US3512764A - Rotary kiln having planetary cooling tubes - Google Patents

Rotary kiln having planetary cooling tubes Download PDF

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Publication number
US3512764A
US3512764A US734918A US3512764DA US3512764A US 3512764 A US3512764 A US 3512764A US 734918 A US734918 A US 734918A US 3512764D A US3512764D A US 3512764DA US 3512764 A US3512764 A US 3512764A
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US
United States
Prior art keywords
kiln
cooler
tube
outlet
tubes
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Expired - Lifetime
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US734918A
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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
Publication date
Application filed by FLSmidth and Co AS filed Critical FLSmidth and Co AS
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Publication of US3512764A publication Critical patent/US3512764A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/10—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material
    • F28C3/12—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid
    • F28C3/18—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid the particulate material being contained in rotating drums
    • 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 specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/40—Planetary coolers

Definitions

  • each tube connects with the interior of the kiln shell and the opposite end of each cooler tube is provided with an extension having an open ing with an arcuate discharge face through which particulate solid material is discharged after leaving the end of the kiln and passing through the cooler tube.
  • Means is provided for either drawing or blowing air through the cooler tubes, the air entering through the discharge openings for the solid material and leaving the cooler tubes at their opposite ends to enter the kiln as secondary air of combustion.
  • a semi-cylindrical or arcuate plate is arranged in stationary position so that the arcuate discharge faces of the cooler tubes successively come into register with this plate to reduce the entrance of air to the tubes during that portion of the rotation of the kiln during Which the hot particulate solid material enters the opposite end of a particular cooler tube.
  • cooler tubes mounted in planetary fashion around the outlet end of the kiln.
  • Each of these cooler tubes has at one end an opening that forms an inlet for cooling air and an outlet for the cooled solid material, and at the other end an opening that communicates with the interior of the kiln through a chute and forms an outlet for the hot material leaving the kiln and an inlet for the cooling air entering the kiln.
  • This cooling air flows through the chute into the kiln to act as secondary air of combustion.
  • the cooling air may be either drawn or blown through the cooler tubes.
  • each chute As the kiln rotates, the mouth of each chute in turn comes into register with the particulate material lying along the bottom of the kiln and thus the passage of material down each chute is intermittent, occurring only during a comparatively small angle of rotation of the kiln.
  • Material burnt or otherwise treated in a rotary kiln is usually granular and contains a proportion of dust or tines which may be picked up by the cooling air as it passes through the chute while the material is also passing from the kiln through the same chute into the cooler tube.
  • the object is again to prevent air entering each cooler tube While hot particulate material is entering the tube from the kiln.
  • the outlet openings for solid material in the cooler tubes lie in the surface of an imaginary cylinder concentric with the kiln shell, and throughout that part of the rotation of the kiln during which hot material may enter the cooler tube through the inlet at the other end these outlet openings successively come into register with a semi-cylindrical plate by which the passage of air through them is stopped orreduced.
  • the plate may be adjusted in position to allow a small amount of air to flow through the tube.
  • the plate is external to the cooler tubes and thus easy to adjust or replace, and as it is not a moving part it has no operation which can be interfered with by the material.
  • the plate is resiliently mounted to move radially to yield if any lumps of material become trapped between it and the cooler tubes so that neither the plate nor the cooler tubes will then be damaged.
  • the outlet openings of the cooler tubes may depart slightly from the imaginary cylinder, and the resilient mounting of the late allows any such departure to occur without harm.
  • FIG. 1 is a vertical central section of the lower end of a rotary kiln having planetary cooler tubes, only two of which are shown;
  • FIG. 2 is a view in vertical section in the planes indicated by broken line 22 in FIG. 1;
  • FIG. 3 is a view similar to FIG. 2 showing a modification
  • FIG. 4 is a perspective view of the outlet end of one of the cooler tubes of FIG. 2..
  • FIG. 1 shows the lower or discharge end of a rotary kiln 1 of conventional construction with openings 2 in its wall, each opening 2. forming the mouth of a discharge chute 3 for the solid particulate material which is joined to a planetary cooler tube 4. Discharge chute 3 also serves to deliver cooling and combustion air through opening 2 into the kiln 1.
  • Cooler tube 4 consists essentially of a cylinder '5 through which the particulate material to be cooled moves from left to right as seen in FIG. 1, and an outlet section 6 from which it is discharged.
  • each outlet section 6 comprises a semi-cylindrical extension of the cylinder 5 and is closed at the end by a plate 7. That part of the end of cylinder 5 which is not in register with the section 6 is closed by a plate 8 (FIG. 4), which has a tongue 8a forming a half turn of a screw inside the cylinder 5 so as to bar the direct passage of solid material into the outlet section 6.
  • the outlet section 6 has a transverse opening 9 forming the outlet for cooled solid material, the edges 9a of the walls that bound this outlet lying in an imaginary cylinder concentric with the kiln shell.
  • One of these walls is formed by a plate which is flat instead of being semicylindrical and is inclined inwardly towards the axis of the cooler tube so as to serve as a guide for the material to be discharged as will appear later on.
  • cooler tubes may receive hot particulate material in this way when they are about in the positions of those marked 4A and 4B, and at any given angle of rotation there may be two cooler tubes receiving hot material at once. This hot material passes along the tube as described above while it is being cooled by the air flowing in the opposite direction through the tube, and the layers of solid material in the tubes are shown at 12.
  • the material falls onto a chute 14 not on drawings. All the outlet sections 6 and the chute 14 are enclosed in a housing 15 shaped at the bottom as a hopper 16 from which the cooled material is continuously carried away.
  • the cooling air is either drawn or blown into housing 15. It may enter through the opening at the bottom of hopper 16 where the solid material is discharged. It may also be supplied through an entrance collar 26 at one side of the housing 15. Any desired source of air may be used such as for example a motor driven fan 27 mounted within this housing.
  • each opening 9 comes into register with the plate 17 when the cooler tube in question is in a position, as indicated at 4B, to receive material from the kiln.
  • outlet sections 19 are essentially cylindrical extensions of the cylinders 5 With spout-like parts, the mouths 20 of which form the outlet openings for the solid material.
  • Each section 19 is separated from the interior of the cylinder 5 by a partition 21 corresponding to tongue 8a and formed as at least one full turn of a screw thread.
  • the shape of the housing 15a is changed of cooler tubes mounted in planetary fashion around the outlet end of the kiln, each cooler tube having at one end an opening that forms an inlet for cooling air and an outlet for cooled particulate solid material, and at the opposite end an opening that communicates with the interior of the kiln through a chute and forms an inlet for hot particulate material for the kiln and an outlet for the cooling air, so that this air flows through the chute to act as secondary air of combustion in the kiln, in which the outlet openings for said material in the cooler tubes lie in the surface of an imaginary cylinder concentric with the kiln shell and, throughout that part of the rotation of the kiln during which hot material may enter the cooler tube through the inlet at the other end, successively come into register with a semi-cylindrical plate and sufficiently close thereto so that the passage of air through said openings is substantially prevented.
  • each cooler tube comprises a cylinder formed with an extension having a spout-like portion the mouth of which forms the outlet opening for the solid material, and which is separated from the interior of the cylinder by a partition formed as at least one full turn of a screw thread.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
US734918A 1967-06-20 1968-06-06 Rotary kiln having planetary cooling tubes Expired - Lifetime US3512764A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28345/67A GB1137213A (en) 1967-06-20 1967-06-20 Rotary kilns with planetary cooling tubes

Publications (1)

Publication Number Publication Date
US3512764A true US3512764A (en) 1970-05-19

Family

ID=10274215

Family Applications (1)

Application Number Title Priority Date Filing Date
US734918A Expired - Lifetime US3512764A (en) 1967-06-20 1968-06-06 Rotary kiln having planetary cooling tubes

Country Status (8)

Country Link
US (1) US3512764A (xx)
BE (1) BE716867A (xx)
DE (1) DE1758519A1 (xx)
ES (1) ES355193A1 (xx)
FR (1) FR1569405A (xx)
GB (1) GB1137213A (xx)
NL (1) NL6808369A (xx)
SE (1) SE328966B (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704873A (en) * 1970-09-07 1972-12-05 Smidth & Co As F L Method and apparatus for cooling cement clinker
US3775042A (en) * 1971-03-10 1973-11-27 Polysius Ag Rotary kiln with a plurality of cooling pipes
US3824069A (en) * 1972-03-09 1974-07-16 Kloeckner Humboldt Deutz Ag Method of increasing the cooling effect of a rotary kiln-satellite cooler and device for carrying out the method
DE2421463A1 (de) * 1973-05-08 1974-11-28 Smidth & Co As F L Rotierender kuehler fuer koerniges oder pulverfoermiges material
US4089634A (en) * 1975-07-23 1978-05-16 F. L. Smidth & Co. Planetary cooler system for rotary kiln plant and the like
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln
US11674757B1 (en) * 2020-06-16 2023-06-13 National Technology & Engineering Solutions Of Sandia, Llc Direct contact particle-fluid heat exchanger

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705460A (en) * 1971-01-18 1972-12-12 Peters Ag Claudius Material cooling apparatus
DE2418564C3 (de) * 1974-04-17 1985-05-09 Krupp Polysius Ag, 4720 Beckum Drehrohrofen mit Planetenkühler

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1652168A (en) * 1925-12-07 1927-12-13 Smidth & Co As F L Rotary kiln and cooler
US1830959A (en) * 1928-02-07 1931-11-10 Smidth & Co As F L Rotary kiln and cooler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1652168A (en) * 1925-12-07 1927-12-13 Smidth & Co As F L Rotary kiln and cooler
US1830959A (en) * 1928-02-07 1931-11-10 Smidth & Co As F L Rotary kiln and cooler

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704873A (en) * 1970-09-07 1972-12-05 Smidth & Co As F L Method and apparatus for cooling cement clinker
US3775042A (en) * 1971-03-10 1973-11-27 Polysius Ag Rotary kiln with a plurality of cooling pipes
US3824069A (en) * 1972-03-09 1974-07-16 Kloeckner Humboldt Deutz Ag Method of increasing the cooling effect of a rotary kiln-satellite cooler and device for carrying out the method
DE2421463A1 (de) * 1973-05-08 1974-11-28 Smidth & Co As F L Rotierender kuehler fuer koerniges oder pulverfoermiges material
US4089634A (en) * 1975-07-23 1978-05-16 F. L. Smidth & Co. Planetary cooler system for rotary kiln plant and the like
US4243384A (en) * 1978-04-11 1981-01-06 F. L. Smidth & Company Rotary kiln
US11674757B1 (en) * 2020-06-16 2023-06-13 National Technology & Engineering Solutions Of Sandia, Llc Direct contact particle-fluid heat exchanger

Also Published As

Publication number Publication date
GB1137213A (en) 1968-12-18
SE328966B (xx) 1970-09-28
DE1758519A1 (de) 1971-02-11
ES355193A1 (es) 1969-11-16
NL6808369A (xx) 1968-12-23
BE716867A (xx) 1968-12-20
FR1569405A (xx) 1969-05-30

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