US3556495A - Rotary kilns with planetary coolers - Google Patents

Rotary kilns with planetary coolers Download PDF

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Publication number
US3556495A
US3556495A US788702A US3556495DA US3556495A US 3556495 A US3556495 A US 3556495A US 788702 A US788702 A US 788702A US 3556495D A US3556495D A US 3556495DA US 3556495 A US3556495 A US 3556495A
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US
United States
Prior art keywords
tube
rotary kiln
cooler
kiln according
inlet end
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Expired - Lifetime
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US788702A
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English (en)
Inventor
Flemming Edvin Jensen
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FLSmidth and Co AS
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FLSmidth and Co AS
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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

Definitions

  • This invention relates to that kind of rotary kiln which has a number of cylindrical-cooler tubes mounted in planetary fashion around the outlet end of the kiln with their axes parallel or substantially parallel to the axis of the kiln, the inlet end of each cooler tube being connected to an outlet of the rotary kiln by a supply chute.
  • the cooler tubes are usually arranged symmetrically around the discharge end of the kiln and may extend from their inlets in a direction either upwards along the kiln or downwards away from the inlet end of the kiln.
  • the hot material leaving the rotary kiln through the com municating chutes is cooled in the cooler tubes by air which passes through the tubes in countercurrent to the stream of hot material. In the cooler the air takes up heat and is subsequently utilized in the kiln as secondary combustion air.
  • each cooler tube of a planetary cooler has lifters which produce curtains of falling material and is thermally insulated to reduce the loss of heat by radiation.
  • the temperature of the spent-cooling air and of the cooled material will rise.
  • the heat-exchange between the material and the cooling air is so good because of the passage of the air through the curtains that the overall thermal economy is improved, that is to say the heat lost in the material that leaves the tubes is more than compensated for by the increase in the heat carried into the kiln in the secondary air combustion.
  • each cooler tube extending from the inlet end the temperature is so high that high-quality heat-resistant insulating material has to be provided.
  • This length is preferably insulated by a layer of insulating material inserted between the inner wall of the cooler tube and wearing plates which form the wall of the tube in contact with the hot material, because the amount of expensive insulation material can then be kept low.
  • the insulating material is very well protected against damage, particularly if the wearing plates are recessed on their outer faces to receive it. Over the remaining length ordinary insulating material surrounding the tube is generally sufficient.
  • each wearing plate may be bolted to the tube wall and to minimize heat transmission from them to the tube wall and subsequent heat radiation to the surroundings.
  • each wearing plate may advantageously have small supporting ribs on its outer face, only these ribs making direct contact with the tube wall.
  • the preferred lifters are trough-shaped helical flights, and they may advantageously be composed of sections, each section being carried by a wearing plate.
  • FIG. 1 is a vertical section through the outlet end of the kiln
  • FIG. 2 is a section on the line 2-2 in FIG. 1;
  • FIG. 3 is a vertical section on a larger scale through a cooler tube and the corresponding outlet opening of the kiln;
  • FIG. 4 is a top view of sections of which a conveyor flight is composed
  • FIG. 5 is a section on the line 5-5 of FIG. 4;
  • FIG. 6 is a top view of a section with reinforcements.
  • FIG. 2 The drawings show a rotary kiln I with a refractory lining 3 for the burning of a charge 2 (FIG. 2) of material, for instance cement raw material to clinker.
  • v 1 a charge 2 of material, for instance cement raw material to clinker.
  • each tube Near its lower end the kiln has a number of outlet openings 4 communicating through chutes 5 with a corresponding number of cooler tubes 6 mounted with their axes parallel to the axis of the kiln and arranged equidistantly around the end of the kiln in a planetary fashion.
  • Each chute has a heatand wear-resistant ceramic lining 7 and the inlet end of each cooler tube is also provided with such a lining 8.
  • each tube Over the main length each tube is lined by rectangular wearing plates 14 (FIG. 5).
  • Each cooler tube has helical trough-shaped conveyor flights 9 throughout substantially its whole length.
  • Each cooler tube is thermally insulated by a layer of ordinary insulating material ll outside the tube wall in the relatively cool part of the tube, which may be mechanically protected and held in place in any conventional way, and by another layer of insulation 12 on the inside of the tube wall in the hot part of the tube, i.e. at the material-inlet end.
  • This layer 12 is not continuous, but rather consists of mats 16 (FIG. 5) housed in recesses on the outer faces of the wearing plates 14.
  • the conveyor flights 9 are composed of sections 13 (FIGS. 4 and 5) each carried by a wearing plate 14, and the wearing plates 14 are of such dimensions that if each carries one section 13 a suitable number of conveyor flights is provided.
  • Each section 13 is trough-shaped and inclined to the sides of the plate 14 that carries it.
  • the wearing plates are bolted to the cooler tube by means of bolts 17.
  • the heads of the bolts are housed in recesses 15 and located under the flight section 13 so as to be protected against impact and wear by the material discharged from other conveyor flights.
  • Advantageously bolts 17 may be isolated from the wearing plates by lining the bolt holes and by inserting insulating washers under the bolt heads and nuts.
  • the sections 13 may be stiffened by external stays 19 or internal ribs 20, or by both as shown in FIG. 5,
  • the ribs 20 do not interfere with the conveying function of the flights, as the material while in the trough-shaped flights does not and should not to any appreciable extent move in the longitudinal direction.
  • the ribs 20 prevent the cooling air from passing along the conveyor flights.
  • the conveyor flights lift the material and in the course of rotation discharge it again in the form of curtains which are inclined to the axis of the kiln.
  • a ring of scoops M is provided at the airinlet end of each tube.
  • These scoops have sidewalls and constitute a series of buckets, which pickup material from the bottom of the tube and carry it upwards until the kiln, and therefore the tube, reaches such an angular position in the course of rotation that the material begins to fall out of the scoops 10 to form a curtain extending over approximately half the cross-sectional area of the tube, and prevents the air from passing uninterruptedly into the tube along comparatively long channels.
  • a rotary kiln having a number of cylindrical-cooler tubes mounted in planetary fashion around its outlet end with their axes parallel or substantially parallel to the kiln axis, the inlet end of each cooler tube being connected to an outlet of the rotary kiln by a supply chute, in which lifters which produce curtains of falling material when the kiln is in use are provided in each cooler tube, the improvement wherein each cooler tube is lined with wearing plates, some of which are provided with lifters, the wearing plates being spaced inwardly from the inner surface of the tube, removably secured thereto and thermally insulated from the tube to reduce loss of heat by radiation.
  • a rotary kiln according to claim 1 in which a lengthwise portion of each cooler tube extending from the inlet end is internally insulated by a layer of insulating material disposed between the wearing plates and the inner wall of the cooler tube.
  • a rotary kiln according to claim 3 inwhich the wearing plates, beneath which there is insulating material, are recessed to receive it.
  • a rotary kiln according to claim 4 in which the wearing plates that have recesses are bolted to the cooler tube wall and have small supporting ribs.,on their outer faces, only those ribs making direct contact with the tube wall.
  • a rotary kiln according to claim 1 in which the lifters are trough-shaped helical conveyor flights composed of sections, each section being mounted on a wearing plate.
  • a rotary kiln according to claim 6 in which the conveyor flights are stiffened by external stays or internal transverse ribs or both.
  • a rotary kiln according to claim 6 having in addition a ring of scoops at the air-inlet end of each tube to produce a transverse curtain of material over that side of the tube in which conveyor flights are moving upwards and thus to impede the entry of the incoming air into some of the channels formed between adjacent curtains.

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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)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
US788702A 1968-01-22 1969-01-03 Rotary kilns with planetary coolers Expired - Lifetime US3556495A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3289/68A GB1155677A (en) 1968-01-22 1968-01-22 Rotary Kilns with Planetary Coolers

Publications (1)

Publication Number Publication Date
US3556495A true US3556495A (en) 1971-01-19

Family

ID=9755516

Family Applications (1)

Application Number Title Priority Date Filing Date
US788702A Expired - Lifetime US3556495A (en) 1968-01-22 1969-01-03 Rotary kilns with planetary coolers

Country Status (8)

Country Link
US (1) US3556495A (fr)
BE (1) BE727239A (fr)
DE (1) DE1902812A1 (fr)
ES (1) ES362766A1 (fr)
FR (1) FR2000558A1 (fr)
GB (1) GB1155677A (fr)
NL (1) NL159780B (fr)
SE (1) SE348550B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813211A (en) * 1971-09-20 1974-05-28 Smith S & Co Cooler tubes for rotary kiln
US3844709A (en) * 1973-01-03 1974-10-29 Fives Cail Babcock Rotary kiln with cooling cells
US3920381A (en) * 1973-02-01 1975-11-18 Polysius Ag Rotary furnace having a planetary cooler
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307108C3 (de) * 1973-02-14 1985-07-11 Klöckner-Humboldt-Deutz AG, 5000 Köln Hubschaufel für Kühlrohre mit feuerfester Innenauskleidung
GB1446295A (en) * 1975-01-22 1976-08-18 Smidth & Co As F L Rotary drums
NZ333407A (en) * 1996-09-07 2000-03-27 Company Ltd Equa Incinerator with decomposing chamber, combusting chamber, catalytic converter and waste vapor condenser, and with counterflow heat exchange between air and exhaust ducts

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1885845A (en) * 1930-06-20 1932-11-01 Smidth & Co As F L Manufacture of hydraulic cement
US2845259A (en) * 1954-10-07 1958-07-29 Smidth & Co As F L Combined kiln and cooler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1885845A (en) * 1930-06-20 1932-11-01 Smidth & Co As F L Manufacture of hydraulic cement
US2845259A (en) * 1954-10-07 1958-07-29 Smidth & Co As F L Combined kiln and cooler

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813211A (en) * 1971-09-20 1974-05-28 Smith S & Co Cooler tubes for rotary kiln
US3844709A (en) * 1973-01-03 1974-10-29 Fives Cail Babcock Rotary kiln with cooling cells
US3920381A (en) * 1973-02-01 1975-11-18 Polysius Ag Rotary furnace having a planetary cooler
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln

Also Published As

Publication number Publication date
ES362766A1 (es) 1970-11-16
NL159780B (nl) 1979-03-15
SE348550B (fr) 1972-09-04
GB1155677A (en) 1969-06-18
DE1902812A1 (de) 1969-09-11
FR2000558A1 (fr) 1969-09-12
NL6901028A (fr) 1969-07-24
BE727239A (fr) 1969-07-22

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