US3330326A - Flameless radiant burner - Google Patents

Flameless radiant burner Download PDF

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Publication number
US3330326A
US3330326A US457573A US45757365A US3330326A US 3330326 A US3330326 A US 3330326A US 457573 A US457573 A US 457573A US 45757365 A US45757365 A US 45757365A US 3330326 A US3330326 A US 3330326A
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US
United States
Prior art keywords
conduits
burner
refractory material
air
grooves
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
US457573A
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English (en)
Inventor
Gomi Shinpei
Hara Naoyoshi
Kawajiri Nobuki
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.)
Kureha Corp
Chiyoda Corp
Original Assignee
Kureha Corp
Chiyoda Chemical Engineering and Construction Co 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
Application filed by Kureha Corp, Chiyoda Chemical Engineering and Construction Co Ltd filed Critical Kureha Corp
Application granted granted Critical
Publication of US3330326A publication Critical patent/US3330326A/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
    • F23D14/12—Radiant burners
    • F23D14/125—Radiant burners heating a wall surface to incandescence

Definitions

  • the present invention relates to a ameless radiant burner, and more particularly to a flameless radiant burner whereby materials are heated to a desired temperature over a wide range.
  • a radiation burner wherein a burner tip is located in the center of a bowl-shaped burner tile and the pre-mixed gas is ejected radially from said burner tip to eect surface combustion in a concave surface of the burner tile.
  • a burner of this type is installed in a furnace, there will be too wide a space between burners, rendering it difficult to uniformly heat the material in a belt zone.
  • the radiation type burner according to the present invention is provided.
  • a cooling effect caused by feed gas is utilized and also a most effective method is employed to stabilize the flame and make it possible to eject fuel at a high speed.
  • the present invention is also charac-terized in that, as will be described hereinbelow, the desired radiation heating is attained -by controlling combustion over a wide range, with a wide variation of fuel, without causing a flashback or blow-olf of iiame.
  • An object of the present invention is to provide a ameless radiant burner whereby materials are heated uniformly and at a desired temperature for carrying out endothermic chemical reactions or high temperature heat treatments of metallic material, or the like. More particularly, the present invention is intended to provide a radiation type ameless burner whereby an amount of combustion is easily controlled over a wide range by preparing a combustible mixture of gas wherein a part or all of oxygen or air needed for combustion is pre-mixed by means of an aspirator, the latter being adapted to aspirate air in an amount which is dependent upon the kind and flow of fuel gas of a wide variation, and which is close to a theoretical value thereof for the combustion, or by other similar means.
  • the mixture gas is then passed into a header of a unit burner and to a Iplurality of conduits branching olf from said header, the gas being passed through the conduits at a high speed suilcient to cause a cooling effect thereon so as to prevent a liashback from occurring, after which the gas arne is ejected radially from a plurality of ejection openings arranged radially at the tip of said conduits, which openings extend at an 3,330,326 Patented July 11, 1967 angle less than 30 degrees to the inner surface of refractories.
  • the -gas is ejected at a speed higher than that of flame propagation, causing these adjoining flames to impinge with each other, and thereby stabilizing the ames on a surface of a burner tile formed with plurality of grooves or projections, thereby completing the combustion rapidly.
  • FIG. 1 is a perspective view with one part broken away, showing a burner assembly according to the present invention
  • FIG. 2 is a cross section View taken perpendicularly to the longitudinal axis of the header in FIG. 1;
  • FIG. 3 is a view showing a part of the radiant surface on the refractories.
  • an aspirator is jointly used with a burner according to the present invention.
  • air fuel mixing tube gas is mixed with air, increasing the static pressure thereof and then is passed through a header entrance M, whereupon it enters a header G of the burner.
  • the mixed gas passes at a high speed through a plurality -of replaceable conduits E mounted on said header G -by threaded connectors F while cooling said conduits, is ejected at a high speed from a plurality of gas -ejecting holes N provided radially on a tip of each of said conduits E, and is ignited to heat inner surface of burner tiles H.
  • I designates a heat insulating material, and I a mounting plate for securing the burner block onto the furnace.
  • the header G is large enough to dispense mixed gas uniformly to each conduit E, but the capacity thereof should be preferably small to allow for a possible hazard in case of the mixed gas in said header G being ignited and exploded.
  • the surface of burner tiles H is made of refractories and is provided with grooves, inclined planes or projections P, P spaced suitably from the ends of said conduits E, namely i.e., the burner tips.
  • Those grooves and projections not only serve as a means for stabilizing the flame, but also provide an incandescent surface over the whole burner tile, that is, an effective radiant surface.
  • the amount of air entering through the air suction mouth C of the aspirator is determined by a size of said nozzle B, irrespective of the flow of fuel in case the composition of fuel is not changed.
  • the amount ⁇ of air may also be adjusted by opening or shutting shutter K.
  • the mixed gas fed into the burner may often have a composition of detonating gas. It enters from entrance M, passes through header G, threaded connector F and conduit E, and is then ejected from ejecting hole N, and completes combustion in the proximity of the surface ⁇ of burner tiles H.
  • the ejecting holes are perforated at an angle 0 of 30 degrees or less to the surface perpendicular to the longitudinal axis of the conduits E.
  • insulating material I constitutes a part of the burner block and prevents heat from being conducted to the eX- terior of the furnace.
  • the main body of the burner is incorporated into the furnace L by means of mounting plates J.
  • reference characters a and b show the end surfaces -ofthe burner tips, i.e., the conduits E.
  • the reference characters C1, C2, C3, C4 and C5 show the directions of the llames ejected radially out of ejection holes N shown in FIGURE 2.
  • the radiation type burner according to the present invention has several advantages.
  • the primary advantage isY that a plurality of conduits E are arranged at an interval smaller than twice the length of each llameV ejected from the ejection hole N, and that the flames ejected from the adjoining conduits are mutually-impinged and interfered to stabilize themselves, the combustion therefore being completed in an extremely short time.
  • the second advantage is that the burner tips are separated from the header by means of conduits E having a Yproper section, and that by cooling said conduits E by means lof cooled mixture ⁇ gas passingY therethrough at high speed, heat of said burner tips is prevented from being transferred to the header.
  • a relationradiation burner adapted time in adjusting the temperature will enable a prompt andY precise thermal change, will cause no pulsating change to occur, and is therefore suitable for automation of heating.
  • Table 1 shows a result of the testV conducted on three different types of burners designated Type TABLE l Type of burner Shape of burner:
  • each of the burner tiles H is provided with a plurality of suitable grooves and projections P, P. This causes gas to burn on the surface of projections P located close to the burner tips in case an amount of combustion gas is small.
  • combustion gas is increased, combustion is performed on the projection P more remote from the burner tips so as to stabilize the liiames and to prevent the same :from being extinguished.
  • a proper spacing is maintained between burner tips and projections on the burner tile and an exposed portion of the metallic burner tips out of the tile surface is made extremely small.
  • ejection holes are provided in a direction ⁇ away :from the adjoining burner tip, so as to prevent adjoining burner tips from being overheated, thereby preventing a ashback.
  • the fourth advantage is that the burner tips can be arranged in a row or in other proper pattern on a plane or Ycurved surface so asY to be combined into one block of an unit'bnrner, and that by 4fitting a plurality'of said blocks onto the furnace and iby regulating each of them to meet different combustion conditions, the material can be heated uniformly and at a desired temperature gradient. Therefore, the burner according to the present invention is most suited for the precise heating adjustments required in endothermic chemical reactions.
  • the fifth advantage isfthat the present burner is a TAB LE 2 Kind of fuel gas ZNet-3.5.39: O
  • Comparison testing 2 Y (Eiect of projections on burner tile) The following three kinds of burner tiles have been used in a combustion testing under a-condition similar to that as shown in Table l-A,
  • burnertiles each having a flat surface
  • V(b) burner tiles each having many conical projectionsY of 3-5 mm. width and 3-5'mm. height to be adjusted over a wideV range. It will therefore meet a variation of conditions of Y. the material to beheated, will take a surprisingly short ⁇
  • Heat generated at a blow-off point was found to be 40 103 Kcal./hr. in case of (a), l00 103 KcaL/hr. in case of (b), 120x103 KcaL/hr. in case of (c).
  • burner tiles having suitable grooves and projections are very effective for preventing a blow-off of the ame.
  • a radiation type burner comprising an air-fuel mixing tube; a header embedded in refractory material and connected to one end of said tube; a plurality of parallel conduits in at least one row, one end of each of said conduits being connected to said header in said refractory material, the other end of each of said conduits extending outwardly from said refractory material and having a plurality of air-fuel mixture ejecting openings formed therein; and a plurality of parallel grooves formed in the surface of said refractory material from Which said other ends of the conduits extend, said grooves being spaced a predetermined distance from said conduits, extending at right angles thereto, and being of a semicircular cross section; said openings extending towards said grooves at an angle with respect to the longitudinal axes of said conduits; and ejecting means to eject an air-gas mixture into said tube and through said openings at such a pressure that the air-gas mixture will impinge said refractory material substantially at said grooves; the spacing between two
  • each conduit embedded in said refractory material is such that heat from said other end of each conduit is prevented from being transferred to the header.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
US457573A 1964-05-21 1965-05-21 Flameless radiant burner Expired - Lifetime US3330326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2838164 1964-05-21

Publications (1)

Publication Number Publication Date
US3330326A true US3330326A (en) 1967-07-11

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Application Number Title Priority Date Filing Date
US457573A Expired - Lifetime US3330326A (en) 1964-05-21 1965-05-21 Flameless radiant burner

Country Status (5)

Country Link
US (1) US3330326A (enrdf_load_stackoverflow)
FR (1) FR1434000A (enrdf_load_stackoverflow)
GB (1) GB1095514A (enrdf_load_stackoverflow)
NL (1) NL6506498A (enrdf_load_stackoverflow)
SE (1) SE319260B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597135A (en) * 1969-04-30 1971-08-03 Inst Gas Technology Gas burner structure
US20060035182A1 (en) * 2004-08-13 2006-02-16 Hesse David J Detonation safety in microchannels

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179071A (en) * 1978-07-07 1979-12-18 Wahlco, Inc. Industrial sulfur trioxide gas injection probe and method of manufacture

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1754603A (en) * 1928-05-28 1930-04-15 Charles J Brown Furnace gas burner
US2011283A (en) * 1930-04-28 1935-08-13 Lyman C Huff Apparatus for efficiently burning fluid fuels
US2474313A (en) * 1943-10-25 1949-06-28 Selas Corp Of America Incandescent gas burner for furnace walls
US2486018A (en) * 1947-05-03 1949-10-25 Ernst A Furkert Fluid fuel burner having laterally directed flame ports
US3105541A (en) * 1960-07-22 1963-10-01 Sullivan Valve & Engineering Co Gas burner construction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1754603A (en) * 1928-05-28 1930-04-15 Charles J Brown Furnace gas burner
US2011283A (en) * 1930-04-28 1935-08-13 Lyman C Huff Apparatus for efficiently burning fluid fuels
US2474313A (en) * 1943-10-25 1949-06-28 Selas Corp Of America Incandescent gas burner for furnace walls
US2486018A (en) * 1947-05-03 1949-10-25 Ernst A Furkert Fluid fuel burner having laterally directed flame ports
US3105541A (en) * 1960-07-22 1963-10-01 Sullivan Valve & Engineering Co Gas burner construction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597135A (en) * 1969-04-30 1971-08-03 Inst Gas Technology Gas burner structure
US20060035182A1 (en) * 2004-08-13 2006-02-16 Hesse David J Detonation safety in microchannels
US8517717B2 (en) * 2004-08-13 2013-08-27 Velocys, Inc. Detonation safety in microchannels

Also Published As

Publication number Publication date
SE319260B (enrdf_load_stackoverflow) 1970-01-12
GB1095514A (enrdf_load_stackoverflow) 1967-12-20
FR1434000A (fr) 1966-04-01
NL6506498A (enrdf_load_stackoverflow) 1965-07-26

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