EP3574260A1 - Brûleur, notamment brûleur radiant pour lignite - Google Patents

Brûleur, notamment brûleur radiant pour lignite

Info

Publication number
EP3574260A1
EP3574260A1 EP18704168.6A EP18704168A EP3574260A1 EP 3574260 A1 EP3574260 A1 EP 3574260A1 EP 18704168 A EP18704168 A EP 18704168A EP 3574260 A1 EP3574260 A1 EP 3574260A1
Authority
EP
European Patent Office
Prior art keywords
fuel channel
burner
fuel
burner according
guide elements
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Withdrawn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
EP18704168.6A
Other languages
German (de)
English (en)
Inventor
Michael Hohendorf
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.)
Bilfinger Engineering and Technologies GmbH
Original Assignee
Bilfinger Engineering and Technologies GmbH
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 Bilfinger Engineering and Technologies GmbH filed Critical Bilfinger Engineering and Technologies GmbH
Publication of EP3574260A1 publication Critical patent/EP3574260A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10—Nozzle tips
    • F23D2201/101—Nozzle tips tiltable
    • 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

  • Burner in particular lignite jet burners
  • the invention relates to a burner, in particular jet burner, for combustion of pulverulent fuel, in particular brown coal, with at least one fuel channel with a directed towards a combustion chamber mouth and at least one directed towards the combustion chamber air nozzle, wherein the fuel through the fuel passage in the combustion chamber is injected and wherein the fuel channel has a rectangular cross-section.
  • jet burners For a low-NO x combustion in a lignite boiler, jet burners have proven themselves.
  • the fuel is guided in rectangular cross sections and injected into the combustion chamber.
  • Lignite burners work mostly as pure parallel flow burners with delayed mixing of air and coal dust by the spatial separation of air and dust nozzles. The mixing zones between air and dust are minimized to avoid zones with high local excess air.
  • the incipient combustion is intensified where secondary air is mixed into the already substoichiometrically reacting zones.
  • the combustion temperature in the main combustion zone is lowered, thereby simultaneously reducing the formation of thermal nitrogen oxides.
  • the air / fuel mixture at the burner mouth must not be too rich ( ⁇ «1) and not too lean ( ⁇ » 1).
  • Concentrated blowing of the pulverized coal quickly converts the volatiles from the fuel. This will make combustion fast substoichiometric.
  • the volume flow of the carrier gas is not freely selectable, but depending on the discharge behavior of the mill.
  • the ignition of the pulverized coal flame takes place in the region of local sub-stoichiometry at the interfaces between secondary air and the coal dust-carrier gas mixture and thus low in NO.
  • the momentum ratios and the distance between the secondary air and the pulverized coal nozzle are of crucial importance.
  • the exit velocity of the primary stream should be approx. 20 m / s and the secondary air velocity approx. 50 m / s. Due to this high speed difference, these two streams mix according to the laws of free jet propagation.
  • core air is injected directly into the coal dust / carrier gas mixture via separate nozzles.
  • the ignition of the pulverized coal flame takes place only locally at the cut surfaces between secondary air and the coal dust-carrier gas mixture. This can lead to a significant delay in the ignition due to geometric conditions. It can also happen by this local ignition, that the coal dust does not burn completely and thereby the efficiency decreases and the
  • Fuel quantity must be increased.
  • a generic jet burner is known from DE 44 16 945 Cl. Also there are in the fuel channel already formed by the core air ducts so-called.
  • the object of the present invention is to partially break up the pulverized coal strands by imparting a twist and thus to achieve earlier ignition and better burnout of the coal while the emission levels remain low.
  • the design effort is much lower compared to a complete redesign of a burner.
  • This object is achieved in a burner with the features of the preamble of claim 1, characterized in that in the at least one fuel channel, a plurality of guide elements for applying an at least partially rotating or swirling flow is arranged and that the guide elements arranged only in the region of the walls of the fuel channel are so that an inner area remains free of internals.
  • a plurality of guide elements are additionally installed in the fuel channels. These should if possible be arranged so that a partially conducted flow, for example in the form of a swirling motion to the entry into the
  • Combustion chamber is completely impressed, without causing deposits of coal dust.
  • the inner dust cross section remains free, so that a
  • Partial flow is mixed earlier. Due to the large number of guide elements, a very uniform influence can be exerted on the entire flow.
  • the guide elements are arranged according to the invention only in the region of the walls of the fuel channel, so that an inner region remains free of internals.
  • a plurality of core air pipes are arranged in each fuel channel.
  • the guide elements used are formed as swirl body, deflecting body or cross-sectional constriction body.
  • guide elements are any geometric shapes that produce in their entirety the imprint of a desired rotating or swirling flow pattern of Kohlenstaub- Traggasgemisches.
  • swirl body is understood to be an element by means of which the flow is set into a rotating movement.
  • a straight or curved sheet is used for this purpose.
  • a cross-sectional constriction body is an element through which the flow cross-section in the dust channel is narrowed and thus a directed flow is generated.
  • flow turbulences are generated on the side of the element which faces away from the flow due to a negative pressure area.
  • Another teaching of the invention provides to arrange the cross-sectional constriction body only on a side wall of the fuel channel. However, it is also possible to arrange these on two, three or all side walls.
  • the core air pipes are designed for each fuel channel as core air crosses and divide the fuel channel into individual sub-channels.
  • the core air pipes are arranged in a common lining, which form the core air cross.
  • each core air cross extends to the mouth of the fuel channel.
  • each fuel channel has an expansion in front of its mouth into the combustion chamber.
  • the guide elements according to the invention are arranged in the region of this widening.
  • FIG. 1 shows a burner mirror of a jet burner, schematized
  • Fig. 2 is a jet burner according to the burner mirror in Fig. 1 in
  • Fig. 3 shows a first embodiment of an inventive
  • FIG. 4 shows the article from FIG. 3 in vertical section, FIG.
  • Fig. 5 shows another embodiment of an inventive
  • FIG. 6 shows the article from FIG. 5 in vertical section
  • Fig. 7 shows another embodiment of an inventive
  • FIG. 8 shows the article from FIG. 7 in vertical section
  • Fig. 9 shows a further embodiment of an inventive
  • Jet burner in side view and the article of FIG. 9 in vertical section.
  • the burner mirror has a vertical arrangement Oberluitdüse 1, cooling air nozzles 2, at least one
  • the fuel channels 3 are considered for the present invention.
  • These fuel channels 3 are each divided by so-called core air crosses 7, which are used for the arrangement of the core air pipes 4, into individual sub-channels 3 '.
  • guide elements designed as deflection bodies 11 are introduced into the subchannels 3 '. These deflecting bodies have the shape of teeth projecting into the subchannels 3 '. The inner regions of the sub-channels 3 'remain here as well free. After emerging from the sub-channels 3 ', the individual mix
  • FIG. 7 and 8 show a further exemplary embodiment in which it can be seen in Fig. 7 that each partial channel 3 'formed by the core air cross 7 has been reduced to a partial channel cross section 3 "by a flow narrowing installation 12 as a guide element Widening 13, as clearly shown in Fig. 8, for an expansion of the cross section of each
  • Cross-sectional constriction bodies 12 may be circumscribed at all times as needed
  • cross-sectional constriction bodies 14 are again used which, unlike the previously described embodiment, are no longer arranged on the combustion chamber-side outlet but in front of the widening region 13 in the sub-channels 3 'formed by the core air cross 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

L'invention concerne un brûleur, notamment un brûleur radiant, destiné à brûler un combustible pulvérulent, notamment de la lignite, comprenant au moins un canal à combustible (3) muni d'une bouche orientée en direction d'une chambre de combustion et comprenant au moins une buse à air (1, 5, 6) orientée en direction de la chambre de combustion. Le combustible est insufflé dans la chambre de combustion à travers le canal à combustible (3) et le canal à combustible possède une section transversale rectangulaire. Pour briser partiellement les écheveaux de poussière de houille qui se produisent lors de l'utilisation, il faut imprimer un tourbillon et parvenir ainsi à un allumage précoce et une combustion plus complète du charbon, avec des valeurs d'émission encore plus faibles. L'effort de construction doit lui aussi être considérablement réduit en comparaison d'une construction entièrement neuve d'un brûleur. Cela est réalisé en ce qu'une pluralité d'éléments de guidage (10, 11, 12, 14) destinés à appliquer un courant au moins partiellement en rotation ou tourbillonnant sont disposés dans l'au moins un canal à combustible (3) et en ce que les éléments de guidage (10, 11, 12, 14) sont uniquement disposés dans la zone des parois du canal à combustible (3), de sorte qu'une zone intérieure (3') reste exempte d'éléments intégrés.
EP18704168.6A 2017-01-27 2018-01-29 Brûleur, notamment brûleur radiant pour lignite Withdrawn EP3574260A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017101670.8A DE102017101670A1 (de) 2017-01-27 2017-01-27 Brenner, insbesondere Braunkohle-Strahlbrenner
PCT/EP2018/052106 WO2018138323A1 (fr) 2017-01-27 2018-01-29 Brûleur, notamment brûleur radiant pour lignite

Publications (1)

Publication Number Publication Date
EP3574260A1 true EP3574260A1 (fr) 2019-12-04

Family

ID=61189422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18704168.6A Withdrawn EP3574260A1 (fr) 2017-01-27 2018-01-29 Brûleur, notamment brûleur radiant pour lignite

Country Status (3)

Country Link
EP (1) EP3574260A1 (fr)
DE (1) DE102017101670A1 (fr)
WO (1) WO2018138323A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114985127B (zh) * 2022-07-15 2022-11-01 中国空气动力研究与发展中心低速空气动力研究所 一种改变射流形状的方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3738064A1 (de) 1987-11-09 1989-05-24 Stubinen Utvecklings Ab Vorrichtung zum verbrennen fester brennstoffe, insbesondere kohle, torf oder dergleichen, in pulverisierter form
EP0655119B1 (fr) 1992-08-18 1997-05-14 Damper Design, Inc. Appareil et procede d'alimentation en combustible particulaire et en air de transport
CZ290627B6 (cs) * 1993-11-08 2002-09-11 Ivo International Oy Způsob a zařízení pro spalování práškového paliva
DE4407198A1 (de) 1994-03-04 1995-09-07 Lentjes Kraftwerkstechnik Braunkohlenbrenner
DE4416945C1 (de) 1994-05-13 1995-06-08 Steinmueller Gmbh L & C Verfahren zur Verbrennung von Braunkohle mittels eines Strahlbrenners, Strahlbrenner und Tangential-Feuerungsanlage
DE29520696U1 (de) 1995-12-29 1996-02-29 Deutsche Babcock Babcock Lentjes Kraftwerkstechnik GmbH Standort Berlin, 10407 Berlin Kohlenstaubbrenner
JP3099109B2 (ja) * 1996-05-24 2000-10-16 株式会社日立製作所 微粉炭バーナ
AU1389700A (en) * 1999-11-18 2001-05-30 Fortum Engineering Oy Method and apparatus for burning brown coal
EP1731832A1 (fr) 2005-06-11 2006-12-13 Vattenfall Europe Generation AG & Co. KG Arrangement d'un brûleur à jet pour la combustion du charbon pulvérisé dans une chambre de combustion à émission réduite de NOx
US7775791B2 (en) * 2008-02-25 2010-08-17 General Electric Company Method and apparatus for staged combustion of air and fuel
DE102011056655B4 (de) 2011-12-20 2013-10-31 Alstom Technology Ltd. Brenner zum Verbrennen eines staubförmigen Brennstoffes für einen Kessel mit Plasmazündbrenner

Also Published As

Publication number Publication date
DE102017101670A1 (de) 2018-08-02
WO2018138323A1 (fr) 2018-08-02

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