EP0619458B1 - Drehofenbrenner für feinkörnigen Festbrennstoff - Google Patents
Drehofenbrenner für feinkörnigen Festbrennstoff Download PDFInfo
- Publication number
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- ceramic
- solid fuel
- annular gap
- gap nozzle
- burner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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.
Landscapes
- 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
- Fig. 1:
- einen Axiallangsschnitt durch einen erfindungsgemäßen Drehofenbrenner, und
- Fig. 2:
- die Einzelheit II der Fig. 1 mit dem Verschleißschutz in vergrößerter Darstellung.
Claims (4)
- Brenner für einen Drehrohrofen, mit einem ringförmig angeordneten Kanal (10) zum pneumatischen Transport von feinkörnigem Festbrennstoff (Kohlenstaub), der konzentrisch von einem Primärluft-Ringkanal (13) umgeben ist, durch dessen um den Umfang verteilten Austrittsdüsen (15) Primärluftstrahlen mit erhöhter Geschwindigkeit austreten, dadurch gekennzeichnet, daß der Festbrennstoffkanal (10) im Bereich seiner die Festbrennstoff-Transportluft-Suspension auslassenden Ringspaltdüse (12) an wenigstens einer der Ringspaltdüsen-Begrenzungswandungen einen Verschleißschutz aufweist, welcher aus einem Keramikkörper (21) besteht, der auf einem metallischen Tragkörper (22) lösbar und auswechselbar befestigt ist in der Weise, daß zwischen dem Keramikkörper (21) und dem Tragkörper (22) eine flexible Keramikfaserschicht (23) angeordnet ist.
- Brenner nach Anspruch 1, dadurch gekennzeichnet, daß bei der Festbrennstoff-Ringspaltdüse (12), wenn sie nach außen divergiert, der Keramikkörper (21) als Keramik-Konus ausgebildet ist, der an der radial inneren Begrenzungswandung der Ringspaltdüse (12) am entsprechend ebenfalls konisch ausgebildeten metallischen Tragkörper (22) befestigt ist.
- Brenner nach Anspruch 2, dadurch gekennzeichnet, daß der metallische Tragkörper des Keramik-Konusses (21) aus zwei Längsabschnitten (22, 22a) besteht, wobei der der Ringspaltdüsenmündung abgewandte Längsabschnitt (22a) eine Ringschulter (24) aufweist, mit der als Anschlag der Keramik-Konus (21) auf seinen Tragkörper (22) bzw. auf die flexible Keramikfaserschicht (23) zentrierbar und spannbar ist.
- Brenner nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß radial innerhalb des Festbrennstoffkanals (10) ein weiterer Primärluftkanal (18) angeordnet ist, an dessen Ausmündung ein Drallerzeuger (19) angeordnet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4311457 | 1993-04-08 | ||
DE19934311457 DE4311457A1 (de) | 1993-04-08 | 1993-04-08 | Drehofenbrenner für feinkörnigen Festbrennstoff |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0619458A1 EP0619458A1 (de) | 1994-10-12 |
EP0619458B1 true EP0619458B1 (de) | 1998-04-22 |
Family
ID=6484980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940104049 Expired - Lifetime EP0619458B1 (de) | 1993-04-08 | 1994-03-16 | Drehofenbrenner für feinkörnigen Festbrennstoff |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0619458B1 (de) |
DE (2) | DE4311457A1 (de) |
DK (1) | DK0619458T3 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT402440B (de) * | 1995-06-01 | 1997-05-26 | Voest Alpine Ind Anlagen | Brenner |
CN1316197C (zh) | 1996-12-27 | 2007-05-16 | 住友大阪水泥股份有限公司 | 燃料燃烧设备和方法 |
CN101334171B (zh) * | 2008-07-16 | 2010-10-13 | 宜兴市瑞晶炉料有限公司 | 一种工业窑炉用的烧嘴砖 |
CN103791495B (zh) * | 2014-02-25 | 2016-09-07 | 中国建筑材料科学研究总院 | 富氧低NOx煤粉燃烧器及其应用 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3027587A1 (de) * | 1980-07-21 | 1982-02-25 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Brenner fuer feste brennstoffe |
JPS5811308A (ja) * | 1981-07-14 | 1983-01-22 | Sumitomo Cement Co Ltd | 微粉炭燃焼バ−ナ |
JP2641738B2 (ja) * | 1987-10-07 | 1997-08-20 | バブコツク日立株式会社 | 微粉炭燃焼装置 |
DE3738064A1 (de) * | 1987-11-09 | 1989-05-24 | Stubinen Utvecklings Ab | Vorrichtung zum verbrennen fester brennstoffe, insbesondere kohle, torf oder dergleichen, in pulverisierter form |
DE4103850A1 (de) * | 1991-02-08 | 1992-08-13 | Wahl Verschleiss Tech | Duesenring fuer die brennduese eines kohlenkraftwerkes |
-
1993
- 1993-04-08 DE DE19934311457 patent/DE4311457A1/de not_active Withdrawn
-
1994
- 1994-03-16 DK DK94104049T patent/DK0619458T3/da active
- 1994-03-16 EP EP19940104049 patent/EP0619458B1/de not_active Expired - Lifetime
- 1994-03-16 DE DE59405746T patent/DE59405746D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DK0619458T3 (da) | 1999-01-04 |
DE59405746D1 (de) | 1998-05-28 |
DE4311457A1 (de) | 1994-10-13 |
EP0619458A1 (de) | 1994-10-12 |
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