US3901794A - Circulatory air sifter - Google Patents

Circulatory air sifter Download PDF

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Publication number
US3901794A
US3901794A US373016A US37301673A US3901794A US 3901794 A US3901794 A US 3901794A US 373016 A US373016 A US 373016A US 37301673 A US37301673 A US 37301673A US 3901794 A US3901794 A US 3901794A
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US
United States
Prior art keywords
air
chamber
annular chamber
sifter
sifting
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
US373016A
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English (en)
Inventor
Heinrich Henne
Norbert Vorloeper
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 US3901794A publication Critical patent/US3901794A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/14—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/025—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall the material being slingered or fled out horizontally before falling, e.g. by dispersing elements
    • 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
    • B07B7/01—Selective separation of solid materials carried by, or dispersed in, gas currents using gravity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3415—Heating or cooling

Definitions

  • This invention relates to a vertically axised circulatory air sifter havinga central sifting chamber for the reception of material to be sifted and an outer annular chamber for fine material separation.
  • a rotary, circulatory fan is disposed above the sifting chamber to establish air circulation through the chambers.
  • At least one cooling air feed inlet communicates with the outer annular chamber and an air outlet communicates with the lower part of the Sifter.
  • Circulatory air sifters of the type to which the invention relates are frequently disposed downstream from a grinding plant for mineral material (e.g. cement clinker) so that the material to be sifted often has an undesirably high temperature which can deleteriously affect the quality of the fine material, for example the cement.
  • mineral material e.g. cement clinker
  • a number of circulatory air sifters have, therefore, already been developed wherein a certain amount of cooling air is constantly added, with a corresponding amount of the heated circulating air being removed.
  • Circulatory air sifters wherein a cooling air feed pipe terminates in the central sifting chamber.
  • the cooling air fed into the sifting chamber cools all the ground material, i.e., both the coarse and fine fractions; the cooling effect on the fine material which is to be withdrawn as the final product is, therefore, greatly reduced in unwanted manner, so that this fine material can only be cooled to an inadequate extent.
  • the sifting process is unfavorably affected by the supply of cooling air into the central sifting chamher.
  • a number of cooling air inlet apertures are provided in the cover of the sifter housing; cooling air is supplied from above through these apertures into the outer annular chamber (for fine material separation).
  • the lower part of the sifter (below a screen through which the circulating air, freed of the fine material, again passes into the shifting chamber) is provided with a further annular chamber, open at its base, from which a corresponding amount of heating circulating air is withdrawn via at least one connecting pipe.
  • the invention thus has for its object the provision of a circulatory air sifter of the type initially described, wherein optimum cooling of the fine material only is achieved, without the nature of the cooling air supply causing any reduction in the cyclone separation effect.
  • this object is achieved in that the cooling air feed connection is provided tangentially to the outer housing casing in such manner that the direction of flow of the incoming cooling air is generally the same as the direction of flow of the circulating air occupying the annular chamber.
  • the air needed for cooling can be fed into the fine material separation chamber (outer annular chamber) with relatively little resistance to flow, so that even with a relatively low degree of vacuum an adequate supply of cooling air is ensured, and no additional constructional measures are needed.
  • an optimum cooling can be achieved for the fine material located in the outer annular chamber and to be separated out as finished material.
  • the nature of the cooling air feed reinforces the desired effective and cyclone-line separation of the fine material from the circulatory air stream; by suitable arrangement of the cooling air feed connections it can even be improved, in that the cooling air is fed into the annular chamber at a speed such that the centrifugal force acting on the particles of the fine material to be separated out is increased.
  • the favorable effect on the cyclone-like separation in the outer annular chamber can be still further increased if the cooling air feed connection, formed as a short pipe, is inclined to the outer housing casing at an angle corresponding in general to the angle of inclination of the circulating air flowing downwards in the outer annular chamber.
  • FIG. 1 is a schematic vertical section through a circulatory air sifter in accordance with the invention.
  • FIG. 2 is a simplified plan view of the air sifter shown in FIG. 1.
  • the vertically axised circulatory air sifter shown in the drawings includes a central sifting chamber 1 formed by a cylindrical inner housing casing 2 which is joined below to a short conical section 2. In a plane below the sifting chamber is a ring of guide blades 3 which then joins a coarse material collecting hopper 4 with an outlet pipe 4.
  • the inner housing casing 2 separates the central sifting chamber 1 from an outer annular chamber 5 which is used for separation of the fine material.
  • This outer annular chamber 5 is formed by the casing 2 and by the cylindrical casing 6 of the outer sifter housing, which also comprises a generally horizontal upper cover 7 and a fine material hopper 8 adjacent the base of the casing 6, and with an outlet pipe 8 for the fine material.
  • a spreader plate 9 adapted to rotate with a central vertical sifter shaft 10 which projects from the top downwards into the sifting chamber 1 and is driven by drive means 1 1 mounted on the housing cover 7.
  • a material supply pipe 12 Coaxially with and spaced away 7 from the sifter shaft 10 there is disposed a material supply pipe 12, of funnel shape at its upper part and terminating above the spreader plate 9.
  • the material supply pipe 12 is surrounded by a hollow shaft 13 mounted coaxially with pipe 12 and which is adapted to rotate with the spreader plate 9 and thus with the sifter shaft 10.
  • At the upper part of the shaft 13 is a horizontally disposed air circulating fan 14.
  • each cooling air feed connection is disposed substantially tangentially to the outer housing casing 6 and to the annular chamber 5 in such manner that the direction of flow (cf arrow 17) of the incoming cooling air is generally the same as the direction of flow (cf arrow 18) of the circulating air occupying the annular chamber (see FIG. 2).
  • the two cooling air feed pipes 16, 16' are diametrically opposite each other.
  • the cooling air feed pipes 16, 16' are also disposed on the outer housing casing 6-at an inclination (in the direction of the annular chamber) whose angle a coincides approximately with the inclination of the circulating air flowing downwards in the outer annular chamber (fine material separation chamber); this angle of inclination a can amount to 10 7
  • the outer housing casing 6-at an inclination in the direction of the annular chamber
  • this angle of inclination a can amount to 10 7
  • cooling air is fed tangentially via pipes 16, 16' into the outer annu-lar chamber 5 (fine material separation chamber) so that in advantageous manner only this fine material is cooled, but not the coarse material.
  • the tangential a'nd slightly downwardly directed entry of the cooling air reinforces the cyclone-like separation effect, so that the fine material can be separated from the air stream particularly effectively.
  • a circulatory air sifter in accordance with the invention may be formed in other ways than in FIGS. 1 and 2. It is also possible to replace the cooling air feed pipes for instance by a type of screen at the periphery of the outer housing casing in order to pass therethrough the necessary cooling air. Finally, it should be stated that, especially for large air sifter constructions, the cooling air feed pipes 16, 16' could also be disposed on the outer housing casing above the plane defined by the horizontal central plane of the fan.
  • a vertically axised circulatory air sifter construction comprising an inner cylindrical casing forming a sifting chamber; and outer cylindrical casing enclosing said inner casing and forming with the latter an annular separation chamber; means for introducing to said sift.- ing chamber material to be sifted; for means rotatable in a horizontal plane for establishing a flow of air circumferentially and downwardly through said annular chamber and thence upwardly through said sifting chamber at least one tubular secondary air inlet member having its axis tangential to said annular chamber and opening directly into said annular chamber at a level below the plane of rotation of said fan means for introducing cooling air into said annular chamber in a direction corresponding to the circumferential direction of air fiow through said annular chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
US373016A 1972-07-21 1973-06-25 Circulatory air sifter Expired - Lifetime US3901794A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2235789A DE2235789C3 (de) 1972-07-21 1972-07-21 Vertikalachsiger Umluft-Windsichter

Publications (1)

Publication Number Publication Date
US3901794A true US3901794A (en) 1975-08-26

Family

ID=5851255

Family Applications (1)

Application Number Title Priority Date Filing Date
US373016A Expired - Lifetime US3901794A (en) 1972-07-21 1973-06-25 Circulatory air sifter

Country Status (7)

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US (1) US3901794A (enrdf_load_html_response)
JP (1) JPS4952361A (enrdf_load_html_response)
AT (1) AT323676B (enrdf_load_html_response)
DE (1) DE2235789C3 (enrdf_load_html_response)
FR (1) FR2193639B1 (enrdf_load_html_response)
GB (1) GB1398036A (enrdf_load_html_response)
IT (1) IT991037B (enrdf_load_html_response)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390419A (en) * 1981-10-16 1983-06-28 Omya Gmbh Centrifugal classifier
US4409097A (en) * 1981-10-16 1983-10-11 Omya Gmbh Improved pivotable centrifugal classifier and method of classifying
US5032222A (en) * 1987-07-03 1991-07-16 Ciba-Geigy Corporation Spray drier for the preparation of powders, agglomerates and the like
US5055182A (en) * 1989-01-12 1991-10-08 Krupp Polysius Ag Separator
USD456429S1 (en) 1997-02-26 2002-04-30 Warman International Limited Feed housing liner for a hydrocyclone feed assembly
USD464067S1 (en) 1997-02-26 2002-10-08 Warman International Limited Feed housing for a hydrocyclone feed assembly
US6739456B2 (en) 2002-06-03 2004-05-25 University Of Florida Research Foundation, Inc. Apparatus and methods for separating particles
US20050242008A1 (en) * 2004-04-29 2005-11-03 Peter Simpson Material classifier
ITMI20082295A1 (it) * 2008-12-22 2010-06-23 Project And Dev Llc Separatore aeraulico

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6430683A (en) * 1987-07-24 1989-02-01 Nippon Oxygen Co Ltd Air-force selector
ATE180987T1 (de) * 1994-09-08 1999-06-15 Schlattl Werner Bavaria Tech Vorrichtung zum abscheiden von öl und/oder russ und/oder anderen fremdstoffen aus einem luft-, gas- und/oder dampfstrom
DE10010406A1 (de) * 2000-03-03 2001-09-06 Kloeckner Humboldt Wedag Verfahren und Anlage zur zweistufigen Sichtung körnigen Gutes
CN112452750B (zh) * 2020-10-29 2021-09-03 南京图治自动化科技有限公司 一种重质异物去除装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1509915A (en) * 1922-11-09 1924-09-30 Albert H Stebbins Concentrator
US2890764A (en) * 1953-12-07 1959-06-16 Gerald D Arnold Method and apparatus for centrifugal separation with uni-directional flow at the point of separation
US3175686A (en) * 1960-10-08 1965-03-30 Rieth Hans Method and apparatus for cooling and reconditioning molding sand
US3349548A (en) * 1964-01-22 1967-10-31 C C Ind Cyclone separator for separating steam from water
US3358844A (en) * 1965-08-17 1967-12-19 Siemens Ag Device for increasing the total amount of separation of a vortex separator
US3656618A (en) * 1968-06-19 1972-04-18 Polysius Ag Air sifter
US3682302A (en) * 1969-03-01 1972-08-08 Paul Bernutat Air separator
US3734287A (en) * 1969-01-25 1973-05-22 Westfalia Dinnendahl Air classifier assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1273257A (en) * 1916-10-26 1918-07-23 Schroeder Headlight & Generator Company Fluid-turbine.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1509915A (en) * 1922-11-09 1924-09-30 Albert H Stebbins Concentrator
US2890764A (en) * 1953-12-07 1959-06-16 Gerald D Arnold Method and apparatus for centrifugal separation with uni-directional flow at the point of separation
US3175686A (en) * 1960-10-08 1965-03-30 Rieth Hans Method and apparatus for cooling and reconditioning molding sand
US3349548A (en) * 1964-01-22 1967-10-31 C C Ind Cyclone separator for separating steam from water
US3358844A (en) * 1965-08-17 1967-12-19 Siemens Ag Device for increasing the total amount of separation of a vortex separator
US3656618A (en) * 1968-06-19 1972-04-18 Polysius Ag Air sifter
US3734287A (en) * 1969-01-25 1973-05-22 Westfalia Dinnendahl Air classifier assembly
US3682302A (en) * 1969-03-01 1972-08-08 Paul Bernutat Air separator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390419A (en) * 1981-10-16 1983-06-28 Omya Gmbh Centrifugal classifier
US4409097A (en) * 1981-10-16 1983-10-11 Omya Gmbh Improved pivotable centrifugal classifier and method of classifying
US5032222A (en) * 1987-07-03 1991-07-16 Ciba-Geigy Corporation Spray drier for the preparation of powders, agglomerates and the like
US5055182A (en) * 1989-01-12 1991-10-08 Krupp Polysius Ag Separator
USD456429S1 (en) 1997-02-26 2002-04-30 Warman International Limited Feed housing liner for a hydrocyclone feed assembly
USD464067S1 (en) 1997-02-26 2002-10-08 Warman International Limited Feed housing for a hydrocyclone feed assembly
US6739456B2 (en) 2002-06-03 2004-05-25 University Of Florida Research Foundation, Inc. Apparatus and methods for separating particles
US20050242008A1 (en) * 2004-04-29 2005-11-03 Peter Simpson Material classifier
ITMI20082295A1 (it) * 2008-12-22 2010-06-23 Project And Dev Llc Separatore aeraulico

Also Published As

Publication number Publication date
IT991037B (it) 1975-07-30
DE2235789C3 (de) 1974-12-12
AT323676B (de) 1975-07-25
DE2235789B2 (enrdf_load_html_response) 1974-05-09
FR2193639A1 (enrdf_load_html_response) 1974-02-22
JPS4952361A (enrdf_load_html_response) 1974-05-21
DE2235789A1 (de) 1974-02-07
FR2193639B1 (enrdf_load_html_response) 1978-07-21
GB1398036A (en) 1975-06-18

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