WO2010068157A1 - Distributeurs d'écoulement situés dans un échangeur de chaleur tubulaire - Google Patents

Distributeurs d'écoulement situés dans un échangeur de chaleur tubulaire Download PDF

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Publication number
WO2010068157A1
WO2010068157A1 PCT/SE2009/000495 SE2009000495W WO2010068157A1 WO 2010068157 A1 WO2010068157 A1 WO 2010068157A1 SE 2009000495 W SE2009000495 W SE 2009000495W WO 2010068157 A1 WO2010068157 A1 WO 2010068157A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat transfer
transfer tubes
heat exchanger
flow distributors
product
Prior art date
Application number
PCT/SE2009/000495
Other languages
English (en)
Inventor
Lars Josefsson
Original Assignee
Tetra Laval Holdings & Finance S.A.
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 Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Publication of WO2010068157A1 publication Critical patent/WO2010068157A1/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
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/002—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using inserts or attachments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/028—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by using inserts for modifying the pattern of flow inside the header box, e.g. by using flow restrictors or permeable bodies or blocks with channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0042—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for foodstuffs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/02—Streamline-shaped elements

Definitions

  • the present invention relates to a device in a tubular heat exchanger, comprising a product flow insert consisting of a number of heat transfer tubes, with a tube plate disposed in each end of the heat transfer tubes, where at least that one of the tube plates which constitutes the inlet to the heat transfer tubes is designed with flow distributors which surround the ends of the heat transfer tubes, and the flow distributors being so designed that the surface of the flow distributors facing the flow direction is convex.
  • Heat exchangers of which there are numerous types, are employed when the intention is to heat or cool a liquid product. With the aid of, e.g., steam or water at different temperatures, it is possible to heat or cool a preferably liquid product to the desired degree. Heat exchangers are put to use in different processing industries and are also a common occurrence in food plants, such as dairies and juice factories.
  • tubular heat exchanger which consists of one or more heat exchanger elements which are interconnected to form a flow system.
  • the heat exchanger elements comprise one or more heat transfer tubes surrounded by an outer shell or jacket tube.
  • the heat transfer tubes are interconnected to form product flow inserts which in their turn are interconnected by means of product pipe bends in order to circulate the product which is to be heated or cooled, depending upon the process for which the heat exchanger is used.
  • the heat exchanger tubes are enclosed in shell or jacket tubes which also enclose the heat transfer medium which may consist of water at different temperatures, steam or other types of liquids or gases.
  • One type of tubular heat exchanger is described in Swedish Patent Specification SE 501 908.
  • a tubular heat exchanger in accordance with the above description may be employed for treating liquids containing large particles or fibres, such as for example orange juice with relatively long fibres.
  • Uncut orange fibres may be up to 20 mm in length.
  • the fibrous liquid is caused to pass through the product flow inserts, the liquid from the product pipe bends must be distributed via a tube plate into the individual heat transfer tubes. In such instance, it is a common occurrence that the fibres "hang up" on the edge on entry into the heat exchange tubes and accumulate here.
  • Trials have demonstrated that when the pressure thereby increases, an entire accumulation of fibres is flushed along, whereafter the accumulation restarts and, as a result, an uneven distribution of the fibres in the liquid will be the result. Severe accumulation of fibres may also give rise to production disruptions and cleaning problems. Large particles may also contribute to the formation of plugs or clogging in the inlets to the individual heat transfer tubes.
  • One object of the present invention is to design the tube plates so that a greater number of heat transfer tubes may be connected to the tube plate while maintaining the same diameter of the tube plate.
  • a further object of the present invention is, with an increased number of heat transfer tubes per product insert, that there will be obtained a more efficient heat exchanger, also for products containing long fibres.
  • Fig. 1 shows the principle of a tubular heat exchanger
  • Fig. 2 shows, partly in section, a tube plate with the possible number of heat transfer tubes according to the prior art
  • Fig. 3 shows the principle of flow distributors according to the prior art
  • Fig. 4 shows, partly in section, a tube plate with the possible number of heat transfer tubes according to the present invention.
  • Fig. 5 shows the principle of flow distributors according to the present invention.
  • Fig. 1 shows the principle of a tubular heat exchanger 1, where one, or most generally several heat exchanger elements 2, are interconnected to form a flow unit.
  • Each heat exchanger element 2 consists of a number of heat transfer tubes 3 surrounded by an outer shell or jacket tube 4.
  • the heat transfer tubes 3 in each shell or jacket tube 4 are combined to form a product insert 5 in that a tube plate 6 is disposed in each end 10 of the heat transfer tubes 3.
  • the product inserts 5 with their heat transfer tubes 3 are intended to circulate that product which is to be treated in the heat exchanger 1.
  • the different product inserts 5 are interconnected to one another by means of product pipe bends 7 and the outer product inserts 5 are connected to inlet and outlet conduits, respectively, for the product.
  • the intention is to have as large a number of heat transfer tubes 3 as is possible to enclose in the shell or jacket tube 4 taking into account the product which is to be circulated.
  • a product containing particles or fibres requires a tube diameter of the heat transfer tubes which is between 2 and 2.5 times the particle size in the product. The greater the number and the smaller the size of the heat transfer tubes 3 which will be housed in the shell or jacket tube 4, the more efficient will be the heat transfer which is obtained.
  • the heat transfer medium which is used, i.e.
  • the shell or jacket tubes 4 are in their turn interconnected with communicating right-angled tube sections 8, or alternatively with inlet or outlet connections for the heat transfer medium.
  • the product inserts 5 are fitted in the shell or jacket tube 4 with seals 9 so that product and heat transfer medium are kept separate.
  • the product When the product reaches a product insert 5, either via a product pipe bend 7 or an inlet conduit, the product is to be distributed at the tube plate 6 into the different heat transfer tubes 3.
  • the ends 10 of the heat transfer tubes 3 are secured in the tube plate 6.
  • flow distributors 11 are required in order that the fibres of the product do not "hang up" between the ends 10 of the heat transfer tubes 3. As a result of the flow distributors 11, the fibres can orient themselves and become distributed before accompanying the product into the heat transfer tubes 3.
  • Fig. 2 shows a tube plate 6 according to the prior art.
  • the flow distributors 11 are not included in the Drawing, which shows only that number of heat transfer tubes 3 which it is possible to connect to a tube plate 6 of a given diameter.
  • Fig. 3, which is a partial magnification of Fig. 2 shows the flow distributors 11 which take up a certain surface space on the tube plate 6 and thereby restrict the number of heat transfer tubes 3 which it is possible to connect. As shown in Fig. 2, only three heat transfer tubes 3 will have room along the diameter of a given tube plate 6.
  • Fig. 4 shows a tube plate 6 according to the present invention.
  • the flow distributors 11 are not shown on the Drawing, which merely shows that number of heat transfer tubes 3 which it is possible to connect to a tube plate 6 of one and the same diameter as the tube plate in Fig. 2.
  • Fig. 5, which a partial magnification of Fig. 4, shows that the flow distributors 12 do not take up as much surface area and thereby do not restrict the number of heat transfer tubes to the same extent.
  • Fig. 4 shows five heat transfer tubes 3 along the diameter of the tube plate 6.
  • the present invention may also be employed for tube plates 6 with up to seven heat transfer tubes 3 along the diameter. This a major advantage, since the greater the number and the smaller the size of heat transfer tubes 3 which may be accommodated in the shell or jacket tube 4, the greater will be the heat transfer surface which is obtained and thereby a more efficient heat exchanger 1.
  • the flow distributors 11 have been designed so that a portion 12 of them partly covers the inlet to the heat transfer tubes 3.
  • the flow distributors 11 have convex surfaces facing the flow direction.
  • the portions 12 of the flow distributors 11 which surround the ends 10 of the heat transfer tubes 3 are gently rounded so that no "sharp" or abrupt edges are to be found where the product flows past, hi side elevation, the flow distributors 11 have a "mushroom-shaped" appearance.
  • the flow distributors 11 according to the present invention make it possible to process a product containing long fibres, without the need to regularly discontinue production and reverse the flow direction through the tubular heat exchanger 1 in order by such means to rinse off fibres which have "hung up".
  • the device according to the present invention affords a possibility of using a tubular heat exchanger with more heat transfer tubes per tube plate for products which contain particles and long fibres.
  • the present invention permits that the fibres are guided gently and efficiently into the heat transfer tubes, without the fibres running the risk of accumulating on the tube plate.
  • the present invention also permits the tubular heat exchanger to be run regeneratively for products containing long fibres.

Landscapes

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

Abstract

L'invention concerne un dispositif situé dans un échangeur de chaleur tubulaire (1), destiné en particulier à des produits contenant des fibres ou des particules. Le dispositif comprend un insert d'écoulement de produit (5) constitué d'un certain nombre de tubes de transfert de chaleur (3) et d'une plaque tubulaire (6) solidement fixée à chaque extrémité (10) des tubes de transfert de chaleur (3). Afin que les fibres et les particules traversent les plaques tubulaires sans s'accumuler de façon indésirable, au moins une des plaques tubulaires (6) qui constituent l'orifice d'entrée menant aux tubes de transfert de chaleur (3) présente des distributeurs d'écoulement (11) dont la surface convexe fait face à la direction de l'écoulement et dont une partie (12) recouvre partiellement les orifices d'entrée menant aux tubes de transfert de chaleur (3).
PCT/SE2009/000495 2008-12-09 2009-11-19 Distributeurs d'écoulement situés dans un échangeur de chaleur tubulaire WO2010068157A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0802541A SE0802541A1 (sv) 2008-12-09 2008-12-09 Anordning vid en tubvärmeväxlare
SE0802541-3 2008-12-09

Publications (1)

Publication Number Publication Date
WO2010068157A1 true WO2010068157A1 (fr) 2010-06-17

Family

ID=42242946

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2009/000495 WO2010068157A1 (fr) 2008-12-09 2009-11-19 Distributeurs d'écoulement situés dans un échangeur de chaleur tubulaire

Country Status (2)

Country Link
SE (1) SE0802541A1 (fr)
WO (1) WO2010068157A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3524918A1 (fr) * 2013-04-11 2019-08-14 SPX Flow Technology Danmark A/S Échangeur de chaleur hygiénique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0586747A1 (fr) * 1992-09-10 1994-03-16 The Procter & Gamble Company Système d'échangeur de chaleur avec turbulateur pour dispersions particules/liquide
WO1997021970A1 (fr) * 1995-12-14 1997-06-19 Tetra Laval Holdings & Finance S.A. Ameliorations concernant les echangeurs de chaleur tubulaires
JPH10160388A (ja) * 1996-11-26 1998-06-19 Hitachi Ltd 熱交換器
JP2005291624A (ja) * 2004-03-31 2005-10-20 Iwai Kikai Kogyo Co Ltd 多管式熱交換器
EP1604162B1 (fr) * 2003-03-17 2006-08-02 Tuchenhagen Dairy Systems GmbH Echangeur thermique a faisceau tubulaire
WO2007068343A1 (fr) * 2005-12-13 2007-06-21 Tuchenhagen Dairy Systems Gmbh Dispositif d'action sur l'ecoulement dans la zone d'une plaque porte-tubes d'un echangeur de chaleur a faisceau de tubes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0586747A1 (fr) * 1992-09-10 1994-03-16 The Procter & Gamble Company Système d'échangeur de chaleur avec turbulateur pour dispersions particules/liquide
WO1997021970A1 (fr) * 1995-12-14 1997-06-19 Tetra Laval Holdings & Finance S.A. Ameliorations concernant les echangeurs de chaleur tubulaires
JPH10160388A (ja) * 1996-11-26 1998-06-19 Hitachi Ltd 熱交換器
EP1604162B1 (fr) * 2003-03-17 2006-08-02 Tuchenhagen Dairy Systems GmbH Echangeur thermique a faisceau tubulaire
JP2005291624A (ja) * 2004-03-31 2005-10-20 Iwai Kikai Kogyo Co Ltd 多管式熱交換器
WO2007068343A1 (fr) * 2005-12-13 2007-06-21 Tuchenhagen Dairy Systems Gmbh Dispositif d'action sur l'ecoulement dans la zone d'une plaque porte-tubes d'un echangeur de chaleur a faisceau de tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3524918A1 (fr) * 2013-04-11 2019-08-14 SPX Flow Technology Danmark A/S Échangeur de chaleur hygiénique
US10627169B2 (en) 2013-04-11 2020-04-21 Spx Flow Technology Danmark A/S Hygienic heat exchanger
US11885574B2 (en) 2013-04-11 2024-01-30 Spx Flow Technology Danmark A/S Hygienic heat exchanger

Also Published As

Publication number Publication date
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