there is periodically change in thermoexcell cross section, flue gas along in pipe flow process from one in wing section enter adjacent smooth section time there is inducer effect (velocity of flue gas is close to mainstream speed), and eddy current is there is when flue gas enters wing section in next from smooth section, the flue gas failing to realize homogeneous temperature in interior finned tube section is made to be able in the strong blending of smooth section, exchange heat is directly carried out in flue gas inside, the heat of a small amount of high-temperature flue gas is made to be averagely allocated to the flue gas of a large amount of lower temperature, while ensureing that overall cigarette temperature is lower, realize cross-section temperature field to maximize uniformly, simultaneously, wing section cross section periodically changes and also enhances disturbance, enhance intraductal heat exchange.
As the preferred embodiment of the present invention, also comprise be arranged on spaced multiple unit pipes 1 and the outer border of rotary unit pipe 2 and and its outer wall to contact outer tube 5.The design of outer tube 5, by changing thickness and material to adapt to different working medium and various heat exchange condition, and then realizes enhanced heat exchange.When having outer tube 5, the design of wide fin 4 makes interior finned tube and outer tube to closely cooperate, realize interference fit because adding thermal expansion during work, prevent the heat transfer effect caused because of inner and outer pipes loose contact from reducing, wide wing plate 4 self is also as heat-transfer surface simultaneously, add heat exchange area, enhance heat exchange, for the occasion with condensation phase change heat exchange, the wall of condensation heat transfer can not only be increased, and be greatly thinned incondensable gas boundary layer thickness, increase cooling energy recovery.
As the preferred embodiment of the present invention, the ratio of described smooth section L1 and interior wing section L2 is 0.2 ~ 0.5.This ratio makes flue gas while smooth section carries out enough blending, enters as early as possible in next and realizes enhanced heat transfer in wing section.
As the preferred embodiment of the present invention, described predetermined angle is 45 ° ~ 90 °.Further, described predetermined angle is 60 ° or 90 °.This predetermined angle makes interior wing section cross section be cyclically-varying, further enhancing disturbance, enhances intraductal heat exchange, reduces inner tube smoke internal difference in temperature.
As the preferred embodiment of the present invention, described predeterminable range L3 is 6 ~ 8mm.
As the preferred embodiment of the present invention, the number of described fin 3 is according to the smoke temperature change passed into, and when the temperature is low, the number of fin 3 increases.Realizing keeping relatively high flue gas flow rate while flue gas volume reduces gradually, particularly under flue gas condensing needs flue gas to tear the condition of liquid film, can significantly increase convection current and condensation heat transfer coefficient.
As the preferred embodiment of the present invention, described wide fin 4 and fin 3 are flat board with holes, spherical bubbling, bar shaped bubbling, waveform, segmentation serrated fin or intersection serrated fin, to increase heat exchange area and to strengthen disturbance.
As the preferred embodiment of the present invention, described unit pipes 1 and the cross section of rotary unit pipe 2 are circular, oval, polygon or square.Varying cross-section can adapt to different placement spaces, the arranged mode of adjustment heat exchanger tube
As the preferred embodiment of the present invention, the material of described unit pipes 1, rotary unit pipe 2, fin 3, wide fin 4 and outer tube 5 adopts cast aluminium, alusil alloy, stainless steel or titanium alloy.Compared with traditional cast iron formula or stainless steel heat exchange tube, cast aluminium or alusil alloy are applied to heat exchanger tube and have following advantage: the thermal conductivity factor of aluminium is stainless 8 times, and combustion chamber and water route design give larger space; In anticorrosive, aluminium can effectively prevent sour corrosion and oxygen corrosion, and reliability is higher; From cost of material, processability was seen originally with being processed into, and aluminium has absolute predominance.Described thermoexcell connecting portion preferentially can select friction stir welding; do not need to consume welding rod and coating; efficiently, environmental protection; also other docking welding methods can be selected, as: the welding manners such as Lincoln weld, gas tungsten arc welding (TIG), welding (MIG) or active gas shielded arc welding (MAG) connect.
Operation principle
The transmission of heat energy has mode three kinds: heat transfer, thermal convection current and heat radiation.Wherein heat transfer transferring heat is Φ=hA Δ t.Influence factor mainly contains the temperature difference, heat exchange area and flow velocity, improves flow velocity and heat exchange area effectively can increase heat output when the temperature difference is constant.
High-temperature flue gas passes through in axial symmetry type intersection inner fin thermoexcell, pipe outflowed cryogen, and the heat of high-temperature flue gas passes to tube wall by heat transfer, and tube wall transfers heat to the outer cryogen of pipe by heat transfer again, thus reduction flue-gas temperature, improve extratubal fluid temperature.
In single-phase heat transfer process, flue gas along in pipe flow process from one in wing section enter adjacent smooth section time there is inducer effect (velocity of flue gas is close to mainstream speed), and occur eddy current when flue gas enters wing section in next from smooth section, thus it is very remarkable to make it manage interior augmentation of heat transfer.And when high-temperature flue gas flows through interior wing section, high-temperature gas in heat exchanger tube is divided into some heat exchange area by fin 3 and wide wing plate 4, substantially increase heat exchange area, enhance heat exchange; Form the flow field of high flow velocities in the flowing space simultaneously between fin, the existence of the various shapes that fin and fin process strengthens disturbance, makes turbulence excess, further enhances fluid interchange.
In the heat transfer process with condensation phase transformation, several unit pipes 1 and rotary unit pipe 2 interlaced arrangement, the inducer effect produced due to cross section mechanical periodicity and wake effect enhance the disturbance of fluid in pipe, easier thinning incoagulable gas boundary layer thickness, as long as the steam in mainstream smoke can condense through thinner incoagulable gas boundary layer on fin wall.Interior wing section, due to the segmentation effect of fin, by high-temperature flue gas laminating, is greatly thinned incoagulable gas boundary layer thickness, significantly weakens the obstruction of incoagulable gas boundary layer to water vapor condensation.After fin surface temperature simultaneously after enhanced heat exchange reduces, for in flue gas, the condensation of steam further provides temperature difference power, the condensate liquid be attached to after condensation in fin and frame wall can be discharged in time by the effect of gravity and sweep of gases, fin surface punches, or fin make bubbling type, waveform and segmentation, intersection the structure such as saw tooth fin destroy thickness of liquid film further, reduce heat transfer and the resistance to mass tranfer of liquid film, condensing heat-exchange is strengthened further.
Claims (10)
1. an axial symmetry type intersection inner fin thermoexcell, it is characterized in that: comprise spaced multiple unit pipes (1) and rotary unit pipe (2), described rotary unit pipe (2) rotates predetermined angle by unit pipes (1) to form, described unit pipes (1) is connected with multipair fin opposing upper and lower (3) vertically within it and runs through the wide fin (4) of heat exchanger tube cross section with unit pipes (1) sidewall, described wide fin (4) is positioned at left side and the right side of unit pipes (1), described multipair fin (3) is positioned between the wide fin (4) on left side and right side, and often pair of fin opposing upper and lower (3) becomes axial symmetry, distance between often pair of wing plate (3) top is predeterminable range L3, described wide fin (4) and fin (3) extend vertically but not exclusively run through, and make to leave the smooth section L1 of preset length and interior wing section L2 in unit pipes (1) and rotary unit pipe (2).
2. a kind of axial symmetry type according to claim 1 intersects inner fin thermoexcell, it is characterized in that: also comprise be arranged on spaced multiple unit pipes (1) and rotary unit pipe (2) outer border also and its outer wall to contact outer tube (5).
3. a kind of axial symmetry type intersection inner fin thermoexcell according to claim 1, is characterized in that: the ratio of described smooth section L1 and interior wing section L2 is 0.2 ~ 0.5.
4. a kind of axial symmetry type intersection inner fin thermoexcell according to claim 1, is characterized in that: described predetermined angle is 45 ° ~ 90 °.
5. a kind of axial symmetry type intersection inner fin thermoexcell according to claim 4, is characterized in that: described predetermined angle is 60 ° or 90 °.
6. a kind of axial symmetry type intersection inner fin thermoexcell according to claim 1, is characterized in that: described predeterminable range L3 is 6 ~ 8mm.
7. a kind of axial symmetry type intersection inner fin thermoexcell according to claim 1, is characterized in that: the number of described fin (3) is according to the smoke temperature change passed into, and when the temperature is low, the number of fin (3) increases.
8. a kind of axial symmetry type according to claim 1 intersects inner fin thermoexcell, it is characterized in that: described wide fin (4) and fin (3) are flat board with holes, spherical bubbling, bar shaped bubbling, waveform, segmentation serrated fin or intersection serrated fin.
9. a kind of axial symmetry type intersection inner fin thermoexcell according to claim 1, is characterized in that: described unit pipes (1) and the cross section of rotary unit pipe (2) are circular, oval, polygon or square.
10. a kind of axial symmetry type intersection inner fin thermoexcell according to claim 2, is characterized in that: the material of described unit pipes (1), rotary unit pipe (2), fin (3), wide fin (4) and outer tube (5) adopts cast aluminium, alusil alloy, stainless steel or titanium alloy.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110425777A (en) * | 2019-08-30 | 2019-11-08 | 中国科学院理化技术研究所 | A kind of freezer cooling grid and freezer local temperature control method |
| CN110542341A (en) * | 2019-09-17 | 2019-12-06 | 常州大学 | High-density coupling double-effect reinforced pipe |
| CN113137620A (en) * | 2021-04-19 | 2021-07-20 | 浙江上能锅炉有限公司 | Smoke tube with fins |
| CN114087909A (en) * | 2021-11-19 | 2022-02-25 | 西安交通大学 | Self-vibration inserted bending deflection type fin composite smoke tube |
| CN115970326A (en) * | 2023-02-08 | 2023-04-18 | 连云港铭磊科技有限公司 | High-purity crystallizer for acrylic acid |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425777A (en) * | 2019-08-30 | 2019-11-08 | 中国科学院理化技术研究所 | A kind of freezer cooling grid and freezer local temperature control method |
| CN110425777B (en) * | 2019-08-30 | 2023-12-19 | 中国科学院理化技术研究所 | Cold storage calandria evaporator and cold storage local temperature control method |
| CN110542341A (en) * | 2019-09-17 | 2019-12-06 | 常州大学 | High-density coupling double-effect reinforced pipe |
| CN113137620A (en) * | 2021-04-19 | 2021-07-20 | 浙江上能锅炉有限公司 | Smoke tube with fins |
| CN114087909A (en) * | 2021-11-19 | 2022-02-25 | 西安交通大学 | Self-vibration inserted bending deflection type fin composite smoke tube |
| CN114087909B (en) * | 2021-11-19 | 2022-10-25 | 西安交通大学 | Self-vibration inserted bending deflection type fin composite smoke tube |
| CN115970326A (en) * | 2023-02-08 | 2023-04-18 | 连云港铭磊科技有限公司 | High-purity crystallizer for acrylic acid |
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Application publication date: 20150401 Assignee: YIZHENG YONGHUI RADIATING PIPE MANUFACTURING Co.,Ltd. Assignor: XI'AN JIAOTONG University Contract record no.: X2022610000009 Denomination of invention: An axisymmetric cross inner fin enhanced heat exchange tube Granted publication date: 20160817 License type: Exclusive License Record date: 20220614 |