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WO2018083036A1 - Échangeur de chaleur - Google Patents

Échangeur de chaleur Download PDF

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Publication number
WO2018083036A1
WO2018083036A1 PCT/EP2017/077632 EP2017077632W WO2018083036A1 WO 2018083036 A1 WO2018083036 A1 WO 2018083036A1 EP 2017077632 W EP2017077632 W EP 2017077632W WO 2018083036 A1 WO2018083036 A1 WO 2018083036A1
Authority
WO
WIPO (PCT)
Prior art keywords
flue gas
heat exchanger
gas duct
insert object
walls
Prior art date
Application number
PCT/EP2017/077632
Other languages
English (en)
Inventor
Hasan TASHACORI
Daniel HOLTROP
René HUITSING
Original Assignee
Bekaert Combustion Technology B.V.
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 Bekaert Combustion Technology B.V. filed Critical Bekaert Combustion Technology B.V.
Publication of WO2018083036A1 publication Critical patent/WO2018083036A1/fr

Links

Classifications

    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F24H1/282—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with flue gas passages built-up by coaxial water mantles
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/30—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle being built up from sections
    • F24H1/32—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle being built up from sections with vertical sections arranged side by side
    • 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
    • F28D21/0007—Water heaters
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0081—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by a single plate-like element ; the conduits for one heat-exchange medium being integrated in one single plate-like element
    • 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
    • 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
    • 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
    • F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow 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
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/022—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being wires or pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/048—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
    • 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
    • F28F9/005—Other auxiliary members within casings, e.g. internal filling means or sealing means
    • 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 heat exchanger comprising a combustion chamber.
  • Such heat exchangers are used in boilers and heating applications.
  • WO2009/053247A1 discloses heat exchangers comprising a heat exchanger body made of light metal or light metal alloy.
  • the body comprises a combustion chamber and a flue gas duct.
  • the flue gas duct is provided for the flow of flue gas generated in the combustion chamber.
  • the body comprises two walls at opposing sides of the flue gas duct. Each of the two walls comprises at least one flow channel for a liquid to be heated via heat transfer from the flue gas.
  • Each of the two walls comprises pins, fins or ribs extending into the flue gas duct.
  • US2014261241A1 discloses a heat exchanger comprising a body made out of light metal or light metal alloy, e.g. aluminum or an aluminum alloy.
  • the body comprises at least a flue gas duct and a combustion chamber.
  • the body comprises two walls at opposite sides of the flue gas duct and of the combustion chamber.
  • the two walls substantially define the flue gas duct and the combustion chamber.
  • the flue gas duct and the combustion chamber define a main flow direction for flue gas between an entry side of the combustion chamber and an outlet of the flue gas duct.
  • Each of the walls comprises a first series of ribs extending into the space between the two walls and has a length direction substantially perpendicular to the main flow direction for flue gas.
  • the first series of ribs defines a meandering flow path of flue gas between the combustion chamber and the outlet.
  • Each of the two walls comprises a second series of ribs extending in the combustion chamber.
  • An open space is provided between the ribs of the second series of the opposite walls.
  • the walls can be made by means of extrusion.
  • EP2278234A1 discloses a heat exchanger comprising a tubular jacket that internally delimits a first duct developed between an inlet section and an outlet section that define an outflow direction for a first fluid; a second duct arranged in thermal contact with the tubular jacket and developed mainly outside the first duct between an inlet mouth and an outlet mouth for a second fluid; heat exchange elements projecting from the tubular jacket towards the inside of the first duct; and a thin body arranged in the first duct parallel to the outflow direction and in thermal contact with one or more heat exchange elements.
  • the first aspect of the invention is a heat exchanger comprising a heat exchanger body made of light metal or light metal alloy.
  • the body comprises a combustion chamber and a flue gas duct.
  • the flue gas duct is provided for the flow of flue gas generated in the combustion chamber.
  • the body comprises two walls at opposing sides of the flue gas duct. Each of the two walls comprises at least one flow channel for a liquid to be heated via heat transfer from the flue gas.
  • Each of the two walls comprises pins, fins or ribs extending into the flue gas duct.
  • the heat exchanger comprises an insert object provided in the flue gas duct.
  • the insert object is an elongated object.
  • the insert object makes contact with pins, fins or ribs of each of the two walls at opposing sides of the flue gas duct.
  • the insert objects comprise a part with a V- or wedge shaped cross section, with the bottom of the V- or wedge shape oriented in the average flue gas flow direction of the flue gas duct.
  • the insert object is removably provided in the heat exchanger.
  • the presence of the insert object in the heat exchanger has the technical effect that flue gas is diverted in the flue gas duct such that more flue gas flows closer to the walls.
  • the V- or wedge shape ensures an efficient redirection of flue gas in the flue gas channel.
  • the insert object makes contact with pins, fins or ribs of both opposing walls.
  • Such contact ensures that all flue gas flow is diverted so that it flows between the pins, fins or ribs, for efficient heat transfer, as no or only a small amount of flue gas flows through open zones between the pins, fins or ribs of the opposed walls.
  • the insert object is heated by contact with the flue gas flow and transfers its energy via conduction to the walls of the flue gas channel.
  • the combined, synergistic result of the effects is increased heat transfer of flue gas to the liquid flowing through the flow channels in the walls, and increased efficiency of the heat exchanger. Even more important, the capacity - in terms of kW transferred from the flue gas to fluid to be heated - of the heat exchanger can be increased, meaning that a smaller heat exchanger can be used for a high capacity.
  • light metal is at least to be understood as including non-ferrous metal and non-ferrous metal alloy having a density of less than 4500 kg/m 3 .
  • Preferred materials are aluminum and aluminum alloy.
  • the two walls can e.g. be made via casting in a similar way as is known from e.g.
  • the heat exchanger body is a cast monobloc.
  • the heat exchanger body comprises segments, e.g.
  • the insert object comprises or is an elongated object with constant cross section over its length.
  • the length direction of the elongated object is provided perpendicularly to the average flue gas flow direction in the flue gas duct.
  • a number of elongated insert objects are used.
  • the number of elongated insert objects (e.g. 2, e.g. 3) is provided one after the other in the length direction of the elongated insert objects.
  • Such approach facilitates insertion and - if required - removal of the insert objects, via the combustion chamber.
  • the insert object is provided in the flue gas duct in the zone connecting the combustion chamber to the flue gas duct. Consequently the insert object is provided in the zone where the flue gas is at a high temperature. Because of the high temperature of the flue gas, it is advantageous to try to extract maximum heat from the flue gas in this zone. However, also because of the high flue gas temperature, limitations exist for the ways to extract more heat from the flue gas flow in this zone. Longer pins, fins or ribs could be envisaged, but carry the risk of lower lifetime of the heat exchanger, because the pins, fins or ribs could become overheated.
  • the insert object is provided in the flue gas duct in a zone where the distance between pins, fins or ribs of the two walls at opposing sides of the flue gas duct decreases in flue gas downstream direction.
  • the insert object is provided in the flue gas duct in a zone where the pins, fins or ribs increase in length in the flue gas downstream direction.
  • the upper part of the insert object is positioned at a distance from the combustion chamber larger than 25% of the height of the insert object, more preferably larger than 33% of the height of the insert object. It has surprisingly been observed that such embodiments provide more favorable results in terms of performance of the heat exchanger over lifetime.
  • the insert object is provided in the flue gas duct in a zone where the distance between the two walls decreases in flue gas downstream direction.
  • Preferred insert objects are made out of a material that has a higher temperature resistance than the light metal or light metal alloy out of which the body is made.
  • the insert object could be made out of or comprising aluminum or an aluminum alloy, such approach could have negative effects at high flue gas temperatures, as drops of molten aluminum or aluminum alloy could drip from the insert object.
  • Even more preferred insert objects comprise or consist out of stainless steel, e.g. ferritic stainless steel or austenitic stainless steel. The use of ferritic stainless steel for the insert object is especially preferred, because of its longevity in the application, because of the absence of galvanic corrosion between aluminum of the pins, fins or ribs and the ferritic stainless steel of the insert object.
  • Preferred insert objects comprise or are made from a metal plate bent to shape. It is e.g. possible to provide insert objects with a closed shape by bending the metal plate into a closed shape and welding the touching or overlapping parts of the bent metal plate. It is also possible to use more than one metal plate, e.g. to bend one or more than one of the metal plates and weld or otherwise bond the plates together.
  • the insert object comprising a V- or wedge shape segment can be open or closed at the side oriented towards the combustion chamber.
  • an insert object closed at the side oriented towards the combustion chamber is preferred as it provides better results.
  • a cross section comprising a V-shape or wedge shape closed at the top by a rounded top section is preferred.
  • a further preferred example is an insert object comprising a V-shape cross section at its bottom and a closing rounded top section, e.g. made by bending a metal plate over a rod and welding the plate ends to each other to form the bottom of the V-part of the cross section. Further preferred is when the largest width of the V-shape cross section is between 25 and 50 % of the height of the insert object.
  • each of the two legs of the V-or wedge shape makes contact with pins, fins or ribs of each of the two walls at opposing sides of the flue gas duct.
  • Preferred insert objects have a cross section that is concave, open towards the combustion chamber.
  • the insert object can e.g. have a V-shaped cross section, wherein the open side of the V-shape is positioned towards the combustion chamber.
  • Such insert object can e.g. comprise two metal sheets bonded in V-shape to each other, e.g. by means of welding.
  • Preferred insert objects comprise a part with a convex rounded cross section, wherein the convex rounded shape is oriented towards the combustion chamber. Such embodiments are particularly preferred as they provide optimum beneficial results from the use of the insert object.
  • Preferred insert objects are hollow objects having a constant cross section along their length.
  • insert objects having a massive body are not excluded for the invention, the use of hollow objects as insert objects is preferred, as they function better, especially when the capacity of the heat exchanger is increased.
  • Insert objects having a massive body can show - at high capacity - issues because of thermal stresses due to differences in thermal expansion coefficient between the insert object and the light metal or light metal alloy of the body of the heat exchanger.
  • Hollow objects used as insert objects have shown to be better able to cope with operation at high capacity.
  • hollow objects as insert bodies are preferred over insert objects having a concave cross section, in that the latter are less suited for high capacity operations. Hollow objects function better at high capacity operation as they are better resisting thermal stresses that could deform insert objects having a concave cross section, which could cause gaps in the flue gas channel creating preferential short cuts for the flue gas to flow.
  • the insert object is a hollow object having a constant cross section along its length
  • a cross section that has a drop shape with the rounded part of the drop shape oriented towards the combustion chamber.
  • the hollow drop shape cross section embodiment is particularly preferred, because it has shown to be particularly suited to increase efficiency and capacity of the heat exchanger.
  • the insert object is held in its position in the heat exchanger by gravitational forces only. It is a benefit of such embodiments that the insert object can be easily removed out of the heat exchanger, e.g. when maintenance of the heat exchanger is required.
  • a preferred heat exchanger comprises a multiple number of flue gas ducts in flue gas flow connection with the combustion chamber.
  • the flue gas ducts are parallel with each other.
  • the flue gas ducts are perpendicular to the longitudinal direction of the combustion chamber.
  • the body comprises at opposing sides of each of the flue gas duct two walls.
  • Each of the two walls comprises at least one flow channel for a liquid to be heated via heat transfer from the flue gas.
  • Each of the two walls comprises a series of pins, fins or ribs extending into the flue gas duct.
  • An insert object is provided in each flue gas duct.
  • the insert objects are elongated objects. The insert object makes contact with pins, fins or ribs of both opposing walls.
  • a second aspect of the invention is a heat cell for heating a fluid by means of flue gas generated in a combustion chamber.
  • the heat cell comprises a heat exchanger as in any embodiments of the first aspect of the invention; and a burner, preferably a premix gas burner, more preferably a surface stabilized premix gas burner, provided in the combustion chamber for the generation of flue gas.
  • the heat cell is a condensing heat cell.
  • Figures 1 and 2 show examples of cross sections of insert objects that can be used in the invention.
  • Figure 3 shows comparative NOx results.
  • Figure 4 shows an example of a heat exchanger according to the first aspect of the invention.
  • Figure 5 shows an example of a heat cell according to the second aspect of the invention. Mode(s) for Carrying Out the Invention
  • FIG. 1 shows the cross section 180 of a first example of an insert object that can be used in the invention.
  • the insert object is an elongated object with a constant cross section along its length.
  • the insert object is a hollow object, having a drop shape cross section.
  • the cross section comprises a part 182 that has a V-shaped cross section and a part 184 with a convex rounded cross section.
  • the insert object can be made out of plate metal, e.g. out of stainless steel (e.g. out of ferritic stainless steel), by bending a metal plate over a rod and welding the legs together at the bottom of the V- shaped part of the insert object.
  • the maximum width W of the insert object can be 1/3 of its height H.
  • FIG. 2 shows the cross section 280 of a second example of an insert object that can be used in the invention.
  • the cross section of the insert object has a V-shape.
  • the bottom of the V- shape is preferably oriented in the average flue gas flow direction of the flue gas duct.
  • the insert object can be made by bending two metal plates (e.g. stainless steel plates) so that they each form a leg of the V-shape, and welding the legs together at the bottom of the V-shape.
  • the maximum width W of the insert object can be 40% of its height H. It is possible to hold the insert in position in a heat exchanger according to the invention by means of elastic forces of the blades of the V-shape.
  • FIG. 4 shows an example of a heat exchanger 400 according to the second aspect of the invention.
  • the heat exchanger comprises a heat exchanger body comprising a multiple number of flue gas ducts 402 in flue gas flow connection with the combustion chamber 404.
  • a surface stabilized premix gas burner (not shown in figure 4) can be provided in the combustion chamber, thereby providing a heat cell according to the second aspect of the invention.
  • the heat exchanger body comprises at opposing sides of each of the flue gas duct two walls 406.
  • Each of the two walls comprises at least one flow channel 407 for a liquid to be heated via heat transfer from the flue gas.
  • Each of the two walls comprises a series of pins 410 extending into the flue gas duct.
  • the heat exchanger can e.g.
  • An insert object 480 is provided in each flue gas duct.
  • the insert object 480 is an elongated object making contact with pins of both opposing walls.
  • an insert object as in figure 1 is used.
  • the insert object is held in position in the heat exchanger by gravitational forces only.
  • the insert object is provided in the flue gas duct 402 in a zone wherein the distance between pins of the two walls 406 at opposing sides of the flue gas duct 402 decreases in flue gas downstream direction.
  • the insert object is provided in the flue gas duct 402 in a zone where the pins 410 increase in length in the flue gas downstream direction.
  • the upper part of the insert object is positioned at a distance D from the combustion chamber; the distance D is half of the height H of the insert object.
  • Figure 3 shows in the Y-axis the amount of NOx, expressed in mg NOx per kWh of the heat cell, measured in the flue gas of the heat cell when operating the heat cell at different percentage C0 2 in the flue gas (X-axis), comparing the heat cell without insert object (results A) and the heat cell with the insert object (B).
  • FIG. 5 shows an example of a heat cell 500 according to the second aspect of the invention.
  • the heat cell comprises a heat exchanger 501.
  • the heat exchanger comprises a heat exchanger body, in the example a monocast casted from an aluminum alloy.
  • the body comprises a combustion chamber 504 and a flue gas duct 502.
  • a surface stabilized gas premix burner 503 is provided in the combustion chamber 504.
  • the flue gas duct 502 is provided for the flow of flue gas generated by the burner 503 in the combustion chamber.
  • the body comprises two walls 506 at opposing sides of the flue gas duct .Each of the two walls comprises a flow channel 507 for water to be heated via heat transfer from the flue gas.
  • Each of the two walls 506 comprises pins 510 extending into the flue gas duct.
  • the heat exchanger 501 comprises an insert object 580 provided in the flue gas duct.
  • the insert object 580 is an elongated object making contact with pins 510 of each of the two walls 506 at opposing sides of the flue gas duct 502.
  • an insert object 580 as in figure 1 is shown, although other insert objects can be used, e.g. the insert objects shown in figures 2 and 3.
  • the insert object 580 is provided in the flue gas duct 502 in a zone where the distance between pins 510 at opposing sides of the flue gas duct increases in flue gas downstream direction.
  • the insert object is provided in the flue gas duct 502 in a zone wherein the distance between the two walls narrows in flue gas downstream direction.

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

Abstract

Échangeur de chaleur comprenant un corps d'échangeur de chaleur composé de métal léger ou d'un alliage de métal léger. Le corps comprend une chambre de combustion et un conduit de gaz de combustion. Le conduit de gaz de combustion est prévu pour l'écoulement de gaz de combustion produit dans la chambre de combustion. Le corps comprend deux parois sur des côtés opposés du conduit de gaz de combustion. Chacune des deux parois comprend au moins un canal d'écoulement pour un liquide à chauffer par transfert de chaleur à partir du gaz de combustion. Chacune des deux parois comprend des broches, des ailettes ou des nervures s'étendant dans le conduit de gaz de combustion. L'échangeur de chaleur comprend un objet inséré disposé dans le conduit de gaz de combustion. L'objet inséré est un objet allongé. L'objet inséré entre en contact avec les broches, les ailettes ou les nervures de chacune des deux parois sur des côtés opposés du conduit de gaz de combustion. L'objet inséré comprend une partie ayant une section transversale en forme de V ou cunéiforme, le fond de la forme en V ou cunéiforme étant orienté dans la direction d'écoulement de gaz de combustion moyenne du conduit de gaz de combustion.
PCT/EP2017/077632 2016-11-04 2017-10-27 Échangeur de chaleur WO2018083036A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16197214 2016-11-04
EP16197214.6 2016-11-04

Publications (1)

Publication Number Publication Date
WO2018083036A1 true WO2018083036A1 (fr) 2018-05-11

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PCT/EP2017/077632 WO2018083036A1 (fr) 2016-11-04 2017-10-27 Échangeur de chaleur

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0373027A1 (fr) * 1988-12-02 1990-06-13 GEMINOX, Société Anonyme Chaudière à condensation pour chauffage à fluide caloporteur
GB2441183A (en) * 2007-04-16 2008-02-27 Enertek Internat Ltd A heat exchanger for use in a condensing boiler
WO2009053247A1 (fr) 2007-10-25 2009-04-30 Bekaert Combust. Technol. B.V. Elément échangeur de chaleur avec chambre de combustion pour un dispositif de combustion à faible émission de co et de nox
EP2278234A1 (fr) 2009-06-30 2011-01-26 Stefano Zanforlin Échangeur de chaleur, notamment pour chaudière à condensation
US20140261241A1 (en) 2013-03-12 2014-09-18 Dejatech Ges B.V. Heat exchanger and body therefore, and a method for forming a heat exchanger body

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0373027A1 (fr) * 1988-12-02 1990-06-13 GEMINOX, Société Anonyme Chaudière à condensation pour chauffage à fluide caloporteur
GB2441183A (en) * 2007-04-16 2008-02-27 Enertek Internat Ltd A heat exchanger for use in a condensing boiler
WO2009053247A1 (fr) 2007-10-25 2009-04-30 Bekaert Combust. Technol. B.V. Elément échangeur de chaleur avec chambre de combustion pour un dispositif de combustion à faible émission de co et de nox
EP2278234A1 (fr) 2009-06-30 2011-01-26 Stefano Zanforlin Échangeur de chaleur, notamment pour chaudière à condensation
US20140261241A1 (en) 2013-03-12 2014-09-18 Dejatech Ges B.V. Heat exchanger and body therefore, and a method for forming a heat exchanger body

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