US20150159964A1 - Tubular heat exchanger - Google Patents

Tubular heat exchanger Download PDF

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Publication number
US20150159964A1
US20150159964A1 US14/412,637 US201314412637A US2015159964A1 US 20150159964 A1 US20150159964 A1 US 20150159964A1 US 201314412637 A US201314412637 A US 201314412637A US 2015159964 A1 US2015159964 A1 US 2015159964A1
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US
United States
Prior art keywords
tube
corrugation
heat exchanger
product
pitch
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US14/412,637
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English (en)
Inventor
Michael Olsson
Fredrik Carlsson
Matthias Widén
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
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 and Finance SA filed Critical Tetra Laval Holdings and Finance SA
Assigned to TETRA LAVAL HOLDINGS & FINANCE S.A. reassignment TETRA LAVAL HOLDINGS & FINANCE S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OLSSON, MICHAEL, CARLSSON, FREDRIK, WIDÉN, Matthias
Publication of US20150159964A1 publication Critical patent/US20150159964A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1607—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with particular pattern of flow of the heat exchange media, e.g. change of flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/105—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being corrugated elements extending around the tubular elements
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A23C3/033—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A23C3/033—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus
    • A23C3/037—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus in direct contact with the heating medium, e.g. steam
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/16—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials
    • A23L3/18—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus
    • A23L3/22—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus with transport through tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/08—Tubular elements crimped or corrugated in longitudinal section
    • 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
    • F28F2210/00—Heat exchange conduits
    • F28F2210/06—Heat exchange conduits having walls comprising obliquely extending corrugations, e.g. in the form of threads

Definitions

  • the present invention relates to a multitube tubular heat exchanger and a method for changing the temperature of a liquid product flowing through such heat exchanger. More particularly, the present invention relates to an inner tube of such multitube tubular heat exchanger.
  • Heat exchangers are well known for heating a flow of liquid product being transported through the heat exchanger.
  • heat exchangers are widely used within liquid food processing, i.e. dairies, wherein heat treatment of the liquid food product is crucial for providing pasteurisation and/or sterilization of the product.
  • the main principle of heat exchangers in general is to transfer heat to the product, whereby the size and configuration of the heat exchanger depends on various parameters such as flow rate, physical properties of the liquid, desired pressure drop, temperature range etc.
  • Typical examples of heat exchangers utilized in food processing systems include plate heat exchangers, tubular heat exchangers, and scraped-surface heat exchangers.
  • heat exchanger type is normally dependent on the type of liquid product to be heated.
  • Plate heat exchangers are normally chosen for liquid products having a very low viscosity, whereby scraped-surface heat exchangers are used for high viscous liquids including large-sized particles.
  • Tubular heat exchangers have been found to be suitable for medium viscous liquids including small-sized particles such as fibres etc.
  • tubular heat exchangers One particular type of tubular heat exchangers is the multitube tubular heat exchanger in which the liquid product is transported through a group of parallel inner tubes, while the heat transfer media flows between the inner tubes thus surrounding the inner tubes.
  • the inner tubes should provide turbulence of the liquid product flow. Further, it would be advantageous if the inner tubes also contribute to turbulence of the heat transfer media on the outside. However, the corrugations of the inner tubes should at the same time prevent particles of the liquid product, or heat transfer media if the heat exchanger is used in a regenerative mode, from being trapped. Finally, the inner tubes should also be configured for facilitating and improving cleaning of the heat exchanger.
  • the present invention preferably seeks to mitigate, alleviate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and solves at least the above mentioned problems by providing a system according to the appended claims.
  • An idea of the present invention is to provide helical corrugations on the inner tubes.
  • a further idea is to increase the width of the helical corrugation pattern, such that the width-pitch ratio is increased.
  • a tube for a heat exchanger said tube being provided with a helical corrugation, wherein the helical corrugation has pitch and a width, and the width being at least 20% of the pitch.
  • the width may be 30 to 80% of the pitch. Even more specifically, the width may be 30 to 70% of the pitch.
  • the outer diameter of the tube may be between 1 and 4 cm. More specifically, the outer diameter may be between 1 and 2 cm.
  • the pitch of the corrugation may be in the interval of 1 to 4 cm. More specifically, the pitch of the corrugation may be in the interval of 2 to 3 cm.
  • the depth of the corrugation may be in the interval of 0.5 to 2 mm.
  • the corrugation is symmetrical from a side view or longitudinal cross-sectional view of the tube.
  • the corrugation is asymmetrical from a side view or longitudinal cross-sectional view of the tube.
  • a tube set comprising a number of tubes according to the first aspect.
  • the tube set may be comprised in an outer tube.
  • the number of tubes may be between 1 and 40.
  • a heat exchanger for heat treating liquid food products comprising a tube set according to the second aspect.
  • a first tube set may be connected to a second tube set by a connection tube, such that the first tube set is arranged in parallel with the second tube set.
  • a processing system for reducing a number of microorganisms in a product comprising a product inlet and a product outlet, and a heat exchanger according to the third aspect, arranged downstream the inlet and upstream the outlet.
  • the processing system may be regenerative such that outcoming product acts as heating medium for incoming product.
  • the product may be milk.
  • FIG. 1 is a process scheme of a dairy system including a multitube tubular heat exchanger according to an embodiment
  • FIG. 2 is a process scheme of a dairy system including a multitube tubular heat exchanger according to an embodiment
  • FIG. 3 is an isometric view of a multitube tubular heat exchanger according to an embodiment
  • FIG. 4 is an isometric view of a part of the multitube tubular heat exchanger shown in FIG. 3 ;
  • FIG. 5 is a side view of an embodiment of an inner tube of the multitube heat exchanger.
  • FIG. 6 a is a side view of a further embodiment of an inner tube
  • FIG. 6 b is an enlarged side view of a portion of the inner tube shown in FIG. 6 a.
  • the shown dairy system 10 is configured to perform various treatments of milk for providing long-life milk by means of ultra high temperature exposure.
  • the dairy system 10 includes a product inlet 12 and a product outlet 14 arranged downstream of the product inlet 12 .
  • the dairy system 10 also comprises a number of equipment arranged between the inlet 12 and the outlet 14 through which the milk is flowing.
  • the milk, entering the dairy system 10 at the inlet 12 is fed to a balance tank 16 from which it flows to a first preheater 20 by means of a feed pump 18 .
  • the preheater 20 is a multitube tubular heat exchanger configured to increase the temperature of the milk from approximately 4° C. up to approximately 80° C.
  • the milk is thereafter fed to a steam injection head 22 which serves to rapidly increase the temperature of the milk to 140-150° C. After keeping the elevated temperature for some time the milk is quickly cooled down when entering vacuum vessel 24 .
  • the milk thereafter passes a centrifugal pump 26 and an aseptic homogenizer 38 before it enters a cooler 30 in the form of a multitube tubular heat exchanger 30 in which the temperature of the milk is lowered to approximately 25° C.
  • the outlet 14 is capable of diverting the milk to either a storage tank, indicated by the letter “A”, or a liquid product filling machine, indicated by the letter “B”.
  • the multitube tubular heat exchanger such as heat exchangers 20 , 30 is denoted by the reference numeral 100 .
  • the tubular heat exchanger 100 may also be used for cooling down a product by using e.g. cold water instead of hot water as thermal transfer medium, such as the case for with the multitube tubular heat exchanger 30 of FIG. 1 .
  • the tubular heat exchanger may be used as a so-called regenerative system, i.e. that the product itself is used as a thermal transfer medium.
  • a regenerative system may be used in a dairy where incoming milk is heated up at the same time as outgoing milk is cooled down.
  • An advantage of a regenerative system is that the energy consumption of the equipment may be significantly decreased.
  • a regenerative system 10 ′ according to one embodiment is disclosed in FIG. 2 , said regenerative system 10 ′ comprising the equipment disclosed in FIG. 1 together with the heat exchanger 100 in regenerative form.
  • FIG. 3 illustrates one example of the multitube tubular heat exchanger 100 , more particularly a Tetra SpirafloTM, suitable for heat treating milk, juice, nectar and other liquid food.
  • a food product, or any other product to be processed flows in tubes bundled together in tube sets.
  • the tubes are surrounded by a thermal transfer medium, such as hot water, heating up the product. It is common practice to connect the tube sets to each other by using connection tubes, such that long tubes are formed while keeping the tubular heat exchanger 100 compact.
  • a first tube set 102 in this particular example comprising seven inner tubes 200 bundled together, are positioned within an outer tubular tube 103 .
  • the first tube set 102 may be connected to a second tube set 104 , also comprising seven inner tubes bundled together, by a connection tube 106 .
  • the connection tube 106 may be released, thereby making it possible to look inside the inner tubes 200 .
  • the tube sets 102 , 104 may be pulled out from the housing holding the tube sets 102 , 104 .
  • Different number of tubes may be comprised in the tube sets 102 , 104 , such as between 1 and 40, such as 7 to 16, depending e.g. on the capacity of the heat exchanger.
  • the size of the outer tube 103 is adapted in accordance with the number of tubes in the tube sets 102 , 104 .
  • FIG. 5 a side view of an inner tube 200 is shown.
  • the inner tube 200 is preferably arranged adjacent to further inner tubes 200 of the same construction for forming a tube set 102 .
  • the inner tube 200 has an outer diameter D 1 .
  • the inner tube 200 is provided with a helical corrugation.
  • the helical corrugation has an angle ⁇ in relation to a transversal plane of the inner tube 200 .
  • the helical corrugation has a width W 1 .
  • the helical corrugation is separated by a separation distance S 1 , as a result of the width W 1 and the angle ⁇ .
  • the separation distance S 1 is equal to the pitch P 1 of the corrugation minus the width W 1 of the corrugation, from a side view or longitudinal cross-sectional view, of the inner tube 200 .
  • the corrugation has a depth H 1 , which is the distance from the periphery of diameter D 1 to the bottom of the corrugation from a side view or longitudinal cross-sectional view, of the inner tube 200 .
  • the corrugation is symmetrical, which means that the deepest part of the corrugation is positioned centrally of the borders of the corrugation, from said perspective.
  • the corrugation is asymmetrical, which means that the deepest part of the corrugation is positioned closer to one border of the corrugation than the other, from a side view or longitudinal cross-sectional view, of the inner tube 200 .
  • the width W 2 may then be divided into two subwidths W 21 , W 22 , defining the distance from the deepest part of the corrugation to the two borders, respectively, of the corrugation, from a side view or longitudinal cross-sectional view, of the inner tube 200 .
  • the helical corrugation is separated by a separation distance S 2 , as a result of the width W 2 and the angle ⁇ .
  • the separation distance S 2 is equal to the pitch P 2 of the corrugation minus the width W 2 of the corrugation, from a side view or longitudinal cross-sectional view, of the inner tube 200 .
  • the corrugation has a depth H 2 , which is the distance from the periphery of diameter D 1 to the bottom of the corrugation from a side view or longitudinal cross-sectional view, of the inner tube 200 .
  • this depth H 2 is located closer to one border of the corrugation than the other.
  • the outer diameter D 1 of the inner tube 200 is preferably between 1 and 4 cm, such as 1 to 3 cm, and preferably between 1 and 2 cm to obtain a good heat exchange for the products in question, to facilitate the arrangement of tube sets in a housing for heat-exchanging the food product in an effective way with a low pressure drop.
  • the pitch P 1 , P 2 of the corrugation is preferably selected to be in the interval of 1 to 4 cm, such as between 2 and 3 cm, to in the same way obtain good heat-exchanging with low pressure drop and high heat transfer coefficient.
  • the depth is preferably selected to be in the interval of 0.5 to 2 mm.
  • the width W 1 , W 2 should be at least 20%, such as at least 30 to 80%, such as 30 to 70% of the pitch P 1 , P 2 .
  • the width W 1 , W 2 is at least 20% of the pitch P 1 , P 2 it is has been surprisingly found that the pressure drop along the inner tube may be decreased by as much as 30% in comparison with pipes bearing a corrugation having a width of less than 20% of the pitch thereof.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US14/412,637 2012-05-07 2013-07-04 Tubular heat exchanger Abandoned US20150159964A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1250779-4 2012-07-05
SE1250779 2012-07-05
PCT/EP2013/064179 WO2014006151A1 (fr) 2012-07-05 2013-07-04 Echangeur de chaleur tubulaire amélioré

Publications (1)

Publication Number Publication Date
US20150159964A1 true US20150159964A1 (en) 2015-06-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
US14/412,637 Abandoned US20150159964A1 (en) 2012-05-07 2013-07-04 Tubular heat exchanger

Country Status (4)

Country Link
US (1) US20150159964A1 (fr)
EP (1) EP2877799A1 (fr)
CN (1) CN104428620A (fr)
WO (1) WO2014006151A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3663693B1 (fr) * 2018-12-07 2023-08-30 Tetra Laval Holdings & Finance S.A. Évaporateur à couches minces pour produits laitiers
EP4015958A1 (fr) * 2020-12-17 2022-06-22 Tetra Laval Holdings & Finance S.A. Tuyau de transfert de chaleur ondulé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6164370A (en) * 1993-07-16 2000-12-26 Olin Corporation Enhanced heat exchange tube
EP1742006A1 (fr) * 2005-07-02 2007-01-10 Tuchenhagen Dairy Systems GmbH Procédé et dispositif de guidage du fluide dans les conduits d'un échangeur de chaleur à tubes pour le traitement térmique des suspensions
US20080310995A1 (en) * 2003-12-12 2008-12-18 Charm Stanley E Method, Device and System for Thermal Processing

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US3088494A (en) * 1959-12-28 1963-05-07 Babcock & Wilcox Co Ribbed vapor generating tubes
US3826304A (en) * 1967-10-11 1974-07-30 Universal Oil Prod Co Advantageous configuration of tubing for internal boiling
GB1250870A (fr) * 1969-10-08 1971-10-20
AU7757581A (en) 1980-11-19 1982-05-27 United Energy Technologies Inc. Enhanced surface tubing
JPS60181590A (ja) * 1984-02-27 1985-09-17 Hideyuki Ogasawara 熱交換管
US5709029A (en) * 1992-09-22 1998-01-20 Energy Saving Concepts Limited Manufacture of helically corrugated conduit
SE501908C2 (sv) * 1993-10-21 1995-06-19 Tetra Laval Holdings & Finance Värmeväxlare med sammankopplade moduler
SE9804037L (sv) * 1998-11-25 2000-05-26 Tetra Laval Holdings & Finance Värmeväxlare
JP2001289583A (ja) * 2000-04-10 2001-10-19 Usui Internatl Ind Co Ltd Ｅｇｒガス冷却装置
CN201133781Y (zh) * 2007-09-30 2008-10-15 苏州方圆换热器有限公司 换热器用螺旋波纹换热管
JP2009180453A (ja) * 2008-01-31 2009-08-13 Hitachi Cable Ltd レベルワウンドコイル、及びコルゲート伝熱管の製造方法
DE102008036125A1 (de) 2008-08-01 2010-02-04 Krones Ag Röhrenwärmeüberträger und Verfahren zur Wärmeübertragung zwischen wenigstens zwei Lebensmittelströmen
KR101620106B1 (ko) * 2010-01-15 2016-05-13 엘지전자 주식회사 이중 열교환기

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6164370A (en) * 1993-07-16 2000-12-26 Olin Corporation Enhanced heat exchange tube
US20080310995A1 (en) * 2003-12-12 2008-12-18 Charm Stanley E Method, Device and System for Thermal Processing
EP1742006A1 (fr) * 2005-07-02 2007-01-10 Tuchenhagen Dairy Systems GmbH Procédé et dispositif de guidage du fluide dans les conduits d'un échangeur de chaleur à tubes pour le traitement térmique des suspensions

Also Published As

Publication number Publication date
CN104428620A (zh) 2015-03-18
WO2014006151A1 (fr) 2014-01-09
EP2877799A1 (fr) 2015-06-03

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Owner name: TETRA LAVAL HOLDINGS & FINANCE S.A., SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OLSSON, MICHAEL;CARLSSON, FREDRIK;WIDEN, MATTHIAS;SIGNING DATES FROM 20150325 TO 20150414;REEL/FRAME:035449/0930

STCB Information on status: application discontinuation

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