US3704873A - Method and apparatus for cooling cement clinker - Google Patents

Method and apparatus for cooling cement clinker Download PDF

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Publication number
US3704873A
US3704873A US172857A US3704873DA US3704873A US 3704873 A US3704873 A US 3704873A US 172857 A US172857 A US 172857A US 3704873D A US3704873D A US 3704873DA US 3704873 A US3704873 A US 3704873A
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United States
Prior art keywords
cooler
opening
kiln
air
tube
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Expired - Lifetime
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US172857A
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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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Filing date
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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 chutes together with the clinker inlet ends of the tubes are exposed to intense heat, so that for durability they have to be made of very expensive materials.
  • the additional air may be introduced into the cooler tube through several openings which may be uniformly distributed throughout its length, but may preferably be introduced exclusively at or near the clinker inlet end of the cooler tube.
  • a further result obtained is an air-quenching of the clinker, which in certain cases has been found useful.
  • the additional amount of air is preferably only introduced into the individual cooler tube essentially during such intervals in the rotation of the kiln during which clinker is passing through the chute of the cooler tube.
  • each cooler tube has at one end an opening constituting the inlet for cooling air and the outlet for cooled clinker. At the other end each tube has an opening which is connected with the interior of the kiln through a connecting pipe. This constitutes the chute for the entrance of hot clinker from the kiln and also the inlet to the kiln for the cooling air from the cooler tube.
  • a number of openings for introducing additional air are provided, preferably near the transition between the cooler tube and the chute.
  • Each individual opening for introducing additional air may preferably beprovided with agrate serving to prevent clinker from leaving the cooler tube through the opening.
  • Advantageously opening for introducing additional air may furthermore be provided with means to ensure that the opening is free during the intervals of the rotation of the kiln in which the amount of cooling air introduced through the opening has an opportunity of sweeping the clinker, while it is closed during the remaining time.
  • the said means for alternately uncovering and covering the opening for introducing additional air may according to the invention consist of a weight-loaded or compulsorily controlled damper, advantageously a swivel damper.
  • the supply of air may be continued after the clinker has ceased to move into the tube during the rotation of the kiln, but while the air still comes into contact with clinker on the bottom of the tube.
  • the additional air may be simply drawn into the kiln by the suction in it, in the same way as the main cooling air passing through each tube is drawn into the kiln, or air may be forced in by a fan or otherwise. If the air is passed through clinker already on the bottom of the tube forced draught is necessary.
  • the rotating kiln/cooler system may be equipped with fans, preferably one for each cooler tube, adapted to force cooling air through the opening or openings for additional air, preferably through an outer casing.
  • FIG. 1 is a view partly in vertical section and partly in elevation showing the lower or right end portion of a rotary kiln having planetary cooler tubes mounted thereon.
  • FIG. 2 shows diagrammatically a vertical longitudinal section of the parts adjacent. to the clinker chute for one of the cooler tubes of FIG. 1 with a single opening for introducing additional air arranged near the clinker inlet end of the cooler tube.
  • FIG. 3 shows an embodiment corresponding to that shown in FIG. 1, but with a grate before the opening.
  • FIG. 4 shows an embodiment with a single opening for introducing additional air and with a weight-loaded swivel damper.
  • FIG. 5 shows diagrammatically a cross-section taken on the line 5-5 of FIG. 4.
  • FIG. 6 shows diagrammatically a vertical longitudinal section of the parts adjacent to a clinker chute for a rotary kiln planetary cooler according to the invention with a single opening for introducing additional air and with a fan mounted on the cooler tube.
  • FIG. 7 shows a corresponding section with air introduced by the action of a fan through a perforated plate section and
  • FIG. 8 shows a section taken on the line 8-8 of FIG.
  • FIG. 1 there is shown the lower end portion of a rotary kiln shell 1 which in this instance is provided with a refractory lining.
  • a rotary kiln shell 1 Arranged in planetary fashion and equally spaced around the circumference of shell 1 there are numerous cooler tubes 2, only the uppermost and lowermost of which are illustrated.
  • the axes of these cooler tubes are parallel to the axis of kiln shell 1 and the entrance of the clinker into tubes 2 is through a series of inlet openings 2b.
  • Connected with each of these openings is a pipe forming a chute 3 which is connected to a cooler tube 2 near its-right end.
  • the lower end of kiln shell 1 is permanently closed by an end member 2f.
  • FIGS. 26 hot clinker 4 is passing through chute 3 shortly after a cooler tube 2 has on the rotation of the kiln passed its bottom position.
  • the movement of the cooling air drawn through the cooler tube 2 and further through the chute 3 into the kiln is indicated by arrows.
  • the said cooling air consists partly of a main flow of air drawn into the cooler tube through its clinker outlet 2e and chamber 2d and partly of an additional flow of air drawn into the cooler tube through an opening 5, and as indicated by the arrows the said additional air unites with the main flow of cooling air on its way to the rotary kiln in or directly before the chute 3 and subjects the clinker falling or having just fallen through the chute to an air-quenching.
  • the opening 5 is staggered somewhat in the direction of the axis of the cooler tube in order to prevent clinker from leaving the cooler tube 2 through the said opening.
  • FIG. 3 shows by way of example a built-in grate 6 covering the opening 5 and thus constituting another means to prevent clinker from leaving the cooler tube through the said opening. If there is such a grate, the inlet 5 need not necessarily be offset radially inwards.
  • FIGS. 4 and 5 show control of the air flow through the inlet 5 by dampers 7 pivoted on pins 8 which are mounted in flanges 9 on the ends of the inlets 5 and are weighted as shown at 10. As the kiln rotates openings 11 in the dampers 7 are alternately brought into and out of register with the inlets 5.
  • FIG. 6 shows a fan 12 mounted on the end of the cooler tube 2, there being as many fans as there are tubes.
  • This fan operates continuously, and it may deliver some air to the cooler tube at all times.
  • a damper operated by gravity or a cam is provided on its suction side to cut the air delivery down to a minimum except when the supplementary air is required.
  • a damper may be so arranged in a closed circuit through which the air is circulated that supplementary air flows out of this circuit into the cooler tube only when required.
  • FIGS. 7 and 8 show a construction in which a fan 13 delivers air into a hood 14 which surrounds part of the cooler tube.
  • the part thus surrounded is formed as a grate with openings 15 small enough to retain pieces of clinker.
  • This grate extends round that part of the circumference of the tube which receives the clinker and also for a little distance beyond this in the left-hand direction as seen in FIG. 8 so that air can be passed through the clinker on the bottom of the tube afterthe kiln has rotated in such a position that clinker is no longer falling through the chute.
  • a method according to claim 2 characterized in that the additional air is introduced into the individual cooler tube only during the intervals in the rotation of the kiln during which solid material is passing through the chute of the cooler tube.
  • Apparatus for cooling solid material treated in a rotary kiln which comprises a plurality of cooler tubes arranged in planetary fashion around the outlet end of a rotary kiln with their axes parallel or substantially parallel to the axis of the kiln, each cooler tube having at one end an opening forming an inlet for cooling air and the outlet for cooled solid material, and at the other end an opening which is connected with the interior of the kiln through a chute for hot solid material from the kiln and the inlet to the kiln for the cooling air from the cooler tube, characterized in that the wall of the cooler tube is provided with at least one opening for introducing additional cooling air.
  • a cooler as claimed in claim 4 characterized in that there is only one opening for introducing additional air, provided near the junction between the cooler tube and the chute.
  • a cooler as claimed in claim 4 characterized in that each individual opening for introducing additional air is provided with a grate serving to prevent solid material from leaving the cooler tube through the opening.
  • the rotating kiln/cooler is provided with fans, advantageously one for each cooler tube, connected to force cooling air through each opening for additional air.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
US172857A 1970-09-07 1971-08-18 Method and apparatus for cooling cement clinker Expired - Lifetime US3704873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4280870 1970-09-07

Publications (1)

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US3704873A true US3704873A (en) 1972-12-05

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ID=10426062

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US172857A Expired - Lifetime US3704873A (en) 1970-09-07 1971-08-18 Method and apparatus for cooling cement clinker

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US (1) US3704873A (de)
CA (1) CA946150A (de)
GB (1) GB1297314A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243382A (en) * 1978-02-10 1981-01-06 Kawasaki Jukogyo Kabushiki Kaisha Material distributing means for rotary drum type heat treatment apparatus
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln
US5555639A (en) * 1995-05-18 1996-09-17 Productization Inc. Rotary drum dryer
US6474985B1 (en) * 2002-04-17 2002-11-05 Metso Minerals Industries, Inc. Toothed grate for rotary kiln peripheral discharge openings
TWI684740B (zh) * 2015-04-17 2020-02-11 奧地利商奧地利冶金技術股份有限公司 用於冷卻熱散裝材料的冷卻器及此種冷卻器之應用

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1678313A (en) * 1925-07-31 1928-07-24 Robert L S Atkinson Battery tool
US3512764A (en) * 1967-06-20 1970-05-19 Smidth & Co As F L Rotary kiln having planetary cooling tubes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1678313A (en) * 1925-07-31 1928-07-24 Robert L S Atkinson Battery tool
US3512764A (en) * 1967-06-20 1970-05-19 Smidth & Co As F L Rotary kiln having planetary cooling tubes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243382A (en) * 1978-02-10 1981-01-06 Kawasaki Jukogyo Kabushiki Kaisha Material distributing means for rotary drum type heat treatment apparatus
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln
US5555639A (en) * 1995-05-18 1996-09-17 Productization Inc. Rotary drum dryer
US6474985B1 (en) * 2002-04-17 2002-11-05 Metso Minerals Industries, Inc. Toothed grate for rotary kiln peripheral discharge openings
TWI684740B (zh) * 2015-04-17 2020-02-11 奧地利商奧地利冶金技術股份有限公司 用於冷卻熱散裝材料的冷卻器及此種冷卻器之應用
US10563921B2 (en) * 2015-04-17 2020-02-18 Primetals Technologies Austria GmbH Delimitation for reduction of the dust emissions for a cooler for cooling hot bulk material

Also Published As

Publication number Publication date
CA946150A (en) 1974-04-30
GB1297314A (de) 1972-11-22

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