US3502311A - Coolers for rotary kilns - Google Patents

Coolers for rotary kilns Download PDF

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Publication number
US3502311A
US3502311A US729275A US3502311DA US3502311A US 3502311 A US3502311 A US 3502311A US 729275 A US729275 A US 729275A US 3502311D A US3502311D A US 3502311DA US 3502311 A US3502311 A US 3502311A
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US
United States
Prior art keywords
kiln
sleeve
lining
outlet
cooler
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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
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US729275A
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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 US3502311A publication Critical patent/US3502311A/en
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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 specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/40—Planetary coolers

Definitions

  • This invention relates to coolers for material burnt or sintered in a rotary kiln, specifically to that type of cooler with comprises a number of cooler tubes mounted around the outlet end of the kiln with their axes parallel or substantially parallel to the axis of the kiln.
  • Each cooler tube has an inlet at one end of the tube and an outlet at the other end, the inlet end of each tube being connected to an outlet of the rotary kiln by a supply chute through which material to be cooled enters the cooler tube. Cooling air drawn or blown through each cooler tube passes as preheated secondary combustion air through the same chute to the interior of the kiln.
  • the cooler tubes are commonly arranged symmetrically around the kiln and may be parallel or inclined at. a slight angle to the axis of the kiln.
  • special devices such as lifters, scoops, or chains, are often provided inside the cooler tubes.
  • the cooler tubes may extend from their inlets either upwards towards the inlet end of the kiln or downwards away from the inlet end of the kiln.
  • the supply chutes to the cooler tubes are heated by the material to a high temperature, and this reduces their resistance to abrasion, thus increasing the rate of wear. For this reason the supply chutes have to be frequently replaced, and thus involves considerable loss of production during the shut-down of the kiln necessary for maintenance.
  • each supply chute is formed by a sleeve having a heat-resistant lining, the sleeve being inserted from the outside of the kiln into an outlet in the wall of the kiln and extending through the kiln shell to the interior surface of the kiln lining.
  • the inlet sleeve may then be connected directly to the cooler tube, or there may be an intermediate sleeve also with a heat-resistant lining between the inlet sleeve, and the cooler tube.
  • the inlet sleeve or the intermediate sleeve or both can easily be rep aced from the outside of the kiln.
  • the preferred form of heat resistant lining is one made of ceramic, since this is more resistant to wear at high temperatures than is a conventional brick refractory lining and can also be pro-formed and installed as a whole.
  • the lining or linings are in the form of a monolithic tube of ceramic, and such linings are not only simple to replace, but also strengthen the sleeves they are lining; alternatively the linings may be made up from several parts, for example formed from ringlike sections packed one on top of another in the sleeves.
  • Refractory linings particularly those of ceramic, are brittle, especially at edges and corners, and the ends of the linings of the sleeves should thus preferably be protected by means of annular steel rings mounted in the sleeves at either end of the lining; such rings serve also to strengthen the sleeves and to locate and retain the linings in the sleeves.
  • the inlet sleeve should preferably be formed with one or more axial slits in its surface at the end which extends into the kiln; this will allow for expansion of the lining at the hot end of the inlet chute nearest the interior of the kiln.
  • the inlet sleeve is conical, its diameter decreasing towards the interior of the kiln. In this way there is less danger of the sleeve becoming jammed in the kiln wall by processed material packing around it.
  • the inlet sleeve be mounted on the kiln in such a way that it can be rotated about its axis to a fresh position, this exposing unworn lining to the abrasion of the material falling from the kiln. In this Way the overall life of the lining can be prolonged. If the sleeve is conical, then such rotation is facilitated.
  • the cooler tubes are normally rigidly mounted on the kiln, and provision for heat expansion must therefore be made in the supply chutes.
  • a suitable expansion joint must be made between the kiln and each cooler tube, or between the kiln and each intermediate sleeve, to allow for expansion of the chute in length as well as in diameter, designed in such away that no material may escape through it. This may be done by incorporating suitable heat resistant packings in the joint.
  • the joint is provided between the kiln and the intermediate sleeve, where material does not accumulate; this is found to be more eflicient than forming the joint at the inlet end of the cooler tube itself.
  • FIG. 1 is a view partly in side elevation and partly in central section of the discharge end of a combined rotary kiln and cooler combination.
  • FIG. 2 is a longitudinal section through part of a rotary kiln, showing an outlet of the kiln, the inlet end of a cooler tube and the chute connecting the outlet with the inlet end of the cooler tube, and
  • FIG. 3 is an enlargement of part of FIG. 2, showing in detail a longitudinal section through the mounting of the inlet sleeve, the connection between the sleeve and the kiln, and the expansion joint.
  • a rotary kiln 11 comprises a shell 12 and a refractory brick lining 13.
  • One outlet from the kiln is shown through a flanged pipe stud 14.
  • the outlet through the pipe stud 14 leads to a cooler tube 15 through a supply chute 16, comprising an inlet sleeve 17 having a monolithic ceramic lining 18 and an intermediate sleeve 19 having a monolithic ceramic lining 20.
  • the cooler tube 15 is provided with a refractory brick lining 21.
  • the ceramic lining 18 is held in position in the inlet sleeve 17 by means of annular steel rings 22 in the ends of the sleeve, these rings protecting the ends of the ceramic lining from impact on them of the material in the kiln.
  • the sleeve 17 has a flange 23 (FIG. 3) and is held in position in the pipe stud 14 by a ring 24 bolted to the stud; it is also formed with longitudinal slits 26 to allow for expansion of the lining nearest the interior of the kiln.
  • An expansion joint is provided by means of a sealing ring with grooves 27 and 28, in which heat resistant packing material 29 is embedded, thus allowing for longitudinal or diametric expansion of the intermediate sleeve.
  • the material passing into the chute hits the walls of the chute, generally in one specific area, but the ceramic linings 18 and 20 resist the abrasive effect of the hot material.
  • the inlet sleeve 17 recessed in the pipe stud 14 is tapered towards the interior of the kiln, it is easily detachable, even when the space between the sleeve and the brick lining 13 or between the sleeve and the pipe stud 14 is filled with dust. Consequently, the sleeve 17 may be loosened and turned about its own axis so that the wear on the lining 18 may be distributed over the whole of the circumference. The whole sleeve 17 with lining 18 may also be replaced completely in one operation.
  • Such of the two rings 22 as are flush with the kiln lining 13 may be equipped with a transverse rib (not shown) serving to prevent clinker lumps too big from passing into the supply chute 16.
  • a rotary kiln of the type having a number of cylindrical cooler tubes mounted around the outlet end of the kiln with their axes parallel or substantially parallel to the axis of the kiln and the inlet end of each cooler tube connected to an outlet of the rotary kiln by a supply chute
  • the improvement in combination therewith comprising an inlet end of each supply chute formed by a flanged sleeve having a heat-resistant lining, the sleeve being inserted from the outside of the kiln into an outlet in the wall of the kiln and extending through the kiln shell to the interior surface of the kiln lining, the inlet sleeve being conical and the lining thereof being in the form of a monolithic conical tube of ceramic.
  • a supply chute comprising an inlet sleeve and an intermediate sleeve, each of said sleeves being of steel, the inlet sleeve being inserted from the outside of the kiln into an outlet in the wall of the kiln and extending through the kiln shell to the interior surface of the kiln lining, the lining for said supply chute being formed of several ring-like sections of ceramic packed one on top of another in the two sleeves.
  • a kiln according to claim 2 in which an expansion joint is provided between the kiln and the intermediate sleeve.
  • a rotary kiln of the type having a number of cylindrical cooler tubes mounted around the outlet end of the kiln with their axes parallel or substantially parallel to the axis of the kiln and the inlet end of each cooler tube connected to an outlet of the rotary kiln by a supply chute
  • the improvement in combination therewith comprising an inlet end of each supply chute formed by a flanged sleeve having a heat-resistant lining, the sleeve being inserted from the outside of the kiln into an outlet in the wall of the kiln and extending through the kiln shell to the interior surface of the kiln lining, the sleeve lining being protected and located and retained in the sleeve by annular steel rings.
  • a rotary kiln of the type having a number of cylindrical cooler tubes mounted around the outlet end of the kiln with their axes parallel or substantially parallel to the axis of the kiln and the inlet end of each cooler tube connected to an outlet of the rotary kiln by a supply chute
  • the improvement in combination therewith comprising an inlet end of each supply chute formed by a flanged sleeve having a heat-resistant lining, the sleeve being inserted from the outside of the kiln into an outlet in the wall of the kiln and extending through the kiln shell to the interior surface of the kiln lining, the sleeve being formed with one or more axial slits in its surface at the end which extends into the kiln.
  • a rotary kiln of the type having a number of cylindrical cooler tubes mounted around the outlet end of the kiln with their axes parallel or substantially parallel to the axis of the kiln and the inlet end of each cooler tube connected to an outlet of the rotary kiln by a supply chute
  • the improvement in combination therewith comprising an inlet end of each supply chute formed by a flanged sleeve having a heat-resistant lining, the sleeve being inserted from the outside of the kiln into an outlet in the wall of the kiln and extending through the kiln shell to the interior surface of the kiln lining, the inlet sleeve being conical and so mounted in the kiln that it can be rotated about its axis to a fresh position.

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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)
US729275A 1967-05-17 1968-05-15 Coolers for rotary kilns Expired - Lifetime US3502311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22877/67A GB1142119A (en) 1967-05-17 1967-05-17 Rotary kiln

Publications (1)

Publication Number Publication Date
US3502311A true US3502311A (en) 1970-03-24

Family

ID=10186480

Family Applications (1)

Application Number Title Priority Date Filing Date
US729275A Expired - Lifetime US3502311A (en) 1967-05-17 1968-05-15 Coolers for rotary kilns

Country Status (8)

Country Link
US (1) US3502311A (en:Method)
BE (1) BE715331A (en:Method)
DE (1) DE1758343B2 (en:Method)
ES (1) ES353926A1 (en:Method)
FR (1) FR1563519A (en:Method)
GB (1) GB1142119A (en:Method)
NL (1) NL6806662A (en:Method)
SE (1) SE328091B (en:Method)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2218693A1 (de) * 1971-04-19 1972-10-26 F.L. Smidth & Co. A/S, Kopenhagen Verfahren zum Anbringen von Planetenkühlerrohren an einen Drehrohrofen und ein solcher Ofen
US3790335A (en) * 1971-04-08 1974-02-05 Smidth & Co As F L Lined coolers for rotary kilns
US3844709A (en) * 1973-01-03 1974-10-29 Fives Cail Babcock Rotary kiln with cooling cells
US3994677A (en) * 1974-04-17 1976-11-30 Polysius Ag Rotary kiln with planetary coolers
US4036583A (en) * 1975-01-16 1977-07-19 Foret, S. A. Rotary furnace for the continuous manufacture of solid alkaline silicates
US4545763A (en) * 1982-11-26 1985-10-08 Oy Partek Ab Inlet for a cooler in a rotary furnace
CN107883761A (zh) * 2017-12-06 2018-04-06 江苏凤谷节能科技有限公司 回转窑内胆结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK151156C (da) * 1973-01-03 1988-05-02 Fives Cail Babcock Roterovn med planetariske koelerroer
DE10238130A1 (de) * 2002-08-21 2004-03-04 Khd Humboldt Wedag Ag Anlage zur Herstellung von Zementklinker aus Rohmehl

Citations (3)

* 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
US1653050A (en) * 1925-11-19 1927-12-20 Smidth & Co As F L Rotary kiln and cooler
US2845259A (en) * 1954-10-07 1958-07-29 Smidth & Co As F L Combined kiln and cooler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1653050A (en) * 1925-11-19 1927-12-20 Smidth & Co As F L Rotary kiln and cooler
US1652168A (en) * 1925-12-07 1927-12-13 Smidth & Co As F L Rotary kiln and cooler
US2845259A (en) * 1954-10-07 1958-07-29 Smidth & Co As F L Combined kiln and cooler

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790335A (en) * 1971-04-08 1974-02-05 Smidth & Co As F L Lined coolers for rotary kilns
DE2218693A1 (de) * 1971-04-19 1972-10-26 F.L. Smidth & Co. A/S, Kopenhagen Verfahren zum Anbringen von Planetenkühlerrohren an einen Drehrohrofen und ein solcher Ofen
US3844709A (en) * 1973-01-03 1974-10-29 Fives Cail Babcock Rotary kiln with cooling cells
US3994677A (en) * 1974-04-17 1976-11-30 Polysius Ag Rotary kiln with planetary coolers
US4036583A (en) * 1975-01-16 1977-07-19 Foret, S. A. Rotary furnace for the continuous manufacture of solid alkaline silicates
US4545763A (en) * 1982-11-26 1985-10-08 Oy Partek Ab Inlet for a cooler in a rotary furnace
CN107883761A (zh) * 2017-12-06 2018-04-06 江苏凤谷节能科技有限公司 回转窑内胆结构

Also Published As

Publication number Publication date
ES353926A1 (es) 1969-10-16
SE328091B (en:Method) 1970-09-07
DE1758343B2 (de) 1974-05-02
DE1758343A1 (de) 1971-01-07
GB1142119A (en) 1969-02-05
BE715331A (en:Method) 1968-11-18
NL6806662A (en:Method) 1968-11-18
FR1563519A (en:Method) 1969-04-11

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