WO1995030866A1 - Echangeur de chaleur - Google Patents

Echangeur de chaleur Download PDF

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Publication number
WO1995030866A1
WO1995030866A1 PCT/FI1995/000160 FI9500160W WO9530866A1 WO 1995030866 A1 WO1995030866 A1 WO 1995030866A1 FI 9500160 W FI9500160 W FI 9500160W WO 9530866 A1 WO9530866 A1 WO 9530866A1
Authority
WO
WIPO (PCT)
Prior art keywords
hoses
heat exchanger
liquid
mounting plate
feed tank
Prior art date
Application number
PCT/FI1995/000160
Other languages
English (en)
Inventor
Tapio Kordelin
Original Assignee
Oy Shippax Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oy Shippax Ltd. filed Critical Oy Shippax Ltd.
Priority to AU20746/95A priority Critical patent/AU2074695A/en
Publication of WO1995030866A1 publication Critical patent/WO1995030866A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/062—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing tubular conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/06—Evaporators with vertical tubes
    • B01D1/065—Evaporators with vertical tubes by film evaporating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D3/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits
    • F28D3/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits with tubular conduits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination

Definitions

  • the invention relates to a hose heat exchanger wherein the hoses are made of thin flexible material like plastic sheet.
  • Conventional tubular heat exchangers comprise a package of tubes fitted inside a closed pressure vessel wherein one substance, normally the liquid to be heated, runs in the tubes, and another substance, normally the condensing vapour, flows between the tubes and condenses when it meets the tube surface.
  • one substance normally the liquid to be heated
  • another substance normally the condensing vapour
  • the prior art tube heat exchangers are made of steel or some other metal. Manufacturing costs are high and, owing to its structure, servicing of the apparatus like cleaning of the heat surfaces is time consuming. Therefore, these heat exchangers are not suitable for use in situations wherein the heat surfaces easily get dirty like e.g. in the production of fresh water from sea water. Neither are they suitable for treating such solutions in which the problem is strong corrosion of metallic surfaces.
  • the heat exchanger of this invention is suitable for use particularly in such situations which involve heavy fouling of the heat surfaces or corrosive liquids.
  • This kind of heat exchanging situations are normally such that the condensing of the vapour phase into liquid takes place on the first side of the heat exchanging surface and the evaporation of the liquid phase into vapour takes place on the second side of the heat exchanging surface.
  • This kind of heat exchangers can be used e.g. in thermo- compressor evaporators and in conventional evaporator plants in which live steam is used as the source of energy. Their purpose of use may be to obtain a distillation product of desired quality like production of fresh water from sea water or purification of industrial process water before leading back to the process or to drain. Another purpose may be evaporation of excess solvent from various dilute solutions or suspensions to obtain a desired concentrate.
  • Such film heat exchangers are previously known which are suitable for use in a film evaporator or distillation apparatus operating in the thermo-compressor principle.
  • the heat exchanger unit is formed of flat bag-like elements of thin sheet material like plastic sheet placed against each other. Heat transfer takes place from the vapour condensing inside the elements through the sheet to the evaporating liquid falling on the outer surfaces of the elements. The vapour, which is introduced into the elements and which releases heat upon condensing, is generated outside the elements and its pressure and temperature has been raised by a compressor before it is introduced into the elements.
  • FI 79948 and FI 86961 is described a heat exchanger suitable for a film distillation apparatus wherein the heat surfaces are thin plastic sheet.
  • the plastic sheets are formed into vertical bag structures arranged adjacently.
  • the liquid to be evaporated is led to fall from the top downwards along the outer surfaces of the bags whereupon part of it is evaporated.
  • the pressure of the evaporated vapour and accordingly the condensation temperature is raised by a compressor after which it is introduced into the bag structures. Condensing of the vapour takes place there and the distillate or condensate obtained is discharged from the bottom of the bag.
  • Inside the bag structure there are gorges obtained by welding the sheets together by point welds or by welding the sheets together by broken zigzag seams.
  • At the top of the bag structure there is an end lath with a honeycomb structure from which the liquid to be evaporated is introduced onto the outer surface of the bag structure.
  • the end lath also comprises channels through which the vapour going into the bag structure is introduced.
  • the objective of this invention is to remove the above problems and obtain an improved heat exchanger which has a structure of a hose heat exchanger.
  • Tube exchangers which would suit to the evaporators described above and which, consequently, would have the tubes made of plastic or the like material are not previously known.
  • the invention relates to a heat exchanger comprising a bundle of hoses to be positioned vertically. At their upper ends, the hoses are mounted to a transverse perforated upper mounting plate and, at their lower ends, the hoses are mounted to a transverse perforated lower mounting plate.
  • the heat exchanger also comprises means for introducing vapour into the hoses and distributing the liquid to be evaporated onto the outer surface of the hoses.
  • the hoses are made of thin flexible material like plastic sheet.
  • the upper mounting plate forms a cover of the feed tank of the liquid to be evaporated. The bottom of the feed tank is provided with lead-through holes for the hoses .
  • the diameter of the lead-through holes is larger than the outer diameter of the hoses so as to allow liquid to flow down through the gap formed between the outer surface of the hose and the plate.
  • one or more redistributing tanks provided with a perforated bottom plate are fitted between the feed tank of the liquid to be evaporated and the condensate receiver.
  • the heat exchanger of the invention has a much better heat transfer efficiency than the conventional solutions. Owing to the structure a large heat surface is obtained with respect to the volume of the apparatus . Said heat surface is always fully utilized because the hoses cannot stick together during operation.
  • the heat exchanger is quite beneficial in terms of manufacturing, service, storage, and transportation costs. It is particularly suitable for use in such plants which nowadays employ heat exchangers comprising of bag-like plastic sheet elements.
  • Fig. 1 shows the structure of a heat exchanger as a partly cross-sectional perspective view
  • Fig. 2 shows the leading-through of the heat exchanger hoses at the bottom of the feed and redistribution tank
  • Fig. 3 shows the attachment of the heat exchanger hoses of Fig. 1 to the mounting plate
  • Fig. 4 shows the perforation of the plates.
  • Fig. 1 shows one embodiment of the heat exchanger 10.
  • the apparatus has a bundle of vertically positioned hoses 11. At their upper ends, the hoses are attached to a transverse perforated upper mounting plate 21 and, at their lower ends, they are attached to a transverse perforated lower mounting plate 31.
  • the figure shows only a few hoses but in practice there are as many as the area of the plates 21 and 31 accommodates.
  • the vapour is introduced into the hoses from above with means which are not shown in the figure except the sleeves 12.
  • the hoses 11 are made of thin and flexible plastic sheet.
  • a feed tank 20 In order to spread the liquid to be evaporated onto the outer surface of the hoses there is formed a feed tank 20 in which said upper mounting plate 21 forms the cover.
  • the bottom 22 of the feed tank is provided with lead-through holes 24 for the hoses 11. It is seen in Fig. 2 that the diameter of the lead-through holes 24 is larger than the outer diameter of the hoses 11.
  • the liquid collected in the feed tank 20 can flow down through the gap 25 formed between the outer surface of the hose and the plate as indicated by the arrow.
  • the gap 25 must be dimensioned so that the liquid in question flows down at a suitable velocity.
  • the feed tank 20 presented in Fig. 1 has a shape of a prism. It is closed at two of its opposite sides 28, 29 and open at two of its opposite sides 26, 27 communicating with the distribution tank 40 of the liquid to be evaporated into which the liquid to be evaporated is pumped. Liquid flows from the distribution tank 40 into the feed tank 20 through its open sides 26, 27.
  • the bottom 41 of the distribution tank 40 is suitably located at a lower level than the bottom 22 of the feed tank.
  • the reference number 42 is a seal in the joint between the tank 40 and the tank 20.
  • the lower mounting plate 31 forms the cover of the receiver
  • the condensate is removed from the receiver though a hose 32.
  • one or more redistribution tanks 50, 50' provided with a perforated bottom plate 51, 51' may be fitted between the feed tank 20 of the liquid to be evaporated and the condensate receiver 30 as shown in Fig. 1. If the length of the hoses is 1200 mm, it is presumably the most suitable way to employ 1-2 redistribution tanks.
  • the holes in the bottom of the redistribution tank are larger than the external diameter of the hoses so that the liquid can flow through the gaps thus formed at a suitable velocity along the external surface of the hoses until evaporation has taken place.
  • the condensate receiver 30 and both redistribution tanks 50, 50' are suspended by chains 60 from the bottom of the redistribution tank or the liquid feed tank 20, respectively, next above.
  • a heat exchanger is obtained which is collapsible and takes very little space during storage and transportation.
  • Fig. 3 shows the attachment of the hose 11 to the upper mounting plate 21.
  • the hose is tightened fast to the hole by means of a sleeve 12 fitting into the hose, the sleeve being pressed down until a sufficient tightness is obtained.
  • the sleeve 12 which is preferably made of plastic, may be slightly conical as shown in the figure. This kind of attachment is rapid and easy needing no adhesive, filling compound or any other adhesive compound of non-foodstuffs quality which would restrict the use of the heat exchanger.
  • the hoses are attached to the lower mounting plate in the corresponding way.
  • the perforation of all plates is such that the holes are placed at intervals as shown in Fig. 4 to make the available plate area accommodate a maximum number-of hoses. This solution accomplishes a very large heat surface per unit volume of the heat exchanger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention se rapporte à un échangeur de chaleur (10) comprenant des tubes (11) devant être positionnés verticalement. Les tubes (11) sont fixés, par leurs extrémités supérieures, à une plaque de fixation supérieure perforée (21) et, par leurs extrémités inférieures, à une plaque de fixation inférieure perforée transversale (31). Les tubes sont réalisés en un matériau souple tel qu'une feuille en plastique. La plaque de fixation supérieure (21) forme un couvercle de la cuve d'alimentation (20) contenant le fluide devant être évaporé. Le fond (22) de la cuve d'alimentation est pourvu de trous (24) à travers lesquels passent les tubes, le diamètre des trous (24) étant plus grand que le diamètre interne des tubes (11) pour permettre l'écoulement du fluide à travers l'intervalle formé entre la surface externe du tube et la plaque. Selon l'invention, une ou plusieurs cuves de redistribution (30) pourvues d'une plaque inférieure perforée (51) sont insérées entre la cuve d'alimentation (20) du fluide devant être évaporé et le récepteur de condensat (30).
PCT/FI1995/000160 1994-05-05 1995-03-27 Echangeur de chaleur WO1995030866A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20746/95A AU2074695A (en) 1994-05-05 1995-03-27 Heat exchanger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI942068 1994-05-05
FI942068A FI942068A (fi) 1994-05-05 1994-05-05 Lämmönvaihdin

Publications (1)

Publication Number Publication Date
WO1995030866A1 true WO1995030866A1 (fr) 1995-11-16

Family

ID=8540643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1995/000160 WO1995030866A1 (fr) 1994-05-05 1995-03-27 Echangeur de chaleur

Country Status (3)

Country Link
AU (1) AU2074695A (fr)
FI (1) FI942068A (fr)
WO (1) WO1995030866A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000044467A1 (fr) * 1999-01-28 2000-08-03 Atlantis Water Systems (Australia) Ltd Evaporateur a plaques a plusieurs elements et plateaux conçus pour ces elements
CN100412468C (zh) * 2006-05-12 2008-08-20 衣家文 利用水源热泵换热的方法及设备
NL2006986C2 (nl) * 2011-06-22 2013-01-02 Marinus Willem Glind Ventilatiesysteem voor een gebouw.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR551410A (fr) * 1921-04-15 1923-04-05 Air Liquide Procédé et dispositifs pour refroidir un gaz
GB1139810A (en) * 1965-05-25 1969-01-15 Courtaulds Ltd Vapour-compression distillation
GB2120770A (en) * 1982-05-26 1983-12-07 Hitachi Ltd Falling film evaporation type heat exchanger
FR2621112A1 (fr) * 1987-09-29 1989-03-31 Commissariat Energie Atomique Dispositif de repartition d'un liquide s'ecoulant autour d'un tube vertical, notamment pour un echangeur de chaleur
DE4135816C2 (de) * 1990-10-30 1994-08-25 Magdy El Allawy Mohamed Dünnschichtwärmetauscher

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR551410A (fr) * 1921-04-15 1923-04-05 Air Liquide Procédé et dispositifs pour refroidir un gaz
GB1139810A (en) * 1965-05-25 1969-01-15 Courtaulds Ltd Vapour-compression distillation
GB2120770A (en) * 1982-05-26 1983-12-07 Hitachi Ltd Falling film evaporation type heat exchanger
FR2621112A1 (fr) * 1987-09-29 1989-03-31 Commissariat Energie Atomique Dispositif de repartition d'un liquide s'ecoulant autour d'un tube vertical, notamment pour un echangeur de chaleur
DE4135816C2 (de) * 1990-10-30 1994-08-25 Magdy El Allawy Mohamed Dünnschichtwärmetauscher

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 10, No. 253, M-512; & JP,A,61 079 985 (TOSHIBA CORP), 23 April 1986. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000044467A1 (fr) * 1999-01-28 2000-08-03 Atlantis Water Systems (Australia) Ltd Evaporateur a plaques a plusieurs elements et plateaux conçus pour ces elements
CN100412468C (zh) * 2006-05-12 2008-08-20 衣家文 利用水源热泵换热的方法及设备
NL2006986C2 (nl) * 2011-06-22 2013-01-02 Marinus Willem Glind Ventilatiesysteem voor een gebouw.

Also Published As

Publication number Publication date
AU2074695A (en) 1995-11-29
FI942068A0 (fi) 1994-05-05
FI942068A (fi) 1995-11-06

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