beater wheel mill
TRANSCRIPT
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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