DE1508095A1 - Method and device for cooling combustion chambers by means of powdery material - Google Patents

Description

Patent attorneys Dr. RUDOLF BAUER Dipl. Ing, HELMUl HU3BUCH

PFORZHEIM

Westiidi «31. UopoWplah .. TeWon 24290 Enn VaHak, Geneve, Switzerland.

Process and device for cooling combustion chambers witteis powder organic material.

(Addition to “Patent Patent Application Kr. V -28 364;

VIa / 18a)

The main patent describes a process for cooling of a combustion chamber at the Senselzreduktlon of Metal oxides described in which the metal oxide is 1 fora of one or more curtains or the like as a coolant between a bin feed and a Rochteeperaturzone de · combustion room · is supplied. The present invention not only relates to a further development of this cooling method for use to · cooling by curtain effect but also for direct cooling Cooling of the combustion zone also in other · contexts than for tendon reduction in that powdery material or almost powdery Material with different grain sizes of the Hocbteaperaturzonc of the combustion chamber «is supplied in such a way that the larger particles of the powder material« essentially outside the finer particles in relation to the middle part of the high temperature zone # are located. This ensures that the finer particles, which are the most effective for cooling,

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are closest to the area in which the temperature is highest and thus the greatest there Part of the warmth absorbs the larger particles oebr act as a subsequent shield in front of the furnace walls.

The particles, the curtains between the combustion zone and the «oven fodder form, receive a fairly high speed, thereby a certain Direction of movement, e.g. from the middle part of the high temperature zone or the furnace to the outside to the oven walls that are to be cooled. Those with the greatest mass, i.e. the largest particles, also get the greatest speed. The smaller a particle is the more difficult it is to move it in a certain path. In this way it is achieved that the above-mentioned distribution of coarse and fine particles can be maintained.

The invention can be used in other types of processes that use a high temperature zone wants to shield from the oven lining in order to reduce the heat radiation after the lining and the powdery Heat material, preferably a seal material used in the process. In the following, the Invention, however, in connection with their application for smelting reduction for the production of pig iron from powdered material in the form of metal oxide or Scrap case to be described. This is what follows

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Metal oxide, scrap drop or other, the curtains forming «material called Schlick.

Gealss a change in the founding can the powdery material through a liquid, x.B. Schaolzenes llaen, replaces «earth, the la Zusaaaenbang “It is the manufacture of steel using oxygen So watch a "Bobeisenbad in a" or Aebreren gate hangings are led to us the walls of the furnace room opposite the exposed zone of the furnace cool. I.

In the drawings there are some formulas of torr experiences to carry out the discovery shown.

Fig.l shows a vertical section of a sketch a melting furnace to which the invention is applied;

Fig.2 is a vertical section showing an embodiment the stove shows la linen;

3 shows an embodiment old cooling box _t zusaaaen the old ualaufenden wheels for the ejection of the powder material * rotate;

Fig. 4 shows a further embodiment * for ·, at whoever the silt is carried out through a central bobr;

5 shows an embodiment for one

* - sludge spinner;

Fig. Β is a tertiary object through "in-" JJ Werter for the manufacture of steel from Eoaelsr «; Flg. ? shows a modification of this converter.

* * - ORIGINAL BATHROOM

According to Fig. 1, the silt is through a central Feed line 3 into an oven «with an oven wall 1 and a "a" lower part of the weld pool 2 eyes leads. In the middle section 4, the silt receives a rapid borieontial movement outwards and downwards all sides, and at 5 the stroke becomes the horizontal one Direction deflected in the vertical direction. If the silt consists of particles of different sizes, which is always the case in practice, the largest particles follow the course of the outer course, while the finer particles 7 set themselves inside the coarser ones and the finest particles 8 at all can move in a predetermined path. The result is that the viewing litter is in the oven a shape is given which, according to its outer contour, is determined by the coarser particles 6, while the finer particles 7 and β are within this grease which consists of the curtain formed by the coarser particles.

The Boch temperature zone 9 is located in the middle part of the furnace room large heat dissipation from this zone towards the furnace walls 1 BU prevent. This is made possible by the impact of the in the greater, strict sense, the silt particles that form the curtain β reached; However, the Bocfateaperatursone becomes even higher due to the finer particles 7 and 8 cooled and shielded. The cooling effect is nialioh

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proportional to the area exposed to the thermal radiation, and the finer particles represent the largest part of the silt surface formed by the silt particles. A silt normally used for this purpose can have a total area of, for example, 550 cm ² / dr . The coarser particles correspond, for example, to 50 % of the total weight and have a specific flee of, for example

100 cm ² / gr, while the finer (50 Qewicbtprosent)

have a specific area of 1000 ca / gr. from

of the seeded area, in this case 55,000 approx. ³ with 100 grams of silt, the finer particles thus contribute with 50,000 approx. ² , ie ait approx. 90%. In the production of I! Ropes, if you have a good view you need about 1500 kg of silt per ton of pig iron, so that the total exposed silt area in the case of the above

2
Grain size is about 83000 a per ton of loheisen. It is easy to see that this grease flea has a large heat-absorbing capacity.

The shielding effect after the furnace wall is not only due to the grain size of the sludge but also to the amount of silt per unit of time, the thickness of the blockage as well as affects the speed of the silt layer. Lin is another factor and a regulatory requirement Distance 13 between the Schlickvorbang and the furnace wall. This distance can be made very large if desired, since the silt flow is a contact surface

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after the distraction & cbirn as a means of demarcation The furnace chamber is at.

The finer particles have so · It a groseea heat absorption capacity due to its large area and can therefore quickly overheat the oven while they themselves are heated «ground. By regulating the percentage of fine particles the high temperature zone can be at a suitable temperature level being held. The finer silt particles obtained move just as much as the coarser ones Particles down to bath 2 and react there with this bath under Beduktioo.

One can of course think in general, to add fine-grained particles to a furnace chamber in order to thereby generate radiant heat from a high-temperature rose absorb. A certain part of the silt can be seen in this way immediately after the high temperature zone be injected. Without further measures and devices as these, however, cannot prevent the finest particles in each case exit with the exhaust gases from the furnace and thus an application of this EOh! process is not possible not possible. The invention has achieved this object in the manner described above, dam the finer Particles are brought within a curtain of coarser particles.

As mentioned above, finer PartlawI «ims

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greater inclination than coarser, carried away by gas streams to become. The invention also fulfills this task. The exhaust gases leaving the furnace at 10 through opening 11 must pass through the mud curtain 12 into the area in the vicinity of the central part of the furnace, in which the silt particles have their greatest velocity. This prevents even fine particles from being carried upwards by the gas flow. the coarser particles have a certain injector effect ^ and cause the finer grains to sieve into their "wake" place. Effective filtering is achieved in this way.

The method described above, finer, heat-absorbing particles within a gate slope of coarser Moving particles at a greater speed can be carried out by means of a device which basically works in such a way that the coarser grains be forced to follow a certain path to a well-delimited curtain with a space 13 ι

from the oven lining while the finer grains are within that curtain.

«One embodiment of such a device will shown in Fig. 2, in which only the path of the coarser silt grains is shown. The silt is e.g. a vibrating chute 14 introduced into a pocket 15, of which he has a cavity 16 between a circumferential central hollow shaft 17 and a cooling jacket 18 is fed. The silt meets in the lower end of the cavity 16

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on "IM fast circulating and mainly" aage "stretches" or slightly inclined disc 19, which is firmly connected to the fur 17. As a result of the centrifugal force, the silt is thrown along the surface of the disk 19 and hits the lower surface of a wide revolving disk 20 which is firmly connected to the disk 19. The silt: 8tr (dead on it along the lower surface of the Sobelbe 20 up to the edge 21 and leaves the disc in a horizontal direction. The disc 20 'oil has a certain angle to the Borleontal plane, and a great speed due to animation. Sonlickstree 22 meets a deflection ah ir «23, which is placed at a certain distance from the centrifugal device 19, 20 formed by it. This distance is such that the exhaust gas velocity through this opening does not become too great.

The SchllckatroBj moves with otherwise free Ströening la essential horiaontal, taking note of the following is that the coarser particles are alch aua on the top of the Schlickstross. This achieves that the coarser particles are eager to screen close to the underside of the disc 20 as a result of their greater kinetic energy.

The Schlickstro «follows after the boriao · - talen flow of the inner surface of Sohirss 23, represents that

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The purpose of this is to transform the horizontal stroke into an approximately vertical, downwardly directed stream. The horizontal and vertical block flow form the sow described above, which is closed from the mud curtain. The deflection obir · 23 requested a curve shape suitable for its purpose. For a deflection u 90 °, its profile bB consists of a quadrant an arc of a circle and straight lines with a distance of 90 °. The angle of deflection - sat on the inside, however, can be larger and can be up to 1M °. Angles greater than 90 ° can be used in larger stoves, where the worn Scaliokvorbang begreaate building) should be large. The vertical or almost aenkreeata * Schblckstro · 24 forms the best for the Kflblvirkung silt curtain.

The us) running shaft 17 is from a motor shaft 25 via a speed-regulating transmission gear 26 old driven by a drive pulley 27. The shaft is supported by bearings 2t and 19. Since the circumferential door direction is called in dan Exhaust gases should be arranged auas as being cooled. The cooling can be vorgenoaaen in the manner inclined in Fig. 2 will. The exhaust gases ending up through the Schlickvorbang 21 are 1 · Rau · 30 geaaaawlt, from des) al « can be fed to an exhaust pipe. The tau · 30 becomes vo · horizontal Schlickvorbang 22, as well as aaek from «laer

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ORIGINAL

arbor «limited by water-cooled walls. The la exhaust 30 located part of the drive shaft 17 is also a water-cooled sheet metal hood having two jackets 31, the lower part 32 of which is the upper u - running disk 20 protects, while the middle part the shaft 17 schiltst. The cooling water is through pipes 33a is supplied to the central upper part 33 and drained off at 33b. The ceiling and the rarities of the Abgaarauaes 30 are also cooled by cooling boxes 34 and 35 old double winches. The lower cooling part is sit de 23 built. Between the KUbIkMsten for the central parts and for the upper part a seal 30.

The lower circumferential disk 19 is cooled by a double-shell construction 37, which is connected to the upper boring 38 and SB ”with a cooling system for the deflecting screen 23. The inlet pipe 38 is weaker than the outer pipe 39. The inner walls 40 arranged in a certain way (see also the cross section AA below in FIG. The underside of the cooling box is, for example, made of ceramic material 41 from the radiation and is also insulated from the oven 9.

The invention also includes a simple laying device to distribute the earlier and finer silt particles in the way you want. This happens to them suspension of the speed of the shaft 17 and daait the

ßAD ORIGINAL

Disks 19 and 20. Low speed bel fills a large number of fine particles emerge within the curtain formed by the coarser particles, while at high window speed a thicker one Part of the finer particles of the silt flow follows. This leads to larger bxw. lower exposure to high tea consumption get old.

Powdery material and special liaenersschlick have a strong abrasive effect on the Ablenkachira. To counteract wear and tear and, if necessary, prevent it, various Maasnabaen can be made. If the silt is aagnetic, Ψ · ^ Ο ^, or if it consists partially of aagnetic material, an abrasion through the silt itself can be prevented by attaching a magnet to the back of the ski. The Scbira does not necessarily have to be magnetic itself, but if this is the case, the magnetic lines of force saaaaaaa be better as a deflection sohlra. According to FIG. 2, magnets 42 are attached behind the Schira. The Schlickstroa strikes against the sheet metal at the position 43 where aagnetic Koracr have sat. The desired thickness of the protective layer can be regulated by suitable measurement of the strength of the magnet and the distance between the PiXa and the magnet.

2in "Another method that the Shira" u use is those who prove him old abrasion feature keraaiachea material bu. Another method is to use kontinalerllcli

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orter periodiecb in the same tent store a small Amount of material einaualechea, dna at «impingement» of den Sohir «on in · featgled or feataintert, and during A laid-back tent as a hindrance to wear and tear. Clothing serves.

Also those parts of the rotating disc the touch old silt bit greeaer Oeaohvlndlnlnlgkeit koBBin and therefore the weariness are auageaetat, B.B. the disks 19 and 20 know in a corresponding way gcaohutat «ground. Magnet «44 are both under the but arranged lower as the upper approaching disc. The others also acquired the Sobuta methodB can be applied to the rotating parts.

The device is attached to the approaching panes on a strong frame structure 45. Ala security device against Ixploaloaen la Ofenraua let the geeaate gate direction a.o. point 46 tiltable executes, ao daaa the Baua above dee Ofenrauaea calibration opens. The necessary for your tilting movement

Force is kept low by counterweights.

When in Fig. 2 dar gee te Uten device Iat daa Ktthlsjstea did the approaching "Achae eowie" the ualaufenden discs feat arranged.

VIg. S represents an execution form in which dl «cooling box auaaaaen old of the shaft 17 and the disks 19, SUN. Wave 17 does an aohelalea

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Küblwaeeer kanal 50, which at the top has a Küblweeeernnaobluea 61 over “in the rotatable coupling S1 la connection. The wells 17 are stored in bearings 53. The channel 50 let down "α" iatr BUiI-kaaaer 54 expanded, which cools the fohelbe 1 "and durob a view 1 eenkreobte channels β! "It eiaea coat SB in Terbiadong, which cools the well" 17 and atlndet at the top at 56, "a the Kttblwaeaer U eiaea the upper part of dea Ofeaa KUblrmua 57 muaatroaen su laeeen, from dna ffnaaer ditroli an overflow 58" enters. Dleaea BBblefatea did eintnob and eebr «irkana. . The Knaaer 54 forms an Ittblknaten that old the shaft 17 uallttft. line dlobten «let at 5» attached. The silt is aviaoaen das la dleeea ffcll alt each other Terbuadenen Icbelbea It ₁ IO by radlilo canals 60 overturned.

_t Hf..4 gives a further Auafttaraneaiion), with the dna cooling retea old of the shaft 17 «ad the Sonelbe 19.20 ualAuft, with which however the silt la eiaea trnlen Bohr 62 in the shaft 17 atntt la 2wiechenraua 1 · geaäee Pig. 2 and 3 eye leads. The Sch Uo k koaat from the vibration trough 14 and falls down into the funnel U, which is attached to the upper end of the top 62. Dna Ktthlajretea nhnllobt grundeätallob der Aaefübruagafora geanee Flg. 3, dna Ktthlwnaaer is however carried out by an ortefeat Jlnlaea 63, which is

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ren, the shaft 17 !! »giving cooling jacket 64 out ve liver below with an outer blue nantal βδ the other side a partition 66 in connection stands. This cooling jacket 65 is old an Aualaee 56 connected. The disk 19 is in the ··· case no own KUbIkteeer, but will go through untea keranisobic protective material 67 protected.

The devices shown in Figs. 2-4 have more than just a web-absorbent function Bchlickvorhang 24 su form but also as a filter to serve for the exhaust passing through the horizontal Curtain 22 to upstairs ströwwn and το · upper lau « SO live. Woraalerweiae this curtain is sufficient 21 to ensure that the fine body part of the exhaust gases do not get ripped out of the furnace. If a «special cleaning of the exhaust gases is desired a special horizontal curtain can be arranged will. This totnn possibly from other " Material as Sloenerzacblick exist, see B. au Saad, which has, for example, been pretreated by crushing and remove the finer grain fractions. The sand can unsuccessful in the Syaten.

Flg. 5 μigt, «ie dl« centrifugal device la the upper part 68 of an oven room «received ··· tat s« in kamn. The oasis stream through the Sobliokvorbang It at 10 am

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Αϊ

up through channel 11 for data extraction. Above in the channel 11 the special curtain 69 is attached. The sand or other similar core-shaped material is placed in a stationary position via a pocket 70 Tube 71 with double wall is supplied and by the circumferential disks 72 and 73 in the form of the curtain 69 after the walls 74 of the channel 11 thrown out. The disks 72 and 73 are fixed to one another and to the circumferential hollow waste 17 connected, on which the lower disks 19,20 are attached. The sand in the curtain 69 is against the curved wall 74 is thrown and the current is thereby bent in a vertical direction. The sand is again collected in a channel 75 and left the window over a surface 76. The sand can then be returned to the pocket 70 afterwards it may have previously flowed through a channel 77.

The powdery raw material for the process can also be used for the second filter curtain 69. Here, the silt la the same way is inserted as illustrated in Flg.5 and is recycled through the channel 77 la furnace lining worn out, whereupon the example preheated to about 500 ⁰ C mud back to the feed point 40, a plurality of curtains 69 can be applied.

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In the case of ovens with a large capacity, the oven can have an elongated fora along the horizontal section, e.g. ait semicircular end walls. Uaη can then have several Arrange the ski curtains horizontally next to each other. The outlet for exhaust gases is conveniently on the forehead · » ends of the elongated oven roughness.

Many modifications to the invention are conceivable. Oxygen or air can be supplied from a Saaelleltung 78 iFlg.l) through hole punch 79 in the walls of the combustion chamber , preferably at the lower part of this space above of the Schaelzbath 22, supplied «ground.

From the description it appears that aan die Can regulate the speed of the powder particles to regulate the cooling effect. The powdery material, preferably the finer particles, can be immediate ia blown in the high temperature zone for cooling.

Furthermore, the mentioned discs can be cleaned by another running centrifuge or blow-molding device, E.g. in the form of one or more running nozzles can be replaced.

When the main part of the powder * teriala unaagnetic a certain part of a magnetic powder material can be mixed in, among other things by means of a ms Magnetic field a Abnationsschicbt on the Ablenkscbiraen and possibly also on moving parts of the

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Discs and the drive device su form. Furthermore, aa Ablenkscbira or at the encircling Discs etc. Ground glued or sintered material as a covering for these parts. The speed of the rotating disks can be changed, including the division of the fine and regulate the coarse particles.

Difficulties old the finfutterang lie

also often in cases other than Scbaelaredok- j

tion before. The same principle as the above can s.B. in the manufacture of steel from praise iron a converter can be used with oxygen injection. Flg. 8 and 7 Selective example "for this" on " turn of misconception. In Flg. 8 lends 1 the converter and 2 a scbaels bath from Bohelaea, against that Oxygen blown through a Bohr 78 vlrd. Plus pig iron and / or silt or other powdery Material is introduced through an outer bore 17 and by means of a stationary or ua- '

running disc 79 thrown out, including a gate slope 80 su form, which is in a la substantial vertical, the Hocbteaperatursone uaschlosing gate slope is bent, «le in the drawing is inclined. Through this the converter is cooled. The liquid «Bobelsen can either directly against the wall of the kocverter be thrown or «mn can also dl« mentioned above

* ¹⁷ "9098U / 07I2

Apply scbirae, among other things form a curtain between the banverter wall and the combustion zone, see "line unaitteIbere distribution after the Eoaverter wall should In the" ice grooves as sweokaissigatea βein.01 "At the same time, this curtain acts as a filter for the exhaust gases. Admitting "it de * loheieea can" admit atseh the required dear crowd Sob lick.

The oxygen can be in a known manner through a probe from the side or through the center of the Disk 79 are blown in, as shown in Fig. 9 * is. The disc and its central veils can also sit on fire-proof Haterlal occupies min.

Because the Boheieen io this fei « is distributed, a large <§ fontatstflielM is obtained.

You can also act · « Wig . 7 the convertor X bit of a ίΓ, τ .... ti ring * , in which the praise- «λ>,. / -« on ***** upper bitter S3 with a «bottom outlet & 3 and a Abechl ^ «84 is poured. When the gutter has been filled to a certain extent, the pig iron runs over the edge and in sins the Bbehteaperatumone ue "ohliee" en "at the front and / or along the converter edge, which is thereby knotted down.

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Claims (21)

PATENT LAWYERS Dr. RUDOLF BAUER Dipl. Ing HELMUI HUaBUCH PFORZHEIM 31. UopoMpbtz · T.Woo 242 »1508095 patent claims. 1. Process according to patent (patent application ** "via / 18a ^4} ***" ^{1DihUn wam} ▼ • 'tweiÄttmeeriuMn «it te la powdery or approximately powdery material of different particle sizes, because in fore of a · or min Curtains swischea one or more winds in the combustion chamber * «ad | a high temperature aooe Ib dieaes is approached, thereby characterized because the coarser particles de Powder material «la essential awuierbalb of feia · - Ren particle la Vera never sur »older PartU der Roobteaperatnraone attached or grounded. 2. Terfabren according to PateBtaaepnicb 1, dad «re · marked, the other door length Xb different AbetlendeB from the oven wall purposely long the bra The effect of the door hangings can be suggested. S. The method according to claim 1 or t, characterized in that * · the Oesohwladiglceit the Powder particles snr le ge long the warping against the Furnace wall is changed. 4. Method according to one of the patent applications 1-3, characterized in that at least ice part of the powdery material, preferably of the finer type Part, immediately after the punching temperatsrsome eingsfBsrt or is blown in, in order to directly attach it to total · *. Ö0Ö8U / 07I2 to 5. The method according to any one of claims 1-4, characterized in that exhaust gases from the combustion chamber filtered or cleaned by guiding them through at least one of the particle curtains will. 6. The method according to claim 5, characterized in that the gases are purified by that they are passed through at least one special particle curtain. 7. Method according to one of the claims 1-6, characterized in that magnetic powder material is mixed into a powdery material, the Main part is non-magnetic. 8. Modification of the method according to claim 1, characterized in that instead of powdery! Material used in the curtains is related to liquid material, e.g. molten pig iron with the manufacture of steel from robeisen. 9. Device for cooling a combustion chamber by means of powder or liquid material in one or more curtains for carrying out the method according to one of claims 1-8, characterized in that that revolving disks, bodies or other members absorb the said material and counter it hurl or blow one or more baffles arranged to remove the coarser particles of the material flow after one or more layers - ² - 809SU / 07I2 BATH ORIGINAL ten or curtains in the immediate vicinity of the surface of the Shiraz or the surface of the Schirae deflect and the smaller particles after one or more layers or curtains closer distract the center of the combustion chamber. 10. The device according to claim 9, characterized by a device for feeding the powdery material to the floating links through a hollow roughness between an inner ualauf- j bar shaft for the Ualauf the links and an outer cooling jacket or an outer cooling wall. 11. The device according to claim 9, characterized by a device for supplying the pulverföraigen Material to the ualaufbaren links through a hollow, arranged for the Ualauf these links ual on bible wave. 12. Device according to one of claims 8-11, characterized in that a fixed or combined a with the terms that can be resolved, the term "kUhIsfstea" j arranged for cooling these members and optionally also for cooling a Ualaufsfsteas arranged for them is. 13. Device according to one of claims 8-12, for the work ait aagnetisohea, pulverföraigen material, characterized by a device for spontaneous generation of a magnetic field, including a magnetic field Material a wear layer on the deflection screen and possibly on moving parts of a drive 909814 / 07.2 ^, ^ Direction for the mentioned ualaufbaren links au eye. 14. Device according to claim 13 »characterized in that there is an Oebersug au · keraalscbea, anti-tampering material on the deflector and / or on one or more of the executable Limbs attached iat. 15. Device according to claim 13 or 14, characterized in that there is an a · deflector and / or one or more of the linkages that can be run up feetkleendea or festslnterades or in other White adhesive material as a coating on the bira and / or attached to the limbs. 16. Device according to one of the claims 8-15, characterized by a device for feeding a whole series of blankets made from pulTerforal-Ι * ββ ! §. * £: rxl in the StrDaungebabn for von de · VerbireiiMragarau · sifting gases, we clean this su 17. Device according to one of patent claims 8-16, characterized by a device for the Oalauf the best for one or more of the curtains Material, for example, in the wall of the shroud 18. Device according to claim 0, geksi Rewarded by a device for the legs long of the distribution of viscben fine and coarse particles la curtain or in the curtains, see B. by the fact that the Drehsah1 BATH ORIGINAL 9098U / 0782 a drive device for the circulation of said Organs adjustable let. 19. Device according to one of the claims 8-18, characterized in that the drainable Beateben limbs from circulating nozzles or the like or they contain the essential ingredients for blowing in or centrifuging the powder in a horizontal direction towards the combustion chamber. 20. Device according to one of claims 8-18, J. characterized in that several groups of the revolvable members are laterally of one another in an elongated Combustion chamber are arranged. 21. Modification of the device according to claim 9 for carrying out the method according to claim 1-8, characterized in that an overflow or the like on the upper part of the combustion chambers for the liquid material is arranged so that it is in the combustion chamber as one or more enclosing ones or cooling curtains pouring down. I. - β 90 * SU / 07ia