EP0978685A1 - Verbesserung an Brennern mit Abgasrückführung und niedrigem Stickoxydausstoss - Google Patents

Verbesserung an Brennern mit Abgasrückführung und niedrigem Stickoxydausstoss Download PDF

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Publication number
EP0978685A1
EP0978685A1 EP99430015A EP99430015A EP0978685A1 EP 0978685 A1 EP0978685 A1 EP 0978685A1 EP 99430015 A EP99430015 A EP 99430015A EP 99430015 A EP99430015 A EP 99430015A EP 0978685 A1 EP0978685 A1 EP 0978685A1
Authority
EP
European Patent Office
Prior art keywords
air
duct
nozzles
peripheral
recirculation
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.)
Withdrawn
Application number
EP99430015A
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English (en)
French (fr)
Inventor
Frédéric Bury
Jean-Claude Gauthier
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.)
Entreprise Generale de Chauffage Industriel Pillard SA
Original Assignee
Entreprise Generale de Chauffage Industriel Pillard 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 Entreprise Generale de Chauffage Industriel Pillard SA filed Critical Entreprise Generale de Chauffage Industriel Pillard SA
Publication of EP0978685A1 publication Critical patent/EP0978685A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel
    • 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
    • F23C7/02—Disposition of air supply not passing through burner
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/20—Premixing fluegas with fuel
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/30—Premixing fluegas with combustion air

Definitions

  • the present invention relates to improvements brought to industrial burners with liquid or gaseous fuel.
  • the document EP 675 321 describes a gas fuel burner which has several central fuel transport conduits gaseous, arranged in the central part of an air supply channel, called primary injection means; these means consist of rods, the ends of which are folded outwards and arranged under the slots of a flame stabilizer; the ends of the rods are holes through which combustible gas is injected into the fireplace through the slots in the stabilizer.
  • the burner also comprises several peripheral conduits of transport of gaseous fuel, and means for mixing this fuel with combustion fumes produced in the home, as well as means for recirculating smoke; this burner has indeed means (called secondary) of fuel injection gas, which consist of rods ending in a nozzle each opening into a smoke recirculation duct produced in the home; according to this document, all of the means secondary injection, as well as the associated recirculation conduits, are located inside the air channel (called primary), to ensure their cooling.
  • secondary fuel injection gas
  • Each peripheral fuel injection nozzle is arranged inside a recirculation duct which communicates by its two ends with the hearth; this allows by ejection effect to achieve a recirculation of the fumes which mix with the combustible gas and reduce the formation of nitrogen oxides; to complete this effect of reduction by increasing the combustion stage, the burner includes means (called tertiary) for injecting gaseous fuel, constituted by rods crossing the wall of the enclosure of the hearth; each rod is associated with an air intake channel surrounding the rod.
  • the burner described in this document presents some disadvantages; in fact, the gas streams delivered by the canes and the air channels associated with these tertiary injection means are likely to form gas streams and / or a curtain surrounding the secondary means of fuel gas injection, which is likely to disrupt and limit the effectiveness of the smoke recirculation by secondary injection means gaseous fuel; another disadvantage results from the difficulty of adjust and control the effect produced by the air jets surrounding the jets of gas from tertiary means of injection, and in particular to control these coaxial jets and their mixture necessary for good combustion with the other jets caused by this burner, which is equipped with three separate gas fuel injection systems and two separate air transport and injection systems in the burner (and the home).
  • a drawback related to this device equipped with three means for injecting gaseous fuel which includes canes extending through the walls delimiting the enclosure of the hearth, resides in the large size of this system and the difficulty in repair, maintain and / or modify such a system partially embedded in the perimeter wall of the foyer.
  • An objective of the present invention is to provide a burner improved and partially remedy at least the disadvantages of known burners while improving their performance in the reduction in the formation of nitrogen oxides.
  • An objective of the present invention consists in particular in improve the self-recirculation of smoke.
  • An objective of the present invention is also to propose a compact, simple, inexpensive and improved burner.
  • Each of said air ejection nozzles causes the formation an air jet entering the enclosure delimiting the hearth through the orifice outlet of the nozzle which is located in the vicinity of the internal face of the wall of the enclosure, substantially flush and the latter and preferably slightly protruding, in particular from a distance on the order of radius or nozzle diameter; each jet of air causes depression at vicinity of said outlet, which causes the suction of smoke which are then entrained by the air jet with which they mix to form a gas mixture whose oxygen concentration is lower than that of air; this oxidizing gas mixture leads to a low production of nitrogen oxides during combustion.
  • the nozzles are preferably constructed in the form of simple short sections of tube, which are preferably parallel to the axis longitudinal of the burner, the outlet openings of which preferably in at least one transverse plane (with reference to the axis length of the burner) which is (are) set back (upstream) from the outlets of the central fuel transport conduits and primary air; due to the fact that these air nozzle orifices are located in rear of the outlet (end) ports of the central air ducts and of fuel, and thanks to the mixture of air ejected by the nozzles with the smoke, avoiding contacting of secondary air (ejected by nozzles) "pure" with the combustion zone, while making it possible to obtain a compact structure where the air nozzles are located at a short distance of the longitudinal axis of the burner.
  • the length of the tube sections forming the nozzles is generally close to their radius or diameter.
  • tube sections also serve to guide the air in nozzle outlet; the sections are preferably welded by their "upstream" end to a sheet or plate in the shape of a crown connecting the ferrules of said central and peripheral air transport ducts, the sheet being pierced with holes corresponding in shape and size to that tube sections.
  • peripheral air ejection nozzles contributes to improve combustion by causing both "staging" of the air intake and setting in motion (called “recirculation") of the fumes resulting in the creation of a gas mixture at low rate oxygen.
  • Said air nozzles are preferably identical, arranged at equal distance from the longitudinal axis of the burner (i.e. on a circle) and according to a symmetry of revolution (i.e. angularly equidistant).
  • peripheral air ejection nozzles are dissociated, that is to say separated and / or arranged at a distance from the nozzles gaseous fuel ejection devices, each of the air jets produced by these air nozzles and each of the gaseous fuel jets produced by these gas fuel ejection nozzles, leads to neighborhood of each nozzle, a depression causing the aspiration of a part of the smoke present in the fireplace; the fumes mix like this with each jet of air and each jet of gaseous fuel delivered by these nozzles, then are driven by each of these jets; so we improve notably the recirculation of the fumes and consequently one decreases the formation of nitrogen oxide; in addition, the different jets of fuel and air do not interfere with each other in a first time (in the vicinity of the nozzles), which means that the is more stable and easier to adjust, and this delays the air / fuel mixture, which only occurs after mixing with the fumes. Combustion thus occurs in a dilute atmosphere with a
  • the burner according to the invention is compact and can be easily installed in a hole (of corresponding section) provided in the wall of a fireplace, without requiring the creation of orifices separate devices for the passage of air injection canes and / or of fuel.
  • the peripheral gas injection nozzles are three to twelve, especially six to eight, arranged in a crown, regularly (angularly) distributed around the longitudinal axis (of general symmetry) of the burner, and the number of peripheral air ejection nozzles is equal to or double the number of peripheral nozzles for ejecting combustible gas; we can thus arrange the peripheral fuel nozzles and the nozzles air devices nested inside a single crown, the air and gas nozzles being alternated and distant to form separate jets regularly distributed in a ring around of the central part of the burner.
  • the longitudinal axes of the peripheral air and gases can expand in a diverging conical fashion, it is preferable that said axes are substantially parallel to the longitudinal axis of the burner and / or slightly inclined relative thereto.
  • the means of smoke recirculation by the jets of combustible gas produced by the peripheral ejection nozzles have a straight section of cylindrical conduit (or tube) arranged in the extension of each nozzle and at a distance (in front) thereof; said distance is preferably of the same order of magnitude as the radius or the diameter of the section of recirculation tube, in particular less than or equal to three times the diameter of the tube section, preferably less than or equal to two times the diameter of the tube section, for example of the order of 2 to 20 centimeters; thus, the free space between the nozzle and the inlet (the end upstream) of the recirculation duct facilitates the suction and mixing of the combustible gas with the fumes present in the hearth, delimiting a passage section for smoke of considerably larger dimensions larger than that delimited by the peripheral opening of the recirculation described in document EP 675 321; furthermore, this arrangement allows and / or facilitates adjustment, during assembly or the installation of the burner,
  • the end of the air nozzle extends in front of, or in the same transverse plane as, the inlet opening of the tube recirculation arranged in the extension of the peripheral nozzle fuel gas ejection.
  • One of the results of the invention is to combine the means allowing the staging of the combustion by delivery of the fuel in different areas, by supplying combustion air also by different circuits, as well as the recirculation of the fumes by driven by jets of combustible gas, and the recirculation of smoke further by entrainment by jets of combustion air, which optimizes burner operation and reduces particularly the production of nitrogen oxide.
  • Figure 1 illustrates in schematic perspective view the arrangement of the air and combustible gas ejection nozzles fitted a liquid and / or gaseous fuel burner according to the invention.
  • Figure 2 illustrates in cross-sectional view through two half-planes longitudinal intersecting along the longitudinal axis, and is a view according to II - II of Figure 3.
  • FIG. 3 is a front view of the front end of the burner and is a view along III of FIGS. 1 and 2.
  • Figures 4 and 5 illustrate views respectively identical to those of FIGS. 2 and 3, a liquid fuel burner or gaseous equipped with air ejection nozzles according to the invention; the Figure 5 is a view along V of Figure 4 and Figure 4 is a section according to IV-IV of Figure 5.
  • the burner 1 has a first cylindrical shell 2 with an axis longitudinal 3 horizontal, a second cylindrical shell 4 coaxial with the first, which delimits with the ferrule 2 a duct 5 of section annular; the ferrule 2 defines a central duct 31 for air passage primary.
  • the burner extends through a cylindrical orifice 6 provided in the wall 7 separating the hearth 8 from the outside 9 of the enclosure.
  • the burner comprises in the central part a central rod 10 of transport of combustible gas (in particular such as heavy fuel oil, diesel, petrol, oils, waste liquids ...) up to the burner head equipped with a central nozzle 11 and a flame stabilizer 12, which are arranged at the front end of the duct 31 and of the ferrule 2, and are protruding inside the fireplace 8.
  • combustible gas in particular such as heavy fuel oil, diesel, petrol, oils, waste liquids
  • the burner comprises a bundle of six peripheral tubes 13 of transport of combustible gases, which are each equipped at their end front of a nozzle 14 disposed substantially flush (for example 1 cm prominent) on the inner face 15 of the wall 7.
  • a part of the tubes 13 extends parallel to the axis 3 to the interior of the secondary air transport duct 5; the tubes 13 are supplied by a common collector 16, and pass through a annular flange 17 connecting the ferrules 2 and 4 and in which are provided six circular nozzles 18 for ejecting air; as illustrated in figures 1 and 3, the six identical nozzles 18 are spaced angularly by 60 degrees, same as the six nozzles 14 for ejecting combustible gas and are arranged in between (alternating): the angular space 19 between a nozzle 14 and an adjacent nozzle 18 is in this case close to 30 degrees.
  • the respective longitudinal axes 20, 21 of the nozzles 14, 18, which are parallel to axis 3, are located on identical or neighboring radii.
  • the axis of the tubes 22 coincides with the axis of the nozzles 14 and the rear end 24 of identical sections 22 is disposed at a distance 25 from the corresponding nozzle 14, which distance is by example close to 50 millimeters.
  • Said rear end 24 extends substantially in the plane containing the orifice 26 for the outlet of the air ejection nozzles 18.
  • the burner 1 has a structure similar to that of Figures 1 to 3; however, the burner of Figures 4 and 5 does not have a peripheral conduit (as identified 13 Figures 1 to 3) transport of gaseous fuels, nozzles 14 or conduit 22 associated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP99430015A 1998-08-07 1999-08-04 Verbesserung an Brennern mit Abgasrückführung und niedrigem Stickoxydausstoss Withdrawn EP0978685A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9810350A FR2782150B1 (fr) 1998-08-07 1998-08-07 Perfectionnements aux bruleurs a recirculation de fumees et a faible emission d'oxydes d'azote
FR9810350 1998-08-07

Publications (1)

Publication Number Publication Date
EP0978685A1 true EP0978685A1 (de) 2000-02-09

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Family Applications (1)

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EP99430015A Withdrawn EP0978685A1 (de) 1998-08-07 1999-08-04 Verbesserung an Brennern mit Abgasrückführung und niedrigem Stickoxydausstoss

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EP (1) EP0978685A1 (de)
FR (1) FR2782150B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113531562A (zh) * 2021-07-29 2021-10-22 岳阳远东节能设备有限公司 一种危废处理焚烧废气、废液低氮燃烧器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2797321B1 (fr) * 1999-08-04 2001-10-26 Pillard Chauffage Bruleurs a recirculation de fumees et a faible emission d'oxydes d'azote et rechauffeurs de gaz comportant de tels bruleurs

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3821526A1 (de) * 1988-06-25 1989-12-28 May Michael G Verfahren und einrichtung zur verbrennung von brennstoff
EP0348646A2 (de) * 1988-06-30 1990-01-03 Deutsche Babcock Energie- Und Umwelttechnik Aktiengesellschaft Brenner
EP0386732A2 (de) * 1989-03-10 1990-09-12 Oertli Wärmetechnik Ag Verbrennungseinrichtung für einen Zweistoffbrenner
EP0405294A2 (de) * 1989-06-24 1991-01-02 Balcke-Dürr AG Vorrichtung zur Verbrennung von Brennstoffen in einer Brennkammer
DE9312358U1 (de) * 1993-08-20 1994-02-24 Saacke Gmbh & Co Kg Vorrichtung zum emissionsarmen Verbrennen von fließfähigen und/oder gasförmigen Brennstoffen mit interner Rauchgasrezirkulation
EP0675321A1 (de) * 1994-03-29 1995-10-04 ENTREPRISE GENERALE DE CHAUFFAGE INDUSTRIEL PILLARD. Société anonyme dite: Gasbrenner mit sehr niedrigen Stickstoffoxidemissionen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3821526A1 (de) * 1988-06-25 1989-12-28 May Michael G Verfahren und einrichtung zur verbrennung von brennstoff
EP0348646A2 (de) * 1988-06-30 1990-01-03 Deutsche Babcock Energie- Und Umwelttechnik Aktiengesellschaft Brenner
EP0386732A2 (de) * 1989-03-10 1990-09-12 Oertli Wärmetechnik Ag Verbrennungseinrichtung für einen Zweistoffbrenner
EP0405294A2 (de) * 1989-06-24 1991-01-02 Balcke-Dürr AG Vorrichtung zur Verbrennung von Brennstoffen in einer Brennkammer
DE9312358U1 (de) * 1993-08-20 1994-02-24 Saacke Gmbh & Co Kg Vorrichtung zum emissionsarmen Verbrennen von fließfähigen und/oder gasförmigen Brennstoffen mit interner Rauchgasrezirkulation
EP0675321A1 (de) * 1994-03-29 1995-10-04 ENTREPRISE GENERALE DE CHAUFFAGE INDUSTRIEL PILLARD. Société anonyme dite: Gasbrenner mit sehr niedrigen Stickstoffoxidemissionen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113531562A (zh) * 2021-07-29 2021-10-22 岳阳远东节能设备有限公司 一种危废处理焚烧废气、废液低氮燃烧器

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Publication number Publication date
FR2782150A1 (fr) 2000-02-11
FR2782150B1 (fr) 2000-11-10

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