US3840320A - Flarestack combustion method - Google Patents

Flarestack combustion method Download PDF

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Publication number
US3840320A
US3840320A US00245369A US24536972A US3840320A US 3840320 A US3840320 A US 3840320A US 00245369 A US00245369 A US 00245369A US 24536972 A US24536972 A US 24536972A US 3840320 A US3840320 A US 3840320A
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US
United States
Prior art keywords
steam
stream
low pressure
flow
fuel gases
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
US00245369A
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English (en)
Inventor
D Desty
C Young
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Individual
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Individual
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Filing date
Publication date
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Publication of US3840320A publication Critical patent/US3840320A/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
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/08—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases using flares, e.g. in stacks
    • F23G7/085—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases using flares, e.g. in stacks in stacks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/08—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases using flares, e.g. in stacks

Definitions

  • This invention relates to a burner for disposing of waste combustible gas, and in particular it relates to the disposal of refinery waste gases.
  • Refinery and chemical plant operation often requires that a vessel is vented through pressure relief valves into a vent system running at near atmospheric pressure. Gas from this low pressure vent system is then disposed of by flaring from an elevated stack so as to aid the dispersion of any oxides of sulphur that may be formed during combustion.
  • a burner for disposing of low pressure fuel gas comprises a fuel gas inlet adapted to supply fuel gas (originally at low pressure) to a combustion zone, a director body at one end of which the fuel inlet is situated, the director body having .an external director surface and an internal passage for conveying fuel gas to the fuel gas inlet, the burner also comprising a steam inlet adapted to direct a stream of steam (originally at high pressure) over the director surface towards the fuel gas inlet the director surface being curved so as to initiate the flow of steam and air towards the fuel gas inlet.
  • the steam is supplied at a pressure in the range 70 kN/m to 300 kN/m It is known that a stream of gas will stick to a suitably shaped surface and a curved surface can deflect a stream of gas and thereby produce a low pressure zone.
  • the initial portion of the director surface is shaped so as to deflect the flow of steam and to produce a low pressure zone into which atmospheric air flows.
  • the burner comprises a director tube the outer surface of which is the director surface and the bore of which is a fuel gas channel which terminates at the fuel inlet.
  • the initial portion of the director surface is the surface of revolution formed by the rotation of a quadrant of a circle about the longitudinal axis of the director body, the curved section of the quadrant being tangential to the steam inlet.
  • Flame stabilisation can be improved by fitting a wind deflector.
  • a suitable deflector is disclosed in British Pat. No. 795,664.
  • a method for disposing of low pressure fuel gases comprises inducing steam (originally at high pressure) to flow over a director surface which is shaped so as to cause the steam flow to initiate flow of steam and air towards a fuel inlet which supplies fuel gas (originally at low pressure) into the flow of steam and air.
  • the burner shown comprises a director surface 10 which forms the outer surface of a director tube which has a steam inlet 11 for stream at its lower end and a secondary inlet 12 for fuel gas at its upper end. During use the steam flows over the director surface 10 and this flow initiates flow of steam and air towards the secondary inlet 12.
  • the director tube has a flat base 13 and the steam inlet 11 takes the form of a circular slot formed between the wall of the steam line 14 and the flat base 13 so that the steam leaves the steam inlet 11 as a thin horizontal sheet.
  • the director surface 10 comprises two portions, namely adeflector portion 15 which turns the direction of flow of the steam from the horizontal to vertical, and the continuation of the portion 16 which maintains the flow of steam and air between the deflector portion 15 and the fuel gas inlet 12.
  • the purpose of this curved continuation 16 is to allow a suitable separation between the steam inlet ll and the secondary inlet 12, while maintaining the skin effect up to the secondary inlet 12.
  • the shape of the deflector portion 15 is most conveniently specified as the surface of revolution formed by the rotation of a quadrant of a circle about the 1ongitu dinal axis of the director body, the curved section of the quadrant being tangential to the steam inlet; as shown in the drawing the distance between the axis of rotation and the centre of the quadrant is several times the radius of the quadrant.
  • the continuation portion 16 is again a surface of revolution, but of an arc of larger radius than that of the quadrant, thus giving rise to'a tapered portion.
  • the fuel is conveyed to the secondary inlet by the fuel gas line 17 (which forms an annular configuration with the steam manifold 14) and fuel which issues from the fuel line 17 meets the converging steam of steam and air moving over surface 16.
  • a method for disposing of low pressure fuel gases comprising the steps of:
  • a deflector surface which comprises a surface of revolution formed by the rotation of a quadrant of a circle and an inwardly curved continuation about the axis of the direction of flow of said low pressure fuel gases

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Incineration Of Waste (AREA)
US00245369A 1971-04-29 1972-04-19 Flarestack combustion method Expired - Lifetime US3840320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1206871A GB1381867A (en) 1971-04-29 1971-04-29 Flarestacks

Publications (1)

Publication Number Publication Date
US3840320A true US3840320A (en) 1974-10-08

Family

ID=9997860

Family Applications (1)

Application Number Title Priority Date Filing Date
US00245369A Expired - Lifetime US3840320A (en) 1971-04-29 1972-04-19 Flarestack combustion method

Country Status (8)

Country Link
US (1) US3840320A (enExample)
JP (1) JPS5114296B1 (enExample)
BE (1) BE782843A (enExample)
CA (1) CA946728A (enExample)
FR (1) FR2136525A5 (enExample)
GB (1) GB1381867A (enExample)
IT (1) IT960264B (enExample)
NL (1) NL166774C (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019852A (en) * 1974-10-23 1977-04-26 Basf Aktiengesellschaft Quiet and smokeless flaring of off-gases containing hydrocarbons
US4036580A (en) * 1976-06-04 1977-07-19 John Zink Company Turbine-driven air-powered flare
FR2385984A1 (fr) * 1977-03-28 1978-10-27 Zink Co John Bruleur de combustible gazeux
US4464110A (en) * 1980-12-10 1984-08-07 The British Petroleum Company Limited Flare using a Coanda director surface
US4486167A (en) * 1980-12-10 1984-12-04 The British Petroleum Company Limited Flare having noise attenuation
US5096679A (en) * 1988-04-01 1992-03-17 The Standard Oil Company System to mitigate the effect of an environmental release of a contaminant gas
US5145651A (en) * 1988-04-01 1992-09-08 The Standard Oil Company System to mitigate the effect of an environmental release of a contaminant gas
US20040110105A1 (en) * 2002-12-04 2004-06-10 Rajewski Robert C. Flare stack operating on coanda principle
CN101069040B (zh) * 2004-12-08 2011-11-23 Lpp燃料有限公司 用于调节液体燃料的方法和装置
US20150211735A1 (en) * 2012-08-16 2015-07-30 Schlumberger Technology Corporation Shrouded-coanda multiphase burner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1593391A (en) 1977-01-28 1981-07-15 British Petroleum Co Flare

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019852A (en) * 1974-10-23 1977-04-26 Basf Aktiengesellschaft Quiet and smokeless flaring of off-gases containing hydrocarbons
US4036580A (en) * 1976-06-04 1977-07-19 John Zink Company Turbine-driven air-powered flare
FR2385984A1 (fr) * 1977-03-28 1978-10-27 Zink Co John Bruleur de combustible gazeux
US4217088A (en) * 1977-03-28 1980-08-12 John Zink Company Burner for very low pressure gases
US4464110A (en) * 1980-12-10 1984-08-07 The British Petroleum Company Limited Flare using a Coanda director surface
US4486167A (en) * 1980-12-10 1984-12-04 The British Petroleum Company Limited Flare having noise attenuation
US5096679A (en) * 1988-04-01 1992-03-17 The Standard Oil Company System to mitigate the effect of an environmental release of a contaminant gas
US5145651A (en) * 1988-04-01 1992-09-08 The Standard Oil Company System to mitigate the effect of an environmental release of a contaminant gas
US20040110105A1 (en) * 2002-12-04 2004-06-10 Rajewski Robert C. Flare stack operating on coanda principle
US6960075B2 (en) 2002-12-04 2005-11-01 Rajewski Robert C Flare stack operating on Coanda principle
CN101069040B (zh) * 2004-12-08 2011-11-23 Lpp燃料有限公司 用于调节液体燃料的方法和装置
US20150211735A1 (en) * 2012-08-16 2015-07-30 Schlumberger Technology Corporation Shrouded-coanda multiphase burner

Also Published As

Publication number Publication date
GB1381867A (en) 1975-01-29
DE2220636A1 (de) 1972-11-16
FR2136525A5 (enExample) 1972-12-22
IT960264B (it) 1973-11-20
DE2220636B2 (de) 1976-12-09
NL7205703A (enExample) 1972-10-31
NL166774C (nl) 1981-09-15
BE782843A (fr) 1972-10-30
CA946728A (en) 1974-05-07
JPS5114296B1 (enExample) 1976-05-08
NL166774B (nl) 1981-04-15

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