EP0496124A1 - Roller mill - Google Patents

Roller mill Download PDF

Info

Publication number
EP0496124A1
EP0496124A1 EP19910122397 EP91122397A EP0496124A1 EP 0496124 A1 EP0496124 A1 EP 0496124A1 EP 19910122397 EP19910122397 EP 19910122397 EP 91122397 A EP91122397 A EP 91122397A EP 0496124 A1 EP0496124 A1 EP 0496124A1
Authority
EP
European Patent Office
Prior art keywords
coal particles
classifier
cone
auxiliary
auxiliary classifier
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
EP19910122397
Other languages
German (de)
French (fr)
Other versions
EP0496124B1 (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
Priority to JP5330/91 priority Critical
Priority to JP3005330A priority patent/JP2617623B2/en
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

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00Auxiliary 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
    • B02C23/18Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24Passing gas through crushing or disintegrating zone
    • B02C23/32Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/04Mills with pressed pendularly-mounted rollers, e.g. spring pressed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING 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
    • B07B7/00Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Abstract

Raw coal (1) is caused to fall through a coal feed pipe (2) on a table (3) and pulverized by a roll, fine coal particles (5) and coarse coal particles (6) resulting from pulverization are moved upward between an auxiliary classifier cone (7) and a mill casing (19) by means of hot air (4) supplied from below the mill casing (19), the hot air (upward stream) carrying fine coal particles (5) and coarse coal particles (6) moves across a space of triangular cross section formed between the inverted conical body of the auxiliary classifier cone (7) and the mill casing (19) and flows through blowoff openings (8) defined between deflector plates (9) so that it is changed to a lateral rotative stream toward a rotary classifier (11), upon impinging on downward-inclined rotating vanes (10) of 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), and fine coal particles (5) separated from coarse coal particles (6) are ejected together with the upward stream through a pulverized-coal eject pipe (12) out of the roller mill. Coarse coal particles (6) sprung back toward the lower portion of the auxiliary classifier cone (7) move along the inner surface of the auxiliary classifier cone (7) and fall on the table (3) so that they are re-pulverized by the roll.

Description

    BACKGROUND OF THE INVENTION: Field of the Invention:
  • This invention relates to a roller mill for pulverizing, for example, coal to feed pulverized coal to a boiler.
  • Description of the Prior Art:
  • A conventional roller mill will be described with reference to Figs. 7 through 11. In Fig. 7, 13 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. In Figs. 7 through 11, 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. An upper portion and an lower portion of each rotating vane 14 are 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.
  • In this roller mill, raw coal is caused to fall through the coal feed pipe 20 on the table 21 and 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 rotative stream toward the rotary classifier. Upon impinging on the rotating vanes 14 of the rotary classifier (see Fig. 11 wherein 5 designates fine coal particles and 6 designates coarse coal particles), coarse coal particles 6 are sprung back in the directions of the deflector plates 15 (see Figs. 9 and 10) and separated from fine coal particles; 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 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-pulverized by the roll 22.
  • The conventional roller mill as shown in Figs. 7 through 11 has the following drawbacks:
    • (a) Since coarse coal particles 6 impinging on the rotating vanes 4 are sprung back in the directions of the deflector plates 15 as shown in Figs. 9 and 10, they are forced back by the air stream flowing through the openings 17 defined between the deflector plates 15 toward the rotary classifier, so that coarse coal particles 6 are mixed with the air stream carrying fine coal particles 5, resulting in a low efficiency of classification.
    • (b) Since the deflector plates 15 are attached to the cylindrical upper portion of the auxiliary classifier cone so that the openings 17 are formed between them, the annular passage must be provided around the circular array of openings 17, this demanding size enlargement of the upper portion of the auxiliary classifier cone 13 correspondingly to the cylindrical upper portion, resulting in an increase in cost. Contrarily, if the mill casing 18 were made in a straight shape, the auxiliary classifier cone 13 and the rotary classifier 11 will become small in diameter, this increasing the velocity of air flowing through them, resulting in a degradation in classification performance and an increase in pressure loss.
    SUMMARY OF THE INVENTION:
  • It is an object of the present invention to provide a roller mill which is improved in classification efficiency and reduced in manufacturing cost and pressure loss.
  • To accomplish the foregoing object, the present invention provides a roller mill comprising a rotary classifier with a plurality of rotating vanes, and an auxiliary classifier cone surrounding the rotary classifier, wherein each rotating vane of the rotary classifier being designed such that its lower portion is trailing with respect to its upper portion in the direction of rotation so as to define a downward-inclined rotating vane, the auxiliary classifier cone being made in an inverted conical shape from its lower edge to its upper edge, the upper edge of the auxiliary classifier cone being attached directly to a mill casing, and a plurality of deflector plates being disposed in mutually spaced relation around an upper portion of the inverted conical body 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 rotative stream toward the rotary classifier in the vicinity of the upper portion of the auxiliary classifier cone.
  • In the roller mill of the present invention, therefore, 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. Coarse coal particles sprung back toward the lower portion of the auxiliary classifier cone move along the inner surface of the auxiliary classifier cone and fall on the table so that they are re-pulverized by the roll.
  • BRIEF DESCRIPTION OF THE DRAWINGS:
    • Fig. 1 is a schematic sectional view showing a roller mill according to the present invention;
    • Fig. 2 is a perspective view showing an auxiliary classifier cone of the present roller mill;
    • Fig. 3 is a perspective view showing deflector plates provided in an upper portion of the present auxiliary classifier cone;
    • Fig. 4 is a perspective view showing a rotary classifier of the present roller mill;
    • Figs. 5 and 6 are diagrams showing the function of a downward-inclined rotating vane of the present rotary classifier;
    • Fig. 7 is a schematic sectional view showing a conventional roller mill;
    • Fig. 8 is a perspective view showing a rotary classifier of the conventional roller mill; and
    • Figs. 9, 10 and 11 are diagrams showing the function of a rotating vane of the conventional rotary classifier.
    DESCRIPTION OF THE PREFERRED EMBODIMENT:
  • A roller mill according to the present invention will now be described with reference to Figs. 1 through 6. In these drawings, 1 designates raw coal, 2 a coal feed pipe vertically disposed, 11 a rotary classifier, and 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. As shown 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.
  • 3 designates a table, 4 hot air, 5 fine coal particles, 6 coarse coal particles, 7 an 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.
  • In 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. Upon impinging on the downward-inclined rotating vanes 10 of the rotary classifier 11 (see Figs. 5 and 6), 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.
  • Coarse coal particles 6 sprung back toward the lower portion of the auxiliary classifier cone 7 as above move along the inner surface of the auxiliary classifier cone 7 and fall on the table 3 so that they are re-pulverized by the roll.
  • 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. As will be appreciated, for substantially the same pass amount relating to 200 mesh, 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. And, the mill pressure loss is as lower 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. Table 1
    roll mill with present classifier roll mill with conventional classifier
    test run 1-1 1-2 1-3 2-1 2-2 2-3
    classifier speed (rpm) 75 100 125 110 140 170
    200-mesh pass amount (%) 76 88 99 75 87 99
    100-mesh residual amount (%) 2.1 0.1 0.0 3.9 1.2 0.2
    mill pressure loss (mmH₂O) 310 328 356 332 367 405
  • As described above, in the roller mill of the present invention, 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) carries substantially no coarse coal particles, and thus, the efficiency of classification can be enhanced.
  • Since coarse coal particles are sprung back toward the lower portion of the auxiliary classifier cone, the air stream flowing through the openings defined between the deflector plates toward the rotary classifier is not disturbed; thus, the pressure loss can be decreased.
  • Further, 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.

Claims (3)

  1. A roller mill characterized in comprising a rotary classifier (11) with a plurality of rotating vanes (10), and an auxiliary classifier cone (7) surrounding the rotary classifier, wherein each rotating vane (10) of said rotary classifier being designed such that its lower portion is trailing with respect to its upper portion in the direction of rotation so as to define a downward-inclined rotating vane, said auxiliary classifier cone (7) being made in an 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 (19), and a plurality of deflector plates (9) being disposed in mutually spaced relation around an upper portion of the inverted conical body of the auxiliary classifier cone (7) so that an upper stream moving upward on the outside of the auxiliary classifier cone being changed to a lateral rotative stream toward the rotary classifier in the vicinity of the upper portion of the auxiliary classifier cone.
  2. A roller mill according to claim 1, wherein the rotating vanes (10) of the rotary classifier (11) are rotatable about a coal feed pipes (2) vertically disposed.
  3. A roller mill according to claim 1 or 2, wherein a pulverized-coal eject pipe (12) is provided at the top of the mill casing (19) in confronting relation to the upper end of the rotary classifier (11).
EP19910122397 1991-01-21 1991-12-30 Roller mill Expired - Lifetime EP0496124B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP5330/91 1991-01-21
JP3005330A JP2617623B2 (en) 1991-01-21 1991-01-21 Roller mill

Publications (2)

Publication Number Publication Date
EP0496124A1 true EP0496124A1 (en) 1992-07-29
EP0496124B1 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 (en)
JP (1) JP2617623B2 (en)
DE (1) DE69111215T2 (en)
ES (1) ES2075320T3 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423815A1 (en) * 1994-07-06 1996-01-18 Loesche Gmbh Mill classifier
EP0842702A1 (en) * 1996-11-15 1998-05-20 Joseph E. Dipl.-Ing. Doumet Method and roll mill for drying and grinding moist feed material
CN1049613C (en) * 1994-04-08 2000-02-23 勒舍有限公司 Method and apparatus for crushing material of different grain size
EP1053797A2 (en) * 1999-05-19 2000-11-22 BBP Energy GmbH Centrifugal separator
WO2002090004A1 (en) * 2001-05-10 2002-11-14 Loesche Gmbh Separator
CN102784690A (en) * 2011-05-15 2012-11-21 盐城吉达环保设备有限公司 External-circulation iron-removing grinding technology
WO2013119257A1 (en) * 2012-02-07 2013-08-15 Wark Rickey E Classifier with variable entry ports
CN104128312A (en) * 2013-05-03 2014-11-05 浙江力普粉碎设备有限公司 High-speed classifier
CN107847984A (en) * 2016-01-27 2018-03-27 三菱日立电力系统株式会社 Grader, crushing and classification device and fine coal incinerator
WO2018099998A1 (en) * 2016-12-02 2018-06-07 General Electric Technology Gmbh A classifier and method for separating particles
CN109952161A (en) * 2016-11-15 2019-06-28 诺曼艾索工艺技术有限公司 Screening machine, grinding machine and the method for sieving gas-solid mixture
US10722899B2 (en) 2014-11-28 2020-07-28 Mitsubishi Hitachi Power Systems, Ltd. Vertical roller mill

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6275442B2 (en) * 2013-10-01 2018-02-07 三菱日立パワーシステムズ株式会社 Vertical roller mill
US9675212B2 (en) 2015-02-03 2017-06-13 Sharkninja Operating Llc Container for food processing system
KR102373386B1 (en) * 2021-10-21 2022-03-11 유일테크주식회사 Dynamic classifier

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448417A (en) * 1965-09-18 1966-08-05 Rheinische Kalksteinwerke Air sieve
DE1938772A1 (en) * 1969-07-30 1971-02-11 Polysius Ag Waelzmuehle
DE3125850A1 (en) * 1980-07-04 1982-04-15 VEB Schwermaschinenbau Kombinat "Ernst Thälmann" Magdeburg, DDR 3011 Magdeburg Air-suspension classifier
EP0325770A2 (en) * 1988-01-18 1989-08-02 Krupp Polysius Ag Grinding method and arrangement
US4981269A (en) * 1988-11-18 1991-01-01 Ube Industries, Ltd. Vertical mill
DE4002867C1 (en) * 1990-02-01 1991-08-29 Evt Energie- Und Verfahrenstechnik Gmbh, 7000 Stuttgart, De

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6268554A (en) * 1985-09-20 1987-03-28 Kawasaki Heavy Ind Ltd Method of controlling operation of vertical type crusher
JPH0636871B2 (en) * 1988-03-25 1994-05-18 宇部興産株式会社 Vertical crusher

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448417A (en) * 1965-09-18 1966-08-05 Rheinische Kalksteinwerke Air sieve
DE1938772A1 (en) * 1969-07-30 1971-02-11 Polysius Ag Waelzmuehle
DE3125850A1 (en) * 1980-07-04 1982-04-15 VEB Schwermaschinenbau Kombinat "Ernst Thälmann" Magdeburg, DDR 3011 Magdeburg Air-suspension classifier
EP0325770A2 (en) * 1988-01-18 1989-08-02 Krupp Polysius Ag Grinding method and arrangement
US4981269A (en) * 1988-11-18 1991-01-01 Ube Industries, Ltd. Vertical mill
DE4002867C1 (en) * 1990-02-01 1991-08-29 Evt Energie- Und Verfahrenstechnik Gmbh, 7000 Stuttgart, De

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1049613C (en) * 1994-04-08 2000-02-23 勒舍有限公司 Method and apparatus for crushing material of different grain size
DE4423815A1 (en) * 1994-07-06 1996-01-18 Loesche Gmbh Mill classifier
US5622321A (en) * 1994-07-06 1997-04-22 Loesche Gmbh Mill classifier
CN1051943C (en) * 1994-07-06 2000-05-03 勒舍有限公司 Mill classifier
EP0842702A1 (en) * 1996-11-15 1998-05-20 Joseph E. Dipl.-Ing. Doumet Method and roll mill for drying and grinding moist feed material
EP1053797A2 (en) * 1999-05-19 2000-11-22 BBP Energy GmbH Centrifugal separator
EP1053797A3 (en) * 1999-05-19 2001-01-17 BBP Energy GmbH Centrifugal separator
WO2002090004A1 (en) * 2001-05-10 2002-11-14 Loesche Gmbh Separator
CN102784690A (en) * 2011-05-15 2012-11-21 盐城吉达环保设备有限公司 External-circulation iron-removing grinding technology
WO2013119257A1 (en) * 2012-02-07 2013-08-15 Wark Rickey E Classifier with variable entry ports
CN104128312A (en) * 2013-05-03 2014-11-05 浙江力普粉碎设备有限公司 High-speed classifier
US10722899B2 (en) 2014-11-28 2020-07-28 Mitsubishi Hitachi Power Systems, Ltd. Vertical roller mill
CN107847984A (en) * 2016-01-27 2018-03-27 三菱日立电力系统株式会社 Grader, crushing and classification device and fine coal incinerator
CN109952161A (en) * 2016-11-15 2019-06-28 诺曼艾索工艺技术有限公司 Screening machine, grinding machine and the method for sieving gas-solid mixture
CN109952161B (en) * 2016-11-15 2022-05-31 诺曼艾索工艺技术有限公司 Sieving machine, grinder and method for sieving gas-solid mixture
WO2018099998A1 (en) * 2016-12-02 2018-06-07 General Electric Technology Gmbh A classifier and method for separating particles
US20180154395A1 (en) * 2016-12-02 2018-06-07 General Electric Technology Gmbh Classifier and method for separating particles
CN110022995A (en) * 2016-12-02 2019-07-16 通用电器技术有限公司 For separating the clasfficiator and method of particle
US10744534B2 (en) 2016-12-02 2020-08-18 General Electric Technology Gmbh Classifier and method for separating particles

Also Published As

Publication number Publication date
ES2075320T3 (en) 1995-10-01
EP0496124B1 (en) 1995-07-12
DE69111215T2 (en) 1995-11-23
JP2617623B2 (en) 1997-06-04
JPH04235755A (en) 1992-08-24
DE69111215D1 (en) 1995-08-17

Similar Documents

Publication Publication Date Title
EP0496124A1 (en) Roller mill
US4597537A (en) Vertical mill
US5957300A (en) Classifier vane for coal mills
KR101159152B1 (en) Classification device, standing pulverizer using the classification device, and coal burning boiler apparatus
US5251831A (en) Roller mill
US4684069A (en) Classifier and controller for vertical mill
WO2010017865A2 (en) Process for sifting a mixture of a milled material and a fluid, and mill sifter
US6902126B2 (en) Hybrid turbine classifier
EP0507983B1 (en) A pulverizer mill with a rotating throat/air port ring assembly
US4818376A (en) Leakage prevention apparatus for a classifier
US5819947A (en) Classifier cage for rotating mill pulverizers
US5094391A (en) Pneumatic classifier
CA2067840A1 (en) Ultrafine Grinding Mill of Which Fed Material Flows Down Through an Agitated Bed Composed of Small Grinding Medium
US7673827B2 (en) Bowl mill for a coal pulverizer with an air mill for primary entry of air
US5657877A (en) Rotary classifier for a roller mill
JPH10109045A (en) Vertical roller mill
CN108698088B (en) System, method and apparatus for controlling flow distribution of solid particles
JPH0751629A (en) Classifier for vertical roller mill
US2214832A (en) Pulverizer
JP2005262147A (en) Powder classifying apparatus
JP4562871B2 (en) Classifier and vertical mill
JP2742066B2 (en) Rotary classifier fine crusher
JP2839116B2 (en) Vertical crusher
US5190227A (en) Beater mill with integrated centrifugal classifier
US2762573A (en) Air-swept pulverizers

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19920127

AK Designated contracting states

Kind code of ref document: A1

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

17Q First examination report despatched

Effective date: 19930628

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

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

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

REF Corresponds to:

Ref document number: 69111215

Country of ref document: DE

Date of ref document: 19950817

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2075320

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20021204

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20021210

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20021224

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20021227

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030109

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20030121

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20030218

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031230

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031231

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031231

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031231

BERE Be: lapsed

Owner name: *MITSUBISHI JUKOGYO K.K.

Effective date: 20031231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040701

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040701

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20031230

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040831

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20040701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20031231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051230