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
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
  • F28F3/12—Elements constructed in the shape of a hollow panel, e.g. with channels
  • F28F3/14—Elements constructed in the shape of a hollow panel, e.g. with channels by separating portions of a pair of joined sheets to form channels, e.g. by inflation
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
  • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels

Definitions

• the present invention relates to a heat exchange device for energy recovery (heat) from combustion fumes and more generally from fluids in the gaseous state having an adequate temperature.
• the present invention relates to a heat exchange device for fumes coming from boilers, steam generators, industrial ovens (and, more generally, from processes in which an effluent in the gaseous state is available for heat exchange) and allows recovery of a part of the heat associated with said fumes which, passing through said device, transfer heat to a second fluid (heat transfer fluid or secondary fluid) which may be in the liquid state and/or two-phase state (liquid and vapor) .
• a second fluid heat transfer fluid or secondary fluid
• heat exchange devices of this type are installed between a boiler and the relative flue and, more generally, on a chimney, and they are able to intercept a part of the energy associated with the gaseous effluent, recover it and reuse it.
• Patent document WO2015004591 describes an apparatus of this type comprising a parallelepiped body having an inlet for the fumes on a face of the parallelepiped, which inside comprises a horizontal heat exchanger and a device for purification of the fumes connected in cascade with each other and an outlet connected to a flue, positioned on the opposite face of the parallelepiped.
• the heat exchanger comprises a plurality of plates, each with a surface with a substantially rectangular shape oriented in the same direction as the fumes.
• Each plate is obtained by two sheets joined together by welding and then subjected to bulging according to a known technique for obtaining channels designed for the passage of the heat transfer fluid; the plurality of plates, enclosed in the parallelepiped body, is lapped externally by the passage of the fumes, thereby creating the heat exchange between the two spaces.
• the heat exchanger of the above-mentioned patent document WO2015004591 has an inlet duct for the heat transfer fluid located on a surface of the parallelepiped and an outlet duct for the fluid located on the opposite surface of the parallelepiped.
• This apparatus is modular in the sense that several parallelepiped bodies may be placed alongside each other .
• the apparatus is constrained to a single positioning, wherein the inlet and outlet of the fumes are located on opposite faces of the same parallelepiped allowing an exclusively linear path for the fumes also due to the presence of the module for purification of the fumes located in cascade with the heat exchanger; the heat transfer fluid is introduced on one face and extracted from the opposite face of the parallelepiped.
• the aim of this invention is to overcome the above- mentioned limitations by proposing a heat exchanger device which is modular and versatile in its installation, in which the inlet and outlet of the fumes can be positioned in various ways.
• An aspect of the present invention concerns a heat exchange device for fumes (gaseous) having the characteristics of the accompanying claim 1.
• Figure 2 illustrates an exploded view of the device according to the present invention
• FIG. 3a illustrates a first embodiment of the device according to the present invention
• Figure 3b illustrates a second embodiment of the device according to the present invention
• Figure 4 illustrates a third embodiment of the device according to the present invention.
• Figure 5a illustrates a fourth embodiment of the device according to the present invention
• Figure 5b illustrates a fifth embodiment of the device according to the present invention
• Figure 6a illustrates a sixth embodiment of the device according to the present invention
• Figure 6b illustrates a seventh embodiment of the device according to the present invention
• Figure 7 illustrates a detail of the tubes for connection of the plates to the inlet (or outlet) duct for the heat transfer fluid according to the present invention
• Figure 8a illustrates a heat transfer plate according to the present invention
• Figures 8b and 8c illustrate the particular arrangement of adjacent plates (valid for all the plates) according to the present invention
• Figure 8d illustrates a heat transfer plate according to the present invention with a detail highlighted and enlarged
• Figure 9 illustrates an eighth embodiment of the device according to the present invention.
• Figure 10 illustrates a ninth embodiment of the device according to the present invention.
• Figures lla-c illustrate, respectively, a front, side and perspective view of a bracket for connecting the plates of the inlet and outlet ducts according to the present invention.
• the device according to the present invention comprises at least one heat exchange module 2 including a plurality of plates 3 each formed by two joined sheets, for example by welding and bulged in order to form inner channels 34 designed for the passage of the heat transfer fluid.
• This module 2 has at least one inlet duct 4 and one outlet duct 5 for the fluid, connected to the channels 34 of the plates through the tubes 35- 36.
• the plurality of plates, enclosed in the parallelepiped body, is lapped externally by the passage of the fumes, thereby creating the heat exchange between the two spaces.
• the device is formed by a box-shaped body, in which is inserted the module, having at least one inlet opening for the fumes 6, 6', 8', which can be operated selectively, located on one of the four faces perpendicular to the plane of parallelism of the plates and at least one outlet opening for the fumes which can also be operated selectively 7 or 7' positioned on any one of the remaining faces in such a way as to form predetermined paths for the fumes inside the module.
• the box-shaped body comprises openable partitions which facilitate the cleaning and inspection operations of the module comprising the plates.
• the inlet opening in some embodiments may be single.
• it can be double, positioned on opposite faces, between the four faces perpendicular to the plane of parallelism of the plates, whilst the single outlet 7 can be positioned on one of the two remaining faces in such a way as to form paths of the fumes which can be selected inside the module .
• Figures 3a to 6b, 9 and 10 illustrate nine embodiments of the invention.
• Figure 3a shows an L-shaped path in which the inlet opening 6' is on a vertical side of the box-shaped body and the outlet opening 7 of the fumes is positioned on the top of the box-shaped body.
• the path is an L-shaped path in which the inlet opening 6' is on a vertical side of the box-shaped body but the outlet opening 7 of the fumes is positioned on the bottom of the box-shaped body .
• a path which is visible in Figure 5a is a vertical rectilinear path, in which the inlet and outlet openings of the fumes are positioned on the lower and upper base of the box-shaped body.
• a further path which can be seen in Figures 6a and 6b is a Z-shaped path in which the inlet opening 6' is on a vertical side of the box-shaped body and the outlet opening 7' of the fumes is positioned on the opposite vertical side of the box-shaped body.
• the path of the fumes shown in Figures 9 and 10 is T- shaped with the two inlet openings on the opposite vertical sides 6' and 8' and the outlet opening 7 is positioned on the top ( Figure 9) or on the lower base of the box-shaped body ( Figure 10) .
• the device according to the present invention is modular in the sense that several devices can be positioned both in cascade and parallel to each other. Moreover, several embodiments can be combined together to allow systems to be constructed which can be positioned in spaces that are sometimes even restricted .
• Each plate 3 is made using a pair of sheets 31 and 32 joined together by junction points 33 and closure of the flaps along the edges of the sheets (for example by welding) , and subsequent mechanical, pneumatic or hydraulic deformation to distance the two sheets at the points not joined (welded) in order to form spaces/channels 34 inside the plate for the passage of the heat transfer fluid.
• Each plate also comprises at least one tube 35 for introduction of the fluid and at least one tube 36 for extraction of the fluid, preferably positioned close to opposite corners of the plate.
• the plates 33 are in construction terms all identical to each other and as such geometrically congruent, they are assembled in the plurality 3 parallel to each other but, at the same time, asymmetrically, so that each of them is rotated by 180° relative to the axis perpendicular to the plane of parallelism of the plates, with respect to the contiguous plate (s) .
• the purpose of this parallel- asymmetric configuration of the plates is to increase the turbulence of the gaseous fluid which passes through the device, with the convex parts of a plate being located in correspondence with concave parts of the contiguous plates ( Figure 8b e 8c) .
• the inlet 35 and outlet 36 tubes of the thermal vector are positioned at different distances (x and y) from the edges (of the plate) contiguous and parallel to the respective tubes 35 and 36, so that following the rotated positioning of two contiguous plates, the same connection tubes are staggered ( Figure 8d) on the duct allowing the plates to be positioned at a close distance: that is, only in this way can the spacing between two contiguous plates be less than the diameter of the tubes 35 and 36.
• the side by side arrangement of two adjacent plates is such as to make the "bulging" parts of the channels 34 of a plate correspond with the "recessed” parts of the adjacent plates at the junction points 33 ( Figure 8c) .
• the positioning of the tubes 35 or 36 for connection of the plates to the input 4 (or output 5) ducts of the heat exchanger is achieved by means of a bracket 9 which has the purpose of compensating for the various thermal expansions to which the plurality of plates 3 are subjected, which are colder because they are crossed by the heat transfer fluid, and the box-shaped body which is at a higher temperature because it is crossed by the hot fumes.
• the bracket is "omega" shaped with the two arms 91, 92 constrained to the box-shaped body, whilst the tubes 35 or 36 are inserted in openings 93 made in the central part of the bracket. The central portion of the omega is then connected with the hydraulic inlet 4 or outlet 5 duct.
• the bracket 9 therefore allows a minimum distance z to be maintained between the edges of the plurality of plates 3 and the box-shaped body, thereby giving a greater compactness and efficiency of the heat exchange, but simultaneously guaranteeing a greater length z' of the tubes 35 and 36 designed for the absorption of the various thermal expansions between the plates and the box-shaped body.
• the versatility and the modularity of the device according to the present invention allows a fuel saving of up to 15%, compared with the 3-5% of the most common applications. In fact, it transforms the traditional boilers, even the oldest ones, into condensing boilers, recovering also the latent heat of condensation as well as the sensible heat.
• the device according to the present invention neither slows down or obstructs in any way the normal transit of the fumes towards the flue thanks to the smooth geometry of the plates and the absence of roughness.
• this geometry determines a turbulence of the fumes such as to allow a high heat transfer. Thanks to the heat exchange efficiency, the device has smaller dimensions than known devices, which therefore allows the installation even in restricted spaces.
• the maintenance is simplified, fast and economic thanks to the partitions which can be easily removed which make the plates completely accessible. This cleaning is possible without having to dismantle the unit from the system or disassembling the plates.

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (5)

Citations (4)

• 2015
  • 2015-09-28 IT ITUB2015A003951A patent/ITUB20153951A1/it unknown
• 2016
  • 2016-09-28 WO PCT/IB2016/055802 patent/WO2017056017A1/en active Application Filing
  • 2016-09-28 EP EP16798272.7A patent/EP3341671B1/en active Active
  • 2016-09-28 PL PL16798272T patent/PL3341671T3/pl unknown
  • 2016-09-28 ES ES16798272T patent/ES2773981T3/es active Active

Patent Citations (4)

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