US3811824A - Cooler tubes for rotary kiln - Google Patents

Cooler tubes for rotary kiln Download PDF

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Publication number
US3811824A
US3811824A US00288491A US28849172A US3811824A US 3811824 A US3811824 A US 3811824A US 00288491 A US00288491 A US 00288491A US 28849172 A US28849172 A US 28849172A US 3811824 A US3811824 A US 3811824A
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US
United States
Prior art keywords
cooler tube
cooler
tube
chute
kiln
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00288491A
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English (en)
Inventor
S Theil
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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 FLSmidth and Co AS filed Critical FLSmidth and Co AS
Application granted granted Critical
Publication of US3811824A publication Critical patent/US3811824A/en
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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 peculiar to rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/40—Planetary coolers

Definitions

  • the invention relates to a rotary kiln of the type having a body or shell and a plurality of cooler tubes arranged in a'planetary fashion around the outlet end of the kiln shell with-each tube connected adjacent one of its ends to an outlet opening in the kiln shell by a communicating chute.
  • the kiln shell in rotary kilns of the type disclosed herein is generally mounted such that its axis of rotation is inclined upward in the direction opposite to the direction of material movement or flow within the kiln body.
  • the cooler tubes extend alongside the kiln shell and areinclined upward in the direction in which material flows through the cooler tubes (i.e., in a direction opposite to the direction of material flow through the kilnshell.)
  • Such cooler tubes are commonly known as uphill cooler tubes.
  • the cooler tubes extend away from the outlet end of the kiln shell and are inclined downward in the direction in which the material flows through the cooler tubes (i.e., in the same direction as material flow through the kiln 'shell) in which caseth'e cooler tubes v
  • chutes are curved and formed asa part of a helix.
  • part of theinlet end of the cooler tube is formed as a section of a cylinder the axis of which is inclined to that of the tube so as to provide a surface down which material in the tube may slide during rotation of the tube.
  • the present invention is specifically concerned with a new and improved construction of the inlet end of a cooler tube to substantially eliminate back spill even when the charge in each cooler tube is larger than normal.
  • each cooler tube adjacent the communicating chute includes two or more partial and substantially conical surfaces having a common apex. At least one of the conical surfaces is concave to the interior of the cooler tube.
  • the other conical surface i.e., the one which is adjacent to the opening into the chute and over which material falling into the tube through the chute first passes upon rotation of the kiln is convex to the interior of the cooler tube.
  • the convex surface at the inlet end prevents backspill of material from the cooler tube as this surface conveys the material away from the opening during rotation of the kiln and cooler tubes.
  • the material is then advanced through each cooler tube by the concave surface.
  • the concave surface forms a continuation of the convex surface and acts as a screw conveyor.
  • FIG. 1 is a side elevation view, partially in cross section, of a kiln equipped with planetary cooler tubes according to this invention.
  • FIG. 2 is a cross-sectional view taken along the lines 2-2 of FIG. 1.
  • FIG. 3 shows the inlet end of a cooler tube according to this invention viewed in an axial direction
  • FIG. 4 is a top plan view of the inlet end of the cooler tube shown in FIG. 3 as viewed in the direction of arrows 4 in FIG. 3.
  • rotary kiln l is provided with a'refractory lining 3 for burning of a charge 2 of material (e.g., cement raw material) to clinker.
  • material e.g., cement raw material
  • each chute 5 includes a first and second part 5a and 5b which are disposed at an angle relative to each other to thereby define a knee-bend 50.
  • the cooler tubes 6 are the up-hill type previously described.
  • Each cooler tube 6 comprises a cylindrical tube.
  • the end wall of each cooler tube adjacent its inlet end includes a plate 13 forming a concavo-convex surface which, as shown in FIG. 3, comprises partial conical surfaces 7, 8 and 9 having a common apex l2. Surfaces 7, 8 and 9 form a guiding surface for the material as itv begins passage through the cooler tube.
  • the end wall also includes plane closure plates 10 and 11 arranged as shown.
  • Conical surface 7 is convex to the interior of the cooler tube and conical surfaces 8 and 9 are concave to the interior of the cooler tube.
  • the common apex 12 is, in the construction shown, located approximately on or near the axis of the cooler tube.
  • the concavo-convex or curved plate 13 may comprise an infinite number of conical surfaces to achieve the desired curvature although only three such surfaces are depicted in the construction shown in thedrawings.
  • the communicating chute leads into the cooler tube in substantially tangential relationship to convex surface 7 and through the interior surface of plane plate 11 which is oriented substantially parallel to the axis of the tube.
  • Convex conical surface 7 in turn, continues into concave conical surfaces 8 and 9.
  • the chute does not interfere with the convex surface 7 or the concave surfaces 8 and 9.
  • the convex surface serves as a continuation of the communicating chute and facilitates the transfer of material from the chute to the cooler tube.
  • the convex surface at the same time serves as a barrier preventing return of material into the chute which, as previously described, communicates with or opens into the interior of the cooler tube in a plane parallel to the axis of the tube and thereby not directly along the cylindrical surface of the tube.
  • part of the charge 2 in the kiln drops into the communicating chute 5 as the opening 4 of the communicating chute passes its lowermost position.
  • the material slides into the cooler tube and reaches at first the lowermost portion of the cylindrical wall of the cooler tube.
  • the concave surfaces act as a screw conveyor to push the material forward in the cooler tube.
  • the position of the communicating chute renders it possible to thermally insulate the chute separately without insulating or covering part of the inlet end of the cooler tube. This feature is important because this part of the cooler tube is exposed to intense heating by the incoming material and must necessarily radiate part of such heat; otherwise the said heat may cause damage to this part of the cooler tube.
  • each cooler tube is defined by at least one concave-convex guiding surface which comprises a first conical surface positioned at the outlet end of the communicating chute and convex to the interior of the cooler tube, a second conical surface positioned adjacent to said first conical surface and concave to the interior of the cooler tube, a third conical surface positioned adjacent to the second conical surface and concave to the interior of the cooler tube, said conical surfaces having a common apex and being positioned and oriented relative to the outlet opening of the communicating chute and the inlet opening of the cooler tube such that when the kiln is rotated, material falling from the outlet end of the rotating kiln into each communicating chute passes over said first conical surface of said guiding surface toward the
  • each cooler tube includes a plane surface oriented substantially parallel to the axis of the cooler tube;
  • each chute leads into its respective cooler tube substantially tangential to a convex portion of the concavo-convex surface and through said plane surface whereby the chute does not interfere with the concave and convex portions of the concavoconvex surface.
  • the common apex is located substantially on the axis of the tube.
  • each cooler tube isdefinedby a plurality of concave-convex guiding surfaces such that said interior end of each cooler tube functions as a screw conveyor which transfers material falling from the outlet end of each communicating chute into each cooler tube.
  • each chute includes a first and second pipe section disposed at an angle with respect to each other to thereby define a trap for back-spilling material passing from the respective cooler tube into the kiln shell.
  • said chute is thermally insulated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Incineration Of Waste (AREA)
US00288491A 1971-09-20 1972-09-13 Cooler tubes for rotary kiln Expired - Lifetime US3811824A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4376571 1971-09-20

Publications (1)

Publication Number Publication Date
US3811824A true US3811824A (en) 1974-05-21

Family

ID=10430228

Family Applications (1)

Application Number Title Priority Date Filing Date
US00288491A Expired - Lifetime US3811824A (en) 1971-09-20 1972-09-13 Cooler tubes for rotary kiln

Country Status (13)

Country Link
US (1) US3811824A (de)
JP (1) JPS5510839B2 (de)
AU (1) AU463246B2 (de)
BE (1) BE788997A (de)
BR (1) BR7206493D0 (de)
CA (1) CA977961A (de)
DE (1) DE2245996C2 (de)
ES (1) ES406829A1 (de)
FR (1) FR2154124A5 (de)
GB (1) GB1315070A (de)
IT (1) IT967572B (de)
SE (1) SE375604B (de)
ZA (1) ZA726082B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920381A (en) * 1973-02-01 1975-11-18 Polysius Ag Rotary furnace having a planetary cooler
US3994677A (en) * 1974-04-17 1976-11-30 Polysius Ag Rotary kiln with planetary coolers
US4222735A (en) * 1977-05-03 1980-09-16 Polysius Ag Cylindrical rotary kiln with satellite cooling tubes
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2966242D1 (en) * 1979-03-08 1983-11-10 Creusot Loire Junction device between a rotary kiln and planetary coolers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1074448A (en) * 1965-09-28 1967-07-05 F L Smidth & Company As Improvements relating to rotary kilns
DE6606702U (de) * 1967-05-17 1970-11-19 Polysius Ag Drehrohrofenkuehler

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920381A (en) * 1973-02-01 1975-11-18 Polysius Ag Rotary furnace having a planetary cooler
US3994677A (en) * 1974-04-17 1976-11-30 Polysius Ag Rotary kiln with planetary coolers
US4222735A (en) * 1977-05-03 1980-09-16 Polysius Ag Cylindrical rotary kiln with satellite cooling tubes
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln

Also Published As

Publication number Publication date
IT967572B (it) 1974-03-11
JPS4840823A (de) 1973-06-15
BE788997A (fr) 1973-01-15
DE2245996A1 (de) 1973-03-29
SE375604B (de) 1975-04-21
CA977961A (en) 1975-11-18
AU463246B2 (en) 1975-07-17
JPS5510839B2 (de) 1980-03-19
DE2245996C2 (de) 1983-03-24
ES406829A1 (es) 1975-10-16
GB1315070A (de) 1973-04-26
FR2154124A5 (de) 1973-05-04
BR7206493D0 (pt) 1973-09-18
ZA726082B (en) 1973-07-25
AU4681672A (en) 1974-03-28

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