US3381901A - Grinding device in a fluidized layer - Google Patents

Grinding device in a fluidized layer Download PDF

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Publication number
US3381901A
US3381901A US552126A US55212666A US3381901A US 3381901 A US3381901 A US 3381901A US 552126 A US552126 A US 552126A US 55212666 A US55212666 A US 55212666A US 3381901 A US3381901 A US 3381901A
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US
United States
Prior art keywords
cages
grinding
deflector
fluidized layer
driving shaft
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
US552126A
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English (en)
Inventor
Foch Pierre
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.)
Charbonnages de France CDF
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Charbonnages de France CDF
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Publication date
Application filed by Charbonnages de France CDF filed Critical Charbonnages de France CDF
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Publication of US3381901A publication Critical patent/US3381901A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/20—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/13—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and combined with sifting devices, e.g. for making powdered fuel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods

Definitions

  • the present invention relates to an improved apparatus for the simultaneous grinding, sorting, and when so required drying, of granular, non-agglutinant materials.
  • a fluidization reactor comprising a percussion grinder, for example of the squirrel cage disintegrator type, immersed partly or wholly in a fluidized layer of the material to be treated.
  • the supply of material to be treated to the fluidized bed is made by pneumatic conveyance of the said material by means of hot combustion gases passing into the fluidized layer under the moving system of the squirrel cage disintegrator.
  • a device of this kind is described in the French Patent No. 1,357,803 of Feb. 28, 1963.
  • This device has the advantage of permitting the use of combustion or other gases at higher temperatures than in drying in a conventional fluidized bed, which makes it possible to reduce the contact time of the fine products with the gas or the combustion gases which convey them.
  • This wear is due to the formation of a heap of material to be ground in the central zone of the layer, located immediately beneath the moving system of the grinder.
  • the present invention has for its object improvements in this kind of installation, the said improvements having the essential object of preventing preferential wear of the bars of the rotating system.
  • the improved device in accordance with the invention comprises essentially. a fluidization chamber, at the base of which a closed conduit opens vertically, this conduit being traversed from the bottom to the top by the hot gases conveying the material to be treated, and percussion grinding means of the squirrel cage disintegrator type, and is essentially characterized in that the moving system of the grinder is constituted by a plurality of rotating cages with bars mounted side by side on the same driving shaft and separated from each other by a free space.
  • the cages are of the same diameter.
  • a fixed deflector system placed under each free space channels the products to be treated towards the said space;
  • a deflector system carried by the driving shaft of the moving system inside each free space channels the products to be treated towards the interior of the cages adjacent the said space;
  • a fixed impact plate extending over all or part of the width of the fluidization chamber is placed above each free space.
  • the deflector system placed inside each free space is rigidly fixed on the driving shaft of the moving system of the grinder.
  • the deflector system placed inside each free space is freely mounted on the driving shaft.
  • FIGS. 1 and 2 are two diagrammatic sections of one form of embodiment of the device according to the invention, comprising a fixed deflector and an impact plate;
  • FIGS. 3 and 4 are two diagrammatic sections of another form of embodiment of the device according to the invention, comprising a deflector rigidly fixed to the driving shaft of the moving system of the grinder.
  • the apparatus shown by way of example in FIGS. 1 and 2 is essentially composed of a fluidization chamber 1 with a rectangular section at the base 2 of which opens the vertical conduit 3, through which pass, in the direction of the arrow F, the hot combustion or other gases which convey the materials to be ground, already partly dried during the course of their pneumatic conveyance. As the speed of the drying gases becomes lower, the material forms a fluidized layer of low density.
  • a grinding device of the squirrel cage disintegrator type At the lower portion of the vertical chamber 1 is provided a grinding device of the squirrel cage disintegrator type.
  • the moving system of the grinder is constituted by two cages 51 and 52, fixed for rotation on the driving shaft 6, and separated from the other by a free space 7
  • This particular arrangement facilitates the introduction into the two cages of the products which have a tendency to be concentrated in the central portion of the moving system.
  • each space an impact plate fixed to the wall of the chamber 1 and constituted for example by a strip of sheet steel 8 having a width substantially equal to that of the space and extending over the whole width of the fluidization chamber.
  • Two plates 9 and 10 converging towards the top are placed under each space and may constitute fixed deflector system intended to channel towards the space 7 those products which have a tendency to accumulate in the central part of the moving system of the grinder.
  • FIGS. 3 and 4 The form of construction shown in FIGS. 3 and 4 is an alternative form of easier construction and assembly.
  • the deflector system intended to channel the products into the central zone of the moving system is constituted by a wheel 11 mounted on the driving shaft 6 and the space 7 which separates two adjacent cages.
  • This wheel is such that the products are channelled towards the interior of each cage.
  • this wheel furthermore prevents the passage of grains which have a tendency to pass through the moving system without passing into the cages.
  • the said wheel can be fixed for rotation with the shaft 6, as shown, or mounted freely rotatable on the said shaft.
  • the invention may be applied to grinding operations combined With operations of thermal treatment of granular or powdered solids other than drying.
  • the moving system of the grinder may be composed of more than two cages, and also each rotating cage may be constituted by a number of concentric cages independent for rotation or not.
  • a moving grinding system constituted:
  • each of said reflector systems co-operating with a free space and being adapted to channel the products to be treated towards the interior of the cages adjacent to said space.
  • each deflector system is constituted on the one hand by fixed deflector plates arranged under the free space and converging towards this latter, and on the other hand by a fixed impact plate arranged above the free space and extending substantially over the width of said fluidization chamber.
  • each deflector system is constituted by deflector plates arranged in the interior of the free space between the cages adjacent to said space and diverging towards said cages, said deflector plates being driven in rotation by the driving shaft of said cages.
  • each deflector system is constituted by deflector plates arranged in the interior of the free space between the cages adjacent to said space and diverging towards said cages, said deflector plates being mounted freely on the driving shaft of said cages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Crushing And Grinding (AREA)
US552126A 1965-05-26 1966-05-23 Grinding device in a fluidized layer Expired - Lifetime US3381901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR18592A FR1444902A (fr) 1965-05-26 1965-05-26 Dispositif de broyage en couche fluidisée

Publications (1)

Publication Number Publication Date
US3381901A true US3381901A (en) 1968-05-07

Family

ID=8580027

Family Applications (1)

Application Number Title Priority Date Filing Date
US552126A Expired - Lifetime US3381901A (en) 1965-05-26 1966-05-23 Grinding device in a fluidized layer

Country Status (5)

Country Link
US (1) US3381901A (cs)
BE (1) BE681547A (cs)
DE (1) DE1507487A1 (cs)
FR (1) FR1444902A (cs)
GB (1) GB1115163A (cs)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007037A1 (de) * 1978-07-03 1980-01-23 von Bennigsen-Mackiewicz, Andreas, Dipl.-rer.pol. Verfahren und Vorrichtung zur Herstellung von Puderzucker
US4819884A (en) * 1985-01-31 1989-04-11 Microfuel Corporation Means of pneumatic comminution
US4819885A (en) * 1985-01-31 1989-04-11 Microfuel Corporation Means of pneumatic comminution
US4824031A (en) * 1985-01-31 1989-04-25 Microfuel Corporation Means of pneumatic comminution
US4923124A (en) * 1985-01-31 1990-05-08 Microfuel Corporation Method of pneumatic comminution

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9300606A (nl) * 1993-04-07 1994-11-01 Gemco Eng Bv Werkwijze en inrichting voor het mechanisch regenereren van gebruikt zand.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US167742A (en) * 1875-09-14 Improvement in pulverizing-machines for clay and similar substances
US864443A (en) * 1902-06-26 1907-08-27 United Lead Company Apparatus for pulverizing metallic lead.
US2022000A (en) * 1933-01-28 1935-11-26 Austin A Holbeck Apparatus for breaking material
US2075506A (en) * 1935-06-13 1937-03-30 Raymond Brothers Impact Pulver Drying apparatus
US2149018A (en) * 1937-08-12 1939-02-28 Comb Eng Co Inc Drying apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US167742A (en) * 1875-09-14 Improvement in pulverizing-machines for clay and similar substances
US864443A (en) * 1902-06-26 1907-08-27 United Lead Company Apparatus for pulverizing metallic lead.
US2022000A (en) * 1933-01-28 1935-11-26 Austin A Holbeck Apparatus for breaking material
US2075506A (en) * 1935-06-13 1937-03-30 Raymond Brothers Impact Pulver Drying apparatus
US2149018A (en) * 1937-08-12 1939-02-28 Comb Eng Co Inc Drying apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007037A1 (de) * 1978-07-03 1980-01-23 von Bennigsen-Mackiewicz, Andreas, Dipl.-rer.pol. Verfahren und Vorrichtung zur Herstellung von Puderzucker
US4819884A (en) * 1985-01-31 1989-04-11 Microfuel Corporation Means of pneumatic comminution
US4819885A (en) * 1985-01-31 1989-04-11 Microfuel Corporation Means of pneumatic comminution
US4824031A (en) * 1985-01-31 1989-04-25 Microfuel Corporation Means of pneumatic comminution
US4923124A (en) * 1985-01-31 1990-05-08 Microfuel Corporation Method of pneumatic comminution

Also Published As

Publication number Publication date
FR1444902A (fr) 1966-07-08
GB1115163A (en) 1968-05-29
BE681547A (cs) 1966-11-25
DE1507487A1 (de) 1969-09-11

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