EP0752088B1 - Wärmetauscherrohr für heizkessel - Google Patents

Wärmetauscherrohr für heizkessel Download PDF

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Publication number
EP0752088B1
EP0752088B1 EP95913118A EP95913118A EP0752088B1 EP 0752088 B1 EP0752088 B1 EP 0752088B1 EP 95913118 A EP95913118 A EP 95913118A EP 95913118 A EP95913118 A EP 95913118A EP 0752088 B1 EP0752088 B1 EP 0752088B1
Authority
EP
European Patent Office
Prior art keywords
outer tube
heat exchanger
tube
ribs
half shells
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.)
Expired - Lifetime
Application number
EP95913118A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0752088A1 (de
Inventor
Wolfgang Kunkel
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.)
Hoval Interliz AG
Original Assignee
Hoval Interliz AG
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 Hoval Interliz AG filed Critical Hoval Interliz AG
Publication of EP0752088A1 publication Critical patent/EP0752088A1/de
Application granted granted Critical
Publication of EP0752088B1 publication Critical patent/EP0752088B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F28F21/08—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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0026—Guiding means in combustion gas 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
    • 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
    • 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
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/14—Fastening; Joining by using form fitting connection, e.g. with tongue and groove

Definitions

  • the invention relates to a heat exchanger tube for boilers, in particular for gas condensing boilers, according to the preamble of claim 1.
  • heat exchanger tubes which consist of a cylindrical, smooth-walled outer tube made of steel which is acid-corrosion-resistant against the exhaust gas condensate and a profile insert made of aluminum which is inserted into the outer tube and has a star-shaped cross section.
  • the outer tube must be made of steel in order to be welded at its ends into tube sheets or tube plates that separate the boiler water space surrounding the heat exchanger tubes from the combustion chamber on the one hand and from the boiler's flue gas collector on the other.
  • the composite pipe made of steel outer pipe and aluminum profile insert can be subjected to high gas inlet temperatures because aluminum has a greater coefficient of expansion than steel, so that the profile insert remains in heat-conducting contact at its contact points with the outer tube with an increasing pressure as the temperature rises.
  • the heat transfer from the star-shaped aluminum profile insert to the steel outer tube is determined and limited by the fact that the profile insert only touches the outer tube on the comb surfaces of the radial arms of the profile insert, which are relatively thin-walled in cross section to provide sufficient clearance Leave cross-section in the outer tube for the combustion gas flow.
  • the invention has for its object to provide a heat exchanger tube of the type mentioned, which enables an even greater heat transfer capacity from the combustion gases to the boiler water and can be easily manufactured and further processed when installed in a boiler.
  • the invention achieves this object by designing the heat exchanger tube, which is constructed as a composite tube made of a steel outer tube and an aluminum profile insert, with the features of claim 1.
  • the tubular-shaped profile insert of the heat exchanger tube according to the invention can, on the one hand, be formed with a very large inner surface, which absorbs heat from the combustion gases, preferably with ribs arranged in comb-like manner on the inside on the two half-shells, and lies above all in comparison with the known star profiles with a much larger outer surface on the inside of the water-cooled steel outer tube, whereby the heat transfer capacity from the combustion gases to the boiler water is significantly increased.
  • the brevity of the heat exchanger tube leads to the further significant advantage that the condensing boiler can be made lower overall with the vertical arrangement of the heat exchanger tubes or shorter and thus more space-saving when the heat exchanger tubes are arranged horizontally.
  • the tubular-shaped profile insert can be easily and inexpensively manufactured by dividing it into two half-shells and by designing each half-shell with its ribs as a profile open on one side. For the production by extrusion, no so-called flying cores are required in the drawing die, which is therefore cheap and also durable.
  • a particular advantage for the processing of the heat exchanger tube according to the invention or for its installation in a boiler has been found to be that when the outer tube is welded into a tube plate, thanks to the extremely large heat transfer contact area and heat dissipation of the profile insert no destruction of the aluminum profile insert occurs if the end of the profile insert reaches flush to the end of the outer tube to be welded into the tube plate.
  • the heat exchanger tube therefore does not need to be manufactured with the profile insert ends set back relative to the outer tube ends, but can be separated from the long meter goods produced in the required length for installation in a boiler with a simple straight cut.
  • the heat exchanger tube can be produced in a simple manner so that the tube body has an outer diameter which essentially corresponds to the inner diameter of the outer tube and only in this way is slightly smaller that the tubular body can be easily pushed into the outer tube, and that the outer tube is then radially compressed by a permanent compression deformation of the entire outer tube circumference, for example by a rolling or drawing process, and pressed against the aluminum profile insert.
  • the contacting longitudinal edges of the two half-shells as well as the tubular body and the outer tube are pressed together so tightly that no gap is present. This is also important for the end faces of the ends of the heat exchanger tube that protrude through the tube plates, so that there is no exhaust gas or condensate between the tube body of the aluminum profile insert and the steel outer tube can penetrate.
  • the heat exchanger tube shown in Figure 1 consists of a cylindrical smooth-walled outer tube 1 made of a corrosion-resistant chrome steel and a profile insert 2 made of aluminum.
  • the profile insert 2 is formed by a tubular body which is divided into two half-shells 3, 4 in a plane of division running through the longitudinal axis of the outer tube.
  • the two half-shells 3, 4 are formed with ribs 5, which extend in the longitudinal direction of the outer tube 1 and protrude into the clear cross section of the tubular body such that each half-shell 3, 4 with its ribs 5 forms a profile open on one side, so that the half-shells with their ribs can be produced easily and cheaply with an extrusion tool or a drawing die without a so-called flying core.
  • the ribs 5, as the embodiment of FIG. 1 shows, are arranged in a comb-like manner and perpendicular to the division plane on the inside of the two half-shells 3, 4, the ribs 5 of the two half-shells 3, 4 lying opposite one another in pairs and extend to or at least close to the parting plane.
  • the ribs in the extrusion of the half-shells can be provided with a corrugated surface profile running in the longitudinal direction of the outer tube 1 or the half-shells 3, 4, which provides a very effective enlargement of the heat-absorbing inner surface of the profile insert which is subjected to the combustion gases 2 results.
  • the two half-shells 3, 4 are formed with groove-shaped depressions 7 and rib-like projections 8, which can be plugged into one another perpendicular to the dividing plane and with which the longitudinal edges engage in the manner of a labyrinth seal.
  • the sealing of the two joints between the half-shell longitudinal edges is important so that no gap arises, through which exhaust gas or condensate penetrates between the tubular body of the profile insert 2 and the outer tube 1 and there leads to crevice corrosion. If the two half-shells, as illustrated in FIG.
  • FIG. 1 shows the heat exchanger tube in a state that has not yet been finally completed.
  • the tubular body assembled from the two half-shells 3, 4, which in the exemplary embodiment of FIG. 1 lies directly on its entire circumferential surface on the outer tube 1, is produced with an outer diameter which is slightly smaller than the inner diameter of the outer tube, so that the tubular body or Insert profile insert 2 without any problems into the outer tube leaves.
  • the outer tube is then subjected to a permanent radial compression deformation on its entire circumference by a rolling or drawing process, in order to press the outer tube and the profile insert against one another, for intensive contact of the entire outer tube inner surface and the entire profile insert outer surface, which is important for heat transfer.
  • a permanent radial compression deformation on its entire circumference by a rolling or drawing process in order to press the outer tube and the profile insert against one another, for intensive contact of the entire outer tube inner surface and the entire profile insert outer surface, which is important for heat transfer.
  • the gap-free compression of the outer tube and profile insert on the contacting circumferential surfaces also prevents exhaust gas or condensate from penetrating between the outer tube and the profile insert on the end face of the heat exchanger tube installed in a boiler.
  • the extremely high heat transfer capacity of the heat exchanger tube between the profile insert and the outer tube also has a surprisingly advantageous effect for the reverse heat flow when welding the heat exchanger tube ends into tube sheets or tube plates of a boiler. Welding tests have shown that even with the flush end of the aluminum profile insert with the chrome steel outer tube, the aluminum is surprisingly not damaged or melts away, although the chrome steel outer tube must be connected to the tube plate of the boiler with liquid welding material melt.
  • the heat exchanger tube can therefore be separated from the finished fabric of the heat exchanger tube in the lengths required for a boiler with a simple straight cut or saw cut or the like.
  • FIG. 2 shows an exemplary embodiment similar to FIG. 1, in which the tips of the ribs 5 arranged in the manner of a comb have such a distance from one another comply with the fact that a plate-shaped flat profile 9 made of aluminum can be inserted between the tips.
  • the rib length is dimensioned such that when the half-shells 3, 4 are joined together to form the tubular profile insert, the comb tips with their end faces corresponding to the rib cross section are pressed tightly and without gaps onto the flat profile 9 in order to produce a reliably heat-conducting contact between the flat profile and the ribs.
  • the contacting longitudinal edges of the two half-shells can be designed so that they enclose the longitudinal edges of the flat profile and clamp between them on the heat exchanger tube which has been produced in a heat-conducting manner.
  • the heat-absorbing inner surface of the profile insert 2 can be enlarged again in a simple and inexpensive manner by a considerable amount in the order of 10% or more.
  • FIG. 3 shows an exemplary embodiment in which the aluminum profile insert 2 of the type of FIG. 1 does not directly touch the inside of the outer tube 1 with its outer side, but rather has an outer diameter which is significantly less than the inner diameter of the outer tube 1.
  • An annular cylindrical intermediate profile 10 made of aluminum is arranged in the annular space thus formed between the outer tube 1 and the profile insert 2.
  • This intermediate profile 10 consists of a tube wall, which rests with its entire outer circumferential surface on the entire inner surface of the outer tube 1 in a heat-conducting manner, and a plurality of ribs 11 arranged radially on the inside of the tube body, which extend to the outside of the profile insert 2 and the outside touch the profile insert flat and heat conductive.
  • the intermediate profile 10 is divided into two intermediate profile halves open on one side in a division plane running through the outer tube longitudinal axis, which can also be produced with a simple drawing die without a flying core by extrusion of aluminum.
  • the intermediate profile 10 is designed similarly to the profile insert 2 described with reference to FIG. 1 with sealingly contacting or interlocking longitudinal edges of the two intermediate profile halves.
  • the embodiment of FIG. 3 can increase the total internal surface of the heat exchanger tube that is touchable and heat-absorbing by the combustion gases by a good 100%.
  • the length of the heat exchanger tube can be shortened even further in order to cool the combustion gases in an condensing boiler from an inlet temperature of, for example, 850 ° C. to an outlet temperature of, for example, 48 ° C., which is clearly below the dew point limit of the combustion gases.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Geometry (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Fluid Heaters (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Air Supply (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP95913118A 1994-03-24 1995-03-15 Wärmetauscherrohr für heizkessel Expired - Lifetime EP0752088B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9405062U 1994-03-24
DE9405062U DE9405062U1 (de) 1994-03-24 1994-03-24 Wärmetauscherrohr für Heizkessel
PCT/EP1995/000957 WO1995025937A1 (de) 1994-03-24 1995-03-15 Wärmetauscherrohr für heizkessel

Publications (2)

Publication Number Publication Date
EP0752088A1 EP0752088A1 (de) 1997-01-08
EP0752088B1 true EP0752088B1 (de) 1997-11-26

Family

ID=6906491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95913118A Expired - Lifetime EP0752088B1 (de) 1994-03-24 1995-03-15 Wärmetauscherrohr für heizkessel

Country Status (26)

Country Link
US (1) US6070657A (fi)
EP (1) EP0752088B1 (fi)
JP (1) JP3016866B2 (fi)
KR (1) KR100217265B1 (fi)
CN (1) CN1120347C (fi)
AT (1) ATE160628T1 (fi)
AU (1) AU678713B2 (fi)
CA (1) CA2186270C (fi)
CZ (1) CZ286145B6 (fi)
DE (2) DE9405062U1 (fi)
DK (1) DK0752088T3 (fi)
EE (1) EE03318B1 (fi)
ES (1) ES2112055T3 (fi)
FI (1) FI107835B (fi)
GR (1) GR3026039T3 (fi)
HR (1) HRP950131B1 (fi)
HU (1) HU220435B (fi)
LV (1) LV12025B (fi)
NO (1) NO303151B1 (fi)
NZ (1) NZ282800A (fi)
PL (1) PL178916B1 (fi)
RU (1) RU2125219C1 (fi)
SK (1) SK281996B6 (fi)
TR (1) TR28643A (fi)
UA (1) UA26941C2 (fi)
WO (1) WO1995025937A1 (fi)

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DE102022108336A1 (de) 2022-04-06 2023-10-12 Lisa Dräxlmaier GmbH Stromschiene mit passiver kühlung
DE102022108335A1 (de) 2022-04-06 2023-10-12 Lisa Dräxlmaier GmbH Stromschiene mit aktiver kühlung

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022108336A1 (de) 2022-04-06 2023-10-12 Lisa Dräxlmaier GmbH Stromschiene mit passiver kühlung
DE102022108335A1 (de) 2022-04-06 2023-10-12 Lisa Dräxlmaier GmbH Stromschiene mit aktiver kühlung

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HRP950131A2 (en) 1997-02-28
NO303151B1 (no) 1998-06-02
DK0752088T3 (da) 1998-08-10
CN1144558A (zh) 1997-03-05
CA2186270C (en) 2000-06-13
FI963772A0 (fi) 1996-09-23
SK281996B6 (sk) 2001-10-08
AU2070895A (en) 1995-10-09
ES2112055T3 (es) 1998-03-16
DE9405062U1 (de) 1994-05-26
EE03318B1 (et) 2000-12-15
PL178916B1 (pl) 2000-06-30
KR100217265B1 (ko) 1999-09-01
NO963993L (no) 1996-09-23
TR28643A (tr) 1996-12-16
JPH09507708A (ja) 1997-08-05
PL316389A1 (en) 1997-01-06
CZ261396A3 (en) 1996-12-11
FI107835B (fi) 2001-10-15
HRP950131B1 (en) 2000-10-31
FI963772A (fi) 1996-09-23
JP3016866B2 (ja) 2000-03-06
GR3026039T3 (en) 1998-04-30
DE59501046D1 (de) 1998-01-08
EP0752088A1 (de) 1997-01-08
HU220435B (hu) 2002-01-28
SK116596A3 (en) 1998-10-07
NZ282800A (en) 1997-03-24
HUP9774653A2 (en) 1997-01-28
CZ286145B6 (cs) 2000-01-12
LV12025A (lv) 1998-04-20
WO1995025937A1 (de) 1995-09-28
US6070657A (en) 2000-06-06
ATE160628T1 (de) 1997-12-15
HU9602608D0 (en) 1996-11-28
RU2125219C1 (ru) 1999-01-20
AU678713B2 (en) 1997-06-05
CA2186270A1 (en) 1995-09-28
KR970701851A (ko) 1997-04-12
UA26941C2 (uk) 1999-12-29
LV12025B (lv) 1998-07-20
CN1120347C (zh) 2003-09-03
NO963993D0 (no) 1996-09-23

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