US3612737A - Turbulence muffle burner - Google Patents

Turbulence muffle burner Download PDF

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Publication number
US3612737A
US3612737A US880683A US3612737DA US3612737A US 3612737 A US3612737 A US 3612737A US 880683 A US880683 A US 880683A US 3612737D A US3612737D A US 3612737DA US 3612737 A US3612737 A US 3612737A
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US
United States
Prior art keywords
muffle
turbulence
duct
burner
air
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
US880683A
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English (en)
Inventor
Harendra Nath Sharan
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
Original Assignee
Sulzer AG
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 claimed from CH1764668A external-priority patent/CH499748A/de
Application filed by Sulzer AG filed Critical Sulzer AG
Application granted granted Critical
Publication of US3612737A publication Critical patent/US3612737A/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
    • 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
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid

Definitions

  • This invention relates to a turbulence muffle burner. More particularly, this invention relates to a turbulence muffle burner with a central oil or gas supply means.
  • Burners have been known which have been adjoined to a refractory muffle and have been constructed with a central means for supplying oil and/or gas and a means for supplying combustion air in which means are disposed to impart twist to the air flowing therethrough.
  • Such burners have been employed, for example, for heating air intended for blast furnaces, for underwater combustion, for refuse combustion or for direct heating, for example, of induction furnaces during heating up.
  • the thermal loadings referred to the muffle volume as well as the thermal loadings referred to the mufile cross section have been relatively small. As a result of such small loadings, these burners cannot be employed efficiently for steam-raising plants.
  • turbulence combustion chambers have also been known which are used in conjunction with steamraising plants and in which coal dust is burnt.
  • the combustion space has been surrounded by cooling tubes provided with a stamping mass.
  • the stamping mass on the one hand, enables the combustion temperature to be raised thus accelerating the combustion and, on the other hand, avoids quenching of the liquid slag when the slag touches the wall of the combustion chamber so that the slag can flow away.
  • these known turbulence combustion chambers have also been unsuitable for achieving very high thermal loadings.
  • the invention provides a turbulence muffle burner in which an air supply means mounted about a burner is divided into at least two annular ducts, for example, by a tubular member, each duct being provided with means for imparting twist such that over the entire load range, the velocity of the air leaving the annular duct nearest to the center is greater than the velocity of the air leaving the annular duct disposed distally relative to the center.
  • the means for imparting twist are so constructed that the tangential velocity component of the air discharged from the annular duct nearest to the center is greater than the tangential velocity component of the air discharged from the annular duct disposed distally relative to the center.
  • the dimensions of the turbulence muffle burner of the invention are substantially smaller than those of known burners. It is further possible with the burner to produce within the muffle a strong turbulence, similar to a potential turbulence, associated with an axial backflow formed along the longitudinal axis of the muffle. This results in an intensive and rapid mixing of fuel and combustion air so that the high temperature of the uncooled mufi'le wall produces a high combustion rate and therefore a high output density.
  • FIGURE illustrates a horizontal section through a turbulence muffle burner according to the invention.
  • the burner 1 has a cylindrical airdistribution box or chamber 2 tangentially adjoining a duct 3 through which combustion air is supplied to the burner l.
  • a burner lance 4 supplied with fuel such as oil and/or gas via a pipeline 5, is disposed in the center of the distributor box 2 and has an end constructed as an atomizer nozzle 6.
  • the lance 4 is mounted by means of a flange 7 on the end wall of the distributor box 2 and is guided in a bush 8 in the zone of the atomizer nozzle 6.
  • the burner lance 4 is coaxially surrounded in the zone of the atomizer nozzle 6 by a tubular member 9 having an air entry end expanded in flared manner.
  • the tubular member 9 in turn is surrounded by a tube 10 mounted via a conical wall 13 in the air-distribution box 2.
  • One annular duct 40, 50 respectively is therefore formed between the tube 10 and the tubular member 9 on the one hand and between the tubular member 9 and the bush 8 on the other hand.
  • Means ll, 12 respectively are provided in each of the two annular ducts 40, 50 for imparting twist to the air flowing therethrough.
  • these means ll, 12 are formed by plates which are welded to the bush 8 and the tubular member 9 and to the tubular member 9 and the tube 10, respectively and formed into helical surfaces.
  • the means 1 1, 12 are so constructed with respect to the ducts 40, 50 such that the tangential velocity component of the air discharged from the innermost annular duct 50 is greater than the tangential velocity component of the air discharged from the outermost annular duct 40.
  • the system thus formed for supplying combustion air is adjoined by a muffle 18 of ceramic material which initially opens in flared manner starting from the tube 10 and then continues in cylindrical section.
  • the muffle 18 is guided with radial clearance in a plate jacket 16 joined to the conical wall 13.
  • the end of the jacket 16 (disposed on the right in the drawing) is provided with a flange 17 by means of which the burner l is mounted on the wall 19 of the steam generator (not shown in detail).
  • the wall 19 of the steam generator is provided with an aperture having the external diameter of the mufl'le 18 so that the flame gases discharged from the burner 1 can flow without obstruction into the steam generator so as to give up heat to tubes 20 through which working medium flows.
  • the conical wall 13 within the distribution box 2 is stiffened by radial ribs 14 which also serve for securing the tube 10 in place.
  • the tube 10 is also surrounded by a sleeve 15 which is adjustable in the axial direction and by means of which it is possible to vary the entry flow cross section of the annular duct 40 disposed distally relative to the center of the burner to enable the air supply to the burner l to be adapted to the varying load of the steam generator.
  • the combustion air is discharged from the pipeline 3 at moderate velocity and tangentially into the distribution chamber 2 and an approximately constant proportion of the air flows into the annular duct 50 surrounded by the tubular member 9.
  • the twist plates l1 impart twist to this proportion of air whereupon the air is discharged in turbulence form from the duct 50 and mixes intensively with the fuel oil and/or gas atomized in the atomizer nozzle 6.
  • the remaining air supplied to the distribution chamber 2 flows into the annular duct 40 bounded by the tubular member 9 and the tube 10, where twist is also imparted on the air by the plates 12.
  • the twist of the air in the annular duct 40 is in the same sense as the twist of the air in the annular duct 50 which is nearest to the burner axis or center.
  • the flared construction of the tubular member 9 functions as a means for maintaining the velocity of the air discharged from the innermost duct 50 substantially constant while also ensuring that the velocity of the air discharged from the outermost annular duct 40 is always somewhat less than the velocity of the air discharged from the innermost annular duct 50, even if the adjustable sleeve 15 is displaced completely to the right as viewed in the drawing so that the entry cross section of the outermost annular duct 40 is the largest.
  • a difference occurs between the tangential velocity components of the air discharged from the innermost annular duct 50 and the air discharged from the outermost annular duct 40 in such a manner that the component of the innermost airflow is greater than that of the outermost airflow.
  • a potential turbulence velocity distribution is produced at the entry of the muffle 18 resulting in a gas backflow in the center of the muffle as indicated in diagrammatic form by the arrows in the drawing.
  • the direction of these arrows represents, in the most general form, the axial components of different streamlines, as turned back into the drawing plane.
  • the actual flow is characterized by a twist superimposed on the drawn lines and resulting in a quasi winding up of the flame within the mufile so that combustion is completed within the short muffle volume. This special guiding of the combustion air ensures an intensification of the combustion process.
  • two tubular members for subdividing the air supply may be provided in place of one tubular member 9, so that three annular ducts are formed.
  • the invention thus provides a turbulence muffle burner which can be of substantially small size while of substantially large output.
  • the diameter of the outermost annular duct 40 can amount to 0.3 to 0.6 times the internal diameter of the muffle 18 while the length of the muffle l8 amounts to 0.5 to 2 times the internal diameter of the muffle 18.
  • the exit cross sections of the ducts 40, 50 are of approximately equal size.
  • a turbulence muffle burner comprising central means for supplying fuel
  • said means for supplying combustion air surrounding said central means said means including at least one tubular member about said central means dividing said means into at least two annular ducts to cause the velocity of the air discharged from the innermost of said ducts to be greater than the velocity of the air discharged from the outermost of said ducts;
  • each said duct for imparting twist to the air flowing through each said duct to cause the tangential velocity component of the air discharged from said innermost duct to be greater than the tangential velocity component of the air discharged from said outermost duct over the entire load range;
  • a refractory muffle adjoining said ducts to receive the twisted air flows.
  • a turbulence muffle burner as set forth in claim 1 further comprising means for maintaining the velocity of the air discharged from said innermost duct substantially constant.
  • a turbulence muffle burner as set forth in claim 1 further comprising means for varying the flow cross section of said outermost duct.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
US880683A 1968-11-27 1969-11-28 Turbulence muffle burner Expired - Lifetime US3612737A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1764668A CH499748A (de) 1968-11-27 1968-11-27 Wirbel-Muffelbrenner mit einer zentralen Öl- und/oder Gaszuführung

Publications (1)

Publication Number Publication Date
US3612737A true US3612737A (en) 1971-10-12

Family

ID=4427006

Family Applications (1)

Application Number Title Priority Date Filing Date
US880683A Expired - Lifetime US3612737A (en) 1968-11-27 1969-11-28 Turbulence muffle burner

Country Status (9)

Country Link
US (1) US3612737A (de)
AT (1) AT301733B (de)
DE (1) DE6945601U (de)
DK (1) DK132540C (de)
ES (1) ES373703A1 (de)
FR (1) FR2024393A1 (de)
GB (1) GB1250560A (de)
YU (1) YU32209B (de)
ZA (1) ZA698149B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723049A (en) * 1970-05-29 1973-03-27 Sulzer Ag Resonance control for a muffle burner
US3758263A (en) * 1970-12-16 1973-09-11 Heurtey Sa Fluid-fuel burners
US3866413A (en) * 1973-01-22 1975-02-18 Parker Hannifin Corp Air blast fuel atomizer
US3905751A (en) * 1974-03-21 1975-09-16 Midland Ross Corp Gas burner
US3915387A (en) * 1973-06-28 1975-10-28 Snecma Fuel injection devices
US4060369A (en) * 1974-10-03 1977-11-29 Schoute Bernardus A Burner for the combustion of hydrocarbonates
US4073134A (en) * 1974-04-03 1978-02-14 Bbc Brown Boveri & Company, Limited Gas turbine combustor fed by a plurality of primary combustion chambers
US5192204A (en) * 1992-03-20 1993-03-09 Cedarapids, Inc. Dual atomizing multifuel burner
US5415539A (en) * 1994-02-09 1995-05-16 Cedarapids, Inc. Burner with dispersing fuel intake
US5454712A (en) * 1993-09-15 1995-10-03 The Boc Group, Inc. Air-oxy-fuel burner method and apparatus
US6036480A (en) * 1996-02-16 2000-03-14 Aos Holding Company Combustion burner for a water heater
US20070217983A1 (en) * 2004-08-04 2007-09-20 Boc Group Plc, The Gas Abatement
US8985999B2 (en) 2013-01-18 2015-03-24 Trane International Inc. Fuel/air furnace mixer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904349A (en) * 1974-05-22 1975-09-09 Babcock & Wilcox Co Fuel burner
US4243375A (en) * 1978-06-08 1981-01-06 John Zink Company Gas or liquid fuel burner with air register control of tangential/axial combustion air movement
DE19738054C2 (de) * 1997-09-01 2002-06-20 Heinrich Koehne Verfahren und Vorrichtung zur Veränderung der Drallzahl der Verbrennungsluft eines Brenners während des Betriebes
DE10164217B4 (de) * 2001-12-31 2004-08-05 Jochen Schanze Brenner für eine Gebäudeheizanlage

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723049A (en) * 1970-05-29 1973-03-27 Sulzer Ag Resonance control for a muffle burner
US3758263A (en) * 1970-12-16 1973-09-11 Heurtey Sa Fluid-fuel burners
US3866413A (en) * 1973-01-22 1975-02-18 Parker Hannifin Corp Air blast fuel atomizer
US3915387A (en) * 1973-06-28 1975-10-28 Snecma Fuel injection devices
US3905751A (en) * 1974-03-21 1975-09-16 Midland Ross Corp Gas burner
US4073134A (en) * 1974-04-03 1978-02-14 Bbc Brown Boveri & Company, Limited Gas turbine combustor fed by a plurality of primary combustion chambers
US4060369A (en) * 1974-10-03 1977-11-29 Schoute Bernardus A Burner for the combustion of hydrocarbonates
US5192204A (en) * 1992-03-20 1993-03-09 Cedarapids, Inc. Dual atomizing multifuel burner
US5454712A (en) * 1993-09-15 1995-10-03 The Boc Group, Inc. Air-oxy-fuel burner method and apparatus
US5415539A (en) * 1994-02-09 1995-05-16 Cedarapids, Inc. Burner with dispersing fuel intake
US6036480A (en) * 1996-02-16 2000-03-14 Aos Holding Company Combustion burner for a water heater
US20070217983A1 (en) * 2004-08-04 2007-09-20 Boc Group Plc, The Gas Abatement
US7494633B2 (en) * 2004-08-04 2009-02-24 Edwards Limited Gas abatement
US8985999B2 (en) 2013-01-18 2015-03-24 Trane International Inc. Fuel/air furnace mixer

Also Published As

Publication number Publication date
ES373703A1 (es) 1972-02-01
YU293469A (en) 1973-12-31
YU32209B (en) 1974-06-30
DE6945601U (de) 1970-08-27
AT301733B (de) 1972-09-11
ZA698149B (en) 1971-07-28
DK132540C (da) 1976-05-24
FR2024393A1 (de) 1970-08-28
GB1250560A (de) 1971-10-20
DK132540B (da) 1975-12-22

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