EP0263404A1 - Rotierender Ofen - Google Patents

Rotierender Ofen Download PDF

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Publication number
EP0263404A1
EP0263404A1 EP87114174A EP87114174A EP0263404A1 EP 0263404 A1 EP0263404 A1 EP 0263404A1 EP 87114174 A EP87114174 A EP 87114174A EP 87114174 A EP87114174 A EP 87114174A EP 0263404 A1 EP0263404 A1 EP 0263404A1
Authority
EP
European Patent Office
Prior art keywords
bricks
fire
rotary kiln
tires
shell
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.)
Granted
Application number
EP87114174A
Other languages
English (en)
French (fr)
Other versions
EP0263404B1 (de
Inventor
Ryusuke Setaka
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.)
Nihon Cement Co Ltd
Original Assignee
Nihon Cement Co Ltd
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
Priority claimed from JP23288086A external-priority patent/JPH0765851B2/ja
Priority claimed from JP24098586A external-priority patent/JPH0765852B2/ja
Application filed by Nihon Cement Co Ltd filed Critical Nihon Cement Co Ltd
Priority to AT87114174T priority Critical patent/ATE73925T1/de
Publication of EP0263404A1 publication Critical patent/EP0263404A1/de
Application granted granted Critical
Publication of EP0263404B1 publication Critical patent/EP0263404B1/de
Expired legal-status Critical Current

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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
    • F27B7/28—Arrangements of linings
    • 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
    • F27B7/22—Rotary drums; Supports therefor
    • F27B7/2206—Bearing rings
    • 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
    • F27B7/22—Rotary drums; Supports therefor
    • F27B2007/2246—Support rollers

Definitions

  • the present invention relates to the burning of a cement, more particularly to a rotary kiln which is constituted so as to prevent the mechanical breakage of the rotary kiln itself from occurring easily at a firing time of an operation beginnig.
  • a rotary kiln is provied with one shell a , fire bricks b with which the shell a is lined, and 3 or 4 ring-like tires c disposed at certain intervals around the outer periphery of the shell a .
  • the thus constituted rotary kiln is supported on a pair of rollers d .
  • Strip-shaped iron plates e which are called supporting blocks are loosely interposed between the shell and the tires. In other words, the shell is slidingly brought into contact with the tires with the interposition of these supporting blocks e .
  • the inner diameter of the tires must be designed to be a little larger than the outer diameter of the rotary kiln, taking a thermal expansion due to a temperature difference into consideration, when it is intended to obtain the suitable creep of the kiln by bringing the supporting blocks into contact with the tires in a lower portion and separating the supporting blocks from the tires in an upper portion of the kiln even at a high temperature at which the rotary kiln is driven as well as at ordinary temperature.
  • an allowable degree of the inner diameter of the tires is limited.
  • a fuel is burnt at a feed rate of 1.0 to 2.0 kiloliter per hour (in terms of heavy oil) for a period of 24 to 72 hours in order to preheat the rotary kiln and its ancillary parts to an enough degree.
  • Fig. 1 shows a relation between the creep of the kiln and a time in the case that the preheating is carried out for 48 hours. As understood from this drawing, the mechanical breakage of the rotary kiln does not take place, in so far as the above-mentioned way is exmployed.
  • Fig. 2 shows a 6 hours' preheatinng process.
  • the rotary kiln is driven discontinuously and the preheating process is simultaneously carried out after the firing, and during this period, the creep of the kiln decreases continuously (see the dotted line in Fig. 2).
  • coating does not adhere sufficiently to the burning sections for a period of 1 to 2 hours.
  • the present inventors have found that the remarkable decrease in the creep of the kiln which occurs in a specific time zone alone after the firing can be eliminated by improving the structure of the bricks, and the present invention has been completed on the basis of this knowledge.
  • an object of the present invention is to provide a rotary kiln in which each brick comprises the combination of a fire insulating brick and a fire brick, and a shell is lined with the bricks at positions corresponding to tires-arranging portions of the rotary kiln so that the fire insulating bricks may face to the inside of a kiln furnace and so that the fire bricks may face to the side of the shell.
  • Another object of the present invention is to provide a rotary kiln in which fire bricks with which a shell is lined at positions corresponding to tires-arraging portions of the rotary kiln are coated, on their surfaces facing to the inside of a kiln furnace, with a fire insulating castable material.
  • Still another object of the present invention is to provide bricks for a rotary kiln which comprises the combination of fire insulating bricks and fire bricks.
  • a further object of the present invention is to provide bricks for a rotary kiln in which fire bricks are coated, on their free surfaces, with a fire insulating castable material.
  • a brick 3 comprises the combination of a fire insulating brick portion 1 having a thickness of 15 to 75 mm and a fire brick portion 2 having a thickness of 200 to 230 mm.
  • the fire insulating brick portion 1 has, for example, a refractoriness of SK 40 or more and a thermal conductivity of 0.6 to 1.2 cal/mhr°C
  • the fire brick portion 2 has, for example, a refractoriness of SK 40 or more and a thermal conductivity of 1.8 to 2.4 cal/mhr°C.
  • a shell of a rotary kiln is lined with these combined bricks, and in this case, it is most effective that the combined bricks are disposed at positions on the shell corresponding to tires-arranging portions for supporting the rotary kiln, particularly at shell positions corresponding to tire portions in burning sections of the rotary kiln.
  • the disposition of the combined bricks on the shell is carried out so that fire insulating bricks 1 may face to the inside of the rotary kiln and so that fire bricks 2 may face to the side of the kiln shell. If the relation of this disposition is inversely taken, the fire insulating brick will be easily broken during the operation of the rotary kiln because of a poor strength, which fact leads to the peeling of all the combined bricks disadvantageously.
  • an excessive heat at the time of firing can be shut out, so that a creep of the kiln can be prevented from extremely decreasing until coating has adhered sufficiently to the tires-arranging portions in the rotary kiln.
  • the combined bricks are disposed on the shell positions corresponding to the tires-arranging portions in an ordinary manner, so that a desired effect can be obtained.
  • these combined bricks may be disposed at different positions than the tires-arranging portions. If such a disposition is employed, an initial heat spoiling at the firing can be inhibited conveniently, which fact is effective to prolong a lifetime of the bricks.
  • a castable material used in the present invention is a kind of monolithic refractories.
  • a fire insulating castable material means a castable material having a smaller thermal conductivity than the fire bricks to be coated.
  • the fire bricks with that the shell is lined are coated with the fire insulating castable material
  • the fire bricks 5 having a refractoriness of SK 40 or more are coated with the fire insulating castable material 4 having a refractoriness of 1,800°C.
  • the most effective positions where the fire insulating castable materials are arranged are positions on the shell corresponding to tires portions for supporting the rotary kiln, particularly positions corresponding to tires-arranging portions in burning sections of the rotary kiln, and positions which are 2 to 3 meters away forward and backward from the centers of the tire portions.
  • the excessive heat at the firing can be shut out, so that the creep of the kiln can be prevented from extremely decreasing until the coating has adhered sufficiently to the tires-arranging portions in the rotary kiln. After this time section has elapsed, the coating adheres thereto and the creep of the kiln is kept in a normal state. Therefore, in the event that the fire insulating brick is broken afterward, any serious trouble will not take place, since the tires have already been heated and expanded.
  • the operation of coating the bricks with the fire insulating castable material may be carried out by blowing or casting the fire insulating castable material 4 all over the surfaces of the fire bricks 5 with which the shell portions corresponding to the tires-arranging portions are lined in an ordinary manner.
  • This operation permits obtaining the desired effect, but it is also possible to coat other portions than the tires-arranging portions with this fire insulating castable material. In such a case, an initial heat spoiling at the firing can be inhibited conveniently, which fact is effective to prolong a lifetime of the bricks. Further, as shown in Figs.
  • the preheating period of time of from firing to main burning can be shortened remarkably, so that an energy loss necessary for the preheating can be decreased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP19870114174 1986-09-30 1987-09-29 Rotierender Ofen Expired EP0263404B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114174T ATE73925T1 (de) 1986-09-30 1987-09-29 Rotierender ofen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP232880/86 1986-09-30
JP23288086A JPH0765851B2 (ja) 1986-09-30 1986-09-30 ロ−タリ−キルン
JP24098586A JPH0765852B2 (ja) 1986-10-09 1986-10-09 ロ−タリ−キルン
JP240985/86 1986-10-09

Publications (2)

Publication Number Publication Date
EP0263404A1 true EP0263404A1 (de) 1988-04-13
EP0263404B1 EP0263404B1 (de) 1992-03-18

Family

ID=26530717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870114174 Expired EP0263404B1 (de) 1986-09-30 1987-09-29 Rotierender Ofen

Country Status (2)

Country Link
EP (1) EP0263404B1 (de)
DE (1) DE3777520D1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357939A2 (de) * 1988-09-09 1990-03-14 VEBA OEL Technologie und Automatisierung GmbH Drehrohr
CN102183151A (zh) * 2011-03-15 2011-09-14 江苏华信达特钢科技有限公司 预热器旋风筒内筒及其制备方法和其专用陶瓷挂片
CN102278891A (zh) * 2011-08-18 2011-12-14 江苏华信达特钢科技有限公司 具有超强型耐热钢钢带的预热器旋筒风筒内筒
CN106352695A (zh) * 2016-09-08 2017-01-25 通达耐火技术股份有限公司 一种回转窑节能的方法
US11479317B2 (en) * 2019-07-10 2022-10-25 Honda Motor Co., Ltd. Straddle ride electric vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633347A (en) * 1951-05-01 1953-03-31 Good Shepherd Home Rotary internally-fired kiln
FR1557822A (de) * 1967-12-22 1969-02-21

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633347A (en) * 1951-05-01 1953-03-31 Good Shepherd Home Rotary internally-fired kiln
FR1557822A (de) * 1967-12-22 1969-02-21

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357939A2 (de) * 1988-09-09 1990-03-14 VEBA OEL Technologie und Automatisierung GmbH Drehrohr
EP0357939A3 (de) * 1988-09-09 1991-01-09 VEBA OEL Technologie und Automatisierung GmbH Drehrohr
CN102183151A (zh) * 2011-03-15 2011-09-14 江苏华信达特钢科技有限公司 预热器旋风筒内筒及其制备方法和其专用陶瓷挂片
CN102278891A (zh) * 2011-08-18 2011-12-14 江苏华信达特钢科技有限公司 具有超强型耐热钢钢带的预热器旋筒风筒内筒
CN102278891B (zh) * 2011-08-18 2012-12-19 江苏华信达特钢科技有限公司 具有超强型耐热钢钢带的预热器旋风筒内筒
CN106352695A (zh) * 2016-09-08 2017-01-25 通达耐火技术股份有限公司 一种回转窑节能的方法
US11479317B2 (en) * 2019-07-10 2022-10-25 Honda Motor Co., Ltd. Straddle ride electric vehicle

Also Published As

Publication number Publication date
EP0263404B1 (de) 1992-03-18
DE3777520D1 (de) 1992-04-23

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