EP0368829B1 - Brenner für festen Brennstoff - Google Patents

Brenner für festen Brennstoff Download PDF

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Publication number
EP0368829B1
EP0368829B1 EP89870159A EP89870159A EP0368829B1 EP 0368829 B1 EP0368829 B1 EP 0368829B1 EP 89870159 A EP89870159 A EP 89870159A EP 89870159 A EP89870159 A EP 89870159A EP 0368829 B1 EP0368829 B1 EP 0368829B1
Authority
EP
European Patent Office
Prior art keywords
burner
end plate
central conduit
peripheral conduits
peripheral
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
EP89870159A
Other languages
English (en)
French (fr)
Other versions
EP0368829A3 (de
EP0368829A2 (de
Inventor
Arthur Poos
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0368829A2 publication Critical patent/EP0368829A2/de
Publication of EP0368829A3 publication Critical patent/EP0368829A3/de
Application granted granted Critical
Publication of EP0368829B1 publication Critical patent/EP0368829B1/de
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
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2214/00—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00006—Liquid fuel burners using pure oxygen or oxygen-enriched air as oxidant

Definitions

  • the present invention relates to a solid fuel burner, in particular a finely divided coal burner.
  • This type of burner can be used whenever there is a need for very intense combustion and a very short flame, in particular in the case of low oxygen / carbon ratios, and especially for the injection of pulverized coal in a blast furnace.
  • the burner includes means for injecting an oxidizing gas, such as air, oxygen, an air-oxygen mixture or an oxygen-water vapor mixture.
  • burners are already known based on the principle of "post-mixing", that is to say constructed in such a way that the fuel and the oxidizer exit separately from the burner and meet outside of it, some distance from the burner outlet end. Such an arrangement makes it possible to avoid any risk of flashback.
  • These burners are, however, generally designed to use one or more liquid or gaseous fuels, which can be easily atomized and / or mixed with the combustion air.
  • application DE-A-33 34 156 discloses a pulverized coal burner, of the so-called "post-mixing" type, into which steam is injected around the jets of coal and oxidizing gas. .
  • the present invention provides a burner of the so-called "post-mix” type, intended for the use of a solid fuel such as finely divided coal, which does not present a risk of clogging and which ensures very intense combustion of the fuel. solid.
  • a solid fuel burner comprising a burner body, preferably cylindrical, closed by an end plate, as well as means serving to supply on the one hand a solid fuel and on the other hand a oxidizing gas and opening into said end plate, is characterized in that the means for supplying the solid fuel consist of a central duct, arranged along the longitudinal axis of said burner body, in that the means for supplying the oxidizing gas are constituted by a plurality of peripheral conduits arranged around said central conduit and in that the interior volume of said burner body, around said central conduit and said peripheral conduits, constitutes a cooling circuit of the burner.
  • the peripheral conduits are parallel to the central conduit and they are preferably distributed uniformly around the central conduit.
  • the central duct and / or the peripheral conduits can be formed by tubes of constant section.
  • the finely divided fuel jet generally transported by a pressurized carrier gas, bursts at the outlet of the central duct and mixes with the oxidizing gas leaving the peripheral ducts.
  • the terminal part of at least one of the peripheral conduits is internally provided with a longitudinal profile in the form of a Laval nozzle, that is to say comprising a convergent section, a neck and a divergent section succeeding one another in the direction of circulation of the oxidizing gas.
  • the dimensions of the Laval nozzle namely the diameter and the axial length of the neck, as well as the opening angles and the axial lengths of the converging and diverging sections, are determined, in a manner known per se, as a function of the flow rate and desired dynamic characteristics of the oxidizing gas jet to be produced.
  • the flame can start at a point more or less distant from the outlet face of the burner, in particular as a function of the outlet speed of the oxidizing gas and of the solid fuel. These speeds also influence the length of the flame.
  • At least one of the peripheral conduits ends, at its mouth in the end plate of the burner body, by a channel inclined relative to the longitudinal axis of said conduit.
  • This inclination may be such that the axes of these end portions intersect the longitudinal axis of the burner, outside of the latter and forwardly relative to the end plate.
  • the axes of the terminal parts of all the peripheral conduits can have the same inclination; they all intersect at the same point and thus form a converging surface. According to this angle of inclination, the flame obtained will generally be rather long and confined.
  • the axes of said end parts can have any inclination, and do not even cut the longitudinal axis of the burner body. It is thus possible, in particular, to impart to the flame a rotational movement which can, if necessary, provide it with increased penetrating power.
  • a burner arrangement comprising a cylindrical burner body 1, at the end of which is fixed, for example by welding, an end plate or outlet plate 2.
  • a inside the burner body 1 are arranged on the one hand a central duct 3 and peripheral ducts 4 surrounding the central duct 3.
  • the central duct 3 is arranged along the longitudinal axis of the burner body 1; the peripheral conduits 4 are arranged around the central conduit 3 and parallel to the latter, they are for example 6 in number and angularly spaced by 60 °.
  • the conduits 3 and 4 are cylindrical and they open parallel to each other in the outlet plate 2.
  • the mouth itself of the central conduit 3 is situated slightly behind that of the peripheral conduits 4. It is located in a channel 5 formed in the outlet plate 2 and having internally a divergent longitudinal profile.
  • the interior volume 6 of the burner body 1 is traversed by a cooling agent.
  • the central conduit 3 and the peripheral conduits are connected, at the rear of the burner, respectively to a source of solid fuel and to a source of oxidizing gas, not shown but symbolized by the arrows C and O2.
  • the divergent profile of the outlet channel 5 causes the solid fuel jet leaving the central duct 3 to burst and expand. This finely divided solid fuel then mixes with the oxidizing gas leaving the peripheral ducts 4 and combustion is thus initiated at a certain distance in front of the burner.
  • FIG. 2 illustrates an arrangement making it possible to further improve the mixture of solid fuel and oxidizing gas.
  • the central duct 3 ends in an outlet channel 5 which has internally a divergent longitudinal profile.
  • peripheral conduits 4 or at least a part of them, have a terminal part 7 internally profiled in Laval nozzle.
  • the jets of oxidizing gas leaving the nozzles 7 are expanded and mix more intimately with the solid fuel, ensuring better combustion of the latter.
  • FIG. 3 represents a type of nozzle 8 usable with a burner according to the invention such as that of FIG. 2.
  • the nozzle 8 has a threaded surface 9 thanks to which it can be screwed into a corresponding threaded bore 10 formed at the end of a peripheral conduit 4 ( Figure 2).
  • This nozzle 8 has an axial passage 11 which comes place in the extension of the peripheral conduit 4 and which ends, on the outlet side, by an oblique channel 12.
  • This channel 12 can be oriented in a radial plane of the peripheral conduit 4, so as to form, with the channels 12 of the other peripheral conduits 4, a conical surface either convergent or divergent.
  • the channels 12 can also be oriented in such a way that their axes do not intersect the longitudinal axis of the body of the burner 1. In particular, they can form a left surface, such as a hyperboloid of revolution to impart the mixture and the flame which results in a rotational movement around its longitudinal axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Gas Burners (AREA)

Claims (8)

  1. Brenner für festen Brennstoff mit einem Brennergehäuse (1) sowie mit Mitteln, welche einerseits dazu dienen einen festen Brennstoff zu befördern und aus einer zentralen, entlang der Achse des besagten Brennergehäuses (1) angeordneten Leitung (3) bestehen und welche andrerseits ein oxydierendes Gas befördern und aus einer Mehrzahl von peripheren, um die besagte zentrale Leitung (3) herum angeordneten Leitungen (4) bestehen, dadurch gekennzeichnet, daß das besagte Brennergehäuse (1) durch eine Endplatte (2) abgeschlossen ist, daß die besagten Mittel durch die besagte Endplatte (2) münden, daß die Mündung der besagten zentralen Leitung (3) in der besagten Endplatte in Bezug auf die Mündungen der besagten peripheren Leitungen (4) axial nach hinten versetzt ist und daß das innere Volumen (6) des besagten Brennergehäuses (1), das die besagte zentrale Leitung (3) und die besagten peripheren Leitungen (4) umgibt, einen Kühlungskreislauf für den Brenner darstellt.
  2. Brenner nach Anspruch 1, dadurch gekennzeichnet, daß die peripheren Leitungen (4) parallel zu der besagten zentralen Leitung (3) verlaufen.
  3. Brenner nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die besagten peripheren Leitungen (4) gleichmäßig um die zentrale Leitung (3) herum verteilt sind.
  4. Brenner nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die zentrale Leitung (3) an ihrer Mündung in der Endplatte (2) in einem Kanal (5) endet, welcher ein inneres divergierendes Längsprofil aufweist.
  5. Brenner nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß wenigstens eine der besagten peripheren Leitungen (4) einen Endteil (7) aufweist, welcher ein inneres Längsprofil einer Lavaldüse aufweist.
  6. Brenner nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß wenigstens eine der besagten peripheren Leitungen (4) an ihrer Mündung in der Endplatte (2) in einem Kanal (12) endet, welcher in Bezug auf die Längsachse der besagten Leitung (4) geneigt ist.
  7. Brenner nach Anspruch 6, dadurch gekennzeichnet, daß die Achsen der besagten geneigten Kanäle (12) die Längsachse des Brennergehäuses (1) schneiden und eine konische Fläche um die besagte Achse herum bilden.
  8. Brenner nach Anspruch 6, dadurch gekennzeichnet, daß die Achsen der besagten geneigten Kanäle (12) die Längsachse des Brennergehäuses (1) nicht schneiden und eine schräge Rotationsfläche um die besagte Achse herum bilden.
EP89870159A 1988-10-31 1989-10-24 Brenner für festen Brennstoff Expired - Lifetime EP0368829B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8801251 1988-10-31
BE8801251A BE1002580A6 (fr) 1988-10-31 1988-10-31 Bruleur a combustible solide.

Publications (3)

Publication Number Publication Date
EP0368829A2 EP0368829A2 (de) 1990-05-16
EP0368829A3 EP0368829A3 (de) 1991-03-27
EP0368829B1 true EP0368829B1 (de) 1995-03-15

Family

ID=3883705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89870159A Expired - Lifetime EP0368829B1 (de) 1988-10-31 1989-10-24 Brenner für festen Brennstoff

Country Status (4)

Country Link
EP (1) EP0368829B1 (de)
AT (1) ATE119986T1 (de)
BE (1) BE1002580A6 (de)
DE (1) DE68921697T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9314112D0 (en) * 1993-07-08 1993-08-18 Northern Eng Ind Low nox air and fuel/air nozzle assembly
AT402440B (de) * 1995-06-01 1997-05-26 Voest Alpine Ind Anlagen Brenner
AT402963B (de) * 1995-09-07 1997-10-27 Voest Alpine Ind Anlagen Verfahren zum verbrennen von brennstoff

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027587A1 (de) * 1980-07-21 1982-02-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Brenner fuer feste brennstoffe
DD210733A1 (de) * 1982-10-04 1984-06-20 Freiberg Brennstoffinst Kohlenstaubbrenner und verfahren fuer seinen betrieb
DE3541616A1 (de) * 1985-11-25 1987-05-27 Krupp Polysius Ag Brenner fuer pulverfoermigen brennstoff
US4628832A (en) * 1986-01-29 1986-12-16 Coen Company, Inc. Dual fuel pilot burner for a furnace

Also Published As

Publication number Publication date
BE1002580A6 (fr) 1991-04-02
ATE119986T1 (de) 1995-04-15
DE68921697T2 (de) 1995-11-09
EP0368829A3 (de) 1991-03-27
EP0368829A2 (de) 1990-05-16
DE68921697D1 (de) 1995-04-20

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