WO2006010693A1 - Torche de brulage a combustion de flamme interne - Google Patents

Torche de brulage a combustion de flamme interne Download PDF

Info

Publication number
WO2006010693A1
WO2006010693A1 PCT/EP2005/053130 EP2005053130W WO2006010693A1 WO 2006010693 A1 WO2006010693 A1 WO 2006010693A1 EP 2005053130 W EP2005053130 W EP 2005053130W WO 2006010693 A1 WO2006010693 A1 WO 2006010693A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
flare stack
outer tube
exhaust
burner assembly
Prior art date
Application number
PCT/EP2005/053130
Other languages
English (en)
Inventor
Geert Dumortier
Hans Verbauwhede
Marcel Corteville
Dirk Ten Hoeve
Original Assignee
Nv Bekaert Sa
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 Nv Bekaert Sa filed Critical Nv Bekaert Sa
Publication of WO2006010693A1 publication Critical patent/WO2006010693A1/fr

Links

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

Definitions

  • the present invention relates to flare stacks and more in particular to double walled flare stacks and ground flare stacks for flaring combustible fluids using enclosed flame combustion.
  • Flare stacks are widely used for combustion of combustible fluids such as waist gasses or liquids or process gasses at various chemical and petrochemical applications.
  • flare stacks which combust fluids by means of a flame, being a burner assembly mounted on top of a high stack.
  • the combustion is done using open flames, possibly assisted by steam or compressed air for creating turbulent gas streams.
  • Such combustion may cause not only incomplete combustion, but also may cause thermal nuisance, noise and/or light pollution.
  • An example of such flare stack is described in US4468193.
  • enclosed combustion may be used for flaring such waist or process fluids.
  • NL1011009 describes such enclosed burner assembly for combustion of combustible gasses.
  • JP53-98530 describes a flare stack using enclosed combustion of fluids.
  • a flare stack for enclosed flame combustion of combustible fluids as subject of the invention comprises a burner assembly and a double walled exhaust tube having an upper end and a lower end.
  • the double walled exhaust tube comprises an inner tube and an outer tube and means at the lower end of the exhaust tube to allow air flowing between the inner and the outer tube from the lower end to the upper end of the exhaust tube.
  • the burner assembly is mounted in the inner tube for enclosed flame combustion of the combustible fluids inside the inner tube and discharging combusted fluids by means of an exhaust opening from the inner tube at the upper end.
  • a flare stack as subject of the invention is characterized in that at the upper end, the * outer tube is extending beyond the exhaust opening of the inner tube of the double walled exhaust tube.
  • the outer tube is so-to-say higher than the inner tube.
  • the exhaust gasses being discharged by the exhaust opening of the inner tube, creating an under pressure at the space between the outer and inner tube exhaust opening of the inner tube.
  • This under pressure causes a higher amount of cooling air drafted between the inner and outer tube from the lower end of the double walled exhaust tube to the upper end.
  • This amount of cooling air cools the inner tube to a larger extend, as well as the outer tube, and so prevents the outer tube to increase its temperature, which on its turn limits the thermal radiation from the outer tube to the environment in the direct neighborhood of the flare stack. It was found that preferably the outer tube extends at least 100mm beyond the exhaust opening of the inner tube.
  • the length of the extension of the outer tube is however limited to the dimensions and performance of the burner assembly, this is, the length may not cause a pressure drop over the exhaust gasses to be overcome, which cannot be provided by the burner assembly. More preferred, the length of the outer tube extending beyond the exhaust opening of the inner tube is in between 100mm and 2000mm, most preferred between 100mm and 1200mm.
  • the diameter of the inner and outer tube is depending on the burner assembly and more in particular to the maximum load to be foreseen for the burner assembly. The diameter of the inner tube may e.g. range between 120 and 1000mm.
  • 'tube' is not to be understood as limited to circular shaped concentric or coaxial shapes.
  • double walled tube is to be understood as comprising two distinct tubular shaped objects, of which one object (the inner object) is present substantially encompassed by the other object (the outer object).
  • burner assembly is mounted in the double walled tube in such a way that at the lower side of the double walled tube, the lower end of the outer tube end is located below the flame front on the burner assembly.
  • enclosed flame combustion is to be understood that the flames obtained by combustion of the combustible gasses when the flare stack is run on maximum capacity, does substantially not extend beyond the exhaust opening of the inner tube.
  • means are present to allow cooling air to flow between the two tubes from the lower to the upper end of the tube.
  • Such means may be e.g. openings in the outer tube.
  • the outer tube may be mounted in such a way that the radial open space between the inner and outer tube is freely accessible for cold air.
  • the minimum distance between the inner and the outer tube is at least 12mm, more preferred, the distance is between 15mm and 75mm, such as between 20mm and
  • burner assembly is to be understood as any type of burner suitable to combust the combustible fluids, being mounted at the lower end of the exhaust tube in order to combust the combustible fluids inside the inner tube.
  • the burner assembly is a premix burner assembly, which may be mounted in such a way that it closes the inner tube at its lower end completely.
  • the dimensions of the burner assembly are determined by the load range, this is the amount of combustible gas the burner assembly is to be able to combust per time unit.
  • the diameter of the inner tube is dependent on the burner assembly dimensions.
  • the diameter of the inner tube may vary however over a large range, preferably between 100mm and 1500mm.
  • the length of the inner tube is determined by the height of the flame front which may be generated when the burner assembly is burning under its largest load. Usually, but not restrictively, the height of the inner tube extends at least 150mm above the burner assembly, this is above the combustion point of fluids being combusted by the burner assembly.
  • the inner tube may be foreseen of walls which are corrugated.
  • the outer tube is foreseen of additional openings, located near the exhaust opening of the inner tube.
  • additional openings is the reduction of noise which may occur when no such openings are present.
  • the openings in the outer tube are located at the location of the exhaust opening of the inner tube plus or minus 10 times the distance between the two tubes.
  • the openings are present in the outer tube at the location of the exhaust opening of the inner tube, discharging the combusted gasses at the inside of the outer tube.
  • the additional openings may e.g. be provided as circular perforations, but may as well be provided in many other shapes (e.g. elliptic slots or rectangular slots) or may be foreseen by using an outer tube, which is provided as two tubes, which two parts are spaced from each other at the location of the additional openings.
  • the additional openings represents al least 8% of the zone of the outer tube wall, said zone being bound by the highest and lowest point of the additional openings.
  • the additional openings represent between 10% and 30% of this zone.
  • FIGURE 1, FIGURE 2 and FIGURE 3 shows schematically some embodiments of flare stacks as subject of the invention. Description of the preferred embodiments of the invention.
  • the flare stack 100 comprises a burner assembly 101 and a double walled exhaust tube 110 having an upper end 111 and a lower end 112.
  • the double walled exhaust tube comprises an inner tube 120 and an outer tube 130 and means 140 at the lower end 112 of the exhaust tube 110 to allow air flowing between the inner and the outer tube from the lower end to the upper end of the exhaust tube as indicated with arrow 102.
  • the means 140 are provided by mounting the outer tube 130 to the inner tube 120 by means of some studs 141, in such a way that the lower end of the outer tube 130 is open for air to enter.
  • the outer tube 130 envelopes the burner assembly 101.
  • the means 140 to enter cooling air is provided below the burner assembly 101.
  • the burner assembly 101 is mounted in the inner tube 120 for combusting the combustible fluids inside the inner tube 110 and discharging combusted gasses by means of an exhaust opening 121 from the inner tube 120 at the upper end.
  • the outer tube 130 is extending beyond the exhaust opening 121 of the inner tube 120 of the double walled exhaust tubei 10.
  • the outer tube 130 is a stainless steel tube with circular cross section, having a diameter (132) of 250mm.
  • the inner tube 120 is a stainless steel tube with circular cross section, having a diameter (122) of 200mm.
  • the tubes are mounted coaxially, so the distance (123) between inner and outer tube is substantially identical and equal to 25mm.
  • the outer tube 130 has a length (134) of 600mm.
  • the inner tube has a length (124) of 485mm.
  • the lower ends of the inner tube 120 and outer tube 130 are coplanar.
  • the inner tube 120 is coupled to the combustible gas supply 150 comprising a fan 151, which takes combustible gas (indicated 152) via valve 153 and air (indicated 154), and discharges the combustible gas mixture (indicated 155) to the burner assembly 101.
  • the burner assembly 10I 1 comprising a circular metal fiber burner membrane with diameter (156) of 135mm, is mounted in the inner side of the inner tube 120, at a distance (157) of 310mm from the lower end of both inner and outer tube.
  • the burner assembly comprises a metal fiber burner membrane being a knitted fabric out of metal fibers, such as described in EP839221B1.
  • the shaved fibers may be obtained by coil shaving such as described in EP319959B1.
  • the alloy out of which the metal fibers are provided, is preferably a thermally resistant Iron- Chromium-Aluminum- alloy such as e.g. Fecralloy ® or Aluchrome®.
  • the an exhaust opening 121 from the inner tube 120 at the upper end is located on a distance (158) of 175mm above the burner assembly. Exhaust gasses (indicated 159) are discharged to the inner side of the outer tube 130 via this exhaust opening 121.
  • the outer tube 130 extends 115mm beyond the exhaust opening 121 of the inner tube 120.
  • the lower part of the inner tube this is the part between the combustible gas supply 150 and the burner assembly 101 is used as a mixing chamber 161.
  • the flame front 163 resulting from combustion of the combustible gasses is enveloped by the inner tube 120.
  • the additional openings 171 are located at the height of the exhaust opening 121 of the inner tube 120.
  • the openings as shown in FIGURE 1 are twenty-six circular perforations of the outer tube with diameter (173) of 10mm. This represents 10.7% of the zone 173 being bound by the highest and lowest point of the additional openings 171.
  • additional cold air may be drafted via these additional openings from the outside of the outer tube inwards the outer tube, as indicated with arrow 174. This additional cold air prevents the upper part of the outer tube to be heated by the thermal energy of the exhaust gasses being discharged by means of the exhaust opening from the inner tube.
  • the outer tube has a length of 1500mm, and is replacing the outer tube as the one described in FIGURE 1.
  • the outer tube extends 1015mm beyond the inner tube.
  • the flare stack 100 may be used to combust several gasses, varying from rich waist or process gasses from chemical or petrochemical plants, to relatively poor waist gasses from other sources.
  • the burner assembly and hence the flare stack is loaded with combustible gasses, generating during combustion less than 15OkW 1 more preferred less than 120 kW.
  • FIGURES 2, 3 and 4 show alternative burner assemblies which may be used for a flare stack as subject of the invention.
  • a combustible gas supply 250 as shown in FIGURE 2 may be used to combust gasses presented at high pressure (e.g. 6 bar).
  • Gasses (via gas duct indicated 201) may be provided to a ventury system 202, which draft primary combustion air (indicated 203) at specified ratio gas/air and present the premixed combustible gas to the burner assembly and flare stack, identical as for the flare stack 100 shown in FIGURE 1.
  • additional primary air 204 may be provided by means of a fan 205.
  • a combustible gas supply 350 as shown in FIGURE 3 may be used.
  • Gasses via gas duct as indicated 301) may be provided to a mixing chamber 304 by means of an injector 303, located at the smallest diameter of a conical mixing chamber 304.
  • Primary air (indicated 305) on a predetermined ratio is provided to the mixing chamber 304 by means of a fan 306.
  • the amount of primary air is coupled to the gas volume by means of a temperature sensor 307, measuring the temperature of the exhaust gasses.
  • the measures temperature is compared with a set-value by a control unit 308, which may set the fan speed in order to obtain a higher or lower exhaust gas temperature.
  • the mixing chamber 304 present the premixed combustible gas to the burner assembly and flare stack, identical as for the flare stack 100 shown in FIGURE 1.
  • a burner assembly for combustion of liquid combustible fluids may be provided as well.
  • Such burner assembly may be mounted in the inner side of the inner tube in substantially identical way.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

L'invention concerne une torche de brûlage servant à brûler des fluides combustibles. Cette torche comprend un ensemble brûleur et un tube d'évacuation à double paroi comportant une extrémité supérieure et une extrémité inférieure. Le tube d'évacuation à double paroi comprend un tube interne et un tube externe, ainsi qu'un moyen disposé au niveau de son extrémité inférieure, permettant l'écoulement de l'air entre le tube interne et le tube externe, de la partie inférieure à la partie supérieure du tube d'évacuation. L'ensemble brûleur est monté dans le tube interne afin de brûler les fluides combustibles à l'intérieur du tube interne, et d'évacuer les gaz brûlés par l'intermédiaire d'une ouverture d'évacuation, à partir du tube interne, au niveau de l'extrémité supérieure. La torche de brûlage selon l'invention se caractérise en ce que, au niveau de l'extrémité supérieure, le tube externe s'étend au-delà de l'ouverture d'évacuation du tube interne du tube d'évacuation à double paroi.
PCT/EP2005/053130 2004-07-26 2005-07-01 Torche de brulage a combustion de flamme interne WO2006010693A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP04103558 2004-07-26
EP04103558.5 2004-07-26
US59120804P 2004-07-27 2004-07-27
US60/591,208 2004-07-27

Publications (1)

Publication Number Publication Date
WO2006010693A1 true WO2006010693A1 (fr) 2006-02-02

Family

ID=35063189

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/053130 WO2006010693A1 (fr) 2004-07-26 2005-07-01 Torche de brulage a combustion de flamme interne

Country Status (1)

Country Link
WO (1) WO2006010693A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008055829A1 (fr) * 2006-11-08 2008-05-15 Nv Bekaert Sa Torche modulaire et procédé de brûlage à la torche de gaz résiduaire
WO2009129429A2 (fr) * 2008-04-18 2009-10-22 Moneyhun Equipment Sales & Service Co., Inc. Torchère pour dégagement gazeux
WO2011113631A1 (fr) 2010-03-15 2011-09-22 Solaronics S.A. Installation de séchage
EP2636951A1 (fr) 2012-03-07 2013-09-11 Flare Industries, LLC Appareil et procédé de brûlage à la torche de gaz résiduaire
WO2021030649A1 (fr) * 2019-08-14 2021-02-18 Zeeco, Inc. Appareil et procédé de torche assistée à faible consommation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398530A (en) * 1977-02-10 1978-08-29 Kajima Corp Grand flare stack
FR2448692A1 (fr) * 1979-02-08 1980-09-05 Lorraine Houilleres Dispositif d'allumage d'une torche a gaz
US4468193A (en) * 1983-03-03 1984-08-28 Mcgill Incorporated Staged hydrocarbon combustion system
WO2002086386A1 (fr) * 2001-04-18 2002-10-31 Aramco Services Company Procede et appareil de combustion pour torche de brulage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398530A (en) * 1977-02-10 1978-08-29 Kajima Corp Grand flare stack
FR2448692A1 (fr) * 1979-02-08 1980-09-05 Lorraine Houilleres Dispositif d'allumage d'une torche a gaz
US4468193A (en) * 1983-03-03 1984-08-28 Mcgill Incorporated Staged hydrocarbon combustion system
WO2002086386A1 (fr) * 2001-04-18 2002-10-31 Aramco Services Company Procede et appareil de combustion pour torche de brulage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0021, no. 28 (M - 037) 26 October 1978 (1978-10-26) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008055829A1 (fr) * 2006-11-08 2008-05-15 Nv Bekaert Sa Torche modulaire et procédé de brûlage à la torche de gaz résiduaire
US8282389B2 (en) 2006-11-08 2012-10-09 Nv Bekaert Sa Modular flare stack and method of flaring waste gas
WO2009129429A2 (fr) * 2008-04-18 2009-10-22 Moneyhun Equipment Sales & Service Co., Inc. Torchère pour dégagement gazeux
WO2009129429A3 (fr) * 2008-04-18 2010-02-18 Moneyhun Equipment Sales & Service Co., Inc. Torchère pour dégagement gazeux
US7811081B2 (en) 2008-04-18 2010-10-12 Moneyhun Equipment Sales & Service Off-gas flare
WO2011113631A1 (fr) 2010-03-15 2011-09-22 Solaronics S.A. Installation de séchage
US8881424B2 (en) 2010-03-15 2014-11-11 Solaronics S.A. Drying installation
EP2636951A1 (fr) 2012-03-07 2013-09-11 Flare Industries, LLC Appareil et procédé de brûlage à la torche de gaz résiduaire
WO2021030649A1 (fr) * 2019-08-14 2021-02-18 Zeeco, Inc. Appareil et procédé de torche assistée à faible consommation

Similar Documents

Publication Publication Date Title
US9074792B2 (en) Multiple-ring heat exchanger
US4366778A (en) Gas boiler able to operate in a sealed combustion circuit
US5370529A (en) Low NOx combustion system for fuel-fired heating appliances
US5848887A (en) Low emission combustion system
CN105745495A (zh) 燃料/空气混合和燃烧装置
US5913675A (en) Low NOx gas burner
US11339964B2 (en) Inward fired low NOX premix burner
WO2006010693A1 (fr) Torche de brulage a combustion de flamme interne
US5649529A (en) Low NOx combustion system for fuel-fired heating appliances
US10006628B2 (en) Low NOx gas burners with carryover ignition
NZ299072A (en) Fuel-fired heating appliance; comprises an nox reducing apparatus in the form of a tubular metal mesh structure having external ribs
US20170009982A1 (en) Ultra low nox insulating burner without collar
US5437248A (en) Fire tube boiler
US5222476A (en) Low NOx aspirated burner apparatus
US6435862B1 (en) Modulating fuel gas burner
JP4110290B2 (ja) 暖房装置用バーナー
US20110287373A1 (en) Pilot
CN105588323A (zh) 燃气热水器
WO2006082169A1 (fr) Tour de torche
US4846679A (en) Flueless, low NOx, low CO space heater
CA2345772A1 (fr) Bruleur a faible degagement de nox
CN211625680U (zh) 燃气热水设备
US20210341177A1 (en) Gas burner assembly
CA2085860A1 (fr) Bruleur a gaz avec grille de combustion, procede de combustion et installation de chauffage utilisant un tel bruleur
EP4123221A1 (fr) Brûleur à gaz avec un réducteur de volume

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase