EP1445565A1 - Drehrohrofen mit Längsabdichtung des Beheizungstunnels sowie Verfahren zum Herstellen einer solchen Längsabdichtung - Google Patents
Drehrohrofen mit Längsabdichtung des Beheizungstunnels sowie Verfahren zum Herstellen einer solchen Längsabdichtung Download PDFInfo
- Publication number
- EP1445565A1 EP1445565A1 EP04001057A EP04001057A EP1445565A1 EP 1445565 A1 EP1445565 A1 EP 1445565A1 EP 04001057 A EP04001057 A EP 04001057A EP 04001057 A EP04001057 A EP 04001057A EP 1445565 A1 EP1445565 A1 EP 1445565A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary tube
- rotary
- strips
- flexible part
- tunnel
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000007789 sealing Methods 0.000 title description 7
- 238000005192 partition Methods 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000013013 elastic material Substances 0.000 claims 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
- F27B7/22—Rotary drums; Supports therefor
- F27B7/24—Seals between rotary and stationary parts
Definitions
- the present invention relates to a rotary kiln with a longitudinal seal within a heating tunnel surrounding a shell that can be heated from the outside, and to a method for producing such a longitudinal seal according to the preamble of claim 7.
- High temperatures are usually used in rotary kilns.
- the rotary tube can be indirectly heated to the desired temperature with a heating medium (such as hot gas or hot air) in order to ensure that the temperatures inside the rotary tube are sufficiently high (several 100 ° C, sometimes> 1000 ° C) for the temperatures that run inside chemical or other desired processes.
- the rotary tube is usually surrounded by a heating tunnel, as shown schematically in FIG. 1, which shows a schematic cross section through a rotary tube furnace according to the prior art.
- the heating tunnel 12 which surrounds the rotating tube 10 rotating in the direction of arrow C (or in the opposite direction) in the manner of a housing, has, over its entire length, a plurality of burners 14, which indirectly heat the rotating tube, and gas outlets 16.
- a heating medium such as. B. introduced hot gas, which flows around the circumference of the rotary tube (also called rotary drum) and thus heats up.
- the gas can flow around the bottom of the rotary tube (as shown by arrow A) as well as on the top (as shown by arrow B).
- the efficiency is much higher with a flow around the top because the gas dwell time on the rotating tube surface is longer and therefore there is more time for heat exchange.
- a larger surface area of the rotary tube can be flowed around.
- the rotary tube is shown schematically circular in Fig. 1. However, this is not the reality. Since such a rotary tube extends over several meters, sometimes up to 100 m long, it is technically almost impossible to guarantee a completely circular profile over this entire route. In addition, the rotary tube will have a certain imbalance.
- a rotary kiln with the features of the claim 1 suggested.
- the invention is based on the basic idea for a rotary kiln in which a rotary tube is shell-shaped from a heating tunnel is surrounded, preferably extending below the rotary tube, To create longitudinal sealing that has a rigid part and a flexible part.
- the flexible part of the longitudinal seal which is preferably on the rotary tube is constantly in contact with the unbalance and / or profile change of the Adjust rotary tube and thus an essentially impermeable longitudinal seal to ensure the rotary tube to the heating tunnel wall.
- This longitudinal seal has a favorable effect on the heat transfer the rotary tube wall, as this is constantly subjected to brush-like cleaning.
- Such a longitudinal seal can by the described in claim 7 Processes are made.
- a rotary kiln includes a Rotary tube 30, which is in a shell-like surrounding the rotary tube stationary heating tunnel 32 is rotatable, the heating tunnel Rotary tube usually surrounds a substantial portion of its length.
- the heating tunnel wall 32A has at least one inlet 34 for a heating medium (such as hot air or hot gas) and at least one outlet 36.
- Inlet and outlet are as shown in FIG. 4 and preferred in so far as elongated recesses or openings arranged on the side walls of the heating tunnel; these are also in the form of in one Tunnels or inlet pipes provided can be provided.
- the entire length of the rotary tube is from Heating medium flows around.
- the main flow direction of the heating medium is in the direction of flow arrows B, i.e. perpendicular to the axis of the rotary tube.
- the heating system can be done both in and opposite to the direction of rotation of the rotary tube.
- the heating tunnel formed between tunnel wall 32A and rotary tube 30 is usually 32 sealed on the front, e.g. to escape the heating medium except to prevent through the outlet 36 (Fig.3).
- the rotary tube can be from be completely surrounded by the heating tunnel or laterally above it protrude.
- the longitudinal seal 20 is located essentially below the rotary tube. As can be seen from the embodiment according to FIGS. 2-4, and to this extent preferably as a partition between the inlet side 38 and outlet side 40 of the heating tunnel 32 formed.
- the longitudinal seal 20 consists of a rigid part 22 and a flexible part 24 thereon.
- the longitudinal seal 20 consists of a flat, long wall with a case or several flexible sealing elements attached to it. The wall stretches preferably along the full length of the heating tunnel 32 and connects to the end walls 32B of the same, as in FIGS. 3 and 4 seen. A flow around the face of the longitudinal seal is thus achieved the heating medium prevents.
- the longitudinal seal 20 in this embodiment have a width of about 10-20% of the diameter of the rotary tube.
- the width of the longitudinal seal can also be smaller depending on the requirements or larger can be selected.
- the rigid part 22 is preferably made of masonry. However, it also comes any other rigid or refractory material in question, which the in the heating tunnel withstands occurring temperatures.
- the rigid part 22 can As indicated in Figure 2, extend so close to the rotary tube 30 that it from this is no longer detected when the rotary tube rotates. When establishing of the rigid part, make sure that the rotary tube is in operation when the Furnace due to the previously described inaccuracy in the rotary tube profile as well will not run exactly due to unbalance.
- the flexible part 24 is located at the end of the rigid part 22 on the side of the rotary tube.
- This preferably consists of a material that is so flexible that it can be adjusts the inaccuracies of the rotary tube profile when turning the rotary tube. moreover it should be the temperatures inside the heating tunnel withstand.
- the flexible part preferably consists for the most part made of ceramic fiber.
- the flexible part preferably consists of joined together Strips and / or stripe packages of a flexible material. This are preferably arranged at right angles to the axis of the rotary tube, which is a certain Minimum thickness of the longitudinal seal 20 is required. This arrangement ensures on the one hand an improved seal and on the other hand a longer service life the seal.
- the individual strips can be used to increase the tightness and / or strip packs also glued to one another or otherwise to one another be attached.
- the flexible part 24 is preferred by pressing individual Strips and / or strip packages between the rigid part 22 and the rotary tube 30 manufactured. As required, it is with the rigid part 22, as by gluing, connected.
- the individual strips and / or Strip packets compressed vertically and in their stacking direction. This ensures that even after prolonged operation and corresponding wear, the seal works in a satisfactory manner. It also prevents by rotating the rotary tube individual parts of the longitudinal sealing of be removed from their specific position.
- the strip packs consist of 25 mm thick, at least 75 mm high and about 34.5 cm wide ceramic fiber mats (KT 1430 ° C, RG approx. 200 kg per sqm), which are compressed to 20 mm. If If desired, several strips can be stacked on top of one another as strips rigid part 22 and rotary tube 30 are pressed. By pressing in it is possible to influence the flexibility of the flexible part 24. It is also possible, first apply a somewhat inflexible layer to the rigid part 22 and then a more flexible material. In the same way, of course rigid part 22 of several layers arranged on and / or next to one another or layers of different materials.
- Strips of flexible material run parallel to the longitudinal sealing wall. This is particularly advantageous if the flexible part on the inlet side of the Heating tunnels should have different material properties than on the Exhaust side - for example due to the different temperatures. In this case the press-in process would have to be modified accordingly. Also would come here again several layers of flexible material in question.
- the flexible part 24 by pressing in strips and / or strip packages between the rigid part 22 and the rotary tube 30, is the flexible part adaptable to the outer surface of the rotary tube during its manufacture. Consequently can take into account inaccuracies and / or fluctuations in the rotary tube profile be taken, e.g. B. if a rotary tube (such as through a weld or similar) has a slightly larger outer diameter at one point.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
Description
In Drehrohröfen werden üblicherweise hohe Temperaturen angewendet. Das Drehrohr kann hierzu mit einem Heizmedium (wie z. B. heißes Gas oder heiße Luft) indirekt auf die gewünschte Temperatur aufgeheizt werden, um im Drehrohrinneren die genügend hohen Temperaturen (mehrere 100°C, teilweise > 1000° C) für die darin ablaufenden chemischen oder anderen gewünschten Prozesse zu erreichen. Das Drehrohr ist hierzu üblicherweise von einem Beheizungstunnel umgeben, wie in Fig. 1 - schematisch - dargestellt, welche einen schematischen Querschnitt durch einen Drehrohrofen nach dem Stand der Technik zeigt. Der das in Pfeilrichtung C (oder entgegengesetzt) sich drehende Drehrohr 10 gehäuseartig umgebende Beheizungstunnel 12 weist auf seiner gesamten Länge mehrere Brenner 14, welche das Drehrohr indirekt beheizen, sowie Gasauslässe 16 auf. Durch die Gaseinlässe 14A wird ein Heizmedium wie z. B. heißes Gas eingeleitet, welches das Drehrohr (auch Drehtrommel genannt) umfangsmäßig umströmt und somit aufheizt. Das Gas kann das Drehrohr sowohl unterseitig (wie durch Pfeil A dargestellt) als auch oberseitig (wie durch Pfeil B dargestellt) umströmen. Dabei ist der Wirkungsgrad bei einer oberseitigen Umströmung viel größer, weil die Verweilzeit des Gases an der Drehrohroberfläche länger ist und somit mehr Zeit für einen Wärmeaustausch bleibt. Zudem kann ein größerer Oberflächenanteil des Drehrohrs umströmt werden. Da es einem Teil des Gases jedoch möglich ist, das Drehrohr unterseitig zu umströmen, resultiert dies in einem Effizienzverlust, da bei dieser Umströmung der Wärmeaustausch deutlich geringer ist. Dies auch dann, wenn man an der Drehrohrunterseite eine Engstelle in Gestalt eines Spaltes D vorsieht. In diesem Fall würde die Umströmung entlang Pfeil A' verlaufen.
Das Drehrohr ist in Fig. 1 schematisch kreisrund dargestellt. Dies entspricht jedoch nicht der Realität. Da so ein Drehrohr sich über mehrere Meter, teilweise bis zu 100 m lang streckt, ist es technisch nahezu unmöglich, ein völlig kreisrundes Profil über diese gesamte Strecke zu gewährleisten. Außerdem wird das Drehrohr über eine gewisse Unwucht verfügen.
- Fig. 1
- einen indirekt beheizten Drehrohrofen nach dem Stand der Technik in schematischer Querschnittsansicht;
- Fig. 2
- einen erfindungsgemäßen Drehrohrofen im Vertikalschnitt entlang der Linie II - II gemäß Fig. 4 - schematisch;
- Fig. 3
- denselben Drehrohrofen im Vertikalschnitt entlang der Linie, III - III gemäß Fig. 2 (ausschnittsweise), sowie
- Fig. 4
- denselben Drehrohrofen im Horizontalschnitt entlang der Linie IV - IV gemäß Fig. 2 (ausschnittsweise).
- 10
- Drehrohr
- 12
- Beheizungstunnel
- 14
- Brenner
- 14A
- Einlass
- 16
- Auslass
- 20
- Längs-Abdichtung
- 22
- starrer Teil
- 24
- flexibler Teil
- 30
- Drehrohr
- 32
- Beheizungstunnel
- 32A
- Beheizungstunnelwand
- 32B
- Beheizungstunnelstirnwand
- 34
- Brenner
- 34A
- Einlass
- 34B
- Brenner
- 34C
- Brenner.
- 36
- Auslass
- 38
- Eintrittsseite des Heizmediums
- 40
- Austrittsseite des Heizmediums
- A
- Strömungspfeil
- A'
- Strömungspfeil
- B
- Strömungspfeil
- C
- Drehrichtung
- D
- Spalt
Claims (8)
- Drehrohrofen mit einer Längs-Abdichtung (20) innerhalb eines ein außen beheizbares Drehrohr (30) schalenförmig umgebenden Beheizungstunnels (32) in Gestalt einer zwischen der Tunnelwand (32A) und der Drehrohraußenfläche sich, vorzugsweise unterhalb, des Drehrohrs erstreckenden Trennwand zwischen einer Eintritts- (38) und einer Austrittsseite (40) für das Heizmedium im Beheizungstunnel, bei dem die Trennwand aus einem starren, drehrohrfernen Teil (22) und einem flexiblen, drehrohrnahen Teil (24) besteht.
- Drehrohrofen nach Anspruch 1, dadurch gekennzeichnet, daß der starre Teil (22) aus Mauerwerk und die Mauerkrone aus dem flexiblen Teil (24) besteht.
- Drehrohrofen nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der flexible Teil (24) aus Keramikfaser besteht.
- Drehrohrofen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der flexible Teil (24) aus, ggf. unter Verkleben, aneinandergefügten Streifen eines elastischen, insbesondere kompressiblen, Materials besteht.
- Drehrohrofen nach Anspruch 4, dadurch gekennzeichnet, daß die Streifen mindestens einen Stapel bilden.
- Drehrohrofen nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Streifen des elastischen Materials sich im wesentlichen senkrecht zur Drehrohrachse erstrecken.
- Verfahren zum Herstellen einer Längs-Abdichtung für einen Drehrohrofen, insbesondere mit den Merkmalen eines der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der flexible Teil der Abdichtung aus aneinandergefügten Streifen eines elastischen Materials besteht, die durch Einpressen einzelner Streifen oder Streifenpakete zwischen einer starren Trennwand und der Drehtrommel eingebracht werden.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die Streifen oder Streifenpakete sich im wesentlichen senkrecht zur Drehrohrachse erstrecken und in einer zur Drehrohrachse parallelen Stapelrichtung komprimiert werden.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10305147A DE10305147B4 (de) | 2003-02-08 | 2003-02-08 | Drehrohrofen mit Längsabdichtung des Beheizungstunnels sowie Verfahren zum Herstellen einer solchen Längsabdichtung |
| DE10305147 | 2003-02-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1445565A1 true EP1445565A1 (de) | 2004-08-11 |
| EP1445565B1 EP1445565B1 (de) | 2008-03-12 |
Family
ID=32603204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04001057A Expired - Lifetime EP1445565B1 (de) | 2003-02-08 | 2004-01-20 | Drehrohrofen mit Längsabdichtung des Beheizungstunnels sowie Verfahren zum Herstellen einer solchen Längsabdichtung |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7077645B2 (de) |
| EP (1) | EP1445565B1 (de) |
| AT (1) | ATE389157T1 (de) |
| CA (1) | CA2455465C (de) |
| DE (2) | DE10305147B4 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ299877B6 (cs) * | 2001-08-07 | 2008-12-17 | Arcelormittal Ostrava A.S. | Navíjecí pec a zpusob jejího rízení |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10124445B2 (en) | 2012-01-18 | 2018-11-13 | Halliburton Energy Services, Inc. | Heat containment apparatus |
| US20130180693A1 (en) * | 2012-01-18 | 2013-07-18 | Halliburton Energy Services, Inc. | Heat Containment Apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1451511A1 (de) * | 1963-09-26 | 1969-01-16 | Koppers Wistra Ofenbau Gmbh | Muellverbrennungsanlage |
| DE3236561A1 (de) * | 1982-10-02 | 1984-04-05 | Metallgesellschaft Ag, 6000 Frankfurt | Vorrichtung zum abdichten eines drehrohres |
| US4728289A (en) * | 1987-03-10 | 1988-03-01 | Westinghouse Electric Corp. | Axial seal system for rotary combustor |
| JPH10300358A (ja) * | 1997-04-25 | 1998-11-13 | Mitsubishi Chem Corp | ロータリーキルンのシール装置 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE615033C (de) * | 1932-12-14 | 1935-06-25 | Fried Krupp Grusonwerk Akt Ges | Auf einer Welle angeordnete Metallmuffel |
| DE659979C (de) * | 1936-06-11 | 1938-05-16 | Metallgesellschaft Akt Ges | Umlaufender Muffelofen |
| DE1171326B (de) * | 1958-01-03 | 1964-05-27 | Gypses Et Platres De France Sa | Vorrichtung zur Herstellung von Gips |
| DE1451551A1 (de) | 1963-10-11 | 1969-02-20 | Thermo Technical Dev Ltd | Absperrorgan fuer Rauchgaskanaele und Gasleitungen |
| DE3018572C2 (de) * | 1980-05-14 | 1983-07-21 | Deutsche Kommunal-Anlagen Miete GmbH, 8000 München | Indirekt beheizter Drehrohrofen für die Pyrolyse von Abfallstoffen, bei dem die Pyrolysegase zur Verbrennung dem Brenner des Drehrohrofens zugeführt werden |
| US4804195A (en) * | 1986-12-29 | 1989-02-14 | Parker Thomas H | High temperature sealing device |
| US4961588A (en) * | 1989-01-31 | 1990-10-09 | Westinghouse Electric Corp. | Radial seal |
| US5263724A (en) * | 1989-11-02 | 1993-11-23 | Volund Miljoteknik A/S | Segmented seal for rotary equipment |
| US5173045A (en) * | 1991-09-27 | 1992-12-22 | Westinghouse Electric Corp. | Radial seal for rotary combustor |
| US5383672A (en) * | 1992-08-28 | 1995-01-24 | Pe Flo-Tech, Inc. | Seal structure for rotary kiln |
| DE19542563A1 (de) * | 1995-11-15 | 1997-05-22 | Flender A F & Co | Vorrichtung zur Abdichtung einer Schutzhaube eines Mühlenkörpers |
| DE19720417A1 (de) * | 1997-05-15 | 1998-11-19 | Kurt Kugler | Einrichtung zur indirekten Beheizung von Drehrohröfen |
-
2003
- 2003-02-08 DE DE10305147A patent/DE10305147B4/de not_active Expired - Fee Related
-
2004
- 2004-01-20 EP EP04001057A patent/EP1445565B1/de not_active Expired - Lifetime
- 2004-01-20 DE DE502004006455T patent/DE502004006455D1/de not_active Expired - Lifetime
- 2004-01-20 AT AT04001057T patent/ATE389157T1/de active
- 2004-01-20 CA CA2455465A patent/CA2455465C/en not_active Expired - Fee Related
- 2004-02-06 US US10/774,159 patent/US7077645B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1451511A1 (de) * | 1963-09-26 | 1969-01-16 | Koppers Wistra Ofenbau Gmbh | Muellverbrennungsanlage |
| DE3236561A1 (de) * | 1982-10-02 | 1984-04-05 | Metallgesellschaft Ag, 6000 Frankfurt | Vorrichtung zum abdichten eines drehrohres |
| US4728289A (en) * | 1987-03-10 | 1988-03-01 | Westinghouse Electric Corp. | Axial seal system for rotary combustor |
| JPH10300358A (ja) * | 1997-04-25 | 1998-11-13 | Mitsubishi Chem Corp | ロータリーキルンのシール装置 |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 1999, no. 02 26 February 1999 (1999-02-26) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ299877B6 (cs) * | 2001-08-07 | 2008-12-17 | Arcelormittal Ostrava A.S. | Navíjecí pec a zpusob jejího rízení |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE389157T1 (de) | 2008-03-15 |
| DE10305147A1 (de) | 2004-08-26 |
| DE502004006455D1 (de) | 2008-04-24 |
| EP1445565B1 (de) | 2008-03-12 |
| US7077645B2 (en) | 2006-07-18 |
| CA2455465A1 (en) | 2004-08-08 |
| DE10305147B4 (de) | 2005-03-17 |
| CA2455465C (en) | 2011-09-13 |
| US20050106523A1 (en) | 2005-05-19 |
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