[go: up one dir, main page]

US3298110A - Apparatus for the preheating of raw cement material - Google Patents

Apparatus for the preheating of raw cement material Download PDF

Info

Publication number
US3298110A
US3298110A US331250A US33125063A US3298110A US 3298110 A US3298110 A US 3298110A US 331250 A US331250 A US 331250A US 33125063 A US33125063 A US 33125063A US 3298110 A US3298110 A US 3298110A
Authority
US
United States
Prior art keywords
separators
chambers
hot gas
duct
eddy
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
US331250A
Other languages
English (en)
Inventor
Kus Rudolf
Jager Heinz
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.)
Wedag Westfalia Dinnendahl Groeppel AG
Original Assignee
Wedag Westfalia Dinnendahl Groeppel 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 Wedag Westfalia Dinnendahl Groeppel AG filed Critical Wedag Westfalia Dinnendahl Groeppel AG
Application granted granted Critical
Publication of US3298110A publication Critical patent/US3298110A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 specially adapted for rotary-drum furnaces
    • F27B7/2016—Arrangements of preheating devices for the charge
    • F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones

Definitions

  • This invention relates to apparatus for the preheating of pulverulent raw cement material, and more particularly to such apparatus having a number of cyclone separators mounted in tandem and which may be mounted in stages one above the other, the separators being traversed in sequence by the hot exhaust gases of a furnace, particularly of a rotary kiln, in countercur-rent flow to the direction of travel of the charged raw material.
  • Hot gas ducts having substantially vertical sections interconnect the cyclone separators.
  • Still another object of the invention is to provide a plurality of easily cleanable eddy chambers which can be observed in operation.
  • the hot gas duct means which interconnect the kiln with the lowermost or first cyclone separator are provided with eddy chambers, and at least some of the cyclones are interconnected by means of an upwardly extending hot gas duct means having eddy chambers.
  • These chambers are provided in a vertical portion of the hot gas duct means and comprise a plurality of vertical superimposed downwardly tapered heat-exchange stages.
  • each of such hot gas ducts comprise a plurality of superimposed stages, having downwardly and inwardly tapered sides and being of a frusto-conical shape or in the form of a truncated cone, tapering downwardly, thus forming a plurality of superimposed frusto-conic-al chambers.
  • the lateral extending portion of each of the chambers is sealed off in an upward direction by means of an annular cover.
  • the pulverulent material to be preheated is supplied in a conventional manner to the series of cyclones, and is then fed from the discharge of a cyclone separator to the lowermost of the superimposed stages.
  • the stages thus form a superimposed series of heat-exchange eddy chambers which are traversed by the hot gases flowing upwardly from below so as to bring the gases into intimate and relatively long contact with the downwardly flowing raw material.
  • the annular covers of the eddy chambers are provided with peep-holes or apertures.
  • removable lids may be provided so that the apertures may be employed for cleaning of the inner walls of the eddy chambers.
  • FIG. 1 is an elevation view showing the upper portion of a rotary cement kiln and the lower portion of a series of cyclone separators and other apparatus arranged according to the invention.
  • FIG. 2 is a vertical cross section of a portion of FIG. 1 and illustrates a series of superimposed stages of the hot gas duct.
  • a rotary furnace or kiln 1 is fed by powdered raw cement material from a feed pipe 4 and from a feed pipe 8, the latter passing via duct 2.
  • Hot exhaust gases issue from the rotary kiln 1 and fiow generally upwardly through the duct 2.
  • the hot gas duct 2 carrying the exhaust gases is connected at its outlet 2a tangentially into the cyclone separator 3, which is first in a series of separators along the flow path of the hot exhaust gas.
  • the discharge pipe 4 connected to the bottom of this cyclone 3 conveys the raw material and the dust separated out in cyclone 3 down into the rotary kiln 1, while the exhaust duct 5 leading from the head 6 of cyclone separator 3 links up tangentially with cyclone separator 7, next ensuing in the series.
  • the discharge pipe 8 of this cyclone 7 leads downwardly into the lowermost stage of a plurality of superimposed stages or contact chambers 9 which are lodged within a vertical portion of the hot gas duct 2 and which will be described presently.
  • the hot gas duct 2 leading from the top of cyclone separator 7 may also be provided with a series of vertically superimposed eddy chambers 9 similar to those illustrated in FIG. 2 and described herein relative to exhaust duct 2.
  • the exhaust gases from. duct 2' after leaving such eddy chambers can be directed by means of an outlet pipe connected into a further dust separator (not illustrated) similar to the connection at 2a.
  • FIG. 2 illustrates, in enlarged cross section, the superimposed stages or eddy chambers 9 of the hot gas duct 2.
  • the side walls 9a of the chambers are downwardly tapered, so that the diameter of each chamber widens in the upward direction.
  • the walls 9a of the chambers 9 are arranged and shaped so that the chambers are of frusto-conical form, or in the form of a truncated cone whose side walls 9ataper downwardly.
  • Annular covers 10 are provided for each of the chambers 9, and join the upper portion of the walls 9a of a particularchamber 9'to the base of the walls of the next upper chamber, or tothe exhaust pipeoutlet leading from the uppermost chamber 9.
  • the annular covers 10 serve to seal olf the laterally projecting portions of the tops of the respective chambers 9, and are each provided with a number of access openings or apertures 12 which serve as peep-holes and provide access for cleaning the inner walls of the chambers 9.
  • the covers 10 are preferably made to slope outwardly and downwardly as illustrated in FIG. 2 in order to provide easier access for cleaning and better vision for observing the action within the chambers 9.
  • the direction of slope of the cover 10 also directs the flow of gases which impinge upwardly on the bottom of cover 10 in a generally upward direction into the next upper chamber or outlet duct.
  • Removable lids 11 are provided for sealing off the apertures 12.
  • the hot exhaust gases from the rotary kiln 1 flow upwardly through'the exhaust duct 2, through the heatexchange eddy chambers 9, through the outlet 2a of pipe 2 into cyclone separators 3, through head 6 of cyclone 3 into pipe 5 and thence into cyclone separator 7, from which it issues through outlet pipe 2' and continues similarly through exhaust ducts and dust separators until it finally reaches the atmosphere.
  • the hot exhaust gases come into intimate contact with the raw cement pulverulent material flowing downwardly in countercurrent flow to the upwardly flowing gases.
  • the pulverulent material to be heated enters from pipe 8 into the lowermost stage 9 of duct 2, where it comes in contact with the upwardly flowing hot gases.
  • the stages 9 form a superimposed series of eddy chambers which are traversed by the hot gases flowing upwardly from below.
  • An intensive upward flow develops in the constricted areas of the eddy chambers and prevents the material from dropping back into the hot gas pipe 2, or from sinking down to a lower eddy chamber.
  • the larger volume in the upper portion of each of the chambers 9 permits the vertical flow in those chamber portions to be less intensive and provides a space for mixing and for eddy currents to take place, to promote the desired longer duration of contact between the downwardly flowing powder and the upwardly flowing hot gas.
  • the fact that the lower portions of the eddy chambers are constricted serves to produce an intensive flow which securely prevents the formation of floating layers of powder or of dead spaces in the chambers where little or no flow takes place.
  • a preheating apparatus comprising upwardly extending hot gas duct means, a plurality of sequentially arranged interconnected cyclone separators, said duct means .being connected to a first one of said separators, said duct means including a plurality of superimposed downwardly tapered eddy chambers, and discharge means connected to another of said separators and to said duct means for feeding material to be preheated into the lowermost of said eddy chambers.
  • An apparatus for preheating pulverulent raw cementitious material comprising upwardly extending hot gas duct means, a plurality of sequentially arranged serially interconnected cyclone separators each having a hot gas outlet and defining together a flow path for hot gas,
  • said duct means including a plurality of vertically superimposed downwardly tapered frusto-conical eddy chambers, another one of said separators having conduit means connected tangentially thereinto and joined to said hot gas ly interconnected cyclone separators each having a hot gas outlet and defining together a flow path for hot gas, said duct means being connected to one of said separators, said duct means including a plurality of vertically superimposed downwardly tapered frusto-conical eddy chambers, a subsequent one of said separators having conduit means connected tangentially thereinto and joined to said hot gas outlet of said one separator, anddischarge means connected from the bottom of said subsequent one of said separators to said duct means for feeding the cementitious material to be preheated into the lowermost of said eddy chambers, the top portions of said chambers having acce ss openings therein, and removable lids on said chambers for closing said openings.
  • An apparatus for preheating pulverulent raw cement material comprising an upwardly extending hot gas duct, a plurality of tandem arranged serially interconnected cyclone separators each having a hot gas outlet and defining together a flow path for hot gas, said duct being connected to one of said separators, said duct including a plurality of superimposed downwardly tapered truncated conically shaped eddy chambers, a subsequent one of said separators having conduit means connected tangentially thereinto and joined to said hot gas outlet of said lowermost separator, a discharge pipe connected from the bottom of said subsequent one of said separators to the lowermost of said eddy chambers for feeding material to be preheated from said subsequent one of said separators into the lowermost of said eddy chambers, said eddy chambers being provided with annular covers, said eddy chambers having upper laterally projecting portions, said covers sealing said projecting portions.
  • An apparatus for preheating pulverulent raw cement material comprising an upwardly extending hot gas duct, a plurality of tandem arranged serially interconnected cyclone separators each having a hot gas outlet and defining together a flow path for hot gas, said duct being connected to one of said separators, said duct including a plurality of superimposed downwardly tapered truncated conically shaped eddy chambers, a subsequent one of said separators having conduit means connected tangentially thereinto and joined to said hot gas outlet of said lowermost separator, a discharge pipe connected from the bottom of said subsequent one of said separators to the lowermost of said eddy chambers for feeding material to be preheated from said subsequent one of said separators into the lowermost of said eddy chambers, said eddy chambers having provided with annular covers, said eddy chambers having upper laterally projecting portions, said covers sealing said projecting portions, said covers having access openings therein, and removable lids disposed on said covers for closing said openings
  • a preheating apparatus for treating cementitious material comprising upwardly extending hot gas duct means, a plurality of serially interconnected sequentially arranged cyclone separators each having a hot gas outlet and defining together a flow path for hot gas, said duct means being connected to oneof said separators, said duct means including a plurality of verticallysuperimposed downwardly tapered eddy chambers, a subsequent one of said separators having conduit means connected tangentially thereinto and joined to said hot gas outlet of said lowermost separator, a discharge pipe connected from the bottom of said subsequent one of said separators to the lowermost of said eddy chambers for feeding material to be preheated from said subsequent one of said separators into the lowermost of said eddy chambers.
  • An apparatus for preheating pulverulent raw cement material comprising an upwardly extending hot gas duct, means connected to said duct for directing hot gas through said duct, a plurality of serially interconnected cyclone separators each having a hot gas outlet and defining together a flow path for hot gas, said separators being sequentially arranged in tandem relationship, said duct being connected to the lowermost one of said separators, said duct including a plurality of substantially vertically superimposed downwardly tapered frusto-conical eddy 10 one of said separators to the lowermost of said eddy 15 chambers for feeding material to be preheated into the lowermost of said eddy chambers, said eddy chambers having annular covers, said covers having peep-holes therein, and removable lids on said covers for closing said peep-holes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
US331250A 1962-12-20 1963-12-17 Apparatus for the preheating of raw cement material Expired - Lifetime US3298110A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW33571A DE1172181B (de) 1962-12-20 1962-12-20 Einrichtung zum Vorerhitzen von Zementrohmehl

Publications (1)

Publication Number Publication Date
US3298110A true US3298110A (en) 1967-01-17

Family

ID=7600372

Family Applications (1)

Application Number Title Priority Date Filing Date
US331250A Expired - Lifetime US3298110A (en) 1962-12-20 1963-12-17 Apparatus for the preheating of raw cement material

Country Status (5)

Country Link
US (1) US3298110A (de)
CH (1) CH421792A (de)
DE (1) DE1172181B (de)
DK (1) DK112076B (de)
GB (1) GB1047763A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527973A (en) * 1982-12-23 1985-07-09 Ube Industries, Ltd. Precalciner for cement raw meal
US4640682A (en) * 1985-10-03 1987-02-03 Gray Robert R Pulse jet combustor dehydration cone construction
EP0563556A1 (de) * 1992-03-05 1993-10-06 Paul Ensle Stiftung & Co. Kg Vorrichtung zum Mischen von feinkörnigen Materialien und/oder Flüssigkeiten

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538833A (en) * 1947-08-13 1951-01-23 Peter Spence & Sons Ltd Apparatus for drying or calcining materials
US2797077A (en) * 1954-08-07 1957-06-25 Kloeckner Humboldt Deutz Ag Apparatus for preheating kiln-feed material by kiln-exit gases

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT183006B (de) * 1952-12-04 1955-08-25 Kloeckner Humboldt Deutz Ag Einrichtung zum Erhitzen von feinkörnigem Gut, insbesondere von Zementrohmehl
DE1083746B (de) * 1958-03-05 1960-06-15 Polysius Gmbh Einrichtung zum Vorerhitzen von Zementrohmehl oder aehnlichen feinkoernigen festen Stoffen, die anschliessend in einem Brennofen gebrannt oder gesintert werden

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538833A (en) * 1947-08-13 1951-01-23 Peter Spence & Sons Ltd Apparatus for drying or calcining materials
US2797077A (en) * 1954-08-07 1957-06-25 Kloeckner Humboldt Deutz Ag Apparatus for preheating kiln-feed material by kiln-exit gases

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527973A (en) * 1982-12-23 1985-07-09 Ube Industries, Ltd. Precalciner for cement raw meal
US4640682A (en) * 1985-10-03 1987-02-03 Gray Robert R Pulse jet combustor dehydration cone construction
EP0563556A1 (de) * 1992-03-05 1993-10-06 Paul Ensle Stiftung & Co. Kg Vorrichtung zum Mischen von feinkörnigen Materialien und/oder Flüssigkeiten

Also Published As

Publication number Publication date
DE1172181B (de) 1964-06-11
GB1047763A (en) 1966-11-09
DK112076B (da) 1968-11-04
CH421792A (de) 1966-09-30

Similar Documents

Publication Publication Date Title
US3864075A (en) Apparatus for burning granular or pulverous material
US4039277A (en) Apparatus for calcining powder materials
US4094626A (en) Apparatus for producing cement clinker
US3330046A (en) Method and apparatus for exchanging heat between solid particles and gases
US4624636A (en) Two stage material cooler
US4209296A (en) Apparatus and method for the thermal treatment of fine grained material
US3938949A (en) Method and apparatus for burning pulverulent materials
US4078882A (en) Burning of pulverous or granular raw materials
US3207494A (en) Apparatus for the preheating of raw cement material
HU201145B (en) Apparatus for continuous calcinating dustlike materials
US3940241A (en) Rotary kiln plant
CN105236772B (zh) 一种竖窑‑间壁回转窑联合装置
US3298110A (en) Apparatus for the preheating of raw cement material
US4392822A (en) System for burning fine-grained material, particularly for the manufacture of cement clinkers
US2757921A (en) Method for burning of materials with heat recovery
US4522131A (en) Installation for the thermal treatment of pulverulent mineral products
CA1149610A (en) Preheating method and apparatus
US3932116A (en) Method and apparatus for burning pulverulent materials
US2883173A (en) Method and apparatus for preheating finely divided kiln charge with high temperature gases from the kiln
GB2081855A (en) Method and apparatus for heat treating granular material
US3067990A (en) Apparatus for preheating finely divided material
US3498595A (en) Preheating apparatus useful in the manufacture of cement and the like
EP0052431A1 (de) Zementbrennanlage
US3512766A (en) Apparatus for preheating solids
US4521978A (en) Heat exchanger for thermally treating a pulverulent material