beater wheel mill

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    Beater Wheel Mills

    Mechthild AngleysALSTOM Power Boiler GMBH, Stuttgart

    Tel.: +49 711 917 1441

    February 2003February 2003

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    1. Lignite fired boiler 800 MW

    2. Mill and firing arrangement with beater wheel mill

    3. Typical view of a beater wheel mill during maintenance

    4.Components of a beater wheel mill

    5. Beater wheel mill with separating classifier, which divides the pulverised coalstream into a lean and a rich fraction to the burners

    6. Beater wheel mill with precrusher

    7. View of a mill from the mill door side

    8. View cut of a beater wheel mill with percrusher and without classifier

    9. 3 dimensional drawing of a mill door

    10. Box type classifier

    11. Beater wheel

    12.Wear part replacment of a beater wheel

    double bearing

    Comments to the attachedslides

    036 158p

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    Types of Brown Coal/Lignites

    001 328p

    Coal type Country Structure Water

    %

    Ash(raw)%

    LCV

    MJ/kg

    Vol.(waf)%

    Soft brown coalGermany/Australia/India/GreeceTurkey/Bulgaria

    Homogeneousearthy, withoutvisible wood structure

    45 - 70 2 - 20 3 - 12 50 - 65

    LigniteYugoslavia/Poland/Hungary/Austria/Greece/Germany

    inhomogeneous earthyand fibrous, with visiblewood structure

    40 - 50 5 - 30 5 - 12 45 - 55

    Hard lignite

    China/Turkey/

    Yugoslavia/Thailand/USSR/USA

    earthy, hard,

    shelly 10 - 40 5 - 40 6 - 20 40 - 50

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    Power Station Schwarze Pumpe

    011 283p

    0 ,0 m

    + 161 ,5 m

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    with Pulverized Coal Firing

    Mill Arrangementand Beater Wheel Mill

    031 248p

    Mill 1Mill 1Mill 1Mill 1Mill 2Mill 2Mill 2Mill 2

    Mill 3Mill 3Mill 3Mill 3

    Mill 4Mill 4Mill 4Mill 4

    Mill 5Mill 5Mill 5Mill 5 Mill 6Mill 6Mill 6Mill 6

    Mill 7Mill 7Mill 7Mill 7

    Mill 8Mill 8Mill 8Mill 8

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    (General View)

    Size and Capacitiesof ALSTOM Beater Wheel Mills

    035 142p

    Mill type NNNN 26262626 60606060 80808080 120120120120 170170170170 270270270270 340340340340 400400400400

    Rated throughput t/h 11 30 40 60 85 135 170 200

    Motor rating kW 120 280 380 460 650 1035 1400 1600

    The rated throughputs refers to the grinding of Rhenish raw brown coal with

    60 % moisture at 50 % residue on the 0.09 mm sieve, a mixture temperatureof 120 C in the mill outlet and direct p.f. injection by jet burners ofALSTOM design

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    Beater Wheel MillsType S and Type N

    035 138p

    Type S Type N

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    Beater Wheel Mill N 340.43with Separator/Classifier

    035 246p

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    Comminution process inside a beater wheel mill:

    1 - Crack of particles by flash dryingin the hot gas duct

    2 - Comminution by impact between

    beater platesand particle

    Comminution Processof Beater Wheel Mill

    035 247p

    Mill outlet

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    Beater Wheel Mill N 340.43with Beater Wheel Transporter

    035 238p_quer

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    Beater Wheel Mill

    035 103p

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    Type N 340.43 with Separating Classifier

    ALSTOM Beater Wheel Mill

    035 231p

    Sepa rator/ Classifier dam per1

    Distributor in coal inlet chute2

    Extend ed course pa rticle re turn duct3

    Tem pera ture m ea suring point before mill4

    2

    3

    4

    0 .00 m

    + 8 .43 m

    + 15 .90 m

    1

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    Beater Wheel Millwith Precrushers

    035 243p

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    Beater Wheel Millwith Prebeater

    035 230p

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    Beater Wheel Millwith Pre-Beater Stage

    035 001p

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    Beater Wheel Mill

    Mill Door with Prebeater

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    Beater Wheel MillClassifier

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    Beater Wheel MillBeater Wheel

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    Beater Wheel MillDouble Bearing