EP2245370B1 - Dispositif d'entrée pour flux d'air ou de gaz dans une unité ventilateur, en particulier dans des brûleurs à gaz à prémélange - Google Patents

Dispositif d'entrée pour flux d'air ou de gaz dans une unité ventilateur, en particulier dans des brûleurs à gaz à prémélange Download PDF

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Publication number
EP2245370B1
EP2245370B1 EP08869957.4A EP08869957A EP2245370B1 EP 2245370 B1 EP2245370 B1 EP 2245370B1 EP 08869957 A EP08869957 A EP 08869957A EP 2245370 B1 EP2245370 B1 EP 2245370B1
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EP
European Patent Office
Prior art keywords
flow
fan
duct
gas
air
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Application number
EP08869957.4A
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German (de)
English (en)
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EP2245370A2 (fr
Inventor
Antonio Ranalli
Rosalino Usci
Michele Marcantoni
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Sit SpA
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Sit SpA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit

Definitions

  • the present invention concerns an inlet device for an air/gas flow in a fan unit, particularly for pre-mixed gas burners, having the characteristics mentioned in the preamble of claim 1.
  • Devices of the aforesaid type are used particularly, although not exclusively, in gas burner apparatuses with pre-mixing, in which a combustible air/gas mixture is pre-mixed upstream of the combustion head of the burner.
  • An inlet device for an air/gas flow having the features outlined above is known from EP 896191 A2 .
  • Typical applications provide for the use of Venturi-effect mixers, in which the combustible gas is injected into the restriction section of a Venturi tube arranged for conveying to the burner the predetermined flow of air for combustion.
  • the combustible gas is typically fed to an inlet device, and in particular in proximity to an axial zone of the device, with reference to the axis of the impeller of a centrifugal fan associated with the inlet device.
  • the device provided in general with stator blades intended to impart a rotational component to the pre-mixed flow, is fed with a flow of air which is then mixed, in the device, with the gas injected axially, to form a combustible mixture to be conveyed to the intake section of the fan.
  • the principal aim of the invention is that of providing an inlet device for an air/gas flow which is structurally and functionally designed to improve the capacity thereof for mixing the flows of air and gas introduced and also to facilitate the conveyance thereof to an intake section of a fan unit associated with the device.
  • the reference 1 indicates as a whole an inlet device for an air/gas flow in a fan unit (shown only diagrammatically), produced according to the present invention.
  • the device 1 is designed to admit the flows of air and combustible gas into a mixing zone so as to form a pre-mixed flow of a combustible air/gas mixture intended to be fed to the intake section of a centrifugal fan 2, which is arranged to supply, at its delivery side, the combustible mixture to a combustion head 3 of a gas burner 4.
  • Figure 3 shows diagrammatically a preferred configuration in which the device 1, the fan 2 and the burner 3 are diagrammatically shown associated with one another, one after the other, in an axial direction X.
  • the axis X moreover forms the axis of rotation of the impeller 2a of the fan, which is housed in a manifold 5 provided with an axial intake section 5a and a delivery section 5b which is located in a position remote from the axis, at the outside diameter of the impeller.
  • the device 1 comprises conveying means for conveying the fluid introduced into it, indicated as a whole by 6, which are of the centripetal type, i.e. are designed to convey the flow, admitted in a position remote from the axis X, in the direction of the axis itself, in a substantially centripetal movement, as will become clear from the following detailed description.
  • the conveying means 6 comprise a plurality of stator conveying ducts, all indicated by 7, which extend in directions having a predominant radial component, with respect to the axis of rotation X, and are angularly spaced from one another along a circumferential profile concentric with the axis X, as is clearly illustrated in Figure 1 .
  • the ducts 7 are conveniently formed on a discoid base 8 having its main axis coaxial with the axis X, and from which rise in the same direction a plurality of walls 9, each pair of walls adjacent to each other defining a respective duct 7.
  • Each of said ducts 7 is therefore delimited by a pair of opposed and facing walls 9, by the base 8 and, on the opposite side from the base, by at least part of the manifold 5.
  • each duct 7 is open at its opposed longitudinal ends, at which are respectively formed an opening 7a, remote from the axis X, constituting an opening for the entry of the flow into the device, and an opening 7b, close to the axis X, constituting an opening for the exit of the flow from the corresponding duct 7.
  • the openings 7a are therefore distributed along a common circumferential profile, in a position remote from the main axis X, and are conveniently angularly spaced at a regular pitch.
  • the openings 7b are also distributed at an equal angular pitch on a second profile, close to the axis X and concentric therewith.
  • the passage cross-section of the flow in each conveying duct 7 has an amplitude which increases from the corresponding opening 7a in the direction of the opposed outlet opening 7b.
  • the walls 9 delimiting the plurality of ducts conveniently have a curved profile in the longitudinal direction predominantly directed radially, as is clearly illustrated in Figure 2 .
  • the curved profiles of the entire plurality of walls are moreover provided in a configuration in which they have a curvature of the same sign.
  • the reference 10 also defines a zone formed in the device, downstream of the ducts 7 and contained between the outlet openings 7b and the main axis X of the device, in which zone takes place the mixing of the flows conveyed, in a centripetal movement, along the ducts 7 and delivered at the outlet of the ducts.
  • the mixing zone 10 provided at least in part in the base 8 of the device, is arranged to be placed in fluid communication with the axial intake section 5a of the centrifugal fan 2, such that the fan is fed at the intake side with the pre-mixed air/gas flow.
  • the device in functional terms, forms a kind of bladed stator placed at the intake side of the fan, in which the air/gas pre-mixing takes place downstream of the conveyance, with a centripetal motion, of the flows of air and gas admitted into the device.
  • Such a configuration offers advantages compared with the known solutions, in which the injection of the gas takes place centrally and in an axial direction in proximity to the main axis.
  • One advantage for example, is that of being able to manage the injection of the gas more easily and simply, since it is located in a position remote from the axis. This is reflected for example in the possibility of being able to position more easily and simply the valve unit intended to deliver the combustible gas to the mixing zone.
  • Another advantage is that of being able to take advantage, in the centripetal radial movement, of the curvature of the ducts in order to impart a rotational component to the flow introduced into the device, this being advantageously made possible by the centripetal movement conveying the flow which characterizes the device according to the invention.
  • a further advantage is that of the rates of motion which are more similar to those of the gas nozzle: this is an advantage in the regularity of delivery of the gas in the case of a pneumatically-controlled valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (6)

  1. Dispositif d'entrée pour un flux air-gaz, en particulier pour l'admission dudit flux dans un ventilateur centrifuge (2) d'un appareil brûleur de prémélange, comprenant des moyens de transport de flux (6) agencés pour le transport du flux d'air et/ou de gaz à la section d'entrée (5a) du ventilateur, lesdits moyens de transport (6) étant du type à flux centripète et comprenant une pluralité de conduits de transport de stator (7) s'étendant dans des directions présentant une composante radiale prédominante par rapport à l'axe de rotation (X) du ventilateur (2) et étant espacés angulairement les uns des autres le long d'un profil circonférentiel concentrique avec ledit axe, dans lequel chaque conduit (7) de ladite pluralité est délimité au moins par une paire de parois en regard (9) se faisant face l'une l'autre et s'élevant dans la même direction à partir d'une base discoïde (8) dudit dispositif agencé pour le montage coaxial avec le ventilateur (2), le conduit (7) étant capable d'être délimité, sur le côté en regard depuis la base, par au moins une partie du collecteur (5) pour le logement du rotor, chaque conduit (7) étant ouvert sur les extrémités en regard de sa longueur, avec une première ouverture (7a) pour l'entrée du flux au niveau d'une des extrémités, dans une position à distance de l'axe principal de la base, et avec une seconde ouverture (7b) pour la sortie du flux au niveau de l'autre extrémité, positionnée à proximité dudit axe (X), caractérisé en ce que la section transversale de passage pour le flux dans chaque conduit de transport (7) présente une amplitude augmentant depuis l'ouverture d'entrée (7a) dans la direction de l'ouverture de sortie (7b) pour le flux.
  2. Dispositif selon la revendication 1, dans lequel chaque paire de parois en regard (9) de ladite base (8) délimitant un conduit respectif (7) présente un profil courbé dans la direction longitudinale et aussi radiale par rapport à l'axe principal (X) de ladite base (8).
  3. Dispositif selon la revendication 2, dans lequel les profils courbés de chaque paire de parois (9) se faisant face l'une l'autre et délimitant un conduit correspondant (7) présentent une courbure de même signe.
  4. Dispositif selon l'une quelconque des revendications précédentes, dans lequel en aval de chaque conduit (7), par rapport à la direction centripète du flux, entre l'ouverture de sortie (7b) du conduit (7) et l'axe principal du dispositif, une zone de mélange (10) est définie pour les flux transportés par lesdits conduits (7) à la section d'entrée (5a) du ventilateur (2).
  5. Dispositif selon la revendication 4, dans lequel ladite zone de mélange (10) est agencée pour être placée en communication fluidique avec une section d'entrée axiale (5a) d'un ventilateur centrifuge (2), le rotor étant coaxial audit dispositif, de sorte que le ventilateur soit alimenté sur le côté d'entrée en flux air-gaz mélangé venant de la zone de mélange (10).
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel un ou plusieurs desdits conduits de transport (7) sont destinés à l'admission d'un gaz combustible à transporter vers la zone de mélange (10), le reste des conduits (7) de ladite pluralité étant destiné à transporter de l'air à la zone de mélange (10), de sorte que dans ladite zone, le prémélange air-gaz se réalise pour alimenter la section d'entrée (5a) d'un ventilateur agencé pour amener sur le côté de fourniture un flux de mélange de combustible à un appareil brûleur.
EP08869957.4A 2008-01-08 2008-12-18 Dispositif d'entrée pour flux d'air ou de gaz dans une unité ventilateur, en particulier dans des brûleurs à gaz à prémélange Active EP2245370B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD20080006 ITPD20080006A1 (it) 2008-01-08 2008-01-08 Dispositivo di immissione di un flusso aria/gas in un gruppo ventilatore, particolarmente per bruciatori a gas con pre-miscelazione.
PCT/EP2008/067924 WO2009087041A2 (fr) 2008-01-08 2008-12-18 Dispositif d'entrée pour flux d'air ou de gaz dans une unité ventilateur, en particulier dans des brûleurs à gaz à prémélange

Publications (2)

Publication Number Publication Date
EP2245370A2 EP2245370A2 (fr) 2010-11-03
EP2245370B1 true EP2245370B1 (fr) 2017-04-26

Family

ID=40290216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08869957.4A Active EP2245370B1 (fr) 2008-01-08 2008-12-18 Dispositif d'entrée pour flux d'air ou de gaz dans une unité ventilateur, en particulier dans des brûleurs à gaz à prémélange

Country Status (3)

Country Link
EP (1) EP2245370B1 (fr)
IT (1) ITPD20080006A1 (fr)
WO (1) WO2009087041A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1391676B1 (it) * 2008-11-07 2012-01-17 Sit La Precisa Spa Con Socio Unico Apparecchio bruciatore a gas con pre-miscelazione
RS59606B1 (sr) * 2014-02-12 2020-01-31 C I B Unigas S P A Uređaj za upravljanje sagorevanjem u gorioniku

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19733769C2 (de) * 1997-08-05 2003-05-22 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
IT1315743B1 (it) * 2000-10-03 2003-03-18 Sit La Precisa Spa Dispositivo miscelatore aria-gas perfezionato.
ITPD20010023A1 (it) * 2001-02-01 2002-08-01 Sit La Precisa Spa Dispositivo miscelatore aria-gas perfezionato.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2009087041A3 (fr) 2009-09-17
WO2009087041A2 (fr) 2009-07-16
EP2245370A2 (fr) 2010-11-03
ITPD20080006A1 (it) 2009-07-09

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