EP0141982A2 - Pulverisiermühle mit reiner Walzbewegung zwischen Walze und Mahlschüssel - Google Patents

Pulverisiermühle mit reiner Walzbewegung zwischen Walze und Mahlschüssel Download PDF

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Publication number
EP0141982A2
EP0141982A2 EP84111398A EP84111398A EP0141982A2 EP 0141982 A2 EP0141982 A2 EP 0141982A2 EP 84111398 A EP84111398 A EP 84111398A EP 84111398 A EP84111398 A EP 84111398A EP 0141982 A2 EP0141982 A2 EP 0141982A2
Authority
EP
European Patent Office
Prior art keywords
bowl
roll
point
grinding
axis
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Withdrawn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
EP84111398A
Other languages
English (en)
French (fr)
Other versions
EP0141982A3 (de
Inventor
John Andrew Makuch
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 Inc
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 Combustion Engineering Inc filed Critical Combustion Engineering Inc
Publication of EP0141982A2 publication Critical patent/EP0141982A2/de
Publication of EP0141982A3 publication Critical patent/EP0141982A3/de
Withdrawn legal-status Critical Current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
    • B02C15/04—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
    • 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
    • B02C15/003—Shape or construction of discs or rings
    • 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
    • B02C15/004—Shape or construction of rollers or balls

Definitions

  • One means of burning coal in the furnace of a steam generator is to grind the coal to a flour-like consistency, transport it to the furnace in an airstream, and burn it in suspension.
  • One means of pulverizing the coal is in a pulverizing mill, where the coal is ground between a rotating grinding bowl and one or more coacting, grinding rolls. Because of the nature of the coal, and particularly hard impurities contained therein, such as small amounts of mineral matter, the outer surfaces of the bowl and rolls are subject to heavy wear, necessitating replacement of the parts on a regular basis. Much time and effort has been expended in attempting to increase the time span between replacement of the bowl and rolls of the pulverizing mill.
  • a pulverizing mill having a grinding bowl mounted for rotation about a central axis, and also having a frustoconical grinding roll, the outer surface of which is in parallel relationship with the grinding surface of the bowl.
  • the bowl and roll are constructed such that the ratio of the horizontal radial distance from the axis of the bowl to the surface of the roll, where it lies adjacent to the bowl surface, compared to the radius of that point from the axis about which the roll rotates, is a constant ratio over the whole length of the roll from its inner diameter to its outer diameter.
  • the roll and bowl liners are contoured to achieve this relationship.
  • a pulverizing bowl mill 10 Inside the housing 11 is positioned a rotatable bowl or ring 12, mounted on shaft 14. The shaft 14 along with the attached bowl is rotated by means of worm wheel 18, which engages worm 16 mounted on a motor driven shaft.
  • One or more grinding elements or rollers 20 are rotatably mounted on shafts 22. Generally there are three rollers equidistantly spaced apart. Adjustable hydraulic loading urges the roller 20 towards the inner surface of the grinding ring 12, by acting against rod 24, by exerting a force on arm 23.
  • the roll 20 is pivotally mounted on trunnion shaft 25.
  • a stop member 26 prevents the roll from actually coming into contact with the grinding surface of the bowl. Such metal- to-metal contact would cause rapid wear of the surfaces.
  • the stop 26 is set to leave a very small gap between these two grinding surfaces.
  • Coal is introduced into the mill through inlets 36. Air enters through opening 27, and flows upwardly through the annular space 32 to convey the ground material passing over the lip upwardly through the mill interior and into the classifer 30. The air and coal enter the classifier through inlets 28. The larger particles of insufficiently ground coal fall back onto the grinding surface through bottom opening 34 for further grinding, and the finer particles are carried along by the air and are discharged through outlet 38.
  • the surface of the bowl on which the grinding takes place is at an angle to the horizontal. This is to enable the coal particles to have some retention time within the bowl, so that they will be subjected to grinding action between the three rolls and the bowl.
  • the lip 40 also aids in giving the coal particles retention time before they are flung off the bowl into the annular space 32 to be picked up by the airstream.
  • Minimum wear is accomplished by making the ratio of the horizontal radial distance from the axis of the bowl to the lower, inner end of the roll where it lies adjacent to the bowl surface, compared to the radius of that point from the axis about which the roll rotates, equal to the ratio of the horizontal radial distance from the axis of the bowl to the upper end of the roll at the point where it lies adjacent to the bowl surface, compared to the radius of that point from the axis about which the roll rotates. 0r, in other words,- .
  • This s relationship exists when the extension of the line 50 on which the bowl grinding surface lies, intersects the extension 52 of the roll axis, at the axis 54 of the shaft 14.
EP84111398A 1983-10-24 1984-09-25 Pulverisiermühle mit reiner Walzbewegung zwischen Walze und Mahlschüssel Withdrawn EP0141982A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54434583A 1983-10-24 1983-10-24
US544345 1983-10-24

Publications (2)

Publication Number Publication Date
EP0141982A2 true EP0141982A2 (de) 1985-05-22
EP0141982A3 EP0141982A3 (de) 1986-02-26

Family

ID=24171795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111398A Withdrawn EP0141982A3 (de) 1983-10-24 1984-09-25 Pulverisiermühle mit reiner Walzbewegung zwischen Walze und Mahlschüssel

Country Status (6)

Country Link
EP (1) EP0141982A3 (de)
JP (1) JPS6094151A (de)
KR (1) KR850003338A (de)
AU (1) AU3460784A (de)
ES (1) ES536784A0 (de)
ZA (1) ZA848241B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009015037A1 (de) * 2009-03-26 2010-11-18 Loesche Gmbh Wälzmühle
KR20190021319A (ko) * 2016-06-21 2019-03-05 제네럴 일렉트릭 테크놀러지 게엠베하 미분쇄기를 업그레이드하기 위한 시스템, 방법 및 장치

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100660569B1 (ko) * 2005-12-15 2006-12-22 한국남동발전 주식회사 분쇄기의 롤러 및 회전판의 보수 방법
CN106345572B (zh) * 2016-11-09 2019-04-12 厦门金邦达实业有限责任公司 一种磨煤机的分体式磨碗

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB428237A (en) * 1933-11-20 1935-05-09 Josephus Wass Improvements in or relating to grinding, crushing and mixing mills
US3962966A (en) * 1975-01-13 1976-06-15 Domtar Limited Chip crusher

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB428237A (en) * 1933-11-20 1935-05-09 Josephus Wass Improvements in or relating to grinding, crushing and mixing mills
US3962966A (en) * 1975-01-13 1976-06-15 Domtar Limited Chip crusher

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009015037A1 (de) * 2009-03-26 2010-11-18 Loesche Gmbh Wälzmühle
DE102009015037B4 (de) * 2009-03-26 2011-03-31 Loesche Gmbh Wälzmühle
CN102369060A (zh) * 2009-03-26 2012-03-07 勒舍有限公司 辊磨机
US8556202B2 (en) 2009-03-26 2013-10-15 Loesche Gmbh Roller grinding mill
CN102369060B (zh) * 2009-03-26 2013-12-11 勒舍有限公司 辊磨机
KR20190021319A (ko) * 2016-06-21 2019-03-05 제네럴 일렉트릭 테크놀러지 게엠베하 미분쇄기를 업그레이드하기 위한 시스템, 방법 및 장치

Also Published As

Publication number Publication date
JPS6094151A (ja) 1985-05-27
ES8602445A1 (es) 1985-12-01
AU3460784A (en) 1985-05-09
EP0141982A3 (de) 1986-02-26
KR850003338A (ko) 1985-06-17
ZA848241B (en) 1985-06-26
ES536784A0 (es) 1985-12-01

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Withdrawal date: 19860228

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Inventor name: MAKUCH, JOHN ANDREW