EP2009351B1 - Brûleur à charbon carbonisé destiné à l'allumage de combustible transporté dans un transport en phase dense - Google Patents

Brûleur à charbon carbonisé destiné à l'allumage de combustible transporté dans un transport en phase dense Download PDF

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Publication number
EP2009351B1
EP2009351B1 EP08158605A EP08158605A EP2009351B1 EP 2009351 B1 EP2009351 B1 EP 2009351B1 EP 08158605 A EP08158605 A EP 08158605A EP 08158605 A EP08158605 A EP 08158605A EP 2009351 B1 EP2009351 B1 EP 2009351B1
Authority
EP
European Patent Office
Prior art keywords
burner
fuel
primary air
pipe
air pipe
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.)
Not-in-force
Application number
EP08158605A
Other languages
German (de)
English (en)
Other versions
EP2009351A2 (fr
EP2009351A3 (fr
Inventor
Martin Ehmann
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.)
Hitachi Power Europe GmbH
Original Assignee
Hitachi Power Europe 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39743804&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2009351(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hitachi Power Europe GmbH filed Critical Hitachi Power Europe GmbH
Priority to PL08158605T priority Critical patent/PL2009351T3/pl
Priority to SI200830490T priority patent/SI2009351T1/sl
Publication of EP2009351A2 publication Critical patent/EP2009351A2/fr
Publication of EP2009351A3 publication Critical patent/EP2009351A3/fr
Application granted granted Critical
Publication of EP2009351B1 publication Critical patent/EP2009351B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • 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
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F23C7/006—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable

Definitions

  • the invention is directed to a burner, in particular pulverized coal burner, with a fuel delivery pipe and concentrically disposed therein primary air pipe, the primary air pipe outlet side ends at a distance from the mouth of the fuel delivery pipe and the burner is connected to a dust-like fuel in the dense stream promoting supply line or connectable. Furthermore, the invention is directed to a method for the combustion of particulate fuel, in particular pulverized coal, preferably dry lignite, in a burner with primary air pipe and fuel delivery pipe, wherein the burner fed the fuel in dense phase conveying and promoted in dense phase promotion within the burner along the burner longitudinal axis and mixed with combustion air ,
  • burners which in addition to a core air supply have a primary air, a secondary air and a tertiary air supply.
  • US 2002/0144636 A discloses such a burner.
  • Such burners are used in particular in connection with the firing of fireboxes of large steam generators.
  • the primary air, secondary air and tertiary air supply is in the form of concentrically arranged, annular conveyor cross-sections or concentric arrangements coaxially around a central core air tube, in which an oil burner lance or the like can be arranged, formed and arranged.
  • the dust-like fuel is usually together with the primary combustion air (primary air) in a primary air tube inside the burner to the burner mouth.
  • primary air primary air
  • this primary air pipe then disposed on the outside of the core casing tube swirler are provided, the imposition-the pulverized coal / primary air mixture a desired swirling, so that thereby the combustion in particular in view of a low NOx combustion of the fuel optimized, or at least improved.
  • These burners are usually used in plants in which the dust-like fuel is conveyed by means of a pneumatic conveying from the mill directly to the burner. This has the disadvantage that it works with low transport gas loads and high conveyor speeds. This leads to a large wear of the transport tubes.
  • the delivery pipes have relatively large dimensions (conveyor cross sections).
  • the fuel is indeed conveyed into a secondary air flow arranged circumferentially around the primary air flow in the radial direction.
  • this is done with a coiled delivery pipe of small cross-section, so that the fuel exits into the secondary air only in a small area of the secondary air promoting annular channel and consequently there is no uniform distribution of the dusty fuel over the cross section of the entire annular conveying channel of the secondary air.
  • the fuel is conveyed into the secondary air flow, so that an enrichment of the outer region of the primary air flow with fuel does not occur.
  • the invention has for its object to provide a solution that allows x-poor burner with a dense phase conveyance of the fuel to equip a container suitable for firing the furnace of a steam generator NO, without compromising the low NOx combustion performance of the burner.
  • this object is achieved in that the primary air tube is arranged concentrically in the fuel delivery pipe and the primary air outlet side outlet ends at a distance from the mouth of the fuel delivery tube, and that formed between the primary air tube and the fuel delivery tube fuel delivery chamber with the burner dust-like fuel in the dense stream feeding supply line is connected or connected and the fuel delivery chamber has a dense phase conveying the fuel.
  • this object is achieved in that the fuel is conveyed within the burner in a radially outside of a primary air duct formed annular gap channel-shaped fuel delivery and the fuel stream after exiting the fuel delivery within the fuel delivery tube exiting from the primary air line primary air flow mixed becomes.
  • annular gap channel is formed and provided in which the pulverized fuel, in particular dry lignite dust, is conveyed in the burner along the longitudinal axis of the burner until just before the outlet-side opening region of the burner.
  • This annular gap channel is concentrically arranged circumferentially around the primary air flow around.
  • the primary air flow is now further twisted, for which swirl body are arranged and formed in the primary air flow at a suitable point, so that it mixes with the conveyed in dense phase promotion fuel at the end of the annular gap-shaped conveying channel, thereby characterized at the outlet end of the burner to Brennungsraum circumferentially the radially outer region of the primary air flow is enriched evenly with the fuel, or is located exclusively in this area fuel.
  • this measure so quasi promoted only in the outer peripheral region of the primary air flow fuel in dense phase conveying. This does not affect the low NO x combustion characteristics of the respective burner, on the contrary, they are supported, promoted and optimized.
  • a core air tube is arranged in the core air tube.
  • an oil burner lance or the like as is known from conventional burners.
  • the invention further characterized by the fact that the radial distance between the core air tube and the primary air pipe is greater than the radial distance between primary air pipe and fuel delivery pipe.
  • the invention therefore further provides that a plurality of swirl bodies, preferably distributed in the form of a blade ring, are arranged distributed radially on the outside surface of the core air tube, radially on the outside in the annular gap to the primary air tube.
  • the burner according to the invention is also equipped with a ⁇ lbrennerzündlanze, which is why according to the embodiment of the invention coaxial in Core air tube is an ignition lance, in particular a ⁇ lbrennerzündlanze arranged.
  • the invention is therefore further characterized by a secondary air supply surrounding the fuel delivery pipe and a tertiary air supply surrounding the secondary air supply.
  • a radially inwardly extending stabilizing ring is arranged at the combustion chamber mouth-side end of the fuel conveying tube.
  • the method according to the invention initially provides that the primary air is admixed with the fuel stream in the mouth region of the burner in a mixing chamber before exiting into the combustion chamber.
  • This provides the opportunity to use the geometry of existing burners and intensive mixing of primary air and dust-like fuel to generate NO x combustion.
  • the burner is supplied as the primary air, in particular heated air, recirculated flue gas or a mixture of air and recirculated flue gas.
  • the burner 1 discharges on the outlet side into the combustion chamber or the combustion chamber 2 of a steam generator and is arranged in its peripheral wall.
  • the burner 1 has a central, arranged along its longitudinal axis 3 ⁇ lbrennerzündlanze 4. This is arranged in the center of a ⁇ lbrennerzündlanze 4 coaxially surrounding core air tube 5.
  • the fuel delivery pipe 7 is arranged concentrically around the ⁇ lbrennerzündlanze 4 and the core air tube 5 and forms the outer circumferential surface of a primary air pipe 9 and after the end to the combustion chamber 2 toward the outer surface of the core air tube 5 each have an annular gap-shaped conveying cross section.
  • an air deflector throat 8 extending over the entire circumference of the fuel delivery pipe 7 is formed on the outside.
  • a stabilizing ring 14 provided with teeth extends radially inwards into the delivery cross section of the fuel delivery pipe 7 and forms the end of the fuel delivery pipe 7 at this location.
  • the Core air tube 5 ends burner inside with a distance to the combustion chamber outlet side muzzle end of the fuel conveying tube 7 in the region of the louver 6.
  • the primary air tube 9 is arranged coaxially with the core air tube 5 and the fuel delivery tube 7, so that a fuel delivery chamber 13 with an annular cross-section is formed.
  • the combustion chamber 2 facing the mouth end of the primary air pipe 9 terminates at a distance from the burner outlet side mouth ends of both the core air tube 5 and the fuel delivery pipe 7, so that the burner inside a mixing cross-section or mixing chamber 10 is formed.
  • the mouth-side end of the primary air tube 9 is located approximately in the region of the arrangement of low NO x burners usually provided in the primary air flow swirlers 15.
  • the primary air pipe 9 extends far into the burner 1 in that its mouth-side end in the positioning range of adjustable Swirl bodies 11, 12 are arranged, which are located in a secondary air supply 19 and a tertiary air supply 20.
  • the primary air pipe 9 is further arranged relative to the core air pipe 5 and fuel delivery pipe 7 so that its radial distance to the core air tube 5 is greater than the fuel delivery pipe 7. Between the outside of the primary air pipe 9 and the inside of the fuel delivery pipe 7 thus the annular gap-shaped fuel delivery chamber 13 is formed.
  • This annular fuel delivery chamber 13 is provided with a not shown supply line connected or connectable, with which fuel pneumatically fed in dense phase conveying the burner 1 and then also in the fuel delivery chamber 13 is pneumatically conveyed in the dense stream.
  • the fuel is particulate fuel, in particular pulverized coal, preferably pulverulent dry lignite.
  • the dense phase conveying takes place with a load of 20-90 kg of dust / kg conveying gas and a conveying speed of 3 to 20 m / s at pressures ⁇ 10 bar.
  • the radial distance between the outside of the primary air tube 9 and the inside of the fuel delivery tube 7 and thus the gap height of the fuel delivery or fuel delivery 13 may be approximately as long as the length of the teeth of the stabilizing ring 14 radially inwardly toward the burner axis. 3 extend.
  • the primary air may be air, in particular preheated air, but also recirculated flue gas or a mixture of recirculated flue gas and air.
  • the primary air conveyed through the primary air duct 18 with a circular gap-shaped conveying cross-section is set into a twisted flow when emerging by means of an adjustable swirl body 15 arranged on the inside end on the primary air pipe 9 between the core air pipe 5 and the primary air pipe 9.
  • the swirl body 15 are in the form of a blade ring evenly distributed on Outer circumference of the core air tube 5 arranged guide vanes formed.
  • the burner 1 as known from conventional burners ago, outside coaxially disposed around the fuel delivery pipe 7, a secondary air pipe 16 and therefore in turn coaxially on the outside with spaced a tertiary air pipe 17 on.
  • the combustion chamber is supplied through the tertiary air pipe 17 2 tertiary air is supplied to the combustion chamber as x-poor of known burners for generating a multi-stage combustion NO is known.
  • the respective swirl bodies 15, 11 and 12 arranged therein are adjustable. But it is also possible to form the swirler 15, 11 and / or 12 respectively immovable.
  • pulverized coal is conveyed pneumatically in dense phase conveying along the burner axis 3 within the burner 1 by the fuel delivery chamber 13.
  • This fuel delivery chamber 13 is located radially outside of the primary air line 18 formed by the interior of the primary air tube 9 and the outer circumferential surface of the core air tube 5, is conveyed by the primary air.
  • the supplied primary air is swirled at the outlet region of the primary air line 18 and the primary air flow cross-section by means of swirl body 15 and mixes with the fuel flow chamber 13 leaving dense stream of fuel.
  • the above embodiment is a construction with a centrally located pilot burner, it is also possible to provide burners constructed without core air supply and pilot burners. The necessary geometric conditions then arise depending on the burner design. According to the invention, it is only important that, with respect to the longitudinal axis of the burner, primary air is conveyed centrally on the inside in a primary air tube, and then it is twisted radially outward Primary air flow is added in the dense stream funded fuel stream.

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

Claims (13)

  1. Brûleur, en particulier brûleur à charbon pulvérisé (1), comprenant un tube de transport de combustible (7) et un tube d'air primaire (9), dans lequel l'intérieur du tube d'air primaire (9) est ou peut être raccordé à un conduit d'admission d'air primaire (18) et le brûleur (1) est ou peut être raccordé à un conduit d'admission pour le transport du combustible pulvérulent en phase dense,
    caractérisé en ce que
    le tube d'air primaire est positionné concentriquement dans le tube de transport de combustible, le tube d'air primaire (9) se terminant du côté de son extrémité de sortie à distance de l'orifice d'extrémité du tube de transport de combustible (7) et en ce que le compartiment de transport de combustible (13) formé entre le tube d'air primaire (9) et le tube de transport de combustible (7) peut être ou est raccordé au conduit d'admission pour le transport du combustible pulvérulent en phase dense vers le brûleur (1) et en ce que le compartiment de transport de combustible (13) présente un transport en phase dense du combustible.
  2. Brûleur selon la revendication 1, caractérisé en ce qu'au moins un dispositif tourbillonneur (15) est aménagé à l'intérieur du tube d'air primaire (9).
  3. Brûleur selon la revendication 1 ou 2, caractérisé en ce qu'un tube d'air noyau (5) est positionné concentriquement au tube d'air primaire à l'intérieur de celui-ci (9).
  4. Brûleur selon la revendication 3, caractérisé en ce que la distance radiale entre le tube d'air noyau (5) et le tube d'air primaire (9) est supérieure à la distance radiale entre le tube d'air primaire (9) et le tube de transport de combustible (7).
  5. Brûleur selon la revendication 3 ou 4, caractérisé en ce que le tube d'air noyau (5) dépasse, dans le sens de son axe longitudinal, l'extrémité de sortie du tube d'air primaire (9), s'étendant jusque dans la zone de l'orifice d'extrémité de sortie du tube de transport de combustible (7).
  6. Brûleur selon l'une quelconque des revendications 3 à 5, caractérisé en ce que plusieurs dispositifs tourbillonneurs (15) sont disposés, radialement au côté externe du tube d'air primaire (9), dans son interstice annulaire, de préférence positionnés sur la face externe du tube d'air noyau (5) en se répartissant sur sa circonférence sous la forme d'une couronne d'aubes.
  7. Brûleur selon l'une quelconque des revendications 3 à 6, caractérisé en ce qu'une lance d'allumage, en particulier une lance d'allumage de brûleur à fioul (4), est positionnée coaxialement à l'intérieur du tube d'air noyau (5).
  8. Brûleur selon l'une quelconque des revendications précédentes, caractérisé par un conduit d'admission d'air secondaire (19) entourant le tube de transport de combustible (7).
  9. Brûleur selon la revendication 8, caractérisé par un conduit d'admission d'air tertiaire (20) entourant le conduit d'admission d'air secondaire (19).
  10. Brûleur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au niveau de l'extrémité du tube de transport de combustible (7) situé du côté de la chambre de combustion est positionné un anneau de stabilisation (14) s'étendant radialement vers l'intérieur.
  11. Procédé de combustion de combustible particulaire, en particulier de charbon pulvérisé, de préférence de lignite séchée, dans un brûleur (1) avec un tube d'air primaire (9) et un tube de transport de combustible (7), dans lequel le combustible est transporté en phase dense vers le brûleur (1) et transporté, par transport en phase dense à l'intérieur du brûleur (1), le long de l'axe longitudinal (3) du brûleur et mélangé à l'air de combustion,
    caractérisé en ce que
    le combustible est transporté, à l'intérieur du brûleur (1), dans un compartiment de transport de combustible (13) ayant la forme d'un interstice annulaire formant canal et se situant radialement à l'extérieur d'un conduit d'admission d'air primaire (18) et en ce que le courant d'air primaire sortant du conduit d'admission d'air primaire (18) est mélangé en tourbillon au flux de combustible après sortie du compartiment de transport de combustible (13) à l'intérieur du tube de transport de combustible (7).
  12. Procédé selon la revendication 11, caractérisé en ce que l'air primaire est mélangé au flux de combustible dans la zone d'extrémité du brûleur (1), dans un compartiment de mélange (10), avant sa sortie vers la chambre de combustion (2).
  13. Procédé selon la revendication 11 ou 12, caractérisé en ce que l'air primaire acheminé vers le brûleur (1) est de l'air, en particulier de l'air chauffé, du gaz de combustion recyclé ou un mélange d'air et de gaz de combustion recyclé.
EP08158605A 2007-06-28 2008-06-19 Brûleur à charbon carbonisé destiné à l'allumage de combustible transporté dans un transport en phase dense Not-in-force EP2009351B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL08158605T PL2009351T3 (pl) 2007-06-28 2008-06-19 Palnik na pył węglowy do zapłonu paliwa dostarczanego gęstym strumieniem
SI200830490T SI2009351T1 (sl) 2007-06-28 2008-06-19 Gorilnik na premogov prah za kurjenje goriva, dovedenega v transportu goste faze

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007030269.1A DE102007030269B4 (de) 2007-06-28 2007-06-28 Kohlenstaubbrenner zur Verfeuerung von in Dichtstromförderung zugeführtem Brennstoff

Publications (3)

Publication Number Publication Date
EP2009351A2 EP2009351A2 (fr) 2008-12-31
EP2009351A3 EP2009351A3 (fr) 2009-11-04
EP2009351B1 true EP2009351B1 (fr) 2011-09-21

Family

ID=39743804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08158605A Not-in-force EP2009351B1 (fr) 2007-06-28 2008-06-19 Brûleur à charbon carbonisé destiné à l'allumage de combustible transporté dans un transport en phase dense

Country Status (12)

Country Link
US (1) US20090000532A1 (fr)
EP (1) EP2009351B1 (fr)
JP (1) JP2009024991A (fr)
CN (1) CN101334166A (fr)
AT (1) ATE525615T1 (fr)
AU (1) AU2008202470B2 (fr)
CA (1) CA2632412A1 (fr)
DE (1) DE102007030269B4 (fr)
PL (1) PL2009351T3 (fr)
RU (1) RU2008123264A (fr)
SI (1) SI2009351T1 (fr)
ZA (1) ZA200805541B (fr)

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Also Published As

Publication number Publication date
US20090000532A1 (en) 2009-01-01
EP2009351A2 (fr) 2008-12-31
SI2009351T1 (sl) 2012-01-31
JP2009024991A (ja) 2009-02-05
RU2008123264A (ru) 2009-12-27
AU2008202470A1 (en) 2009-01-15
ZA200805541B (en) 2009-12-30
DE102007030269B4 (de) 2014-07-17
EP2009351A3 (fr) 2009-11-04
DE102007030269A1 (de) 2009-01-02
PL2009351T3 (pl) 2012-02-29
CN101334166A (zh) 2008-12-31
CA2632412A1 (fr) 2008-12-28
ATE525615T1 (de) 2011-10-15
AU2008202470B2 (en) 2010-10-28

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