CN105021080B - Wear-resistant extended surface tube and heat exchanger - Google Patents
Wear-resistant extended surface tube and heat exchanger Download PDFInfo
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- CN105021080B CN105021080B CN201510489236.0A CN201510489236A CN105021080B CN 105021080 B CN105021080 B CN 105021080B CN 201510489236 A CN201510489236 A CN 201510489236A CN 105021080 B CN105021080 B CN 105021080B
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- tube
- extended surface
- fin
- base tube
- surface tube
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Abstract
The invention discloses a kind of wear-resistant extended surface tube and heat exchanger, wherein wear-resistant extended surface tube includes base tube and is arranged on the fin of the base tube outer surface, it is characterised in that：The drainage trough of a upper end open is provided with the fluoran stream surface of the fin, the height of the drainage trough is high for 1/2 to 4/5 wing, and the width of drainage trough is the 1/6 ~ 1/4 of the base tube diameter；The fin is spaced apart parallel fins or spiral fin.Compared with prior art, the present invention slots the extended surface area influence on extended surface tube less on spiral or circular extended surface tube fluoran stream surface fin, remains the big advantage of extended surface tube heat exchange area.By adjusting the height and width of drainage trough, so as to be effectively improved conventional helical extended surface tube or circular extended surface tube abrasion condition, abrasion resistant qualities are better than H type extended surface tubes.Simultaneously because fin of the present invention is circular arc, fin wear resistance is more more obvious than H type extended surface tube advantages.
Description
Technical field
The present invention is applied to boiler flue heat-exchange device field, is specifically related to one kind and is effectively improved heat exchanger tube abrasion resistant qualities
Extended surface tube and heat exchanger with the extended surface tube.
Background technology
Extended surface tube is one of important heat exchange element of industrial recovery waste heat, augmentation of heat transfer, because of its compact conformation, can be increased
The total effective area of heat convection is participated in, many advantages, such as managing outer heat transfer resistance is reduced and is used widely.What industry was commonly used
Extended surface tube has circular extended surface tube, H types extended surface tube, screw type extended surface tube etc..When ash-laden gas, which flows through heat exchanger, washes away heating surface,
Flue gas particle in air-flow is hit with tube wall, and abrasion will be caused to extended surface tube by accumulating over a long period, and extended surface tube effect of attrition is changed
The heat exchange efficiency of hot device, when serious also pipe can be leaked, boiler down is forced, and huge economic loss is brought to production
And potential safety hazard.Due to extended surface tube abrasion and diameter, flue gas flow rate and the particle and wall projected angle of impact of flue gas particle
It is relevant Deng many factors, to take into full account these factors when extended surface tube is designed.When flue gas flows through different cast extended surface tubes, fin
The difference of plate shape causes the difference that flue gas flow field is distributed, in the case of particle diameter size identical, local at tube wall
Flue gas flow rate is higher, particle and wall shock when particle speed and the tangential angle of wall it is bigger, particle is to tube wall in flue gas
Rate of depreciation is also bigger, and the wear resistance of extended surface tube is also poorer.
The measure for improving extended surface tube abrasion resistant qualities from extended surface tube geometrical aspects at present has：
1. use H type extended surface tubes.Due to cracking so that having certain speed on base tube windward side at stationary point for H type extended surface tubes
Degree, forms and axially washes away tube wall, and this and common tube have essential difference, and the generation of axial velocity reduces the angle of impingement of particle
Degree, rate of depreciation is accordingly reduced.But H types extended surface tube uses intermediate frequency welding procedure, and not only production cost is higher, and limited
The fin number arranged in space is relatively fewer, and heat exchange efficiency is less than conventional helical extended surface tube.
2. use Dual-H-type finned tube.Dual-H-type finned tube rigidity is more stronger than H type extended surface tubes, the similar H types of its wear-resistant mechanism
Extended surface tube, because two foundation pipes share a fin, fin abrasion is concentrated mainly on fluoran stream surface, therefore Dual-H-type finned tube fin is total
Body abrasion resistance properties are more excellent than H type extended surface tubes.And Dual-H-type finned tube equally exists production cost height and heat exchange efficiency is relatively low
Shortcoming.
3. use diaphragm pipe.Compared with light pipe, in the case where pipe changes less along the longitudinal row of flue gas, increase flue gas
Circulation area, reduces flue gas flow rate, improves abrasionproof effect.Tandem tube bank is divided into by diaphragm pipe by coiled pipe and diaphragm connection
Oneself independent temperature field, velocity field and concentration field.The wear-resistant mechanism of diaphragm pipe is mainly：Velocity field and concentration field are small
The low characteristic in high both sides in the middle of being presented in flue.Part of smoke forms some small whirlpools between pipe and diaphragm in bottom flue simultaneously
Stream, forms stable adhesion layer in metal wall, makes soot particle to the reduction of metal impact ability, therefore, can be subtracted using diaphragm pipe
Light abrasion.But the rigidity of diaphragm pipe pipe row, elastic compensating ability are lower compared with light pipe, and wing surface area is far away from biography
The spiral finned tube of system, augmentation of heat transfer effect is poor.
In a word, existing extended surface tube design, is the serious shadow to sacrifice heat exchange area, reduction heat exchange efficiency as cost mostly
The high advantage of traditional extended surface tube heat transfer efficiency is rung.Therefore research and develop and a kind of not only can guarantee that heat exchange efficiency but also the new of polishing machine can be improved
Type fin tubular construction is particularly important.
The content of the invention
Technical problem：The technical problems to be solved by the invention are to be directed to above-mentioned the deficiencies in the prior art, and provide a kind of
On the premise of being meant to ensure that extended surface tube extended surface rate, improve the outer properties of fire smoke flow of heat exchanger tube, the local flue gas stream of reduction
Speed, so as to improve the extended surface tube of extended surface tube wear resistance and the heat exchanger with the extended surface tube.
Technical scheme：The present invention the used technical scheme that solves the above problems is as follows:
A kind of wear-resistant extended surface tube, including base tube and the fin for being arranged on the base tube outer surface, it is characterised in that：
The drainage trough of a upper end open is provided with the fluoran stream surface of the fin, the height of the drainage trough is high for 1/2 ~ 4/5 wing, drainage trough
Width be the base tube diameter 1/6 ~ 1/4.
The fin is spaced apart parallel fins or spiral fin.
The drainage trough is rectangular channel.
The drainage trough is arranged on the center of the fluoran stream surface.
A kind of heat exchanger, using the extended surface tube of any of the above-described scheme.
The present invention sets drainage trough on the fluoran stream surface of fin, and such fin tubular construction can both ensure changing for extended surface tube
The thermal efficiency, can improve the flow field situation that flue gas flows through extended surface tube so that fluoran stream surface flue gas flows through at fluting, is washing away tube wall again
When certain axial velocity is formed near wall, have obvious area with traditional spiral finned tube or the circular extended surface tube situation of streaming
Not, the motion conditions of dust granules, therewith by very big change, originally bypassed fin direct collision wall in fluoran stream surface flue gas
A part of particle scattered at fluting with certain axial component velocity, this motion conditions can be substantially reduced particle to wall
Rate of depreciation.
Beneficial effect：It is of the invention to be had the following advantages compared with existing extended surface tube：
1. heat exchange efficiency is high.The extended surface area slotted on spiral or circular extended surface tube fluoran stream surface fin to extended surface tube
Influence is little, remains the big advantage of extended surface tube heat exchange area.
, can be according to the height of base tube size adjusting drainage trough 2. the present invention is in the case where ensureing the principle on fin largest extension surface
Degree and width, highly high in 1/2 ~ 4/5 wing, width is the 1/6 ~ 1/4 of the base tube diameter, original direct collision base tube wall
Particle is scattered at the fluting of base tube upper end certain distance with certain axial component velocity so that the formation of nearly base tube wall has one
The deceleration face of fixed axial velocity, hinders and reduces the stream of nearly base tube wall directly being served from the flue gas passed through fin
Speed, is not only distributed to the reduction of flue gas flow rate into planar, and with the circular anastomosis of base tube so that flue gas is rushed to base tube surface
Brush speed is more uniform, so as to be effectively improved conventional helical extended surface tube or circular extended surface tube abrasion condition, abrasion resistant qualities are better than H
Type extended surface tube.Simultaneously because fin of the present invention is circular arc, fin wear resistance is more more obvious than H type extended surface tube advantages.
3. the present invention can use two kinds of arrangement forms of in-line and stagger arrangement when heat exchanger tube is arranged, rather than H type fins
Pipe like that can only in-line arrangement, heat exchange efficiency height, using more flexible.
H types extended surface tube due between different pipes are arranged spacing of fin it is small, the reason such as fin is thicker can only use in-line arrangement,
And in-line arrangement heat-transfer surface heat transfer property is poor, required heat exchange area and arrangement space are bigger, and cost of equipment is high.Circular extended surface tube and
The extended surface tube of screw type extended surface tube and the present invention with drainage trough can use in-line arrangement as H type extended surface tubes, but more
Many is to use to be staggered in arrangement.It is staggered in arrangement heat-transfer surface heat transfer efficiency high, facility compact, arrangement space is small, and little space can
Huge heat is reclaimed, and great deal of steel is saved than in-line arrangement heat-transfer surface, cost of equipment is low.
Brief description of the drawings
Fig. 1 is the schematic diagram of c-type spiral finned tube of the present invention.
Fig. 2 is Fig. 1 profile.
Fig. 3 is the schematic diagram of the circular extended surface tube of c-type of the present invention；
Fig. 4 is Fig. 3 profile；
Fig. 5 is the schematic diagram of prior art spiral finned tube；
Fig. 6 is Fig. 5 profile；
Fig. 7 is the schematic diagram of prior art H type extended surface tubes；
Fig. 8 is Fig. 7 profile；
Fig. 9 is the schematic diagram of the circular extended surface tube of prior art；
Figure 10 is Fig. 9 profile；
Figure 11 is the extended surface tube fluoran stream surface rate of depreciation distribution map of embodiment one；Wherein：A, spiral finned tube, b, H type fin
Pipe, c, c-type spiral finned tube；
Figure 12 is the base tube fluoran stream surface rate of depreciation distribution map of embodiment one；
Figure 13 is the fin fluoran stream surface rate of depreciation distribution map of embodiment one；
Figure 14 is the base tube fluoran stream surface velocity contour of embodiment one；
Figure 15 is the extended surface tube fluoran stream surface rate of depreciation distribution map of embodiment two；Wherein：A, circular extended surface tube, b, c-type are circular
Extended surface tube；
Figure 16 is the base tube fluoran stream surface rate of depreciation distribution map of embodiment two；
Figure 17 is the fin fluoran stream surface rate of depreciation distribution map of embodiment two；
Figure 18 is the base tube fluoran stream surface velocity contour of embodiment two；
In figure：1st, base tube, 2, drainage trough, 3, fin.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is elaborated：
The present invention is a kind of extended surface tube, is mainly used in boiler heat-exchanger.
Embodiment one
Shown in Fig. 1, Fig. 2.Extended surface tube of the present invention, including base tube 1 and fin 3, wherein 1 is base tube, fin 3 is spiral fin
Piece.The drainage trough 2 of rectangle is offered on the fluoran stream surface of helix fin, is similar to c-type, in the present embodiment, the height of drainage trough
Spend for wing it is high 2/3, the width of drainage trough is the 1/5 of base tube diameter, and the helix fin of fluting is welded on base tube 1, or will
The fin 3 of existing spiral finned tube carries out slot treatment.
Using Fluent business softwares to certain physical dimension conventional helical extended surface tube（Fig. 5, Fig. 6）, H type extended surface tubes（Fig. 7,
Fig. 8）And the fluting spiral finned tube of the present invention（Fig. 1, Fig. 2）Outside flow of flue gas carries out numerical simulation：
The outer flue gas flow rate of extended surface tube is 6m/s, is flowed along x-axis positive direction.For conventional helical extended surface tube, H types extended surface tube and
C-type spiral finned tube of the present invention, simulates obtained fluoran stream surface rate of depreciation and is illustrated in Figure 11.
As seen from Figure 11, with sweep of gases extended surface tube is flowed, there is certain journey in three kinds of cast extended surface tubes in fluoran stream surface
The abrasion of degree.Wear and tear substantially more serious than H types extended surface tube and c-type spiral finned tube on conventional helical extended surface tube base tube, its speed of wearing and tearing
Rate is more than 1.0 × 10-10kg/(m2S) area accounts for the 2.86% of the base tube gross area；H type extended surface tubes rate of depreciation is more than 1.0
×10-10kg/(m2S) area accounts for the 0.78% of the base tube gross area, and c-type spiral finned tube base tube rate of depreciation is more than 1.0
×10-10kg/(m2S) area accounts for the 0.71% of the base tube gross area, and 75% is reduced than conventional helical extended surface tube, than H type fins
Pipe reduces about 9%.
Fin rate of depreciation is counted, the rate of depreciation of H type extended surface tube fins is more than 1.0 × 10-10kg/(m2·s)
Area account for the 1.22% of the fin gross area；The rate of depreciation of conventional helical extended surface tube fin is more than 1.0 × 10-10kg/(m2·
S) area accounts for the 0.61% of the fin gross area, and c-type spiral finned tube fin rate of depreciation of the present invention is more than 1.0 × 10-10kg/
(m2S) area accounts for the 0.75% of the fin gross area, and 38.5% is reduced than H type pipes.
Further base tube rate of depreciation is analyzed, conventional helical extended surface tube, H types extended surface tube and c-type fin of the present invention
The fin central cross-section fluoran stream surface lateral wearing rate distributing curve of pipe two is shown in Figure 12, as can be seen that conventional helical type fin from figure
Piece pipe maximum wear rate is about 1.6 × 10-10kg/(m2S), H types extended surface tube maximum wear rate is about 9 × 10-11kg/
(m2S), present invention fluting spiral finned tube maximum wear rate is about 1.0 × 10-10kg/(m2S), than conventional helical type fin
Piece pipe is low by about 37.5%, roughly the same with H type extended surface tube maximum wear rates.
It is distributed using rate of depreciation on the c-type spiral finned tube, conventional helical extended surface tube, H type extended surface tube fins of the present invention
Curve is shown in Figure 13.As can be seen that maximum wear rate is about 1.6 × 10 on H type extended surface tube fins from figure-10kg/(m2·
S), maximum wear rate is about 8 × 10 on conventional helical extended surface tube fin-11kg/(m2S), c-type helix fin of the present invention
Pipe is close with conventional helical extended surface tube fin rate of depreciation, lower by about 50% than H type extended surface tube maximum wear rates.
Along x to（That is fluid flow direction）Fluoran stream surface, at the 1mm of base tube surface, the edge in a spacing of fin
The VELOCITY DISTRIBUTION of pipe axial direction is illustrated in Figure 14.It is seen from figure 14 that c-type spiral finned tube of the present invention and conventional helical fin
VELOCITY DISTRIBUTION is in the low trend in middle high both sides between the fin of pipe two, i.e., speed is relatively low at close fin, and between two fins center
Region flow velocity is higher；Conventional helical extended surface tube central area Peak Flow Rate is about 1.78m/s, c-type extended surface tube center of the present invention
Domain Peak Flow Rate is about 1.21m/s, lower than conventional helical extended surface tube by about 32%.H type extended surface tube VELOCITY DISTRIBUTIONs are more uniform, close to wing
With central area difference less, average speed is about 1.06m/s to panel region.As can be seen here, c-type spiral finned tube of the present invention is opened
Groove can substantially reduce speed of incoming flow so that the speed of particles hit base tube reduces, so as to alleviate extended surface tube abrasion.
Therefore, compared with conventional helical fin, c-type spiral finned tube of the present invention significantly reduces the abrasion of fluoran stream surface base tube
Speed, improves extended surface tube wearing character so that the stability of extended surface tube work is guaranteed.
Meanwhile, compared with H type extended surface tubes, the rate of depreciation of c-type spiral finned tube fin of the present invention is also lower, combines biography
Advantage in terms of system spiral finned tube fin and H type extended surface tube base tube polishing machinees.
Embodiment two
Shown in Fig. 3, Fig. 4.The circular extended surface tube of c-type of the present invention, including base tube 1 and fin 3, wherein 1 is base tube, fin 3 is
Circular parallel fins.The drainage trough 2 of rectangle, in the present embodiment, the height of drainage trough are offered on the fluoran stream surface of helix fin
Spend for wing it is high 4/5, the width of drainage trough is the 1/5 of base tube diameter.Simulation obtains the circular extended surface tube of c-type of the present invention and traditional round
Shape extended surface tube（Fig. 9, Figure 10）Base tube fluoran stream surface rate of depreciation be illustrated in Figure 15.
As seen from Figure 15, the circular extended surface tube base tube rate of depreciation of c-type of the present invention is less than typical round extended surface tube, eroded area
Again smaller than typical round extended surface tube.Base tube rate of depreciation is counted, H type extended surface tubes rate of depreciation is more than 1.0 × 10-10kg/
(m2S) area accounts for the 0.78% of the base tube gross area, and typical round extended surface tube rate of depreciation is higher than 1.0 × 10-10kg/(m2·
S) area accounts for the 1.52% of the base tube gross area, and c-type circle extended surface tube rate of depreciation is higher than 1.0 × 10-10kg/(m2S)
Area accounts for the 0.33% of the base tube gross area.The circular extended surface tube serious wear region of c-type of the present invention is only typical round extended surface tube
78.3%, reduce 57.7% than H type extended surface tubes.
Fin rate of depreciation is counted, H type extended surface tube fins rate of depreciation is more than 1.0 × 10-10kg/(m2S)
Area accounts for the 1.22% of the fin gross area；Typical round extended surface tube fin rate of depreciation is more than 1.0 × 10-10kg/(m2S)
Area accounts for the 1.66% of the fin gross area, and the circular extended surface tube fin rate of depreciation of c-type of the present invention is more than 1.0 × 10-10kg/
(m2S) area accounts for the 0.39% of the fin gross area, lower than typical round extended surface tube by 76.51%, is reduced than H type pipes
68.03%。
Further base tube rate of depreciation is analyzed, typical round extended surface tube, H types extended surface tube and c-type of the present invention are circular
The fin central cross-section fluoran stream surface lateral wearing rate distributing curve of extended surface tube two is shown in Figure 16, as can be seen that typical round from figure
Extended surface tube maximum wear rate is about 1.51 × 10-10kg/(m2S), H types extended surface tube maximum wear rate is about 9 × 10- 11kg/(m2S), the circular extended surface tube maximum wear rate of c-type of the present invention is about 8.5 × 10-11kg/(m2S), conventional helical is compared
Type extended surface tube is low by about 43.7%, lower by 5.6% than H type extended surface tube maximum wear rates.
It is distributed using rate of depreciation on the c-type spiral finned tube, conventional helical extended surface tube, H type extended surface tube fins of the present invention
Curve is shown in Figure 17, as can be seen that maximum wear rate is about 1.66 × 10 on H type extended surface tube fins from figure-10kg/(m2·
S), maximum wear rate is about 1.56 × 10 on typical round extended surface tube fin-10kg/(m2S), the circular fin of c-type of the present invention
Maximum wear rate is about 1.25 × 10 on piece pipe fin-10kg/(m2S), it is lower about than H type extended surface tube maximum wear rates
24.7%, it is lower than typical round finned tube by about 19.9%.
Along x to（That is fluid flow direction）Fluoran stream surface, at the 1mm of base tube surface, the edge in a spacing of fin
The VELOCITY DISTRIBUTION of pipe axial direction is illustrated in Figure 18.As can be seen from Figure 18, circular extended surface tube is close to flow field velocity near fin
Smaller, larger in two fin center flow field velocities, Peak Flow Rate is about 1.64m/s.C-type circle extended surface tube and H type extended surface tubes
More uniform close to Flow Field Distribution at base tube due to the fluting of fin, H types extended surface tube is 1.065m/ away from average speed at base tube 1mm
S, c-type circle extended surface tube maximal rate is 1.22m/s, lower than typical round extended surface tube by about 25.6% so that c-type circle extended surface tube
Base tube rate of depreciation is lower than typical round extended surface tube.
Therefore, compared with typical round fin, the circular extended surface tube of c-type of the present invention significantly reduces fluoran stream surface base tube and fin
Rate of depreciation, improve extended surface tube wearing character so that extended surface tube work stability be guaranteed.
Claims (2)
1. a kind of wear-resistant extended surface tube, including base tube and the fin for being arranged on the base tube outer surface, it is characterised in that：Institute
The drainage trough that a upper end open is provided with the fluoran stream surface of fin is stated, the height of the drainage trough is high for 1/2 to 4/5 wing, drainage trough
Width be the 1/6 ~ 1/4 of the base tube diameter, the drainage trough is rectangular channel, and the drainage trough is arranged on the fluoran stream surface
Center, the fin be spaced apart parallel fins or spiral fin, it is described to draw using in-line or the arrangement form of stagger arrangement
Chute by the particle of original direct collision base tube wall at the fluting of base tube upper end certain distance with certain axial component velocity
Scatter and cause nearly deceleration face of the base tube wall formation with certain axial velocity, directly being played from the flue gas passed through fin
Hinder and reduce the flow velocity of nearly base tube wall, the reduction to flue gas flow rate is not only distributed into planar, and with the circle of base tube
Shape is coincide so that flue gas is more uniform to the eroding velocity on base tube surface.
2. a kind of heat exchanger, it is characterised in that including the wear-resistant extended surface tube described in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510489236.0A CN105021080B (en) | 2015-08-11 | 2015-08-11 | Wear-resistant extended surface tube and heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510489236.0A CN105021080B (en) | 2015-08-11 | 2015-08-11 | Wear-resistant extended surface tube and heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN105021080A CN105021080A (en) | 2015-11-04 |
| CN105021080B true CN105021080B (en) | 2017-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510489236.0A Expired - Fee Related CN105021080B (en) | 2015-08-11 | 2015-08-11 | Wear-resistant extended surface tube and heat exchanger |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105920960B (en) * | 2016-06-15 | 2019-11-15 | 高境 | Remove the method and system of fine particle in degassing sol |
| CN108955322B (en) * | 2017-05-18 | 2023-10-20 | 华北理工大学 | Multilayer acute angle diaphragm type wall vibration high-efficiency particle heat exchange device that turns back |
| CN110906777B (en) * | 2019-11-29 | 2021-04-20 | 西安交通大学 | Slotted fin heat exchange tube with twisted fin end |
| CN113108638A (en) * | 2021-04-02 | 2021-07-13 | 西安交通大学 | Integrated fin with triangular winglets |
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| CN101344365A (en) * | 2008-08-18 | 2009-01-14 | 青州飞达动力机械有限公司 | Cold rolling pipe type heat exchange element |
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| CN204963640U (en) * | 2015-08-11 | 2016-01-13 | 江苏龙净环境科技有限公司 | Extended surface tube and heat exchanger resistance to wear |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6101055B2 (en) * | 2012-11-22 | 2017-03-22 | 三菱アルミニウム株式会社 | Method for producing aluminum fin material for heat exchanger |
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| CN2572324Y (en) * | 2002-09-28 | 2003-09-10 | 江苏萃隆铜业有限公司 | Heat exchanging pipe for evaporator |
| CN101216269A (en) * | 2007-12-26 | 2008-07-09 | 东莞理工学院 | Rectangular offset strip fin heat transfer pipe and uses thereof |
| CN101344365A (en) * | 2008-08-18 | 2009-01-14 | 青州飞达动力机械有限公司 | Cold rolling pipe type heat exchange element |
| CN202133317U (en) * | 2011-06-09 | 2012-02-01 | 东方日立锅炉有限公司 | H-shaped fin for fin tube heat exchanger |
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| CN105021080A (en) | 2015-11-04 |
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