EP0988894B1 - Schaufelkranz für Luftstrom-Wälzmühlen - Google Patents

Schaufelkranz für Luftstrom-Wälzmühlen Download PDF

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Publication number
EP0988894B1
EP0988894B1 EP99117648A EP99117648A EP0988894B1 EP 0988894 B1 EP0988894 B1 EP 0988894B1 EP 99117648 A EP99117648 A EP 99117648A EP 99117648 A EP99117648 A EP 99117648A EP 0988894 B1 EP0988894 B1 EP 0988894B1
Authority
EP
European Patent Office
Prior art keywords
blade ring
polygon
guide blades
blade
ring according
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
EP99117648A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0988894A3 (de
EP0988894A2 (de
Inventor
Michael Dipl.-Ing. Keyssner
Thomas Dipl.-Ing. Letsch
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.)
Loesche GmbH
Original Assignee
Loesche GmbH
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Filing date
Publication date
Application filed by Loesche GmbH filed Critical Loesche GmbH
Publication of EP0988894A2 publication Critical patent/EP0988894A2/de
Publication of EP0988894A3 publication Critical patent/EP0988894A3/de
Application granted granted Critical
Publication of EP0988894B1 publication Critical patent/EP0988894B1/de
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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface

Definitions

  • the invention relates to a blade ring for airflow roller mills according to the preamble of claim 1.
  • Airflow roller mills, bowl mills or vertical airflow mills have arranged on a rotatable grinding bowl and grinding rollers rotatable about a fixed axis on. Between the grinding bowl and the mill housing an annular space is formed, in which essentially radially aligned guide vanes for guiding an ascending Carrier gas flow, e.g. an air flow with which the ground good is a sifter is fed.
  • the annular space is designed as a circular ring and is arranged with the.
  • Guide vanes as Blade ring sometimes referred to as a nozzle ring.
  • Known blade rings each consist of a rolled one cylindrical or conical outer ring and inner ring or from a combination of a conical exterior or Inner ring and a cylindrical inner or outer ring, between which the guide vanes are arranged.
  • the Guide vanes form flow channels, which are usually have a rectangular cross section.
  • shovel rings are also shovel rings known as a cast construction.
  • the known blade rings are relatively expensive to manufacture connected. With large roller mills, which Blade rings can have an outer diameter of up to 7 m, are also difficult to transport and assemble master and complex. It is known the shovel rings therefore segment and the individual segments or assemble circular ring sectors on site. The segmentation however requires an annealing treatment so that the Ring construction is relaxed and separating cuts to manufacture no deformation, especially none of the segments Jump up, evoke.
  • Another disadvantage of the known Blade rings is that an optimization of the Grinding and classifying process over the flow direction of the Fluid introduced into the grinding chamber via the blade ring and the two-phase mixture fed to a classifier the fluid and the regrind particles without removing the blade ring and installation of a blade ring with a modified The individual guide vanes cannot be inclined is.
  • a blade ring according to the preamble of claim 1 is disclosed in US 4,084,754 A.
  • this blade ring is not on the circumference of the grinding plate, but arranged in the area of a canoe below a classifier and serves to influence the regrind visible area in the area of the classifier.
  • the invention has for its object to provide a blade ring for airflow roller mills and comparable mills, which allows optimization of the grinding and classifying process, in particular during the operation of the mill, with a relatively simple structural design.
  • a basic idea is a blade ring to be provided with pivotable guide vanes.
  • pivoting the guide vanes and with a swivel angle adapted to the respective requirements can be fixed, there is a possibility that Flow direction of the grinding chamber through the blade ring to optimize supplied fluids or carrier gas and the Flow direction of the two-phase mixture from the fluid and to influence the regrind particles in the grinding visible area of the mill.
  • Optimizing the grinding and Visual processes of a mill via a variable guide blade inclination is without a costly expansion of a Bucket ring and installation of a new bucket ring with changed bucket inclination possible.
  • the guide vanes are expedient with their pivot axis on the outer ring or an outer jacket of the blade ring pivotally attached and can be via a Mechanism accessible from the outside. It is therefore no interruption of the mill operation necessary to change the direction of flow via a changed inclination of the guide vanes of the fluid and the fluid-regrind mixture to change.
  • the guide blades of the blade ring which is an outer shell or outer ring and one inner jacket or an inner ring or an outer ring and have an outer surface of the grinding bowl as the inner ring can be pivoted in a swivel range, which from a swivel angle ⁇ of about 30 ° to 150 ° is formed.
  • the swivel angle ⁇ is one Horizontal related, which by the pivot axis of the Guide vanes is placed and parallel to the associated one Flow surface of the blade ring runs.
  • outer jacket ring hereinafter simplified as the outer ring referred to
  • inner jacket ring hereinafter referred to as “inner ring”
  • the pivotable guide vanes with each adjustable Swivel angle as narrow a gap to the adjacent Form wall surfaces, in particular to the outer ring.
  • the Bucket ring made of a variety of polygon segments, which are flat and not curved and one closed polygon (polygon).
  • polygon polygon
  • Such one Polygon blade ring in segment shape is compared to the well-known shovel rings, which only after their manufacture into individual segments and on site be reassembled, and also compared to that segmented blade ring with horizontally adjustable Outer ring segments much more advantageous in terms of Manufacture, transport, assembly and especially in relation on influencing the grinding and vision processes with the help pivotable guide vanes for changing the flow direction of the fluid-regrind mixture.
  • the polygon blade ring in segment shape has one in particular advantageous training a polygonal outer ring with a variety of outer polygon segments, whose Number and dimensioning according to the size of the Blade ring or the mill and depending on the Length and the predefinable pivot angle of the pivotable Guide vanes can be determined.
  • the pivot angle determines one or several guide vanes in the area of an outer polygon segment its minimum length, the length of the outer polygon segments the tendons or the connecting lines between those lying on a circle surrounding the polyon Points of the polygon. It will be an inexpensive one Production of the blade ring designed as a polygon or the outer ring in segment form, because the Outside polygon segments and possibly also inside polygon segments from flat sheets and through a multiple cut can be produced.
  • the site prefabricated, mountable truss polygon segments can be, with an outer polygon segment with one or more pivotable guide vanes an outer polygon segment and associated inner polygon segment with one or more, pivotable on both segments fixed guide vane (s) can exist.
  • the pivotable guide vanes can be different have arranged pivot axes and corresponding to the Arrangement of the swivel axis in the area of a blade ring segment be attached.
  • Guide vanes with a centrally arranged swivel axis.
  • This swivel or adjustment axis runs vertically to the flow areas of the outer ring segments and inner ring segments, that is, with inclined outer ring segments and inner ring segments inclined accordingly.
  • the Swivel axis can also be in the area of a lower edge of the Guide vanes, which are also compared as gas inlet edge to an upper edge of the blade or a gas outlet edge can be designated. Basically can by training the gas inlet or An additional gas outlet edge of the guide vanes Influencing the flow.
  • the swivel axis on the lower guide vane edge is a rounded one or streamlined training advantageous, these continue in the shape of the guide vanes can.
  • the guide vanes can therefore be flat or also be curved.
  • the adjustment mechanism for adjusting the inclination of the guide vanes advantageous, which is an adjustment outside of the mill housing and during mill operation.
  • the adjustment mechanism can be used for a guide vane, for several arranged on a blade polygon segment Guide vanes, for groups of guide vanes on several Blade polygon segments or for all guide blades be provided and as an individual, in groups or an adjustment of all guide vanes his.
  • a clamp can also be used for locking Latching device on the guide vanes and advantageously be provided on the outer wall of the mill housing. It is particularly useful to lock the guide vanes in to integrate the adjustment device.
  • the adjustment of the guide vanes can be particularly easy simple training manually and either from the inside of the mill or from outside the mill.
  • An automatic Setting is with mechanical, known per se, electrical and hydraulic elements possible.
  • Drives for example gear drives, crank drives, Coupling linkage with spherical bearings, in particular ball joints, be used.
  • Figure 1 shows an example of a first training variant of a polygon blade ring 1 in segment form in one partial perspective view.
  • the polygon blade ring 1 has an outer jacket or outer ring 2, an inner jacket or inner ring 3 and guide vanes 4, which between the outer ring 2 and the Inner ring 3 arranged radially and around a centrally formed Pivot axis 25 are pivotable.
  • the polygonal blade ring 1 consists of a large number of connected, connected polygon segments 10, which each have flat and opposing outer polygon segments 5 and inner polygon segments 6 and a pivotable Have guide vane 4. There can also be two three or more pivotable guide vanes 4 on one Polygon segment 10 may be attached. The direction of inclination of the Guide vanes 4 is only in Fig. 1 and the other figures exemplary and can also be set in the opposite direction.
  • the segmented blade ring 1 is a closed polygon, which due to the large number the polygon segments 10 almost forms a circle (see Fig. 4).
  • the inner polygon segments 6 are in the example 1 approximately parallel to those inclined inwards Outside polygon segments 5 arranged, and the radially in between arranged guide vanes 4 form flow channels 14.
  • the angle of inclination ⁇ of the outer polygon segments 5 can be, for example, about 15 °.
  • the opposite flat surfaces of the inner polygon segments 6 and the outer polygon segments 5 ensure adjustment one or more guide vanes 4 and a very small one Gap between the side edges 24, 34 and Outside and inside polygon segments 5, 6 (see Fig. 3).
  • Pivot axes 25 of the guide vanes 4 are only shown schematically. It can be seen that the pivot axes 25 accordingly the angle of inclination ⁇ is not completely horizontal. From the arrangement of the guide vanes 4 in the area of Blade segments 10, which are also called polygon segments can be designated, it follows that the pivot axis 25 is formed approximately in the center of the guide vanes 4 and the guide vanes 4 with the pivot axis 25 almost in the middle in the inner polygon segments 6 and outer polygon segments 5 are guided and in a swivel range of about Swiveled 30 ° to 150 ° and fixed can.
  • the outer polygon segments 5 can with a cover and Be provided attachment, which segments complementary can be formed and then has individual elements 12 or integrated into the outer polygon segments 5 can be.
  • Figures 2 and 3 show a second variant a segmented polygon blade ring 1 with pivotable Guide vanes 4.
  • the vane ring polygon segments 10 each have an outer polygon segment 5 and a pivotable guide vane 4.
  • a polygonal Inner ring is not provided for in this training variant.
  • the function of the inner ring 3 takes over an outer wall surface 7 of the grinding bowl 8, which is cylindrical is (Fig. 3).
  • the guide vanes 4 are flat and with a Swivel axis 25 on a lower guide vane edge 26 Mistake.
  • the guide vanes 4 are about the pivot axis 25 swiveling in a swivel range and with one Swivel angle ⁇ can be fixed from approximately 30 ° to 150 °.
  • the arrangement and dimensioning of a guide vane 4 on an outer polygon segment 5 and its dimensions are adapted to the possible swivel angle ⁇ , so that an unimpeded adjustment and a small distance between a guide vane 4 and the outer polygon segment 5 and the outer wall surface 7 of the grinding bowl 8 are guaranteed.
  • Figure 2 shows that several vanes 4 on one Outside polygon segment 5 can be arranged. Moreover can the guide vanes 4 with pivot axes 25 on one upper vane edge 27 almost "hanging" on the Outside polygon segments 5 fixed and positioned in this way be that the required pivoting is possible.
  • the direction of inclination of the guide vanes can also be opposite , i.e. the swivel angle ⁇ is approximately 90 ° to 150 ° be.
  • FIG 3 shows, analogously to Fig. 2, "flying" on the segmented polygonal outer ring 2 attached guide vanes 4.
  • the same features have identical reference numerals.
  • the guide vanes 4 are on a pivot axis 25 lower vane edge 26 pivotable.
  • the pivot axis 25 is led to the outside and can in the area of Mill housing 11 manually or automatically (not shown) be operated.
  • a clamping device 29 is on the outer wall of the mill housing 11 arranged and prevented a "flutter" and an unwanted adjustment of the Guide vanes 4.
  • the clamping device 29 is used for locking and is one of the possible locking devices, which expediently in the adjustment devices should be integrated (not shown).
  • the asymmetrical formation of the guide vane 4 in the in Fig. 3 results from that with an inclination angle ⁇ arranged attachment of the outer polygon segments 5 on the mill housing 11 via elements 12 and out the cylindrical outer surface 7 of the grinding bowl 8, which in this training variant of the blade ring 1 the Function of the inner ring 3 takes over, as well as the perpendicular to the guide vanes 4 arranged on the outer polygon segments 5.
  • the guide vanes 4 are sealed with their side edges 24 arranged adjacent to the outer surface 7 of the grinding bowl 8.
  • An outward side edge 34 extends complementary to the inclination of the outer ring segments 5 and upper vane edge 27 is arranged approximately horizontally.
  • the lower guide vane edge 26 with the pivot axis 25 runs obliquely inwards and ensures a particularly easy adjustment.
  • FIG. 4 is a highly schematic representation a polygon vane ring 1 in segment shape with pivotable Guide vanes 4 on a large number of outer polygon segments 5 shown.
  • the illustration shows that by the variety of polygon segments 5 a relative slight deviation from the circular design of the Mill housing 11 is made. This deviation is in Fig. 5, which according to a section of the polygon blade ring 1 Fig. 4 shows in an enlarged view, visible.
  • Fig. 6 shows a view
  • Fig. 7 is a plan view according to 5 and 8 are a rear view of an example for a blade polygon segment 10, which is an outer polygon segment 5 and a pivotable guide vane 4 with has a lower pivot axis 25. It becomes clear that the guide vanes 4 approximately diagonally on an outer polygon segment 5 arranged and for an optimal deflection of the Fluid flow are extended.
  • a guide vane 4 which with its lower pivot axis 25 in a lower, right-hand side Area of the outer polygon segment 5 is attached, in the range of a swivel angle ⁇ of approximately 30 to 90 ° be pivoted.
  • a swivel angle ⁇ of approximately 30 to 90 ° be pivoted.
  • the pivot axis 25 in The lower, left-hand area would be the guide vane 4 turned on and the fluid flow would be from a Fluid channel 17 (FIG. 3) in the opposite direction, i.e. clockwise, redirect.
  • Figure 8 illustrates that the guide vanes 4 advantageously also in the middle the outer polygon segments 5 and / or with a central one Swivel axis (not shown) and in both directions can be arranged pivotably.
  • FIGS. 9 and 10 show adjustment mechanisms for pivotable ones Guide vanes 4, which are actuated from the outside can.
  • the adjustment device shown schematically in FIG. 9 31 is manually operable and has a Adjustment element 32, which through a guide opening of the mill housing 11 is guided and for non-positive Engagement in the pivot axis 25 of the guide vanes 4 is formed is.
  • a locking device 32 ensures a secure fixation of the inclined guide vanes 4.
  • Figure 10 shows a transmission device 30 for mechanical Swiveling the guide vanes 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Disintegrating Or Milling (AREA)
  • Drying Of Solid Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP99117648A 1998-09-25 1999-09-07 Schaufelkranz für Luftstrom-Wälzmühlen Expired - Lifetime EP0988894B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19844113A DE19844113A1 (de) 1998-09-25 1998-09-25 Schaufelkranz für Luftstrom-Wälzmühlen
DE19844113 1998-09-25

Publications (3)

Publication Number Publication Date
EP0988894A2 EP0988894A2 (de) 2000-03-29
EP0988894A3 EP0988894A3 (de) 2000-05-31
EP0988894B1 true EP0988894B1 (de) 2001-06-20

Family

ID=7882290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99117648A Expired - Lifetime EP0988894B1 (de) 1998-09-25 1999-09-07 Schaufelkranz für Luftstrom-Wälzmühlen

Country Status (11)

Country Link
US (1) US6092748A (cs)
EP (1) EP0988894B1 (cs)
JP (1) JP4109400B2 (cs)
CN (1) CN1191886C (cs)
AT (1) ATE202299T1 (cs)
CA (1) CA2283365C (cs)
CZ (1) CZ291325B6 (cs)
DE (2) DE19844113A1 (cs)
DK (1) DK0988894T3 (cs)
ES (1) ES2159980T3 (cs)
ZA (1) ZA996065B (cs)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6290071B1 (en) * 1999-12-21 2001-09-18 General Steel And Supply Company Air separator system
US7549382B2 (en) * 2000-04-24 2009-06-23 Edward Kenneth Levy On-line coal flow control mechanism for vertical spindle mills
DE10149817A1 (de) * 2001-10-09 2003-04-10 Bbp Energy Gmbh Walzenschüsselmühle
JP4272456B2 (ja) * 2003-03-25 2009-06-03 バブコック日立株式会社 分級機及びそれを備えた竪型粉砕機、石炭焚ボイラ装置
DE102004019109B4 (de) * 2004-04-20 2006-02-23 Alstom Power Boiler Gmbh Sichterklappenbetätigung
DE102006044833B4 (de) * 2006-09-20 2010-01-21 Babcock Borsig Service Gmbh Zentrifugalsichter und Verfahren zum Sichten
CN102397806B (zh) * 2011-10-13 2015-08-26 郝志刚 立式磨机用物料分散装置
KR101466887B1 (ko) * 2013-06-07 2014-12-04 한양대학교 산학협력단 인쇄회로기판의 금속 단체분리장치
US10376894B2 (en) 2014-02-14 2019-08-13 Glennon C. Sontag Grinder
JP6503307B2 (ja) * 2016-02-09 2019-04-17 三菱日立パワーシステムズ株式会社 粉砕装置、粉砕装置のスロート及び微粉炭焚きボイラ
CN106269195A (zh) * 2016-09-28 2017-01-04 张家口煜达电力科技有限公司 中速磨煤机分段式旋转风环
CN117244675A (zh) * 2023-11-03 2023-12-19 上海卡山科技股份有限公司 一种具有一次风流量调节装置的静风环及磨煤机
CN119303715A (zh) * 2024-12-17 2025-01-14 安徽晋煤中能化工股份有限公司 一种安全性高的粉煤气化磨煤工段煤粉干燥装置

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US4084754A (en) * 1976-07-27 1978-04-18 Loesche Hartzerkleinerungs-Und Zementmaschinen Gmbh & Co. Kg Combined vane-rotor separator
DE3418196A1 (de) * 1984-05-16 1985-11-21 Krupp Polysius Ag, 4720 Beckum Ringmuehle mit verstellbarem duesenring
JPH01199658A (ja) * 1988-02-03 1989-08-11 Babcock Hitachi Kk スロート面積調整構造
JPH01254267A (ja) * 1988-04-05 1989-10-11 Babcock Hitachi Kk 堅型粉砕機
US5090631A (en) * 1990-10-15 1992-02-25 Wark Rickey E Air flow rate control device for pulverizer vane wheel
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
US5667149A (en) * 1995-07-03 1997-09-16 Foster Wheeler Energy Corporation Solids pulverizer mill and process utilizing interactive air port nozzles
US5819947A (en) * 1996-01-29 1998-10-13 Sure Alloy Steel Corporation Classifier cage for rotating mill pulverizers

Also Published As

Publication number Publication date
DE19844113A1 (de) 2000-03-30
US6092748A (en) 2000-07-25
CA2283365A1 (en) 2000-03-25
JP2000093822A (ja) 2000-04-04
ES2159980T3 (es) 2001-10-16
CN1249210A (zh) 2000-04-05
CA2283365C (en) 2006-03-21
CN1191886C (zh) 2005-03-09
CZ291325B6 (cs) 2003-02-12
JP4109400B2 (ja) 2008-07-02
EP0988894A3 (de) 2000-05-31
ZA996065B (en) 2000-01-12
DE59900128D1 (de) 2001-07-26
CZ342599A3 (cs) 2000-04-12
ATE202299T1 (de) 2001-07-15
DK0988894T3 (da) 2001-10-01
EP0988894A2 (de) 2000-03-29

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