EP0926435A1 - Verbesserung an Brennern für festen Brennstoff - Google Patents

Verbesserung an Brennern für festen Brennstoff Download PDF

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Publication number
EP0926435A1
EP0926435A1 EP98430028A EP98430028A EP0926435A1 EP 0926435 A1 EP0926435 A1 EP 0926435A1 EP 98430028 A EP98430028 A EP 98430028A EP 98430028 A EP98430028 A EP 98430028A EP 0926435 A1 EP0926435 A1 EP 0926435A1
Authority
EP
European Patent Office
Prior art keywords
duct
obstacles
channels
solid fuel
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.)
Withdrawn
Application number
EP98430028A
Other languages
English (en)
French (fr)
Inventor
Jean-Claude Pillard
Jean-Claude Gauthier
Jacques Pizant
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 EP0926435A1 publication Critical patent/EP0926435A1/de
Withdrawn legal-status Critical Current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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/003—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • 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
    • F23D17/007—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel liquid or pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20—Fuel flow guiding devices

Definitions

  • the present invention relates to fuel burners solid, and in particular to pulverized coal burners liable to equip ovens, in particular rotary ovens.
  • the technical sector of the invention is that of the manufacture of oven burners.
  • the object of the present invention is to provide a burner with solid fuel that is improved.
  • the object of the present invention is in particular to reduce the production of nitrogen oxides resulting from combustion.
  • the solution to the problem posed consists in proposing a burner with solid fuel which has at least one section duct solid fuel supply ring and at least one duct air supply ring, which is arranged substantially coaxially and externally to the supply pipe in solid fuel; said burner has at least two obstacles provided in the fuel supply duct, which divide the leads in at least two channels, near the outlet of the duct, i.e. from the burner nozzle, so as to cause the separation of the incident solid fuel stream into at least two veins to allow the formation of at least two flames.
  • the invention consists in implementing a process for operating an oven equipped with a burner, in which maintains the average speed of solid fuel in the pipe and in the channels separated by obstacles to a value at least equal to 20 meters per second and at most equal to 30 meters per second, and in which is delivered around the solid fuel stream a part of primary air in swirling form and part of the primary air in substantially axial form and maintaining an axial air flow greater than the swirling air flow, for example an axial air flow close to twice the swirling air flow.
  • Figure 1 illustrates schematically and in perspective view an embodiment of a fuel supply duct solid part of the burner nozzle, fitted at its end with five obstacles in the form of profiled triangular corners separating the vein solid fuel in five veins flowing in canals delimited by these obstacles.
  • Figure 2 is a partial longitudinal sectional view of the nozzle a burner according to the invention.
  • Figure 3 is a front view and is a view along III of the figure 2, the nozzle of a burner according to the invention.
  • the conduits 3, 5, 7, 9, 11 are arranged along an axis 1 longitudinal common to these different conduits, in the vicinity of their end (in the left part of FIG. 2) constituting the nozzle of the burner, allowing the production of a flame; the products (air and fuel) flow in these conduits according to arrow 15, that is to say from right to left with reference to Figure 2; these conduits 3, 5, 7, 9, 11 are delimited and separated from each other by walls respectively 4, 6, 8, 10.
  • the fourth and fifth conduits 9, 11 supply air serve to deliver a first air flow of axial combustion, i.e. moving substantially parallel to the common longitudinal axis of the ends (forming a nozzle) of the different ducts, and serve to deliver a second air flow of combustion set in rotation, i.e. moving substantially in vortices according to a propeller whose axis coincides with said axis longitudinal common 1.
  • the envelope of the resulting flames has a central area that extends forward and radially, in which practically does not produce any appreciable combustion of the fuel with air oxygen; a primary air flow in this central area, which is below 20% and preferably below 10% of the total primary air, avoids a backward flow of products of combustion, without providing much oxygen which would decrease the fuel-rich central area.
  • the beach burner adjustment is increased to less than 10% of the rate maximum, for which the burner is designed; to the extent that such burner must operate on solid and powdery fuels, after a brief preheating with oil, it can already operate with solid fuel.
  • the proportion of primary air that should be used to stabilize the flame can be reduced from 2 to 10% and, preferably, below 6% compared to the overall quantity of combustion air; the reduced primary air consumption saves energy for an equal performance, and allows the reduction of the proportion nitrogen oxides in the flue gases.
  • the spokes of the central opening of the flame stabilizer 16 and the annular orifice for the primary air stream located most inside are chosen, so that the primary air flow interior is at a distance from axis 1 which corresponds at least to double the central opening of the flame stabilizer.
  • the opening center of the flame stabilizer corresponds substantially to the orifice the nozzle of the central fuel conduit 3; this prevents the liquid fuel does not come into contact with oxygen too early primary air streams leaving the ducts 9, 11.
  • the ducts 9, 11 annular primary air supply have conical walls and these walls as well as the connected concentric tubes to these are axially movable relative to each other; we can thus adjust the free cross section of the annular passage; the ends of each duct 9, 11 are cylindrical in order to avoid a divergent flow at the outlet of the nozzle; in the annular duct 11 axial air supply, 19 radial partitions are arranged intended for axial orientation and primary air circulation in separate channels.
  • partitions contribute to an additional axial orientation of the corresponding primary air and also increase the axial outlet speed, by the fact that they reduce the free section of the annular duct and that they divide it into a plurality of channels 11 1 . ..11 4 arranged around a ring. Some of these channels may be closed or be adjustable. To this end, the partitions can be made wide enough in the peripheral direction so that they close off a channel at least in part or that they correspond to a closed channel; increasing the axial air flow speed helps stabilize the flame.
  • the flame stabilizer 16 is shifted backwards (by reference to the direction of circulation) with respect to the outlet orifices 70, 90, 110 of the main part of the primary air and fuel solid, by fixing the flame stabilizer to the envelope tube of the burner rod, which is axially movable.
  • the duct 7 solid fuel supply includes an upstream part on the right in this figure, which has a cross section annular; due to the presence of the five wedge-shaped obstacles 17 triangular profile, the duct 7 is divided into five channels 71, 72, 73, 74, 75 which are each delimited by, on the one hand, the external face 6A of the wall 6 separating the conduit 7 from the conduit 5, on the other hand the internal face 8A of the wall 8 separating the conduit 7 from the conduit 9, and also lateral faces 173 of the wedge-shaped obstacles 17, which extend to from their tapered or profiled rear end 170, the cross section of which transverse widens or increases from their leading edge 170 to their terminal section 171 corresponding to the end or front face nozzle; so for example to maintain a passage section of the substantially constant solid fuel between the upstream part of the completely annular section duct and the downstream part provided with obstacles and divided into five channels, the internal radius of the vein remaining for example constant due to a cylindrical surface 6A, the radius external 21
  • each solid fuel passage channels 71 located between two consecutive obstacles 17 are associated with four channels 11 1 , 11 2 , 11 3 , 11 4 delimited by partitions 19 1 , 19 2 , 19 3 , 19 4 which are provided in the annular duct 11 for supplying axial primary air and allow the formation of four axial air jets associated with the flow of solid fuel leaving the channel 71 to promote the combustion of this fuel;
  • the first three channels 11 1 , 11 2 , 11 3 are substantially arranged radially opposite the channel 71 for ejecting the solid fuel, and are completed by a fourth channel 11 4 disposed downstream of the channels 11 1 , 11 2 , 11 3 by reference to the direction 9 1 of rotation of the swirling air delivered at the outlet of the burner nozzle by the duct 9 for supplying swirling primary air; in this way, all of the channels 11 1 , 11 2 , 11 3 , 11 4 associated with channel 71 are angularly offset
  • the burner illustrated in FIGS. 2 and 3 also includes a duct additional 13, also of annular section, arranged coaxially to conduits 3, 5, 7, 9, 11, and outside of them, which serves to deliver through an annular peripheral or external outlet orifice 130 a flow oxygen-depleted gas, particularly smoke resulting from the combustion.
  • This preferred embodiment makes it possible to further reduce the formation of NO X both as thermal and as fuel for such burners comprising at least two substantially concentric conduits: a fuel supply duct 7 and at least one supply duct 9, 11 in primary combustion air representing a maximum of 15% of the total air; these conduits together form a nozzle at the outlet of which the start of combustion can take place and around which secondary air is brought representing at least 85% of the total air and having a temperature of more than 500 ° C; according to a preferred embodiment, the burner comprises at least four independent supply circuits, one of which supplies the annular duct 13 surrounding all of said ducts 3, 5, 7, 9, 11 for supplying fuel and primary air; inside the duct 13 circulates oxygen-depleted gas, and outside this duct is supplied the secondary air; the inner edge of the outlet port 130 of the conduit 13 is offset radially (that is to say distant from the axis 1) relative to the outer edge of the outlet ports 110 of the concentric conduit 11 (the outermost of the nozzle) by an annular hub 900 of thickness at
  • the exit speed of the oxygen-depleted gas is lower than that (V c ) of the primary air, and of the order of magnitude of that (V a ) of the secondary air; in addition, the outlet orifice 130 of the annular duct can diverge and form an angle ⁇ , between 2 and 10 ° relative to the axis 1 of the burner; the oxygen-depleted gas is preferably recycled flue gas, or steam or a mixture of steam and fumes.
  • said burner can also have outside protection 907 (concrete) of the outermost concentric conduit and towards the outlet orifice thereof, obstacles capable of deflecting and deviating from the axis 1 of the nozzle the flow VA secondary air flow 903.
  • outside protection 907 concrete of the outermost concentric conduit and towards the outlet orifice thereof, obstacles capable of deflecting and deviating from the axis 1 of the nozzle the flow VA secondary air flow 903.
  • annular conduit 13 which surrounds all of the fuel supply and primary air, which is supplied with oxygen-depleted gas, and which is arranged at a minimum distance from the most external primary air supply, keep the air flow away from it secondary and allows to delay the energy exchange, and therefore their mixture, between these various flows: these indeed arrive at speeds different, the speed of the secondary air being of the order of 10 to 50 meters per second, while that of primary air is around 150 to 200 meters per second.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP98430028A 1997-12-24 1998-12-11 Verbesserung an Brennern für festen Brennstoff Withdrawn EP0926435A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9716741A FR2772888B1 (fr) 1997-12-24 1997-12-24 Amelioration aux bruleurs a combustible solide
FR9716741 1997-12-24

Publications (1)

Publication Number Publication Date
EP0926435A1 true EP0926435A1 (de) 1999-06-30

Family

ID=9515333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98430028A Withdrawn EP0926435A1 (de) 1997-12-24 1998-12-11 Verbesserung an Brennern für festen Brennstoff

Country Status (2)

Country Link
EP (1) EP0926435A1 (de)
FR (1) FR2772888B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011288A1 (en) * 1999-08-06 2001-02-15 Fls Miljø A/S A burner
EP1136776A2 (de) * 2000-03-22 2001-09-26 ITALCEMENTI S.p.A. Vorrichtung zur Einspritzung von festen Brennstoffen in zerstäubter Form in einem Zementofen
WO2007101427A1 (de) * 2006-03-09 2007-09-13 Alstom Technology Ltd. Rundbrenner
US20090208889A1 (en) * 2005-06-27 2009-08-20 Jean-Claude Pillard Burner
CN101315189B (zh) * 2008-07-03 2011-05-04 徐州燃控科技股份有限公司 分级调风低NOx混烧燃烧器
CN108730970A (zh) * 2017-04-15 2018-11-02 南京建安机械制造有限公司 五通道煤粉燃烧器

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR673373A (fr) * 1928-08-02 1930-01-14 Appareils Manutention Fours Stein Sa Perfectionnements apportés aux brûleurs à combustibles pulvérisés ou gazeux
US3944142A (en) * 1974-03-22 1976-03-16 Foster Wheeler Energy Corporation Split stream burner assembly
US4023921A (en) * 1975-11-24 1977-05-17 Electric Power Research Institute Oil burner for NOx emission control
GB2080513A (en) * 1980-07-21 1982-02-03 Kloeckner Humboldt Deutz Ag A solid fuel burner
JPS5929904A (ja) * 1982-08-10 1984-02-17 Babcock Hitachi Kk 低窒素酸化物燃焼装置
US4846666A (en) * 1987-05-08 1989-07-11 Krupp Polysius Ag Method and burner for burning fuel
EP0421903A2 (de) * 1989-10-04 1991-04-10 ENTREPRISE GENERALE DE CHAUFFAGE INDUSTRIEL PILLARD. Société anonyme dite: Verfahren zum Betreiben eines Brenners und Brenner für Drehofen
EP0554014A2 (de) * 1992-01-27 1993-08-04 Foster Wheeler Energy Corporation Brennerbaueinheit mit aufgeteilter Strömung
EP0667488A2 (de) * 1994-02-10 1995-08-16 ROLLS-ROYCE POWER ENGINEERING plc Brenner zur Verbrennung von Brennstoff

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR673373A (fr) * 1928-08-02 1930-01-14 Appareils Manutention Fours Stein Sa Perfectionnements apportés aux brûleurs à combustibles pulvérisés ou gazeux
US3944142A (en) * 1974-03-22 1976-03-16 Foster Wheeler Energy Corporation Split stream burner assembly
US4023921A (en) * 1975-11-24 1977-05-17 Electric Power Research Institute Oil burner for NOx emission control
GB2080513A (en) * 1980-07-21 1982-02-03 Kloeckner Humboldt Deutz Ag A solid fuel burner
JPS5929904A (ja) * 1982-08-10 1984-02-17 Babcock Hitachi Kk 低窒素酸化物燃焼装置
US4846666A (en) * 1987-05-08 1989-07-11 Krupp Polysius Ag Method and burner for burning fuel
EP0421903A2 (de) * 1989-10-04 1991-04-10 ENTREPRISE GENERALE DE CHAUFFAGE INDUSTRIEL PILLARD. Société anonyme dite: Verfahren zum Betreiben eines Brenners und Brenner für Drehofen
EP0554014A2 (de) * 1992-01-27 1993-08-04 Foster Wheeler Energy Corporation Brennerbaueinheit mit aufgeteilter Strömung
EP0667488A2 (de) * 1994-02-10 1995-08-16 ROLLS-ROYCE POWER ENGINEERING plc Brenner zur Verbrennung von Brennstoff

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 128 (M - 302) 14 June 1984 (1984-06-14) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001011288A1 (en) * 1999-08-06 2001-02-15 Fls Miljø A/S A burner
EP1136776A2 (de) * 2000-03-22 2001-09-26 ITALCEMENTI S.p.A. Vorrichtung zur Einspritzung von festen Brennstoffen in zerstäubter Form in einem Zementofen
EP1136776A3 (de) * 2000-03-22 2002-08-14 ITALCEMENTI S.p.A. Vorrichtung zur Einspritzung von festen Brennstoffen in zerstäubter Form in einem Zementofen
US20090208889A1 (en) * 2005-06-27 2009-08-20 Jean-Claude Pillard Burner
US9011141B2 (en) * 2005-06-27 2015-04-21 Egci Pillard Burner
WO2007101427A1 (de) * 2006-03-09 2007-09-13 Alstom Technology Ltd. Rundbrenner
AU2007222784B2 (en) * 2006-03-09 2011-02-24 General Electric Technology Gmbh Round burner
CN101315189B (zh) * 2008-07-03 2011-05-04 徐州燃控科技股份有限公司 分级调风低NOx混烧燃烧器
CN108730970A (zh) * 2017-04-15 2018-11-02 南京建安机械制造有限公司 五通道煤粉燃烧器

Also Published As

Publication number Publication date
FR2772888B1 (fr) 2000-03-10
FR2772888A1 (fr) 1999-06-25

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