US3618915A - Rotary furnace - Google Patents

Rotary furnace Download PDF

Info

Publication number
US3618915A
US3618915A US55634A US3618915DA US3618915A US 3618915 A US3618915 A US 3618915A US 55634 A US55634 A US 55634A US 3618915D A US3618915D A US 3618915DA US 3618915 A US3618915 A US 3618915A
Authority
US
United States
Prior art keywords
tubular furnace
rotary tubular
furnace
conical
conical pipe
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.)
Expired - Lifetime
Application number
US55634A
Other languages
English (en)
Inventor
Otto Heinemann
Werner Schobler
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Polysius AG
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
Application filed by Polysius AG filed Critical Polysius AG
Application granted granted Critical
Publication of US3618915A publication Critical patent/US3618915A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D11/00—Heat-exchange apparatus employing moving conduits
    • F28D11/02—Heat-exchange apparatus employing moving conduits the movement being rotary, e.g. performed by a drum or roller
    • F28D11/04—Heat-exchange apparatus employing moving conduits the movement being rotary, e.g. performed by a drum or roller performed by a tube or a bundle of tubes
    • 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

  • This invention relates to rotary tubular furnaces and more particularly to such furnaces having cooling passages from the outlet for cooling the furnace charge.
  • rotary tubular furnaces have been provided with a plurality of cooling passages disposed in satellite relationship on the periphery of the furnace tube shell. These passages have been of a conical form expanded in the direction of material flow and have been connected to the outlet of the rotary tubular furnace by feedpipes.
  • rotary tubular furnaces are provided with a plurality of cooling pipes wherein each cooling pipe comprises at least two conical pipe portions disposed in axial sequence and offset in parallel from each other by at least the difference between the major and minor cone radii.
  • the object of the invention is to form the cooler for a rotary tubular furnace of the type mentioned in such manner that the period spent by the material in the cooling pipes is sufiicient for intensive cooling.
  • This type of cooling pipe construction in accordance with the invention means that a single straight line inclined towards the cooling pipe outlet or a step dropping towards the outlet is only formed at the transition or connecting points between the individual conical pipe portions during part of each rotation of the rotary tubular furnace. During the remaining part of each rotation however, steps rising towards the outlets are present between the succeeding individual conical pipe portions. In this manner the movement of the material through the cooling pipe is retarded during a considerable part of the rotation of the tubular furnace, and only favored once during each rotation. In this manner the desired prolongation of the period spent by the material in the cooling pipes is achieved.
  • the desired duration can be influenced by the choice of a suitable axially parallel offsetting of the conical pipe portions. In this manner it is possible to adapt to the particular objective for which the furnace is used.
  • the conical inclination of the conical pipe portions should be at least twice as great asthe inclination of the rotary furnace, and preferably twice to four times as great.
  • FIG. 1 is a schematic longitudinal view of a first embodiment according to the invention
  • FIG. 2 is a cross section of the line II-II of FIG. 1;
  • FIG. 3 is a schematic longitudinal view of a slightly altered second embodiment
  • FIGS. 4-7 are schematic longitudinal view and cross sections of two further embodiments of the invention.
  • FIGS. 1 and 2 show a rotary tubular furnace 1 whose cooler comprises a number of cooling pipes 2, 3, 4 and 5 disposed in satellite manner on the periphery of and extending back along the length of the rotary furnace, these pipes being conically expanded in the direction of material flow (arrow 6).
  • the inlets of the cooling pipes are connected to the outlet 11 of the rotary furnace l by means of feedpipes 7, 8, 9, 10.
  • Each of the cooling pipes 2, 3, 4 and 5 shown in the drawing consists of three conical pipe portions 2a-2c, Sal-3c, 4a-4cand 5a-5c disposed in axial sequence,said portions being in this embodiment axially parallel offset from each other by the difference between the major and minor cone radii, wherein the conical inclination S of all the pipe portions (e.g. 3a) is at least twice the inclination S of the rotary furnace 1 relative to the horizontal H.
  • the end faces of the conical pipe portions lie in planes which run perpendicular to the longitudinal axes of the corresponding pipe portions.
  • the axes of the conical pipe portions 2a-5c of all the cooling pipes 2-5 lie on an imaginary cylindrical surface 12 concentric with the rotary furnace 1.
  • This furnace l is surrounded by an annular outlet housing 13 wherein terminate the outlet ends of all the cooling pipes 2-5.
  • the outlet sides of the cooling pipes are thus directed towards the inlet end of the rotary furnace l, which also contributes to the spatial economy of the furnace construction. While the cooling pipe 2-5 are fixedly attached to the rotary furnace l, the common outlet housing 13 can be made stationary.
  • the heated material from the furnace outlet moves for the purpose of cooling through the feedpipes 7-10 into the inlets of the cooling pipes 2-5 which constitute the cooler. Due to the rotary movement of the furnace l and the sufficiently large'conical inclination S of the individual pipe portions 2a 5c, the material is fed in each conical pipe portion to the end face with the large diameter.
  • the passage of material from one conical pipe portion e.g. with the index letter a to the next (e.g. with the reference letter b) is either favored or else hindered to a greater or lesser degree, depending on the rotational position of the furnace 1.
  • FIG. 3 shows a form of the invention slightly varied from the first embodiment.
  • the cooling pipes 15, 16 and 17 are disposed in this case exactly as in the first embodiment.
  • the difference lies in the construction of the pipes themselves. They consist of conical pipe portions whereof those end faces do not terminate in the outlet housing 13 lie in planes which run obliquely to the longitudinal axis of the corresponding pipe portion. This means that there is an obtuse angle between the main surface and the end face at the points in the individual pipe portions where the major part of the material is held up (i.e. at the points where the step is highest).
  • This simple construction provided by the invention prevents agglomerations of material at positions where this is a special danger.
  • the cooling pipes 18, 19, 20 and 21 of the rotary tubular furnace 1 shown in FIGS. 4 and 5 differ slightly in shape from those seen in FIGS. 1 and 2, in that the conical pipe portions are axially parallel and offset by approximately the size of the minor diameter of the cone. Since particularly large steps are produced in this way, this embodiment is most generally chosen when the material is required to stay an especially long time in the cooling pipes.
  • conical portions 22, 23 and 24 of the cooling pipes are offset by so much (i.e. by about the total of the major and minor cone radii) that transition pieces, preferably conical( (e.g. 25 and 26) are provided between the individual pipe portions, and also chutes (e.g 27 and 28) dropping in the direction of feed.
  • This embodiment also provides a particularly long cooling path in the individual cooling pipes, with effective use of the space available at the periphery of the rotary furnace.
  • a rotary tubular furnace with a cooler comprising a number of cooling pipes disposed in satellite manner on the periphery of the tubular furnace, said pipes conically widening in the direction of material flow, and having their inlet connected by a feedpipe to the outlet of the rotary tubular furnace, characterized in that each cooling pipe comprises at least two conical pipe portions disposed in axial sequence and having their axes offset in parallel from each other by at least the difierence between the major and minor cone radii.
  • a rotary tubular furnace as in claim 1 characterized in that the axes of the conical pipe portions of all the cooling pipes lie on the surface of an imaginary cylinder concentric with the rotary tubular furnace.
  • a rotary tubular furnace as in claim 1 wherein said cooling pipes have outlets in an annular array around the axis of said furnace and including a common annular outlet housing surrounding the rotary tubular furnace concentric with the outlets of the cooling pipes.
  • a rotary tubular furnace as in claim 1 characterized in that each end face of a conical pipe portion lies in a plane running perpendicularly to the longitudinal axis of the pipe portion.
  • a rotary tubular furnace as in claim 1 characterized in that at least some end faces of the conical pipe portions lie in planes which are parallel to each other and inclined to the longitudinal axis of the conical pipe portions.
  • a tubular furnace as in claim I characterized in that the conical pipe portions are axially parallel and offset from each other by at least the total of the major and minor cone radii, and in that conical transition pieces are provided at the connection points between the conical pipe portions, together with chutes inclined in the direction of feed of the material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
US55634A 1969-08-22 1970-07-17 Rotary furnace Expired - Lifetime US3618915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691942840 DE1942840B2 (de) 1969-08-22 1969-08-22 Drehrohrofen mit kuehler

Publications (1)

Publication Number Publication Date
US3618915A true US3618915A (en) 1971-11-09

Family

ID=5743548

Family Applications (1)

Application Number Title Priority Date Filing Date
US55634A Expired - Lifetime US3618915A (en) 1969-08-22 1970-07-17 Rotary furnace

Country Status (6)

Country Link
US (1) US3618915A (de)
JP (1) JPS4828175B1 (de)
DE (1) DE1942840B2 (de)
DK (1) DK124150B (de)
FR (1) FR2058915A5 (de)
GB (1) GB1262220A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120225394A1 (en) * 2009-08-26 2012-09-06 Heinrich Auberger Delivery chute for sinter material
US20170072766A1 (en) * 2015-09-11 2017-03-16 Denso International America, Inc. Air conditioning system having cylindrical heat exchangers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049382A1 (de) 2004-10-08 2006-04-13 Rheinmetall Defence Electronics Gmbh Sensormodul zur Treffererfassung für Gefechtsfeldsimulationen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120225394A1 (en) * 2009-08-26 2012-09-06 Heinrich Auberger Delivery chute for sinter material
US8876526B2 (en) * 2009-08-26 2014-11-04 Siemens Vai Metals Technologies Gmbh Delivery chute for sinter material
US20170072766A1 (en) * 2015-09-11 2017-03-16 Denso International America, Inc. Air conditioning system having cylindrical heat exchangers
US10086674B2 (en) * 2015-09-11 2018-10-02 Denso International America, Inc. Air conditioning system having cylindrical heat exchangers

Also Published As

Publication number Publication date
DK124150B (da) 1972-09-18
DE1942840B2 (de) 1971-09-02
DE1942840A1 (de) 1971-04-15
JPS4828175B1 (de) 1973-08-30
FR2058915A5 (de) 1971-05-28
GB1262220A (en) 1972-02-02

Similar Documents

Publication Publication Date Title
US4699211A (en) Segmental baffle high performance shell and tube heat exchanger
US3788188A (en) Combination muzzle-loading mortar barrel and projectile
US3618915A (en) Rotary furnace
US4791984A (en) Heat transfer fin
US4562767A (en) Muzzle recoil dampener
US4037539A (en) Spiral channel blast-fragment warhead
US2001258A (en) Rotary kiln and cooler
US3350084A (en) Tuyere with divided passageway
US3627296A (en) Cooled blow mold for industrial furnaces particularly blast furnaces
US3643364A (en) Rifled gun barrel with the interior cross-sectional configuration defining a regular curvilinear polygon
EP0117820A1 (de) Segmentlenkbleche für einen Hochleistungs-Mantel-mit-Rohren-Wärmetauscher
US3813211A (en) Cooler tubes for rotary kiln
US4596286A (en) Rotary processor
US3372915A (en) Rotary kiln assemblies
US3920381A (en) Rotary furnace having a planetary cooler
US3616562A (en) Gun-barrel rifling
US4089634A (en) Planetary cooler system for rotary kiln plant and the like
US2904322A (en) Arrangement for discharge of material from rotary kilns
US3751217A (en) Rotary kiln precooler construction
US2728146A (en) Rotary heat exchanger
US3811824A (en) Cooler tubes for rotary kiln
SU573132A3 (ru) Рекуператорный холодильник вращающейс печи
US3643933A (en) Cooler for rotary kiln
GB1136286A (en) Method of and apparatus for the manufacture of heat exchanger assemblies
JPS6321500A (ja) 口径より小さい胴径をもつ発射体