CN102000438A - Horizontal elliptical tube falling film evaporator/condenser - Google Patents
Horizontal elliptical tube falling film evaporator/condenser Download PDFInfo
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- CN102000438A CN102000438A CN 201010522059 CN201010522059A CN102000438A CN 102000438 A CN102000438 A CN 102000438A CN 201010522059 CN201010522059 CN 201010522059 CN 201010522059 A CN201010522059 A CN 201010522059A CN 102000438 A CN102000438 A CN 102000438A
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- tube
- horizontal
- condenser
- evaporator
- falling film
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- 239000011552 falling film Substances 0.000 title claims abstract description 37
- 238000001704 evaporation Methods 0.000 claims abstract description 55
- 230000000694 effects Effects 0.000 claims abstract description 21
- 230000008020 evaporation Effects 0.000 claims description 51
- 239000007921 spray Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 abstract description 35
- 239000010408 film Substances 0.000 abstract description 18
- 238000009833 condensation Methods 0.000 abstract description 16
- 230000005494 condensation Effects 0.000 abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 1
- 239000013535 sea water Substances 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 4
- 210000001520 comb Anatomy 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a horizontal elliptical tube falling film evaporator/condenser, which belongs to the technical field of heat-exchange equipment. The horizontal elliptical tube falling film evaporator/condenser comprises an evaporator/condenser shell, a sprinkling device, a horizontal elliptical tube bundle, a gas inlet tube box, an outlet tube box or a gas inlet tube box of a next effect evaporator/condenser. The horizontal elliptical tube falling film evaporator/condenser is characterized in that: a horizontal falling film evaporating/condensing heat-exchange tube bundle adopts an elliptical cross-section tube, the long axis of the elliptical tube is positioned in a vertical direction, and the minor axis of the elliptical tube is positioned in the horizontal direction. The horizontal elliptical tube falling film evaporator/condenser has the effects and advantages of overcoming the defects that the effective heat transfer area is reduced because condensation water occupies a large part of the cross section of the heat exchange tube in the middle and back parts of the conventional horizontal round tube, and the heat exchange coefficients are reduced because a liquid film is thick outside the tube, improving the heat exchange coefficients of internal and external parts of the tube, and reducing the material consumption of a heat-transfer tube.
Description
Technical field
The invention belongs to the heat transmission equipment technical field.Relate to a kind of falling film evaporation/condenser, particularly a kind of horizontal ellipse pipe falling film evaporation/condenser that is used for the desalting seawater through multi-effect evaporation system.
Background technology
At present, the heat-transfer area of existing in the world horizontal pipe falling film evaporation/condenser is made of the horizontal pipe tube bank usually, adopts vapor condensation process in the falling film evaporation of horizontal tube outside liquid, the pipe, its structural representation such as Fig. 1 (A) and Fig. 1 (B).
The evaporation process of many large-scale plants as large-scale sea water desalinating unit, adopts the multiple-effect evaporation form, comprises a plurality of evaporator in the system, forms multi-effect evaporation system, the vaporising device unit that it is core that " effect " here is meant with an evaporator.The evaporation equipment unit mainly adopts the high horizontal pipe falling film evaporation/condenser of heat transfer efficiency, evaporator with sea water desalinating unit is an example, the operation principle of each horizontal pipe falling film evaporation/condenser of multi-effect evaporation system is the same: reach or imitate the charging of evaporator near the seawater of evaporimeter internal pressure saturation temperature as each, the charging seawater by seawater spraying device b be sprayed onto horizontal pipe tube bank c above, seawater forms the horizontal tube surface under the gravity effect in the tube bank outside the circumferential falling liquid film in edge flows.If the charging seawater is in supercooled state, several combs are heated to saturation temperature in the evaporimeter to the falling liquid film seawater on the upper strata, enter evaporation stage then; Under the heat effect of the seawater of saturation state steam in pipe, surface evaporation takes place and generates steam, i.e. indirect steam in part.Indirect steam between tube bank or both sides flow to the tail end of this evaporator along the heat exchanger tube parallel direction, this outlet bobbin carriage e of imitating evaporator is imitated the admission bobbin carriage of evaporator simultaneously as next, the indirect steam of evaporation of seawater generation will begin the heat transfer process of next effect as next heating steam of imitating evaporator like this.Emit latent heat during the outer seawater of heating steam heating tube in pipe and be condensed into water, last indirect steam of imitating i.e. n effect evaporator generation will be condensed into water in condenser.The heat that adds of horizontal tube is produced by the condensation heat of managing interior steam in the evaporator, first heating steam of imitating evaporator comes from external heat source, steam comes from the indirect steam of an effect evaporator in all the other each effect pipes, and the condensation product of indirect steam is exactly the fresh water that is generated by seawater.Heat transfer process is finished in evaporator housing a.
For horizontal pipe falling film evaporation/condenser, heating steam enters in the pipe with higher flow velocity in evaporator admission bobbin carriage d, and steam heat release in flowing is condensed into water gradually.Under the little temperature difference, the tube wall in the shared zone of condensation water, pipe pipe bottom conducts heat extremely faint; And heat transfer outside a tube tube bank bottom liquid film thickens also and can have a negative impact to heat transfer.If can reduce the heat exchanger tube surface area that condensation water occupies in the pipe, reduce the thickness of liquid film of tube outer surface, will help improving the heat transfer coefficient of horizontal tube falling film evaporation/condenser, reduce heat transfer area, reduce heat transfer tubing consumption.
Summary of the invention
The invention provides a kind of horizontal ellipse pipe falling film evaporation/condenser, solve existing horizontal pipe bottom condensation water and occupied the problem that the pipe surface area reduces heat transfer coefficient greatly, reduced the heat exchanger tube surface area that condensation water occupies in the horizontal tube, improve the heat transfer coefficient of horizontal pipe falling film evaporation/condenser, reduced heat transfer tubing consumption.
Technical scheme of the present invention is:
A kind of horizontal ellipse pipe falling film evaporation/condenser, its structural representation such as Fig. 2 (A), Fig. 2 (B) and Fig. 2 (C), wherein Fig. 2 (C) is the partial enlarged drawing of Fig. 2 (B).This horizontal ellipse pipe falling film evaporation/condenser comprises the air inlet bobbin carriage 5 of evaporator housing 1, spray equipment 2, horizontal ellipse pipe tube bank 3, air inlet bobbin carriage 4, outlet bobbin carriage or next effect evaporator.It is characterized in that: the heat-transfer pipe that adopts the elliptic cross-section of horizontal positioned, the major axis of oval cross section is positioned at vertical direction, minor axis is positioned at horizontal direction, in the horizontal tube falling film evaporation diabatic process, the upper face of the hydraulic shock elliptical tube that drip by upper strata pipe has the curvature bigger than the pipe of equal sectional area owing to the oval cross section pipe, subsequently so fluid flows downward at faster speed, make the liquid film attenuate of elliptical tube outer surface, improved the evaporation heat transfer coefficient of outer surface.For in the pipe, when the liquid measure of condensing is identical, when the sectional area of condensation water is identical in the pipe in other words, in the vertical oval cross section horizontal tube of major axis, the contact area of liquid film and tube wall reduces, and pipe internal upper part coagulating liq because of with the outer identical reason of pipe, the speed that flows down also than in the pipe greatly, help conducting heat, therefore mean heat transfer coefficient improves in the pipe.The acting in conjunction that horizontal tube is inside and outside will make the oval cross section pipe have than the better falling film evaporation of circular tube/condensation heat transfer effect.
Heating steam is entered by air inlet bobbin carriage 4 that heating tube sprays liquid outward in the elliptical tube, emits latent heat in the heating process and is condensed into liquid.Feed liquid by liquid spraying device 2 be sprayed onto horizontal ellipse pipe tube bank 3 above, liquid flows at the tube bank outside forms the horizontal tube surface under the gravity effect falling liquid film, if feed liquid is in supercooled state, several combs are heated to the saturation temperature in the evaporimeter on the upper strata, enter evaporation stage then.Under the heat effect of steam, the evaporation of part falling-film liquid generates steam, i.e. secondary steam in pipe.Secondary steam between tube bank or both sides flow to the tail end of this evaporator along the heat exchanger tube parallel direction, this outlet bobbin carriage 5 of imitating evaporator is imitated the air inlet bobbin carriage of evaporator simultaneously as next, the secondary steam of liquid evaporation generation will be imitated the heating steam of evaporator as next like this, unevaporated liquid is collected and is imitated to next by spray outside the ellipse tube bank of evaporator in evaporator housing 1 bottom, begins the heat transfer process of next effect.In the horizontal pipe falling film evaporation diabatic process, manage the upper face of the hydraulic shock elliptical tube that drips by the upper strata, because the oval cross section pipe has the curvature bigger than the pipe of equal sectional area, so fluid flows downward at faster speed, make the liquid film attenuate of elliptical tube outer surface, improved the evaporation heat transfer coefficient of outer surface.In addition, for the condensation water of same amount in the pipe, compare with the circular cross-section horizontal tube, in the vertical oval cross section horizontal tube of major axis, the contact area of liquid film and tube wall reduces, and has increased effective heat transfer area, therefore mean heat transfer coefficient raising in the pipe.Like this, under the inside and outside acting in conjunction of pipe, make the Heat Transfer in Evaporating Falling Film coefficient of horizontal ellipse pipe be higher than the Heat Transfer in Evaporating Falling Film coefficient of horizontal pipe.The heat that adds of horizontal tube is produced by the condensation heat of managing inner vapor in the evaporator, first heating steam of imitating evaporator comes from external heat source, all the other each effects are managed the secondary steam that inner vapors come from an effect evaporator, and last secondary steam of imitating i.e. n effect evaporator generation will condense in condenser.
Effect of the present invention is that the horizontal pipe of traditional evaporator is alternative with the vertical horizontal ellipse pipe of major axis with benefit, overcome traditional horizontal pipe and taken effective heat transfer area because pipe inner bottom part condensation water gathers large tracts of land, and effective heat transfer area is reduced, manage the shortcoming of the thicker reduction heat transfer coefficient of outer liquid film, the horizontal ellipse pipe that major axis is vertical can make the liquid film attenuate of elliptical tube outer surface than deep camber, improved the evaporation heat transfer coefficient of outer surface, the ratio that while liquid film and tube wall contact area account for whole heat exchanger tube sectional area reduces to have guaranteed effective heat transfer area.Compare with traditional horizontal pipe, improved the condensation heat transfer coefficient in horizontal pipe falling film evaporation/condenser rear portion pipe, under identical evaporation capacity condition, will significantly reduce the heat-transfer pipe material consumption.
Description of drawings
Fig. 1 (A) is that traditional horizontal pipe falling film evaporation/condenser is faced structural representation.
Among the figure: a evaporator housing; The b spray equipment; The tube bank of c horizontal pipe; D admission bobbin carriage; E outlet bobbin carriage or next are imitated the admission bobbin carriage of evaporator.
Fig. 1 (B) is traditional horizontal pipe falling film evaporation/condenser side TV structure schematic diagram.
Among the figure: a evaporator housing; The b spray equipment; The tube bank of c horizontal pipe.
Fig. 2 (A) is that horizontal ellipse pipe falling film evaporation/condenser of the present invention is faced structural representation.
Among the figure: 1 evaporator housing; 2 spray equipments; The tube bank of 3 horizontal ellipse pipes; 4 air inlet bobbin carriages; 5 outlet bobbin carriages or next are imitated the air inlet bobbin carriage of evaporator.
Fig. 2 (B) is horizontal ellipse pipe falling film evaporation of the present invention/condenser side TV structure schematic diagram.
Among the figure: 1 evaporator housing; 2 spray equipments; The tube bank of 3 horizontal ellipse pipes.
Fig. 2 (C) is the partial enlarged drawing of Fig. 2 (B).
The specific embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
Referring to Fig. 2 (A), Fig. 2 (B) and Fig. 2 (C), " the horizontal ellipse pipe falling film evaporation/condenser " that reaches of the present invention is meant the horizontal heat exchange tube Shu Caiyong elliptical tube tube bank 3 of evaporator, and the major axis of elliptical tube is positioned at vertical direction, and minor axis is positioned at horizontal direction.
In Fig. 2 (A), Fig. 2 (B) and Fig. 2 (C), evaporator adopts the heat-transfer pipe of the elliptic cross-section of horizontal positioned, the major axis of elliptical tube is positioned at vertical direction, minor axis is positioned at horizontal direction, pipe is treated as a stranger evaporating liquid and is formed liquid film down by spray equipment 2 sprays, thereby by the heating of the heat steam in elliptical tube evaporation.In the horizontal tube falling film evaporation diabatic process, because the oval cross section pipe has the curvature bigger than the pipe of equal sectional area, so fluid is flowed to the heat exchanger tube bottom by heat exchanger tube top at faster speed, make the liquid film of the elliptical tube outer surface liquid film outer thin, improved the evaporation heat transfer coefficient of outer surface than pipe.For in the pipe, when the liquid measure of condensing is identical, compare with circular tube, in the vertical oval cross section horizontal tube of major axis, the contact area of liquid film and tube wall reduces, and helps conducting heat therefore mean heat transfer coefficient raising in the pipe.The acting in conjunction that horizontal tube is inside and outside will make the oval cross section pipe have than the better falling film evaporation of circular tube/condensation heat transfer effect.The pipe inner vapor becomes liquid because of the heating condensation, and in the multi-effect evaporation system, all condensed fluids are imitated the evaporator discharger by last.The steam of managing outer heated liquid evaporation generation flow in the outlet bobbin carriage 5 of evaporator after demister elimination small amount of drop along interbank gap, promptly enter back one and imitate the air inlet bobbin carriage of evaporator, as next thermal source of imitating evaporator, begin the evaporative condenser heat transfer process of next effect.The outer unevaporated liquid of pipe flows to the equipment bottom, drains into next by U type drainpipe and imitates the evaporator shell-side.
The present invention has overcome in original multiple-effect horizontal pipe falling film evaporation sea water desalting plant, owing to accounting for the excessive effective heat exchange area that causes of pipe cross section ratio, the condensate liquid that accumulates in the heat exchange pipe pipe reduces, manages unfavorable factors such as the blocked up reduction heat transfer coefficient of outer liquid film, improved the condensation heat transfer coefficient in horizontal pipe falling film evaporation/condenser rear portion pipe, under identical evaporation capacity condition, to reduce the heat-transfer pipe material consumption, be a kind of evaporation, coagulation devices efficiently, can be used in the multiple-effect evaporation heat-exchange system of various industrial circles.
Claims (2)
1. horizontal ellipse pipe falling film evaporation/condenser, comprise the air inlet bobbin carriage (5) of evaporator housing (1), spray equipment (2), the tube bank of horizontal ellipse pipe (3), air inlet bobbin carriage (4), outlet bobbin carriage or next effect evaporator, it is characterized in that: the horizontal heat exchange tube Shu Caiyong oval cross section tube bank (3) of evaporator.
2. a kind of horizontal ellipse pipe falling film evaporation/condenser according to claim 1, it is characterized in that: the major axis of horizontal ellipse pipe is positioned at vertical direction, and minor axis is positioned at horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010522059 CN102000438A (en) | 2010-10-19 | 2010-10-19 | Horizontal elliptical tube falling film evaporator/condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010522059 CN102000438A (en) | 2010-10-19 | 2010-10-19 | Horizontal elliptical tube falling film evaporator/condenser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102000438A true CN102000438A (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010522059 Pending CN102000438A (en) | 2010-10-19 | 2010-10-19 | Horizontal elliptical tube falling film evaporator/condenser |
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| CN (1) | CN102000438A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454056A (en) * | 2014-10-22 | 2015-03-25 | 烟台荏原空调设备有限公司 | Dual-working-medium cycle power generation system |
| CN106823423A (en) * | 2017-01-20 | 2017-06-13 | 东华大学 | Semiellipse pipe falling film evaporator |
| CN108671570A (en) * | 2018-05-08 | 2018-10-19 | 大连理工大学 | A kind of inclined ellipse pipe falling film evaporator |
| CN110327644A (en) * | 2019-07-22 | 2019-10-15 | 大连理工大学 | A kind of energy-saving horizontal pipe falling-film evaporating condenser |
-
2010
- 2010-10-19 CN CN 201010522059 patent/CN102000438A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 《工程热物理学报》 20081031 蒋翔等 蒸发式冷凝器管外流体流动与传热传质强化 1698-1702 1-2 第29卷, 第10期 2 * |
| 《石油化工设备》 20070731 张景卫等 蒸发式冷凝器管束中强制对流空气CFD 模拟 1-5 1-2 第36卷, 第4期 2 * |
| 《郑州工业大学学报》 19971231 吴金星等 板壳式降膜蒸发器结构及性能研究 7-12 1-2 第18卷, 第4期 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454056A (en) * | 2014-10-22 | 2015-03-25 | 烟台荏原空调设备有限公司 | Dual-working-medium cycle power generation system |
| CN106823423A (en) * | 2017-01-20 | 2017-06-13 | 东华大学 | Semiellipse pipe falling film evaporator |
| CN108671570A (en) * | 2018-05-08 | 2018-10-19 | 大连理工大学 | A kind of inclined ellipse pipe falling film evaporator |
| CN110327644A (en) * | 2019-07-22 | 2019-10-15 | 大连理工大学 | A kind of energy-saving horizontal pipe falling-film evaporating condenser |
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Application publication date: 20110406 |