US3723049A - Resonance control for a muffle burner - Google Patents

Resonance control for a muffle burner Download PDF

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Publication number
US3723049A
US3723049A US00146978A US3723049DA US3723049A US 3723049 A US3723049 A US 3723049A US 00146978 A US00146978 A US 00146978A US 3723049D A US3723049D A US 3723049DA US 3723049 A US3723049 A US 3723049A
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US
United States
Prior art keywords
air
duct
ducts
direction changing
set forth
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
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US00146978A
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English (en)
Inventor
E Juricek
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.)
Sulzer AG
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Sulzer AG
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Filing date
Publication date
Priority claimed from CH805670A external-priority patent/CH524102A/de
Application filed by Sulzer AG filed Critical Sulzer AG
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Publication of US3723049A publication Critical patent/US3723049A/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
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/008—Flow control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement

Definitions

  • This invention relates to a muffle burner and, more particularly, to a muffle burner having central means for supplying oil and/or gas fuel. Still more particularly, this invention relates to a resonance control for a muffle burner.
  • Muffle burners have been known, such as those described in U.S. patent application Ser. No. 880,683, filed Nov. 28, 1969 and now U.S. Pat. No. 3,612,737, which comprise a central meansfor supplying oil and/or gas fuel, a means surrounding the fuel supply means for supplying combustion air and having disposed therein means for imparting a swirl to the air flowing therethrough, and an adjoining refractory muffle.
  • These swirl type muffle burners have the control means for supplying the liquid or gaseous fuel surrounded by at least two concentric annular combustion air supply ducts, each of which has a means disposed therein for imparting twist to the air flowing therethrough.
  • the construction is such that, over the entire load range, the velocity of the air leaving the innermost of the annular ducts is greater than the velocity of the air leaving the outermost of the annular ducts and the tangential velocity component of the air discharged from the innermost of the annular duct is greater than the tangential velocity component of the air discharged from the outermost of the annular ducts.
  • the invention provides a muffle burner which includes a central fuel supply means, a combustion air supply means having at least two annular ducts surrounding the fuel supply means, and twist imparting means in each duct to cause the discharged air to have a tangential velocity component with a means for adjustably changing the direction of the air flowing to at least one of the twist imparting means.
  • This direction changing means has been found to reduce or suppress the resonance phenomena easily and effectively with very little change in the total flow of air through the burner or in the distribution of the air flow between the ducts.
  • the direction changing means are so constructed that, in use, the maximum change of direction produced thereby is such that the change in the magnitude of the tangential velocity component at the outlet of the associated twist imparting means is less than percent.
  • the direction changing means comprises a plurality of vanes located adjacent the inlet of the outermost of the annular air ducts and distributed around the circumference of the duct, and means for adjusting the vanes relative to the duct.
  • the meansfor adjusting the vanes is controllable from a position remote from the outermost duct such that the vanes can be-adjusted from outside the muffle burner.
  • the vanes can be connected in common so as to be adjusted in unison.
  • the drawing illustrates a cross-sectional view of a muffle burner constructed in accordance with the invention.
  • the muffle burner 1 has a cylindrical air distribution box 2 to which a duct 3 for supplying combustion air to the burner is connected.
  • the duct 3 is disposed with respect to the box 2 so that the air flows tangentially into the box 2 as is known, e.g. as described in the above mentioned patent.
  • a burner lance 4 is located at the center of the distribution box 2 and is supplied with liquid and/or gaseous fuel via a pipeline 5.
  • a muffle 18 constructed of suitable ceramic material defines a combustion chamber of the burner l at the outlet of the lance 4.
  • the burner lance 4 is surrounded by two tubular members 9, 10 each of which flares out in trumpet fashion at the left hand end, as viewed in the drawing.
  • An outer annular duct 40 is formed between the tubular members 9, l0 and an inner annular duct 50 is formed between the burner lance 4 and the inner tubular member 9. Also, a swirl means 11, 12 is positioned respectively in each of the annular .ducts 40,.50 for imparting twist to the air for combustion flowing through the ducts 40, 50.
  • the intensity of the swirl in the annular duct 40 differs from that in the annular duct 50, but the directions of the swirls at the outlets from the two ducts are the same.
  • the swirl means ll, 12 as in the above mentioned patent are so constructed that the tangential velocity component of the air discharged from the inner annular duct 50 is greater than the tangential velocity component of the air discharged from the outer annular duct 40, while the velocity of the air leaving the inner annular duct 50 is greater than the velocity of the air leaving the outer annular duct 40.
  • a sleeve 15 is axially displaceably mounted on the trumpet-shaped end of the tubular member 10. This sleeve 15 allows a greater or lesser air flow through the annular duct 40, depending upon the position thereof.
  • the sliding movement of the sleeve 15 is produced by a linkage 116 which is controlled from outside the air distribution box 2, for example, by a means as described in U.S. patent application Ser. No. 89,563 filed Nov. 16, 1970 now US. Pat. No. 3,649,155.
  • a means for controlling the resonance of the burner 1 includes a plurality of vanes 162, e.g. six, which are mounted between the trumpet-flared ends of the tubular members 9, 10 and are distributed uniformly around the periphery of the members 9, 10.
  • Each vane 162 is attached to a spindle 161 which is pivotally mounted in a suitable manner in the flared ends of the tubular members 9, 10 and in the end wall 163 of the air distribution box 2.
  • Each spindle 161 carries a lever 164 adjacent the inside surface of the end wall 163, the free end of which is pivotally connected to a ring 165 so that the levers 1 64 are coupled in parallel relationship to one another.
  • the top spindle 161 extends through the end wall 163 and carries a lever 166 on the outer end.
  • the free end 167 of this lever 166 bears resiliently against the outer surface of the end wall 163 while the surface of the end wall 163 is formed with a number of radially disposed notches (not shown) in the pivoting range of the lever 166 so that the end 167 thereof can engage the notches successively.
  • all the vanes 162 are displaced in the same direction and by the same amount by pivoting the lever 166 about the axis of the respective spindle 161.
  • the total rate of flow to the burner and the distribution of the air flow through the two annular ducts 40, 50 is adjusted in dependence on the load by axial displacement of the sleeve 15. If any humming or whistling of the burner then occurs, the position of the vanes 162 is altered by actuation of the lever 166 so that the direction of the air entering the outer annular duct 40 is changed. This will produce very little change in the total flow of air to the burner l or in the distribution of the air between the two annular ducts 40, 50, but the resonance phenomena which produce humming or whistling can be eliminated by this small change of direction.
  • the construction is such that the maximum change in direction that can be produced by the vanes 162, compared with the direction in which flow would occur if the vanes 162 were absent, is such that the change in the magnitude of the tangential velocity component at the outlet of the swirl means 11 is less than percent.
  • the spindle 161 can be adjusted directly from a load controller (not shown), for example, by appropriately constructed cam discs.
  • an adjustable grid or cascade (not shown) can be provided at the entrance of the duct 3 into the air distribution box 2 so that the direction of air flow for combustion to the two annular ducts can be changed simultaneously.
  • vibration-measuring probe in the distribution box 2 which is capable of producing a signal corresponding to a measured vibration so that the signal produced by the probe can be used to adjust the means controlling the direction of air flow to one or to both annular ducts via an automatic control unit.
  • a muffle burner having a central means for supplying fuel, means for supplying combustion air including at least two annular ducts surrounding said central means, means in each duct for imparting twist to the air flowing through each said duct to cause the air discharged from said ducts to have a tangential velocity component; direction changing means for adjustably changing the direction of the air flowing to at least one of said twist imparting, and damper means upstream of said direction changing means for controlling the flow of air to the duct associated with said direction changing means while not obstructing the flow of air to the other of said ducts means.
  • said direction changing means includes a plurality of circumferentially distributed vanes adjacent an inlet of the outermost of said annular ducts and means for adjustin g said vanes relative to said outermost duct.
  • said means for adjusting said vanes includes a spindle connected to each vane to pivot said respective vane in said inlet, a ring connected in common to each said spindle to rotate said spindles in unison and a control lever connected to one of said spindles at a position remote from said outermost duct to rotate said one spindle to adjust said vane thereon relative to said outermost duct.
  • damper means is a sleeve axially displaceably mounted over said ducts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Exhaust Silencers (AREA)
US00146978A 1970-05-29 1971-05-26 Resonance control for a muffle burner Expired - Lifetime US3723049A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH805670A CH524102A (de) 1968-11-27 1970-05-29 Wirbel-Muffelbrenner mit einer zentralen Öl- und/oder Gaszuführung

Publications (1)

Publication Number Publication Date
US3723049A true US3723049A (en) 1973-03-27

Family

ID=4334451

Family Applications (1)

Application Number Title Priority Date Filing Date
US00146978A Expired - Lifetime US3723049A (en) 1970-05-29 1971-05-26 Resonance control for a muffle burner

Country Status (7)

Country Link
US (1) US3723049A (xx)
BE (1) BE767457R (xx)
CA (1) CA934287A (xx)
DE (1) DE2028546C3 (xx)
ES (1) ES391590A2 (xx)
GB (1) GB1282070A (xx)
IT (1) IT982342B (xx)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050879A (en) * 1974-11-18 1977-09-27 Mitsubishi Jukogyo Kabushiki Kaisha Fuel combustion apparatus
US4089637A (en) * 1977-05-20 1978-05-16 Combustion Engineering, Inc. Control of air flow in a burner for a tangentially fired boiler
US4155701A (en) * 1977-09-26 1979-05-22 The Trane Company Variable capacity burner assembly
US4559009A (en) * 1982-08-06 1985-12-17 Hauck Manufacturing Company Aggregate dryer burner
US4606190A (en) * 1982-07-22 1986-08-19 United Technologies Corporation Variable area inlet guide vanes
US4825641A (en) * 1986-07-03 1989-05-02 Societe Nationale D'etude Et De Construction De Moteurs D'aviation (Snecma) Control mechanism for injector diaphragms
US5472340A (en) * 1994-04-08 1995-12-05 Lynch; Greg C. Flare igniter
US5649819A (en) * 1995-05-25 1997-07-22 Gordon-Piatt Energy Group, Inc. Low NOx burner having an improved register
DE10054132C1 (de) * 2000-10-31 2002-04-04 Viessmann Werke Kg Brennerbestückbarer Heizkesselverschluß
US20130164697A1 (en) * 2011-12-27 2013-06-27 Rinnai Corporation Combustion Apparatus
US20140041559A1 (en) * 2011-01-28 2014-02-13 Osaka Gas Co., Ltd. Furnace-Heating Combustion Apparatus
US8985999B2 (en) 2013-01-18 2015-03-24 Trane International Inc. Fuel/air furnace mixer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4464314A (en) * 1980-01-02 1984-08-07 Surovikin Vitaly F Aerodynamic apparatus for mixing components of a fuel mixture

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1740985A (en) * 1927-02-10 1929-12-24 Foster Wheeler Corp Air-mixing burner
US1870026A (en) * 1927-09-06 1932-08-02 Int Comb Eng Corp Pulverized fuel burner
US2271587A (en) * 1940-06-26 1942-02-03 Todd Comb Equipment Inc Air register
US2869625A (en) * 1954-03-18 1959-01-20 Riley Stoker Corp Register
US3391981A (en) * 1966-06-13 1968-07-09 Coen Company Forced air draft burner construction for combustible gases
US3612737A (en) * 1968-11-27 1971-10-12 Sulzer Ag Turbulence muffle burner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1740985A (en) * 1927-02-10 1929-12-24 Foster Wheeler Corp Air-mixing burner
US1870026A (en) * 1927-09-06 1932-08-02 Int Comb Eng Corp Pulverized fuel burner
US2271587A (en) * 1940-06-26 1942-02-03 Todd Comb Equipment Inc Air register
US2869625A (en) * 1954-03-18 1959-01-20 Riley Stoker Corp Register
US3391981A (en) * 1966-06-13 1968-07-09 Coen Company Forced air draft burner construction for combustible gases
US3612737A (en) * 1968-11-27 1971-10-12 Sulzer Ag Turbulence muffle burner

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050879A (en) * 1974-11-18 1977-09-27 Mitsubishi Jukogyo Kabushiki Kaisha Fuel combustion apparatus
US4089637A (en) * 1977-05-20 1978-05-16 Combustion Engineering, Inc. Control of air flow in a burner for a tangentially fired boiler
US4155701A (en) * 1977-09-26 1979-05-22 The Trane Company Variable capacity burner assembly
US4606190A (en) * 1982-07-22 1986-08-19 United Technologies Corporation Variable area inlet guide vanes
US4559009A (en) * 1982-08-06 1985-12-17 Hauck Manufacturing Company Aggregate dryer burner
US4825641A (en) * 1986-07-03 1989-05-02 Societe Nationale D'etude Et De Construction De Moteurs D'aviation (Snecma) Control mechanism for injector diaphragms
US5472340A (en) * 1994-04-08 1995-12-05 Lynch; Greg C. Flare igniter
US5649819A (en) * 1995-05-25 1997-07-22 Gordon-Piatt Energy Group, Inc. Low NOx burner having an improved register
DE10054132C1 (de) * 2000-10-31 2002-04-04 Viessmann Werke Kg Brennerbestückbarer Heizkesselverschluß
US20140041559A1 (en) * 2011-01-28 2014-02-13 Osaka Gas Co., Ltd. Furnace-Heating Combustion Apparatus
US9677760B2 (en) * 2011-01-28 2017-06-13 Osaka Gas Co., Ltd. Furnace heating combustion apparatus
US20130164697A1 (en) * 2011-12-27 2013-06-27 Rinnai Corporation Combustion Apparatus
US9127839B2 (en) * 2011-12-27 2015-09-08 Rinnai Corporation Combustion apparatus
US8985999B2 (en) 2013-01-18 2015-03-24 Trane International Inc. Fuel/air furnace mixer

Also Published As

Publication number Publication date
DE2028546C3 (de) 1979-12-13
GB1282070A (en) 1972-07-19
IT982342B (it) 1974-10-21
DE2028546A1 (de) 1971-12-09
DE2028546B2 (de) 1979-03-08
BE767457R (fr) 1971-11-22
ES391590A2 (es) 1973-07-16
CA934287A (en) 1973-09-25

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