Progress Progress is is our our tradition tradition The grinding process The grinding process The grinding process The grinding process The grinding process The grinding process The grinding process The grinding process Control of the grinding process Control of the grinding process Control of the grinding process Control of the grinding process Control of the grinding process Control of the grinding process Control of the grinding process Control of the grinding process Operation Operation Operation Operation Operation Operation Operation Operation GEBR. PFEIFFER AG GEBR. PFEIFFER AG GEBR. PFEIFFER AG GEBR. PFEIFFER AG GEBR. PFEIFFER AG GEBR. PFEIFFER AG GEBR. PFEIFFER AG GEBR. PFEIFFER AG November 2009 November 2009 November 2009 November 2009 November 2009 November 2009 November 2009 November 2009
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Progress Progress isis ourour traditiontradition
The grinding processThe grinding processThe grinding processThe grinding processThe grinding processThe grinding processThe grinding processThe grinding processControl of the grinding processControl of the grinding processControl of the grinding processControl of the grinding processControl of the grinding processControl of the grinding processControl of the grinding processControl of the grinding process
OperationOperationOperationOperationOperationOperationOperationOperation
GEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AG
November 2009November 2009November 2009November 2009November 2009November 2009November 2009November 2009
GEBR. PFEIFFER AG
MPS MPS verticalvertical rollerroller millmillTP/ Ne- 08 / 04
fine product
raw material
hot gas
reject material
GEBR. PFEIFFER AG
ProcessesProcesses in MPS in MPS verticalvertical rollerroller millmillTP/ Ne- 08 / 04
PneumaticPneumaticPneumaticPneumatic conveyingconveyingconveyingconveying
ClassifyingClassifyingClassifyingClassifying
CompressionCompressionCompressionCompression grindinggrindinggrindinggrinding in material in material in material in material bedbedbedbed in in in in betweenbetweenbetweenbetween rollersrollersrollersrollers and and and and tabletabletabletable
DryingDryingDryingDrying, , , , mixingmixingmixingmixing, , , , conveyingconveyingconveyingconveying in in in in fluidizedfluidizedfluidizedfluidized bedbedbedbed aboveaboveaboveabovenozzlenozzlenozzlenozzle ringringringring
MechanicalMechanicalMechanicalMechanical conveyingconveyingconveyingconveying
GEBR. PFEIFFER AG
Grinding: Compression of material bedGrinding: Compression of material bedTP/ Ne- 08 / 04
Max. feed size: 3-5 % dR
Much finer feed may destabilizematerial bed
GEBR. PFEIFFER AG
GrindingGrinding rollerrollerTP/ Ne- 08 / 04
GEBR. PFEIFFER AG
Power absorption P during compression of Power absorption P during compression of
material bedmaterial bed
TP/ Ne- 08 / 04
(1)(1)(1)(1) P = P = P = P = WWWWmmmm x mx mx mx m neededneededneededneeded
(2)(2)(2)(2) P = P = P = P = ββββ x Fx Fx Fx FRRRR x z x Vx z x Vx z x Vx z x V introducedintroducedintroducedintroduced ininininmaterial material material material bedbedbedbed
WmWmWmWm specspecspecspec. power . power . power . power consumptionconsumptionconsumptionconsumption dependingdependingdependingdepending on on on on material, material, material, material, productproductproductproduct finenessfinenessfinenessfineness, (dam ring), (, (dam ring), (, (dam ring), (, (dam ring), (wearwearwearwear) ) ) )
ββββ frictionfrictionfrictionfriction factorfactorfactorfactor dependingdependingdependingdepending on material, on material, on material, on material, productproductproductproductfinenessfinenessfinenessfineness, (, (, (, (airairairair volumevolumevolumevolume))))
GrindingGrindingGrindingGrinding force Fforce Fforce Fforce FR R R R to to to to bebebebe adaptedadaptedadaptedadapted, , , , maximummaximummaximummaximum givengivengivengiven bybybybymechanicalmechanicalmechanicalmechanical designdesigndesigndesign, , , , numbernumbernumbernumber of of of of rollersrollersrollersrollers (z) and (z) and (z) and (z) and tabletabletabletable speedspeedspeedspeed(v) (v) (v) (v) givengivengivengiven bybybyby designdesigndesigndesign
GEBR. PFEIFFER AG
MPS MPS grindinggrinding zonezoneTP/ Ne- 08 / 04
grinding roller
dam ring
air flow through nozzle ring
AimAimAimAim::::AlwaysAlwaysAlwaysAlways stablestablestablestable material material material material bedbedbedbed duringduringduringduringcompressioncompressioncompressioncompression, no , no , no , no suddensuddensuddensudden changeschangeschangeschanges
(water spray)
material on table
GEBR. PFEIFFER AG
DustloadDustload (air flow) depending on spec. energy (air flow) depending on spec. energy
consumption (grindability)consumption (grindability)
TP/ Ne- 07 / 05
Industrial MPS-mills with high efficiency classifier SLS,
not limited by heat balance or kiln process
0
100
200
300
400
500
600
700
800
900
1000
4 5 6 7 8 9 10 11 12
spec. power consumption in kWh/t
du
st
loa
d i
n g
/m³
MPS-mills with SLS-classifier
Mills with competitors' classifier
GEBR. PFEIFFER AG
ClassifierClassifierClassifierClassifierClassifierClassifierClassifierClassifier -------- typetypetypetypetypetypetypetype SLS SLS SLS SLS SLS SLS SLS SLS TP/ Ne- 08 / 04
louver
fine product
drive
grit cone
rotor
feed material
Check of gapbetween rotor and static classifyerpart
Adjustment of finenessby rotor speed: Higherrotor speed giveshigher fineness
GEBR. PFEIFFER AG
Design of Design of annularannular gapgap onon
SLS high SLS high efficiencyefficiency classifierclassifier
detail of annular gap
three-part wear ring
annular gap
gas outlet duct
submerged pipe
separating rotorTP/ Ne- 07 / 05
Check of annulargap between rotorand staticclassifyer part
GEBR. PFEIFFER AG
Determination of the product fineness Determination of the product fineness
specific surface (Blaine) / sieve methodspecific surface (Blaine) / sieve method
TP/ Ne- 07 / 05
Blaine for OPC, slag cements and slag
Residue on sieve from joint grindingof mixed cements containingcomponents with good grindability (e.g. limestone, puzzolana)
GEBR. PFEIFFER AG
MPS in MPS in drydry cementcement productionproduction linelineTP/ Ne- 08 / 04
coal mill
raw mill cement mill
cement raw material
calcium carbonate (CaCO3)
silicon dioxide (SiO2)
aluminium oxide (Al2O3)
iron oxide (Fe2O3)cement clinker
cement
= cement clinker
+ extenders
+ gypsum
coal
GEBR. PFEIFFER AG
Raw material grinding plant with Pfeiffer MPS mill Raw material grinding plant with Pfeiffer MPS mill
dust collection in cyclonedust collection in cyclone
TP/ Ne- 07 / 05
air flow
temperature
gas pressure
dp
gas pressure
GEBR. PFEIFFER AG
Grinding plant with Pfeiffer MPS millGrinding plant with Pfeiffer MPS mill
dust collection in filterdust collection in filter
TP/ Ne- 07 / 05
temperature air flow
dp
gas pressure
GEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AG
TP/ Ne- 08 / 04
Most of vibration problems are caused byfeed problems: lack of feed, sticking, sudden change of feed size
Cement grinding plant Cement grinding plant
GEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AG
TP/ Ne- 08 / 04
Flow sheetFlow sheet
GEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AG
TP/ Ne- 08 / 04
Monitoring equipment for the avoidance of vibrationsMonitoring equipment for the avoidance of vibrations
GEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AGGEBR. PFEIFFER AG
TP/ Ne- 08 / 04
OperationOperation
Operation problems reasons/solutions
Sudden vibrations sudden lack of feed (component), water or air or sudden change of feed size (or moisture)
Sudden vibrations after increase of dp mill too full, so lower feed rate and/or higher hydraulic pressureand/or higher air flow
Higher vibrations after decrease of dp mill too empty, so higher feed rate and/or lower hydraulic pressure
Higher kWh/t, lower throughput may be caused by wear, so measurement, EVA anlaysis byGebr. Pfeiffer, then may bereduction of dam ring or change/ hardfacing of wear parts
Progress Progress isis ourour traditiontradition
GEBR. PFEIFFER AGGEBR. PFEIFFER AG
ThankThank youyou !!
BarbarossastraBarbarossastraBarbarossastraBarbarossastraBarbarossastraBarbarossastraBarbarossastraBarbarossastraßßßßßßßße 50e 50e 50e 50e 50e 50e 50e 50--------5454545454545454
P.O. Box 3080P.O. Box 3080P.O. Box 3080P.O. Box 3080P.O. Box 3080P.O. Box 3080P.O. Box 3080P.O. Box 3080
67618 Kaiserslautern67618 Kaiserslautern67618 Kaiserslautern67618 Kaiserslautern67618 Kaiserslautern67618 Kaiserslautern67618 Kaiserslautern67618 Kaiserslautern
Phone: ..49Phone: ..49Phone: ..49Phone: ..49Phone: ..49Phone: ..49Phone: ..49Phone: ..49--------631631631631631631631631--------41614161416141614161416141614161--------00000000
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eeeeeeee--------mailmailmailmailmailmailmailmail: : : : : : : : [email protected]@[email protected]@[email protected]@[email protected]@gpag.com
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