EP0619458B1 - Rotary furnace burner using finely granulated solid fuel - Google Patents
Rotary furnace burner using finely granulated solid fuel Download PDFInfo
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- EP0619458B1 EP0619458B1 EP19940104049 EP94104049A EP0619458B1 EP 0619458 B1 EP0619458 B1 EP 0619458B1 EP 19940104049 EP19940104049 EP 19940104049 EP 94104049 A EP94104049 A EP 94104049A EP 0619458 B1 EP0619458 B1 EP 0619458B1
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- ceramic
- solid fuel
- annular gap
- gap nozzle
- burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
Definitions
- the invention relates to a burner for a rotary kiln, with a ring-shaped channel for the pneumatic transport of fine-grained Solid fuel (coal dust) concentric from a primary air ring duct is surrounded by its distributed around the circumference Outlet jets exit primary air jets at increased speed.
- Rotary kiln burners of this type are mostly known as three-channel burners trained (DE-PS 30 27 587 Fig. 5 and 6), d. H. through the middle
- the pneumatically transported coal dust flows through the burner channel emerges through an annular gap nozzle, whereby the outflowing coal dust is surrounded by radially inner and radially outer primary air.
- the radially outer primary air by means of a large number of individual nozzle-like outflow openings in many individual high-speed primary air jets divided into their Create a negative pressure area, i.e. the many high-speed primary air jets serve as driving jets based on the injector principle, through which the great mass of the rotary kiln burner surrounding, practically still hot secondary air of approx.
- the annular gap nozzle is subject to through which the abrasive coal dust is conveyed pneumatically is a special wear, especially when the annular gap nozzle is conical and diverges outwards. It is an area at risk of wear, especially the inner conical annular gap boundary wall, on which the coal dust particles bounce at high speed while deflecting their flow direction.
- the invention has for its object a rotary kiln burner for fixed To create fuels like fine-grained coal dust with one Coal dust nozzle, which ensures a long service life of the burner.
- the wear protection of the coal dust annular gap nozzle does not consist of a wear protection coating which is applied as a comparatively thin layer directly to the nozzle wall which is at risk of wear, but of a rigid sleeve-like ceramic body, which is thereby releasably and interchangeably attached to a metallic support body in that between the ceramic body and the support body, a flexible ceramic fiber layer is arranged, for. B. an Al 2 O 3 fiber fleece. This makes it possible to connect the ceramic body to the metallic support body in such a way that the thermal expansion of the metal does not have a negative effect on the break-sensitive ceramic body, which may have a Mohs' hardness of> 9.
- the flexible ceramic fiber layer ensures that the wear-resistant ceramic body, which can be thick-walled in comparison to a wear protection coating and can therefore have a very long service life, can be centered exactly on its support body (22) and clamped against it.
- the service life of the z. B. 4 mm thick-walled sleeve-like interchangeable ceramic body is so high that production downtimes of the rotary kiln operation, previously forced by the replacement of worn parts of the coal dust annular gap nozzle can be avoided entirely.
- the Solid fuel annular gap nozzle Seen in the direction of flow of the coal dust suspension, the Solid fuel annular gap nozzle to the outside, is the ceramic body as a ceramic cone on the radially inner boundary wall, which is particularly susceptible to wear the annular gap nozzle is also conical trained metallic support body attached.
- the rotary kiln burner of FIG. 1 has an annular channel (10) for pneumatic transport of fine-grained coal dust.
- the coal dust primary air suspension (11) occurs at a speed of e.g. B. 28 m / s an annular gap nozzle (12) which diverges outwards at a small angle.
- An annular channel (13) is arranged concentrically around the coal dust channel (10), flows through the primary air, the high speed of z. B. 350 m / s in the form of nozzle jets (14) from individual around the circumference of the Burner orifice distributed burner nozzles (15) emerges.
- the area marked with circle II of the coal dust annular gap nozzle (12) is particularly at risk of wear, because in this area the coal dust particles strike the radially inner boundary wall of the annular gap nozzle (12) and are deflected from there to the outside. Therefore, as can be seen in particular from FIG. 2, on the radially inner boundary wall of the annular gap nozzle (12) an inherently rigid ceramic body (21) as a ceramic cone is detachably and exchangeably attached to a metallic support body (22). Between the z. B. 4 mm wall thickness sleeve-like ceramic body (21) and the metallic support body (22) is a z. B. 2 to 3 mm thick flexible ceramic fiber layer (23) arranged, consisting, for. B. from an Al 2 O 3 fiber fleece.
- the flexible ceramic fiber layer By means of the flexible ceramic fiber layer, no forces from the thermal expansion of the metallic support body (22) on the break-sensitive, also z. B. Al 2 O 3 existing ceramic body (21) can be transferred, which can have a Mohs hardness of greater than 9. At the same time, the ceramic fiber layer (23) ensures that the ceramic body (21) can be centered exactly on its supporting body (22).
- the metallic support body consists of two longitudinal sections (22, 22a), the longitudinal section (22a) facing away from the annular gap nozzle mouth (12) having an annular shoulder (24) with which the ceramic cone (21) acts as a stop its support body (22 / 22a) or on the flexible ceramic fiber layer (23) can be centered and tensioned.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Description
Die Erfindung betrifft einen Brenner für einen Drehrohrofen, mit einem ringförmig angeordneten Kanal zum pneumatischen Transport von feinkörnigem Festbrennstoff (Kohlenstaub), der konzentrisch von einem Primärluft-Ringkanal umgeben ist, durch dessen um den Umfang verteilten Austrittsdüsen Primärluftstrahlen mit erhöhter Geschwindigkeit austreten.The invention relates to a burner for a rotary kiln, with a ring-shaped channel for the pneumatic transport of fine-grained Solid fuel (coal dust) concentric from a primary air ring duct is surrounded by its distributed around the circumference Outlet jets exit primary air jets at increased speed.
Drehofenbrenner dieser Art sind meist als sogenannte Dreikanalbrenner ausgebildet (DE-PS 30 27 587 Fig. 5 und 6), d. h. durch den mittleren Brennerkanal strömt der pneumatisch transportierte Kohlenstaub und er tritt durch eine Ringspaltdüse aus, wobei der ausströmende Kohlenstaub von radial innerer als auch von radial äußerer Primärluft umgeben ist. Beim bekannten Kohlenstaubbrenner wird die radial äußere Primärluft mittels einer Vielzahl einzelner düsenartiger Ausströmöffnungen in viele einzelne Hochgeschwindigkeits-Primärluftstrahlen unterteilt, die in ihrer Umgebung ein Unterdruckgebiet erzeugen, d.h. die vielen Hochgeschwindigkeits-Primärluftstrahlen dienen als Treibstrahlen nach dem Injektorprinzip, durch welches die große Masse der den Drehofenbrenner umgebenden, praktisch ruhenden heißen Sekundärluft von ca. 800°C nach innen in Richtung zum Kern der Brennerflamme eingesaugt wird, wo eine intensive Durchmischung der heißen Sekundärluft mit dem durch die Ringspaltdüse austretenden Kohlenstaub stattfindet, der auf diese Weise schnell und vollständig unter Ausbildung einer kurzen heißen Flamme verbrennt, wie sie in der Sinterzone eines Drehrohrofens zur Sinterung des kalzinierten Zementrohmehles zu Zementklinker erforderlich ist. Auf diese Weise gelingt es, mit möglichst wenig kalter Primärluft (z. B. ca. 5 Vol.-%) möglichst viel heiße Sekundärluft (z. B. ca. 95 Vol.-%) in den Kern der Brennerflamme zwecks schneller und vollständiger Kohlenstaubverbrennung einzusaugen. Rotary kiln burners of this type are mostly known as three-channel burners trained (DE-PS 30 27 587 Fig. 5 and 6), d. H. through the middle The pneumatically transported coal dust flows through the burner channel emerges through an annular gap nozzle, whereby the outflowing coal dust is surrounded by radially inner and radially outer primary air. In the known coal dust burner, the radially outer primary air by means of a large number of individual nozzle-like outflow openings in many individual high-speed primary air jets divided into their Create a negative pressure area, i.e. the many high-speed primary air jets serve as driving jets based on the injector principle, through which the great mass of the rotary kiln burner surrounding, practically still hot secondary air of approx. 800 ° C is sucked in towards the core of the burner flame, where an intensive mixing of the hot secondary air with the through the annular gap nozzle emerging coal dust takes place on this Way quickly and completely with the formation of a short hot Flame burns like that in the sintering zone of a rotary kiln Sintering of the calcined cement raw material to cement clinker required is. In this way it is possible with as little cold primary air as possible (e.g. approx. 5 vol.%) as much hot secondary air as possible (e.g. approx. 95 vol.%) into the core of the burner flame for the purpose of being faster and more complete Intake coal dust combustion.
Bei einem solchen Kohlenstaubbrenner unterliegt die Ringspaltdüse, durch welche hindurch der abrasive Kohlenstaub pneumatisch gefördert wird, einem besonderen Verschleiß, insbesondere dann, wenn die Ringspaltdüse konisch ausgebildet ist und nach außen divergiert. Dabei ist ein verschleißgefährdeter Bereich vor allem die innere konische Ringspaltdüsen-Begrenzungswandung, auf welche die Kohlenstaubpartikel unter Ablenkung ihrer Strömungsrichtung mit hoher Geschwindigkeit aufprallen.In such a coal dust burner, the annular gap nozzle is subject to through which the abrasive coal dust is conveyed pneumatically is a special wear, especially when the annular gap nozzle is conical and diverges outwards. It is an area at risk of wear, especially the inner conical annular gap boundary wall, on which the coal dust particles bounce at high speed while deflecting their flow direction.
Bei einem anderen bekannten Kohlenstaubbrenner (Patent Abstracts of Japan Publication No. JP 58011308 vom 22.01.1983) handelt es sich nicht um einen Drehofenbrenner, denn es fehlt jeder Hinweis auf den Einsatz in einem Drehrohrofen und vor allem jeder Hinweis auf eine große Masse heißer Sekundärluft, die diesen bekannten Kohlenstaubbrenner außen umgeben würde. Vielmehr wird beim bekannten Kohlenstaubbrenner, bei welchem die Kohlenstaub-Luftsuspension durch einen Ringkanal transportiert wird, die Verbrennungsluft einzig und allein durch den zentralen Rohrkanal geleitet, wie es bei einem Brenner z. B. für den Einsatz in Dampferzeugern, nicht aber in einem Drehrohrofen der Fall ist. Der ringförmige Kohlenstaubkanal ist im Bereich seiner Ausmündung allseitig, d. h. sowohl radial außen als auch radial innen mit Keramik ausgekleidet, wobei ebenfalls aus Keramik bestehende radial angeordnete Abstandshalter für die Konzentrizität der beiden Rohrkanäle sorgen. Eine unmittelbare Befestigung von Keramikkomponenten auf der Innenoberfläche oder Außenoberfläche eines metallischen Tragrohres kann aber keine brauchbare Lebensdauer aufweisen, denn bei herrschenden Temperaturen von z. B. über 800°C, wie im Einsatzfall Drehrohrofen der Fall, treten die ganz unterschiedlichen Wärmedehnungen zwischen Metall einerseits und Keramik andererseits auf, wobei die Bruchempfindlichkeit von Keramik Wärmedehnungen nicht zuläßt. D. h., beim bekannten Kohlenstaubbrenner sind keine Maßnahmen dagegen getroffen worden, daß sich die Ausdehnung der metallischen Komponenten negativ auswirkt auf die eingesetzten Keramikkomponenten. Der bekannte Kohlenstaubbrenner kann also nicht als Drehofenbrenner eingesetzt werden. In another known coal dust burner (Patent Abstracts of Japan Publication No. JP 58011308 dated January 22, 1983) not a rotary kiln burner, because there is no reference to the Use in a rotary kiln and above all any reference to one large mass of hot secondary air, the well-known coal dust burner would surround the outside. Rather, in the known coal dust burner, in which the coal dust air suspension by a Ring channel is transported, the combustion air only through passed the central pipe channel, as it is in a burner z. B. for the Use in steam generators, but not in a rotary kiln. The annular coal dust channel is on all sides in the area of its mouth, d. H. both radially outside and radially inside lined with ceramic, whereby also made of ceramic arranged radially Spacers ensure the concentricity of the two pipe channels. A Immediate fastening of ceramic components on the inner surface or outer surface of a metallic support tube can have no useful lifespan, because at prevailing temperatures from Z. B. above 800 ° C, as in the case of the rotary kiln Case, the very different thermal expansions occur between metal on the one hand and ceramics on the other, with the sensitivity to breakage of ceramic thermal expansion. That is, in the known Coal dust burner no measures have been taken against it that the expansion of the metallic components is negative affects the ceramic components used. The well-known coal dust burner cannot be used as a rotary kiln burner.
Der Erfindung liegt die Aufgabe zugrunde, einen Drehofenbrenner für feste Brennstoffe wie feinkömigen Kohlenstaub zu schaffen, mit einer Kohlenstaubdüse, die eine lange Standzeit des Brenners gewährleistet.The invention has for its object a rotary kiln burner for fixed To create fuels like fine-grained coal dust with one Coal dust nozzle, which ensures a long service life of the burner.
Diese Aufgabe wird erfindungsgemäß mit den Maßnahmen des Kennzeichnungsteils des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben.This object is achieved according to the measures of the marking part of claim 1 solved. Advantageous configurations are specified in the subclaims.
Beim erfindungsgemäßen Drehofenbrenner besteht der Verschleißschutz der Kohlenstaub-Ringspaltdüse nicht aus einer Verschleißschutzbeschichtung, die als vergleichsweise dünne Schicht unmittelbar auf die verschleißgefährdete Düsenwandung aufgebracht ist, sondern aus einem in sich steifen hülsenartigen Keramikkörper, der auf einem metallischen Tragkörper dadurch lösbar und auswechselbar befestigt ist, daß zwischen dem Keramikkörper und dem Tragkörper eine flexible Keramikfaserschicht angeordnet ist, z. B. ein Al2O3-Faservlies. Dadurch gelingt es, den Keramikkörper in der Weise mit dem metallischen Tragkörper zu verbinden, daß sich die Wärmeausdehnung des Metalls nicht negativ auf den bruchempfindlichen Keramikkörper auswirkt, der eine Mohs'sche Härte von > 9 aufweisen kann. Gleichzeitig sorgt die flexible Keramikfaserschicht dafür, daß der verschleißfeste Keramikkörper, der im Vergleich zu einer Verschleißschutzbeschichtung dickwandig sein kann und daher eine sehr lange Standzeit aufweisen kann, ganz genau auf seinen Tragkörper (22) zentrierbar und gegen diesen spannbar ist. Die Standzeit des z. B. 4 mm dickwandigen hülsenartigen auswechselbaren Keramikkörpers ist so hoch, daß Produktionsausfälle des Drehofenbetriebes, bisher erzwungen durch das Auswechseln verschlissener Teile der Kohlenstaub-Ringspaltdüse ganz vermieden werden können.In the rotary kiln burner according to the invention, the wear protection of the coal dust annular gap nozzle does not consist of a wear protection coating which is applied as a comparatively thin layer directly to the nozzle wall which is at risk of wear, but of a rigid sleeve-like ceramic body, which is thereby releasably and interchangeably attached to a metallic support body in that between the ceramic body and the support body, a flexible ceramic fiber layer is arranged, for. B. an Al 2 O 3 fiber fleece. This makes it possible to connect the ceramic body to the metallic support body in such a way that the thermal expansion of the metal does not have a negative effect on the break-sensitive ceramic body, which may have a Mohs' hardness of> 9. At the same time, the flexible ceramic fiber layer ensures that the wear-resistant ceramic body, which can be thick-walled in comparison to a wear protection coating and can therefore have a very long service life, can be centered exactly on its support body (22) and clamped against it. The service life of the z. B. 4 mm thick-walled sleeve-like interchangeable ceramic body is so high that production downtimes of the rotary kiln operation, previously forced by the replacement of worn parts of the coal dust annular gap nozzle can be avoided entirely.
Divergiert in Strömungsrichtung der Kohlenstaubsuspension gesehen die Festbrennstoff-Ringspaltdüse nach außen, ist der Keramikkörper als Keramik-Konus an der besonders verschleißgefährdeten- radial inneren Begrenzungswandung der Ringspaltdüse am entsprechend ebenfalls konisch ausgebildeten metallischen Tragkörper befestigt. Seen in the direction of flow of the coal dust suspension, the Solid fuel annular gap nozzle to the outside, is the ceramic body as a ceramic cone on the radially inner boundary wall, which is particularly susceptible to wear the annular gap nozzle is also conical trained metallic support body attached.
Die Erfindung und deren weitere Merkmale und Vorteile werden anhand des in den Figuren schematisch dargestellten Ausführungsbeispieles näher erläutert. The invention and its further features and advantages are based on of the embodiment shown schematically in the figures explained.
Es zeigt
- Fig. 1:
- einen Axiallangsschnitt durch einen erfindungsgemäßen Drehofenbrenner, und
- Fig. 2:
- die Einzelheit II der Fig. 1 mit dem Verschleißschutz in vergrößerter Darstellung.
- Fig. 1:
- an axial longitudinal section through a rotary kiln according to the invention, and
- Fig. 2:
- the detail II of FIG. 1 with the wear protection in an enlarged view.
Der Drehofenbrenner der Fig. 1 weist einen ringförmigen Kanal (10) zum pneumatischen Transport von feinkörnigem Kohlenstaub auf. Die Kohlenstaub-Primärluft-Suspension (11) tritt mit einer Geschwindigkeit von z. B. 28 m/s aus einer Ringspaltdüse (12) aus, die mit einem kleinen Winkel nach außen divergiert. Konzentrisch um den Kohlenstaubkanal (10) ist ein Ringkanal (13) angeordnet, durch den Primärluft strömt, die mit hoher Geschwindigkeit von z. B. 350 m/s in Form von Düsenstrahlen (14) aus einzelnen um den Umfang der Brennermündung verteilt angeordneten Brennerdüsen (15) austritt. Diese Hochgeschwindigkeits-Primärluftstrahlen (14) bzw. Treibstrahlen hoher Geschwindigkeit sind in der Lage, möglichst viel den Drehofenbrenner umgebende heiße Sekundärluft (16) von z. B. 800 °C in den Kern der Brennerflamme zwecks schneller und vollständiger Kohlenstaubverbrennung einzusaugen. Auf seiner Außenseite ist der Drehofenbrenner durch eine feuerfeste Ausmauerung (17) vor thermische Überbeanspruchung geschützt. Konzentrisch innerhalb des Kohlenstaubkanals (10) kann ein weiterer Primärluftkanal (18) angeordnet sein, der an seiner Ausmündung mit einem Drallerzeuger (19) ausgestattet sein kann. Im Zentrum des Brenners ist noch ein Rohr (20) angeordnet, in welches ein zentraler Zündbrenner einsetzbar ist.The rotary kiln burner of FIG. 1 has an annular channel (10) for pneumatic transport of fine-grained coal dust. The coal dust primary air suspension (11) occurs at a speed of e.g. B. 28 m / s an annular gap nozzle (12) which diverges outwards at a small angle. An annular channel (13) is arranged concentrically around the coal dust channel (10), flows through the primary air, the high speed of z. B. 350 m / s in the form of nozzle jets (14) from individual around the circumference of the Burner orifice distributed burner nozzles (15) emerges. These high-speed primary air jets (14) or high-speed driving jets are able to get as much hot as possible surrounding the rotary kiln burner Secondary air (16) from z. B. 800 ° C in the core of the burner flame for the purpose suck in faster and complete combustion of coal dust. On his The outside is the rotary kiln burner thanks to a fireproof lining (17) protected against thermal overload. Concentric within the A further primary air duct (18) can be arranged in the coal dust duct (10), which can be equipped with a swirl generator (19) at its mouth. In the center of the burner there is also a tube (20) into which a central pilot burner can be used.
Der mit dem Kreis II der Kohlenstaub-Ringspaltdüse (12) gekennzeichnete Bereich ist besonders verschleißgefährdet, weil in diesem Bereich die Kohlenstaubpartikel an der radial inneren Begrenzungswandung der Ringspaltdüse (12) aufprallen und von dort nach außen abgelenkt werden. Daher ist, wie insbesondere aus Fig. 2 zu ersehen, an der radial inneren Begrenzungswandung der Ringspaltdüse (12) ein in sich steifer Keramikkörper (21) als Keramik-Konus an einem metallischen Tragkörper (22) lösbar und auswechselbar befestigt. Zwischen dem z. B. 4 mm Wandstärke aufweisenden hülsenartigen Keramikkörper (21) und dem metallischen Tragkörper (22) ist eine z. B. 2 bis 3 mm dicke flexible Keramikfaserschicht (23) angeordnet, bestehend z. B. aus einem Al2O3-Faservlies. Vermittels der flexiblen Keramikfaserschicht können keine Kräfte aus der Wärmedehnung des metallischen Tragkörpers (22) auf den bruchempfindlichen, ebenfalls z. B. aus Al2O3 bestehenden Keramikkörper (21) übertragen werden, der eine Mohs'sche Härte von größer 9 aufweisen kann. Gleichzeitig sorgt die Keramikfaserschicht (23) dafür, daß der Keramikkörper (21) ganz genau auf seinen Tragkörper (22) zentrierbar ist. Gemäß Ausführungsbeispiel der Fig. 2 besteht der metallische Tragkörper aus zwei Längsabschnitten (22, 22a), wobei der der Ringspaltdüsenmündung (12) abgewandte Längsabschnitt (22a) eine Ringschulter (24) aufweist, mit der als Anschlag der Keramik-Konus (21) auf seinen Tragkörper (22/22a) bzw. auf die flexible Keramikfaserschicht (23) zentrierbar und spannbar ist.The area marked with circle II of the coal dust annular gap nozzle (12) is particularly at risk of wear, because in this area the coal dust particles strike the radially inner boundary wall of the annular gap nozzle (12) and are deflected from there to the outside. Therefore, as can be seen in particular from FIG. 2, on the radially inner boundary wall of the annular gap nozzle (12) an inherently rigid ceramic body (21) as a ceramic cone is detachably and exchangeably attached to a metallic support body (22). Between the z. B. 4 mm wall thickness sleeve-like ceramic body (21) and the metallic support body (22) is a z. B. 2 to 3 mm thick flexible ceramic fiber layer (23) arranged, consisting, for. B. from an Al 2 O 3 fiber fleece. By means of the flexible ceramic fiber layer, no forces from the thermal expansion of the metallic support body (22) on the break-sensitive, also z. B. Al 2 O 3 existing ceramic body (21) can be transferred, which can have a Mohs hardness of greater than 9. At the same time, the ceramic fiber layer (23) ensures that the ceramic body (21) can be centered exactly on its supporting body (22). According to the embodiment of FIG. 2, the metallic support body consists of two longitudinal sections (22, 22a), the longitudinal section (22a) facing away from the annular gap nozzle mouth (12) having an annular shoulder (24) with which the ceramic cone (21) acts as a stop its support body (22 / 22a) or on the flexible ceramic fiber layer (23) can be centered and tensioned.
Ist die Kohlenstaub-Ringspaltdüse (12) nicht nach außen, sondern nach innen divergierend angeordnet, so wäre der in sich feste Keramikkörper (21) nicht an der radial inneren, sondern umgekehrt an der radial äußeren Begrenzungswandung dieser Ringspaltdüse (12) zu befestigen.Is the coal dust annular gap nozzle (12) not inwards, but inwards arranged diverging, the ceramic body (21), which is solid in itself, would not be on the radially inner, but vice versa on the radially outer boundary wall to fix this annular gap nozzle (12).
Es wäre auch möglich, den Ringkanal (18) für die innere Primärluft ganz wegzulassen oder zwischen dem Kohlenstaubkanal (10) und dem äußeren Primärluftkanal (13) anzuordnen.It would also be possible to omit the ring channel (18) for the internal primary air entirely or between the coal dust duct (10) and the outer primary air duct (13) to be arranged.
Claims (4)
- A burner for cylindrical rotary kilns, with a channel (10) arranged in an annular manner for the pneumatic transport of fine-grain solid fuel (carbon dust) and concentrically enveloped by a primary air ring channel (13) with exit nozzles (15) distributed over the circumference through which primary air streams flow with increased speed, characterised in that in the region of its annular gap nozzle (12), through which the suspension of solid fuel and transport air passes, the solid fuel channel (10) is provided with protection against abrasion for at least one of the annular gap nozzle limiting walls, the said protection comprising a ceramic body (21) which is secured to a metallic carrier (22) in a detachable and interchangeable manner with a flexible ceramic fibre layer (23) arranged between the ceramic body (21) and the carrier (22).
- A burner according to claim 1, characterised in that where the solid fuel annular gap nozzle (12) diverges outwardly the ceramic body (21) is in the form of a ceramic cone which is secured to the radial inner limiting wall of the annular gap nozzle (12) through corresponding conical metallic carriers (22).
- A burner according to claim 2, characterised in that the metallic carrier of the ceramic conus (21) comprises two longitudinal sections (22, 22a), wherein the longitudinal section (22a) facing away from the opening of the annular gap nozzle is provided with a ring shoulder (24) which serves as a limit stop to enable the ceramic cone (21) to be centred and tensioned on its carrier (22) and on the flexible ceramic fibre layer (23).
- A burner according to one or more of claims 1 to 3, characterised in that a further primary air channel (18) is arranged radially within the solid fuel channel (10) and has a torsion generator (19) arranged on its exit opening.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934311457 DE4311457A1 (en) | 1993-04-08 | 1993-04-08 | Rotary kiln burner for fine-grained solid fuel |
| DE4311457 | 1993-04-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0619458A1 EP0619458A1 (en) | 1994-10-12 |
| EP0619458B1 true EP0619458B1 (en) | 1998-04-22 |
Family
ID=6484980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19940104049 Expired - Lifetime EP0619458B1 (en) | 1993-04-08 | 1994-03-16 | Rotary furnace burner using finely granulated solid fuel |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0619458B1 (en) |
| DE (2) | DE4311457A1 (en) |
| DK (1) | DK0619458T3 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT402440B (en) * | 1995-06-01 | 1997-05-26 | Voest Alpine Ind Anlagen | BURNER |
| DE69730702T3 (en) | 1996-12-27 | 2009-01-22 | Sumitomo Osaka Cement Co., Ltd. | DEVICE AND METHOD FOR COMBUSING FUEL |
| CN101334171B (en) * | 2008-07-16 | 2010-10-13 | 宜兴市瑞晶炉料有限公司 | Burner brick for industrial kiln |
| CN103791495B (en) * | 2014-02-25 | 2016-09-07 | 中国建筑材料科学研究总院 | Oxygen-enriched low-NOx pulverized coal burner and application thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3027587A1 (en) * | 1980-07-21 | 1982-02-25 | Klöckner-Humboldt-Deutz AG, 5000 Köln | BURNER FOR SOLID FUELS |
| JPS5811308A (en) * | 1981-07-14 | 1983-01-22 | Sumitomo Cement Co Ltd | Pulverized coal combustion burner |
| JP2641738B2 (en) * | 1987-10-07 | 1997-08-20 | バブコツク日立株式会社 | Pulverized coal combustion equipment |
| DE3738064A1 (en) * | 1987-11-09 | 1989-05-24 | Stubinen Utvecklings Ab | DEVICE FOR BURNING SOLID FUELS, IN PARTICULAR COAL, Peat, OR THE LIKE, IN POWDERED FORM |
| DE4103850A1 (en) * | 1991-02-08 | 1992-08-13 | Wahl Verschleiss Tech | Ring for combustion nozzle of coal fired power station - has replaceable guide vanes made of wear resistant material |
-
1993
- 1993-04-08 DE DE19934311457 patent/DE4311457A1/en not_active Withdrawn
-
1994
- 1994-03-16 DE DE59405746T patent/DE59405746D1/en not_active Expired - Fee Related
- 1994-03-16 EP EP19940104049 patent/EP0619458B1/en not_active Expired - Lifetime
- 1994-03-16 DK DK94104049T patent/DK0619458T3/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DE4311457A1 (en) | 1994-10-13 |
| EP0619458A1 (en) | 1994-10-12 |
| DK0619458T3 (en) | 1999-01-04 |
| DE59405746D1 (en) | 1998-05-28 |
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