EP0015349B1 - Verbindungsvorrichtung zwischen einem Drehrohrofen und Satellitenkühlrohren - Google Patents

Verbindungsvorrichtung zwischen einem Drehrohrofen und Satellitenkühlrohren Download PDF

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Publication number
EP0015349B1
EP0015349B1 EP19790400153 EP79400153A EP0015349B1 EP 0015349 B1 EP0015349 B1 EP 0015349B1 EP 19790400153 EP19790400153 EP 19790400153 EP 79400153 A EP79400153 A EP 79400153A EP 0015349 B1 EP0015349 B1 EP 0015349B1
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EP
European Patent Office
Prior art keywords
tube
wall
axis
furnace
joining device
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Expired
Application number
EP19790400153
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English (en)
French (fr)
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EP0015349A1 (de
Inventor
Daniel Dementhon
Jacques Bonin
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CLE
Original Assignee
CLE
Creusot Loire Enterprises SA
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Application filed by CLE, Creusot Loire Enterprises SA filed Critical CLE
Priority to EP19790400153 priority Critical patent/EP0015349B1/de
Priority to DE7979400153T priority patent/DE2966242D1/de
Publication of EP0015349A1 publication Critical patent/EP0015349A1/de
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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
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/40—Planetary coolers

Definitions

  • the invention relates to a junction device between an inclined rotary oven for baking a material and a plurality of cooling tubes.
  • rotary kilns of large diameter are generally used which are rotated about their axis, the latter being inclined from upstream to downstream.
  • it is useful to cool the clinker and cooling tubes are often used for this, which are arranged in satellites around the oven downstream of it, each tube being connected at its upstream end with the inside the oven by a connecting duct.
  • the wall of the furnace is therefore provided with a plurality of material outlet orifices through which the latter falls into the connecting conduits, these generally having a direction substantially radial to the furnace.
  • the connecting duct opens into the cooling tube above a junction elbow which can be formed in different ways.
  • the connecting duct passes radially through the wall of the cooling tube and opens out above an inclined wall, of conical shape, which forms the upstream end of the tube and constitutes the junction elbow.
  • the material passing through the connecting duct falls on the inclined closure wall then descends downstream inside the cooling tube during the rotation of the latter around the axis of the furnace and it is cooled there. by air sucked into the inlet of the cooling tube and passing through the connecting pipe in the furnace where it is used for combustion.
  • the material dropped into each tube thus forms inside a slope which slowly advances from upstream to downstream in the direction of inclination of the furnace and it is necessary to avoid that the material is liable to fall back into the furnace when the tube passes over the axis of the furnace. It is therefore useful to arrange the junction elbow so that the material is quickly guided far enough from the outlet orifice of the connecting duct so as to reduce the risk of falling back into the oven. However, you should also not excessively lengthen the length of the elbow.
  • the connecting pipe is tangentially connected to the cooling tube.
  • the upstream end of the latter is closed by a wall which transversely cuts the cylindrical wall of the tube along an intersection edge which winds helically around the axis of the tube.
  • the material passing through the connecting pipe therefore pours onto the cylindrical wall of the tube, accumulates at the lowest point and is then pushed downstream by the closure wall during the rotation of the tube around the axis. from the oven.
  • the end of the connecting duct is fixed to a flat wall parallel to the axis of the cooling tube and the closure wall comprises, in the discharge area, a perpendicular flat surface to the axis of the tube and extended by a series of conical surfaces oriented so as to push the material downstream.
  • the set has a fairly complicated shape and difficult to achieve.
  • the closure wall of the end of the tube consists of a conical surface whose apex is placed substantially at the point of tangency between the tube and the connecting conduit and which is crossed by this, which requires an additional bent connection between the connecting duct and the closure wall, which complicates the production.
  • the material falling into the connecting pipe is therefore poured onto an inclined wall, either the closing wall or the cylindrical wall of the tube, on which it slides to accumulate at the lowest point of the tube and from there, go downstream.
  • the refractory lining therefore risks being subjected to very rapid wear and / or sticking of material in the discharge zone struck by the hot product falling through the connecting pipe.
  • the subject of the invention is a junction device also intended to cause rapid advancement downstream of the material dropped by the connecting duct, but which has the advantage of being subject to less wear and of being simpler. to realize that the known devices.
  • the closure wall has the shape of a portion of cylinder of revolution whose generatrices are parallel to the tangent to the upstream part of the contour of the outlet orifice of the connecting conduit at point I of tangency of the duct and the cooling tube so that the helical intersection edge coincides, over a certain distance, with said upstream part of the outlet orifice and that, in the discharge zone, the closure wall forms with the wall of the tube a chute whose bottom consists of the helical edge and in which the material accumulates.
  • Figure 1 is a cross-sectional view of the oven surrounded by its satellite tubes.
  • Figure 2 is a top view, the upper part of the oven being removed.
  • Figure 3 is a side view of the junction elbow.
  • FIG. 4 is a view of the cooling tube and of the connection duct in cross section according to IV-IV, FIG. 3.
  • Figures 5 to 11 show various positions of the junction elbow during rotation about the axis, to the right in side view and to the left in cross section.
  • Figures 1 and 2 schematically represent the part of the rotary kiln where the material is poured into the cooling tubes.
  • the cylindrical furnace 1 which is driven around an axis 10 inclined downstream relative to the horizontal is surrounded by a plurality of tubes 2 arranged in satellites around it and driven rotating with him.
  • Each tube 2 is on the other hand connected with the interior of the furnace by a connecting conduit 3.
  • Each connecting conduit opens into the furnace through an inlet orifice for the material 31 and into the corresponding tube through an outlet orifice 32.
  • the material 4 forms inside an embankment whose inclination depends on the particle size of the material and the circulation conditions in the oven and, generally, is of the order 30 ° from the horizontal.
  • the importance of the slope obviously depends on the quantity of material introduced into the oven and its speed of circulation and it can be considered that the lower edge of the slope is in the vicinity of the lower generatrix of the oven.
  • the material falls successively into the orifices 31 during their rotation and observation shows that the beginning of the fall occurs when the axis 30 of the orifice has exceeded by about 30 ° the vertical plane passing through the axis of the furnace, that is to say in the position marked G in FIG. 1.
  • each connecting duct 3 opens into the furnace in a radial direction.
  • the duct then consists, as shown in the figure, of a first element 33 whose axis 30 intersects the axis 10 of the furnace, and of a second element 34 whose axis 35 forms with l axis 30 an angle which, generally, will be between 20 and 40 °.
  • the beginning of the fall of the clinker occurs substantially at the moment when the upper edge 310 of the inlet orifice 31 passes directly over the lower edge 320 of the outlet orifice 32.
  • the second element 34 is tangentially connected to the tube 2; the material falls into the tube practically without touching the walls of the element 34 of the connecting duct 3.
  • the conduit 3 is connected to the tube 2 by a junction elbow 5 consisting of a wall which serves at the same time to close the end of the tube and to guide the material falling through the orifice 32 so that it spreads well in the tube 2.
  • a junction elbow 5 consisting of a wall which serves at the same time to close the end of the tube and to guide the material falling through the orifice 32 so that it spreads well in the tube 2.
  • USP 3,792,961 for example, it consists of a wall of conical shape on which the material is spread. However, as it falls from a fairly large height, the fall zone may wear out fairly quickly.
  • One of the characteristics of the present invention resides in the fact that the clinker falls into a sort of chute having a V section. It follows that the material falls on inclined walls and is less likely to wear them all the more that the thickness of the refractory is greater.
  • the material does not fall suddenly in the orifice 31, the material flow increasing and then gradually decreasing. Consequently, when the fall begins, at a low flow rate, the material can accumulate in the bottom of the V-shaped chute and thus form a mattress which protects the wall at the moment when the fall flow rate is maximum.
  • FIGS. 5 to 11 various positions have been shown of a cooling tube driven in rotation about the axis 10 of the furnace and which bear the references G, A, B, C, D, E, F in the figure. 1.
  • Each position can be identified as a function of the angle of rotation of the axis 30 from an origin position which, in FIG. 1, corresponds to position A for which the axis 30 of the first element of the conduit link 3 is horizontal, the position C therefore corresponding to a rotation of about 300 °.
  • junction elbow 5 must therefore promote the advancement in the tube 2 of the material fallen during the feeding phase to a distance from the orifice 31 such that the material is not likely to return to this orifice as long as the tube did not pass through position D.
  • this effect is obtained by giving the V-shaped chute into which the material is poured, a helical shape winding around the tube over at least a quarter of a turn.
  • Figures 3 and 4 show that such condi tions can be obtained when the elbow 5 is formed of a cylindrical wall whose axis and diameter are chosen judiciously.
  • FIGS. 3 and 4 there is partially shown the furnace 1 and the upstream end of a tube 2 being substantially in position F of FIG. 1.
  • the connecting duct 3 is formed of two elements 33 and 34 opening respectively into the furnace 1 and into the tube 2, through the inlet orifice 31 and through the outlet orifice 32.
  • the element 34 and the tube 2 have a common tangent plane P ( Figure 4) which is defined by the generator xx 'of the tube 2 (fig. 3) and by the generator yy' of the conduit 34, the two generators intersecting at a point I.
  • the guide wall 5 will be chosen so that its intersection with the tube 2 coincides over a certain distance, with the upstream part of the outline of the orifice 32 in the area material spill.
  • the generatrices of the cylindrical wall 5 will be substantially parallel to the tangent at point 1 at the contour of the orifice 32 and the axis 50 of the cylindrical wall 5 will be placed substantially in the common tangent plane P so that that it cuts the generator xx 'in O.
  • cylindrical wall 5 will have a diameter between 2 and 3 times that of the tube 2.
  • the wall 5 has a slightly larger diameter double that of tube 2, as can be seen in FIG. 4 where the ellipse corresponding to the section of wall 5 has been extended in dashed lines by the plane perpendicular to the axis of tube 2 and passing through point I.
  • the wall 5 intersects the tube 2 along a line 51 of which the development 510 along the plane P has been shown in dashed lines in FIG. 3. It can be seen that, from point 1 to the most distant point K towards the downstream on the tube 2, the line 510 corresponding to the development of the intersection curve 51 is practically straight, which clearly shows that the curve 51 forms on the tube 2 a helix between 1 and K, that is to say practically on a U-turn.
  • Figure 5 shows the tube during the pouring of the material.
  • the left part is a section along AA of the right part, that is to say by a plane passing through point I.
  • the wall 5 is cut along AA along a portion of ellipse 52 and along BB along an ellipse 53 indicated by dotted lines in the figures.
  • the chute 54 causes its movement of the screw to advance the material downstream at a speed greater than that which corresponds to the advance due solely to the inclination of the axis of the tube.
  • the wall 5 tilts down, which promotes the discharge of the material contained in the chute.
  • the effect of the helical chute (54) occurs up to position B shown in Figure 7, the material having accumulated at the end of the chute, at a distance from the center of the supply duct (34 ) which depends on the characteristics of the cylindrical wall 5.
  • the tube 2 continues to rotate and the material accumulated at the foot of the chute 54 and entrained by the movement of the tube, tends to rise upwards, then to pour out, according to the conventional advancement process in an inclined rotary tube.
  • the wall 5 tends to become more and more vertical, which increases, in this part the discharge of the material which thus remains accumulated near the downstream end K of the chute (54).
  • position D which corresponds to the maximum risk presented for the return of the material in the furnace, the latter is kept sufficiently spaced from the orifice 31.
  • the dam 6 is formed of a metal support consisting of a tube 60 of rectangular section on which is mounted a refractory wall.
  • the tube 60 opens at its two ends through the wall 5 and the cylindrical wall of the cooler 2. The cooling is thus ensured by the chimney effect created by the convection in the tube 60.
  • the dam has maximum efficiency in the event of a large filling of the cooling tube, its upper edge is oriented so as to be parallel to the embankment of material when the latter comes into contact with the barrier, that is to say before position D shown in FIG. 9.
  • the dam will preferably be inclined from 20 to 40 ° relative to a plane perpendicular to the axis 20 of the cooling tube 2. This increases the effect of distance of the material from the orifice 32. (However, to simplify the drawing, the barrier has been shown perpendicular to the axis 20 in Figures 5 to 11).
  • Line 41 shows in dotted lines in Figures 9, 10, 11, the possible shape of the slope for maximum filling.
  • the dam can begin to produce its effect from position B ( Figure 7) from which the slope of material may go upstream. The material thus tends to accumulate against the dam and, from position D (figure 9) for which there is no longer any danger of the clinker falling in the oven, the dam ceases to produce its effect and let the material gradually flow back to the orifice.
  • the shape of the wall 5 promotes the accumulation of material at the beginning of the helical chute 54 so that it can form near point 1 a bed of material which favors the damping of the fall of the clinker at position C.
  • the connecting elbow according to the invention has another original and interesting characteristic. Indeed, the connecting conduit does not have a constant section.
  • the second element 34 which is tangent at point 1 to the cooling tube 2 has a circular cross section and it connects to the first element 33 along a plane perpendicular to its axis.
  • the first element 33 has an elliptical section and the circular cross section of the element 34 is approximately 30% greater than the elliptical section of the first element 33.
  • the air sucked into the furnace and passing through the connecting duct 3 against the material gradually increases in speed.
  • the reduction in the speed of the air at the inlet 32 of the connecting duct and the improvement in aerodynamic conditions contribute to reducing the abrasive effect of the charge of the dust entrained in the furnace with the cooling air.

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

Claims (9)

1. Anschlußvorrichtung zwischen einem Kühlrohr (2) und einem zum Brennen von körnigem Material schrägliegenden Drehofen (1), welcher ringsherum eine Mehrzahl planetarisch angeordneten, zu der Achse des Ofens (1) achsparallelen kühlrohre (2) aufweist, die mit diesem drehfest sind, wobei jedes Rohr (2) mit dem Inneren des Ofens (1) über eine Verbindungsleitung (3) verbunden ist, die tangential vorne in Drehrichtung an das obere Rohrende angeschlossen ist, das durch eine zur Achse des Rohres (2) in Materialflußrichtung nach unten geneigte Wand (5) verschlossen ist und die Wandung des Rohres (2) entlang einer Schnittkante (51) schneidet, die sich um die Achse des Rohres (2) bis zu einem nach unten winkelartig versetzten Punkt K spiralförmig windet, dadurch gekennzeichnet, daß die Verschlußwand (5) als ein Umdrehungszylinderausschnitt ausgebildet ist, dessen Mantellinien parallel zu dem obenliegenden Teil der Kontur der Austrittsöfnung (32) der Verbindungsleitung (3) an dem Berührungspunkt der Leitung (3) und des Rohres (2) verlaufen, so daß die Schnittkante (51) über einen bestimmten Abschnitt mit diesem obenliegenden Teil der Austrittsöffnung (32) zusammenfällt, und daß in dem Schüttbereich die Verschlußwand (5) mit der Wandung des Rohres (2) eine Schurre (54) bildet, deren Sohle durch diese spiralförmige Kante (51) gebildet ist und in welcher sich das Material bei Schüttbeginn ansammelt um einen Schutzpolster zu bilden, wobei diese Schurre (54) bei einem Schnitt durch eine zur Achse des Rohres (2) querverlaufende Ebene eine unter der Austrittsöffnung (32) der Verbindungsleitung (34) sich öffnende V Form aufweist, und die Verschlußwand (5) derart ausgerichtet ist, daß sie sich während der Rohrumdrehung nach dem Materialaustrag nach unten neigt.
2. Anschlußvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die spiralförmige Kante (51) eine grössere Steigung als die der Materialfördergeschwindigkeit in dem Rohr (2) entsprechende Steigung aufweist.
3. Anschlußvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Achse (50) der zylindrischen Verschlußwand (5) wesentlich in der gemeinsamen Tangentialebene des Kühlrohres (2) und der Verbindungsleitung (34) liegt.
4. Anschlußvorrichtung nach einem der Ansprüche 2 und 3, dadurch gekennzeichnet, daß die zylindrische Verschlußwand (5) einen 2 bis 3 fach grösseren Durchmesser als der Durchmesser des Kühlrohres (2) aufweist.
5. Anschlußvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Achse (50) der zylindrischen Verschlußwand (5) die in der gemeinsamen Tangentialebene liegende Mantellinie des Kühlrohres schneidet und mit dieser einen Winkel zwischen 45 und 75° bildet.
6. Anschlußvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie eine Sperre (6) umfaßt, die das Rohr (2) unten an der Austrittsöffnung (32) der Verbindungsleitung (3) teilweise verschließt und deren Anordnung den Materialrückfluß zu der Öffnung (32) verhindert, wenn sich die Verbindungsleitung (3) über der Achse des Ofens (1) befindet, und im Gegenteil den Materialrückfluß entlang der Verschlußwand (5) nach oben zuläßt, wenn die Verbindungsleitung (3) unter der Achse des Ofens (1) liegt.
7. Anschlußvorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Sperre (6) aus einer das Rohr durchquerende Rohrleitung (60) besteht, die zum Durchlassen der Kühlluft an ihren Enden geöffnet ist und auf welcher eine Wand (6) aus feuerfestem Material abgestützt ist.
8. Anschlußvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Verbindungsleitung (3) aus zwei als Kniestück ausgebildete Zylinderteile (33, 34) besteht, dessen Spitze in Drehrichtung des Ofens (1) ausgerichtet ist und dessen Achsen miteinander einen Winkel zwischen 20 und 40° bilden, wobei das erste Teil (33) zum Ofen (1) radial ausgerichtet ist und das zweite Teil (34) eine mit dem Kühlrohr (2) gemeinsame Tangentialebene aufweist.
9. Anschlußvorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß das zweite Teil (34) einen kreisförmigen geraden Querschnitt und das erste Teil (33) einen elliptischen geraden Querschnitt aufweisen.
EP19790400153 1979-03-08 1979-03-08 Verbindungsvorrichtung zwischen einem Drehrohrofen und Satellitenkühlrohren Expired EP0015349B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19790400153 EP0015349B1 (de) 1979-03-08 1979-03-08 Verbindungsvorrichtung zwischen einem Drehrohrofen und Satellitenkühlrohren
DE7979400153T DE2966242D1 (en) 1979-03-08 1979-03-08 Junction device between a rotary kiln and planetary coolers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19790400153 EP0015349B1 (de) 1979-03-08 1979-03-08 Verbindungsvorrichtung zwischen einem Drehrohrofen und Satellitenkühlrohren

Publications (2)

Publication Number Publication Date
EP0015349A1 EP0015349A1 (de) 1980-09-17
EP0015349B1 true EP0015349B1 (de) 1983-10-05

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Application Number Title Priority Date Filing Date
EP19790400153 Expired EP0015349B1 (de) 1979-03-08 1979-03-08 Verbindungsvorrichtung zwischen einem Drehrohrofen und Satellitenkühlrohren

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DE (1) DE2966242D1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1322111A (en) * 1971-05-25 1973-07-04 Smidth & Co As F L Rotary kiln
BE788997A (fr) * 1971-09-20 1973-01-15 Smidth & Co As F L Four rotatif a tubes refroidisseurs
BE788998A (fr) * 1971-09-20 1973-01-15 Smidth & Co As F L Four rotatif
DE2418564C3 (de) * 1974-04-17 1985-05-09 Krupp Polysius Ag, 4720 Beckum Drehrohrofen mit Planetenkühler

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EP0015349A1 (de) 1980-09-17
DE2966242D1 (en) 1983-11-10

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