CN109945688A - A kind of high-efficiency heat exchanger equipment based on Dean Vortice effect - Google Patents
A kind of high-efficiency heat exchanger equipment based on Dean Vortice effect Download PDFInfo
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- CN109945688A CN109945688A CN201910200328.0A CN201910200328A CN109945688A CN 109945688 A CN109945688 A CN 109945688A CN 201910200328 A CN201910200328 A CN 201910200328A CN 109945688 A CN109945688 A CN 109945688A
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Abstract
The invention discloses a kind of high-efficiency heat exchanger equipments based on Dean Vortice effect.The high-efficiency heat exchanger equipment successively includes shell, cooling medium inlet, cooling medium outlet, processing medium outlet, processing medium import and spiral heat exchange tube etc..Fluid media (medium) will form the Dean Vortice with the distribution of symmetrical vortex core when flowing in spiral heat exchange tube, have great influence for fluid heat transfer.By the way that Dean Vortice intensity is analyzed and evaluated with heat exchange efficiency, choose Dean Vortice intensity index corresponding to optimal heat exchange efficiency, the structural parameters of optimization design heat exchanger tube, so that reaching abundant turbulence state under conditions of lesser resistance and linear loss when fluid media (medium) flows in tube side, near-wall flow boundary layer and temperature boundary layer thickness is effectively reduced, reinforce the active convective heat transfer process during media flow, improves equipment overall operation efficiency.Meanwhile near-wall fouling and impurity deposition are destroyed, ensure equipment high efficiency, economy, safe long-term operation.
Description
Technical field
The present invention relates to process fluid flows actively to enhance technical field of heat exchange, relates more specifically to a kind of based on Dean
Vortice Secondary Flow actively enhances the high-efficiency helical heat exchange equipment of heat transfer effect, which can be widely applied to petroleum, changes
Fluid heat transfer process in the fields such as work, light industry, sewage treatment.
Background technique
Heat exchange equipment is the common processes unit for carrying out heat exchange, is widely used in chemical industry, oil refining, power, light industry, smelting
The industrial departments such as gold, nuclear energy, shipbuilding, aviation, building, metal consumption, power consumption and construction investment account in entire engineering
There is sizable share.Therefore, the runnability of heat exchange equipment and working efficiency directly affect the whole device even peace of enterprise
Steady operation and economic benefit.With increasingly sharpening for world energy sources crisis, scarcity of resources and energy shortage are to industrial production and warp
Ji development brings severe challenge.Energy utilization rate is effectively improved, enhancing equipment heat exchange efficiency becomes each relevant departments and urgently solves
Major issue certainly.
By rate of heat transfer equation Q=KA Δ T it is found that by improving heat transfer coefficient, increasing heat exchange area and raising
Heat transfer temperature difference can effectively improve the operational efficiency of heat exchange equipment.For pipe shell type heat exchange equipment, improving tube side velocity of medium can
The turbulent flow stagnant area in flow field is eliminated, flow disturbance and mixed effect are increased, improves the heat exchange efficiency of equipment to a certain extent.But
Simple raising velocity of medium will lead to flow resistance increase, and equipment energy consumption sharply increases.Increasing heat exchange area is to strengthen shell
One of the important channel of formula heat exchange equipment performance, increases heat-transfer area by using small diameter tube heat exchanger tube and extended surface heat-transfer area
Product, but this method often leads to equipment volume, technological facilities and investment etc. and increases therewith, constrains its chemical industry fixed in place
Extensive use in system.Increase a kind of effective ways that mean temperature difference is also enhanced heat exchange equipment heat exchange property, mainly
It is arranged using various heat exchange face to change mean temperature difference, or expands the method increase of the cold and hot fluid inlet and outlet temperature difference averagely
Heat transfer temperature difference, but this method is usually limited by production process and economic condition etc. in implementation process, and effect is limited.In addition,
Often using the elements such as insertion spinning disk, spiral band in pipe in industrial application, developing it sufficiently is turbulent flow, while being cooperated all kinds of
Shell-side enhancement techniques technology, such as baffle plate/bar, special-shaped orifice plate, cavity ring measure, enhanced heat exchange equipment can run to a certain extent
Efficiency, but typically result in higher flow resistance and operating cost.
Summary of the invention
The present invention provides a kind of high-efficiency heat exchanger equipments based on Dean Vortice effect.By to medium flow field in tube side
The Dean Vortice that dynamic process generates is analyzed and is optimized, and is designed and is constructed spiral tube structure size and operating parameter, make
Fluid media (medium) reaches abundant turbulence state under lower flow conditions, reduces temperature boundary layer and flow-boundary-layer thickness, effectively
Heat exchange equipment operational efficiency is improved, realizes equipment high efficiency, energy conservation, economy, safe long-term operation.
In order to achieve the above object, the technical solution adopted by the present invention is that:
A kind of high-efficiency heat exchanger equipment based on Dean Vortice effect successively includes shell, cooling medium inlet, cooling
Media outlet, processing medium outlet, processing medium import and spiral heat exchange tube.The cooling medium inlet is located under shell
Side, the cooling medium outlet are located on the upside of shell.Processing medium import is located at case top, and processing medium outlet is located at shell
Downside.Spiral heat exchange tube is located in shell, and cooling medium enters shell by import, and heat occurs with spiral heat exchange tube and exchanges
Shell is flowed out by outlet.Processing medium is entered in spiral heat exchange tube by import, through outlet stream exit spiral type heat exchanger tube.
Further, the spiral heat exchange tube radius of curvature R meets:
Wherein, Q is the mass flow of apparatus and process medium, and r is spiral heat exchange tube inside radius, and ρ is processing medium density,
ν is processing medium kinematic viscosity, DeFor Dean Vortice intensity.
Further, the DeIt is 2100.
Further, the inside radius r of the spiral heat exchange tube and radius of curvature R meet:
r/R≤0.16 (2)
Further, the spiral heat exchange tube interlamellar spacing h meets:
H=4r (3)
Further, the torsion rate τ of the spiral heat exchange tube meets:
The π r/ of τ=2 (R2π2+4r2) (4)
Further, the cooling medium inlet, cooling medium outlet, processing medium outlet, processing medium import are logical
Welding form is crossed to connect with shell.
The invention has the advantages that:
A kind of high-efficiency heat exchanger equipment based on Dean Vortice effect proposed by the present invention, using Secondary Flow analysis side
Method, choose heat exchange efficiency it is optimal when corresponding Dean Vortice intensity index, optimization design heat exchange tube structure parameter makes technique
Medium reaches the state of abundant turbulent flow in tube side under conditions of smaller resistance and linear loss, is effectively reduced near inside pipe wall
Flow boundary layer and temperature boundary layer thickness improve heat exchange equipment operational efficiency.Meanwhile ensureing processing medium in tube side flow
With stronger wall surface shear action, the fouling and impurity that can effectively destroy at wall surface are deposited, prevent heat exchanger tube generation from blocking,
Deposit attack influences heat exchange equipment overall operation safety.The present invention is based on the Secondary Flows in heat exchange equipment critical component-heat exchanger tube
Phenomenon, the key parameters such as radius, radius of curvature, screw pitch, the torsion rate of optimization design heat exchanger tube, it is whole can to effectively improve heat exchange equipment
Running body efficiency ensures equipment high efficiency, economy, safe long-term operation.
Detailed description of the invention
Fig. 1 high-efficiency heat exchanger equipment structural schematic diagram；
Fig. 2 spiral heat exchange tube structural schematic diagram；
The influence of Fig. 3 Dean Vortice intensity exchange thermal efficiency；
The influence of Fig. 4 r/R exchange thermal efficiency.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, a kind of high-efficiency heat exchanger equipment based on Dean Vortice effect provided by the present invention, including shell
Body, cooling medium inlet, cooling medium outlet, processing medium import, processing medium outlet and spiral heat exchange tube.It is cooling to be situated between
Matter, processing medium flow separately through shell side and tube side, and equipment is flowed out after heat convection.
As shown in Fig. 2, being spiral heat exchange tube of the invention.Wherein, radius of curvature R meets:
Q is the mass flow of apparatus and process medium, and r is helix tube inside radius, and ρ is processing medium density, and ν is processing medium
Kinematic viscosity, DeFor Dean Vortice intensity, by Fig. 3 result of study it is found that DeWhen being 2100, heat exchanger tube has optimal change
Thermal effect.
The mass flow of apparatus and process medium is obtained, then flowing velocity V=Q/A of the medium in tube side, wherein A is to be situated between
Matter flow area meets A=π r2。
Turbulent extent R of the processing medium in tube sideeIt indicates, meets formula Re=Vd/ ν, wherein d is characterized length,
Referred to herein as exchange heat bore.
When processing medium flows in tube side, due to being acted on by centrifugal force, Secondary Flow, intensity D can be generatedeIt indicates,
Shown in being defined as follows:
De=Re·(r/R)0.5=2rV ν-1·(r/R)0.5
If DeToo small, then the Secondary Flow degree of swirl formed is weaker, cannot be effectively reduced near-wall flow boundary layer and
The thickness of temperature boundary layer, enhanced heat transfer effect are weaker；If DeExcessive, then the Secondary Flow vortex core formed will crumble and fall, equally
The heat exchange efficiency that equipment cannot be improved also results in biggish flow resistance.
Spiral heat exchange tube inside radius r and radius of curvature R meet constraint condition r/R≤0.16, ensure equipment high efficiency rate fortune
There is biggish economy under conditions of row.If r/R is greater than 0.16, pressure drop pushes the speed far faster than anger Sai Erte number in pipe
Growth rate causes augmentation of heat transfer effect quickly to reduce.
Spiral heat exchange tube screw pitch h is generally 3r~4r, for the high-efficiency heat exchanger equipment, defines h=4r, reduces technique
The on-way resistance of media flow process ensures that it, with biggish vertical speed, forms stronger boundary shear stress, destroys
Fouling and impurity at tube wall deposit, and prevent tube side blocking and deposit attack.
Spiral heat exchange tube torsion rate τ meets condition: the π r/ of τ=2 (R2π2+4r2).The condition can enhance processing medium in tube side
It is formed by boundary shear stress when middle flowing, further decreases temperature boundary layer thickness, enhanced heat exchange prevents fouling and impurity heavy
Product.
Cooling medium inlet, cooling medium outlet, processing medium import, processing medium outlet pass through welding form and shell
Body connection ensures that equipment has good leakproofness.
Above-mentioned specific embodiment is used to explain the present invention, rather than limits the invention, in spirit of the invention
In scope of protection of the claims, to any modifications and variations that the present invention makes, protection scope of the present invention is both fallen within.
Embodiment
Heat exchange equipment is the base unit of heat exchange, is widely used in petroleum, chemical industry, light industry, nuclear power, ship, aviation
Equal industrial circles, account for the important proportion of business equipment investment.With increasingly sharpening for world energy sources crisis, effectively improves heat exchange and set
Received shipment line efficiency causes the great attention of related fields expert and scholar, and various heat transfer enhancement technologies is caused to be grown rapidly.
Currently, the more intensified heat transfer method of industrial application mainly includes managing interior element method, shell side flow-disturbing method, rough surface method, outside
Vibratory drilling method etc., enhances the operational efficiency of heat exchange equipment to a certain extent, but typically results in higher flow resistance and operation
Cost.
The present invention provides a kind of high-efficiency heat exchanger equipments based on Dean Vortice effect.By being flowed through to processing medium
It is formed by Dean Vortice phenomenon when tube side to be analyzed, studies Dean Vortice intensity index for enhanced heat exchange
The influence of effect, the structural parameters of optimization design spiral heat exchange tube make processing medium when flowing in tube side in lesser stream
It can reach abundant turbulence state under the conditions of dynamic resistance and linear loss, while certain wall surface formed to tube wall and is sheared, effectively
Flow boundary layer and temperature boundary layer thickness are reduced, the operational efficiency of heat exchange equipment is improved, prevents fouling and impurity from depositing and generates.
In order to evaluate heat exchange equipment provided by the present invention for the effect of enhancing heat exchange, enhancing heat exchange evaluation points η is introduced to enhancing
Heat transfer effect is evaluated, and is defined as follows shown:
η=(Nu/Nu0)/(f/f0)1/3
Wherein, NuFor the nusselt number to test tube, Nu0For the nusselt number for comparing pipe, f is to test tube flow resistance, f0
To compare pipe flow resistance.NuShown in being defined as follows:
Nu=KL/ λ
Wherein, K is convective heat-transfer coefficient, and L is characterized length, and λ is flow thermal conductivity coefficient.
Experimental rig is built, mainly by constant temperature water tank, water pump, shut-off valve, pressure-measuring pipe, thermometer, temperature controller, heating
The parts such as device, sink, connecting tube, heat exchanger tube to be measured, comparison pipe form.
Measurement is to test tube entry and exit temperature TO、Ti, mass flow m and pipe range L flow through band by following equation calculating
The mean heat flux q of observing and controlling pipe,
Q=Cm (To-Ti)/(π·d·L)
Pass through formula K=q/ (Tw-Tf), it obtains to test tube convection transfer rate K.T in experimentwFor constant, TfFor medium
Mean temperature is approximately the half of the sum of entry and exit temperature.
The difference Δ P of measurement experiment pipe inlet and outlet pressure, and interior mean flow rate V is managed, pass through following equation and obtains stream in pipe
Hinder f:
F=2d Δ P/ (ρ V2·L)
The calculation formula that above-mentioned parameter is substituted into enhancing heat exchange evaluation points η, obtains the enhancing of heat exchanger tube under every kind of operating condition
Heat transfer effect, as a result as shown in Figure 3, Figure 4.Through analyzing, under various working conditions, DeEnhanced heat transfer effect when being 2100 reaches
To highest；When r/R≤0.16, the enhanced heat transfer effect of spiral heat exchange tube is preferable.Therefore, the present invention is based on spiral heat exchange tubes
In Dean Vortice effect, a kind of high-efficiency heat exchanger equipment provided can utilize Flow Field Distribution of the fluid in helix tube
Feature makes fluid under conditions of smaller resistance and linear loss, by active enhanced heat exchange process, effectively improves heat exchange equipment
Operational efficiency, ensure equipment high efficiency, economy, stablize long-term operation.
Claims (7)
1. a kind of high-efficiency heat exchanger equipment based on Dean Vortice effect, successively include shell (1), cooling medium inlet (2),
Cooling medium exports (3), processing medium outlet (4), processing medium import (5) and spiral heat exchange tube (6).The cooling medium
Import (2) is located on the downside of shell (1), and the cooling medium outlet (3) is located on the upside of shell (1).Processing medium import (5) is located at
At the top of shell (1), processing medium outlet (4) is located on the downside of shell (1).Spiral heat exchange tube (6) is located in shell (1)；It is cooling
Medium enters shell (1) by import (2), occurs to be exported (3) outflow shell (1) after heat exchanges with spiral heat exchange tube (6).
Processing medium is entered in spiral heat exchange tube (6) by import (5), is exported (4) outflow spiral heat exchange tube (6).
2. high-efficiency heat exchanger equipment according to claim 1, which is characterized in that spiral heat exchange tube (6) radius of curvature R
Meet:
Wherein, Q is the mass flow of apparatus and process medium, and r is spiral heat exchange tube inside radius, and ρ is processing medium density, and ν is
Processing medium kinematic viscosity, DeFor Dean Vortice intensity.
3. high-efficiency heat exchanger equipment according to claim 2, which is characterized in that DeIt is 2100.
4. high-efficiency heat exchanger equipment according to claim 1, which is characterized in that r in the radius of the spiral heat exchange tube (6)
Meet with radius of curvature R:
r/R≤0.16 (2)。
5. high-efficiency heat exchanger equipment according to claim 1, which is characterized in that spiral heat exchange tube (6) the interlamellar spacing h is full
Foot:
H=4r (3).
6. high-efficiency heat exchanger equipment according to claim 1, which is characterized in that the torsion rate τ of the spiral heat exchange tube (6) is full
Foot:
The π r/ of τ=2 (R2π2+4r2) (4)。
7. high-efficiency heat exchanger equipment according to claim 1, which is characterized in that the cooling medium inlet (2), cooling medium
Outlet (3), processing medium outlet (4), processing medium import (5) are connect by welding form with shell (1).
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| US4343350A (en) * | 1978-08-04 | 1982-08-10 | Uop Inc. | Double wall tubing assembly and method of making same |
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| CN101266106A (en) * | 2008-05-09 | 2008-09-17 | 山东大学 | Spatially spiral elasticity-intensified heat exchange tube bundle and its supporting device |
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| US4343350A (en) * | 1978-08-04 | 1982-08-10 | Uop Inc. | Double wall tubing assembly and method of making same |
| JPS5811386A (en) * | 1981-07-13 | 1983-01-22 | Hajime Miyata | Heat exchanger |
| CN101266106A (en) * | 2008-05-09 | 2008-09-17 | 山东大学 | Spatially spiral elasticity-intensified heat exchange tube bundle and its supporting device |
| CN101514880A (en) * | 2009-03-26 | 2009-08-26 | 重庆大学 | Spiral heat exchange tube |
| CN202304497U (en) * | 2011-09-15 | 2012-07-04 | 上海奥格利环保工程有限公司 | Sulfuric acid analyzing acid cooler |
| CN102589339A (en) * | 2012-03-21 | 2012-07-18 | 刘滕军 | Pure titanium heat exchanger with titanium pipes passing in and out vertically |
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| 张晋凯，李根生，黄中伟，田守嶒，史怀忠，宋先知: "连续油管螺旋段摩阻压耗数值模拟", 《中国石油大学学报（自然科学版）》 * |
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Effective date of registration: 20190814 Address after: No. 168 Hongjiang Road, Chongchuan District, Nantong City, Jiangsu Province Applicant after: Nantong Haitkeler Heat Exchange Equipment Technology Co., Ltd. Address before: 210000 No. 216, 115 Hongqiao Street, Chongchuan District, Nantong City, Jiangsu Province Applicant before: Nantong Wending Heat Exchange Equipment Technology Co., Ltd. |
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Application publication date: 20190628 |
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