SE200280C1

SE200280C1 -

Info

Publication number: SE200280C1
Authority: SE
Publication date: 1965-01-01

Description

KLASS I NTERNATIONELLSVENSK C 21 b18a:9/02 PATENT- OCH REGISTRERI NGSVERKET Ans. 3088/1963 inkom den 21/3 1963 utlagd den 8/3 196 D PETIT, PARIS, FRANKRIKE Brannaranordning for utan forbranningssehakt arbetande luftforvarmare enligt eowpersystemet for masugnar Prioritet begard Iran den 22 mars 1962 (Storbritannien) Vid utan fOrbranningsschakt arbetande luftforvarmare sker forbranningen av uppvarmningsgasen i kupolen. Bet är kant, att inf8ra upvarmningsgasen och forbranningsluften i kupolens topp eller i sidled genom kupolen. Det har emellertid darvid befunnits, att man icke kan uppna en fullstandig forbranning av uppvdrmningsgasen i kupolen och att fOrbranningen ofta fortsatte i gallerverkets ovre gangar, vilket ledde till en snabb forstoring av detsamma. Dessutom var fOrdelningen av den f8rbranda gasen pa gallerverket icke likformig. Enligt ett lard fOrslag har man dad& forsOkt att undvika de omtalade olagenheterna darigenom, att man latit uppvarmningsgasen och f8rbranningsluften instr5mma var for sig vid kupolens undre kant ningen av den forbranda gasen pa gallerverfor att darigenom forlanga uppvarmningsgasens forbranningsvag. lake heller detta for-slag har dock varit i stand att hjalpa den i och for sig fordelaktiga, utan forbranningssehakt arbetande luftforvarmaren till en mera vidstrackt anvandning. Samma negativa resultat hade ett annat ferut kant forslag, Damligen att Tata brannarna inmynna tangentiellt I en vagratt ringkanal mellan gallerverket och kupolen, varigenom kupoldiametern okades avsevart utan nytta. CLASS IN NTERNATIONAL SWEDISH C 21 b18a: 9/02 PATENT AND REGISTRATION AGENCY Ans. 3088/1963 was received on 21/3 1963 on 8/3 196 D PETIT, PARIS, FRANCE Burner device for air preheaters operating without combustion shaft according to the eowper system for blast furnaces Priority requested Iran on 22 March 1962 (Great Britain) in the dome. Bet is edge, to introduce the heating gas and the combustion air into the top of the dome or laterally through the dome. However, it has been found that a complete combustion of the heating gas in the dome cannot be achieved and that the combustion often continued in the upper passages of the grid, which led to a rapid enlargement of the same. In addition, the distribution of the combustion gas on the grid was not uniform. According to a previous proposal, an attempt has been made to avoid the mentioned illegalities by allowing the heating gas and the combustion air to flow separately at the lower edge of the dome of the combusted gas on the grid, thereby extending the combustion gas of the heating gas. nor has this proposal been able, however, to help the in itself advantageous, non-combustion-operated air preheater to a more extensive use. The same negative result had another ferut edge suggestion, Damligen that the Tata fires end tangentially in a horizontal ring channel between the grid and the dome, whereby the dome diameter was increased considerably to no avail.

Enligt ett annat forslag aro brannarna inforda fran sidan i kupolen och brannaraxelns riktning bildar en vinkel med kupolradien. Aven harvid sker gasens forbranning i kupolen. Dessutom giva brannaroppningarna, Oppningarna for forvarmningsluften och oppningarna for observation och kontroll i kupolen en orsak till uppkomsten av sprickbildning i kupolen. According to another proposal, the burners are introduced from the side into the dome and the direction of the burner shaft forms an angle with the dome radius. The gas is also burned in the dome. In addition, the fire openings, the openings for the preheating air and the openings for observation and control in the dome give a reason for the occurrence of crack formation in the dome.

Foreliggande uppfinning avser ett anordnande av brannarna vid utan forbranningsschakt arbetade luftfOrvarmare, vilket an ordnande undviker de forut framlagda f8rslagens olagenheter och samtidigt tillater, att de utan forbrdnningsschakt arbetande luftforvarmarna anvandas upp till kupoltemperaturer om 1600° C. Uppfinningen bestir dari, att brannarna aro anordnade vid den yttre anden av tunnelartade forbranningskamrar, som med hela sin langd utskjuta fran luftforvarmarens platmantel och aro hopbyggda med en av nlatmanteln avstOdd ring av eld= fasta stenar, vilken är skild fran luftfOrvarmarens mantelmurverk och uppbar den utan oppning utf6rda kupolen. Harvid tjanar kupolen icke langre sasom forbranningsrum, utan endast till att astadkomma en likformig fordelning av de fiirbranda uppvarmningsgaserna pa hela gallerverket. Forbranningskamrarna enligt uppfinningen utvidgar sig i riktning mot kupolen, sa att en sugverkan frail den frill fOrbranningskamrarna till kupolen strOmmande, redan forbranda gasen tvars mot stromningsriktningen undvikes. Den likformiga fordelningen av den forbranda gasen pa gallerverket understodjes genom den i och fOr sig kanda atgarden, att man later uppvarmningsgasen instromma tangentiellt i kupolen och snett uppat. The present invention relates to an arrangement of the burners in air preheaters operated without a combustion shaft, which arrangement avoids the disadvantages of the previously presented proposals and at the same time allows the air preheaters operating without a combustion shaft to be used up to dome temperatures of 1600 ° C. the outer spirit of tunnel-like combustion chambers, which with their entire length project from the plate mantle of the air preheater and are built together with a ring of fire = solid stones remote from the mantle mantle, which is separate from the mantle wall of the air preheater and supported the dome. In this case, the dome no longer serves as a combustion chamber, but only to achieve a uniform distribution of the combustion heating gases over the entire grid. The combustion chambers according to the invention expand in the direction of the dome, so that a suction effect from the free combustion chambers flowing to the dome, already combusted gas transverse to the flow direction is avoided. The uniform distribution of the combusted gas on the grid is supported by the per se known procedure, that the heating gas is allowed to flow in tangentially into the dome and obliquely upwards.

Uppfinningen kommer att f8rklaras narmare i det foljande med hanvisning till bifogade riffling. The invention will be explained in more detail in the following with reference to the accompanying corrugation.

Gallerverket 1 omgives pa normalt sätt av mantelmurverket 2 och stdiplatsmanteln 3. Den utan Oppning utf8rda kupolen 4, exempelvis a-v silicastenar, vilka kan utvidga och sammandraga sig fritt inuti stalplatskkpan 5, vilar pa en ring 6 av eldfasta stellar, i vilken samtliga erforderliga oppningar, sasom utloppet 7 for f8rvarmningsluften, manhal osv., aro upptagna. Ringen uppbares pa i och for sig kant satt av ett utsprang hos platmanteln 3 och 0,3-0,5 In djup. Med ringen 6 dr for 2— — varje brannare sammanbyggd en tunnelartad forbranningskammare 8, vilka kamrar skjuta utanfor ringen till nasta hela sin langd. Vid den yttre anden av varje forbranningskammare ãr anordnat ett brarmarhus 9 med en tilledning 10 for upphettningsgasen och en tilledning 11 far forbraninngsluften. Sisom brannare kan man anvanda varje i och for sig kand brannare, med eller utan forvarmd forbranningsluft. Vid forvarmd fOrbränningsluft fir del lampligt att anvanda brannare med en keramisk dysa. Forbranningskammaren har ett i riktning mot kupolen tilltagande tvarsnitt, som är starst vid inloppet i kupolen. Darigenom undvikes, att ett tvardrag uppkommer vid upphettningsgasens inlopp i kupolen, vilket skulle kunna stara den likformiga fOrdelningen av upphettningsgasen pa gallerverket. Dessutona är forbranningskammarens- utlopp sa utformat, att upphettningsgasen pa i och for sig kant satt inkommer i kupolen tangentiellt och dessutom riktad smelt uppat i kupolen. Harigenom kommer forbranningsgasen att patvingas en cirkulerande rorelse i kupolen, sa att upphettningsgasen fordelas likformigt Over hela gallerverket. The grid 1 is normally surrounded by the mantle masonry 2 and the supporting plate mantle 3. The dome 4 made without opening, for example of silica stones, which can expand and contract freely inside the steel plate cupboard 5, rests on a ring 6 of refractory frames, in which all required openings, such as the outlet 7 for the preheating air, manhole, etc., are occupied. The ring is supported on the per se edge set by a projection of the plate jacket 3 and 0.3-0.5 in depth. With the ring 6 dr for 2— - each burner assembled a tunnel-like combustion chamber 8, which chambers project outside the ring to almost its entire length. At the outer spirit of each combustion chamber is arranged a burner housing 9 with a supply 10 for the heating gas and a supply 11 for the combustion air. As a burner, each burner can be used separately, with or without preheated combustion air. In the case of preheated combustion air, it is advisable to use a burner with a ceramic nozzle. The combustion chamber has an increasing cross-section in the direction of the dome, which is strongest at the inlet in the dome. This avoids that a transverse draft arises at the inlet of the heating gas in the dome, which could disturb the uniform distribution of the heating gas on the grid. In addition, the outlet of the combustion chamber is designed in such a way that the heating gas on its own edge enters the dome tangentially and also directs melt up into the dome. As a result, the combustion gas will be forced into a circulating movement in the dome, so that the heating gas is distributed uniformly over the entire grid.

Uppfinningen gar del mojligt att driva utan forbranningsschakt arbetande luftforvarmare med forvarmd forhranningsluft och darmed lufttemperaturer upp till 1400° C, varigenom erhalles en motsvarande inbesparing av koks I masugnen. En ytterligare ftirdel ar den, att brannarna skyddas mot direkt varmestralning fran kupolen. A den andra sidan skyddas kupolen fran direkt beraring ay flammorna frau brannarna, enar fran forbranningskamrarna till kupolen inkomma endast fullstandigt forbranda gaser. Harigenom blir kupolen likformigt uppvarmd och spanningar i kupo- len undvikas, vilka annars skulle upptrada till MIN av olikformig upphettning och da fororsaka sprickbildning. The invention makes it possible to operate air preheaters operating without a combustion shaft with preheated preheating air and thus air temperatures up to 1400 ° C, whereby a corresponding saving of coke is obtained in the blast furnace. An additional advantage is that the fires are protected against direct heat radiation from the dome. On the other hand, the dome is protected from direct contact with the flames from the burners, only from the combustion chambers to the dome only completely combusted gases enter. As a result, the dome is uniformly heated and stresses in the dome are avoided, which would otherwise occur to MIN due to non-uniform heating and then cause cracking.

Claims

Patent claim:

Burner device for air heater operating without a combustion shaft according to the cowper system for blast furnaces, characterized in that the burners (9) are arranged with the outer spirits of tunnel-like combustion chambers (8), which extend their entire length outside the air jacket (3) a ring (6) attached to the plate jacket on refractory stones, which ring is separate from the air heater's mantle masonry (2) and supported it without openings challenging, sponge hat-shaped dome (4).

Device according to patent claim 1, characterized in that the combustion chambers have a cross-section which increases in the direction of the dome.

Device according to claim 1 or 2, characterized in that the axis lines of the combustion chambers arc directed obliquely upwards into the dome.

4. A device according to any one of claims 1-3, characterized in that the combustion chambers open tangentially in the dome. Request publications: Patents frein France 1,087,076; Germany 863 663, 927 094; USA 749502.