EP0636416A2 - Broyeur à rouleaux contenant un classificateur rotatif - Google Patents

Broyeur à rouleaux contenant un classificateur rotatif Download PDF

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Publication number
EP0636416A2
EP0636416A2 EP94106620A EP94106620A EP0636416A2 EP 0636416 A2 EP0636416 A2 EP 0636416A2 EP 94106620 A EP94106620 A EP 94106620A EP 94106620 A EP94106620 A EP 94106620A EP 0636416 A2 EP0636416 A2 EP 0636416A2
Authority
EP
European Patent Office
Prior art keywords
mill
rotary classifier
weir
air flow
rotary
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.)
Withdrawn
Application number
EP94106620A
Other languages
German (de)
English (en)
Other versions
EP0636416A3 (fr
Inventor
Hidenori C/O Nagasaki Shipyard & Mach. Sakamoto
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0636416A2 publication Critical patent/EP0636416A2/fr
Publication of EP0636416A3 publication Critical patent/EP0636416A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the present invention relates to a roller mill containing therein a rotary classifier such as, for example, a coal beater employed for a coal-burning boiler in a utility or non-utility electric power plant, a cement grinding mill or the like.
  • a rotary classifier such as, for example, a coal beater employed for a coal-burning boiler in a utility or non-utility electric power plant, a cement grinding mill or the like.
  • raw material to be ground such as coal or the like is ground by a grinding roller 2 rotating on a grinding table 1, and the ground raw material 3 is carried upwards within the mill by carrier air flows rising within the mill.
  • a rotary classifier having blades 7 rotating about a vertical rotary shaft at the center of the mill as driven by a rotor 8 directed in the vertical direction, and deflector vanes 9 mounted to a mill top plate 5a forming a ceiling surface 5 of the mill top, the flows of the ground raw material 3 and the carrier air flow 4 are caused to pass through the blades 7 of the rotary classifier by means of the deflector vanes 9, and fine powder classified by the rotary classifier is discharged through a fine powder outlet 6 provided on the mill top plate 5a.
  • the rotary classifier is equipped with a gap clearance 11 of 2 - 4 mm retained between the ceiling surface 5 and the classifier. Due to the fact that a rotary classifier is one kind of fan, a static pressure P1 at the inlet of the blades 7 is somewhat higher than a static pressure P2 within the blades 7. Accordingly, the air flow 4a containing coarse particles and flowing along the ceiling surface 5 is caused to take a short-cut as indicated by an arrow 4b due to the above-mentioned pressure difference (P1 > P2).
  • a roller mill containing therein a rotary classifier, wherein a weir having an annular cross-section for diverting an air flow separated from a carrier air flow rising within the mill and flowing towards the center axis of the mill along a mill to ceiling surface as containing coarse particles into a descending flow, is mounted to the mill top ceiling surface coaxially with a rotary shaft of the rotary classifier radially on the outside of blades of the rotary classifier, and wherein the bottom end of the aforementioned weir is located at the position where the above-mentioned descending flow is made to join with a main flow of the carrier air flow rising within the mill.
  • the air flow flowing along the mill top ceiling surface towards the center axis of the mill as containing coarse particles would collide against the weir and would be diverted into a descending flow. Since the bottom end of the weir is located at the position where the descending flow is made to join with a main flow of the carrier air flow, the descending flow containing coarse particles would join with the main flow of the carrier air and then would pass through the rotary classifier. During this period, the coarse particles are classified by the rotary classifier. As described above, the improved roller mill can eliminate the coarse particles short-cutting the rotary classifier, and therefore, lowering of a classification precision can be prevented.
  • a weir 14 of truncated conical shape having a cross-section at its lower portion reduced is disposed coaxially with a rotary shaft of a rotary classifier radially on the outside of blades 7 of the rotary classifier and on the inside of deflector vanes 9, and the upper end of this weir 14 is mounted to a mill top ceiling surface 5.
  • the bottom end of this weir 14 is positioned within a main flow of carrier air 4 rising within the mill.
  • the bottom end of the weir 14 is set lower than the top end of the blades 7 of the rotary classifier by a height H as defined by the following formula: H > (0.7 - 1.5) x W, where
  • an air flow 4a containing coarse particles and flowing towards the center axis of the mill along the mill top ceiling surface 5 is diverted into a descending flow and joins with the main flow 4 of the carrier air flow rising within the mill, and when passing through the blades 7, the coarse particles would be separated from the carrier air flow and would fall to be ground again by a grinding roller on a grinding table.
  • an air flow containing coarse particles and short-cutting the rotary classifier can be eliminated by the weir 14, and so, lowering of a classification precision of the rotary classifier can be prevented.
  • weir could be formed in a cylindrical shape, and so long as it is formed in an annular shape, its horizontal cross-section shape need not be toroidal but could be, for instance, polygonal.
  • the weir could be mounted to the mill top ceiling surface via an appropriate member instead of being mounted directly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP94106620A 1993-07-29 1994-04-27 Broyeur à rouleaux contenant un classificateur rotatif. Withdrawn EP0636416A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP188072/93 1993-07-29
JP18807293A JPH0739772A (ja) 1993-07-29 1993-07-29 回転式分級器を内蔵したローラミル

Publications (2)

Publication Number Publication Date
EP0636416A2 true EP0636416A2 (fr) 1995-02-01
EP0636416A3 EP0636416A3 (fr) 1995-07-19

Family

ID=16217219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106620A Withdrawn EP0636416A3 (fr) 1993-07-29 1994-04-27 Broyeur à rouleaux contenant un classificateur rotatif.

Country Status (2)

Country Link
EP (1) EP0636416A3 (fr)
JP (1) JPH0739772A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090004A1 (fr) * 2001-05-10 2002-11-14 Loesche Gmbh Separateur

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4123553B2 (ja) * 1997-12-25 2008-07-23 アイシン精機株式会社 ドアアウトサイドハンドル装置
JP3718592B2 (ja) * 1998-08-05 2005-11-24 バブコック日立株式会社 竪型ローラミルならびに石炭焚ボイラシステム
DE102016121925A1 (de) * 2016-11-15 2018-05-17 Neuman & Esser Gmbh Mahl- Und Sichtsysteme Sichter, Mühle und Verfahren zum Sichten eines Gas-Feststoff-Gemischs
JP7131556B2 (ja) * 2017-08-09 2022-09-06 Ｕｂｅマシナリー株式会社 竪型粉砕機

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0172731A2 (fr) * 1984-08-18 1986-02-26 Kawasaki Jukogyo Kabushiki Kaisha Classification et commande pour broyeur vertical
JPH02152582A (ja) * 1988-12-02 1990-06-12 Babcock Hitachi Kk 回転分級機を備えたミル

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0172731A2 (fr) * 1984-08-18 1986-02-26 Kawasaki Jukogyo Kabushiki Kaisha Classification et commande pour broyeur vertical
JPH02152582A (ja) * 1988-12-02 1990-06-12 Babcock Hitachi Kk 回転分級機を備えたミル

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14 no. 403 (C-0753) ,31 August 1990 & JP-A-02 152582 (BABCOCK HITACHI) 12 June 1990, *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090004A1 (fr) * 2001-05-10 2002-11-14 Loesche Gmbh Separateur

Also Published As

Publication number Publication date
JPH0739772A (ja) 1995-02-10
EP0636416A3 (fr) 1995-07-19

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