EP0160134A1 - Ölbrennerkopf - Google Patents

Ölbrennerkopf Download PDF

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Publication number
EP0160134A1
EP0160134A1 EP84302809A EP84302809A EP0160134A1 EP 0160134 A1 EP0160134 A1 EP 0160134A1 EP 84302809 A EP84302809 A EP 84302809A EP 84302809 A EP84302809 A EP 84302809A EP 0160134 A1 EP0160134 A1 EP 0160134A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
air
air passage
surrounding
tubular member
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.)
Ceased
Application number
EP84302809A
Other languages
English (en)
French (fr)
Inventor
Gordon W. Ellis
Horace C. Aubrey
Jacques R. Domey
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.)
Canadian Patents and Development Ltd
Original Assignee
Canadian Patents and Development Ltd
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
Priority to CA000395122A priority Critical patent/CA1167369A/en
Application filed by Canadian Patents and Development Ltd filed Critical Canadian Patents and Development Ltd
Priority to EP84302809A priority patent/EP0160134A1/de
Publication of EP0160134A1 publication Critical patent/EP0160134A1/de
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F23D11/408—Flow influencing devices in the air tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space

Definitions

  • This invention relates to oil burners and particularly to oil burner heads.
  • From one aspect of the present invention it is an object to provide an oil burner head which will facilitate a more efficient use of oil as a fuel.
  • the present invention provides a burner head for the combustion of oil with air to produce a flame comprising: a nozzle for spraying oil under pressure, a first nozzle-surrounding, tubular member surrounding and coaxially spaced from the said nozzle and open at the downstream end, a second tubular member surrounding and coaxially spaced from said first nozzle-surrounding tubular member to form a primary air passage, and, in operation, to provide air to the open downstream end of the first nozzle-surrounding tubular member, a third tubular member surrounding and coaxially spaced from said second tubular member to form a secondary air passage, a first set of annularly arranged deflector vanes in said primary air passage to impart a swirling action to the air passing through said primary air passage, said air having an axial and tangential velocity without any apprecia- .
  • a second set of annularly arranged deflector vanes in said secondary air passage to impart a swirling action to the air passing through said secondary air passage, said air having an axial and tangential velocity without any appreciable radial velocity component at the. exit plane of the burner head, means for causing air to enter said primary air passage and said secondary air passage substantially axially thereof, the lead angles of the first set of vanes and the second set of vanes to the normal to the longitudinal axis of the tubes being in a range of in the order of 50° to 60°, a perforated, annular disc partially blocking and radially inwardly spaced from the downstream end of the first nozzle-surrounding member and providing,
  • From.another aspect of the present invention it is an object to provide a method of combusting oil which will facilitate a more efficient use of oil as a fuel.
  • a method of combusting oil comprising forcing said oil through a nozzle, forcing combustion air through a primary air passage between first and second nozzle-surrounding tubular members and having therein a first set of annularly arranged deflector vanes to impart a swirling motion to the air passing through said primary air passage with an axial and tangential velocity without any a p pre- ciable radial velocity component, forcing combustion air through a secondary air passage between said second and a third nozzle-surrounding tubular member and having therein a second set of annularly arranged deflector vanes to impart a swirling motion to the air passing through said secondary air passage with an axial and tangential velocity without any appreciable radial velocity component, arranging the lead angles of the first set of vanes and the second set of vanes to the normal to the longitudinal axis of the tubes to be in a range of in the order of 50° to 60°, providing an igniter assembly externally of said air passages containing deflect
  • the oil burner head includes a nozzle 2 for spraying oil under pressure and a first nozzle-surrounding tubular member 4 which surrounds and is coaxially spaced from the nozzle 2 to form a nozzle space.
  • the tubular member 4 is open at the downstream end 6 thereof.
  • a second nozzle-surrounding tubular member 8 having a diameter larger than the tubular member 4 is provided coaxially located with respect of the tubular member 4 and the nozzle 2.
  • a primary air passage 10 is thus formed between the first tubular member 4 and the second tubular member 8.
  • a third nozzle-surrounding tubular member 12 is provided of a larger diameter than the tubular member 8 and located coaxially therewith. Thus a secondary air passage 14 is provided between the second tubular member 8 and the third tubular member 12.
  • a first set of annularly arranged deflector vanes 16, sometimes called fins, is provided in the primary air passage 10 to impart a swirling action to air passing through the primary air passage whilst a second set of annularly arranged deflector vanes 18 is provided in the secondary air passage 14 to impart'a swirling action in the same rotational direction to air passing through the secondary air passage.
  • the arrangement of the vanes, and the corresponding dimensions, is such that two hollow cylindrical volumes of air exit the primary and secondary air passages with a tangential velocity, due to the angle of the vanes in the respective passage.
  • the velocity of the two air volumes is different, due to the different dimensions and restrictions in the two air passages, and this results in a cylindrical region of shear between the two air flows causing significant turbulences.
  • the air meeting the oil in this region of turbulence combined with the rotational velocity of the air produces excellent mixing between the air and the oil from nozzle 2 and a radial movement of the oil droplets.
  • the lead angles of the- first and second sets of vanes, 16 and 18, to the normal to the longitudinal axis 20 is in the range of the order of 50° to 60°.
  • a perforated annular disc 22 is provided and this partially blocks, and is radially inwardly spaced from, the downstream end of the first nozzle-surrounding member 4.
  • the spacing is obtained by providing the disc 22 with three spacing tabs 24 which are used to weld the disc 22 to the first nozzle-surrounding tubular member 4.
  • a space 26 is formed between the disc 22 and the tubular member 4.
  • oil passes through a central aperture 28 whilst air is forced through surrounding perforations 30 in the annular disc 22.
  • the central aperture 28 has a diameter of 0.15 inches whilst the surrounding perforations 30 have a diameter of 0.024 inches.
  • Thirty two surrounding perforations 30 are provided in the disc 22 and these are arranged in two concentric rings as shown in Figures 1 and 3 to substantially reduce the formation of an air void downstream of the nozzle outlet.
  • the disc 22 acts as a heat shield for the nozzle 2 protecting it from radiant heat reflected from the fire pot (not shown) whilst the air flow through perforations 30 and .
  • the gap between the disc and the inner surface of the first tubular member substantially reduces the formation of an air void downstream of the nozzle outlet, the resulting flame being a sun-flower shaped flame.
  • FIG 4 the shape of the vanes 16 can be clearly seen on the external surface of the first tubular member 4.
  • Figure 5 is a rolled-out or flat layout corresponding to Figure 4 to illustrate the vanes 16 having a 55° lead angle of fin, i.e. 55° to the normal to the longitudinal axis 20 of the oil burner nozzle in the illustrated practical embodiment.
  • perforations 30 have been shown as circular, it will be understood that they might be of different shapes, size or number, for example they may be rectangular slots. In different constructed embodiments the number of vanes has been 8 and 12 and it would thus appear that the range in the required number of vanes is relatively large.
  • the oil supply for the oil burner atomizing nozzle 2 is fed along an oil feed line 23 whilst ignition electrodes 25 and 27 are connected to an electrical supply line by way of terminals such as 29 surrounded by a high voltage insulator 31.
  • the oil burner head is particularly suitable as a retro-fit oil burner head for fitting in existing oil furnaces, and also this new burner or retrofitted oil burner can be installed in most existing furnaces without requiring major modifications to the furnace itself.
  • Most standard house burner can supply the required volume of combustion air at a barrel pressure in the range of 0.25 to 0.35 inches of water which is necessary to achieve the velocities required in the two air passages 10 and 14, so as to provide the turbulence downstream of the outlet of these air passages to obtain the required mixing.
  • the illustrated head provides a twin air passage whereby air is combined with oil spray from a standard oil burner nozzle to produce a very low carbon (soot) content (clean fire) and high carbon dioxide content flue gases.
  • a nozzle adapter with disc 22 may be placed in front of the nozzle with the appropriate perforations and aperture as discussed above. Thus the nozzle is maintained cool on its operation cycle and the disc acts as a radiation shield after burner shut-down. Air is metered in the rear of the nozzle adapter tube. It was found that one constructed head would operate with two different nozzle sizes (0.5 U.S. gallons per hour, GPH, and 0.65 US GPH).
  • the perforated disc supplies enough air in the centre to produce an over pressure in that central area to avoid an inflow of the air oil mixture and avoid combustion in that area which would raise the temperature of the nozzle and also shields the nozzle from the radiant heat of the fire p ot.
  • the electrode assembly is not located in the critical air flow path in the head and downstream-of the head, but there is still enough room for the high voltage conductors to be installed in the barrel of the oil burner and go through the face of the burner head outside of the air flow. Only the electrodes themselves are placed in the air flow so that the spark is blown in the oil air mixture to ensure immediate ignition.
  • the perforations in the disc are there to:
  • a common problem with oil burner heads is the positioning electrodes without disturbing flow of combustion air and without requiring significant modifications to oil burners and furnaces which would make them uncompatible with existing furnaces.
  • Ignition of the air oil mixture should occur within a fraction of a second after the oil spray has started.
  • the head illustrated produces a symmetrical sun-flower flame which contributes to better mixing of oil with air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Spray-Type Burners (AREA)
EP84302809A 1982-01-28 1984-04-25 Ölbrennerkopf Ceased EP0160134A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA000395122A CA1167369A (en) 1982-01-28 1982-01-28 Oil burner head
EP84302809A EP0160134A1 (de) 1982-01-28 1984-04-25 Ölbrennerkopf

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000395122A CA1167369A (en) 1982-01-28 1982-01-28 Oil burner head
EP84302809A EP0160134A1 (de) 1982-01-28 1984-04-25 Ölbrennerkopf

Publications (1)

Publication Number Publication Date
EP0160134A1 true EP0160134A1 (de) 1985-11-06

Family

ID=25669545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84302809A Ceased EP0160134A1 (de) 1982-01-28 1984-04-25 Ölbrennerkopf

Country Status (2)

Country Link
EP (1) EP0160134A1 (de)
CA (1) CA1167369A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT400182B (de) * 1993-10-28 1995-10-25 Vaillant Gmbh Ölbrenner
FR2728329A1 (fr) * 1994-12-14 1996-06-21 Carrasco Antoine Bruleur pour foyer industriel, notamment pour foyer de four rotatif a ambiance dite froide et turbulente
EP1705424A1 (de) * 2005-03-04 2006-09-27 Riello S.p.a. Brennerkopf für Flüssigbrennstoffbrenner
JP2015072118A (ja) * 2014-11-26 2015-04-16 三菱重工業株式会社 油焚きバーナ、固体燃料焚きバーナユニット及び固体燃料焚きボイラ
US9702545B2 (en) 2011-11-16 2017-07-11 Mitsubishi Heavy Industries, Ltd. Oil-fired burner, solid fuel-fired burner unit, and solid fuel-fired boiler

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN167338B (de) * 1985-05-23 1990-10-06 Bera Anstalt
JP5023526B2 (ja) 2006-03-23 2012-09-12 株式会社Ｉｈｉ 燃焼器用バーナ及び燃焼方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976097A (en) * 1932-02-15 1934-10-09 Milwaukee Reliance Boiler Work Fluid fuel burner
GB419852A (en) * 1933-03-14 1934-11-20 Adolf Bargeboer A device for burning atomized liquid fuel
US2803296A (en) * 1952-06-05 1957-08-20 Young Cyril Charles Combustion head for burner apparatus
CH363428A (de) * 1958-06-30 1962-07-31 Steyer Werner Brennerkopf an einem Druckzerstäuber-Ölbrenner
DE2626846A1 (de) * 1975-06-27 1977-01-13 Canadian Patents Dev Oelbrenner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976097A (en) * 1932-02-15 1934-10-09 Milwaukee Reliance Boiler Work Fluid fuel burner
GB419852A (en) * 1933-03-14 1934-11-20 Adolf Bargeboer A device for burning atomized liquid fuel
US2803296A (en) * 1952-06-05 1957-08-20 Young Cyril Charles Combustion head for burner apparatus
CH363428A (de) * 1958-06-30 1962-07-31 Steyer Werner Brennerkopf an einem Druckzerstäuber-Ölbrenner
DE2626846A1 (de) * 1975-06-27 1977-01-13 Canadian Patents Dev Oelbrenner

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT400182B (de) * 1993-10-28 1995-10-25 Vaillant Gmbh Ölbrenner
FR2728329A1 (fr) * 1994-12-14 1996-06-21 Carrasco Antoine Bruleur pour foyer industriel, notamment pour foyer de four rotatif a ambiance dite froide et turbulente
EP1705424A1 (de) * 2005-03-04 2006-09-27 Riello S.p.a. Brennerkopf für Flüssigbrennstoffbrenner
US9702545B2 (en) 2011-11-16 2017-07-11 Mitsubishi Heavy Industries, Ltd. Oil-fired burner, solid fuel-fired burner unit, and solid fuel-fired boiler
JP2015072118A (ja) * 2014-11-26 2015-04-16 三菱重工業株式会社 油焚きバーナ、固体燃料焚きバーナユニット及び固体燃料焚きボイラ

Also Published As

Publication number Publication date
CA1167369A (en) 1984-05-15

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT SE

17P Request for examination filed

Effective date: 19860429

17Q First examination report despatched

Effective date: 19870122

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19870925

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DOMEY, JACQUES R.

Inventor name: AUBREY, HORACE C.

Inventor name: ELLIS, GORDON W.