DK156094B

DK156094B - PROCEDURE AND BURNING TO CREATE A ROTATING CARBON FLAME

Info

Publication number: DK156094B
Application number: DK492581A
Authority: DK
Inventors: Wolfgang Schuster; Karl-Heinz Gillner; Werner Hoffmann; Hans Iser; Paul Bernhoeft; Guenter Riedel
Original assignee: Leipzig Dampfautomat
Priority date: 1980-11-12
Filing date: 1981-11-09
Publication date: 1989-06-19
Also published as: CS651081A1; IT8149669A0; DE3144056A1; BE891073A; IN155690B; PL233787A1; RO84273A; IT1172054B; DK492581A; NL8104232A; BG40917A1; HU191338B; DD153911A1; FR2493961B1; DK156094C; RO84273B; SE8106705L; CH658508A5; FR2493961A1

Description

DK 156094 BDK 156094 B

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Opfindelsen angâr en fremgangsmâde og en brænder til frembringelse af en roterende kulst0vf lamme i stærkt k01ede forbrændingskamre i industrielle varmefrembringelsesanlæg, navnlig i smâ darapgeneratorer.The present invention relates to a method and burner for producing a rotary carbon dioxide lamb in highly boiled combustion chambers in industrial heat generating plants, especially in small-scale generators.

Til frembringelse og opretholdelse af en stabil kulst0vflamme i 5 snævre forbrændingskamre med kort forbrændingsvej, hvilket er ensbety-dende med kort forbrændingstid, er det kendt at sikre reaktionstempera-turen ved tændingshjælp i form af ophedede udforinger, broer, skakter, forkoblingsindretninger osv. {DE-offentligg0relsesskrift 27 33 519).For generating and maintaining a stable carbon flame in 5 narrow combustion chambers with a short combustion path, which is equivalent to a short combustion time, it is known to ensure the reaction temperature of ignition aids in the form of heated recesses, bridges, shafts, ballasts etc. -publication letter 27 33 519).

Ulemperne ved de nævnte fremgangsmâder og indretninger bestâr i, 10 at der kræves store forbrasndingsrum og dyre og for slid udsatte forkoblingsindretninger og/eller indbygninger i forbrændingsrummet, hvilket ikke eller kun med h0je omkostninger muligg0r en anvendelse navnlig ved flammer0rdampgeneratorer med lille effekt.The disadvantages of said methods and devices are that large combustion chambers and expensive and wear-prone ballasts and / or housings in the combustion chamber are required, which do not, or only at high cost, make it possible to use especially in the case of low-power flame-earth steam generators.

Pâ den anden side er brændere og fremgangsmâder til frembringelse 15 af roterende flammer til snævre og stærkt afk01ede forbrasndingsrum al-mindelig kendt, men disse brændere kan kun drives med gasforraige eller flydende brændsler.On the other hand, burners and methods for generating rotary flames for narrow and highly cooled combustion chambers are generally known, but these burners can only be operated with gas-fired or liquid fuels.

Opfindelsen har til formâl at udvide anvendelsesomrâdet for faste brændsler til sâdanne industrielle varmefrembringelsesanlaeg, fortrins-20 vis flammer0rdampgeneratorer, som hidtil var forbeholdt olie- og gas-styring, og navnlig at erstatte fyringsolie og brændgas i eksisterende varmefrembringelsesanlæg med st0vformet fast brændsel.The invention has for its purpose to extend the scope of solid fuels to such industrial heat generating plants, preferably flame steam generators previously hitherto reserved for oil and gas control, and in particular to replace heating oil and fuel gas in existing heat generating plants with dust form.

Opfindelsens opgave bestâr i at udvikle en fremgangsmâde og en brænder til frembringelse af roterende kulst0vflammer med h0j reak-25 tionshastighed og smâ forbrændingstider til snævre og stærkt k01ede forbrændingsrum ved tilf0rsel af brændselsst0v af den mest forskellige art.The object of the invention is to develop a method and burner for generating high reaction rate rotary carbon flames and small combustion times for narrow and highly boiled combustion compartments by supplying fuel dust of the most different kind.

If01ge opfindelsen 10ses opgaven ved, at der til et forbrændingsrum tilf0res forbrændingsluft med stuetemperatur samtidig, bâde ved 30 hjælp af en aksial primærluftstr0m - som lades med brændselsst0v af et vilkârligt fast brændsel med et fugtighedsindhold indtil grænsen for transporterbarhed - og ved hjælp af sekundærluft, som i koncentrisk an-bragte enkeltstrâler f0res tangentialt ind i forbrændingskammeret under en spids vinkel med stor hastighed, og som frembringer en ensartet ro-35 terende flamme, som brænder uden st0ttefyring eller anden tændhjælp.According to the invention, the task is seen by supplying combustion air at room temperature simultaneously, both by means of an axial primary air stream - which is charged with fuel dust of any solid fuel with a moisture content up to the limit of transportability, and by secondary air in concentrically disposed single jets are introduced tangentially into the combustion chamber at an acute angle at high velocity, producing a uniform rotating flame which burns without support firing or other ignition aid.

DK 156094 BDK 156094 B

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Forbrændingen drives uden st0ttefyring, bortset fra den indledende an-tænding, og flamraens varmeydelse kan reguleres indenfor vide grænser ved ændring af primærluft-brændselsst0vblandingens hastighed og/eller brændstoffyldning.The combustion is operated without auxiliary firing, except for the initial ignition, and the heat output of the flame can be controlled within wide limits by changing the speed and / or fuel filling of the primary air-fuel dust mixture.

5 Brænderen bestâr af et indre r0r til tilf0rsel af primærluften og en dette r0r omsluttende ringkanal til sekundærluften, et luftledeap-parat og en diffusor, og den er til ud0velse af fremgangsmâden karakte-riseret ved, at indf0ringen af sekundærluften sker via en indsnævning, og at bâde den tangentiale sekundaerluftudgang fra luftledeapparatet og 10 primærluftudgangen fra det indre r0r samt diffusorindgangen er anbragt i et plan. Indsnævringen af den ydre ringkanal f0rer hen til indgangen til luftledeapparatet.The burner consists of an inner tube for supplying the primary air and a ring duct enclosing the secondary air, an air conduit and a diffuser, and it is characterized in that the method of introducing the secondary air is via a narrowing, and both the tangential secondary air outlet from the air conduit and the primary air outlet from the inner tube as well as the diffuser inlet are arranged in a plane. The narrowing of the outer annular duct leads to the entrance to the air conductor.

Til brænderen tilf0res gennem en r0rledning primærluft-brændsels-st0vblanding og gennem en yderligere ledning sekundærluft.The burner is supplied through a pipeline of primary air-fuel-dust mixture and through an additional line of secondary air.

15 Sekundærluften træder gennem ledeapparatets ledeindretninger tan- gentialt med h0j hastighed ind i forbrændingsrummet og bevirker en ro-terende str0mning med udpræget indre recirkulationszone, hvorved der opstâr en intensiv blanding af brændsel og forbrændingsluft. Derved for0ges forbrændingens reaktionshastighed, sâ at der opstâr en kompakt 20 roterende kulst0vflamme med h0j energitæthed og korte udbrændingstider.15 Secondary air enters the combustion chamber through the guiding devices at a high speed, and causes a rotating flow with a pronounced internal recirculation zone, resulting in an intensive mixture of fuel and combustion air. This increases the combustion reaction rate to produce a compact, high energy density 20 rotary carbon dust flame and short combustion times.

Et udf0relsesekserapel for en brænder if01ge opfindelsen er skema-tisk vist pâ tegningen.An embodiment of a burner according to the invention is schematically shown in the drawing.

I brænderens indre findes et r0r 1 til tilf0rsel af primærluft--brændselsst0vblandingen, som ved ikke viste midler oparbejdes i en 25 luftstr0m.In the interior of the burner there is a tube 1 for supplying the primary air - the fuel dust mixture, which is worked up in a 25 air stream by means not shown.

Gennem en r0ret 1 omgivende ringkanal 2 tilf0res sekundærluften gennem en indsnævring 3 til et ledeapparat 4, Den fra ledeapparatet 4 tangentialt udtrædende sekundærluft f0res gennem en diffusor 5 ind i forbrændingsrummet. Sekundærluftmængden reguleres ved hjælp af spjæld 30 6. R0ret 1 er med en flange 8 fastgjort ved ringkanalen. Hele brænderen fastg0res ved hjælp af en fastg0relsesflange 7 pâ en ikke vist, kendt dampgenerators forbrændingsrum.Through an annular ring duct 2 surrounding the pipe 1, the secondary air is fed through a constriction 3 to a conductor 4, the secondary air exiting tangentially from the conductor 4 through a diffuser 5 into the combustion chamber. The secondary air flow rate is regulated by means of damper 30 6. The pipe 1 is fixed with a flange 8 by the annular duct. The entire burner is secured by means of a fixing flange 7 to a combustion chamber not shown, not shown.

Med 10sningen if01ge opfindelsen er det muligt at anvende brænd-selsst0v i automatisk drift ved industrielle varmefrembringelsesanlæg 35 med lille effekt. En særlig fordel er, at sâdanne varmefrembringelses-With the invention in accordance with the invention, it is possible to use fuel dust in automatic operation at low heat industrial heat generating plants 35. A particular advantage is that such heat generation

DK 156094 BDK 156094 B

- 3 - anlôeg kan ombygges fra fyring med olie eller brændgas til fyring med brændselsst0v, sâledes at kostbare energistoffer frig0res og en dyr import bortfalder.- 3 - plants can be rebuilt from burning with oil or fuel to firing with fuel dust, releasing precious energy substances and costly imports.

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Claims

A method of producing a rotary carbon dust flame, preferably in flame-earth vapor generators with strongly boiled, own combustion chambers, the heat effect of which is controlled by changing the fuel supply, characterized in that a combustion chamber is supplied with a combustion chamber with a combustion chamber. by means of an axial primary air stream - which is charged with fuel dust of any solid fuel with a moisture content up to the limit of transportability - and by means of secondary air which, in concentrically placed single jets, is introduced tangentially into the combustion chamber at a high angle of velocity. , which produces a uniform rotary flame which burns without support firing or other ignition assistance.

A carbon swirl burner for performing the method according to claim 1, comprising an inner tube (1) for supplying the primary air and an annular duct (2) for the secondary air, an air duct apparatus (4) and a diffuser (5), characterized in that the introduction of the secondary air takes place via a narrowing (3) and that both the tangential secondary air output from the air conduit (4) and the primary air output from the inner tube (1) as well as the diffuser inlet are arranged in one plane.

A pulley swirl burner according to claim 2, characterized in that the constriction (3) of the outer annular channel (2) leads to the entrance to the air conduit (4). 25