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
  • F28D7/10—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 one within the other, e.g. concentrically
  • F28D7/12—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 one within the other, e.g. concentrically the surrounding tube being closed at one end, e.g. return type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
  • F23J15/00—Arrangements of devices for treating smoke or fumes
  • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
• • 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
  • F24H9/0084—Combustion air preheating
• • 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
  • 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
  • F28D7/10—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 one within the other, e.g. concentrically
  • F28D7/103—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 one within the other, e.g. concentrically consisting of more than two coaxial conduits or modules of more than two coaxial conduits
• • 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
  • F28F1/02—Tubular elements of cross-section which is non-circular
  • F28F1/022—Tubular elements of cross-section which is non-circular with multiple 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
  • 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
  • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
  • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
  • F28F1/16—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being integral with the element, e.g. formed by extrusion
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
  • F23J2211/00—Flue gas duct systems
  • F23J2211/10—Balanced flues (combining air supply and flue gas exhaust)
  • F23J2211/101—Balanced flues (combining air supply and flue gas exhaust) with coaxial duct arrangement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
  • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
  • F23J2900/13004—Water draining devices associated with flues
• • 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
  • F28F2215/00—Fins
  • F28F2215/06—Hollow fins; fins with internal circuits
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E20/00—Combustion technologies with mitigation potential
  • Y02E20/30—Technologies for a more efficient combustion or heat usage

Definitions

• the present invention relates to a device for recovery of flue-gas heat of a boiler normally used in domestic or industrial environments.
• boilers are thermal apparatuses traditionally used for heating water that is to be introduced into a heating circuit or else that is to be used by the users for personal needs.
• Boilers traditionally comprise a combustion chamber in the proximity of which there is housed a heat exchanger, referred to as primary heat exchanger, having the purpose of providing heating of the water.
• the flue gas produced following upon the phenomenon of combustion possesses, as known, a high thermal energy that can advantageously be recovered in order to pre-heat the water entering the primary heat exchanger. This enables a limitation of the amount of fuel consumed since the thermal jump involved becomes smaller given the same final temperature required of the water leaving the boiler.
• economizers In order to recover said thermal energy, devices for recovery of flue-gas heat, referred to as "economizers”, are traditionally used. They usually comprise heat exchangers, referred to also as secondary heat exchangers, located inside the boiler along the path used for discharge of the flue gas towards the outside.
• the secondary heat exchanger is constituted by a bank of tubes housed in a container within the boiler casing.
• the tubes are traversed internally by water, and the outside of the tubes is lapped by the combustion fumes conveyed inside the container by means of a fan.
• the solution illustrated envisages the use of a partition wall, which, by separating the inlet of the flue gases from the outlet, enables said flue gases to follow a pre-defined path.
• patent application No. EP1243866 illustrates a secondary heat exchanger for boilers made up of a plurality of tubes maintained in their mutual positions through the use of flanges mounted at the ends thereof.
• the flanges are shaped on the outside to enable communication among the different tubes in order to provide a pre-set circuit in which the water is forced to pass.
• a purpose of the present invention is to provide a device for recovery of flue- gas heat that will be made using a limited number of components that can be readily assembled together.
• Another purpose of the present invention is to provide a device for recovery of flue-gas heat that will enable operative connection to the boiler in a fast and simple way.
• a further purpose of the present invention is to provide a device for recovery of flue-gas heat that will be extremely efficient from the functional standpoint.
• a device for recovery of flue-gas of a boiler comprising at least one first tubular element such as to be operatively connected to said boiler and traversed by said flue gas.
• the device is characterized in that it comprises heat-exchanger means housed within said first tubular element in order to transfer the thermal energy of said flue gas to water at lower temperature circulating within said heat-exchanger means.
• the possible location of the device for the recovery of flue-gas heat in a position external to the structure of the boiler certainly represents one of the main advantages of the invention in so far as it enables reduction, for example, of the overall dimensions of the boiler itself since there is no longer required pre-arrangement of spaces inside said boiler for containing heat- exchanger means. These latter are, instead, inserted within a first tubular element advantageously used also as element for discharge of the boiler fumes.
• FIG. 1 is a longitudinal section of a first embodiment of the device for recovery of flue-gas heat according to the invention
• FIG. 2 is an exploded view of heat-exchanger means of the device of Figure 1;
• FIG. 3 is a cross-sectional view according to the line I- 1 indicated in Figure 1;
• FIG. 4 is a longitudinal section of a second embodiment of the device for recovery of flue-gas heat according to the invention.
• FIG. 5 is an exploded view of heat-exchanger means of the device of Figure 4;
• FIG. 6 is a cross-sectional view according to the line IV-IV indicated in Figure 4.
• FIG. 7 is a perspective view of components of the device of Figure 4.
• the device for recovery of flue-gas heat 1 comprises a first tubular discharge element 10, which is operatively connected to a boiler 2 so as to be traversed by the products of combustion, referred to as flue gas, generated within the boiler itself.
• the first tubular element 10 is preferably housed within a second tubular element 20 so as to generate a space 25 for the passage of air from the outside environment into the boiler 2. Once the air is introduced into the boiler 2, it can advantageously be directed towards the combustion chamber so as to be used as supporter of combustion.
• the device 1 is characterized in that it comprises heat-exchanger means housed within the first tubular element 10 and functionally used to transfer the thermal energy of the flue gas to water at a lower temperature circulating within the heat-exchanger means. The water so heated is then sent to the primary heat exchanger of the boiler 2 set up, for example, close to the combustion chamber.
• the device 1 performs a dual function. In fact, it enables discharge of the boiler fumes towards an outer environment and at the same time operates as "economizer" recovering the thermal energy of the flue gas.
• the device 1, as illustrated for example in Figure 1 is advantageously located on the outside of the boiler 2 unlike the traditional technical solutions, in which the heat exchangers, used as economizers, are located in an internal housing. This arrangement of the device 1 on the outside enables, for example, reduction in the dimensions of the boiler 2 or in any case facilitates the design and arrangement of the components inside it with considerable benefits in terms of final production costs.
• the tubular elements 10 and 20 are made of aluminium, and each comprise at least one first rectilinear stretch. As indicated hereinafter, the rectilinear stretch of the first tubular element 10 is designed to house the heat- exchanger means according to the invention.
• the first and second elements 10 and 20 comprise, respectively, a first radius bend 13 and a second radius bend 14, which are operatively connected to the respective rectilinear stretches.
• the two bends 13 and 14 advantageously enable orientation of the device 1 in space according to the service requirements, thus facilitating location of the boiler 2 within the boiler room in which it is installed, hi the solution illustrated in Figure 1, for example, the two bends 13 and 14 enable an orientation of the corresponding rectilinear stretches of the tubular elements 10 and 20 in a substantially horizontal direction with respect to the plane 3 of the boiler 2, in such a way that one end 201 of the tubular elements 10 and 20 comes out of a hole made in the wall 200 of the boiler room.
• the two tubular elements 10 and 20 could be without the radius bends 13 and 14; i.e., they are built in the form of two substantially rectilinear tubes inserted into one another and operatively connected at a free end thereof to the boiler 2.
• the tubular elements 10 and 20 it is possible for the tubular elements 10 and 20 to be operatively connected to the boiler 2 in the proximity of a terminal part of the respective rectilinear stretches in such a way that the device will assume a substantially vertical configuration with respect to the plane 3 of the boiler 2.
• the first and second tubular elements 10 and 20 are operatively connected to the boiler 2 through interposition of an appropriate adapter 5.
• This latter can be stably fixed to the boiler 2 by means of a traditional flange connection 5a, and comprises an outer jacket 6 and an internal core 7, which is housed in the former, so as to generate a prolongation of the space 25 designed for passage of the air.
• the adapter 5 can be connected to the tubular elements 10 and 20 through a coupling referred to as "end coupling", in which the outer jacket 6 couples, in the proximity of a first rim 6a, to a first end 21 of the second tubular element 20, whilst the internal core 7 couples, in the proximity of a second rim 7b, to a second end 11 of the first tubular element 10.
• end coupling in which the outer jacket 6 couples, in the proximity of a first rim 6a, to a first end 21 of the second tubular element 20, whilst the internal core 7 couples, in the proximity of a second rim 7b, to a second end 11 of the first tubular element 10.
• end coupling in which the outer jacket 6 couples, in the proximity of a first rim 6a, to a first end 21 of the second tubular element 20, whilst the internal core 7 couples, in the proximity of a second rim 7b, to a second end 11 of the first tubular element 10.
• the first end 21 and the second end 11 each coincide with
• the end coupling between the adapter 5 and the tubular elements 10 and 20 is specifically obtained by press fit of the first end 21 within the first rim 6a, whilst the second end 11 is instead press fitted within the second rim 7b.
• Seal element 8 are advantageously set between the coupled parts for avoiding mixing in the space 25 of the air and the flue gas that flows inside the first tubular element 10.
• the seal elements can be constituted, for example, by double-lip gaskets such as the ones illustrated in Figure 1.
• Figure 2 illustrates a first possible embodiment of said heat-exchanger means.
• they comprise a tube 30 including one or more longitudinal cavities designed to be traversed by water, hi particular, in the embodiment illustrated, the tube 30 comprises, at least along one stretch thereof, fins shaped so as to define a space 26 for conveying the products of combustion in the longitudinal direction of the tube.
• Figure 3 illustrates in detail an embodiment of the tube 30 that comprises a plurality of longitudinal fins 35, which, viewed on a plane orthogonal to the longitudinal axis of the tube 30, develop according to a sheaf of planes having as centre said longitudinal axis.
• the tube 30 preferably comprises a first longitudinal cavity 31 and a second longitudinal cavity 32, which are separated from one another by a diametral wall 33 so as to enable a flow of the water in the two cavities 31 and 32 according to opposite directions.
• a shaped plug 40 is connected to one end 36 of the tube 30, for example, by means of a threaded connection.
• the shaped plug 40 is provided with a concave internal surface 44 capable of enabling passage of the water from the first cavity 31 to the second cavity 32, i.e., capable of enabling reversal of the flow of water.
• the aforesaid two longitudinal cavities 31 and 32 and the shaped plug 40 by co-operating with one another form a hydraulic circuit within which the water is forced to pass.
• the water is hence heated by heat exchange partially in equicurrent, when the direction of the water flow is concordant with that of the flue gas, and partially in countercurrent, when said direction is opposite.
• the combination of these modalities of heat exchange enables an excellent efficiency of the heat-exchanger means to be achieved, thus favouring energy saving of the boiler.
• the tube 30 can advantageously be made of extruded aluminium and can be chosen with a length that can vary according to the service requirements, i.e. to the degree of heat exchange that it is intended to obtain.
• the tube 30 comprises a first connection 75 and a second connection 76 for introduction and evacuation, respectively, of the water into/from the longitudinal cavities 31 and 32.
• the two aforesaid connections 75 and 76 are preferably connected to a terminal part 39 of the tube 30 opposite to said first terminal part 36.
• the second stretch 39 without fins comes out of the tubular elements 10 and 20 through a passage 45, which is made on the radius bends 13 and 14 and is appropriately integrated with gaskets such as, for example, the seal rings 47 illustrated.
• the first and second connections 75 and 76 are in communication, respectively, with the first longitudinal cavity 31 and the second longitudinal cavity 32 by means of an interface element 100, which is operatively connected to the second stretch 39 without fins on the outside of the tubular elements 10 and 20.
• the interface element 100 is internally hollow with a first annular pocket 101 and a second annular pocket 102, which are respectively connected to the first connection 75 and the second connection 76.
• the first annular pocket 101 is moreover in communication with the first longitudinal cavity 31 of the tube 30 through a first opening 55, and likewise the second annular pocket 102 is in communication with the second longitudinal cavity 32 through a second opening 46.
• Purposely provided O-rings 48 or functionally equivalent gaskets are set between the interface element 100 and the stretch without fins 39 of the tube 30 in order to guarantee tightness of the connection.
• a second arrest plug 41 which has the function of preventing the water from coming out of the longitudinal cavities 31 and 32.
• the arrest plug 41 also favours positioning of the interface element 100, as may be seen, for example, in Figure 1.
• the working principle of the device 1 according to the invention is immediately understandable.
• the water is introduced through the first connection 75 into the first cavity 31, where it is heated by an equicurrent heat exchange.
• the shaped plug 40 the water is then transferred into the second longitudinal cavity 32 and here is further heated by a countercurrent heat exchange.
• the water comes out from the second connection 76 so as to be conveyed to the inlet of the primary heat exchanger, for example via the use of traditional flexible pipes.
• the first tubular element 10 is housed within the second element 20 so that the two axes of symmetry will be mutually inclined at least along the rectilinear stretch.
• This particular arrangement has the purpose of favouring discharge of the condensate, which inevitably forms following upon heat exchange by convection between the fumes and the longitudinal fins 35 of the tube 30.
• the device 1 also comprises a system for discharge of the condensate, which can advantageously be located in the proximity of the adapter 5.
• An example of embodiment, shown in Figure 1 comprises, in particular, an annular basin 9, for collection of the condensate, which is operatively connected to a perforated stub tube 9a.
• the annular basin 9 is defined by the internal core 7 and by a cylindrical wall 9c coaxial thereto.
• the condensate runs along the longitudinal fins 35 of the tube 30 in the direction of the adapter 5, and is then collected in the annular basin 9 and expelled through the perforated stub tube 9a.
• the device 1 according to the invention can advantageously comprise deflectors (not illustrated in the figures) positioned at the start of the rectilinear stretch of the tubular elements.
• the deflectors could be inserted within the first radius bend 13 so as to favour the change of direction of the flue gas, i.e., so as to convey uniformly the flow of the flue gas within the heat-exchanger means.
• Figures 4 to 7 regard a second embodiment of the device 1 according to the invention, which is distinguished from the previous one above all on account of a different structure of the heat- exchanger means and of the two tubular elements 10 and 20.
• the first tubular element 10 has a first stretch 1OA followed by a second stretch 1OB having a smaller radial dimension.
• a converging element 1OC connects the two stretches 1OA and 1OB favouring passage of the products of combustion.
• the heat-exchanger means are located within the first stretch 1OA to exploit the higher thermal content of the flue gas.
• the first stretch 1OA is arranged in a markedly inclined position within the second tubular element 20, which is also divided into a first rectilinear part 2OA and a second rectilinear part 2OB of substantially similar radial dimensions.
• the heat-exchanger means are constituted by a plurality of finned hollow elements 133 located according to a substantially petal-like arrangement on a central stem 130.
• the finned elements 133 are mutually arranged so as to define a space 26 for passage of the products of combustion in a longitudinal direction of the first tubular element 10.
• Each of the finned elements 133 comprises a corresponding longitudinal cavity 133A designed to be traversed by water.
• each element further comprises one or more lateral fins 155 having preferably a curvilinear profile, as illustrated for example in Figure 6. It has been seen that this particular structure of the finned elements 133 enables improvement in the efficiency of the heat exchange and hence in the performance of the device 1 forming the subject of the invention.
• the central stem 130 comprises a plurality of radial seats, in each of which one end of one of the finned elements 133 is inserted. It further comprises a central cavity 130A, which develops longitudinally in order to lighten the structure.
• the central stem 130 and the elements 133 can advantageously be made of extruded aluminium or in any case of another functionally equivalent material.
• the device 1 comprises also in this solution a tube 30 provided with a first cavity and a second cavity separated from one another by a diametral wall to enable a flow of water in two opposite directions.
• a terminal part 39 of the tube 30 comes out of the tubular elements 10 and 20 according to modalities substantially identical to the ones illustrated with reference to the first embodiment of the device 1 according to the invention.
• a second end of the tube 30 is instead operatively connected to the finned elements 133 through a shaped attachment 188 constituted by a cylindrical part 188 A and a shaped part
• Figure 7 is a perspective view that shows in detail the structure of said shaped attachment 188.
• the cylindrical part 188A is connected to the end of the tube 30 through the use of a sleeve
• cylindrical part 188 A is designed to constitute the physical continuation of the tube 30.
• the cavities 199 departs radially from the longitudinal axis of the cylindrical part 188 A and correspond in number to the finned elements 133 in such a way that each of them will constitute the leading part of one of the finned elements 133.
• the shaped part
• first connection means 141 which stably fix the shaped part 188B to the finned elements 133 in such a way that each of . the radial cavities 199 will remain aligned with the cavity 133A of a corresponding finned element 133.
• the first connection means 141 are constituted, for example, by screws or pins which are inserted in seats 185 provided on the shaped part 188B and within the cavity of each element
• the shaped attachment 188 is equipped on the inside with a flow separator 132 (see Figure 7), the purpose of which recalls that of the diametral wall 32 of the tube 30. Via the flow separator 132, the water coming from the first cavity 31 is directed towards a pre-set number of radial cavities 199 and from these is transferred to the cavities of the corresponding finned elements 133.
• the separator 132 selects a first plurality of finned elements 133 A, in which heat exchange occurs in equicurrent, from a second plurality 133B in which heat exchange occurs in countercurrent conditions.
• the shaped attachment 188 is completed by a plug 152, for example cylindrical, which is inserted in a position corresponding to the central cavity 130A of the central stem 130 to prevent inlet of the water.
• the cylindrical plug 152 favours alignment of the shaped attachment 188 with the central stem 130, thus substantially facilitating the operations of assembly of the device 1.
• the device 1 comprises a flow-reversal plug 140 provided inside with interconnected cavities so as to enable communication between the cavities 133A of the finned elements 133.
• the water conveyed by the first plurality of finned elements 133 A is deviated, through the flow-reversal plug 140, towards the cavities 133A of the remaining finned elements 133.
• the flow-reversal plug 140 has a structure similar to that of the shaped part 188B of the shaped attachment 188.
• the flow-reversal plug 140 is connected to the finned elements 133 through second connection means 142 and corresponding seal elements 166 similar in construction and modes of use to the first connection means 191 referred to above.
• the flow-reversal plug 140 can comprise also a central through hole provided for housing means 191 designed to favour anchorage of the heat-exchanger means within the first tubular element 10.
• the technical solutions adopted for the device for discharge of the flue gas enable the pre-set tasks and purposes to be fully achieved.
• the device for recovery and discharge of the flue gas is built with a reduced number of components that can be readily assembled together. Possible location of the device on the outside of the boiler enables a more convenient housing of the other components making up the boiler, in this way limiting the production costs.
• the materials used may be any according to the requirements and the state of the art.

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=36121441

Family Applications (1)

Country Status (3)

Cited By (11)

Citations (11)

• 2004
  • 2004-12-02 IT IT000046A patent/ITBG20040046A1/it unknown
• 2005
  • 2005-12-01 EP EP05850679A patent/EP1828688A1/en not_active Withdrawn
  • 2005-12-01 WO PCT/IB2005/003630 patent/WO2006059215A1/en active Application Filing

Patent Citations (11)

Non-Patent Citations (2)

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