EP2242953B1 - Dispositif de mélange d'air et de gaz, destiné en particulier à des appareils brûleurs à prémélange - Google Patents

Dispositif de mélange d'air et de gaz, destiné en particulier à des appareils brûleurs à prémélange Download PDF

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Publication number
EP2242953B1
EP2242953B1 EP08869932.7A EP08869932A EP2242953B1 EP 2242953 B1 EP2242953 B1 EP 2242953B1 EP 08869932 A EP08869932 A EP 08869932A EP 2242953 B1 EP2242953 B1 EP 2242953B1
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EP
European Patent Office
Prior art keywords
duct
gas
flow
mixing
air
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Application number
EP08869932.7A
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German (de)
English (en)
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EP2242953A2 (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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F04D17/025—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal comprising axial flow and radial flow stages
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14021—Premixing burners with swirling or vortices creating means for fuel or air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14701—Swirling means inside the mixing tube or chamber to improve premixing

Definitions

  • the present invention relates to an air/gas mixing device, in particular for burner apparatuses with pre-mixing, having the characteristics mentioned in the preamble of principal claim No. 1.
  • Devices of the aforesaid type are used particularly 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.
  • Typical applications provide for the use of Venturi-effect mixers, in which the combustible gas is injected into the restricted section of a Venturi tube arranged for conveying to the burner the predetermined flow of air for combustion.
  • a burner with a air/gas pre-mixing unit upstream of a fan is described by EP896191 .
  • the principal aim of the invention is that of providing an air-gas mixing device structurally and functionally designed to improve the capacity thereof and the efficiency of mixing of 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 air/gas mixing device, particularly designed for gaseous fuel burners with pre-mixing, and produced according to the invention.
  • the device is arranged to receive the flows of air and gas admitted into the device, and to mix the flows so as to form a combustible air/gas mixture intended to be fed to the intake section of a centrifugal fan 2, which is itself arranged to supply, at the delivery side, the combustible mixture to a combustion head 3 of a gas burner 4.
  • Figure 4 shows only diagrammatically a preferred configuration in which the mixing device, the fan and the burner are operationally associated with one another and also disposed, one after the other, in an axial direction X.
  • the axis X further forms the axis of rotation of the impeller 2a of the fan 2, which is housed in a manifold 5 provided with an axial intake section 5a and with a delivery section 5b, disposed in a position remote from the axis X, at the outside diameter of the impeller.
  • the device 1 comprises first conveying means for conveying the flow introduced into it, which are indicated as a whole by 6, and 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 said axis 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 Figures 1 and 2 .
  • 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. In this way, each corresponding duct 7 has a characteristic divergent configuration, in the direction of the flow conveyed.
  • the walls 9 delimiting the plurality of ducts 7 conveniently have a curved profile in the longitudinal direction predominantly radially directed, as is clearly illustrated in Figure 2 .
  • the curved profiles of the entire plurality of walls 9 are moreover provided with 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 individual flows conveyed, in a centripetal movement, along the ducts 7 and delivered at the outlet of said ducts.
  • the mixing device 1 also comprises second conveying means, designed for conveying the flow of combustible gas, admitted into the device, into each individual duct 7 of the first conveying means, such that in each duct 7 air/gas pre-mixing takes place downstream of the inlet zone for the gas in the corresponding duct 7, in the direction of the axis X.
  • Said second conveying means comprise a distributing channel 11 extending along a circular profile, concentric with the axis X, contiguous with the ducts 7 and also provided with a plurality of through openings 12, each of which places the channel in fluid communication with a respective duct 7.
  • the openings 12 are disposed, angularly spaced at a regular pitch, along the circular profile of the length of the channel 11.
  • the channel 11 preferably has a toroidal configuration, a partial middle section of which is shown in Figures 1 and 2 .
  • the channel 11 is interrupted circumferentially at a preselected duct 7 (indicated by 7' in the drawings), the latter being intended for the admission of the combustible gas into the device.
  • the duct 7' therefore (via the corresponding opening 7a) places the outside of the mixer in fluid communication with the channel 11, via the passage 11a delimited by the aforesaid circumferential interruption.
  • Each opening 12 is further positioned at a respective portion of each duct 7, contained between the respective ends 7a, 7b, and conveniently behind the end opening 7a, such that the air/gas mixing, between the flow of air, conveyed along a duct 7, and the flow of combustible gas, fed via the channel 11 into the corresponding opening 12, takes place in a section of the duct 7 from which a divergent portion of the duct itself extends in the direction of the main axis.
  • This configuration, provided in each of the ducts 7, substantially reflects the mixing process obtained with a Venturi effect from the restricted section of a divergent duct. Such mixing is however effected in each of the ducts 7, for each respective individual flow of air admitted by the corresponding duct 7, and mixed with the gas distributed by means of the channel 12.
  • the ducts 7, with the exception of the duct 7', are dedicated to conveying air inside the mixer, and the air/gas pre-mixing takes place in each duct 7 in the manner described above, to form a combustible mixture to be fed to the fan 2 and thence to the burner 4.
  • 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 on the intake side with the pre-mixed air/gas flow.
  • the mixing device of the invention in functional terms, forms a system equivalent to a plurality of Venturi tubes in parallel with one another, where each individual mixing takes place in the corresponding duct of the plurality of ducts provided in the mixer.
  • This plurality of individual mixing systems advantageously permits more efficient management of the mixing, inasmuch as it ensures in the individual duct greater efficiency and uniformity of the flow rates of the air/gas mixture.
  • the plurality of mixing venturis ensures uniform distribution of the air/gas mixture already before the impeller.
  • Another advantage is the possibility of increasing the return under-pressure of the combustible gas, necessary in air/gas systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Gas Burners (AREA)

Claims (7)

  1. Dispositif de mélange air/gaz, en particulier pour des appareils de brûleur à pré-mélange, comprenant :
    - un premier moyen de transport (6) avec un flux centripète comportant une pluralité de conduites (7) ayant une direction radiale prédominante et disposées le long d'un profil circonférentiel concentrique avec un axe principal (X) et ayant une configuration divergente dans la direction du flux transporté, le flux d'air, destiné à être mélangé avec le gaz, étant destiné à être admis dans lesdites conduites (7),
    - un second moyen de transport de gaz (11) pour transporter le gaz, admis dans le dispositif, dans chaque conduite (7) du premier moyen de transport (6), de sorte que dans chaque conduite, un pré-mélange air/gaz ait lieu en aval de la zone pour l'admission du gaz dans la conduite, dans la direction dudit axe (X), ledit second moyen de transport comprenant un canal de distribution de gaz (11) s'étendant le long d'un profil circulaire concentrique avec ledit axe principal (X) et également pourvu d'une pluralité d'ouvertures traversantes (12) respectives, dont chacune place le canal (11) en communication avec une conduite (7) respective du premier moyen de transport (6),
    chaque conduite (7) de ladite pluralité étant délimitée au moins par une paire de parois opposées (9) en regard l'une de l'autre et s'élevant dans la même direction depuis une base discoïde (8) dudit dispositif, agencée pour un montage coaxial avec un ventilateur, la conduite (7) étant capable d'être délimitée, sur le côté opposé de la base, par au moins une partie d'un collecteur (5) pour loger la turbine du ventilateur, chaque conduite (7) étant ouverte au niveau des extrémités opposées de sa longueur, avec une première ouverture (7a) pour l'entrée du flux au niveau de l'une des extrémités, dans une position éloignée de l'axe principal de la base (8), et avec une seconde ouverture (7b) pour la sortie du flux au niveau de l'autre extrémité, positionnée à proximité dudit axe (X),
    dans lequel l'ouverture correspondante (12) pour une communication du canal (11) avec la conduite (7) correspondante est disposée dans une position entre lesdites extrémités, et dans lequel
    la section transversale de passage pour le flux dans chaque conduite de transport (7) a une amplitude croissante depuis l'ouverture d'entrée (7a) dans la direction de l'ouverture de sortie (7b) pour le flux, de sorte que le mélange air/gaz, entre le flux d'air, transporté le long de chaque conduite (7), et le flux de gaz combustible, fourni via ledit canal (11) dans l'ouverture (12) correspondante, ait lieu dans une section de la conduite (7) depuis laquelle une portion divergente de la conduite elle-même s'étend dans la direction de l'axe principal (X).
  2. Dispositif de mélange selon la revendication 1, dans lequel ledit canal (11) a une configuration sensiblement toroïdale.
  3. Dispositif de mélange selon la revendication 1 ou 2, dans lequel ledit canal (11) est pourvu d'une ouverture (11a) pour l'admission du gaz dans le canal (11), et qui place le canal en communication fluidique avec au moins l'une (7') des conduites dudit premier moyen de transport (6) le long desquelles le flux de gaz est admis dans le dispositif de mélange.
  4. Dispositif selon l'une quelconque des revendications précédentes, dans lequel chaque paire de parois opposées (9) de ladite base (8) délimitant une conduite (7) respective a un profil incurvé dans la direction longitudinale et également radiale par rapport à l'axe principal (X) de ladite base (8).
  5. Dispositif selon la revendication 4, dans lequel les profils incurvés de chaque paire de parois (9) en regard l'une de l'autre et délimitant une conduite (7) correspondante ont une courbure du même signe.
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel en aval de chaque conduite (7), par rapport à la direction centripète du flux, entre l'ouverture de refoulement (7b) de la conduite (7) et l'axe principal (X) du dispositif, une seconde zone est définie pour le mélange des flux individuels de mélange air/gaz transporté par les conduites (7) respectives vers la section d'admission du ventilateur.
  7. Dispositif selon la revendication 6, dans lequel ladite seconde zone de mélange est appropriée pour être placée en communication fluidique avec une section d'admission axiale d'un ventilateur centrifuge avec turbine coaxiale avec ledit dispositif, de sorte que le ventilateur soit alimenté au niveau du côté d'admission avec le flux air/gaz mélangé provenant de ladite zone de mélange.
EP08869932.7A 2008-01-08 2008-12-19 Dispositif de mélange d'air et de gaz, destiné en particulier à des appareils brûleurs à prémélange Active EP2242953B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD20080005 ITPD20080005A1 (it) 2008-01-08 2008-01-08 Dispositivo miscelatore aria-gas, particolarmente per apparecchi bruciatori a pre-miscelazione.
PCT/EP2008/068041 WO2009087050A2 (fr) 2008-01-08 2008-12-19 Dispositif de mélange d'air et de gaz, destiné en particulier à des appareils brûleurs à prémélange

Publications (2)

Publication Number Publication Date
EP2242953A2 EP2242953A2 (fr) 2010-10-27
EP2242953B1 true EP2242953B1 (fr) 2017-10-18

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Application Number Title Priority Date Filing Date
EP08869932.7A Active EP2242953B1 (fr) 2008-01-08 2008-12-19 Dispositif de mélange d'air et de gaz, destiné en particulier à des appareils brûleurs à prémélange

Country Status (3)

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EP (1) EP2242953B1 (fr)
IT (1) ITPD20080005A1 (fr)
WO (1) WO2009087050A2 (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
IT202100025352A1 (it) * 2021-10-04 2023-04-04 Raffaele Antonio Spezia Applicazioni di un elemento a micro ugelli

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905375A (en) * 1958-01-14 1959-09-22 Hanus John Air mixing and flow control device
DE19733769C2 (de) * 1997-08-05 2003-05-22 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
US5983642A (en) * 1997-10-13 1999-11-16 Siemens Westinghouse Power Corporation Combustor with two stage primary fuel tube with concentric members and flow regulating
EP1096201A1 (fr) * 1999-10-29 2001-05-02 Siemens Aktiengesellschaft Brûleur
US7093445B2 (en) * 2002-05-31 2006-08-22 Catalytica Energy Systems, Inc. Fuel-air premixing system for a catalytic combustor
DE60228085D1 (de) * 2002-09-20 2008-09-18 Siemens Ag Vormischbrenner mit profilierter Luftmassenströmung
GB0230070D0 (en) * 2002-12-23 2003-01-29 Bowman Power Systems Ltd A combustion device

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP2242953A2 (fr) 2010-10-27
WO2009087050A3 (fr) 2010-05-20
WO2009087050A2 (fr) 2009-07-16
ITPD20080005A1 (it) 2009-07-09

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