EP2409105A1 - Tube for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam - Google Patents

Tube for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam

Info

Publication number
EP2409105A1
EP2409105A1 EP10708516A EP10708516A EP2409105A1 EP 2409105 A1 EP2409105 A1 EP 2409105A1 EP 10708516 A EP10708516 A EP 10708516A EP 10708516 A EP10708516 A EP 10708516A EP 2409105 A1 EP2409105 A1 EP 2409105A1
Authority
EP
European Patent Office
Prior art keywords
tube
fins
heat exchange
exhaust gases
steam
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.)
Withdrawn
Application number
EP10708516A
Other languages
German (de)
French (fr)
Inventor
Giovanni Jahier
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.)
Unical AG SpA
Original Assignee
Unical AG SpA
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 Unical AG SpA filed Critical Unical AG SpA
Publication of EP2409105A1 publication Critical patent/EP2409105A1/en
Withdrawn legal-status Critical Current

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
    • 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
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • 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
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • 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
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • 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
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
    • 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
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • 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
    • F28D2021/0024—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion apparatus, e.g. for boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities

Definitions

  • the present invention relates to a tube for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam.
  • Conventional heat exchange devices have tubes designed to convey exhaust gases generated by combustion in adapted furnaces inserted within a vessel that contains the fluid to be heated.
  • Heat exchange devices are known, such as for example certain types of boilers for generating hot water, or boilers for generating steam, in which the exhaust gas conveyance tubes operate in high temperature conditions, with the consequent onset of problems linked to the strength of the materials. Disclosure of the Invention
  • the aim of the present invention is to devise an exhaust gas conveyance tube that can ensure, in addition to high-level heat exchange characteristics, also absolute assurance of operating in safe conditions.
  • a tube for conveying exhaust gases in a heat exchange device, particularly a boiler for generating steam which comprises internally fms in contact with the wall of said tube, characterized in that the fms arranged proximate to the exhaust gas inlet end are made of steel, while the fins arranged proximate to the exhaust gas exit end are made of aluminum.
  • Figure 1 is a sectional view of the tube, taken along a longitudinal plane;
  • Figures 2 and 3 are respectively sectional views taken along the line
  • Figure 4 is a sectional view, taken along a longitudinal plane, of a tube according to another embodiment.
  • the reference numeral 1 generally designates a tube according to the invention, designed to be crossed by the exhaust gases in the direction of the arrow of Figure 1.
  • a turbulator 2 is provided, in a known manner, at the exhaust gas inlet end, and inside the tube fins are provided in contact with the wall of said tube, which according to an important feature of the invention are divided into two groups.
  • the fins, generally designated by the reference numeral 3, of the first group, located proximate to the exhaust gas inlet end, are made of steel, while the fins of the second group, generally designated by the reference numeral 4, located proximate to the exhaust gas exit end, are made of aluminum, and between the two groups of fins there is an interruption portion determined by the presence of a spacer 5.

Abstract

A tube (1) for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam, the tube (1) comprising internally fins (3, 4) in contact with the wall of the tube, the fins (3) arranged proximate to the exhaust gas inlet end being made of steel, while the fins (4) arranged proximate to the exhaust gas exit end are made of aluminum.

Description

TUBE FOR CONVEYING EXHAUST GASES IN HEAT EXCHANGE DEVICES, PARTICULARLY BOILERS FOR GENERETING HOT WATER OR STEAM
Technical Field The present invention relates to a tube for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam. Background Art
Conventional heat exchange devices are known that have tubes designed to convey exhaust gases generated by combustion in adapted furnaces inserted within a vessel that contains the fluid to be heated.
Many types of conventional tubes are provided internally with variously shaped fms in contact with the wall of the tube, and a high transfer of heat from the exhaust gases to the fluid to be heated is thus provided because the fins collect heat from the exhaust gases in the central region, where they are hottest, and transfer it to the wall of the tubes, which is struck by the fluid to be heated at the outer surface.
Heat exchange devices are known, such as for example certain types of boilers for generating hot water, or boilers for generating steam, in which the exhaust gas conveyance tubes operate in high temperature conditions, with the consequent onset of problems linked to the strength of the materials. Disclosure of the Invention
The aim of the present invention is to devise an exhaust gas conveyance tube that can ensure, in addition to high-level heat exchange characteristics, also absolute assurance of operating in safe conditions.
This aim is achieved by a tube for conveying exhaust gases in a heat exchange device, particularly a boiler for generating steam, according to the invention, which comprises internally fms in contact with the wall of said tube, characterized in that the fms arranged proximate to the exhaust gas inlet end are made of steel, while the fins arranged proximate to the exhaust gas exit end are made of aluminum. Brief Description of the Drawings
Further characteristics and advantages of the tube according to the invention will become better apparent from the description of two preferred but not exclusive embodiments thereof, illustrated by way of non-limiting example in the accompanying drawings, wherein:
Figure 1 is a sectional view of the tube, taken along a longitudinal plane; Figures 2 and 3 are respectively sectional views taken along the line
II-II and along the line III-III of Figure 1;
Figure 4 is a sectional view, taken along a longitudinal plane, of a tube according to another embodiment. Ways of carrying out the Invention With reference to the Figures 1 to 3, the reference numeral 1 generally designates a tube according to the invention, designed to be crossed by the exhaust gases in the direction of the arrow of Figure 1.
A turbulator 2 is provided, in a known manner, at the exhaust gas inlet end, and inside the tube fins are provided in contact with the wall of said tube, which according to an important feature of the invention are divided into two groups.
The fins, generally designated by the reference numeral 3, of the first group, located proximate to the exhaust gas inlet end, are made of steel, while the fins of the second group, generally designated by the reference numeral 4, located proximate to the exhaust gas exit end, are made of aluminum, and between the two groups of fins there is an interruption portion determined by the presence of a spacer 5.
In the embodiment of Figure 4 there are again two groups of fins 3 and 4, respectively made of steel and aluminum as in the first described embodiment, and the two groups of fins are arranged without discontinuity. The presence of the steel fins proximate to the exhaust gas inlet end of the tube, where the exhaust gases have a temperature that is too high to allow the use of aluminum fins, ensures the necessary safety while maintaining high heat exchange efficiency, albeit not at an optimum level; this level is reached by means of the aluminum fins inserted proximate to the exhaust gas exit end, where the temperature of the exhaust gases is reduced enough to allow installation of such fins without concerns.
Thus, a good compromise situation has been provided between the need to ensure high heat exchange efficiency to the tube according to the invention and the primary need to operate in conditions of absolute safety.
The tube according to the invention is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may further be replaced with other technically equivalent elements. The disclosures in Italian Patent Application No. MI2009A000404 from which this application claims priority are incorporated herein by reference.
Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims

1. A tube (1) for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam, comprising internally fms (3, 4) in contact with the wall of said tube, characterized in that the fins (3) arranged proximate to the exhaust gas inlet end are made of steel, while the fins (4) arranged proximate to the exhaust gas exit end are made of aluminum.
2. The tube according to claim 1, characterized in that the steel fins (3) and the aluminum fins (4) follow one another without discontinuity.
3. The tube according to claim 1, characterized in that an interruption portion is present between the fins (3) made of steel and the fins (4) made of aluminum.
4. The tube according to claim 1, characterized in that an interruption portion is provided between the fins (3) made of steel and the fms (4) made of aluminum and is determined by the presence of a spacer (5).
EP10708516A 2009-03-17 2010-03-03 Tube for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam Withdrawn EP2409105A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2009A000404A IT1393254B1 (en) 2009-03-17 2009-03-17 TUBE OF CONVEYANCE OF FUMES IN HEAT EXCHANGE APPLIANCES, IN PARTICULAR BOILERS FOR THE PRODUCTION OF HOT WATER OR WATER VAPOR.
PCT/EP2010/052724 WO2010105911A1 (en) 2009-03-17 2010-03-03 Tube for conveying exhaust gases in heat exchange devices, particularly boilers for genereting hot water or steam

Publications (1)

Publication Number Publication Date
EP2409105A1 true EP2409105A1 (en) 2012-01-25

Family

ID=41501529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10708516A Withdrawn EP2409105A1 (en) 2009-03-17 2010-03-03 Tube for conveying exhaust gases in heat exchange devices, particularly boilers for generating hot water or steam

Country Status (3)

Country Link
EP (1) EP2409105A1 (en)
IT (1) IT1393254B1 (en)
WO (1) WO2010105911A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3171116A1 (en) * 2015-11-21 2017-05-24 Linde Aktiengesellschaft Wound heat exchanger comprising turbulators

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050274501A1 (en) * 2004-06-09 2005-12-15 Agee Keith D Decreased hot side fin density heat exchanger
WO2007104580A2 (en) * 2006-03-16 2007-09-20 Behr Gmbh & Co. Kg Heat exchanger for a motor vehicle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000111277A (en) * 1998-10-09 2000-04-18 Toyota Motor Corp Double piping type heat exchanger
JP2000161872A (en) * 1998-11-25 2000-06-16 Toyota Motor Corp Double piping type heat exchanger
JP4345470B2 (en) * 2003-12-18 2009-10-14 いすゞ自動車株式会社 Engine EGR cooler
JP2008008549A (en) * 2006-06-29 2008-01-17 Kitayama Seisakusho:Kk Heat transfer tube and liquid heating device
DE102008014169A1 (en) * 2007-04-26 2009-01-08 Behr Gmbh & Co. Kg Heat exchanger, in particular for exhaust gas cooling, system with a heat exchanger for exhaust gas cooling, method for operating a heat exchanger
KR100999607B1 (en) * 2007-06-05 2010-12-08 기아자동차주식회사 Cooling apparatus and method of exhaust gas recirculation gas

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050274501A1 (en) * 2004-06-09 2005-12-15 Agee Keith D Decreased hot side fin density heat exchanger
WO2007104580A2 (en) * 2006-03-16 2007-09-20 Behr Gmbh & Co. Kg Heat exchanger for a motor vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2010105911A1 *

Also Published As

Publication number Publication date
WO2010105911A1 (en) 2010-09-23
WO2010105911A8 (en) 2010-12-29
IT1393254B1 (en) 2012-04-12
ITMI20090404A1 (en) 2010-09-18

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