US3485452A - Mineral oil burner - Google Patents

Mineral oil burner Download PDF

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Publication number
US3485452A
US3485452A US668892A US3485452DA US3485452A US 3485452 A US3485452 A US 3485452A US 668892 A US668892 A US 668892A US 3485452D A US3485452D A US 3485452DA US 3485452 A US3485452 A US 3485452A
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US
United States
Prior art keywords
air
piece
tube
jet
gap
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
US668892A
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English (en)
Inventor
Gino Sborlino
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.)
IORO AND PARISINI
Original Assignee
IORO AND PARISINI
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 IORO AND PARISINI filed Critical IORO AND PARISINI
Application granted granted Critical
Publication of US3485452A publication Critical patent/US3485452A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
    • A61K31/19—Carboxylic acids, e.g. valproic acid
    • 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
    • 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
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • 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
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/12—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour characterised by the shape or arrangement of the outlets from the nozzle

Definitions

  • a burner for liquid fuel having a central jet of auxiliary air surrounded by an atomizing air jet issuing from a gap between an outer noncylindrical stationary pipe and an inner noncylindrical tubular body, in which gap the fuel is injected, the switch of said gap being adjustable by moving the said tubular body axially.
  • This invention relates to a burner for liquid fuels, more particularly mineral oil, of the kind in which the atomization of oil is obtained by a jet of low pressure air.
  • Burners of the kind referred to above are employed, for example, for heating large rotary-drum dryers within which the inert substances intended to make up the bitumen mixes for road surfacing are dried.
  • the air blown under a low pressure is generally divided into two concentric jets, one of which is intended to atomize the oil as sprayed by specially provided nozzles, whereas the other jet supplies the secondary air which is necessary to ensure a proper formation of the flame.
  • the atomization is brought about a central air jet surrounded by a jet of secondary air.
  • the inventive burner is of the kind in which the atomization of fuel oil takes place by virtue of a jet having an annular cross-sectional shape, Within which the central jet of secondary air is located. In such burners, the flame tends to be concentrated about said central jet without being radially scattered.
  • a principal object of the present invention is to provide, in a burner of the kind last referred to, a satisfactory rate of flow for the atomizing air jet with a rate of flow of fuel oil which can be varied within a reasonably wide range, all this without significantly varying the rate of flow of secondary air.
  • This object could be acheived by varying the pressure of the air which feeds the atomization jet.
  • a particular object of the present invention is to provide a burner operable at low pressures with a central jet of secondary air surrounded by an atomizing air jet, in which the rate of flow of the atomizing jet can be varied to suit a variable rate of flow for the fuel oil, still without varying the speed of the atomizing air and without varying the rate of flow of the central jet of secondary air.
  • the inventive burner comprises a pipe whose front end is open and which is fed from the rear by a source of pressurized air and containing in its front end a tubular piece leaving a gap between itself and the tube, said tubular piece being connected to a duct fed with pressurized oil which opens into said gap through a plurality of openings, and is characterized in that the inner surface of the front end of said tube and the outer surface of said tubular piece have a variable cross-sectional area, means being further provided for varying the mutual position between the front end of said tube. and said tubular piece in an axial direction.
  • the burner shown in the drawing comprises a baseplate 1, internally hollowed out, which is extended into a tubular portion 2 containing the members for dividing and delivering the primary :air and for delivering the oil.
  • These members comprise a tubular piece 3 inserted into the end of the part 2, whose inner surface has a circular cross-section of variable diameter, as shown in the drawing: more detailedly, starting from the interior of the body 1, said cross-sectional area is gradually decreased, to be then increased and decreased once again, it being terminated by a short substantially cylindrical portion which is confined by a sharp outlet edge.
  • a tube 4 Within the body 1 is axially and slidably supported a tube 4 by means of the bush 5 and a few fins 6 whose projecting portions 7 slide on the inner surface of the portion 2.
  • One end of the tube 4 is within the tubular piece 3: on said end is mounted also a piece 8, also of tubular shape, connected to the tube 4 by spokes 9 in which thin ducts 10 are formed, which communicate with the end of the tube 4 and open out of the piece 8, where the latter has its highest diameter, in the gap 11 between the pieces 8 and 3.
  • the shape of the outer surface of the piece 8 is not cylindrical, but it has cross-sectional areas whose diameters vary, roughly with the same trend with which the cross-sectional area of the cavity of the piece 3 varies.
  • the thickness of the gap 11 is roughly constant when the piece 8 is in the position shown in the drawing, whereas it can be throttled, to a larger or lesser extent, by axially displacing the piece 8.
  • the other end of the tube 4 which comes out of the body 1 through the bush 5 carries a sleeve 12 which is externally splined and which meshes with a gear 13: thus the latter, by being rotated, can cause the tube 4 to be axially shifted.
  • a hose 14 connected to a source of pressurized oil via a valve 15.
  • This valve is opened more or less by any conventional control, diagrammatically shown at 16 in the drawing.
  • This valve is controlled by a lever 17 connected through a rod 18 to a lever 19 fixed to said gear 13.
  • the body 1 has a lower aperture which can be totally or partially closed in an adjustable way by a conventional valve which is depicted in the drawing by two symmetrical vanes 20 pivoted at 21.
  • This opening is fed by air at a comparatively low pressure, that is, in the order of one meter of column of water, by a blower which has been omitted from the drawing for the sake of clarity.
  • the burner as described above operates as follows.
  • the cross-sectional area of the gap 1 ⁇ is more or less throttled in the vicinity of the outlet of the ducts 10.
  • the pressure of the air which is fed to the gap 11 assuming that the valve 20 is at stand-still, is always virtually constant and equals the pressure fed into the interior of the body 8, the result is that, by shifting the tube 4 axially by rotating the gear 13, the rate of flow of the atomizing air, which is just the air flowing through the gap 11, can be varied without varying the feeding pressure and thus maintain its outflow speed, and also its atomizing efliciency, virtually unaltered.
  • thermometric member such as diagrammatically shown at 22.
  • the exemplary embodiment shown herein can be variously modified: for example the position of the tube 4 and of the piece 8 could be maintained unvaried and the piece 3 could be made axially displaceable within the part 2.
  • a burner for liquid fuels comprising a tube with an inner surface having a cross-section which is variable along the axis of said tube, a tubular piece within said tube and coaxial therewith, with an outer surface having a cross section which is variable along said axis, a gap between said tubular piece and said tube, a conduit for the fuel within said tubular piece terminating into a plurality of perforations on the region of greatest crosssection of the outer surface of said tubular piece, means for conveying compressed air to one end of said tube, whereby said air passes through said tubular piece and through said gap, and means for displacing said tubular piece axially with respect to said tube.
US668892A 1966-09-24 1967-09-19 Mineral oil burner Expired - Lifetime US3485452A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2280966 1966-09-24

Publications (1)

Publication Number Publication Date
US3485452A true US3485452A (en) 1969-12-23

Family

ID=11200670

Family Applications (1)

Application Number Title Priority Date Filing Date
US668892A Expired - Lifetime US3485452A (en) 1966-09-24 1967-09-19 Mineral oil burner

Country Status (5)

Country Link
US (1) US3485452A (fr)
AT (1) AT270036B (fr)
CH (1) CH452764A (fr)
FR (1) FR1540577A (fr)
GB (1) GB1132030A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633822A (en) * 1970-07-06 1972-01-11 Rain Jet Corp Liquid discharge nozzle with air injection feature
US4162888A (en) * 1977-03-22 1979-07-31 Hermann Kopp Burner for liquid fuels

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3525161A1 (de) * 1985-03-05 1986-09-11 DFVLR-Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln Verfahren und vorrichtung zur verschleissarmen zerstaeubung von fluessigen hochviskosen und/oder suspensiven brennstoffen fuer die verbrennung oder vergasung in brennerflammen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531538A (en) * 1948-05-06 1950-11-28 Cecil W Smith Air control unit for oil burners
US3091283A (en) * 1960-02-24 1963-05-28 Babcock & Wilcox Co Liquid fuel burner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531538A (en) * 1948-05-06 1950-11-28 Cecil W Smith Air control unit for oil burners
US3091283A (en) * 1960-02-24 1963-05-28 Babcock & Wilcox Co Liquid fuel burner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633822A (en) * 1970-07-06 1972-01-11 Rain Jet Corp Liquid discharge nozzle with air injection feature
US4162888A (en) * 1977-03-22 1979-07-31 Hermann Kopp Burner for liquid fuels

Also Published As

Publication number Publication date
FR1540577A (fr) 1968-09-27
AT270036B (de) 1969-04-10
CH452764A (it) 1968-03-15
GB1132030A (en) 1968-10-30

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