EP1906085A2 - Régénérateur pour chauffe-eau et chauffe-eau doté dudit générateur - Google Patents

Régénérateur pour chauffe-eau et chauffe-eau doté dudit générateur Download PDF

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Publication number
EP1906085A2
EP1906085A2 EP20070102665 EP07102665A EP1906085A2 EP 1906085 A2 EP1906085 A2 EP 1906085A2 EP 20070102665 EP20070102665 EP 20070102665 EP 07102665 A EP07102665 A EP 07102665A EP 1906085 A2 EP1906085 A2 EP 1906085A2
Authority
EP
European Patent Office
Prior art keywords
regenerator
heat
boiler
exchange elements
fumes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20070102665
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German (de)
English (en)
Inventor
Marco Rapaccioli
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.)
G20 Engineering Srl
Original Assignee
G20 Engineering Srl
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 G20 Engineering Srl filed Critical G20 Engineering Srl
Publication of EP1906085A2 publication Critical patent/EP1906085A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnaces, fire tubes or flue ways
    • F22D1/04—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnaces, fire tubes or flue ways the tubes having plain outer surfaces, e.g. in vertical arrangement

Definitions

  • the present invention relates to a regenerator for domestic or industrial boilers and to a boiler comprising said regenerator.
  • regenerators are heat exchangers that are used for pre-heating the water that is to supply a boiler. Since they are heat exchangers they enable transfer of a certain quantity of thermal energy from one fluid that is a vector of heat to a colder one without there being the contact between the two fluids.
  • the vector fluid is constituted by the fumes of the boiler generated following upon combustion, whilst the colder fluid is constituted by water that is to flow into another heat exchanger, referred to as primary heat exchanger, which definitively heats the water before this is distributed to the water-using devices.
  • regenerators are usually made up of a plurality of tubes provided in a containment structure and internally traversed by the water coming from a mains or distribution network.
  • the tubes are externally lapped by the hot fumes, which transfer part of their thermal content to the water, in this way increasing the temperature thereof.
  • the heat exchange is obtained through the walls of the tubes, which for this reason are made of metal material.
  • the primary task of what forms the subject of the present invention is to provide a regenerator for a domestic or industrial boiler that will enable the drawback referred to be overcome.
  • a purpose of the present invention is to provide a regenerator with low thermal dispersion.
  • Another purpose of the present invention is to provide a regenerator with high efficiency, high reliability, and that is easy to produce at competitive costs.
  • a regenerator for recovering the heat of fumes of a domestic or industrial boiler comprising a containment structure, within which a plurality of heat-exchange elements are located, each provided with at least one through cavity.
  • the regenerator is characterized in that it comprises a delivery channel designed to convey the fumes within the through cavities of the heat-exchange elements and such as to be operatively connectable to a duct for the extraction of the fumes from the combustion cell of a boiler.
  • the containment structure comprises a first opening and a second opening, respectively for delivery and evacuation of water that is to supply the boiler. Said openings have the purpose of providing together a bath of running water around the heat-exchange elements.
  • the regenerator 1 comprises a plurality of heat-exchange elements 5A, 5B located within a containment structure 10. Each of these elements defines a through cavity 8 in the direction in which the element 8 itself develops.
  • the regenerator 1 is characterized in that it comprises a delivery channel 81 for conveying the fumes generated in a combustion cell 4 of a boiler 2 within the through cavity 8 of the heat-exchange elements 5.
  • the delivery channel 81 is operatively connectable to a duct 70, designed to enable extraction of said fumes from the combustion cell 4.
  • the containment structure 10 of the regenerator 1 is provided with a first opening 17 and a second opening 18, respectively for delivery and evacuation of water, that is to be heated by the boiler 2.
  • the two openings 17 and 18 have the purpose of providing together a bath of running water around the heat-exchange elements 5A, 5B.
  • This enables considerable limitation of the thermal dispersion by irradiation through the jacket 22 of the containment structure 10 in so far as the fluid that laps said surface is at a lower temperature than what is envisaged in known regenerators.
  • the low thermal dispersion enables setting of the regenerator 1 on the outside of the fluid-tight chamber 3 of the boiler 2 according to modalities described in greater detail hereinafter.
  • FIG 1 illustrates a possible embodiment of the heat exchanger according to the present invention.
  • the containment structure 10 is defined by a jacket 22 with longitudinal development and by a pair of flanges 25 provided at the opposite ends of the jacket 22.
  • the two flanges 25 have the purpose of positioning the heat-exchange elements 5 within the containment structure 10.
  • Figure 2 is a cross-sectional view of the regenerator of Figure 1 according to a plane of longitudinal cross section which shows a preferred embodiment of the invention, according to which the delivery channel 81 is operatively connected to a first series 5A of heat-exchange elements in a position corresponding to a first flange 25A of said plurality of flanges 25.
  • a second series of heat-exchange elements 5B is operatively connected to said first series of heat-exchange elements 5A in a position corresponding to a second 25B of said plurality of flanges 25.
  • the two series of heat-exchange elements 5A, 5B are preferably arranged in a common direction, in which also the jacket 22 of the containment structure 10 develops.
  • connection between the two series of heat-exchange elements 5A, 5B is preferably made through a chamber for return of the fumes 33, provided in a position corresponding to said second flange 25B and hermetically insulated from the bath of running water.
  • the technical solution just described basically defines a pre-set path for the fumes within the containment structure 10 that enables a reduction, given the same surface of heat exchange, of the overall dimensions of the regenerator 1.
  • the first, delivery, opening 17 is defined on one side of the second flange 25B, whilst the second, evacuation, opening 18 is instead defined on one side of the first flange 25A for generating a bath of running water such as to lap the heat-exchange elements 5A, 5B throughout their length.
  • the function of the two openings 17 and 18 can be reversed, for example in the case where the regenerator 1 is installed in a position turned upside down with respect to the one illustrated in Figure 1.
  • Figure 3 is a cross-sectional view of the regenerator 1 of Figure 1 according to a transverse plane that in particular shows a possible embodiment of the heat-exchange elements 5A, 5B.
  • they are constituted by tubes made of metal material or metal alloys with high thermal conduction, such as for example aluminium alloys. Said tubes are preferably defined by corrugated surfaces for increasing the useful surface of heat exchange between the two fluids.
  • FIG 4 is an exploded view of the regenerator 1 according to the invention that shows in detail the elements constituting said regenerator.
  • the regenerator 1 comprises an evacuation channel 82, which has the function of conveying the fumes towards a flue 97 (see Figure 6) when these exit from the cavities 8 of the heat-exchange elements 5A, 5B.
  • the evacuation channel 82 is provided in a position corresponding to the first flange 25A in order to collect and convey the fumes that exit from the second series of heat-exchange elements 5B.
  • This can be made of a single piece that can be operatively connected to the first flange 25A, but can also be made of a number of sectional parts that can be assembled together, as illustrated precisely in Figure 4.
  • the shape of the evacuation channel 82 can obviously differ from the one illustrated, as its orientation can vary according to the different requirements of use.
  • the regenerator 1 is provided with first sealing means 61 pre-arranged for providing the mechanical tightness between the first flange 25A and the duct for delivery 81 and duct for evacuation 82 of the fumes.
  • Second sealing means 62 are instead pre-arranged for providing the mechanical tightness between the return chamber 33 and the second flange 25B of the regenerator 1.
  • FIGS 5, 6 and 7 are perspective views of a boiler 2, characterized in that it comprises a regenerator 1 according to the present invention.
  • the boiler 2 has a substantially prismatic structure with a vertical development, i.e., defined by four side walls, of which at least one provided with means 99 for control of operation of the boiler itself by a user.
  • the boiler 2 comprises an outer casing 12, provided inside which is a fluid-tight chamber 3 in turn containing a combustion cell 4.
  • a heat exchanger 55 referred to as "primary heat exchanger" is present inside the combustion cell 4 for the purpose of heating, with the products of combustion, the water for the water-using devices.
  • the regenerator 1 is advantageously located on the outside of the fluid-tight chamber 3 and operatively connected to the combustion cell 4 through a pipe 70 for extraction of the fumes.
  • the containment structure 10 of the regenerator 1 is operatively connected, in a position corresponding to the second opening 18, to the primary heat exchanger 55 through a supply pipe 92, whilst the first delivery opening 17 is hydraulically connected to a water-distribution network, such as may be, for instance, the domestic network.
  • regenerator 1 On the outside of the fluid-tight chamber 3 is possible by virtue of the low thermal dispersion that accompanies operation of the regenerator itself.
  • the bath of water present in the containment structure 10 of the regenerator 1 limits in fact heating of the jacket 22 and hence the thermal dispersion through the latter.
  • Figures 8 and 9 are respectively a cross-sectional view and a side view of the boiler 2 that show in detail the arrangement of the regenerator 1 with respect to the fluid-tight chamber 3.
  • the longitudinal development of the regenerator 1 enables positioning thereof along a wall of the fluid-tight chamber 3 so as to contain as much as possible also the space occupied by the outer casing 12 of the boiler 2.
  • the containment casing 12 can be advantageously provided in a first portion 12A that surrounds at least partially three sides of the fluid-tight chamber 3 and a second portion 12B that surrounds the regenerator 1 present up against a fourth side of the fluid-tight chamber 3.
  • said solution facilitates the operations of maintenance of the boiler 2 and in particular those of the regenerator 1.
  • the maintenance of the latter does not require the operator to gain access to the fluid-tight chamber 3, but simply requires removal of the second portion 12B of the casing 12.
  • the present invention provides also a new method for preheating the water that is to supply the primary heat exchanger of a boiler.
  • the method in particular comprises the steps of:
  • the method just referred to hence differs from the ones traditionally used for the same purpose in so far as it provides a preheating of the water on the outside of the fluid-tight chamber 3 of the boiler 2 with the advantages already set forth above.
  • the method according to the invention then comprises also the creation of a pre-set path for said fumes within the elements 5A, 5B for the purpose of prolonging the duration of the heat exchange.
  • Said path is obtained by connecting mutually the elements 5A, 5B preferably in such a way that the heat exchange between the fumes and the bath of running water occurs in part in conditions of equicurrent and in part in conditions of countercurrent.
  • the regenerator 1 is distinguished by a high efficiency accompanied by a low thermal dispersion. Said characteristic enables the installation thereof on the outside of the boiler designed to be interlocked to the regenerator itself.
  • the materials used, as well as the dimensions and the shapes involved, may be any whatsoever according to the requirements and the state of the art.

Landscapes

  • 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)
EP20070102665 2006-02-28 2007-02-19 Régénérateur pour chauffe-eau et chauffe-eau doté dudit générateur Withdrawn EP1906085A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBG20060011 ITBG20060011A1 (it) 2006-02-28 2006-02-28 Recuperatore di calore per caldaie e caldaia comprendente tale recuperatore.

Publications (1)

Publication Number Publication Date
EP1906085A2 true EP1906085A2 (fr) 2008-04-02

Family

ID=39126551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070102665 Withdrawn EP1906085A2 (fr) 2006-02-28 2007-02-19 Régénérateur pour chauffe-eau et chauffe-eau doté dudit générateur

Country Status (2)

Country Link
EP (1) EP1906085A2 (fr)
IT (1) ITBG20060011A1 (fr)

Also Published As

Publication number Publication date
ITBG20060011A1 (it) 2007-09-01

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