US3807552A - Apparatus for cooling and classifying ground material - Google Patents

Apparatus for cooling and classifying ground material Download PDF

Info

Publication number
US3807552A
US3807552A US00887978A US88797869A US3807552A US 3807552 A US3807552 A US 3807552A US 00887978 A US00887978 A US 00887978A US 88797869 A US88797869 A US 88797869A US 3807552 A US3807552 A US 3807552A
Authority
US
United States
Prior art keywords
chamber
air
air stream
primary
primary chamber
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
US00887978A
Other languages
English (en)
Inventor
B Gotthard
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 US3807552A publication Critical patent/US3807552A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

  • ABSTRACT An air separator is provided with an inlet for blowing cooling air into a circulating stream containing separated fines leaving a primary separating chamber and entering a secondary separating chamber. An excess of warm air is extracted through a pipe to maintain the quality of air flowing through the primary chamber Mar. 6, 1969 Germany 1911417 [52] U.S. Cl. 209/11, 209/139 A [51] Int. Cl B07b 7/10 [58] Field of Search 209/3, 11, 139 A, 139 R, 209/133, 134, 136; 34/77; 241/23 [5 6] References Cited UNITED STATES PATENTS 2,657,797 11/1953 Ledgett 209/11 constant.
  • This invention relates to an apparatus for cooling and classifying fine material in an air separator by feeding cool air into the separator and removing warm air from the separator.
  • ground material is often produced at a considerably higher temperature than is required for the finished material, the material must generally be cooled in an air separator.
  • this object is achieved in that the cool air is fed into the separating air stream at a position where at least the majority of the coarse material has already been separated from the separating air stream, which in general is now-only laden with fine material.
  • the cool air is only introduced after the separation of coarse material, i.e., into the separating air stream now in general only-laden with fine material, optimum cooling of the fine material is achieved for a given quantity of cool air.
  • an effective embodiment of the invention is provided by using at least one cool air conduit which enters the separating air flow space on the pressure side of the fan.
  • the fan is consequently not burdened with cooling air, and is fully utilized in circulating the main stream of air.
  • the air passing through the fanthus makes a full contribution to the separating effectjin this manner a greater quantity of separating air than previously is now available, especially for the subsequent separation taking place in the lower part of the separator adjacent the zone where the circulating air re-enters the separating chamber.
  • FIG. 1 is a" schematically shown vertical section through a first air separator embodying the invention
  • FIGS. 2 and 3 are a vertical section and a fragmentary plan view of a further embodiment of an air separator
  • FIGS. 4 and 5 are a vertical section and a fragmentary plan view of a'third embodiment.
  • the air sifter shown in FIG. 1 has an outer separator housing 1 containing a vertical shaft 2 carrying a scatter plate 3 and a fan 4 connected thereto and rotating with the shaft and the scatter plate, and has an inner separator housing 5.
  • the outer housing 1 has a circular cross-section and is closed at the top by a cover 6. At the bottom this housing becomes a collector hopper 7 having an exit pipe 8 for the fine material.
  • the inner housing 5 is dis posed coaxially with the outer separator housing 1. A flow space 9 is formed between the two housings. Adjacent the conically shaped'lower part of housing 5 is a ring of screens 10 connected to the upper edge of a coarse material collector hopper 1 I.
  • the outlet pipe 12 of hopper 11 leads downwardly and passes through the It extends from a drive 15 mounted on the housing cover 6 down into the separator, and is supported in the lower part thereof by radially adjustable struts 16.
  • the scatter plate 3 affixed to shaft 2 is drivingly connected with fan 4 by a hollow shaft 17.
  • the fan is located above the inner housing 5 which contains the actualv separating chamber 18.
  • the hollow shaft 17 of the fan 4 concentrically surrounds the ground material feed pipe 19 which runs coaxially with shaft 2 and ends some distance above scatter plate 3.
  • the feed pipe 19 is connected to a material supply hopper 20 which is adjacent the housing cover 6 and is filled from an inlet pipe 21.
  • On the housing cover 6 are also disposed a number of peripherally distributed cool air inlets 22, 22' which enter the flow space 9 on the pressure side of the fan '4.
  • the air separator shown in FIG. 1 operates as follows: I
  • the air separator is supplied through inlet pipe 21 with ground material, coming for instance from a tube mill, which is to be separated into coarse and fine material.
  • This ground material passes through supply hopper 20 and feed pipe 19 onto scatter plate 3.
  • the latter is set in rotation by drive 15 and shaft 2, and spins the ground material off into the separator chamber 18.
  • the separating air left in the separator flows, under suction effect of fan 4, back into the separating chamber 18 through the screen ring 10.
  • the separating air stream 23 must again pass through the coarse material moving downwards on the inside of the screen ring 10, which causes a further separation of the coarse material. in this manner the air stream supplied by the fan makes a full contribution to the further separation.
  • a further hollow shaft 32 coaxially supported thereon is driven by the drive 27.
  • a pre-distributor plate 33 On the central part of this hollow shaft 32 is mounted a pre-distributor plate 33, and at its lower end is secured the scatter plate 3, which supports a counterblade system 34.
  • a hood is disposed above the scatter plate 3 and around the pre-distributor plate 33. This hood 35 is supported by the supply hopper 20 located beneath the drive 27.
  • the separating chamber 18 is mainly formed by the housing 1 and a cone 36 connected to the housing 1. At the bottom end of the cone 36 is the ring of screens 10, which are spaced directly above the fan 4.
  • the pipes 31, 31' brought together on the suction side of fan 4 and passing through the collector hopper 7 are connected to a common warm air outlet conduit 13.
  • a cool air inlet conduit 37 opens into each inlet pipe 29,-29 (see FIG. 3).
  • the air feed of fine material is returned to the separator through the pipes 31, 31' which lead from the fine material separators 28, 28' to the fan 4; but a certain amount of warm air is first removed via the conduit 13, so that a largely constant amount of separating air can be fed to fan 4.
  • a cool air supply conduit 37 also opens into each of these inlet pipes.
  • the fine material separators 39, 39' are connected via a pipe 40 to a fan 41 lying outside of the housing 1.
  • a warm'air exit pipe 42 is connected to the pipe 40.
  • the pressure side of the fan 41 is connected by a pipe 43 to a space 44 surrounding the screen ring 10.
  • the fine material separators 39, 39' with their material outlets are mounted on the edge of the hopper 7 surrounding the coarse material collector hopper 1 l.
  • the ground material passes through the supply hopper 20 andthe material feed pipe 19 to the scatter plate 3 which distributes it uniformly in the separating chamber 18.
  • the coarse material then passes downwards on the inner wall of the housing, and is removed via the coarse material collector hopper 11 and the outlet pipe
  • the circulating stream of separator air entering from space 44 through the screen ring 10 thus passes twice through the ground material, entraining the fine material, which is separated in the fine material separators 39, 39 vCool air is fed into the mixture of fine material and air as it passes through the pipes 29, 29, so that the fine material'emerging fromthe separators 39, 39' and the hopper 7 leaves the air separator as well-cooled finished material.
  • the excess warm air is removed through the pipe 42. Because of this removal of excess warm air before the fan (see also FIGS. 1 and 2), the latter in general need only be designed for the amount of air needed for separating.
  • the air separators of the last two embodiments also have the special advantage that only clean air impinges on their fans, so that wear effects are largely avoided.
  • the warm air is to be fed to another unit, e.g., to the mill, it can be extracted beyond the fan, so that no blower is needed to overcome the pressure difference.
  • Apparatus for cooling and classifying ground material comprising means defining a primary chamber for separating coarse material from an air stream; means defining a secondary chamber for separating fine material from an air stream, which has an inlet connection leading from the upper portion of the primary chamber into the secondary chamber and an outlet connection leading from the secondary chamber into the lower portion of the primary chamber; an inlet for ground material leading into the upper portion of the primary chamber; a fan arranged to recirculate an air stream upward through the primary chamber into contact with the incoming ground material, through the secondary chamber and back into the lower portion of the primary chamber, causing coarse material to separate by gravity in the primary chamber, and causing fine material to be carried by the air stream into the secondary chamber and there separated from the air stream; wherein the improvement comprises means for introducing, into the recirculating air stream entering the secondary chamber, air which is cooler than such entering air stream; and means for withdrawing air fromthe recirculating air stream leaving the secondary chamber before such air stream again contacts said incoming ground material.
  • Apparatus according to claim 1 wherein the means for withdrawing air is arranged to withdraw air from the air stream leaving the secondary chamber before such air stream enters the fan.
  • Apparatus for cooling and classifying ground material comprising means defining a primary separating chamber, means defining a secondary separating chamber, an inlet connection leading from the upper portion of the primary chamber into the secondary chamber and an outlet connection leading from the secondary chamber into the lower portion of the primary chamber, an inlet for said ground material leading into the upper portion of the primary chamber, a fan constructed and arranged to circulate an air stream upwardly through the primary chamber into contact with the incoming ground material, through the secondary chamber and back into the lower portion of the primary chamber, causing coarse material to separate by gravity in the primary chamber, and causing fine material to be carried by the air stream into the secondary chamber and there separated from the air stream, wherein the improvement comprises means for introducing cooling air into the circulating air stream leaving the primary chamber and entering the secondary chamber, and means for withdrawing an excess of air from said circulating air stream leaving the secondary chamber before such air stream again contacts said incoming ground material to maintain a substantially constant quantity of air flowing through said primary chamber.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Furnace Details (AREA)
US00887978A 1969-03-06 1969-12-24 Apparatus for cooling and classifying ground material Expired - Lifetime US3807552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1911417A DE1911417C3 (de) 1969-03-06 1969-03-06 Umluftsichter

Publications (1)

Publication Number Publication Date
US3807552A true US3807552A (en) 1974-04-30

Family

ID=5727333

Family Applications (1)

Application Number Title Priority Date Filing Date
US00887978A Expired - Lifetime US3807552A (en) 1969-03-06 1969-12-24 Apparatus for cooling and classifying ground material

Country Status (6)

Country Link
US (1) US3807552A (enExample)
JP (1) JPS5322299B1 (enExample)
AT (1) AT314948B (enExample)
DE (1) DE1911417C3 (enExample)
FR (1) FR2033785A5 (enExample)
GB (1) GB1273257A (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528728A1 (fr) * 1982-06-18 1983-12-23 Janich Hans Jurgen Procede d'actionnement d'un appareil de criblage pneumatique et appareil de criblage pour la mise en oeuvre de ce procede
US4661244A (en) * 1985-04-25 1987-04-28 Firma Christian Pfeiffer Rotary basket air classifier
US5180113A (en) * 1990-02-01 1993-01-19 Evt Energie- Und Verfahrenstechnik Gmbh Pulverizing technique and rolling mill for use therein
US20070278706A1 (en) * 2006-05-30 2007-12-06 C. Cretors And Company Cotton candy handling device
US20080271654A1 (en) * 2007-05-01 2008-11-06 Cavaliere William A Methods and Apparatus for Enhanced Incineration
CN103861810A (zh) * 2014-04-02 2014-06-18 徐国安 非金属片状物与环状物的分离器
CN104148286A (zh) * 2014-07-14 2014-11-19 南京西普水泥工程集团有限公司 一种用于辊压机粉磨系统的分选设备

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1931892B2 (de) * 1969-06-24 1979-01-25 Westfalia Dinnendahl Groeppel Ag, 4630 Bochum Umluftsichter zum Kühlen von Zement o.a. Gut
DE2414767A1 (de) * 1974-03-27 1975-10-16 Janich Hans Juergen Umluftsichter mit kuehleinrichtung
DE3410363A1 (de) * 1984-03-21 1985-10-03 Krupp Polysius Ag, 4720 Beckum Umluftsichter
CN110068200B (zh) * 2019-05-07 2020-05-22 中国矿业大学 一种离心流化床干燥分选系统及干燥分选方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1962455A (en) * 1931-01-30 1934-06-12 Henry S Montgomery Air separator
US2790550A (en) * 1954-10-25 1957-04-30 Sturtevant Mill Co Apparatus for centrifugal separation
DE1242993B (de) * 1961-01-27 1967-06-22 Jakob Heyd Umluftsichter

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528728A1 (fr) * 1982-06-18 1983-12-23 Janich Hans Jurgen Procede d'actionnement d'un appareil de criblage pneumatique et appareil de criblage pour la mise en oeuvre de ce procede
US4515686A (en) * 1982-06-18 1985-05-07 Pks-Engineering Gmbh & Co. Kg Method for the operation of an air separator, and an air separator for the practice of the method
US4661244A (en) * 1985-04-25 1987-04-28 Firma Christian Pfeiffer Rotary basket air classifier
US5180113A (en) * 1990-02-01 1993-01-19 Evt Energie- Und Verfahrenstechnik Gmbh Pulverizing technique and rolling mill for use therein
US20070278706A1 (en) * 2006-05-30 2007-12-06 C. Cretors And Company Cotton candy handling device
US7641460B2 (en) * 2006-05-30 2010-01-05 C. Cretors & Company Cotton candy handling device
US20080271654A1 (en) * 2007-05-01 2008-11-06 Cavaliere William A Methods and Apparatus for Enhanced Incineration
US8020498B2 (en) * 2007-05-01 2011-09-20 Phase Inc. Methods and apparatus for enhanced incineration
CN103861810A (zh) * 2014-04-02 2014-06-18 徐国安 非金属片状物与环状物的分离器
CN103861810B (zh) * 2014-04-02 2016-01-06 徐国安 非金属片状物与环状物的分离器
CN104148286A (zh) * 2014-07-14 2014-11-19 南京西普水泥工程集团有限公司 一种用于辊压机粉磨系统的分选设备
CN104148286B (zh) * 2014-07-14 2016-06-01 南京西普水泥工程集团有限公司 一种用于辊压机粉磨系统的分选设备

Also Published As

Publication number Publication date
GB1273257A (en) 1972-05-03
DE1911417C3 (de) 1985-05-09
DE1911417A1 (de) 1970-09-24
JPS5322299B1 (enExample) 1978-07-07
FR2033785A5 (enExample) 1970-12-04
AT314948B (de) 1974-04-25
DE1911417B2 (enExample) 1979-06-28

Similar Documents

Publication Publication Date Title
US3807552A (en) Apparatus for cooling and classifying ground material
US2269412A (en) Air separator
US3155326A (en) Ore pulverizer and sizing device
US3164548A (en) Tower type pneumatic separator
US4528091A (en) Particle classifier
JPS5843270A (ja) 分級装置
US3615008A (en) Centrifugal classifying system
US4257880A (en) Centrifugal air classifying apparatus
US3371783A (en) Centrifugal air classifiers
US3901794A (en) Circulatory air sifter
US3567141A (en) Mill for grinding hard materials
US2350737A (en) Apparatus for treating cement
US3656618A (en) Air sifter
US3237766A (en) Mechanical air classifier
US3036708A (en) Particulate material separator
GB1094098A (en) Improvements in or relating to sifters
DK151047B (da) Fremgangsmaade til drift af en vindsigte og vindsigte til udoevelse af fremgangsmaaden
US2694492A (en) Rumpf ettal
US2931500A (en) Pneumatic grain cleaner
US3615009A (en) Classifying system
US2365179A (en) Grain processing apparatus
US4066535A (en) Method and apparatus for the classification of fine material from a stream of material in a circulating air classifier
US3563006A (en) Separating and cooling device for plastic granules
US2778577A (en) Oscillatory mill with air separation
US1977479A (en) Dust extraction apparatus