CN101762115A - Unsupported alternating curved tube dry type evaporator - Google Patents
Unsupported alternating curved tube dry type evaporator Download PDFInfo
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- CN101762115A CN101762115A CN200910214562A CN200910214562A CN101762115A CN 101762115 A CN101762115 A CN 101762115A CN 200910214562 A CN200910214562 A CN 200910214562A CN 200910214562 A CN200910214562 A CN 200910214562A CN 101762115 A CN101762115 A CN 101762115A
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Abstract
The invention discloses an unsupported alternating curved tube dry type evaporator, which comprises a refrigerant inlet, a refrigerant outlet, a chilled water inlet, a chilled water outlet, a first end socket, a second end socket, a first tube sheet, a second tube sheet, a shell, a clapboard, heat exchange tubes and a bundling steel belt, wherein the heat exchange tubes are alternating curved tubes, and a ratio of the twist range and the equivalent diameter of each heat exchange tube is 6-12; the ratio of the short shaft and the long shaft of the cross section of the heat exchange tube 9 is 0.5-0.7; and the alternating curved heat exchange tubes are sequentially contacted with each other to be arranged, and are supported by self to form tube bundles depending on each contact point of the alternating curved tubes. The invention strengthens the turbulence degree of fluid in the tubes so that the fluid in the tubes can be fully mixed and the boundary layer is reduced, and strengthens the heat transfer. A shell side is not provided with baffles and can realize self supporting depending on the mutual contact of the alternating curved tubes, the fluid flows among the tubes are uniform, flow dead zones are eliminated, fouling deposit of the shell side is reduced, the heat transfer efficiency is improved, the service life of equipment is prolonged, and production cost is lowered.
Description
Technical field
The present invention relates to a kind of dry evaporator, the unsupported alternating curved tube dry type evaporator of particularly a kind of tube bank.
Background technology
In big-and-middle-sized handpiece Water Chilling Units, topmost heat exchanger form is a shell and tube exchanger.Shell and tube exchanger mainly contains two kinds of dry type and flooded type.The flooded type heat exchanger more and more receives an acclaim owing to have higher heat exchanger performance, but the oil return problem that its fatal shortcoming is a unit, and one side has increased the cost of unit, has reduced the reliability of unit on the other hand.Dry evaporator technology than flooded type is then ripe a lot.Traditional dry evaporator still is present industrial widely used heat exchanger, an one key character is that shell side is established hydraulic barrier, to support heat exchanger tube and to strengthen the shell-side fluid disturbance, have simple in structure, be easy to processing, clean, can adapt to characteristics such as HTHP.The part but this shell-and-tube heat exchanger also comes with some shortcomings mainly is: the first, and heat exchanger tube adopts pipe, and under the lower condition of velocity in pipes, the boundary layer thermal resistance is bigger, and heat transfer coefficient is low; And under the flow velocity conditions of higher, flow resistance is bigger in the pipe.The second, there is flow dead in traditional single segmental baffle heat exchanger at deflection plate and housing junction, causes fluid to turn round and round easily, has increased flow resistance, and has caused fouling easily, has reduced heat exchange efficiency.The 3rd, traditional single segmental baffle is difficult to cooperate with non-circular intensify heat transfer pipe, has greatly limited the augmentation of heat transfer The Application of Technology.These problems have had a strong impact on the heat transfer efficiency of traditional dry evaporator, and in order to improve its efficient, people constantly improve its structure, but the result is still undesirable.
Summary of the invention
The objective of the invention is to overcome deficiency and the shortcoming that traditional dry evaporator exists, adopt novel alternating curved heat exchanger tube, under the prerequisite that does not change shell and tube evaporator appearance integral structure, strengthening tube side and shell-side fluid conducts heat, eliminate flow dead and induced vibration, improve heat transfer efficiency, reduce cost energy savings.
Purpose of the present invention can realize by following technical measures:
This heat exchanger includes housing, be contained in tube bank, fixed tube sheet, end socket in the housing, tie up steel band, dividing plate.The alternating curved heat exchanger tube contacts arrangement successively, form some contact self supporting structure, deflection plate need be set in tube bank, tie up steel band along tube bank every the fixed range setting and fix the alternating curved heat exchanger tube, its spacing is determined according to heat exchanger tube quantity and length, alternating curved heat exchanger tube two ends keep the pipe form, fix with convenient and fixed tube sheet welding.Tube bank closely contacts no gap with housing.
During work, refrigerant enters tube bank from the tube bank inlet, rotational flow in tube bank, produce complicated separating and the strong disturbance that is mixed into main feature with periodic logistics, strengthened heat transfer, flow out through the tube bank outlet with rotation, chilled water enters housing from the shell side inlet, flow along the tube bank helical flow path, form the vertical flow-disturbing of rotation, strengthened heat transfer.
With respect to prior art, unsupported alternating curved tube dry type evaporator of the present invention has following advantage:
(1) adopts the alternating curved pipe, have the characteristics of two-sided strengthened heat transfer;
(2) because in the alternating curved pipe, fluid constantly changes along the tube wall flow direction, so the tube fluid heat transfer boundary layer is destroyed, has reduced the heat transmission resistance of tube fluid significantly;
(3) because the warp surface of alternating curved pipe is a continuously smooth, with respect to the intensify heat transfer pipe of other pattern, flow resistance is lower;
(4) the shell side spiral flow has strengthened the turbulivity of shell side greatly, has strengthened the shell side heat transfer;
(5) the shell side no baffle plate has been realized longitudinal stream, makes shell-side pressure drop reduce greatly; Owing to be evenly distributed, do not have flow dead simultaneously, effectively heat transfer area increases greatly;
(6) flow distribution and velocity ratio are more even, have eliminated the heat exchanger tube vibration problem;
(7) less scaling, thus maintenance cycle prolonged, reduced maintenance cost.
Description of drawings
Fig. 1 is a kind of structural diagrams intention of unsupported alternating curved tube dry type evaporator;
Fig. 2 is the heat exchanger tube multiple spot self supporting structure schematic diagram of alternating curved among Fig. 1; Wherein scheming a is the strong point of heat exchanger tube 0 ° of transverse windup-degree; Figure b is the strong point of heat exchanger tube 60 ° of transverse windup-degrees; C is the strong point of heat exchanger tube 120 ° of transverse windup-degrees;
Fig. 3 is that unsupported alternating curved tube structural representation of the present invention is adopted in tube bank among Fig. 1;
Fig. 4 is the A-A schematic cross-section of unsupported alternating curved tube among Fig. 3;
Fig. 5 is the B-B schematic cross-section of unsupported alternating curved tube among Fig. 3.
The specific embodiment
For further understanding the present invention, below in conjunction with accompanying drawing the present invention is further described, need to prove that the specific embodiment is not construed as limiting the scope of protection of present invention.
With reference to Fig. 1, a kind of unsupported alternating curved tube dry type evaporator comprises refrigerant inlet 1, refrigerant exit 2, chilled water inlet 3, chilled water outlet 4, first end socket 5, second end socket 12, first tube sheet 6, second tube sheet 11, housing 7, dividing plate 8, heat exchanger tube 9 and ties up steel band 10; Chilled water inlet 3, chilled water outlet 4 are located on the housing 7, and housing 7 two ends are respectively first tube sheet 6 and second tube sheet, 11, the first tube sheets 6 and second tube sheet 11 and are connected to form cavity with first end socket 5, second end socket 12 respectively; Refrigerant inlet 1 and refrigerant exit 2 all are located on first end socket 5, separate by dividing plate 8.As shown in Figure 3, heat exchanger tube 9 is the alternating curved pipe, and the alternating curved pipe is to be parent tube with the pipe, twists to form after flattening, and its cross section is oval, shown in Fig. 4,5.As shown in Figure 3, the ratio (S/de) of turning round journey and equivalent diameter of alternating curved pipe is 6～12, and wherein S is the journey of turning round of alternating curved pipe.Turn round the length that journey S is meant alternating curved pipe cross section alternating curved pipe when the alternating curved pipe rotates a circle, de is the equivalent diameter of alternating curved pipe.The minor axis of heat exchanger tube 9 cross section ellipses is 0.5～0.7 with the ratio (B/A) of major axis, and is shown in Figure 5 as Fig. 4, and wherein B is the minor axis length of alternating curved pipe cross section ellipse, and A is an alternating curved pipe cross section long axis of ellipse length.As shown in Figure 2, alternating curved heat exchanger tube 9 contacts arrangement successively, rely on each contact point self-supporting of alternating curved pipe to form tube bank, do not have the existence of deflection plate in the tube bank, no flow dead in the shell side is compared with traditional segmental baffle board heat exchangers, not only flow resistance reduces to some extent, the performance of resistive connection dirt improves a lot, and can overcome induced vibration, and reliability also increases; The transverse windup-degree is meant that transverse is along the anglec of rotation of alternating curved pipe in the cross section of alternating curved pipe, and wherein scheming a is the strong point of heat exchanger tube 0 ° of transverse windup-degree; Figure b is the strong point of heat exchanger tube 60 ° of transverse windup-degrees; C is the strong point of heat exchanger tube 120 ° of transverse windup-degrees; Heat exchanger tube 9 two ends are fixing by first tube sheet 6 and second tube sheet 11 respectively; Heat exchanger tube 9 is arranged in the tube bank that forms does not need to be provided with deflection plate, and tube bank is turned round journey every 5 and established and tie up steel band 10 and tie up tube bank, prevents that the alternating curved pipe scatters in the tube bank.Alternating curved pipe two ends remain the pipe form of certain-length, are convenient to first tube sheet 6 and the 11 coupling welding of second tube sheet fixing.Being provided with dividing plate 8 in cavity between first tube sheet 6 and first end socket 5 and the housing 7, with two chambeies. body is separated.
When rate of flow of fluid is higher, no matter be alternating curved pipe or light pipe, the turbulent extent of fluid all can aggravate and make the heat transfer boundary layer attenuate, and the advantage of unsupported alternating curved tube just is the attenuate boundary layer, therefore, compare with light pipe, when the rate of flow of fluid of shell side or tube side was big, the advantage of unsupported alternating curved tube just can't embody, through test determination, the suitable scope of application of unsupported alternating curved tube dry type evaporator: tube side reynolds number Re≤4500, shell side reynolds number Re≤8000.
In pipe, because the influence of alternating curved tubular construction, fluid enters mobile behind the alternating curved pipe and presents apparent in view rotational flow, this just type of flow, make the fluid in the pipe be able to abundant mixing, produce and complicated to separate and to be mixed into the strong disturbance of main feature, make tube fluid boundary layer attenuate, strengthened heat transfer with rotation and periodic logistics.Outside pipe, being sequentially arranged in of alternating curved pipe formed narrow spiral flow channel rule, that flow direction constantly changes between pipe, helical flow path can be regarded as the continuous short district of many groups, the stable VELOCITY DISTRIBUTION set up is continuously changed by fluid and interrupts between these districts, these perturbation process make fluid obtain preferably laterally mixing, the shell side spiral flow has strengthened the turbulivity of shell side greatly, even shell side is when to be high viscosity fluid or flow velocity low, also can obtain very high turbulivity, thereby strengthen the shell side heat transfer.
Claims (3)
1. a unsupported alternating curved tube dry type evaporator comprises refrigerant inlet, refrigerant exit, chilled water inlet, chilled water outlet, first end socket, second end socket, first tube sheet, second tube sheet, housing, dividing plate, heat exchanger tube and ties up steel band; Chilled water inlet, chilled water outlet are located at respectively on the housing, and the housing two ends are respectively first tube sheet and second tube sheet, and first tube sheet and second tube sheet are connected to form cavity with first end socket, second end socket respectively; Refrigerant inlet and refrigerant exit all are located on first end socket, separate by dividing plate; The heat exchanger tube two ends are fixed by first tube sheet and second tube sheet respectively; It is characterized in that: described heat exchanger tube is the alternating curved pipe, and the ratio of turning round journey and equivalent diameter of heat exchanger tube is 6～12; The minor axis of heat exchanger tube cross section is 0.5～0.7 with the ratio of major axis; The heat exchanger tube of alternating curved contacts arrangement successively, relies on each contact point self-supporting of alternating curved pipe to form tube bank.
2. unsupported alternating curved tube dry type evaporator according to claim 1 is characterized in that: described heat exchanger tube is arranged the tube bank that forms and is turned round journey every 5 and establish and tie up steel band, ties up tube bank.
3. unsupported alternating curved tube dry type evaporator according to claim 1 is characterized in that: described heat exchanger tube two ends are pipe, are used for fixing with first tube sheet and the welding of second tube sheet respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910214562A CN101762115A (en) | 2009-12-31 | 2009-12-31 | Unsupported alternating curved tube dry type evaporator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910214562A CN101762115A (en) | 2009-12-31 | 2009-12-31 | Unsupported alternating curved tube dry type evaporator |
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| CN101762115A true CN101762115A (en) | 2010-06-30 |
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| CN200910214562A Pending CN101762115A (en) | 2009-12-31 | 2009-12-31 | Unsupported alternating curved tube dry type evaporator |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095290A (en) * | 2011-03-11 | 2011-06-15 | 蒋剑荣 | Ice crystal evaporator and ice crystal water cooling device producing from same |
| CN102309868A (en) * | 2010-07-07 | 2012-01-11 | 杰智环境科技股份有限公司 | Organic solvent condensate recycling device |
| CN103335455A (en) * | 2013-05-16 | 2013-10-02 | 陈顺龙 | All-region heat-pump horizontal shell-and-tube heat exchanger |
| CN103411454A (en) * | 2013-08-29 | 2013-11-27 | 哈尔滨工业大学 | Tube type heat exchanger with outer-protruding-type corrugated tubes arranged in staggering mode |
| CN104949560A (en) * | 2014-08-27 | 2015-09-30 | 泰州市沪江特种设备有限公司 | Corrosion-resistant heat pump type horizontal sleeve heat exchanger |
| CN108443995A (en) * | 2018-01-29 | 2018-08-24 | 中国科学院广州能源研究所 | A kind of efficient heat-recycling fresh air regenerating device of three-dimensional structure changes |
| CN108954982A (en) * | 2018-08-15 | 2018-12-07 | 天津商业大学 | The dry evaporator of shwoot heat exchanger tube |
| CN109323277A (en) * | 2017-07-31 | 2019-02-12 | 上海明华电力技术工程有限公司 | Backheating type cooling system for fire grate |
| CN109442810A (en) * | 2018-11-28 | 2019-03-08 | 杨城林 | A kind of narrow passage modularization evaporator and its unit |
| CN110657691A (en) * | 2019-10-23 | 2020-01-07 | 华南理工大学 | Anti-freezing and anti-blocking LNG cold energy utilization enhanced heat transfer device |
| CN112105882A (en) * | 2018-04-19 | 2020-12-18 | 科氏传热有限合伙公司 | Heat exchanger apparatus and method of supporting a tube bundle in a heat exchanger |
-
2009
- 2009-12-31 CN CN200910214562A patent/CN101762115A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102309868A (en) * | 2010-07-07 | 2012-01-11 | 杰智环境科技股份有限公司 | Organic solvent condensate recycling device |
| CN102309868B (en) * | 2010-07-07 | 2015-02-11 | 杰智环境科技股份有限公司 | Organic solvent condensate recycling device |
| CN102095290A (en) * | 2011-03-11 | 2011-06-15 | 蒋剑荣 | Ice crystal evaporator and ice crystal water cooling device producing from same |
| CN102095290B (en) * | 2011-03-11 | 2012-12-26 | 蒋剑荣 | Ice crystal evaporator and ice crystal water cooling device producing from same |
| CN103335455A (en) * | 2013-05-16 | 2013-10-02 | 陈顺龙 | All-region heat-pump horizontal shell-and-tube heat exchanger |
| CN103411454A (en) * | 2013-08-29 | 2013-11-27 | 哈尔滨工业大学 | Tube type heat exchanger with outer-protruding-type corrugated tubes arranged in staggering mode |
| CN104949560A (en) * | 2014-08-27 | 2015-09-30 | 泰州市沪江特种设备有限公司 | Corrosion-resistant heat pump type horizontal sleeve heat exchanger |
| CN109323277A (en) * | 2017-07-31 | 2019-02-12 | 上海明华电力技术工程有限公司 | Backheating type cooling system for fire grate |
| CN108443995A (en) * | 2018-01-29 | 2018-08-24 | 中国科学院广州能源研究所 | A kind of efficient heat-recycling fresh air regenerating device of three-dimensional structure changes |
| CN112105882A (en) * | 2018-04-19 | 2020-12-18 | 科氏传热有限合伙公司 | Heat exchanger apparatus and method of supporting a tube bundle in a heat exchanger |
| CN108954982A (en) * | 2018-08-15 | 2018-12-07 | 天津商业大学 | The dry evaporator of shwoot heat exchanger tube |
| CN109442810A (en) * | 2018-11-28 | 2019-03-08 | 杨城林 | A kind of narrow passage modularization evaporator and its unit |
| CN109442810B (en) * | 2018-11-28 | 2024-04-12 | 杨城林 | Narrow-channel modularized evaporator and unit thereof |
| CN110657691A (en) * | 2019-10-23 | 2020-01-07 | 华南理工大学 | Anti-freezing and anti-blocking LNG cold energy utilization enhanced heat transfer device |
| CN110657691B (en) * | 2019-10-23 | 2024-04-12 | 华南理工大学 | Anti-freezing and anti-blocking LNG cold energy utilization enhanced heat transfer device |
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Open date: 20100630 |