EP0030403B1 - Procédé de séchage et de calcination de matériaux en vrac - Google Patents

Procédé de séchage et de calcination de matériaux en vrac Download PDF

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Publication number
EP0030403B1
EP0030403B1 EP80201140A EP80201140A EP0030403B1 EP 0030403 B1 EP0030403 B1 EP 0030403B1 EP 80201140 A EP80201140 A EP 80201140A EP 80201140 A EP80201140 A EP 80201140A EP 0030403 B1 EP0030403 B1 EP 0030403B1
Authority
EP
European Patent Office
Prior art keywords
rotary kiln
bulk material
hot gases
inserted body
tube
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
Application number
EP80201140A
Other languages
German (de)
English (en)
Other versions
EP0030403A1 (fr
Inventor
Gerhard Dipl.-Ing. Krüger
Werner Dipl.-Ing. Kepplinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine AG
GEA Group AG
Original Assignee
Voestalpine AG
Metallgesellschaft AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voestalpine AG, Metallgesellschaft AG filed Critical Voestalpine AG
Priority to AT80201140T priority Critical patent/ATE4559T1/de
Publication of EP0030403A1 publication Critical patent/EP0030403A1/fr
Application granted granted Critical
Publication of EP0030403B1 publication Critical patent/EP0030403B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/028—Arrangements for the supply or exhaust of gaseous drying medium for direct heat transfer, e.g. perforated tubes, annular passages, burner arrangements, dust separation, combined direct and indirect heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/22—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration
    • F26B3/24—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration the movement being rotation
    • 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
    • F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
    • F27B7/16—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means
    • 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 peculiar to rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices

Definitions

  • the invention relates to a method for drying and calcining bulk materials in a rotary tube with countercurrent flow of hot gases, the drying and optionally precalcination taking place in direct contact with hot gases in the part of the rotary tube which adjoins the loading end, the calcination by indirect heat exchange over the length of a Insert body takes place in front of the discharge end of the rotary tube in the annular space formed between the inner wall of the rotary tube and the outer wall of the insert body and hot gases are conducted into the insert body and flow from the latter into the rotary tube.
  • a drying drum is known from DE-PS No. 261997, in which the hot gases and the material are conducted in cocurrent.
  • a heating tube with a smaller diameter and then a heating tube with a larger diameter are arranged in the rotary tube.
  • the material is charged into the annular space. Part of the hot gases is led into the annular space and the other part into the heating pipe.
  • the rotary tube is arranged in a fixed housing, and the exhaust gases are directed into this housing for heat utilization, flow through the housing in countercurrent and are directed into the chimney.
  • the rotary tube and the heating tube must be made of heat-resistant steel depending on the gas temperature, and the exhaust gas can cause the rotary tube to cool down.
  • An insert body is arranged in the rotary tube from the discharge end, into which hot gases are introduced and from which they flow into the rotary tube.
  • the insert body consists of an inner tube and a lining between the inner tube and the rotary tube. In this lining, channels are arranged in a star shape on the wall of the rotary tube, into which the material enters and from which the material is discharged at the discharge end of the rotary tube.
  • the channels have a very small diameter, the transport speed is low due to the small diameter, and the throughput is therefore also low. This is made worse by the fact that the channels are not round. A material jam forms at the inlet of the channels. Because of this material jam and the low throughput of the ducts, only a low bed height can be used in the rotary tube. As a result of the resulting high degree of filling in the channels and the resulting poor circulation, heat builds up and the risk of overheating and build-up occurs. The heat transfer from the heating gases to the material in the channels is poor and uneven.
  • the invention is based on the object of overheating in the calcining zone if possible to avoid little effort with certainty and to achieve good throughput.
  • the insert body is fastened to the rotary tube by means of lifting blades, the edge of each lifting blade located at the rear in the direction of rotation being connected to the rotary tube and not allowing material to fall through, each lifting blade being connected to the insert body by connecting pieces which do this Allow material falling from the lifting blades to trickle down on the outer wall of the insert body, and the shape of the lifting blades is selected so that the material falling from the front edge trickles down on both sides of the insert body in as equal amounts as possible.
  • the insert body is expediently designed as a central tube.
  • the lifting vanes arranged in the annular space formed between the insert body and the rotary tube take the material with them from below and let it trickle onto the outer wall of the insert body, so that it is moved in a spiral path through the annular space to the discharge.
  • the indirect heat exchange during calcination takes place largely on the surface of the insert body.
  • the inner wall of the rotary tube in the annular space can be lined fireproof.
  • Lifting vanes can be arranged in the drying and, if appropriate, precalcination zone.
  • the hot gases can 'Verbrennunwerden, but they can also in a preliminary combustion chamber are generated. Protective gases or reaction gases can also be passed through the annular space.
  • a preferred embodiment consists in that a partial flow of the exhaust gas of the rotary tube is returned to the insert body. This allows a reduction and regulation of the temperature of the combustion gases in a simple manner if no upstream combustion chamber is used. If the direct heating has to take place at a considerably lower temperature, a partial flow of the exhaust gas can also be passed into the first part of the insert body, as seen on the loading side, or up to the end of the insert body.
  • a preferred embodiment consists in that the heat transfer from the heating gases to the bulk material is increased during the indirect heat exchange in that the insert body is provided with ribs or pins on the inside.
  • a preferred embodiment consists in that the amount of heat transferred by the indirect heat exchange per material unit is regulated by regulating the degree of filling in the annular space. This enables simple and effective regulation of the heat transfer.
  • the rotary tube 1 has a refractory lining 2.
  • the insert body is arranged as a central tube 3. 1 and 2, the central tube 3 is connected via connecting pieces 4 and lifting blades 5 to an inner tube 6 which bears against the refractory lining 2.
  • the lifting blades 5 are connected to the inner tube 6 by their rear edges in the direction of rotation. 3, the rear edges of the lifting blades 5 are connected directly to the rotary tube 1.
  • the hot gases are generated by the burner 7, which flow through the central tube 3 into the drying and optionally precalcination zone and are passed via line 8 into a cyclone separator 9.
  • the fresh material and the return 11 from the cyclone 9 are charged via the loading device 10. 12 represents a blower.
  • a partly directly, partly indirectly heated rotary tube of a pilot plant was charged with 70 kg / h aluminum fluoride trihydrate with a free moisture content of 6%. After an average residence time of 29.6 minutes at an oven speed of 6.8 tr / min, 39.4 kg / h of calcined aluminum fluoride with an AIF 3 content of over 97% and an ignition loss of 0.3 to 0 left the product discharge , 4%.
  • the total length of the rotary tube was 5 m, of which 3.8 m were heated directly and 1.2 m indirectly.
  • the tubular steel jacket had a diameter of 650 mm and was lined with a high-alumina ramming compound. The free inside diameter was 430 mm. On the pro.
  • the end of the product discharge was a cylindrical inner tube made of steel with eight internal lifting blades, which in turn support the central tube made of heat-resistant stainless steel.
  • the outer diameter of the central pipe for indirect material heating was 300 mm.
  • the hot gas required for the heat treatment of the material was generated by burning 5.5 kg / h of heating oil.
  • the hot gas temperature amounted to. approx. 1200 ° C.
  • about 10% of the fuel quantity could be saved by flue gas recirculation to set the hot gas temperature.
  • the gas temperature was still 890 ° C and when leaving the furnace at the product inlet it was still 250 ° C.
  • entrained dust particles were separated from the gas stream and returned to the furnace with the feed material.
  • a fan was used to generate the required negative pressure in the system and led the exhaust gas to the atmosphere.
  • the advantages of the invention are that overheating of the material in the calcining. zone is avoided with simple means, the rotary tube can be made of normal steel, the slide-in body can be made thin-walled, since it is hardly subjected to static loads, which improves the heat transfer, extensive optimization of the heat transfer is possible, and the slide-in body can be easily replaced .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)

Claims (4)

1. Procédé de séchage et de calcination de produits en vrac au four rotatif, à contre-courant de gaz chauds, dans lequel on effectue le séchage et, le cas échéant, une précalcination au contact direct des gaz chauds dans la partie du four rotatif se raccordant à l'extrémité de chargement, et la calcination par échange de chaleur indirect, sur la longueur d'un corps intercalaire en amont de l'extrémité de déchargement du four rotatif, dans l'espace annulaire formé entre la paroi intérieure du four rotatif et la paroi extérieure d'un corps intercalaire, on envoie des gaz chauds dans le corps intercalaire et on les fait passer de celui-ci dans le four rotatif, caractérisé en ce que le corps intercalaire est fixé sur le four rotatif à l'aide de pales releveuses, l'arête se trouvant en arrière suivant le sens de rotation de chaque pale étant solidaire du four rotatif et ne permettant aucun passage de matière, chaque pale releveuse étant solidarisée au corps intercalaire par des pièces de liaison qui laissent ruisseler vers le bas, sur la paroi extérieure du corps intercalaire, la matière tombant des pales releveuses et la forme de celles-ci est telle que la matière tombant de l'arête antérieure ruisselle, en des quantités aussi égales que possible, des deux côtés du corps intercalaire.
2. Procédé suivant la revendication 1, caractérisé en ce qu'il consiste à retourner un courant partiel de gaz résiduaire du four rotatif au corps intercalaire.
3. Procédé suivant l'une des revendications 1 ou 2, caractérisé en ce qu'il consiste à augmenter le transfert de la chaleur des gaz chauds au produit en vrac, pendant l'échange de chaleur indirect, en ménageant des nervures ou des proéminences sur la face intérieure du corps intercalaire.
4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce qu'il consiste à régler la quantité de chaleur transmise par unité de matériel par l'échange de chaleur indirect en réglant le taux de chargement dans l'espace annulaire.
EP80201140A 1979-12-08 1980-12-02 Procédé de séchage et de calcination de matériaux en vrac Expired EP0030403B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80201140T ATE4559T1 (de) 1979-12-08 1980-12-02 Verfahren zum trocknen und kalzinieren von schuettguetern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792949479 DE2949479A1 (de) 1979-12-08 1979-12-08 Verfahren zum trocknen und kalzinieren von schuettguetern
DE2949479 1979-12-08

Publications (2)

Publication Number Publication Date
EP0030403A1 EP0030403A1 (fr) 1981-06-17
EP0030403B1 true EP0030403B1 (fr) 1983-08-31

Family

ID=6087957

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80201140A Expired EP0030403B1 (fr) 1979-12-08 1980-12-02 Procédé de séchage et de calcination de matériaux en vrac

Country Status (12)

Country Link
US (1) US4354826A (fr)
EP (1) EP0030403B1 (fr)
JP (1) JPS5697537A (fr)
AT (1) ATE4559T1 (fr)
AU (1) AU538257B2 (fr)
CA (1) CA1148354A (fr)
DE (2) DE2949479A1 (fr)
ES (1) ES8200234A1 (fr)
FI (1) FI803605L (fr)
IN (1) IN153275B (fr)
YU (1) YU284580A (fr)
ZA (1) ZA806527B (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT384100B (de) * 1981-01-27 1987-09-25 Voest Alpine Ag Drehrohrofen
FR2564332B1 (fr) * 1984-05-16 1989-10-27 Sofremi Malaxeur a axe horizontal
US4730564A (en) * 1987-06-08 1988-03-15 Abboud Harry I Multi-stage kiln
DE3815104A1 (de) * 1988-05-04 1989-11-09 Deutag Mischwerke Gmbh Drehofen zum trocknen und/oder mischen von rieselfaehigem material
DE69105535T2 (de) * 1990-01-30 1995-04-13 Cyclean Inc Trommeltrockner für die Wiederaufbereitung von aufgebrochenem Altasphalt.
US5188299A (en) * 1991-10-07 1993-02-23 Rap Process Machinery Corp. Apparatus and method for recycling asphalt materials
US5520342A (en) * 1993-02-17 1996-05-28 Hendrickson; Arthur N. Apparatus for recycling asphalt materials
DE59308110D1 (de) * 1993-05-18 1998-03-12 Ammann U Maschf Ag Verfahren zum Trocknen und/oder Erwärmen von rieselfähigem Material und Vorrichtung hierzu
US5616303A (en) * 1994-10-11 1997-04-01 Gas Research Institute Centrifugal bed reactor
DE10240249B3 (de) * 2002-08-31 2004-02-26 Enerco Bv Anlage zum Trocknen und Aufbereiten von rieselfähigem mineralischem Gut
US20070070801A1 (en) * 2005-09-23 2007-03-29 Cedarapids, Inc. Pre-combustion mix drum
US8220982B2 (en) 2008-07-22 2012-07-17 Terex Usa, Llc Energy efficient asphalt plant
FR2944344B1 (fr) * 2009-04-10 2013-12-27 Inst Francais Du Petrole Four tournant pour traitement thermique de materiaux solides
ATE536442T1 (de) 2009-07-09 2011-12-15 Ammann Italy S P A Trockentrommel für anlagen für die herstellung von bituminösem mischgut
DE102011005127A1 (de) * 2011-03-04 2012-09-06 Siemens Aktiengesellschaft Verfahren zur Entwässerung von Nitrat-Hydraten
KR101097289B1 (ko) 2011-06-28 2011-12-21 주식회사 백산금속 열이용 효과 및 원료손실이 개선된 로터리 킬른
CN104792154B (zh) * 2015-04-03 2017-01-25 石家庄新华能源环保科技股份有限公司 一种间壁式回转窑装置
CN114034162B (zh) * 2021-12-06 2022-10-04 江苏龙净科杰环保技术有限公司 一种新型回转窑工艺
DE102022202605B4 (de) * 2022-03-16 2024-01-11 Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies Gmbh Flammschutz-Vorrichtung und Trockentrommel mit einer derartigen Flammschutz-Vorrichtung

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE261997C (fr) *
FR445432A (fr) * 1912-06-26 1912-11-11 Societe D Etudes Speciales Et D Installations Indu Sécheur à air chaud
US1431037A (en) * 1919-09-18 1922-10-03 William E Prindle Drier
US1381026A (en) * 1920-05-25 1921-06-07 Snyder Willoughby Elwood Process of and apparatus for burning cements
CH114724A (de) * 1925-04-15 1926-04-16 H De Meijer Drehofen mit indirekter Heizung des zu heizenden Gutes.
US1987242A (en) * 1928-04-30 1935-01-08 Madsen Martin Rotary drier
FR700633A (fr) * 1929-08-13 1931-03-05 Eisenwerk Albert Gerlach Ges M Four tubulaire rotatif à moufle
US1959061A (en) * 1933-06-16 1934-05-15 Philip R Perkins Drier
US2319673A (en) * 1941-02-07 1943-05-18 Arnold Dryer Co Dehydrating apparatus
FR927063A (fr) * 1946-05-18 1947-10-20 A Valuy Sa Des Ets Perfectionnements aux fours tournants
DE1433860A1 (de) * 1962-04-18 1969-02-06 Miguel De Monterde Verfahren zur Herstellung von Gips in kontinuierlichem Arbeitsprozess,und rotierender Ofen zur Ausfuehrung dieses Verfahrens
US3678598A (en) * 1970-06-19 1972-07-25 Phillips Petroleum Co Dual-drum dryer
US4285773A (en) * 1977-08-27 1981-08-25 Alberta Oil Sands Technology And Research Authority Apparatus and process for recovery of hydrocarbon from inorganic host materials

Also Published As

Publication number Publication date
ES497477A0 (es) 1981-10-16
JPS5697537A (en) 1981-08-06
YU284580A (en) 1983-06-30
IN153275B (fr) 1984-06-23
FI803605L (fi) 1981-06-09
EP0030403A1 (fr) 1981-06-17
DE3064717D1 (en) 1983-10-06
ZA806527B (en) 1981-10-28
ES8200234A1 (es) 1981-10-16
CA1148354A (fr) 1983-06-21
DE2949479A1 (de) 1981-06-11
AU538257B2 (en) 1984-08-02
US4354826A (en) 1982-10-19
ATE4559T1 (de) 1983-09-15
AU6512480A (en) 1981-06-18

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