EP0496124B1 - Roller mill - Google Patents

Roller mill Download PDF

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Publication number
EP0496124B1
EP0496124B1 EP19910122397 EP91122397A EP0496124B1 EP 0496124 B1 EP0496124 B1 EP 0496124B1 EP 19910122397 EP19910122397 EP 19910122397 EP 91122397 A EP91122397 A EP 91122397A EP 0496124 B1 EP0496124 B1 EP 0496124B1
Authority
EP
European Patent Office
Prior art keywords
classifier
cone
auxiliary
auxiliary classifier
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.)
Expired - Lifetime
Application number
EP19910122397
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0496124A1 (en
Inventor
Hirohisa C/O Nagasaki Technical Inst. Of Yoshida
Tsugio C/O Nagasaki Technical Inst. Of Yamamoto
Masaaki C/O Nagasaki Shipyard & Engine Kinoshita
Hidenori C/O Nagasaki Shipyard & Engine Sakamoto
Takeshi C/O Mitsubishi Jukogyo K. K. Kunimoto
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 EP0496124A1 publication Critical patent/EP0496124A1/en
Application granted granted Critical
Publication of EP0496124B1 publication Critical patent/EP0496124B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • 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

  • This invention relates to a roller mill for pulverizing, for example, coal to feed pulverized coal to a boiler and particularly to a roller mill as defined in the preamble of claim 1.
  • FIG. 7 designates an auxiliary classifier cone whose upper portion is made in a cylindrical shape and whose lower portion is made in an inverted truncated conical shape.
  • 14 designates rotating vanes of a rotary classifier disposed inside the auxiliary classifier cone 13, which are rotatably supported by a coal feed pipe 20.
  • 15 designates a plurality of deflector plates, 16 a pulverized-coal eject section, and 18 a mill casing.
  • each rotating vane 14 is identical in phase with respect to the direction of rotation, and the deflector plates 15 are attached to a cylindrical upper portion of the auxiliary classifier cone 13 so that individual openings 17 are formed between them.
  • 21 designates a table disposed directly under the coal feed pipe 20, and 22 a roll.
  • raw coal is caused to fall through the coal feed pipe 20 on the table 21 and is pulverized by the roll 22, and fine coal particles and coarse coal particles resulting from pulverization are moved upward between the auxiliary classifier cone 13 and the mill casing 18 by means of hot air supplied from below the mill casing 18.
  • the hot air (upward stream) carrying fine coal particles and coarse coal particles moves across an annular passage formed between an upper portion of the mill casing 18 and the cylindrical upper portion of the auxiliary classifier cone 13, and flows through the openings 17 defined between the deflector plates 15 so that it is changed to a lateral stream toward the rotary classifier.
  • coarse coal particles 6 are sprung back in the directions of the deflector plates 15 (see Figs.
  • fine coal particles 5 separated from coarse coal particles 6 are ejected together with the upward stream through the pulverised-coal eject section 16 out of the roller mill.
  • Coarse coal particles 6 sprung back in the directions of the deflector plates 15 move along the inner surface of the auxiliary classifier cone 13 and fall on the table 21 so that they are re-pulverised by the roll 22.
  • the present invention provides a roller mill comprising a rotary classifier with a plurality of rotating vanes, an auxiliary classifier cone surrounding the rotary classifier, said auxiliary classifier cone being made in an inverted conical shape, blowoff openings being provided around an upper portion of the auxiliary classifier cone, and a plurality of deflector plates being disposed at the blowoff openings in mutually spaced relation around the upper portion of the auxiliary classifier cone so that an upward stream moving upward on the outside of the auxiliary classifier cone being changed to a lateral stream toward the rotary classifier, characterized in that said auxiliary classifier cone is made in the inverted conical shape from its lower edge to its upper edge, the upper edge of said auxiliary classifier cone being attached directly to a mill casing, said blowoff openings are provided at the inclined upper portion of the auxiliary classifier cone attached directly to the mill casing, said deflector plates are bent in their upper portions for changing the upward stream to a lateral rotative stream, and each rotating vane
  • raw coal is caused to fall through a coal feed pipe on a table and pulverized by a roll, fine coal particles and coarse coal particles resulting from pulverization are moved upward between the auxiliary classifier cone and the mill casing by means of hot air supplied from below the mill casing, the hot air (upward stream) carrying fine coal particles and coarse coal particles moves across a space of triangular cross section formed between the inverted conical body of the auxiliary classifier cone and the mill casing and flows through blowoff openings defined between the deflector plates so that it is changed to a lateral rotative stream toward the rotary classifier, upon impinging on the downward-inclined rotating vanes of the rotary classifier, coarse coal particles are sprung back toward a lower portion of the auxiliary classifier cone and separated from fine coal particles, and fine coal particles separated from coarse coal particles are ejected together with the upward stream through a pulverized-coal eject pipe out of the roller mill.
  • FIG. 1 designates raw coal
  • 2 a coal feed pipe vertically disposed
  • 11 a rotary classifier
  • 10 rotating vanes of the rotary classifier, which are rotatable about the coal feed pipe 2 clockwise as viewed from above as illustrated by the arrow in Fig. 5.
  • each rotating vane 10 is designed such that its lower portion is trailing with respect to its upper portion in the direction of rotation, defining a downward-inclined rotating vane.
  • auxiliary classifier cone of inverted conical shape in general view which is disposed above the table 3, and 19 a mill casing.
  • the upper edge of the inverted conical body of the auxiliary classifier cone 7 is attached to the mill casing 19 so that a space of triangular cross section is formed between the auxiliary classifier cone 7 and the mill casing 19.
  • Figs. 1 and 3 through 6 8 designates a plurality of blowoff openings formed in an upper peripheral portion of the auxiliary classifier cone 7 as to open obliquely downward into the space of triangular cross section.
  • 9 designates a plurality of deflector plates attached to the inner surface of the upper peripheral portion of the auxiliary classifier cone 7 in mutually spaced relation, defining the blowoff openings 8.
  • the combination of blowoff openings 8 and deflector plates 9 acts to change an upward stream moving upward on the outside of the auxiliary classifier cone 7 to a lateral rotative stream toward the rotary classifier 11 in the vicinity of the upper edge of the auxiliary classifier cone 7.
  • 12 designates a pulverized-coal eject pipe provided at the top of the mill casing 19 in confronting relation to the upper end of the rotary classifier 11.
  • the operation of the roller mill shown in Figs. 1 through 6 will be described.
  • the raw coal 1 is caused to fall through the coal feed pipe 2 on the table 3 so that it is pulverized by a roll, and fine coal particles 5 and coarse coal particles 6 resulting from pulverization are moved upward between the auxiliary classifier cone 7 and the mill casing 19 by means of the hot air supplied from below the mill casing 19.
  • the hot air (upward stream) carrying fine coal particles 5 and coarse coal particles 6 moves across the space of triangular cross section formed between the auxiliary classifier cone 7 and the mill casing 19 and flows through the blowoff openings 8 defined between the deflector plates 9, so that the hot air upward stream is changed to the lateral rotative stream toward the rotary classifier 11.
  • coarse coal particles 6 are sprung back toward a lower portion of the auxiliary classifier cone 7 and separated from fine coal particles 5; on the other hand, fine coal particles 5 separated from coarse coal particles 6 are ejected together with the upward stream through the pulverized-coal eject pipe 12 out of the roller mill.
  • Table 1 lists the results of tests performed on a roller mill including the rotary classifier of the present invention and a similar one including the conventional classifier.
  • the present invention provides only a very small residual amount relating to 100 mesh (corresponding to coarse coal particles) and needs only as slow a speed as about 40 rpm for rotation of the classifier.
  • the mill pressure loss is as low as 20 to 50 mmH2O. That is, the listed results of tests will prove that the rotary classifier of the present invention has a high degree of classification performance.
  • raw coal is caused to fall through the coal feed pipe on the table and pulverized by the roll, fine coal particles and coarse coal particles resulting from pulverization are moved upward between the auxiliary classifier cone and the mill casing by means of hot air supplied from below the mill casing, the hot air (upward stream) carrying fine coal particles and coarse coal particles moves across the space of triangular cross section formed between the inverted conical body of the auxiliary classifier cone and the mill casing and flows through the blowoff openings defined between the deflector plates so that it is changed to a lateral rotative stream toward the rotary classifier, and upon impinging on the downward-inclined rotating vanes of the rotary classifier, coarse coal particles are sprung back toward a lower portion of the auxiliary classifier cone so that they are separated from fine coal particles; therefore, coarse coal particles are prevented from mixing with fine coal particles, the air stream with fine coal particles carried thereon (which is ejected through the pulverized-coal eject pipe
  • the auxiliary classifier cone is made in an inverted conical shape from its lower edge to its upper edge, the upper edge of the cone is attached directly to the mill casing, and the deflector plates are arranged in mutually spaced relation around the upper portion of the inverted conical body of the auxiliary classifier cone so that the upward stream moving upward on the outside of the auxiliary classifier cone is changed to a lateral rotative stream toward the rotary classifier in the vicinity of the upper end of the auxiliary classifier; therefore, it is not necessary to make an upper portion of the auxiliary classifier cone in a cylindrical shape as in the prior art, this allowing miniaturization of the auxiliary classifier cone and reduction of the manufacturing cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP19910122397 1991-01-21 1991-12-30 Roller mill Expired - Lifetime EP0496124B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3005330A JP2617623B2 (ja) 1991-01-21 1991-01-21 ローラミル
JP5330/91 1991-01-21

Publications (2)

Publication Number Publication Date
EP0496124A1 EP0496124A1 (en) 1992-07-29
EP0496124B1 true EP0496124B1 (en) 1995-07-12

Family

ID=11608235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910122397 Expired - Lifetime EP0496124B1 (en) 1991-01-21 1991-12-30 Roller mill

Country Status (4)

Country Link
EP (1) EP0496124B1 (es)
JP (1) JP2617623B2 (es)
DE (1) DE69111215T2 (es)
ES (1) ES2075320T3 (es)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423815C2 (de) * 1994-07-06 1996-09-26 Loesche Gmbh Mühlensichter
DE4412197A1 (de) * 1994-04-08 1995-10-19 Loesche Gmbh Verfahren und Einrichtung zum Zerkleinern von Material unterschiedlicher Körnung, insbesondere Luftstrommühle
ES2152476T3 (es) * 1996-11-15 2001-02-01 Doumet Joseph E Dipl Ing Metodo y molino de rodillos para secar y triturar material de suministro humedo.
DE19923109A1 (de) * 1999-05-19 2000-11-23 Bbp Energy Gmbh Zentrifugalsichter
DE10122644B4 (de) * 2001-05-10 2005-05-12 Loesche Gmbh Sichter
CN102784690A (zh) * 2011-05-15 2012-11-21 盐城吉达环保设备有限公司 一种外循环除铁粉磨工艺
US8820535B2 (en) * 2012-02-07 2014-09-02 Rickey E. Wark Classifier with variable entry ports
CN104128312A (zh) * 2013-05-03 2014-11-05 浙江力普粉碎设备有限公司 高速分级机
JP6275442B2 (ja) * 2013-10-01 2018-02-07 三菱日立パワーシステムズ株式会社 竪型ローラミル
JP6352162B2 (ja) 2014-11-28 2018-07-04 三菱日立パワーシステムズ株式会社 竪型ローラミル
US9675212B2 (en) 2015-02-03 2017-06-13 Sharkninja Operating Llc Container for food processing system
JP6629605B2 (ja) 2016-01-27 2020-01-15 三菱日立パワーシステムズ株式会社 分級機、粉砕分級装置及び微粉炭焚きボイラ
DE102016121925A1 (de) * 2016-11-15 2018-05-17 Neuman & Esser Gmbh Mahl- Und Sichtsysteme Sichter, Mühle und Verfahren zum Sichten eines Gas-Feststoff-Gemischs
US10744534B2 (en) * 2016-12-02 2020-08-18 General Electric Technology Gmbh Classifier and method for separating particles
KR102373386B1 (ko) * 2021-10-21 2022-03-11 유일테크주식회사 동적분류기
CN114803321B (zh) * 2022-04-26 2024-05-17 安徽理工大学 一种煤矿开采用矿用传送带

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448417A (fr) * 1965-09-18 1966-08-05 Rheinische Kalksteinwerke Tamiseur à air
DE1938772C3 (de) * 1969-07-30 1980-06-12 Krupp Polysius Ag, 4720 Beckum Walzmuhle
DD153469A3 (de) * 1980-07-04 1982-01-13 Winfried Raatz Luftstromsichter
JPS6268554A (ja) * 1985-09-20 1987-03-28 川崎重工業株式会社 竪型粉砕機の運転制御方法
DE3801229A1 (de) * 1988-01-18 1989-07-27 Krupp Polysius Ag Mahlverfahren sowie mahlanlage
JPH0636871B2 (ja) * 1988-03-25 1994-05-18 宇部興産株式会社 竪型粉砕機
US4981269A (en) * 1988-11-18 1991-01-01 Ube Industries, Ltd. Vertical mill
DE4002867C1 (es) * 1990-02-01 1991-08-29 Evt Energie- Und Verfahrenstechnik Gmbh, 7000 Stuttgart, De

Also Published As

Publication number Publication date
DE69111215T2 (de) 1995-11-23
DE69111215D1 (de) 1995-08-17
JP2617623B2 (ja) 1997-06-04
EP0496124A1 (en) 1992-07-29
ES2075320T3 (es) 1995-10-01
JPH04235755A (ja) 1992-08-24

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