EP0107044A2 - Anneau de broyage pour broyeur de charbon - Google Patents

Anneau de broyage pour broyeur de charbon Download PDF

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Publication number
EP0107044A2
EP0107044A2 EP83109386A EP83109386A EP0107044A2 EP 0107044 A2 EP0107044 A2 EP 0107044A2 EP 83109386 A EP83109386 A EP 83109386A EP 83109386 A EP83109386 A EP 83109386A EP 0107044 A2 EP0107044 A2 EP 0107044A2
Authority
EP
European Patent Office
Prior art keywords
bull ring
ring
coal
coal pulverizer
bull
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.)
Granted
Application number
EP83109386A
Other languages
German (de)
English (en)
Other versions
EP0107044A3 (en
EP0107044B1 (fr
Inventor
Theodore Vincent Maliszewski, Jr.
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
Lummus Crest SARL
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 Lummus Crest SARL, Combustion Engineering Inc filed Critical Lummus Crest SARL
Publication of EP0107044A2 publication Critical patent/EP0107044A2/fr
Publication of EP0107044A3 publication Critical patent/EP0107044A3/en
Application granted granted Critical
Publication of EP0107044B1 publication Critical patent/EP0107044B1/fr
Expired 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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • 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

Definitions

  • the present invention relates to the formation of a bull ring having a ductile base and a surface layer with high abrasion resistance. More particularly, the invention relates to a bull ring having a unitary body of high ductility overlayed with an alloy of chromium and carbide forming a contact surface which is highly abrasive resistant.
  • U. S. Patents 2,848,170 and 3,138,337 are selected as representing the terminology and technology of the art of the present invention. Both disclosures illustrate the housing for a bowl mill in which a rotating table is powered by a vertical shaft. Grinding elements in the form of rolls are forced down upon the upper surface of the rotating table by springs, or hydraulic pressure, and coal is fed between the rolls and table surfaces for reducing the size of the coal. Air under pressure is introduced to the housing to remove the coal pulverized to a predetermined size. Routing is provided to regrind that coal not reduced to the desired size.
  • the table, or bowl has its upper surface provided with a working area by a so-called "bull ring".
  • the bull ring structure provides a track which interfaces directly with the surface of the rolls forced downward to bring the surfaces into engagement.
  • the bull ring is exposed to the severe wear of abrasion resulting from crushing or pulverizing coal particles against the roll surface.
  • the art has a long history of concern with the problems and their solutions relating to these bull ring bodies and the surfaces they provide.
  • the bull ring At some point in the early development of the bull ring, it was forged as a unitary body from steel. The strength and ductility of the forged steel bull ring was satisfactory, but its resistance to the wear of abrasion was not.
  • the art moved toward the use of Ni-hard for the single-piece bull ring to improve the resistance to abrasion.
  • Ni-hard is a material well-known to the art as an alloy characterized by its high nickel content.
  • the single-piece Ni-hard bull ring was satisfactorily resistant to the wear of abrasion, but, unfortunately, proved to be unsatisfactorily brittle and, therefore, subject to breakage from fit-up problems.
  • the present invention contemplates a unitary body of ductile cast steel in the form of a bull ring which is overlayed with an abrasion-resistant alloy.
  • the invention further contemplates the alloy for the abrasion-resistant surface of the bull ring containing 27.5% chromium, 4.8% carbon, 6.3% manganese and 1.6% silica.
  • the invention further contemplates the surface alloy bonded to the upper surface of the cast steel bull ring by deposit thereon as welding strip material, or being powdered and sintered.
  • the rotated bowl, or table, of a coal pulverizing mill is providedwithasurface to come into direct contact with the balls, or rolls, which can stand up to the severe service of directly reducing solid coal to the desired size.
  • the surface is provided by a separate grinding ring colloquially referred to as a bull ring.
  • this grinding, or bull ring is in the order of 100" in outside diameter, and provided with a track in the order of 20" wide for direct contact with the rolls.
  • the ground coal, pulverized to the desired size is air-lifted out of the mill.
  • the systems for feeding, recirculating, and air-lifting this solid fuel will not be described in detail.
  • the invention is disclosed as embodied in the construction of the bull ring which is clamped to the rotating table. It is not necessary to disclose the structure with which the bull ring is clamped to the upper surface of the rotating table.
  • the mill has a housing 1 with internal frame members on which is mounted a motor connected to a pinion gear 2 engaging the gears of a vertical shaft 3 on the upper end of which is mounted a bowl, or table 4.
  • a roll 5 is here disclosed as mounted on a trunnion so that the roll may be forced down upon the surface provided by the table 4.
  • a shoot 6 connects with an outside source of coal to direct the coal from the source to the center of table 4.
  • This solid fuel to be pulverized is centrifugally thrown between the surface of the roll and the surface provided by the invention on the table 4.
  • air entering port 10 is directed upward to lift the particles of coal into exit duct 11.
  • the invention is embodied in the bull ring 12 which is clamped to the upper surface of the rotating table 4.
  • the mating surfaces of the ring and table are fitted with great precision in order that the tremendous pressure of the roll 5 will not overflex the body of the ring and cause its fracture.
  • the basic body of the ring 12 is formed of cast steel in order to provide ductility required of this body, while the upper surface of the ring is provided with an abrasive-resistant material which can withstand the severe service of grinding coal between it and the roll surface.
  • Fig. 2 is simply the bull ring 12 sectioned to disclose a precise relationship between the base of the ring and the overlay material on its upper surface.
  • Base 15 is the cast steel body whose undersurface 16 mates with the upper surface of table 4. On the upper surface of this base 15 there is deposited the abrasion-resistant material which, together with the base, form the unique combination of the invention.
  • the present invention is in the structure of the ring 12 and not the process with which it is formed.
  • the cast steel base 15 has its upper surface covered with an alloy 17 which is preferably 27.5% chromium, 4.8% carbon, 6.3% manganese, and 1.5% silica.
  • This material 17 may be deposited by welding it to the upper surface of the base 15, or it may be sintered thereon in powdered form. However deposited, the material is formed as illustrated in Fig. 2 with a surface 18 angled to mate with the surface of the roll.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Disintegrating Or Milling (AREA)
EP83109386A 1982-10-22 1983-09-21 Anneau de broyage pour broyeur de charbon Expired EP0107044B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43608982A 1982-10-22 1982-10-22
US436089 1982-10-22

Publications (3)

Publication Number Publication Date
EP0107044A2 true EP0107044A2 (fr) 1984-05-02
EP0107044A3 EP0107044A3 (en) 1986-03-12
EP0107044B1 EP0107044B1 (fr) 1989-02-01

Family

ID=23731069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109386A Expired EP0107044B1 (fr) 1982-10-22 1983-09-21 Anneau de broyage pour broyeur de charbon

Country Status (9)

Country Link
EP (1) EP0107044B1 (fr)
JP (1) JPS5992038A (fr)
KR (1) KR840006296A (fr)
AU (1) AU567696B2 (fr)
CA (1) CA1235105A (fr)
DE (1) DE3379103D1 (fr)
ES (1) ES526537A0 (fr)
IN (1) IN157719B (fr)
ZA (1) ZA836264B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234026A2 (fr) * 1986-02-24 1987-09-02 Combustion Engineering, Inc. Articles, dont la surface est pourvue d'une couche en matière résistant à l'usure, et leur procédé de fabrication
WO2013166179A1 (fr) * 2012-05-01 2013-11-07 Innovative Combustion Technologies, Inc. Système de protection de broyeur pulvérisateur
US9604226B2 (en) 2012-05-01 2017-03-28 Innovative Combustion Technologies, Inc. Pulverizer mill protection system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100382575B1 (ko) * 2000-09-27 2003-05-01 이영진 미분기의 롤타이어 재생방법 및 재생롤타이어
KR100660569B1 (ko) * 2005-12-15 2006-12-22 한국남동발전 주식회사 분쇄기의 롤러 및 회전판의 보수 방법
KR100799294B1 (ko) * 2007-10-05 2008-01-30 어드벤스드레곤(주) 화력발전소 석탄분쇄용 미분기 화재 감지장치
CN103468990B (zh) * 2013-09-18 2016-03-09 胡力 用于生产钒氮合金的坯料的生产线

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848170A (en) * 1953-07-24 1958-08-19 Combustion Eng Wear compensating means for pulverizing mills of the ring-roller type
US3138337A (en) * 1963-03-26 1964-06-23 Combustion Eng Pulverizing bowl mill utlizing a segmented bull ring
US3186650A (en) * 1961-04-13 1965-06-01 Int Nickel Co Duplex mill liners
US3355264A (en) * 1965-02-03 1967-11-28 Canada Iron Foundries Ltd Composite impact and abrasion resistant material
DE1507580A1 (de) * 1966-05-20 1969-04-03 Loesche Kg Verschleissteil,insbesondere Mahlringsegment fuer Waelzmuehlen,Walzenmuehlen,Federrollenmuehlen u.dgl.
FR2492275A1 (fr) * 1980-10-21 1982-04-23 Genot Francois Marteaux de broyage pour broyeurs a ordures menageres

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA844074B (en) * 1983-05-30 1986-04-30 Vickers Australia Ltd Abrasion resistant materials

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848170A (en) * 1953-07-24 1958-08-19 Combustion Eng Wear compensating means for pulverizing mills of the ring-roller type
US3186650A (en) * 1961-04-13 1965-06-01 Int Nickel Co Duplex mill liners
US3138337A (en) * 1963-03-26 1964-06-23 Combustion Eng Pulverizing bowl mill utlizing a segmented bull ring
US3355264A (en) * 1965-02-03 1967-11-28 Canada Iron Foundries Ltd Composite impact and abrasion resistant material
DE1507580A1 (de) * 1966-05-20 1969-04-03 Loesche Kg Verschleissteil,insbesondere Mahlringsegment fuer Waelzmuehlen,Walzenmuehlen,Federrollenmuehlen u.dgl.
FR2492275A1 (fr) * 1980-10-21 1982-04-23 Genot Francois Marteaux de broyage pour broyeurs a ordures menageres

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234026A2 (fr) * 1986-02-24 1987-09-02 Combustion Engineering, Inc. Articles, dont la surface est pourvue d'une couche en matière résistant à l'usure, et leur procédé de fabrication
EP0234026A3 (fr) * 1986-02-24 1988-05-18 Combustion Engineering, Inc. Articles, dont la surface est pourvue d'une couche en matière résistant à l'usure, et leur procédé de fabrication
WO2013166179A1 (fr) * 2012-05-01 2013-11-07 Innovative Combustion Technologies, Inc. Système de protection de broyeur pulvérisateur
US9421551B2 (en) 2012-05-01 2016-08-23 Innovative Combustion Technologies, Inc. Pulverizer mill protection system
US9604226B2 (en) 2012-05-01 2017-03-28 Innovative Combustion Technologies, Inc. Pulverizer mill protection system

Also Published As

Publication number Publication date
CA1235105A (fr) 1988-04-12
AU2049183A (en) 1984-05-03
ZA836264B (en) 1984-04-25
JPS5992038A (ja) 1984-05-28
IN157719B (fr) 1986-05-24
ES8503525A1 (es) 1985-03-01
KR840006296A (ko) 1984-11-29
AU567696B2 (en) 1987-12-03
EP0107044A3 (en) 1986-03-12
EP0107044B1 (fr) 1989-02-01
ES526537A0 (es) 1985-03-01
DE3379103D1 (en) 1989-03-09

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