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US20100227285A1 - Modulating burner - Google Patents

Modulating burner Download PDF

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Publication number
US20100227285A1
US20100227285A1 US12/601,104 US60110408A US2010227285A1 US 20100227285 A1 US20100227285 A1 US 20100227285A1 US 60110408 A US60110408 A US 60110408A US 2010227285 A1 US2010227285 A1 US 2010227285A1
Authority
US
United States
Prior art keywords
openings
burner
diffuser
canceled
zone
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.)
Abandoned
Application number
US12/601,104
Other languages
English (en)
Inventor
Luca Barozzi
Sandro Lugli
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
Assigned to WORGAS BRUCIATORI S.R.L. reassignment WORGAS BRUCIATORI S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAROZZI, LUCA, LUGLI, SANDRO
Publication of US20100227285A1 publication Critical patent/US20100227285A1/en
Abandoned 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
    • 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
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • 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
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/725—Protection against flame failure by using flame detection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1012—Flame diffusing means characterised by surface shape tubular
    • 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
    • F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Definitions

  • the present invention relates to a modulating burner, in particular to a modulating burner with which an ionization sensor is associated for monitoring the combustion of a mixture of air and fuel delivered to the burner.
  • the ionization sensors are in general associated with burners for controlling the presence of the flame and the quality of combustion.
  • the ionization sensor is arranged near the surface of the diffuser of the burner, so as to be located in the zone affected by the ionisation produced by the flame and to generate a signal that is proportional to the ionization in said zone.
  • the signal S 0 generated by the ionization sensor is also maintained substantially constant or decreases slightly, nevertheless remaining between the values S min and S max until the operating power becomes less than P min , after which it falls sharply below the value S min until it is completely cancelled when ionization intensity falls below the sensibility limit of the sensor, when the operating power becomes less than P 0 .
  • the present invention aims to provide a burner that enables the field of use of an ionization sensor to be extended that is associated with a premixed burner, in operating conditions with a power output below 17-20% of the nominal power of the burner down to operating conditions with power output approximately 10% of the nominal power of the burner.
  • a burner comprising a diffuser in which first openings and second openings are made for the passage of a mixture of fuel and air delivered to the burner, a distributing element arranged inside the burner near said diffuser, said distributing element being provided with further first openings and further second openings for the passage of said mixture, an ionization sensor arranged near a zone of the surface of said diffuser in a direction substantially parallel to the surface of the diffuser, characterised in that said further second openings are arranged at said zone of said diffuser, said further second openings having distribution other than the distribution of said further first openings and/or dimensions greater than said further first openings.
  • the flow of mixture that exits the openings made on the diffuser in the zone near which the ionization sensor is arranged creates combustion conditions that cause ionisation to be kept substantially constant when the operating power of the burner is varied up to approximately 10% of nominal power, so as to enable correct operation of the ionization sensor until said operating power value.
  • the diffuser in the zone adjacent to the ionization sensor has a double row of openings in the shape of slits, that are separated by a surface portion of diffuser devoid of slits, said ionisation probe being arranged parallel to said portion of diffuser devoid of slits.
  • the arrangement of the slits in the zone of the diffuser near which the ionization sensor is arranged contributes to stabilising ionisation in the zone surrounding the flame.
  • FIG. 1 is a schematic perspective view of a first embodiment of a burner according to the invention
  • FIG. 2 is a raised view of the burner in FIG. 1 ;
  • FIG. 3 is section in FIG. 2 ;
  • FIG. 4 is an elevation view of a distributing element associated with the burner in FIG. 1 ;
  • FIG. 5 is a top view of a second embodiment of a burner according to the invention.
  • FIG. 6 is section VI-VI of FIG. 5 ;
  • FIG. 7 a bottom view of the burner in FIG. 5 .
  • FIGS. 1 to 4 a first embodiment of a burner 1 according to the invention is illustrated.
  • the burner 1 has a cylindrical shape with a diffuser 2 mounted between an upper base 3 and a lower base 4 .
  • the upper base 3 has a central ridge 5 facing inside the burner.
  • the lower base 4 has a central ridge 6 , facing inside the burner, in which a central opening 4 a is made for delivering a mixture of air and fuel inside the burner 1 .
  • a distributing element 7 which is also cylinder-shaped, having a dimension that is less than the diameter of the del diffuser 2 , so that a space 8 remains between the external surface of the distributing element 7 and the internal surface of the diffuser 2 .
  • the diffuser 2 is provided with first openings 9 and with second openings 9 a, to enable the mixture to pass from the space 8 to the outside of the burner 1 ; where combustion of the mixture is brought about.
  • the first openings 9 take the shape of holes, whilst the second openings 9 a take the shape of slits.
  • Groups of rows of holes 9 arranged parallel to a longitudinal axis of the burner 1 alternate with rows of slits 9 a, which are also arranged parallel to the axis of the burner 1 .
  • the groups of rows of holes 9 alternate with single rows of slits 9 a, except in a zone A of diffuser in which there are two facing rows 9 b of slits 10 a that are separated by a surface portion B of diffuser devoid of openings.
  • the distributing element 7 is provided with further first openings 10 and with further second openings 10 a , distributed over the entire surface of the distributing element 7 , to enable the passage of the mixture delivered to the burner 1 in said space 8 .
  • the second further openings 10 a of the distributing element 7 are arranged at said zone A of the surface of the diffuser 2 , so that the mixture that passes through the second further openings 10 a exits the diffuser 2 through the rows 9 b of slits 9 a.
  • the second further openings 10 a have a different distribution from the distribution of the further first openings 10 and/or greater dimensions than the dimensions of the further first openings 10 .
  • the further second openings 10 a may have a greater distribution density than the distribution density of the further first openings 10 .
  • Distribution density is defined as the number of openings per surface unit of the distributing element 7 .
  • ionization sensor 11 At the portion B of diffuser there is arranged, in a direction that is substantially parallel to the surface of the diffuser 2 an ionization sensor 11 , represented schematically, in FIG. 2 , by a rectilinear segment.
  • the ionization sensor 11 has a first free end and is fixed at a second end to a supporting element 11 a that can be mounted on the burner 1 or also on a wall of a combustion chamber in which the burner 1 is installed.
  • the number and/or density of the holes 10 a is greater near said second end, whilst it decreases towards said first end.
  • the signal S′ 0 is maintained substantially constant or decreases only slightly up to an operating power value P lim that is noticeably less than the value P lim of a prior-art burner.
  • FIGS. 5 , 6 and 7 there is shown a second embodiment of a burner 1 a according to the invention, in which the diffuser 2 a has a substantially flat surface and consists of a series of diffuser elements 12 that are alongside one another.
  • the distributing element 7 a With the diffuser 2 a a distributing element 7 a is associated, which also has a substantially flat surface.
  • the distributing element 7 a consists of a series of distributing elements 13 that are alongside one another, each arranged inside a corresponding diffuser element 12 . Between each distributing element 13 and the surface of the corresponding diffuser element 12 a space 8 a is defined, in which a mixture of fuel and air is distributed that is delivered to the burner before exiting from the diffuser 2 a.
  • first openings are made consisting of two groups of rows of holes 9 , interrupted by a row of second slit-shaped openings 9 a.
  • a diffuser element 12 a In a diffuser element 12 a, on the other hand, two rows of adjacent slits 9 b are made that are separated by a diffuser zone that is devoid of openings.
  • an ionization sensor 11 is, arranged that is represented schematically in FIG. 5 , with a rectilinear segment.
  • the ionization sensor 11 has a first free end and is fixed at second end to a supporting element 11 a that can be mounted on the burner 1 a or also to a wall of a combustion chamber in which the burner 1 a is installed.
  • Each distributing element 13 is provided with first further openings 10 , in the shape of holes, distributed in a substantially uniform manner on the surface of the distributing element 13 .
  • a distributing element 13 a associated with the diffuser element 12 a , is provided with further second openings 10 a having a different distribution and/or dimensions greater than the first further openings 10 .
  • the further second openings 10 a may have a greater distribution density than the distribution density of the further first openings 10 .
  • the second further openings 10 a are distributed in a substantially similar way to the second further openings 10 a of the distributing element 7 of the burner shown in FIGS. 1 to 4 and perform the same function already disclosed previously.
  • the slits 9 a made in the diffuser 2 of the burner 1 and in the diffuser 2 a of the burner 1 a have, for example, a length comprised between 4 mm and 8 mm and a width comprised between 0.4 mm and 0.8 mm, the length of the slits 9 a is 6 mm, with a width of 0.6 mm.
  • the holes 9 made in the diffuser 2 of the burner 1 and in the diffuser 2 a of the burner 1 a have a diameter of at least 0.7 mm.
  • the dimensions of the holes 10 and 10 a made in the diffuser 7 of the burner 1 and in the distributing elements 13 a of the burner 1 a have a diameter comprised between approximately 2.5 mm and 5 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Control Of Combustion (AREA)
US12/601,104 2007-05-21 2008-05-21 Modulating burner Abandoned US20100227285A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMO2007A000167 2007-05-21
IT000167A ITMO20070167A1 (it) 2007-05-21 2007-05-21 Bruciatore modulante
PCT/IB2008/001258 WO2008142531A2 (fr) 2007-05-21 2008-05-21 Modulation du brûleur

Publications (1)

Publication Number Publication Date
US20100227285A1 true US20100227285A1 (en) 2010-09-09

Family

ID=39875657

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/601,104 Abandoned US20100227285A1 (en) 2007-05-21 2008-05-21 Modulating burner

Country Status (4)

Country Link
US (1) US20100227285A1 (fr)
EP (1) EP2167876B1 (fr)
IT (1) ITMO20070167A1 (fr)
WO (1) WO2008142531A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100291495A1 (en) * 2007-11-19 2010-11-18 Sit La Precisa S.P.A. Con Socio Unico Burner, specifically a premix burner
US20130302741A1 (en) * 2010-11-24 2013-11-14 Worgas Bruciatori S.R.L. High-stability burners
DE102017213767A1 (de) * 2017-08-08 2019-02-14 Robert Bosch Gmbh Brennerabdeckung, Verfahren zur Herstellung einer Brennerabdeckung sowie ein Flächenbrenner

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20071751A1 (it) 2007-09-12 2009-03-13 Polidoro S P A Bruciatore premiscelato
WO2010094673A1 (fr) 2009-02-20 2010-08-26 Bekaert Combust. Technol. B.V. Brûleur à gaz à pré-mélange avec surveillance et régulation améliorées de la flamme
EP2510281B1 (fr) * 2009-12-11 2017-10-25 Bekaert Combustion Technology B.V. Brûleur pourvu d'une plateforme de brûleur à faible porosité
KR101807330B1 (ko) * 2010-03-03 2017-12-08 브로믹 히팅 피티와이 리미티드 바람 방지용 히터
IT1399921B1 (it) * 2010-05-05 2013-05-09 Worgas Bruciatori Srl Bruciatore premiscelato
ITMI20110390A1 (it) * 2011-03-11 2012-09-12 Bertelli & Partners Srl Bruciatore a gas perfezionato per combustione premiscelata
ITVI20110181A1 (it) * 2011-07-05 2013-01-06 Aldo Polidoro Bruciatore di gas combustibile
EP2844920B1 (fr) * 2012-05-03 2016-05-18 Bekaert Combustion Technology B.V. Brûleur à prémélange gazeux
DE202016105039U1 (de) 2016-09-12 2017-09-14 Viessmann Werke Gmbh & Co Kg Gasbrenner
WO2019158382A1 (fr) 2018-02-14 2019-08-22 Bekaert Combustion Technology B.V. Brûleur cylindrique à gaz de pré-mélange
IT202000002209A1 (it) * 2020-02-05 2021-08-05 Polidoro S P A Bruciatore a premiscelamento
EP3910237B1 (fr) * 2020-05-12 2024-06-12 Vaillant GmbH Agencement de brûleur et tôle de distribution
IT202200004688A1 (it) * 2022-03-11 2023-09-11 Beckett Thermal Solutions S R L Bruciatore

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4900245A (en) * 1988-10-25 1990-02-13 Solaronics Infrared heater for fluid immersion apparatus
US6776608B2 (en) * 1999-03-19 2004-08-17 Worgas Bruciatori S.R.L. Method and means for a security control of burners
US20060154191A1 (en) * 2004-06-18 2006-07-13 Worgas Bruciatori S.R.L.. Burner with diffuser resistant to high operating temperatures

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DE1096310B (de) * 1958-01-23 1961-01-05 Faure & Cie Soc Sicherheitsvorrichtung fuer mit Gas gespeiste Heizgeraete
JPS5912230A (ja) * 1982-07-13 1984-01-21 Matsushita Electric Ind Co Ltd 燃焼装置
JPS59157412A (ja) * 1983-02-25 1984-09-06 Hitachi Ltd セラミツクバ−ナ
JPS61116217A (ja) * 1984-11-09 1986-06-03 Matsushita Electric Ind Co Ltd 燃焼装置
JPS62186123A (ja) * 1986-02-07 1987-08-14 Matsushita Electric Ind Co Ltd 燃焼装置
JPH0617729B2 (ja) * 1987-08-03 1994-03-09 ウオルガス ブルチアトリ エセ・エレ・エレ 窒素酸化物及び一酸化炭素の排出量の少ないガスバーナー
AT391197B (de) * 1988-04-28 1990-08-27 Vaillant Gmbh Vorrichtung zur ueberwachung des betriebes der von gemischaustrittsoeffnungen durchsetzten brennerplatte eines flaechenbrenners
ITMO20030154A1 (it) * 2003-05-23 2004-11-24 Worgas Bruciatori Srl Bruciatore modulabile
JP4034749B2 (ja) * 2004-03-29 2008-01-16 リンナイ株式会社 筒状バーナ
JP3958754B2 (ja) * 2004-04-09 2007-08-15 リンナイ株式会社 筒状バーナ
DE102005056499B4 (de) * 2005-11-28 2009-04-23 Ceramat, S. Coop., Asteasu Gasbrenner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4900245A (en) * 1988-10-25 1990-02-13 Solaronics Infrared heater for fluid immersion apparatus
US6776608B2 (en) * 1999-03-19 2004-08-17 Worgas Bruciatori S.R.L. Method and means for a security control of burners
US20060154191A1 (en) * 2004-06-18 2006-07-13 Worgas Bruciatori S.R.L.. Burner with diffuser resistant to high operating temperatures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100291495A1 (en) * 2007-11-19 2010-11-18 Sit La Precisa S.P.A. Con Socio Unico Burner, specifically a premix burner
US20130302741A1 (en) * 2010-11-24 2013-11-14 Worgas Bruciatori S.R.L. High-stability burners
DE102017213767A1 (de) * 2017-08-08 2019-02-14 Robert Bosch Gmbh Brennerabdeckung, Verfahren zur Herstellung einer Brennerabdeckung sowie ein Flächenbrenner

Also Published As

Publication number Publication date
WO2008142531A2 (fr) 2008-11-27
ITMO20070167A1 (it) 2008-11-22
WO2008142531A3 (fr) 2009-08-27
EP2167876A2 (fr) 2010-03-31
EP2167876B1 (fr) 2013-07-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: WORGAS BRUCIATORI S.R.L., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BAROZZI, LUCA;LUGLI, SANDRO;REEL/FRAME:023745/0827

Effective date: 20091217

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION