Joel Vatksy-Foster Wheeler-1988-Controlled Flow, Split Stream Burner Assembly With Sorbent Injection

8/12/2019 Joel Vatksy-Foster Wheeler-1988-Controlled Flow, Split Stream Burner Assembly With Sorbent Injection

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Europaisches Paten tamt

European Patent Office

Office europeen des brevets

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B 1

Publication number:

EUROPEAN PATENT SPECIFICATION

Intel.4: F 23 D 1/00, F 23 J 7/00ate of publication of patent specification : 17.08.88

Application number: 85302979,1

Date of filing: 26.04.85

(3) Controlled flow, split stream burner assembly with sorbent injection.

Proprietor: FOSTER WHEELER ENERGYCORPORATION110 South Orange AvenueLivingston New Jersey 07039 (US)

Priority: 27.04.84 US 604706

Date of publication of application:04.12.85 Bulletin 85/49

Inventor: Vatsky,Joel110 South Orange AvenueLivingston New Jersey 07039 (US)

Publication of the grant of the patent:17.08.88 Bulletin 88/33

Representative: Bowman, Paul Alan et alLLOYD WISE, TREGEAR & CO. Norman House105-109 StrandLondon WC2R OAE (GB)

Designated Contracting States:DEGBITSE

References cited:DE-A-2932676US-A-4400151

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COCM^ rCO

Note: Within nine months from the publication of the mention of the grant of the European patent, any person maygive notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shallbe filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has beenpaid. (Art. 99(1 ) European patent convention).

Courier Press, Leamington Spa, England.LU



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20 and the liner 34 to define two air flow passages42 and 44.

A plurality of outer register vanes 46 are pivot-ally mounted between the plates 30 and 32 tocontrol the swirl of secondary air from the windbox to the air flow passages 42 and 44. In a similar

manner a pluralityof inner

register vanes48

arepivotally mounted between the plates 30 and 38to further regulate the swirl of the secondary airpassing through the annular passage 44. It isunderstood that although only two register vanes46 and 48 are shown in Fig. 1, several more vanesextend in a circumferentially spaced relation tothe vanes shown. Also, the pivotal mounting ofthe register vanes 46 and 48 may be done in anyconventional manner, such as by mounting thevanes on shafts (shown schematically in Fig. 1)and joumaling the shafts in proper bearingsformed in the plates 30, 32 and 38. Also, theposition of the vanes 46 and 48 may be adjustableby means of cranks or the like. Since these types

of components are conventional they are notshown in the drawings nor will be described inany further detail.

A plurality of sorbent injectors 49 are provided,each of which extends through the plates 30 and38, between two vanes 48 and into the air flowpassage 42. The inlet end portion (not shown) ofeach injector 49 is connected to a source orsorbent such as limestone, Ca(OH)2, or the likeand the discharge end is located at the opening 12of the front wall 14. Although not clear from thedrawing, it is understood that more than twoinjectors 49 can be provided in a equilangularlyspaced relation around the nozzle 20, and that thevelocity of injection and injection angle can be

controlled at each injector in a conventionalmanner.

The quantity of air flow from the wind box intothe register vanes 46 is controlled by movementof a sleeve 50 which is slidably disposed on theouter periphery of the plate 32 and is movableparallel to the longitudinal axis of the burnernozzle 20. An elongated worm gear 52 is providedfor moving the sleeve 50 and is better shown inFigure 2. The worm gear 52 has one end portionsuitably connected to an appropriate drive means(not shown) for rotating the worm gear and theother end provided with threads 52a. The wormgear 52 extends through a bushing 54 (Fig. 1)which is attached to the plate 30 to providerotatable support. The threads 52a of the wormgear 52 mesh with appropriate apertures 55formed in the sleeve 50 so that, upon rotation ofthe worm gear, the sleeve moves longitudinallywith respect to the longitudinal axis of the burner20 and across the air inlet defined by the plates 30and 32. In this manner, the quantity of combus-tion supporting air from the wind box passingthrough the air flow passages 42 and 44 can becontrolled by axial displacement of the sleeve 50.A perforated air hood 56 extends between theplates 30 and 32 immediately downstream of thesleeve 50 to permit independent measurement ofthe air flow to the burner 20.

conjunction with the accompanying drawings,wherein:

Fig. 1 is a sectional view depicting the burnerassembly of the present invention;

Fig. 2 is a partial perspective view of a com- sponent of the burner assembly of Fig. 1;

Fig. 3 is an enlarged elevational view, partiallycut-away, of the burner portion of the assembly ofthe present invention;

Fig. 4 is an end view of the burner portion of ioFig. 3; and

Fig. 5 is a cross-sectional view taken along theline 5—5 of Fig. 3.

Referring specifically to Figure 1 of the draw-ings the reference numeral 10 refers in general to jsa burner assembly which is disposed in axialalignment with a through opening 12 formed in afront wall 14 of a conventional furnace. It isunderstood that the furnace includes a back walland side walls of an appropriate configuration to 20define a combustion chamber 16 immediately

adjacent the opening 12. Also similar openingsare provided in the furnace front wall 14 foraccommodating additional burner assembliesidentical to the burner assembly 10. The inner 25surface of the wall Mas well as the other walls ofthe furnace are lined within an appropriatethermal insulation material 18 and, while notspecifically shown, it is understood that the com-bustion chamber 16 can also be lined with boiler 30tubes through which a heat exchange fluid, suchas water, is circulated in a conventional mannerfor the purposes of producing steam.

It is also understood that a vertical wall isdisposed in a spaced parallel relationship with the 35furnace wall 14 in a direction opposite that of the

furnace opening 12 along with correspondinglyspaced top, bottom and side walls to form aplenum chamber, or wind box, for receivingcombustion supporting air, commonly referred to 40as "secondary air", in a conventional manner.

The burner assembly 10 includes a nozzle 20having an inner tubular member 22 and an outertubular member 24. The outer tubular member 24extends over the inner tubular member 22 in a 45coaxial, spaced relationship thereto to define anannular passage 26 which extends towards thefurnace opening 12.

A tangentially disposed inlet 28 communicateswith the outer tubular member 24 for introducing soa stream of fuel into the annular passage 26 aswill be explained in further detail later.

A pair of spaced annular plates 30 and 32extend around the burner 20, with the inner edgeof the plate 30 terminating on the outer tubular 55member 24. A liner member 34 extends from theinner edge of the plate 32 and in a generallongitudinal direction relative to the burner 20and terminates adjacent the insulation material 18just inside the wall 14. An additional annular plate so38 extends around the burner 20 in a spaced,parallel relation with the plate 30. An air dividersleeve 40 extends from the inner surface of theplate 38 and between the liner 34 and the nozzle20 in a substantially parallel relation to the burner 65



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the relative flow of the two streams while varyingtheir velocity.

It is understood that appropriate ignitors can beprovided adjacent the outlet of the nozzle 20 for

5 igniting the coal as it discharges from the nozzle.Since these ignitors are of a conventional designthey have not been shown in the drawings in theinterest of clarity.

In operation of the burner assembly of the10 present invention, the movable sleeve 50 asso-

ciated with each burner is adjusted during initialstart up to accurately balance the air to eachburner. After the initial balancing, no furthermovement of the sleeves 50 are needed since

m normal control of the secondary air flow to theburners is accomplished by operation of the outerburner vanes 46. However, if desired, flow controlcan be accomplished by the sleeve.

Fuel, preferably in the form of pulverized coal20 suspended or entrained within a source of prim-

ary air,is introduced into the tangential inlet 28

where it swirls through the annular chamber 26.Since the pulverized coal introduced into the inlet28 is heavier than the air, the pulverized coal will

25 tend to move radially outwardly towards the innerwall of the outer tubular member 24 under thecentrifugal forces thus produced. As a result, agreat majority of the coal along with a relativelysmall portion of air enters the outer annular

30 passage defined between the outer tubularmember 24 and the divider cone 58 (Fig. 5) whereit encounters the apexes of the splitters 60. Thestream is thus split into four equally spacedstreams which discharge from the nozzle outlet

35 and, upon ignition, form four separate flame

patterns. Secondary air from the inner air passage44 (Fig. 1) passes through the inlets 62 formed inthe outer tubular member 24 and enters theannular passage between the latter member and

40 the divider cone 58 to supply secondary air to thestreams of coal and air discharging from theoutlet.

The remaining portion of the air-coal mixturepassing through the annular passage 26 enters

45 the annular passage defined between the dividercone 58 and the inner tubular member 22. Themixture entering this annular passage is mostlyair due to the movement of the coal radiallyoutwardly, as described above. The position of

so the movable tip 64 can be adjusted to precisely

control the relative amount, and therefore vel-ocity, of the air and coal discharging from thenozzle 20 from the annular passages between theouter tubular member 24 and the divider cone 58

55 and between the divider cone and the innertubular member 22.

Secondary air from the wind box is admittedthrough the perforated hood 56 and into the inletbetween the plates 30 and 32. The axial and radial

60 velocities of the air are controlled by the registervanes 46 and 48 as it passes through the air flowpassages 42 and 44 and into the furnace opening12 for mixing with the coal from the nozzle 20. Theigniters are then shut off after steady state com-

65 bustion has been achieved.

As shown in Figs. 3— 5, which depict the detailsof the nozzle 20, the end portion of the outertubular member 24 and the corresponding endportion of the inner tubular member 22 aretapered slightly radially inwardly toward the fur-

nace opening12. A divider cone 58 extends

between the inner tubular member 22 and theouter tubular member 24. The divider cone 58 hasa straight portion 58a (Fig. 5) which extendsbetween the straight portions of inner tubularmember 22 and the outer tubular member 24, anda tapered portion 58b which extends between thetapered portions of the tubular members for theentire lengths thereof. The function of the dividercone 58 will be described in greater detail later.

A plurality of V-shaped splitters 60 are circum-ferentially spaced in the annular space betweenthe outer tubular member 24 and the divider cone58 in the outlet end portion of the nozzle 20. Asshown in Figs. 3 and 4, four such splitters 60 are

spaced at 90° intervals and extend from the outletto a point approximately midway between thetapered portions of the tubular members 22 and24. Each splitter 60 is formed by two plate mem-bers welded together at their ends to form a V-shape. The plate members are also welded alongtheir respective longitudinal edges to the outertubular member 24 and the divider cone 58 tosupport the splitters and the divider cone in thenozzle 20. The apex of each splitter 60 is disposedupstream of the nozzle outlet so that the fuel-airstream flowing in the annular space between thedivider cone 58 and the outer tubular member 24will be directed into the adjacent spaces definedbetween the splitters to facilitate the splitting of

the fuel stream into four separate streams.Four pie-shaped openings 62 are formedthrough the outer tubular member 24 and respec-tively extend immediately over the splitters 60.These openings are for the purpose of admittingsecondary air from the inner air flow passage 44(Fig. 1) into the annular space defined betweenthe divider cone 58 and the outertubular member24 for reasons that will be explained in detail later.

As shown in Fig. 5, a tip 64 is formed on the endof the tapered portion of the inner tubularmember 22 and is movable relative to the lattermember by means of a plurality of rods 66extending within the tubular member and affixedto the inner wall of the tip. The other ends of the

rods 66 can be connected to any type of actuatordevice (not shown) such as a hydraulic cylinder ofthe like to effect longitudinal movement of therods and therefore the tip 64 in a conventionalmanner.

It can be appreciated from a view of Fig. 5 thatthe longitudinal movement of the tip 64 varies theeffective outlet opening defined between the tipand the divider cone 58 so that the amount of fuel-airflowing through this opening can be regulated.Since the divider cone 58 divides the fuel-airmixture flowing through the annular passage 26into two radially spaced parallel streams extend-ing to either side of the divider cone 58, it can beappreciated that movement of the tip 64 regulates



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passing the peak flame temperature zone as isfeasible. This increases the efficiency of the sulfurcapture and results in capture that is equal to orbetterthan capture methods external to the burnerthroat.

It is understood that several variations andadditions

maybe made to the foregoing

apparatus. For example, since the arrangementpermits the admission of air at less thanstoichiometric for further reductions in NOX emis-sions, overfire air ports, orthe like can be providedas needed to supply air to complete the combus-tion. Also, the distribution of the sorbent injectors49 around the periphery of the burner can bevaried to obtain optimum sulfur capture.Additionally, the burner levels which receive sor-bent injectors are dependent on the number ofburner levels, slagging characteristics of the coalash and the gas temperature at the exit to thefurnace's radiant zone. Boilers with three or moreburner levels need only have the top two levels

contain sorbent injectors. Thisis sufficient to

provide an effective calcination zone for calcium-based sorbents along with a long residence timefor sulfation reactions to occur prior to the furnaceexit.

Claims

Sorbent is injected, by the injectors 49, into thesecondary air stream flowing through the flowpassage 42 at the opening 12 to capture the sulfurdioxide produced as a result of combustion of thecoal.

As a result of the foregoing, several advantages

result from the burner assembly of the presentinvention. For example, since the pressure dropacross the perforated air hoods 56 associated withthe burner assemblies can be equalized by balanc-ing the secondary air flow to each burner byinitially adjusting the sleeves 50, a substantiallyuniform flue gas distribution can be obtainedacross the furnace. This also permits a commonwind box to be used and enables the unit tooperate at lower excess air with significant reduc-tions in both nitrogen oxides and carbon monox-ides. Also, the provision of separate register vanes46 and 48 for the outer and inner flow passages 42and 44 enables secondary air distribution andflame shape to be independently controlled result-

ing in a significant reduction of nitrogen oxides,and a more gradual mixing of the primary air coalstream with the secondary air since both streamsenter thefumace on parallel paths with controllingmixing.

Further, the provision of multiple flame patternsresults in a greater flame radiation, a loweraverage flame temperature and a shorter resi-dence time of the gas components within theflame at a maximum temperature, all of which, asstated above, contribute to reduce the formation ofnitric oxides.

Still further, the provision of the tangential inlet28 provides excellent distribution of the fuelaround the annular space 26 in the nozzle 20,

resulting in more complete combustion and reduc-tion of carbon loss and making it possible to useindividual burners with capacities significantlyhigher than otherwise could be used. Provision ofthe inlet openings 62 in the outer tubular memberpermits the introduction of a portion of thesecondary air to be entrained with the fuel-airstream passing through the annular passagebetween the outer tubular member 24 and thedivider cone, since the majority of this stream willbe primarily pulverized coal. As a result, a sub-stantially uniform air-coal ratio across the entirecross-section of the air-coal stream is achieved.Also, the provision of the movable tip 64 toregulate the flow of the coal-air mixture passingthrough the inner annular passage definedbetween the divider cone 58 and the inner tubularmember 22 enable the airflow on both sides of thedivider cone to be regulated thereby optimizingthe primary air velocity with respect to thesecondary air velocity.

Also, by injecting the sorbent into the outersecondary air annulus the particles will by-passthe hottest part of the flame so that a minimum ofdeadburning of the sorbent will occur. Also, sincethe sorbent particles will be rapidly entrained inthe swirling secondary air from this outersecondary annulus they will be intimately mixedwith the products of combustion as soon after

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30 1. A burner assembly for particulate fuel com-prising an annular fuel passage defined by aninner tubular member (22) and an outer tubularmember (24) extending around said inner tubularmember in a coaxial relation thereto, an inlet

35 located at one end of said passage for receivingfuel and adapted to direct such fuel tangential ly

thereinto, and a nozzle (20) located at the other endof said passage for discharging said fuel, anenclosure extending over said fuel passage for

40 receiving air, and means (34, 40) for directing saidairfrom said enclosure towards said nozzle in tworadially spaced, parallel paths (42, 44), extendingaround said passage, characterised in that

a sleeve (58a, 58b) is disposed within said45 passage for dividing the stream into two radially

spaced parallel annular streams such that a sub-stantial portion of said particulate fuel flows intothe said outer annular stream as a consequence ofcentrifugal forces, the assembly including means

50 (64, 66) for regulating the flow rate in at least one ofsaid parallel annular streams, at least one air inlet

opening (62) formed in a portion of said outertubular member (24) for admitting air to said outerannular stream as it discharges from said nozzle,

55 and means (49) for injecting sorbent into theradially outer path at said nozzle for capturing thesulfur produced as a result of combustion of saidfuel.

2. A burner assembly according to Claim 160 characterised in that said sorbent is pre-pulverised

and is transported with air, steam, or as a slurry.3. A burner assembly according to Claim 1 or

Claim 2 characterised in that the inlet to theannular passage (26) is a pipe (28) disposed

65 tangentially relative thereto.

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4. A burner assembly according to any preced-ing Claim further characterised by means (50, 52,52a, 54, 56), for regulating the quantity of airentering said enclosure.

5. A burner assembly according to Claim 4 scharacterised in that said regulating means

com-prises a sleeve (50) movable across the inlet tosaid enclosure to vary the size of said inlet.

6. A burner assembly according to Claim 5further characterised by a perforated hood (56) mextending across the inlet of said enclosure andco-operating with said movable sleeve to controlthe quantity of air entering said enclosure.

7. A burner assembly according to Claim 4,Claim 5 or Claim 6 further characterised by means 15(46, 48), disposed in said air paths for regulatingthe quantity of air flowing therethrough.

8. A burner assembly according to any preced-ing Claim further characterised by means (60) forsplitting-up one of said air streams as it dis- 20

charges from said nozzle (20) so that upon igni-tion of said particulate fuel, a plurality of flamepatterns are formed.

9. A burner assembly according to Claim 8characterised in that said splitting means (60) 25extends between said outer tubular member (24)and said sleeve (58a, 58b) and splits up said outerstream.

10. A burner assembly according to Claim 9characterised in that said splitting means (60) 30comprises a plurality of V-shaped membersextending in a circumferentially spaced relation-ship in the annular space between said outertubular member (24) and said sleeve (58a, 58b)and disposed in said passage so that the apex of 35

each member faces upstream and said outerstream flows against said members which directsaid stream into the spaces between said mem-bers.

11. A burner according to any preceding Claim 40characterised in that said flow rate regulatingmeans comprises a movable tip (64) disposed atthe nozzle on the end of said inner tubularmember (22) and movable thereto.

45Patentanspriiche

1. Brennerbaueinheit fur Partikelbrennstoff, auf-weisend eine ringformige Brennstoffpassage, diedurch ein inneres rohrfdrmiges Element (22) und 50ein sich um das innere rohrformige Element inkoaxialer Beziehung zu diesem erstrekkendesauSeres rohrfdrmiges Element (24) definiert ist,einen an einem Ende dieser Passage gelegenenEinlaS, der zur Brennstoffaufnahme dient und so 55ausgelegt ist, daB er solchen Brennstoff tangen-tial dorthinein leitet, und eine Diise (20), die amanderen Ende der Passage liegt, zum AusstoSendes Brennstoffs, eine sich iiber die Brennstoffpas-sage erstreckende Einfassung zur Aufnahme von soLuft und eine Einrichtung (34, 40), die die Luft vonder Einfassung zur Duse hin in zwei radial beab-standeten parallelen Bahnen (42, 44) leitet, die umdie Passage herum verlaufen, dadurch gekenn-zeichnet, daS innerhalb der Passage ein Fuh- 65

rungskorper (58a, 58b) angeordnet ist, um denStrom in zwei radial beabstandete parallele ring-formige Strome derart aufzuteilen, daS einwesentlicher Teil des Partikelbrennstoffs infolgevon Zentrifugalkraften in diesen auSeren ringfor-

migenStrom

strdmt,daS die Baueinheit Einrich-

tungen (64, 66) zum Regulieren der Stromungs-rate zumindest in einem der beiden parallelenringformigen Strome aufweist, ferner zumindesteine LufteinlaSoffnung (62), die in einem Teil desauSeren rohrformigen Elements (24) ausgebildetist, zum Einlassen von Luft in den auSeren ring-formigen Strom, so wie sie aus der Duse austritt,und eine Vorrichtung (49) zum Einspritzen vonSorbens in die radial auSere Bahn an der Diisezum Auffangen des infolge der Brennstoffver-brennung erzeugten Schwefels.

2. Brennerbaueinheit nach Anspruch 1, dadurchgekennzeichnet, daS das Sorbens vorpulverisiertist und mit Luft, Dampf oder als eine Breiauf-

schlammung transportiert wird.3. Brennerbaueinheit nach Anspruch 1 oder 2,dadurch gekennzeichnet, daS der EinlaS zur ring-formigen Passage (26) eine Rohre (28) ist, dietangential hierzu angeordnet ist.

4. Brennerbaueinheit nach einem der vorherge-henden AnsprCiche, ferner gekennzeichnet durchEinrichtungen (50, 52, 52a, 54, 56) zum Regulierender Luftmenge, die in diese Einfassung eintritt.

5. Brennerbaueinheit nach Anspruch 4, dadurchgekennzeichnet, daS die regulierenden Einrich-tungen eine iiber den EinlaS zu dieser Einfassungzum Variieren der GroSe des Einlasses beweg-bare Hulse (50) umfassen.

6. Brennerbaueinheit nach Anspruch 5, ferner

gekennzeichnet durch eine perforierte Haube (56),die sich durch den EinlaS dieser Einfassungerstreckt und mit dieser bewegbaren Hulse zurSteuerung der in diese Einfassung eintretendenLuftmenge zusammenwirkt.

7. Brennerbaueinheit nach Anspruch 4,Anspruch 5 oder Anspruch 6, ferner gekennzeich-net durch eine Einrichtung (46, 48), die in diesenLuftbahnen zum Regulieren der hierdurch flieSen-den Luftmenge angeordnet ist.

8. Brennerbaueinheit nach einem der vorherge-henden Anspriiche, ferner gekennzeichnet durcheine Einrichtung (60) zum Aufspalten eines dieserLuftstrome, so wie dieser aus der Duse (20)austritt, so daS bei Ziindung des Partikelbrenn-stoffs mehrere Flammenformen gebildet werden.

9. Brennebaueinheit nach Anspruch 8, dadurchgekennzeichnet, daS die Aufspaltungseinrichtung(60) zwischen dem auSeren rohrformigen Ele-ment (24) und dem Fuhrungskorper (58a, 58b)verlauft und den aulSeren Strom aufspaltet.

10. Brennerbaueinheit nach Anspruch 9,dadurch gekennzeichnet, daS die Aufspaltungs-einrichtung (60) mehrere V-formige Glieder auf-weist, die sich umfangsmaSig in zueinanderbeabstandeter Weise im ringformigen Raumzwischen dem auSeren rohrformigen Element(24) und dem Fuhrungskorper (58a, 58b) erstrek-ken und in dieser Passage so angeordnet sind,daS der Scheitelpunkt jedes Gliedes in die Stro-



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cation 1 ou 2, caracterise en ce que I'entree depenetration dans le passage annulaire (26) estune canalisation (28) disposee tangentiellementpar rapport a ce passage.

4. Ensemble formant bruleur selon I'une quel-conque des revendications precedentes, caracte-

rise en outre par des moyens (50, 52, 52a, 54, 56)servant a regler la quantite d'air penetrant dansladite enceinte.

5. Ensemble formant bruleur selon la revendi-cation 4, caracterise en ce que lesdits moyens deregulation comprenent un manchon (50) deplaga-ble en travers de I'entree de ladite enceinte demaniere a modifier la taille de cette entree.

6. Ensemble formant bruleur selon la revendi-cation 5, caracterise en outre par un capot perfore(56) s'etendant en travers de I'entree dans laditeenceinte et cooperant avec ledit manchon mobilede maniere a regler la quantite d'air penetrantdans ladite enceinte.

7. Ensemble formant bruleur selon la revendi-cation 4, 5 ou 6, caracterise en outre par desmoyens (46, 48) disposees dans lesdits trajets decirculation de I'air pour regler la quantite d'aircirculant dans ces trajets.

8. Ensemble formant bruleur selon I'une quel-conque des revendications precedentes, caracte-rise en outre par des moyens (60) pour subdiviserI'un desdits ecoulements d'air lorsqu'il sort deladite bus (20) de sorte que, lors de I'alumagedudit combustible particulaire, une pluralite deprofils de flammes sont formes.

9. Ensemble formant bruleur selon la revendi-cation 8, caracterise en ce que lesdits moyensdiviseurs (60) s'etendent entre ledit element tubu-laire exterieur (24) et ledit manchon (58a, 58b) etsubdivisent ledit ecoulement exterieur.

10. Ensemble formant bruleur selon la revendi-cation 9, caracterise en ce que lesdits moyensdiviseurs (60) comprennent une pluralite d'ele-ments en forme de V s'etendant en etant espacescirconferentiellement dans I'espace annulairecompris entre ledit element tubulaire exterieur(24) et ledit manchon (58a, 58b) et disposes dansledit passage de sorte que le sommet de chacundes elements est tourne vers le haut et que leditecoulement exterieur circule contre lesdits ele-ments qui dirigent ledit ecoulement dans lesespaces situes entre ces elements.

11. Bruleur selon I'une quelconque des revendi-cations

precedentes,caracterise en ce

quelesdits

moyens de regulation du debit comprennent unepointe mobile (64) disposee dans la buse, surI'extremite dudit element tubulaire interieur (22)et deplagable par rapport a ce dernier.

maufwartsrichtung zeigt und der aulSere Stromgegen diese Glieder stromt, die den Strom in dieRaume zwischen den Gliedern leiten.

11. Brennerbaueinheit nach einem der vorher-gehenden Anspruche, dadurch gekennzeichnet, 5daB die Einrichtung zum Regulieren der Stro-

mungsrate eine bewegbare Mundspitze (64) auf-weist, die an der Duse am Ende des inerenrohrformigen Elementes (22) angeordnet ist undhierzu bewegbar ist. 10

Revendications

1. Ensemble formant bruleur pour un combusti-ble particulaire, comprenant un passage annu- mlaire d'amenee du combustible, defini par unelement tubulaire interieur (22) et un elementtubulaire exterieur (24) s'etendant autour duditelement tubulaire interieur en etant coaxial parrapport a ce dernier, une entree situee a une 20extremite dudit passage pour recevoir le combus-tible et apte a introduire tangentiellement un telcombustible dans le passage, et une buse (20)situee a I'autre extremite dudit passage et servanta refouler ledit combustible, une enceinte s'eten- 25dant au-dessus dudit passage prevu pour le com-bustible et servant a recevoir de I'air, et desmoyens (34, 40) pour diriger ledit air depuiseladite enceinte en direction de ladite buse selondeux trajets paralleles (42, 44) espaces radiale- 30ment et s'etendant autour dudit passage,

caracterise en ce qu'un manchon (58a, 58b) estdispose a I'interieur dudit passage de maniere asubdiviser I'ecoulement un deux ecoulementsannulaires paralleles et espaces radialement de 35sorte qu'une partie substantielle dudit combusti-ble particulaire penetre dans ledit ecoulementannulaire exterieur sous I'effet de la force centri-fuge, I'ensemble incluant des moyens (64, 66)servant a regler le debit dans au moins I'un 40desdits ecoulements annulaires paralleles, aumoins une ouverture (62) d'admission d'air mena-gee dans une partie dudit element tubulaire exte-rieur (24) pour admettre I'air dans ledit ecoule-ment annulaire exterieur lorsqu'il sort de ladite 45buse, et des moyens (49) servant a injecter unagent de sorption dans le trajet exterieur du pointde vue radial, au niveau de ladite buse, pourcapturer le soufre produit sous I'effet de la com-bustion dudit combustible. 50

2. Ensemble formant bruleur selon la revendi-cation 1, caracterise en ce que ledit agent desorption est prealablement pulverise et estentratne par de I'air, de la vapeur ou bien sous laforme d'une boue. 55

3. Ensemble formant bruleur selon la revendi-

60

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Joel Vatksy-Foster Wheeler-1988-Controlled Flow, Split Stream Burner Assembly With Sorbent Injection

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