EP0327650A1 - Apparatus to clear the flame area in a rotary drum furnace using direct heating, and arrangement and construction of the shovels - Google Patents

Apparatus to clear the flame area in a rotary drum furnace using direct heating, and arrangement and construction of the shovels Download PDF

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Publication number
EP0327650A1
EP0327650A1 EP88101355A EP88101355A EP0327650A1 EP 0327650 A1 EP0327650 A1 EP 0327650A1 EP 88101355 A EP88101355 A EP 88101355A EP 88101355 A EP88101355 A EP 88101355A EP 0327650 A1 EP0327650 A1 EP 0327650A1
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EP
European Patent Office
Prior art keywords
lifting
rotary kiln
inner circumference
shovels
rotary drum
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Granted
Application number
EP88101355A
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German (de)
French (fr)
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EP0327650B1 (en
Inventor
Reinhold Höhn
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WIBAU MASCHINEN GMBH & CO. KG
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Wibau Maschinen & Co KG GmbH
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Priority to AT88101355T priority Critical patent/ATE93612T1/en
Priority to DE88101355T priority patent/DE3883516D1/en
Priority to EP88101355A priority patent/EP0327650B1/en
Publication of EP0327650A1 publication Critical patent/EP0327650A1/en
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    • 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
    • F27B7/161—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 the means comprising projections jutting out from the wall
    • F27B7/162—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 the means comprising projections jutting out from the wall the projections consisting of separate lifting elements, e.g. lifting shovels
    • 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
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
    • F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum

Definitions

  • the invention relates to a method for keeping the generally coaxial flame area of a directly fired cylindrical rotary kiln for drying and heating bulk materials, in particular grain-graded minerals or granules from minerals and bituminous binders, by means of an approximately trapezoidal shape, arranged in the direction of rotation, partially arranged
  • the inner circumference of the rotary kiln has open lifting blades, the edge of which forms scoop edges.
  • the invention relates to the arrangement and formation of lifting blades in a directly fired cylindrical rotary kiln in a uniform division over its inner circumference for the continuous drying and heating of bulk materials, in particular grain-graded minerals or granules from minerals and bituminous binders, which are approximately trapezoidal and partially in the direction of rotation Inner circumference of the rotary kiln are open, and the edge of which forms a scooping edge to keep a coaxially directed flame area free.
  • lifting vane internals simplex internals, cross internals and quadrant internals.
  • simplex internals simplex internals
  • cross internals quadrant internals.
  • lifting blades ie the simplest form of internals
  • the selected cross section of the lifting blades e.g. B.
  • the drum cross section is kept free of more or less controlled ejection of good particles, so that in this area of the drum there is a practically undisturbed flow of heating gas, which on the one hand allows the mineral goods to be brought together in a controlled manner and on the other hand enriches them of the gas flow with rock particles that have not yet been completely enveloped (see column 2, lines 39-55).
  • EP-A 81 1075 71.2, page 5 shows a diagram of the discharge behavior of the goods in a drum cross section equipped with angle profiles, which is to be regarded as the basis of the prior art. There is no serious change if the free legs of the angles are angled briefly in the direction of the drum wall as a "trapezoid".
  • the internals currently used essentially have trapezoids or trapezoidal shapes, the leg located in the direction of rotation of the drum not being connected to the wall, but rather leaving an inlet or outlet opening for the material to be heated.
  • the solution according to the invention for the method provides that the bulk material in the area of the fourth and first quadrants is picked up over the scooping edge of each lifting vane, while avoiding complete filling and reducing the inlet cross-section by a baffle which engages in it, and that in the case of others Rotation of the rotary kiln in the direction of the outlet opening tion of the lifting blades by the chicane, initially no emptying of the lifting blade contents takes place until the II. quadrant of the rotary kiln is reached, while approximately at the beginning of III.
  • Quadrants of the bulk material occur with a delay on the rear wall of the leading lifting vane, which is each provided with a groove-shaped indentation, which takes up the remaining volume of the previous lifting vane and prevents the spray grain development and in the further decline down to the fourth quadrant, approximately coaxially with the radius of the lifting vane boundary , emptied.
  • each lifting vane with its rear wall attached to the inner circumference of the drum wall, starting from the tangent to the fastening line, is angled 10-20 ° and pointing in the direction of rotation, 10-20 ° and about two Third of the remaining height is bent back at approximately the same angle, and the two mutually directed folding planes form a channel, that the rear wall is then angled by approximately 90 ° with a width of more than 50% based on its development length, in this case forming the base of the lifting blade, that the bottom is transferred into a further section which is angled upward by approximately 135 ° and which forms the scooping edge in its upper edge boundary, this being angled back to approximately 120 °, and that between the perpendicular to the line of attachment of the rear wall of the lifting vane to the rotary kiln and the perpendicular to the line of the scoop formed at a distance of about a third, measured from the scoop, a backward baffle reducing the passage cross-section for the bulk material
  • the formation of the lifting vane wall in the context of a uniform process which includes the rear wall with a channel or bulge, the adjoining floor, which leads into an upwardly angled section and which forms a scooping edge in its upper edge, slightly angled back, allows one rational prefabrication of these internals.
  • the outlet baffle is an isosceles or isosceles angular profile with its legs rising up the inner circumference, or has another suitable cross section.
  • the lifting vanes are, for example, staggered and delimited on both sides by cover plates, or that these are arranged in a row in each case with a cover plate that closes at the end.
  • the lifting blades can be adapted to the requirements of the process in a wide range.
  • the rotary kiln 1 is equipped over the area of its circumference and its functional length either with staggered lifting blades 3 or provided with lifting blades 3 arranged in a row and gap on a gap ( Figures 2 and 3).
  • the lifting blades 3 are closed at the end of the inclined rotary kiln 1 by a cover plate 1.1, while in the second case (FIG. 3) the lifting blades 3 are arranged in rows, each lifting blade 3 being closed at both ends by a cover plate 1.1 .
  • a baffle 4 reducing the filling volume of the lifting vanes 3 is arranged at an approximate distance of a third of the radian dimension of their circumferential extent 3.6, measured from the entry side backwards, which likewise retards the emptying speed of the bulk material 5 out of the lifting vanes 3.
  • the cross-section of the lifting blades 3 is due to the shape of the rear wall 3.1, consisting of the sections 3.11 and 3.12 forming the rearward open channel 3.2, the adjoining base 3.3, its angled section 3.4 and the delimiting region which forms the scooping edge 3.5 , certainly.
  • Quadrants of the rotary kiln 1 a discharge of the material 5 via the scooping edge 3.5 takes place to a limited extent parallel to the drum periphery, while approximately at the beginning of III.
  • Quadrant of the bulk material 5 occurs with a delay on the rear wall 3.1 of the leading lifting blade 3 and is initially received here by the groove-shaped indentation 3.2.
  • This leading lifting vane 3 thus takes up the remaining volume of the trailing lifting vane 3 in its trough-shaped indentation 3.2 and gives this in the further decline via the III. down to the fourth quadrant - roughly coaxial to the radius of the lift paddle boundary.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

The invention relates to a process to clear the coaxially running flame area of a directly fired rotary drum furnace (1) for drying and heating bulk material (5), in particular grain-graded mineral substances or granulates made of mineral substances and bituminous binders by means of shovels (3) which are arranged in the direction of rotation, are partially open to the inner circumference (2) of the rotary drum furnace (1) and the edge limits of which form scooping edges (3.5), as well as the design and arrangement of shovels (3) in a directly fired rotary drum furnace (1) with uniform separation over its inner circumference (2). Criteria of these inventions are a) the reduction of the degree of filling of the shovels (3), occurring at constant material feed, to a given filling volume which allows greater mobility of the material inside the shovels and thus promotes heat transmission by contact to the material; b) prevention of shovel emptying until quadrant II of the rotary drum furnace (1) is reached; c) the special design of the rear wall (3.1) of the respectively leading shovel (3) with an indentation forming a channel (3.2) which receives the discarded residual volume of the bulk material (5), avoiding development of spraying grain and d) the necessary free space for the development of the coaxially running flame area is produced. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Frei­haltung des in der Regel im wesentlichen koaxial verlaufenden Flammenbereiches eines direkt befeu­erten zylindrischen Drehrohrofens zur Trocknung und Erhitzung von Schüttgütern, insbesondere von korngestuften Mineralstoffen oder Granulaten aus Mineralstoffen und bituminösem Bindemittel mittels etwa trapezförmig ausgebildeten, in Drehrichtung angeordneten, partiell zum Innenumfang des Dreh­rohrofens offenen Hubschaufeln, deren Rand­begrenzungen Schöpfkanten bilden.
Des weiteren betrifft die Erfindung die Anord­nung undAusbildung von Hubschaufeln in einem di­rekt befeuerten zylindrischen Drehrohrofen in gleichmäßiger Teilung über dessen Innenumfang zur durchlaufenden Trocknung und Erhitzung von Schüttgütern, insbesondere von korngestuften Mineral­stoffen oder Granulaten aus Mineralstoffen und bituminösem Bindemittel, die etwa trapezförmig und in Drehrichtung partiell zum Innenumfang des Dreh­rohrofens offen sind, und deren Randbegrenzung eine Schöpfkante zur Freihaltung eines koaxial gerichte­ten Flammenbereiches bildet.The invention relates to a method for keeping the generally coaxial flame area of a directly fired cylindrical rotary kiln for drying and heating bulk materials, in particular grain-graded minerals or granules from minerals and bituminous binders, by means of an approximately trapezoidal shape, arranged in the direction of rotation, partially arranged The inner circumference of the rotary kiln has open lifting blades, the edge of which forms scoop edges.
Furthermore, the invention relates to the arrangement and formation of lifting blades in a directly fired cylindrical rotary kiln in a uniform division over its inner circumference for the continuous drying and heating of bulk materials, in particular grain-graded minerals or granules from minerals and bituminous binders, which are approximately trapezoidal and partially in the direction of rotation Inner circumference of the rotary kiln are open, and the edge of which forms a scooping edge to keep a coaxially directed flame area free.

In LUEGER, Gesamtlexikon der Technik, roro-Ausgabe 1972, Band 37, Seite 511, wird ausgeführt daß die Einbauten in Trockentrommeln den Zweck haben, das Gut zu durchmischen und in kleinen Teilmengen gleichmäßig über den TrommelquerschNitt zu vertei­len,
obwohl hier - im Gegensatz zu dieser Literatur­stelle⁻ die Freihaltung des Flammenbereiches von Rieselstoffen vorgesehen ist, dürfen diese Ausfüh­rungen eine grobe Klassifizierung der Einbauten erleichtern.In LUEGER, Gesamtlexikon der Technik, roro edition 1972, volume 37, page 511, it is stated that the installations in drying drums have the purpose of mixing the material and distributing it in small parts evenly over the drum cross-section,
Although here - in contrast to this literature reference⁻ the flame area is to be kept free of trickle materials, these explanations may facilitate a rough classification of the internals.

Nach der dort gegebenen Aussage wird zwischen Hub­schaufeleinbauten, Simplexeinbauten, Kreuzeinbauten und Quadranteneinbauten unterschieden. Hierbei sind von den in Reihenfolge ihrer Aufzählung aufwendiger werdenden Einbauten für die Gruppe der "grobkörnigen oder breiigen Stoffe" - in welche die zu verarbeiten­den Zuschlagstoffe bzw. das aufzubereitende Misch­gut einzuordnen sind - Hubschaufeln, d. h. die ein­fachste Einbautenform, vorrangig geeignet.
Der fallweise gewählte Querschnitt der Hubschau­feln, z. B. halbkreisförmige Rinnen, gleichschenk­lige oder ungleichschenklige, radial gerichtete 90°-Winkelprofile oder ebenso gerichtete, jedoch einen größeren Winkel als 90° aufweisende Profile - auch U-Profile deren Abwandlung als Trapezprofile ansprechbar sind kann von Fall zu Fall verschie­den sein.
Alle Hubschaufeleinbauten dieser Art weisen jedoch grundsätzlich die selbe Abwurfcharakteristik aus.According to the statement given there, a distinction is made between lifting vane internals, simplex internals, cross internals and quadrant internals. Of the internals, which become more complex in the order of their enumeration, for the group of "coarse-grained or pulpy materials" - in which the aggregates to be processed or the mix to be processed are to be classified - lifting blades, ie the simplest form of internals, are primarily suitable.
The selected cross section of the lifting blades, e.g. B. semicircular channels, isosceles or isosceles, radially directed 90 ° angle profiles or equally directed, but having a larger angle than 90 ° profiles - also U-profiles whose modification as trapezoidal profiles can be addressed may vary from case to case.
However, all lifting vane internals of this type basically have the same discharge characteristics.

Ausgehend von dem für jedes Schüttgut konstanten Böschungswinkel, und ausgehend von einer konstanten Um­fangsgeschwindigkeit kann lediglich das maximal mög­liche Füllvolumen zwischen zwei Folgeeinbauten und die Formgebung dieser Einbauten die Dichte der sich bildenden Abwurfkaskade geringfügig beeinflussen.
Eine solche Ausführung ist beispielsweise durch die DE-PS 26 17 839 bekannt.
Bei einem solchen Drehrohrofen sind im Einzugsbe­reich Schneckengänge parallel zum Trommelmantel verlaufend vorgesehen, die überdeckende Abgrenzungen aufweisen, während die später folgenden Einbauten etwa trapezförmig geformte Schaufeln, die, in Um­drehungsrichtung des Drehrohrofens betrachtet, eine relativ weite, über den I. Quadranten hinaus­greifende Anhebung des Gutes, und damit sowohl einen guten Wärmeübergang ermöglichen, als auch eine große Oberfläche für die Zugabe des disper­gierten Bindemittels darbieten.
Durch die die Einbauten verbindenden Profile des Vermengungsbereiches wird der Trommelquerschnitt von mehr oder weniger kontrolliert abgeworfenen Gutteilchen freigehalten, so daß in diesem Bereich der Trommel eine praktisch ungestörte Heizgasströ­mung gegeben ist, die einmal eine kontrollierte Zusammenführung des Mineralgutes mit dem Bindemit­tel zuläßt und zum anderen eine Anreicherung des Gasstromes mit noch nicht vollständig umhüllten Gesteinspartikeln verhindert (vgl. Spalte 2, Zeilen 39 - 55).On the basis of the slope angle that is constant for each bulk material and on the basis of a constant peripheral speed, only the maximum possible filling volume between two subsequent installations and the shape of these installations can have a slight influence on the density of the discharge cascade that is formed.
Such an embodiment is known for example from DE-PS 26 17 839.
In such a rotary kiln, screw flights are provided in the feed area running parallel to the drum casing, which have overlapping boundaries, while the later built-in fittings, which have an approximately trapezoidal shape and which, viewed in the direction of rotation of the rotary kiln, have a relatively wide increase in the material that extends beyond the first quadrant , and thus enable good heat transfer as well as a large surface area for the addition of the dispersed binder.
Due to the profiles of the mixing area connecting the internals, the drum cross section is kept free of more or less controlled ejection of good particles, so that in this area of the drum there is a practically undisturbed flow of heating gas, which on the one hand allows the mineral goods to be brought together in a controlled manner and on the other hand enriches them of the gas flow with rock particles that have not yet been completely enveloped (see column 2, lines 39-55).

Aus der EP-A 81 1075 71.2 , Seite 5, ist ein Diagremm über das Abwurfverhalten des Gutes in einem mit Winkelprofilen ausgerüsteten Trommelquerschnitt zu entnehmen, das als Basis desStandes der Technik zu betrachten ist.
Eine gravierende Änderung ergibt sich nicht, wenn die freien Schenkel der Winkel nochmals kurz in Richtung der Trommelwandung als "Trapez" abgewinkelt sind.EP-A 81 1075 71.2, page 5, shows a diagram of the discharge behavior of the goods in a drum cross section equipped with angle profiles, which is to be regarded as the basis of the prior art.
There is no serious change if the free legs of the angles are angled briefly in the direction of the drum wall as a "trapezoid".

Zusammengefaßt ist festzuhalten, daß die z. Zt. verwendeten Einbauten im wesentlichen Trapeze oder trapezähnliche Formen aufweisen, wobei der in Drehrichtung der Trommel vorne liegende Schenkel nicht mit der Wand verbunden ist, sondern vielmehr eine Ein- bzw. Auslauföffnung für das zu erhitzende Material freiläßt.In summary, it should be noted that the z. The internals currently used essentially have trapezoids or trapezoidal shapes, the leg located in the direction of rotation of the drum not being connected to the wall, but rather leaving an inlet or outlet opening for the material to be heated.

Bei diesen herkömmlichen Einbauten fällt ein kleiner Teil des Materials durch den Flammenbereich und verhindert den nach den Umweltbestimmungen erfor­derlichen Ausbrand der Flamme und belastet zusätz­lich den Abgasstrom durch mitgerissene Feinanteile aus dem Durchtrittsbereich.In these conventional installations, a small part of the material falls through the flame area and prevents the flame from being burned out in accordance with environmental regulations and also pollutes the exhaust gas flow with entrained fines from the passage area.

Dies berücksichtigend ist es Aufgabe der Erfindung, ein Verfahren zur Freihaltung des Flammenbereiches von durchfallendem Schüttgut in einem zylindrischen Drehrohrofen, sowie die Anordnung und Ausbildung von Hubschaufeln in einem direkt befeuerten, zylindrischen Drehrohrofen zur Freihaltung eines koaxial gerichte­ten Flammenbereiches zu konzipieren.Taking this into account, it is the object of the invention to design a method for keeping the flame area free from falling bulk material in a cylindrical rotary tube furnace, and the arrangement and design of lifting blades in a directly fired, cylindrical rotary tube furnace for keeping a coaxially directed flame area free.

Die erfindungsgemäße Lösung für das Verfahren sieht vor, daß das Schüttgut im Bereich des IV. und I. Qua­dranten über die Schöpfkante jeder Hubschaufel, bei Vermeidung einer vollständigen Füllung und Verringerung des Einlaufquerschnittes durch eine in diesen greifende Schikane, aufgenommen wird, und daß bei weiterer Drehung des Drehrohrofens in Richtung der Auslauföff­ nung der Hubschaufeln durch die Schikane zunächst keine Entleerung des Hubschaufelinhaltes bis zur Erreichung des II. Quadranten des Drehrohrofens stattfindet, während etwa zu Beginn des III.
Quadranten das Schüttgut verzögert auf die Rück­wand der vorlaufenden Hubschaufel auftritt, die jeweils mit einer rinnenförmigen Einbuchtung versehen ist, die das Restvolumen der zurückliegenden Hub­schaufel aufnimmt und die Spritzkornentwicklung un­terbindet und bei dem weiteren Niedergang bis in den IV. Quadranten, etwa koaxial zum Radius der Hub­chaufelbegrenzung, entleert.The solution according to the invention for the method provides that the bulk material in the area of the fourth and first quadrants is picked up over the scooping edge of each lifting vane, while avoiding complete filling and reducing the inlet cross-section by a baffle which engages in it, and that in the case of others Rotation of the rotary kiln in the direction of the outlet opening tion of the lifting blades by the chicane, initially no emptying of the lifting blade contents takes place until the II. quadrant of the rotary kiln is reached, while approximately at the beginning of III.
Quadrants of the bulk material occur with a delay on the rear wall of the leading lifting vane, which is each provided with a groove-shaped indentation, which takes up the remaining volume of the previous lifting vane and prevents the spray grain development and in the further decline down to the fourth quadrant, approximately coaxially with the radius of the lifting vane boundary , emptied.

Die jeweils durch die Schikane bedingte Einschrän­kung des Schüttgutfüllgrades der Hubschaufel gewähr­leistet bei gleichmäßiger Gutvorlage eine gleich­mäßige Gutaufnahme und damit eine vergrößerte Be­weglichkeit des Schüttgutes innerhalb der erhitz­ten Hubschaufel. In Verbindung damit ist eine Er­höhung der Wärmeübertragung durch Bewegung, und zwar durch den Austausch des Gutes mit den Berüh­rungsflächen der Hubschaufeln gegeben. Bis zur Er­reichung des II. Trommelquadranten findet zunächst keine Entleerung der Schaufeln - wenigstens nicht in erheblichem Umfang - statt und erst etwa mit Eintritt des Gutes in den III. Quadranten setzt der durch die vorgesehene Schikane verzögerte Aus­lauf ein, der durch die rinnenförmige Ausbuchtung der Rückwand der vorlaufenden Hubschaufel aufge­nommen wird, wobei, bedingt durch die Formgebung dieser Ausbuchtung die Spritzkornentwicklung unterbunden wird.The restriction of the degree of bulk filling of the lifting vane, which is caused by the chicane, ensures that the material is evenly picked up and that the bulk material within the heated lifting vane is more mobile. In connection with this, there is an increase in heat transfer by movement, namely by exchanging the material with the contact surfaces of the lifting blades. Until the second drum quadrant is reached, there is initially no emptying of the blades - at least not to a considerable extent - and only when the goods enter the III. Quadrants use the outlet delayed by the intended chicane, which is received by the trough-shaped bulge of the rear wall of the leading lifting blade, whereby, due to the shape this bulge prevents spray grain development.

Zur weiteren Erklärung wird unmittelbar auf die erfinderischen Merkmale verwiesen und festge­stellt, daß diese in Verbindung mit der Erläuterung verdeutlicht in vollem Umfang den Erfordernissen der gestellten Aufgabe gerecht wird.For a further explanation, reference is made directly to the inventive features and it is found that this clarifies in conjunction with the explanation fully meets the requirements of the task set.

Im weiteren wird auf die Anordnung und Ausbildung von Hubschaufeln nach der eingangs gegebenen Defi­nition eingegangen, wobei diese die Freihaltung eines koaxial gerichteten Flammenbereiches von durch­fallendem Schüttgut zum Ziele haben.Furthermore, the arrangement and design of lifting blades according to the definition given at the beginning is dealt with, the aim of which is to keep a coaxially directed flame region free from falling bulk material.

Die erfindungsgemäße Lösung dieser zweiten Aufgabe sieht vor, daß jede Hubschaufel mit ihrer an dem Innenumfang der Trommelwand befestigten Rückwand, ausgehend von der Tangente an die Befestigungslinie, etwa mit einem Drittel ihrer Höhe und in Drehrich­tung weisend, 10 - 20° abgewinkelt und über etwa zwei Drittel der Resthöhe in ungefähr gleichem Win­kel zurückgebogen ist, und die beiden zueinander gerichteten Knickebenen eine Rinne bilden,
daß die Rückwand anschließend um etwa 90° mit einer auf deren Abwicklungslänge bezogenen Breite von über 50 %, hierbei den Boden der Hubschaufel bildend, ab­gewinkelt ist,
daß der Boden in einen weiteren, um etwa 135° nach oben abgewinkelten Abschnitt überführt, der in sei­ner oberen Randbegrenzung die Schöpfkante bildet, wo­bei diese auf etwa 120° zurückgewinkelt ist, und daß das zwischen der senkrecht zur Befestigungs­linie der Rückwand der Hubschaufel am Drehrohr­ofen und dem senkrecht zur Linie der Schöpfkante gebildete Bogenmaß im Abstand ungefähr eines Drittels, gemessen von der Schöpfkante aus, nach rückwärts je­weils eine den Durchtrittsquerschnitt reduzierende Auslaufschikane für das Schüttgut angeordnet ist.The solution to this second problem according to the invention provides that each lifting vane with its rear wall attached to the inner circumference of the drum wall, starting from the tangent to the fastening line, is angled 10-20 ° and pointing in the direction of rotation, 10-20 ° and about two Third of the remaining height is bent back at approximately the same angle, and the two mutually directed folding planes form a channel,
that the rear wall is then angled by approximately 90 ° with a width of more than 50% based on its development length, in this case forming the base of the lifting blade,
that the bottom is transferred into a further section which is angled upward by approximately 135 ° and which forms the scooping edge in its upper edge boundary, this being angled back to approximately 120 °, and that between the perpendicular to the line of attachment of the rear wall of the lifting vane to the rotary kiln and the perpendicular to the line of the scoop formed at a distance of about a third, measured from the scoop, a backward baffle reducing the passage cross-section for the bulk material is arranged.

Die Ausbildung der Hubschaufelwandung im Rahmen einer einheitlichen Abwicklung, die die Rückwand mit einer Rinne bzw. Ausbuchtung, den anschließen­den Boden, der in einen nach oben abgewinkelten Ab­schnitt überführt und der in seiner oberen Randbe­grenzung,leicht zurückgewinkelt, eine Schöpfkante bildet, einschließt, gestattet eine rationelle Vor­fertigung dieser Einbauten.The formation of the lifting vane wall in the context of a uniform process, which includes the rear wall with a channel or bulge, the adjoining floor, which leads into an upwardly angled section and which forms a scooping edge in its upper edge, slightly angled back, allows one rational prefabrication of these internals.

Auf die Bedeutung der innerhalb der Hubschaufel­umgrenzung angeordneten Schikane wurde bereits bei Abhandlung des Verfahrens eingegangen, wobei diese Schikane beliebige Ausführungsformen aufweist. So kann es vorgesehen sein, daß die Auslaufschikane ein mit seinen Schenkeln dem Innenumfang aufstehendes gleich- oder ungleichschenkliges Winkelprofil ist, oder einen anderen geeigneten Querschnitt aufweist.The importance of the chicane arranged within the lifting vane boundary was already discussed when the method was dealt with, this chicane having any embodiment. Thus it can be provided that the outlet baffle is an isosceles or isosceles angular profile with its legs rising up the inner circumference, or has another suitable cross section.

Aus der Vielzahl der möglichen Hubschaufelanordnungen innerhalb des Drehrohrofens soll lediglich herausge­griffen werden, daß die Hubschaufeln beispielsweise versetzt gestuft angeordnet und beidseitig durch Ab­deckbleche abgegrenzt sind, oder daß diese in Reihe durchlaufend mit je einem endseitig abschließenden Abdeckblech versehen, angeordnet sind.From the multitude of possible lifting vane arrangements within the rotary kiln, it should only be pointed out that the lifting vanes are, for example, staggered and delimited on both sides by cover plates, or that these are arranged in a row in each case with a cover plate that closes at the end.

Selbstverständlich können die Hubschaufeln im weiten Rahmen den Anforderungen des Verfahrens angepaßt werden.Of course, the lifting blades can be adapted to the requirements of the process in a wide range.

Das erfindungsgemäße Verfahren, sowie die An­ordnung und Ausbildung der Hubschaufeln werden durch die beigefügten Zeichnungen beispielswei­se erläutert.

  • Figur 1 stellt einen partiellen Schnitt durch die Quadranten II und III eines rechtslaufend angetriebenen Drehrohr­ofens dar.
  • Die Figuren 2 und 3 zeigen aus der Vielzahl der Anord­nungsmöglichkeiten der Hubschaufeln im Drehrohrofen zwei Ausführungsbei­spiele.
The method according to the invention, as well as the arrangement and design of the lifting blades are explained for example by the accompanying drawings.
  • Figure 1 shows a partial section through the quadrants II and III of a right-handed rotary kiln.
  • FIGS. 2 and 3 show two exemplary embodiments from the large number of possible arrangements of the lifting blades in the rotary kiln.

Der Drehrohrofen 1 ist über den Bereich seines Um­fanges und seiner Funktionslänge entweder mit ver­setzt gestuft angeordneten Hubschaufeln 3 ausgerü­stet oder aber mit in Reihe und Lücke auf Lücke an­geordneten Hubschaufeln 3 versehen (Figur 2 und 3).The rotary kiln 1 is equipped over the area of its circumference and its functional length either with staggered lifting blades 3 or provided with lifting blades 3 arranged in a row and gap on a gap (Figures 2 and 3).

Im ersten Fall (Figur 2) sind die Hubschaufeln 3 am Ende des geneigten Drehrohrofens 1 durch ein Abdeckblech 1.1 abgeschlossen, während im zweiten Fall (Figur 3) die Hubschaufeln 3 in Reihen ange­ordnet sind, wobei jede Hubschaufel 3 beidends durch ein Abdeckblech 1.1 abgeschlossen ist.In the first case (FIG. 2), the lifting blades 3 are closed at the end of the inclined rotary kiln 1 by a cover plate 1.1, while in the second case (FIG. 3) the lifting blades 3 are arranged in rows, each lifting blade 3 being closed at both ends by a cover plate 1.1 .

In den Hubschaufeln 3 ist im ungefähren Abstand eines Drittels des Bogenmaßes ihrer Umfangser­streckung 3.6, gemessen von der Eintrittsseite nach rückwärts, jeweils eine das Füllvolumen der Hubschaufeln 3 reduzierende Schikane 4 angeordnet, die gleichfalls die Entleerungsgeschwindigkeit des Schüttgutes 5 aus den Hubschaufeln 3 heraus verzögern.In the lifting vanes 3, a baffle 4 reducing the filling volume of the lifting vanes 3 is arranged at an approximate distance of a third of the radian dimension of their circumferential extent 3.6, measured from the entry side backwards, which likewise retards the emptying speed of the bulk material 5 out of the lifting vanes 3.

Der Querschnitt der Hubschaufeln 3 wird durch die Formgebung der Rückwand 3.1, bestehend aus der nach rückwärts offenen Rinne 3.2 bildenden Abschnitten 3.11 und 3.12, dem daran anschließenden Boden 3.3, dessen abgewinkelten Abschnitt 3.4 und dem in seinem etwas zurückgewinkelten Begrenzungsbereich, der die Schöpfkante 3.5 bildet, bestimmt.The cross-section of the lifting blades 3 is due to the shape of the rear wall 3.1, consisting of the sections 3.11 and 3.12 forming the rearward open channel 3.2, the adjoining base 3.3, its angled section 3.4 and the delimiting region which forms the scooping edge 3.5 , certainly.

Ab II. Quadranten des Drehrohrofens 1 findet in eingeschränktem Umfang ein parallel zur Trommel­peripherie stattfindender Austritt des Gutes 5 über die Schöpfkante 3.5 statt, während etwa zu Beginn des III. Quadranten das Schüttgut 5 verzögert auf die Rückwand 3.1 der vorlaufenden Hubschaufel 3 auftritt und hier zunächst durch die rinnenförmige Einbuchtung 3.2 aufgenommen wird. Diese vorlaufende Hubschaufel 3 nimmt also das Restvolumen der nach­laufenden Hubschaufel 3 in ihrer rinnenförmigen Ein­buchtung 3.2 auf und gibt dieses beim weiteren Niedergang über den III. bis in den IV. Quadranten hinein - etwa koaxial zum Radius der Hubschaufeln­begrenzung - ab.From II. Quadrants of the rotary kiln 1, a discharge of the material 5 via the scooping edge 3.5 takes place to a limited extent parallel to the drum periphery, while approximately at the beginning of III. Quadrant of the bulk material 5 occurs with a delay on the rear wall 3.1 of the leading lifting blade 3 and is initially received here by the groove-shaped indentation 3.2. This leading lifting vane 3 thus takes up the remaining volume of the trailing lifting vane 3 in its trough-shaped indentation 3.2 and gives this in the further decline via the III. down to the fourth quadrant - roughly coaxial to the radius of the lift paddle boundary.

Dadurch wird die Freihaltung des im wesentlichen koaxial gerichteten Flammenbereiches von durch die Flamme fallendem Korn gesichert, so daß dieses nicht durch die Abgase ausgetragen wird.This ensures that the essentially coaxially directed flame region is kept free from grain falling through the flame, so that it is not carried away by the exhaust gases.

Desgleichen wird eine thermische Überbeanspruchung der Granulate verhindert.Thermal overload of the granules is also prevented.

Claims (4)

1. Verfahren zur Freihaltung des in der Regel im wesentlichen koaxial verlaufenden Flammen­bereiches eines direkt befeuerten zylindrischen Drehrohrofens (1) zur Trocknung und Erhitzung von Schüttgütern (5), insbesondere von korn­gestuften Mineralstoffen oder Granulaten aus Mineralstoffen und bituminösem Bindemittel mittels etwa trapezförmig ausgebildeten, in Drehrichtung angeordneten, partiell zum Innen­umfang (2) des Drehrohrofens (10) offenen Hubschaufeln (3), deren Randbegrenzungen Schöpfkanten (3.5) bilden, dadurch gekennzeich­net,
daß das Schüttgut (5) im Bereich des IV. und I. Quadranten über die Schöpfkante (3.5) jeder Hubschaufel (3), bei Vermeidung einer vollständigen Füllung und Verringerung des Einlaufquerschnittes durch eine in diesen grei­fende Schikane (4), aufgenommen wird,
daß bei weiterer Drehung des Drehrohrofens (1) in Richtung der Auslauföffnung der Hubschau­feln (3) durch die Schikane (40) zunächst keine Entleerung des Hubschaufelinhaltes bis zur Er­reichung des II. Quadranten des Drehrohrofens (1) stattfindet, während etwa zu Beginn des III. Quadranten das Schüttgut (5) verzögert auf die Rückwand (3.1) der vorlaufenden Hub­schaufel (3) auftritt, die jeweils mit einer rinnenförmigen Einbuchtung (3.2) versehen ist, die das Restvolumen der zurückliegenden Hubschaufel (30) aufnimmt und die Spritzkorn­entwicklung unterbindet und bei dem weiteren Niedergang bis in den IV. Quadranten, etwa koaxial zum Radius der Hubschaufelbegrenzung, entleert.1. Method for keeping the generally coaxial flame area of a directly fired cylindrical rotary kiln (1) for drying and heating bulk materials (5), in particular grain-graded minerals or granules from minerals and bituminous binders, by means of an approximately trapezoidal shape, in the direction of rotation arranged, partially to the inner circumference (2) of the rotary kiln (10) open lifting blades (3), the edge boundaries of which form scooping edges (3.5), characterized in that
that the bulk material (5) in the area of the IV. and I. quadrants is picked up over the scooping edge (3.5) of each lifting vane (3), while avoiding complete filling and reduction of the inlet cross-section by a baffle (4) engaging in it,
that when the rotary kiln (1) rotates further in the direction of the outlet opening of the lifting blades (3) through the chicane (40), the contents of the lifting blade are not initially emptied until the II. quadrant of the rotary kiln (1) is reached takes place while around the beginning of III. Quadrant of the bulk material (5) occurs with a delay on the rear wall (3.1) of the leading lifting vane (3), which is each provided with a groove-shaped indentation (3.2), which takes up the remaining volume of the rear lifting vane (30) and prevents the spray grain from developing and at the same time further decline to the fourth quadrant, roughly coaxial with the radius of the lifting vane boundary, emptied. 2. Anordnung und Ausbildung von Hubschaufeln (3) in einem direkt befeuerten zylindrischen Dreh­rohrofen (1) in gleichmäßiger Teilung über dessen Innenumfang (2) zur durchlaufenden Trocknung und Erhitzung von Schüttgütern (5), insbesondere von korngestuften Mineralstoffen oder Granulaten aus Mineralstoffen und bitumi­nösem Bindemittel, die etwa trapezförmig und in Drehrichtung partiell zum Innenumfang (2) des Drehrohrofens (1) offen sind, und deren Randbegrenzung eine Schöpfkante (3.5) zur Frei­haltung eines koaxial gerichteten Flammenberei­ches bildet, dadurch gekennzeichnet,
daß jede Hubschaufel (3) mit ihrer an dem Innenumfang (2) der Trommelwand befestigten Rückwand (3.1), ausgehend von der Tangente an die Befestigungslinie,
etwa mit einem Drittel ihrer Höhe (3.11) und in Drehrichtung weisend, 10 - 20° abgewinkelt und über etwa zwei Drittel der Resthöhe (3.12) in ungefähr gleichem Winkel zurückgebogen ist, und die beiden zueinander gerichteten Knick­ebenen eine Rinne (3.2) bilden,
daß die Rückwand (3.1) anschließend um etwa 90° mit einer auf deren Abwicklungslänge bezogenen Breite von über 50 %, hierbei den Boden (3.3) der Hubschaufel (30) bildend, abge­winkelt ist,
daß der Boden (3.3) in einen weiteren, um etwa 135° nach oben abgewinkelten Abschnitt (3.4) überführt, der in seiner oberen Randbegrenzung die Schöpfkante (3.5) bildet, wobei diese auf etwa 120° zurückgewinkelt ist, und
daß das zwischen der senkrecht zur Befesti­gungslinie der Rückwand (3.1) der Hubschaufel (3) am Drehrohrofen (1) und dem senkrecht zur Linie der Schöpfkante (3.5) gebildeten Bogenmaß (3.6) im Abstand ungefähr eines Drittels, gemessen von der Schöpfkante (3.5) aus, nach rückwärts je­weils eine den Durchtrittsquerschnitt reduzieren­de Auslaufschikane (4) für das Schüttgut (5) an­geordnet ist.2. Arrangement and formation of lifting blades (3) in a directly fired cylindrical rotary kiln (1) in uniform division over its inner circumference (2) for continuous drying and heating of bulk materials (5), in particular grain-graded minerals or granules from minerals and bituminous binders , which are approximately trapezoidal and partially open in the direction of rotation to the inner circumference (2) of the rotary kiln (1), and the edge of which forms a scooping edge (3.5) to keep a coaxially directed flame area free, characterized in that
that each lifting vane (3) with its rear wall (3.1) attached to the inner circumference (2) of the drum wall, starting from the tangent to the fastening line,
about one third of their height (3.11) and pointing in the direction of rotation, angled 10 - 20 ° and bent back at about the same angle over about two thirds of the remaining height (3.12), and the two kink levels facing each other form a groove (3.2),
that the rear wall (3.1) is then angled by approximately 90 ° with a width of more than 50% based on its development length, here forming the base (3.3) of the lifting blade (30),
that the bottom (3.3) is transferred into a further section (3.4) which is angled upwards by approximately 135 ° and which forms the scooping edge (3.5) in its upper edge boundary, this being angled back to approximately 120 °, and
that between the perpendicular to the fastening line of the rear wall (3.1) of the lifting vane (3) on the rotary kiln (1) and the radian measure (3.6) perpendicular to the line of the scooping edge (3.5) at a distance of about a third, measured from the scooping edge (3.5) outward, a discharge baffle (4) for the bulk material (5) that reduces the passage cross section is arranged to the rear. 3. Anordnung und Ausbildung von Hubschaufeln nach Anspruch 2, dadurch gekennzeichnet,
daß die Auslaufschikane (4) ein mit sei­nen Schenkeln dem Innenumfang (2) aufstehendes, gleichschenkliges Winkelprofil ist, oder einen anderen geeigneten Querschnitt aufweist.3. Arrangement and design of lifting blades according to claim 2, characterized in
that the outlet baffle (4) is an isosceles angular profile with its legs standing up on the inner circumference (2), or has another suitable cross section. 4. Anordnung und Ausbildung von Hubschaufeln nach Anspruch 2, dadurch gekennzeichnet,
daß die Hubschaufeln (3) versetzt gestuft angeordnet und beidseitig durch Abdeckbleche (1.1) abgegrenzt sind, oder daß diese in Reihe durch­laufend mit je einem endseitig abschließenden Abdeckblech (1.1) versehen, angeordnet sind.4. Arrangement and design of lifting blades according to claim 2, characterized in
that the lifting blades (3) are staggered and delimited on both sides by cover plates (1.1), or that these are arranged continuously in series with a cover plate (1.1) that closes at the end.
EP88101355A 1988-01-30 1988-01-30 Apparatus to clear the flame area in a rotary drum furnace using direct heating, and arrangement and construction of the shovels Expired - Lifetime EP0327650B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT88101355T ATE93612T1 (en) 1988-01-30 1988-01-30 DEVICE FOR KEEPING THE FIRE AREA OF A DIRECTLY FIRED ROTARY FURNACE CLEAR, AS WELL AS THE ARRANGEMENT AND DESIGN OF LIFTING SHOVELS.
DE88101355T DE3883516D1 (en) 1988-01-30 1988-01-30 Device for keeping the flame area of a directly fired rotary kiln as well as the arrangement and design of lifting blades.
EP88101355A EP0327650B1 (en) 1988-01-30 1988-01-30 Apparatus to clear the flame area in a rotary drum furnace using direct heating, and arrangement and construction of the shovels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88101355A EP0327650B1 (en) 1988-01-30 1988-01-30 Apparatus to clear the flame area in a rotary drum furnace using direct heating, and arrangement and construction of the shovels

Publications (2)

Publication Number Publication Date
EP0327650A1 true EP0327650A1 (en) 1989-08-16
EP0327650B1 EP0327650B1 (en) 1993-08-25

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EP (1) EP0327650B1 (en)
AT (1) ATE93612T1 (en)
DE (1) DE3883516D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120011736A1 (en) * 2010-07-14 2012-01-19 The Gsi Group, L.L.C. Grain turner for tower grain dryer and method of drying

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1670269A (en) * 1927-08-02 1928-05-15 American Miag Corp Cooling and drying apparatus and process of cement making adapted to be carried on thereby
BE858730A (en) * 1977-09-15 1978-01-02 Obourg Sa Ciments METHOD AND DEVICE FOR INCREASING THE CALORIFIC EXCHANGES BETWEEN SOLID MATERIAL AND GAS, IN A ROTARY CEMENT OVEN
US4189300A (en) * 1978-08-28 1980-02-19 Mechtron International Corporation Rotating drum dryer apparatus
EP0032468A2 (en) * 1980-01-11 1981-07-22 Creusot-Loire Apparatus for producing bituminous mixtures from aggregates, bitumen and solid materials liable to deteriorate at high temperature

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1670269A (en) * 1927-08-02 1928-05-15 American Miag Corp Cooling and drying apparatus and process of cement making adapted to be carried on thereby
BE858730A (en) * 1977-09-15 1978-01-02 Obourg Sa Ciments METHOD AND DEVICE FOR INCREASING THE CALORIFIC EXCHANGES BETWEEN SOLID MATERIAL AND GAS, IN A ROTARY CEMENT OVEN
US4189300A (en) * 1978-08-28 1980-02-19 Mechtron International Corporation Rotating drum dryer apparatus
EP0032468A2 (en) * 1980-01-11 1981-07-22 Creusot-Loire Apparatus for producing bituminous mixtures from aggregates, bitumen and solid materials liable to deteriorate at high temperature

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120011736A1 (en) * 2010-07-14 2012-01-19 The Gsi Group, L.L.C. Grain turner for tower grain dryer and method of drying
US8601714B2 (en) * 2010-07-14 2013-12-10 The Gsi Group, Llc Grain turner for tower grain dryer and method of drying

Also Published As

Publication number Publication date
DE3883516D1 (en) 1993-09-30
ATE93612T1 (en) 1993-09-15
EP0327650B1 (en) 1993-08-25

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