US2564595A - Whizzer separator with helical deflector - Google Patents

Whizzer separator with helical deflector Download PDF

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Publication number
US2564595A
US2564595A US45748A US4574848A US2564595A US 2564595 A US2564595 A US 2564595A US 45748 A US45748 A US 45748A US 4574848 A US4574848 A US 4574848A US 2564595 A US2564595 A US 2564595A
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United States
Prior art keywords
whizzer
casing
gas
deflector
separator
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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
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US45748A
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English (en)
Inventor
Crites Joe
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.)
Combustion Engineering Inc
Original Assignee
Combustion Engineering Superheater Inc
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Filing date
Publication date
Application filed by Combustion Engineering Superheater Inc filed Critical Combustion Engineering Superheater Inc
Priority to US45748A priority Critical patent/US2564595A/en
Priority to DEP26962A priority patent/DE894950C/de
Application granted granted Critical
Publication of US2564595A publication Critical patent/US2564595A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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

Definitions

  • This invention relates to improvement in means for selectively separating finer from coarser particles of dust like material and particularly to a new and useful improvement in separating devices known as whizzer separators.
  • Whizzer separators may be employed, by way of example, in separator apparatus of the general type disclosed in the patents to Cook 1,783,374 and to Crites 2,169,680 in which they selectively separate finer particles from coarser particles, and in mills of the general type disclosed in the patent to OMara 2,108,609, wherein they assist in selectively determining the grade of pulverized material to be withdrawn from the mill.
  • the material to be separated comprises dustlike particle sizes all of which are sufiiciently fine to be entrained in a current of air or gas and are carried through the whizzer separator in flotation in the gas.
  • the whizzer separator is interposed adjacent the outlet of a separator or mill or other apparatus from which the fines are to be separated, and rejects the heavier particles from the gas stream back into the apparatus and selectively determines the fineness or grade of material that will be carried by the gas through the outlet.
  • the whizzer comprises a multiplicity of substantially radial blades mounted for rotation about an axis.
  • a concentric plate covers the central portions of the blades to confine the gas flow through the whizzer to an annular portion adjacent the outer ends of the blades.
  • the outer ends of the blades have heretofore been beveled and spaced in close clearance from a stationary conical deflector plate which slopes inwardly from the conduit or casing confining the gas and in the direction of gas flow through the conduit.
  • the dust laden gas in going through the whizzer is not completely separated until the whirling gas stream has passed through the whizzer into a space where there is less turbulence and a relatively smooth flow of gas along the casing Wall, that is, in the classifying zone beyond the Whizzer.
  • the larger rejected particles or so called tailings separated in this zone must then flow back through the whizzer adjacent the deflector plate and in many cases this flow causes eX- tremely objectionable wear on the whizzer blades where this back flow occurs.
  • Fig. l is a vertical section, taken on line I--I of Fig. 2, through one illustrative form of apparatus employing the invention. 7
  • Fig. 2 is a horizontal section taken on line 22 of Fig. 1.
  • the mill I comprises the upright casing 2, usually cylindrical, which is centered about the central vertical axis 3 and is supportedby foundation 5.
  • the central vertical shaft 5 is rotatable in bearings 6 and l in the supporting structure 8 and carries at its lower end a beveled gear 9 which meshes with a pinion IE on the drive shaft II projecting horizontally from the supporting foundation 4 and driven from any suitable source of power (not shown).
  • the spider I2 carried at the upper end of shaft 5 supports circularly arranged rollercarriers l3, each pivoted in spider l 2 at M so that the grinding rollers [5 which are supported by carriers I3 for free rotation may swing radially toward or from the shaft 5.
  • a fan (not shown) connected to the mill outlet conduit I9, draws air into the mill housing from the annular manifold 20 through inlet openings 2! and thence upwardly through the mill housing, this air stream picking up in suspension such material as is sufficiently finely pulverized to be carried by the air stream.
  • the air-suspended material must first pass through the whizzer separator 22 which is interposed between the upper end of the mill and the outlet conduit l9.
  • the separator casing here illustrated comprises substantially an upward extension of the mill casing 2 and consists of a top or closure plate23 from the central portion of which the outlet conduit I9 extends, an upper cylindrical shell 24, and a lower joining shell 25 which connects the lower portion of shell 24 with the upper edge of mill housing 2.
  • a gear casing 26 is supported centrally within the conical casing 25 by means of a plurality of radially extending plates 21.
  • the rotary deflector of whizzer 22 is carried by the vertical shaft 28 journaled in gear casing 26 about the central vertical axis 3.
  • the rotary whizzer 22 comprises a closed central disk-like portion 30 from which extend a plurality of radially projecting vanes or blades 3
  • are parallel to the axis of rotation as indicated at 32 and rotate in close proximity to the inner edges of an annular deflector plate 33 extending inwardly from the casing 24.
  • this deflector plate 33 is mounted on casing 24 in the form of a helix (compare left and right portions of Fig. 1) with its inner edge closely adjacent the outer ends 32 of the vanes 3
  • the pitch of this helical deflector plate 33 is about equal to the axial width of the vane ends 32 and the circular length of the plate 33 is preferably about 1% of the circumference so as to provide an overlap (shown at left portion of Fig. 2).
  • the helical deflector plate 33 may if desired be extended along the casing wall 25 beyond the limits of the whizzer vanes 3 I.
  • the whizzer with the improved deflector plate '33 provides a continuous return of tailings to the mill without their touching vanes 3
  • a multiplicity of helicallyshaped deflector plates spaced around the periphery of the whizzer may be used instead of the single deflector plate without departing from the spirit of the invention; in which event the pitch of each plate will at least equal the width of the whizzer blade 32.
  • a separator comprising a casing, means for causing a forward axial flow through the casing of gas entraining material to be separated therefrom, and an assembly mounted within the casing comprising a rotary whizzer having a relatively high rotational speed and through which all of the material laden gas passes forwardly from a location in advance of the whizzer to a location therebeyond, the combination of a helical deflector having one edge closely adjacent the periphery of the whizzer and extending thence radially to the casing to form a barrier against the forward passage of said material laden gas between the whizzer and the casing, said deflector being shaped to form a helical surface of at least one turn in circumferential length, the helical path of said surface, considered in the direction of rotation of the whizzer being reverse or up stream axially with respect to the forward or downstream flow of material laden gas through the whizzer whereby gas and material from beyond the deflector entering the helical
  • a separator comprising a cylindrical casing mounted with its axis generally vertical, means for causing an upward flow through the casing of gas entraining material to be separated therefrom, and an assembly mounted within the casing comprising spaced rotary Whizzer blades between which all of the material laden gas passes upwardly from a location below the whizzer blades to a location thereabove, the combinaton of a helical deflector plate having one edge closely adjacent the periphery of the whizzer blades and extending thence radially and normal to the casing to form a barrier against upward passage of said material laden gas between the blades and the casing, said deflector plate being shaped to form a helical surface of more than one turn in circumferential length, the helical path of said surface, considered in the direction of rotation of the whizzer blades being downward in opposition to the upward flow of material laden gas through the whizzer and of a pitch equal to at least the axial width of said blades whereby gas and

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  • Combined Means For Separation Of Solids (AREA)
  • Centrifugal Separators (AREA)
US45748A 1948-08-23 1948-08-23 Whizzer separator with helical deflector Expired - Lifetime US2564595A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US45748A US2564595A (en) 1948-08-23 1948-08-23 Whizzer separator with helical deflector
DEP26962A DE894950C (de) 1948-08-23 1948-12-24 Schleudersichter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US45748A US2564595A (en) 1948-08-23 1948-08-23 Whizzer separator with helical deflector

Publications (1)

Publication Number Publication Date
US2564595A true US2564595A (en) 1951-08-14

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ID=21939654

Family Applications (1)

Application Number Title Priority Date Filing Date
US45748A Expired - Lifetime US2564595A (en) 1948-08-23 1948-08-23 Whizzer separator with helical deflector

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US (1) US2564595A (de)
DE (1) DE894950C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058246A1 (en) 1998-05-13 1999-11-18 Abb Alstom Power Inc. Control method and system for a coal mill in boilers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1826406A (en) * 1930-02-01 1931-10-06 Sturtevant Mill Co Air separator
US1955960A (en) * 1930-12-09 1934-04-24 Hirsch Paul Arthur Pulverizing machine
US2010128A (en) * 1931-09-17 1935-08-06 Gerald D Arnold Centrifugal separator
US2195618A (en) * 1937-06-04 1940-04-02 Comb Eng Co Inc Adjustable separator
US2286987A (en) * 1940-12-24 1942-06-16 Sturtevant Mill Co Air separator
US2329208A (en) * 1940-05-29 1943-09-14 Henry G Lykken Pulverizing and classifying machine
US2434037A (en) * 1943-04-02 1948-01-06 Babcock & Wilcox Co Material classifier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1783357A (en) * 1929-12-23 1930-12-02 Int Comb Eng Corp Mechanical separator
US2108609A (en) * 1935-04-15 1938-02-15 Comb Eng Co Inc Whizzer separator and mill
US2169680A (en) * 1937-03-24 1939-08-15 Comb Eng Co Inc Whizzer separator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1826406A (en) * 1930-02-01 1931-10-06 Sturtevant Mill Co Air separator
US1955960A (en) * 1930-12-09 1934-04-24 Hirsch Paul Arthur Pulverizing machine
US2010128A (en) * 1931-09-17 1935-08-06 Gerald D Arnold Centrifugal separator
US2195618A (en) * 1937-06-04 1940-04-02 Comb Eng Co Inc Adjustable separator
US2329208A (en) * 1940-05-29 1943-09-14 Henry G Lykken Pulverizing and classifying machine
US2286987A (en) * 1940-12-24 1942-06-16 Sturtevant Mill Co Air separator
US2434037A (en) * 1943-04-02 1948-01-06 Babcock & Wilcox Co Material classifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058246A1 (en) 1998-05-13 1999-11-18 Abb Alstom Power Inc. Control method and system for a coal mill in boilers

Also Published As

Publication number Publication date
DE894950C (de) 1953-10-29

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