EP0596555B1 - A gas burning apparatus with an atmospheric burner - Google Patents

A gas burning apparatus with an atmospheric burner Download PDF

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Publication number
EP0596555B1
EP0596555B1 EP93202975A EP93202975A EP0596555B1 EP 0596555 B1 EP0596555 B1 EP 0596555B1 EP 93202975 A EP93202975 A EP 93202975A EP 93202975 A EP93202975 A EP 93202975A EP 0596555 B1 EP0596555 B1 EP 0596555B1
Authority
EP
European Patent Office
Prior art keywords
nozzles
primary air
gas
combustion chamber
conduits
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.)
Expired - Lifetime
Application number
EP93202975A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0596555A1 (en
Inventor
Enrico Sebastiani
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.)
Beckett Thermal Solutions SRL
Original Assignee
Worgas Bruciatori 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 Worgas Bruciatori SRL filed Critical Worgas Bruciatori SRL
Publication of EP0596555A1 publication Critical patent/EP0596555A1/en
Application granted granted Critical
Publication of EP0596555B1 publication Critical patent/EP0596555B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement

Definitions

  • This invention relates to gaseous fuel burning apparatus, and in particular, it concerns a gas burning apparatus as defined in the preamble of claim 1.
  • a typical application of gaseous fuel burning apparatus employing an atmospheric burner is that of small- and medium-size boilers intended for use in dwelling space heating systems and systems for heating sanitary water.
  • a boiler of that kind consists basically of an atmospheric burner, that is one operating on a Bunsen's burner principle, a combustion chamber, a heat exchanger, and a fan or any other structures effective to create a vacuum within the combustion chamber. Combustion air is admitted through openings provided in the apparatus, usually in the area where the burner is located.
  • a suitable burner for such applications is described, for example, in Italian Patent Application No. 40099-A/90 filed by Worgas Bruciatori s.r.l. on July 6, 1990 and prosecuted as a PCT application published on January 23, 1993 as WO92/01196.
  • the combustion air is drawn into the burner and admixed to the gas being ejected at a high speed through specially provided delivery nozzles.
  • the resultant gas/primary air mixture wherein the air percentage may vary between 60% and more than 100% of the stoichiometric amount required for combustion, according to the gas type and the design features of the burner, is conveyed from the intake and mixing conduits, through appropriate fittings, to respective diffusers which extend along the remote side of the combustion chamber from the heat exchanger and are provided with openings wherethrough the mixture to be burned flows out.
  • the remainder of the air required for complete combustion is drawn toward the combustion chamber separately from the primary air.
  • the apparatus depicted in Figure 1 comprises an atmospheric burner 10, a combustion chamber 11, a heat exchanger 12, and a fan 13, all accommodated inside a compartment 14 having a vertical spread, in this case.
  • the burner comprises, as shown best in Figure 2, a conduit 15 having a square cross-sectional shape and being shown with a portion thereof removed, which conduit is connected to a gas distribution system through a fitting 16 and carries multiple nozzles 17 which extend parallel to one another from the conduit.
  • a metal conduit 18, in the form of a venturi which is disposed with its inlet port at a predetermined distance away from the nozzle, and in this case coaxial with the nozzle, for drawing in primary air and admixing it to the gas flowing out of the nozzle.
  • Each venturi 18 conveys, through a connection channel 18', the gas/primary air mixture into a box-type diffuser member 19 which has multiple holes across one of its narrow sides.
  • venturis and the openings 25, and more generally, all the physical and construction parameters of the apparatus so embodied are selected such that the primary air is admixed to the gas in varying proportions, depending on individual requirements and/or the power delivered, from substantially equal values to the amount stoichiometrically necessary for gas combustion up to values which exceed this amount by 50-60%.
  • venturis 18, their respective connection channels 18', and the diffusers 19 are, as can be seen, arranged in structurally similar sets placed side-by-side a given distance apart and with the holed sides of the diffusers 19 in the same plane to form a horizontal bed whence the flame will issue.
  • a wall of sheet metal is provided between the nozzles and the venturis crosswise to the axes of the latter and has a circular opening at the location of each of the nozzles.
  • the gas flows at a high speed out of the nozzles and causes air, the primary air, to be drawn into the venturis to become mixed with it; the mixture is then delivered, through the diffuser holes, into the combustion chamber where it is burned.
  • the air required to complete the combustion i.e. the secondary air, is drawn in from the lower portion of the apparatus which is in open communication with the outside, by the vacuum created by the fan and is introduced into the combustion chamber through the gaps between adjacent sets, including the venturis, connection channels, and diffusers.
  • the secondary air supply is controlled such that it will be drawn into the combustion chamber 11 only through openings provided to this purpose in the neighborhood of the inlet ports of the intake conduits 18.
  • the lower portion of the burner 10 is contained within a box-type structure 23, shown with a portion thereof removed in Figure 2, which has its sides joined to the walls of the combustion chamber 11 and includes a wall 24 which, additionally to having primary air openings, shown at 25, similarly to the above-described prior art apparatus, has more openings 26 adjacent to them.
  • Such additional openings 26 locate outside the areas facing the inlet ports of the venturis 18 but in all cases near the areas where the entraining effect on the gas streams issuing from the nozzles 17 and attendant intake of air to the venturis are manifest.
  • the secondary air can only be drawn into the combustion chamber through such additional openings.
  • each of the side-by-side sets which jointly form the burner comprises two venturis, being laid at about 90° to each other, as indicated at 18a and 18b, and communicated to a common diffuser 19'.
  • a gas intake conduit 15' having here a substantially triangular cross-sectional shape, has two sets of nozzles 17a, 17b confronting the intake ports of venturis.
  • the nozzles are mounted with their axes slightly offset downwards parallel to the axes of their respective venturis, but may be mounted with their axes at a slope angle on the venturi axes.
  • the construction details and advantages of this type of mount are described in Italian Patent Application No. 19294-A/87 filed by Worgas Bruciatori s.r.l..
  • a box-type structure 23' encloses all the side-by-side sets of the burner and is mounted with its sides joined to the side walls of the combustion chamber 11.
  • This structure is configured to have a wall, bent to an angle, interposed to the intake ports of the venturis 18a, 18b and its respective nozzles 17a, 17b.
  • the two portions, denoted by 24a and 24b, of that wall have primary air openings 25a, 25b facing the inlet ports of the venturis 18a and 18b and secondary air openings 26a and 26b proximate to the openings for the primary air, similar to what has been described in connection with the apparatus of Figures 1 and 2.
  • the streams of primary air APa, APb and secondary air ASa, ASb being flowed through the openings in the portions 24a and 24b, respectively, of the angled wall are parallel to each other, of course.
  • the expedient of this invention besides being extremely simple construction-wise, has proved highly advantageous in that it affords a homogeneous combustion even where the burner is operated at the lowest power.
  • the additional openings 26 would obviously have to be sized such that the flow rate of secondary air is adequate to ensure full combustion of the gas under all conditions.
  • This sizing should take account of the vacuum present within the combustion chamber.
  • the secondary air flow rate can be readily controlled by suitably adjusting the dimensions of the openings 26.
  • predetermined relatively low vacuum levels such as can be obtained using a flue
  • the additional openings provided in the wall formed with the primary air openings may not be sufficient for the secondary air to attain the required flow rate. In this case, further openings may obviously be provided in the other walls of the box-type structure until the required flow rate is obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP93202975A 1992-11-02 1993-10-23 A gas burning apparatus with an atmospheric burner Expired - Lifetime EP0596555B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI922510A IT1256091B (it) 1992-11-02 1992-11-02 Apparecchio per la combustione di gas con un bruciatore atmosferico e metodo per la sua alimentazione
ITMI922510 1992-11-02

Publications (2)

Publication Number Publication Date
EP0596555A1 EP0596555A1 (en) 1994-05-11
EP0596555B1 true EP0596555B1 (en) 1997-12-17

Family

ID=11364215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93202975A Expired - Lifetime EP0596555B1 (en) 1992-11-02 1993-10-23 A gas burning apparatus with an atmospheric burner

Country Status (6)

Country Link
EP (1) EP0596555B1 (it)
CZ (1) CZ288817B6 (it)
DE (1) DE69315804T2 (it)
HU (1) HU217277B (it)
IT (1) IT1256091B (it)
PL (1) PL172493B1 (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9090323B1 (en) 2014-02-12 2015-07-28 Google Inc. Controlling descent of a zero pressure balloon
AU2014262217B2 (en) * 2013-11-14 2016-08-25 Lennox Industries Inc. Double venturi burner

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401564B (de) * 1994-06-06 1996-10-25 Vaillant Gmbh Brenner
FR2730793B1 (fr) * 1995-02-16 1997-04-30 Leblanc Sa E L M Perfectionnements apportes a un bruleur de chauffe-eau, chauffe-bain, chaudiere a gaz
AT402228B (de) * 1995-03-20 1997-03-25 Vaillant Gmbh Brenner mit in einer brennkammer oder unterdruckkammer angeordneten einzelbrennern
US5797355A (en) 1995-04-04 1998-08-25 Srp 687 Pty Ltd Ignition inhibiting gas water heater
US6155211A (en) * 1995-04-04 2000-12-05 Srp 687 Pty Ltd. Air inlets for water heaters
US6003477A (en) * 1995-04-04 1999-12-21 Srp 687 Pty. Ltd. Ignition inhibiting gas water heater
US6196164B1 (en) 1995-04-04 2001-03-06 Srp 687 Pty. Ltd. Ignition inhibiting gas water heater
US6135061A (en) * 1995-04-04 2000-10-24 Srp 687 Pty Ltd. Air inlets for water heaters
US6295951B1 (en) 1995-04-04 2001-10-02 Srp 687 Pty. Ltd. Ignition inhibiting gas water heater
US6085699A (en) * 1995-04-04 2000-07-11 Srp 687 Pty Ltd. Air inlets for water heaters
FR2745891B1 (fr) * 1996-03-07 1998-05-15 Sdecc Bruleur atmospherique a gaz a premelange total
US6142106A (en) * 1998-08-21 2000-11-07 Srp 687 Pty Ltd. Air inlets for combustion chamber of water heater
US6293230B1 (en) * 1998-10-20 2001-09-25 Srp 687 Pty Ltd. Water heaters with flame traps
US6269779B2 (en) 1998-08-21 2001-08-07 Srp 687 Pty Ltd. Sealed access assembly for water heaters
US6302062B2 (en) 1998-08-21 2001-10-16 Srp 687 Pty Ltd. Sealed access assembly for water heaters
US6223697B1 (en) 1998-08-21 2001-05-01 Srp 687 Pty Ltd. Water heater with heat sensitive air inlet
US5950573A (en) * 1998-10-16 1999-09-14 Srp 687 Pty. Ltd. Power vented water heater with air inlet
US9212820B2 (en) 2010-01-15 2015-12-15 Lennox Industries Inc. Furnace burner box
US9429338B2 (en) 2010-01-15 2016-08-30 Lennox Industries Inc. Furnace header box having blocked condensation protection, a furnace including the header box and a blocked condensation protection system
US9335045B2 (en) 2010-01-15 2016-05-10 Lennox Industries Inc. Furnace, a method for operating a furnace and a furnace controller configured for the same
CN104214777B (zh) * 2014-09-29 2016-12-07 广东万和新电气股份有限公司 全预混燃烧的燃气具
IT201700106691A1 (it) * 2017-09-25 2019-03-25 I C I Caldaie S P A Caldaia.
IT201800005589A1 (it) * 2018-05-22 2019-11-22 Bruciatore modulare

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1350787A (fr) * 1962-12-18 1964-01-31 Saunier Duval Brûleur à gaz combiné avec plateau de propreté pour appareils de production instantanée d'eau chaude et chaudières de chauffage central du type mural fonctionnant aux gaz combustibles
GB1297005A (it) * 1969-05-08 1972-11-22
GB1517957A (en) * 1975-07-24 1978-07-19 Aeromatic Co Ltd Aerated gas burner
AT393888B (de) * 1989-12-22 1991-12-27 Vaillant Gmbh Vormischgasbrenner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2014262217B2 (en) * 2013-11-14 2016-08-25 Lennox Industries Inc. Double venturi burner
US9090323B1 (en) 2014-02-12 2015-07-28 Google Inc. Controlling descent of a zero pressure balloon
US9663215B1 (en) 2014-02-12 2017-05-30 X Development Llc Controlling descent of a zero pressure balloon

Also Published As

Publication number Publication date
PL300920A1 (en) 1994-05-16
IT1256091B (it) 1995-11-27
HU217277B (hu) 1999-12-28
HU9303096D0 (en) 1994-01-28
ITMI922510A0 (it) 1992-11-02
CZ233493A3 (en) 1994-05-18
HUT65726A (en) 1994-07-28
DE69315804T2 (de) 1998-07-09
DE69315804D1 (de) 1998-01-29
EP0596555A1 (en) 1994-05-11
PL172493B1 (en) 1997-09-30
CZ288817B6 (cs) 2001-09-12
ITMI922510A1 (it) 1994-05-02

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