CN101576360A - Low potential energy recovery high-efficiency combined heat exchange device based on heat pipe and finned pipe - Google Patents

Low potential energy recovery high-efficiency combined heat exchange device based on heat pipe and finned pipe Download PDF

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Publication number
CN101576360A
CN101576360A CNA2009100268141A CN200910026814A CN101576360A CN 101576360 A CN101576360 A CN 101576360A CN A2009100268141 A CNA2009100268141 A CN A2009100268141A CN 200910026814 A CN200910026814 A CN 200910026814A CN 101576360 A CN101576360 A CN 101576360A
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heat
pipe
finned
exchanger
heat pipe
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CNA2009100268141A
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黄和
莫立勤
索红波
胡燚
胡耀池
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Nanjing Tech University
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Nanjing Tech University
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Priority to CNA2009100268141A priority Critical patent/CN101576360A/en
Publication of CN101576360A publication Critical patent/CN101576360A/en
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Abstract

The invention discloses a low potential energy recovery high-efficiency combined heat exchange device based on a heat pipe and a finned pipe, which comprises a heat-pipe heat exchanger provided with the heat pipe and a finned heat exchanger provided with the finned pipe, and is characterized in that: the heat-pipe heat exchanger is divided into a heat pipe lower cavity and a heat pipe upper cavity through a clapboard; an evaporation section of the heat pipe is positioned in the heat pipe lower cavity; a condensation section of the heat pipe passes through the clapboard and then positioned in the heat pipe upper cavity; one end of the heat pipe lower cavity is provided with a heat carrier inlet, while the other end is communicated with one end of the finned heat exchanger; the other end of the finned heat exchanger is provided with a heat carrier outlet; an inlet end of the finned pipe extends out of the finned heat exchanger and is communicated with a cold carrier inlet, while the outlet end is communicated with the heat pipe upper cavity through a pipeline; and the heat pipe upper cavity is provided with a cold carrier outlet through which a cold carrier flowing into the pipeline flows out. The low potential energy recovery high-efficiency combined heat exchange device has the advantages of small volume and high heat exchange efficiency.

Description

Low potential energy recovery high-efficiency combined heat-exchanger rig based on heat pipe and finned tube
Technical field
The present invention relates to a kind of heat reclaim unit, especially a kind of high-efficiency heat exchanger that is widely used in exchange heat in various Waste Heat Recovery, the industrial production, specifically a kind of low potential energy recovery high-efficiency combined heat-exchanger rig based on heat pipe and finned tube.
Background technology
At present, the energy-saving and cost-reducing important developing goal of all trades and professions that become has become the emphasis of research by technical energy saving, also is effective means.Heat transmission equipment has purposes very widely in energy-conservation, become the break-through point of technical energy saving.
Heat exchanger is an imperative equipment in the industrial diabatic process, and almost all industrial circles all have application.Along with science and technology and industrial expansion, require heat transmission equipment compact more, light and handy, efficient and miniaturization.Traditional tubular heat exchanger and plate type heat exchanger single variety have been difficult to satisfy gas phase and liquid phase and the above-mentioned requirements of the operating mode of depositing.Therefore people are constantly seeking novel high-performance heat exchanger, heat pipe and finned heat exchanger be current as gas-liquid mutually and deposit heat exchange research often, efficient height, the new type heat exchanger that performance is good.
Heat pipe is a kind of enhanced heat transfer component efficiently.Its operation principle at first is to be proposed by American Gao Gele in nineteen forty-two, but does not attract much attention at that time.1964, because the needs of space technology, American's Ronald Grover was invented this novel heat transfer element.Since the seventies, heat pipe promptly turns to the practical stage from laboratory research, extensively is applied at present in the cooling of temperature control, electronic device of spacecraft and the various energy-recuperation system as main heat exchange element.Heat pipe still is the desirable components and parts of a kind of thermomotor heat transfer system simultaneously.
Finned tube is compared with light pipe, has bigger surface area consuming under the identical situation of metal material, belongs to augmentation of heat transfer for the first time from intuitively seeing, but the raising that has brought heat transfer coefficient when heat exchange area increases in fact, reaches the purpose of secondary augmentation of heat transfer.Its characteristics can effectively increase heat transfer area and enhancing heat transfer exactly, and than the stability that is easier to make and guarantee to operate.The range of application of finned tube is also very extensive, and except a large amount of uses such as refrigerator, air cooler, heat pipe equipment, also very general as the heat exchanger tube in the shell-and-tube heat exchanger, especially extensive in the petrochemical industry application prospect, result of use is more satisfactory.
The common problem that the heat exchanger existence of above-mentioned two kinds of heat pipes is installed is that volume is big, the heat waste height, if therefore existing two kinds of heat exchanger tubes are used in combination, not only can in petrochemical industry and various heat transfer retracting device, use, and has a compact conformation, floor space is little, under the suitable condition of heat output, only take up space is 1/2~1/3 of shell-and-tube heat exchanger, under identical heat transfer coefficient condition, drag losses can be controlled in 1/3 scope of shell-and-tube heat exchanger, simultaneously because compact conformation and volume are little, the external surface area of heat exchanger is very little, thereby heat loss is also little.Under the prerequisite of identical heat output, can make expenses such as equipment investment, capital expenditure, power consumption reduce greatly, particularly when needing to adopt expensive material, because efficient is high and fin sheet material is thin, equipment is more economical, in chemical field great purposes will be arranged.
According to the knowledge of the applicant, have not yet to see these two kinds of relevant reports that heat exchanger tube is used in combination.
Summary of the invention
The objective of the invention is to adopt heat pipe or finned tube separately mostly and exist volume big at present heat exchanger, the heat waste height, the problem that cost of investment is big designs and a kind ofly can give full play to the lower resistance of heat exchange characteristic separately, high efficiency novel gas-liquid mutually and the low potential energy recovery high-efficiency combined heat-exchanger rig of depositing based on heat pipe and finned tube.
Technical scheme of the present invention is:
A kind of low potential energy recovery high-efficiency combined heat-exchanger rig based on heat pipe and finned tube, comprise heat-pipe heat exchanger 13 that heat pipe 12 is installed and the finned heat exchanger 14 that finned tube 9 is installed, it is characterized in that described heat-pipe heat exchanger 13 is divided into heat pipe lower cavity 7 and heat pipe upper chamber 8 by dividing plate 15, the evaporator section of heat pipe 12 is arranged in described heat pipe lower cavity 7, and the condensation segment of heat pipe 12 is arranged in described heat pipe upper chamber 8 after passing described dividing plate 15; One end of heat pipe lower cavity 7 is provided with heat carrier import 1 other end and communicates with an end of finned heat exchanger 14, and the other end of finned heat exchanger 14 is provided with heating medium outlet 2; The entrance point of described finned tube 9 stretches out outside the finned heat exchanger 14 and communicates with cold carrier inlet 3, the port of export of finned tube 9 communicates with heat pipe upper chamber 8 by pipeline 10, and the top of heat-pipe heat exchanger 13 is provided with the cold carrier outlet 4 that makes the cold carrier outflow that flows into through pipeline 10.
The finned tube layer that the above undulate of one deck is arranged is installed in the described finned heat exchanger 14, connects into an integral body by connecting bend 15 between every layer of adjacent finned tube 9.
The bottom of described finned heat exchanger 14 is connected with gas-liquid separation pipeline 11.
In described heat pipe upper chamber 8, the top of heat pipe 12 is equipped with auxiliary thermal source 16.
Described auxiliary thermal source 16 is for being connected with the pipeline of hot water, steam or conduction oil, and the heat exchanging part of described pipeline is arranged in heat-pipe heat exchanger 13, and the additional medium import 5 and the additional media outlet 6 of pipeline all stretch out outside the heat-pipe heat exchanger 13.
Described auxiliary thermal source 16 is electric heating tube or electric heater.
Described heat pipe 12 vertical being installed in the heat-pipe heat exchanger triangular in shape.
Described heat pipe 12 is for having the heat pipe of fin.
Beneficial effect of the present invention:
1. for the recovery of low temperature heat energy, the present invention can play good effect, and efficient improves 30%~40%.And it is simple in structure, easy to make.As long as on the basis of existing heat pipe and finned tube, be connected, increase a cold fluid and get final product by the pipeline that finned tube enters the heat pipe upper cavity, do not need internal structure is changed.
2. the present invention can be used for gas-gas, the heat exchange between solution-air, and the influence of the heat carrier state of not catching a cold, adaptive faculty is strong.
3. the fin of the finned tube among the present invention can be made the Vertical Channel of upper and lower opening, helps improving fluid-flow rate.The raising of finned tube surfactant fluid flowing velocity will make the boundary layer attenuation; Under the same temperature difference, reducing of wake boundary layer thickness or turbulent boundary layer laminar sublayer thickness all will make boundary layer heat conduction strengthen.Simultaneously, fluid also can be owing to the raising of speed, and flow disturbance is strengthened, and convection transfer rate is improved.
4. the present invention combines heat pipe and finned tube, can bring into play the advantage of the two simultaneously.Heat exchange of heat pipe can make cold fluid and hot fluid separate fully by the median septum of heat exchanger, single heat pipe destroys because of reasons such as wearing and tearing, burn into overtemperatures in running, it also is single heat pipe failure, and the doping of cold fluid and hot fluid can not take place, the finned tube of back is not had any influence yet.So the heat exchange occasion of fluids such as that this heat exchanger is used for is easily right, explosive, corrosion has very high reliability.
5. the cold and hot fluid of heat exchanger of the present invention fully separately flows when the heat pipe heat exchanging part, can be relatively easy to realize the complete countercurrent flow of cold and hot fluid; Cold fluid and hot fluid all flows outside pipe simultaneously, because the outer coefficient of heat transfer that flows of pipe is far above the coefficient of heat transfer that flows in the pipe, and the both sides heating surface all adopts extended surface, and flow at the inside and outside of finned tube respectively at fin part cold fluid and hot fluid, can carry out the strong convection heat exchange again, the recovery that is used for the lower heat energy of grade is very economical.
6. for the higher fluid of dustiness, heat exchange of heat pipe can be by adjusting the heat pipe structure size, and the extended surface form is to solve the wearing and tearing of heat exchanger, stifled grey problem.
7. enlarging heat transfer area is a kind of effective way that increases heat dissipation capacity.By enlarging heat transfer area with augmentation of heat transfer, the present invention enlarges heat transfer area by increasing equipment volume simply, but the improvement by the heat-transfer area structure increases the heat transfer area in the unit volume, thereby makes heat exchanger efficient and compact.The present invention's opposite heat tube simultaneously also can carry out finization, makes up with finned tube exchanger again, has reduced heat exchanger volume when reaching the heat exchange effect.Both reduce the heat exchanger occupation space, also reduced cost of manufacture.
8. the present invention has taken all factors into consideration the various geometric parameters of heat exchanger when adopting extended surface to improve heat transfer area in the unit volume.Behind the extended surface, not only increase heat exchange area, increased the area that can carry out effective radiation heat transfer to external world simultaneously, can improve the heat loss through radiation amount, heat transfer coefficient can also be improved, the problems of bringing thus such as flow resistance increase will be eliminated when selecting suitable geometric parameter.Heat exchanger according to this parameter designing can reach best heat exchange effect like this.
9. studies show that of convection current of heat exchanging device and radiation, heat convection occupies more than 95% at low temperatures, and the ratio that radiation heat transfer occupies is less.Therefore strengthening the heat exchange of finned tube should mainly start with from strengthening heat convection.The situation of finned tube outside wall surface is to the heat convection in the flow process, and gas flow, and very big influence is all arranged.
10. this heat exchanger can adapt to the fluid of different in flow rate, and the heat transfer coefficient of finned tube exchanger may have certain reducing when flow velocity was slow, but the heat exchange effect of heat pipe section substantially can be not influenced.When flow velocity was big, two parts of heat exchanger had good heat exchange effect simultaneously.Can select according to action need like this.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the plan structure schematic diagram of Fig. 1.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, 2.
A kind of low potential energy recovery high-efficiency combined heat-exchanger rig based on heat pipe and finned tube, comprise heat-pipe heat exchanger 13 that heat pipe 12 is installed and the finned heat exchanger 14 that finned tube 9 is installed, the heat pipe of installing in the heat-pipe heat exchanger 13 12 can be general heat pipe, also can be the heat pipe that has fin, with further increase heat exchange effect, heat pipe 12 is vertical and is installed in the heat-pipe heat exchanger 13, and the arrangement mode of heat pipe 12 can adopt triangular arrangement; Finned tube 9 in the finned heat exchanger 14 is arranged by layer, the finned tube layer (among Fig. 1 being three layers) that one or more layers of undulate is arranged can be installed in the finned heat exchanger 14, connect into an integral body by connecting bend 15 between every layer of adjacent finned tube 9, as Fig. 2.Described heat-pipe heat exchanger 13 is divided into heat pipe lower cavity 7 and heat pipe upper chamber 8 by dividing plate 15, dividing plate 15 plays the fixedly effect of heat pipe 12 simultaneously, the evaporator section of heat pipe 12 is arranged in described heat pipe lower cavity 7, and the condensation segment of heat pipe 12 is arranged in described heat pipe upper chamber 8 after passing described dividing plate 15; One end of heat pipe lower cavity 7 is provided with heat carrier import 1 other end and communicates with an end of finned heat exchanger 14, and the other end of finned heat exchanger 14 is provided with heating medium outlet 2, also can connect gas-liquid separation pipeline 11 in its underpart in case of necessity; The entrance point of described finned tube 9 stretches out outside the finned heat exchanger 14 and communicates with cold carrier inlet 3, the port of export of finned tube 9 communicates with heat pipe upper chamber 8 by pipeline 10, and the top of heat-pipe heat exchanger 13 (being the top among Fig. 1) is provided with the cold carrier outlet 4 that makes the cold carrier outflow that flows into through pipeline 10.According to the requirement of subsequent technique and the calculating of heat exchange efficiency, if cold carrier does not reach predetermined technological temperature when flowing out from heat exchanger, also should be in heat pipe upper chamber 8, the top of heat pipe 12 installs auxiliary thermal source 16, described auxiliary thermal source 16 can be the pipeline that is connected with hot water, steam or conduction oil, the heat exchange main part of pipeline is arranged in heat-pipe heat exchanger 13, the additional medium import 5 and the additional media outlet 6 of pipeline all stretch out outside the heat-pipe heat exchanger 13, and auxiliary thermal source 16 also can be the electric heating tube or the electric heater of Controllable Temperature.
The present invention can fully reclaim the low temperature heat energy below 200 ℃ by utilizing heat pipe 12 and finned tube 9 characteristics separately.Heat pipe 12 and fin visitor's 9 connected mode be heat pipe preceding, promptly earlier the hot fluid of higher temperature is carried out heat exchange in heat pipe section, descend to some extent through heat pipe heat exchanging after heat fluid temperature (F.T.), enter finned tube again and carry out next step heat exchange.In heat-pipe heat exchanger, what upper cavity was walked is cold fluid, and what lower chamber was walked is hot fluid.Cold fluid and hot fluid is reverse flow in finned heat exchanger.
The heat exchange of heat pipe upper top is provided with the thermal source supplementary device, also can not have, and it is fixed to come according to specific requirement.Improve the scope of application of this device greatly and strengthened operating flexibility.
The heat pipe that working medium is housed also can carry out finization for the augmentation of heat transfer effect, and the wing ratio is generally 10~25.Heat-pipe heat exchanger is divided into two cavitys up and down by metal partion (metp), and what upper chamber was walked is cold fluid, and cavity airtight.Lower cavity is walked hot fluid, communicates with finned heat exchanger simultaneously, and hot fluid enters in the finned heat exchanger after with the working medium in the heat transferred heat pipe again heat is passed to cold fluid again like this.At this moment the upper chamber that cold fluid enters heat-pipe heat exchanger through pipeline is carried out heat exchange once more with the working medium that has absorbed heat.Through twice heat exchange, carried out the exchange of heat between cold fluid and hot fluid well.
When separating with metallic plate opposite heat tube formula heat exchanger, usefulness be the filled sealing means of screw thread.This mode good sealing effect can be used for the heat pipe that all there is fin at two ends.Consider that long-time running rear thread and nut can corrode " killing ", can on screw thread, be coated with thin lead powder, add after tightening and be coated with antirust paint.
When heat exchanger of the present invention is used to have the waste heat recovery of corrosive flue gas, can adjust the thermotube wall temperature, make heat pipe avoid maximum corrosion area as far as possible by the heat transfer area of adjusting heat exchange of heat pipe evaporator section, condensation segment.
The length of heat pipe can have multiple choices among the present invention, flow is hour optional long with 1-2m, and intermediate size can select for use 3-4m long, and larger capacity can be selected for use more than the 5m.
Heat pipe of the present invention can adopt the carbon steel pipe of φ 25mm, and working medium is water, also can adjust according to applicable cases.
What the tube bank of heat pipe of the present invention was adopted is equilateral triangle cross arrangement mode, its heat transfer intensity higher (than in-line arrangement high about 16%).
For finned heat exchanger, what cold fluid was walked is in the pipe, and what the gas phase hot fluid was walked is outside the pipe.Pipe is outer to carry out finization (being finned tube 9), no matter be gas-gas like this, or the solution-air heat exchange, all the bigger coefficient of heat transfer can be arranged.
Make the Vertical Channel of upper and lower opening among the present invention for the fin of finned heat exchanger, helped improving fluid-flow rate.The raising of finned tube superficial fluid velocity will make the boundary layer attenuation; Under the same temperature difference, reducing of wake boundary layer thickness or turbulent boundary layer laminar sublayer thickness all will make boundary layer heat conduction strengthen.
The variation of the height of the fin on the finned tube 9, spacing of fin, fin thickness all can exert an influence to heat dissipation capacity.The height of finned tube 9 of the present invention is 17.5mm (twining with 19mm band steel), and spacing of fin is 9~18mm, and fin thickness is more than the 1.0mm.
Along with the high increase of pipe, total heat dissipation capacity increases, but the unit mass heat dissipation capacity but reduces thereupon, and the present invention advises that the height of fin is 17.5mm, can make total heat dissipation capacity and unit mass heat dissipation capacity all bigger.
Fin height one is (17.5mm) regularly, pitch enlargement, and total heat dissipation capacity shows a rising trend, but the unit volume heat dissipation capacity is and reduces trend.The increase of spacing, the finned tube surface increases with the visibility of large space wall, and the heat loss through radiation amount increases, the passage that surrounds between adjacent fins becomes opening by sealing simultaneously, and thermal resistance is obviously diminished, and circulation obviously improves, the heat loss through convection amount also increases, and therefore total heat dissipation capacity all has tangible increase.But in order not cause heat exchanger volume not too large, spacing can change in 9~18mm scope.The fin angle of finned tube is the best with 60 degree because the fin angle be 60 o'clock be best for enhanced heat exchange, angle is that the passage that was produced in 60 o'clock neither can too narrowly cause mobile thermal chokes, also can similar large space and can't bring into play stack effect.
As seen from Figure 1, heat-exchanger rig of the present invention connects and composes the core of whole combined reactor by heat pipe and finned tube 9, and these two parts are the formants of heat exchange of conducting heat.It comprises heating medium inlet 1, heating medium outlet 2, cold carrier inlet 3, cold carrier outlet 4, heat-exchanger rig of the present invention in addition also comprises the thermal source supplementary device, pipeline 10, the pipeline 11 of bottom, described thermal source supplementary device comprise that thermal source replenishes import 5 and thermal source replenishes outlet 6.Heat pipe heat exchanging of the present invention partly is divided into upper chamber 7 and 8 two parts of lower cavity, wherein upper chamber is a condensation segment, lower cavity is a bringing-up section, epicoele is parallel with cavity of resorption but be not communicated with, the big I of upper chamber and lower cavity designs according to heat transferring medium, but lower cavity is greater than upper chamber.Finned tube 9 should adopt the finned tube parallel connection of same size to be welded to form, and the number of the finned tube that adopts can design according to concrete heat exchange requirement and thermal force, and the cold medium of finned tube can enter the heat pipe upper chamber by pipeline 10.The purpose of thermal source supplementary device setting mainly is not heat at also reach the cold medium that heat exchange requires by heat pipe and finned tube heat exchange again, thereby satisfies the subsequent technique requirement.The gas-liquid separation pipeline 11 of finned heat exchanger bottom mainly is to carry out gas-liquid separation at the heat carrier of lowering the temperature by heat exchange, wherein the liquid of condensation is partly got rid of by bottom gas-liquid separation pipeline 11 in the cooling, and the main purpose that gas-liquid separation pipeline 11 is set is to increase range of application of the present invention.The upper chamber that cold carrier at first enters heat exchange of heat pipe again during concrete work by the finned tube heat exchanging part.Reach subsequent technique after the cold carrier heat exchange of heat pipe heat exchanging upper chamber and require temperature if enter, then get rid of by the cold carrier outlet; Also do not satisfy the subsequent technique requirement if enter the cold carrier temperature of heat exchange of heat pipe upper chamber, then carry out the temperature adjustment heating by the thermal source supplementary device.The thermal source supplementary device can be hot water, steam source, the conduction oil supplementary device, it also can be electrical heating thermal source supplementary device, the elevated temperature heat carrier mainly enters by heating medium inlet 1, the elevated temperature heat carrier that enters by the heating medium inlet at first heats the heat pipe in the lower cavity, medium after the heating enters heat pipe condensation segment that is arranged in upper chamber and the cold carrier (partly being heated at finned heat exchanger) that enters upper chamber through pipeline 10 to carry out heat exchange and makes cold carrier be heated to cold carrier outlet 4 outflows of temperature (also should further heat by the auxiliary thermal source in case of necessity) back of setting from the heat-pipe heat exchanger top, the heat carrier that enters from heat carrier import 1 directly enters after the evaporator section to the heat pipe the lower cavity carries out heat exchange in the finned heat exchanger and externally carries out heat exchange with finned tube, discharges by heating medium outlet 2 at last and carries out in the follow-up operation.
Below be the actual effect of heat-exchanger rig test run of the present invention, superiority therefrom of the present invention as can be seen and outstanding effect.
Embodiment 1.
Utilize the present invention to reclaim the product ethene of ethanol dehydration and the waste heat of water, and heating reactant ethanol arrive to 150 ℃.
(1) the product ethene of ethanol dehydration and water are (370-400) ℃ by the temperature that reactor comes out, can reduce to 150 ℃ through its temperature after the step heat exchange, but be can this part low grade heat energy of more abundant recovery, can also reduce simultaneously the consumption of washings in the subsequent technique, use the heat-exchanger rig among the present invention here.
(2) heat exchange area of the heat pipe section of this device is 2.5m herein 2, the heat exchange area of finned tube part is 6.5m 2Mixture through ethene after the heat exchange and water can drop to 85 ℃ by original 150 ℃, and 25 ℃ ethanol raw material liquid can be heated to 85 ℃.
(3) enter the operating pressure of the mist of the ethene of heat-exchanger rig of the present invention and water and ethanol raw material all at (100-150) KPa.
What (4) the thermal source supplementary device at heat pipe heat exchanging part top also adopted is finned tube exchanger, and thermal source is used is water vapour under the 0.7MPa pressure.
(5) because the corrosivity of ethanol raw material heat exchanging device is less, and the very fast heat transfer coefficient of flow velocity is bigger, and what walk is in the pipe of finned tube exchanger, and what enter afterwards is the upper chamber of heat exchange of heat pipe.
(6) the mist flow velocity of ethene and water is less, and heat transfer coefficient is less, and what walk is outside the pipe of finned tube exchanger, is that the lower cavity by heat exchange of heat pipe enters before.
The ethanol water of (7) 25 ℃ of volume fractions 95% at first enters fin-tube heat exchanger by cold carrier import 3, through carrying out heat exchange with the about 100 ℃ ethene of being come in by heat-pipe heat exchanger lower cavity 7 and the mist of water vapour.Cold fluid can be heated to 70 ℃, and hot liquid is cooled to below 80 ℃.
(8) after the heat exchange of finned tube part is finished, the ethanol water of 70 ℃ of volume fractions 95% enters the upper chamber 8 of heat exchange of heat pipe via pipeline 10, through being heated to 85 ℃ with heat exchange, and in the lower cavity of heat-pipe heat exchanger, 150 ℃ the ethene and the mist of water vapour then are cooled to 100 ℃ after being entered by heat carrier import 1, enter fin-tube heat exchanger then.
(9) being heated to 85 ℃ ethanol water has become gas, then can be further further be heated to 150 ℃ through the steam-heated pipe line 5 (6) on heat exchange of heat pipe top.
(10) steam of such 150 ℃ second alcohol and water just can enter next process.
Embodiment 2.
Utilize the present invention to reclaim the product ethene of ethanol dehydration and the waste heat of water, and heating reactant ethanol arrive to 270 ℃.
(1) the product ethene of ethanol dehydration and water are (370-400) ℃ by the temperature that reactor comes out, directly enter this transmitting apparatus and carry out heat exchange, recovery waste heat, its temperature can be reduced to 80 ℃ after the heat exchange, ethanol raw material liquid can be heated to 270 ℃, can reduce thermal source like this and replenish.
(2) heat exchange area of the heat pipe section of this device is 4.5m herein 2, the heat exchange area of finned tube part is 10.5m 2Can ℃ drop to 85 ℃ by original (370-400) through the mixture of ethene after the heat exchange and water, and 25 ℃ ethanol raw material liquid can be heated to 270 ℃.
(3) enter the operating pressure of the mist of the ethene of heat-exchanger rig of the present invention and water and ethanol raw material all at (100-150) KPa.
(4) because the corrosivity of ethanol raw material heat exchanging device is less, and the very fast heat transfer coefficient of flow velocity is bigger, and what walk is in the pipe of finned tube exchanger, and what enter afterwards is the upper chamber of heat exchange of heat pipe.
(5) the mist flow velocity of ethene and water is less, and heat transfer coefficient is less, and what walk is outside the pipe of finned tube exchanger, is that the lower cavity by heat exchange of heat pipe enters before.
The ethanol water of (6) 25 ℃ of volume fractions 95% at first enters fin-tube heat exchanger by cold carrier import 3, through carrying out heat exchange with the about 250 ℃ ethene of being come in by heat-pipe heat exchanger lower cavity 7 and the mist of water vapour.Cold fluid can be heated to 170 ℃, and hot liquid is cooled to 85 ℃.
(8) after the heat exchange of finned tube part is finished, the ethanol water of 170 ℃ of volume fractions 95% enters the upper chamber 8 of heat exchange of heat pipe via pipeline 10, through being heated to 270 ℃ with heat exchange, and in the lower cavity of heat-pipe heat exchanger, (370-400) mist of ℃ ethene and water vapour then is cooled to 250 ℃ after being entered by heat carrier import 1, enters fin-tube heat exchanger then.
(9) steam of such 270 ℃ second alcohol and water just can directly enter reactor and participate in dehydration.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.

Claims (8)

1, a kind of low potential energy recovery high-efficiency combined heat-exchanger rig based on heat pipe and finned tube, comprise heat-pipe heat exchanger (13) that heat pipe (12) are installed and the finned heat exchanger (14) that finned tube (9) are installed, it is characterized in that described heat-pipe heat exchanger (13) is divided into heat pipe lower cavity (7) and heat pipe upper chamber (8) by dividing plate (15), the evaporator section of heat pipe (12) is arranged in described heat pipe lower cavity (7), and the condensation segment of heat pipe (12) is arranged in described heat pipe upper chamber (8) after passing described dividing plate (15); One end of heat pipe lower cavity (7) is provided with heat carrier import (1) other end and communicates with an end of finned heat exchanger (14), and the other end of finned heat exchanger (14) is provided with heating medium outlet (2); The entrance point of described finned tube (9) stretches out outside the finned heat exchanger (14) and communicates with cold carrier inlet (3), the port of export of finned tube (9) communicates with heat pipe upper chamber (8) by pipeline (10), and the top of heat-pipe heat exchanger (13) is provided with the cold carrier outlet (4) that makes the cold carrier outflow that flows into through pipeline (10).
2, heat-exchanger rig according to claim 1, it is characterized in that the finned tube layer that the above undulate of one deck is arranged is installed in the described finned heat exchanger (14), connect into an integral body by connecting bend (15) between every layer of adjacent finned tube (9).
3, heat-exchanger rig according to claim 1 is characterized in that the bottom of described finned heat exchanger (14) is connected with gas-liquid separation pipeline (11).
4, heat-exchanger rig according to claim 1 is characterized in that in described heat pipe upper chamber (8), the top of heat pipe (12) is equipped with auxiliary thermal source (16).
5, heat-exchanger rig according to claim 4, it is characterized in that described auxiliary thermal source (16) is for being connected with the pipeline of hot water, steam or conduction oil, the heat exchanging part of described pipeline is arranged in heat-pipe heat exchanger (13), and the additional medium import (5) and the additional media outlet (6) of pipeline all stretch out outside the heat-pipe heat exchanger (13).
6, heat-exchanger rig according to claim 4 is characterized in that described auxiliary thermal source (16) is electric heating tube or electric heater.
7, heat-exchanger rig according to claim 1 is characterized in that described heat pipe (12) vertical being installed in the heat-pipe heat exchanger triangular in shape.
8,, it is characterized in that described heat pipe (12) is for having the heat pipe of fin according to claim 1 or 7 described heat-exchanger rigs.
CNA2009100268141A 2009-06-01 2009-06-01 Low potential energy recovery high-efficiency combined heat exchange device based on heat pipe and finned pipe Pending CN101576360A (en)

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CN103217044A (en) * 2012-01-20 2013-07-24 千德销售管理股份公司 Heat exchanger element and method for the production
CN103376012A (en) * 2012-04-20 2013-10-30 财团法人工业技术研究院 Heat exchange apparatus
WO2019223037A1 (en) * 2018-05-22 2019-11-28 袁昭 Split-type condenser for recovering high temperature total heat
CN111533766A (en) * 2020-03-25 2020-08-14 中棉小康生物科技有限公司 Ethephon rearrangement process
CN113446885A (en) * 2020-07-23 2021-09-28 中北大学 Internal circulation communication control heat pipe system
CN113465178A (en) * 2020-07-23 2021-10-01 中北大学 Communication waste heat utilization heat pipe system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103217044A (en) * 2012-01-20 2013-07-24 千德销售管理股份公司 Heat exchanger element and method for the production
CN103217044B (en) * 2012-01-20 2016-12-21 西风有限公司 Heat exchanger element and production method thereof
CN103376012A (en) * 2012-04-20 2013-10-30 财团法人工业技术研究院 Heat exchange apparatus
CN103376012B (en) * 2012-04-20 2015-04-08 财团法人工业技术研究院 Heat exchange apparatus
WO2019223037A1 (en) * 2018-05-22 2019-11-28 袁昭 Split-type condenser for recovering high temperature total heat
CN111533766A (en) * 2020-03-25 2020-08-14 中棉小康生物科技有限公司 Ethephon rearrangement process
CN113446885A (en) * 2020-07-23 2021-09-28 中北大学 Internal circulation communication control heat pipe system
CN113465178A (en) * 2020-07-23 2021-10-01 中北大学 Communication waste heat utilization heat pipe system
CN113465178B (en) * 2020-07-23 2022-04-15 中北大学 Communication waste heat utilization heat pipe system
CN113446885B (en) * 2020-07-23 2022-06-07 中北大学 Internal circulation communication control heat pipe system
CN114593522A (en) * 2020-07-23 2022-06-07 中北大学 Smoke temperature measurement cooperative control heat pipe system

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