EP0068681A2 - Broyeur à galets vertical - Google Patents

Broyeur à galets vertical Download PDF

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Publication number
EP0068681A2
EP0068681A2 EP82302980A EP82302980A EP0068681A2 EP 0068681 A2 EP0068681 A2 EP 0068681A2 EP 82302980 A EP82302980 A EP 82302980A EP 82302980 A EP82302980 A EP 82302980A EP 0068681 A2 EP0068681 A2 EP 0068681A2
Authority
EP
European Patent Office
Prior art keywords
air
separator
ejector
mill
outlet
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Withdrawn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
EP82302980A
Other languages
German (de)
English (en)
Other versions
EP0068681A3 (fr
Inventor
Sven Ole Svensson
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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 FLSmidth and Co AS filed Critical FLSmidth and Co AS
Publication of EP0068681A2 publication Critical patent/EP0068681A2/fr
Publication of EP0068681A3 publication Critical patent/EP0068681A3/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Withdrawn legal-status Critical Current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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/007—Mills with rollers pressed against a rotary horizontal disc
    • 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 invention relates to a method of providing unimpeded discharge of coarse material from a built-in stationary separator housed in a vertical roller mill.
  • a typical vertical roller mill comprises a grinding table rotating about a vertical axis and having a grinding path on which grinding rollers roll and, during the rotation of the table, grind the material supplied.
  • the grinding rollers have stationary shafts and are urged against the grinding path by means of hydraulic cylinders or springs.
  • the material to be ground is directed to the centre of the grinding table and is, by the rotation of the table, moved outwards to the grinding path. Ground material passes on beyond the periphery of the table and across a ring of nozzles encircling the table.
  • Conveying, and possibly also drying, air is introduced beneath the nozzle ring and flows up through the nozzle ring thereby entraining the ground material in suspension.
  • This suspension is passed upwards through, and to the top of the mill housing and into the stationary separator in which the coarse material, i.e. insufficiently ground material, is separated from the suspension and falls towards the bottom of the separator, whereas the fine material, i.e. sufficiently ground material, leaves the mill housing and the separator at the top together with the conveying air.
  • the bottom part of the separator is conical and ends in an outlet for coarse material oriented towards the grinding table.
  • the insufficiently ground material is returned through this outlet to the grinding table for further grinding.
  • the conveying air On its way through the mill housing the conveying air experiences two marked pressure drops, namely when passing through the nozzle ring from the bottom part of the mill housing to the grinding chamber and when passing from the chamber to the separator.
  • the air passage into the separator preferably takes place through guide vanes imparting a cyclonic movement to the air in the separator, which movement encourages the separation of coarse material from the suspension.
  • the invention also includes a vertical roller mill with a built-in stationary separator for carrying out the method according to the invention, the mill further comprising an air supply pipe for supplying conveying air to the grinding chamber of the mill; an ejector positioned inside the separator above, and oriented towards, its coarse material outlet; and an air supply pipe for the ejector, which pipe is connected to the same air source as that to which the air supply pipe for the grinding chamber is connected.
  • both the air supply pipe of the ejector and the air supply pipe of the mill can supply atmospheric air direct as drying air.
  • a grinding table 1 rotates about its vertical axis, driven via a gear 2.
  • Grinding rollers 3 roll on and against the grinding table, the rollers being mounted on a common carrying frame 4 and urged against the grinding table by means of known push or pull means.
  • a ring of nozzles 5 encircles the table, and above the table and carrying frame is fitted a stationary separator 6 having, at its top, an inlet for suspended material in the form of a ring of adjustable vanes 7, and, at its bottom, an outlet 8 for coarse material separated in the separator.
  • Conveying air and possible drying air to the mill are introduced at the bottom of the housing 9 through an air supply pipe 10 into a chamber below the grinding table 1 and the nozzle ring 5.
  • Spent mill air with fine material i.e. material sufficiently ground in the mill, is discharged from the mill through an air outlet 11 above the separator 6.
  • Material to be ground is supplied from outside and passed through a duct not shown down towards the centre of the grinding table 1 and moves due to the rotation of the grinding table outwards and under the grinding rollers 3 where it is ground, and hence beyond the nozzle ring 5.
  • the coarse material is separated in the separator 6 and falls down through the hopper-shaped part of the separator towards the separator outlet 8 and hence onto the grinding table for renewed treatment together with freshly supplied, not ground material.
  • the pressure exerted by the conveying and drying air in the supply pipe 10 and consequently in the chamber below the grinding table 1 and the nozzle ring 5 is designated P 1 .
  • This pressure can in case of sub-pressure mills be the atmospheric air pressure.
  • an ejector 12 is positioned immediately above the separator outlet 8 and downwardly oriented towards same.
  • the air to the ejector 12 is supplied via a pipe 13 connected to the supply pipe 10 for conveying and drying air for the mill.
  • the air is forced through the pipe 13 and the ejector 12 by means of the pressure difference P 1 -P 2' prevailing over the nozzle ring 5.
  • the air jet When the air leaves the ejector 12, the air jet is spread so that the entire opening of the coarse material outlet 8 is covered by the air jet. At the same time the dynamic pressure of the air jet is converted into a static pressure of the same size as the pressure P 2 in the grinding chamber. A certain amount of air will be entrained from the interior of the separator, and consequently the ejector should be so dimensioned that the resulting sub-pressure in the separator corresponds to the pressure drop P 2- P 3 whereby the outflow of coarse material through the outlet 8 can take place unimpededly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP82302980A 1981-06-26 1982-06-09 Broyeur à galets vertical Withdrawn EP0068681A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8119812 1981-06-26
GB08119812A GB2100617A (en) 1981-06-26 1981-06-26 Edge-runner mill

Publications (2)

Publication Number Publication Date
EP0068681A2 true EP0068681A2 (fr) 1983-01-05
EP0068681A3 EP0068681A3 (fr) 1983-06-08

Family

ID=10522844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302980A Withdrawn EP0068681A3 (fr) 1981-06-26 1982-06-09 Broyeur à galets vertical

Country Status (6)

Country Link
EP (1) EP0068681A3 (fr)
JP (1) JPS586248A (fr)
AU (1) AU8404882A (fr)
BR (1) BR8203714A (fr)
DK (1) DK262182A (fr)
GB (1) GB2100617A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3718781A1 (de) * 1987-06-04 1988-12-15 Krupp Polysius Ag Rollenmuehle
EP0979675A1 (fr) * 1998-08-11 2000-02-16 Loesche Gmbh Procédé et installation de broyage de matières premières
RU2179888C2 (ru) * 1997-04-15 2002-02-27 Фсб Устройство для поступательной подачи материала для дробилки
WO2010012529A1 (fr) * 2008-07-30 2010-02-04 Flsmidth A/S Broyeur à cylindres pour le broyage de matière particulaire
CN101918140B (zh) * 2007-12-11 2012-10-17 Fl史密斯公司 辊磨机
CN102892510A (zh) * 2010-05-14 2013-01-23 三菱重工业株式会社 生物质粉碎装置及生物质与煤混烧系统
CN106902926A (zh) * 2017-04-26 2017-06-30 郑州大学 一种碾碎式风选机
CN118080082A (zh) * 2024-04-28 2024-05-28 佳木斯大学 一种药物原料粉碎筛分一体设备

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04101313U (ja) * 1991-02-19 1992-09-01 株式会社クラベ 雑音防止コード
JP5645469B2 (ja) * 2010-05-14 2014-12-24 三菱重工業株式会社 バイオマス粉砕装置及びバイオマス・石炭混焼システム
CN104069934B (zh) * 2014-05-04 2016-03-09 上海宝钢节能环保技术有限公司 一种立式辊磨机返料装置
JP7404919B2 (ja) * 2020-02-17 2023-12-26 株式会社Ihi 竪型ローラミル

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH150055A (de) * 1930-08-15 1931-10-15 Peters Ag Claudius Vorrichtung zum Trennen der spezifisch leichteren Bestandteile von den spezifisch schwereren eines Gemisches in Mühlen.
US2944744A (en) * 1957-08-02 1960-07-12 Berz Max Ring and roller pulverizing apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3718781A1 (de) * 1987-06-04 1988-12-15 Krupp Polysius Ag Rollenmuehle
EP0294609A3 (en) * 1987-06-04 1989-11-29 Krupp Polysius Ag Roller mill
US4909450A (en) * 1987-06-04 1990-03-20 Krupp Polysius Ag Roller mill
RU2179888C2 (ru) * 1997-04-15 2002-02-27 Фсб Устройство для поступательной подачи материала для дробилки
EP0979675A1 (fr) * 1998-08-11 2000-02-16 Loesche Gmbh Procédé et installation de broyage de matières premières
CN101918140B (zh) * 2007-12-11 2012-10-17 Fl史密斯公司 辊磨机
WO2010012529A1 (fr) * 2008-07-30 2010-02-04 Flsmidth A/S Broyeur à cylindres pour le broyage de matière particulaire
US8528844B2 (en) 2008-07-30 2013-09-10 Flsmidth A/S Roller mill with application of gas
CN102892510A (zh) * 2010-05-14 2013-01-23 三菱重工业株式会社 生物质粉碎装置及生物质与煤混烧系统
US8899163B2 (en) 2010-05-14 2014-12-02 Mitsubishi Heavy Industries, Ltd. Biomass pulverizing apparatus and biomass/coal mixed-combustion system
CN106902926A (zh) * 2017-04-26 2017-06-30 郑州大学 一种碾碎式风选机
CN118080082A (zh) * 2024-04-28 2024-05-28 佳木斯大学 一种药物原料粉碎筛分一体设备

Also Published As

Publication number Publication date
AU8404882A (en) 1983-01-06
EP0068681A3 (fr) 1983-06-08
GB2100617A (en) 1983-01-06
DK262182A (da) 1982-12-27
JPS586248A (ja) 1983-01-13
BR8203714A (pt) 1983-06-21

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): BE DE FR GB IT LU NL

PUAL Search report despatched

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Effective date: 19840516

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Inventor name: SVENSSON, SVEN OLE