chip piles part m harinen
DESCRIPTION
P&PTRANSCRIPT
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MDP Chip piles Marko Harinen, Stora Enso PCCMontes del Plata Supervisory Training 2011
Montes del Plata Supervisory Training 2011
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Uruguay chip pile system80 000m380 000m3Chips to digesterFinesStones + metal
Montes del Plata Supervisory Training 2011
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Meaning of chip piles:
Intermediate storage to enshure constant chip feed to digester in different wood feeding problemsWhat kind of buffer MDP chippiles offer?Reduction of variance in chip qualityWhat kind of variations can be reduced with MDP pile system?
Circular pile Pros and cons+ Relatively low storing times in uruguay compared to nordic mills+ uniform circulation of the pile = no bad sectorsless pile based raw material variationLess work to clean pile area- Limited possibility to reduce raw material variation from wood feeding
Montes del Plata Supervisory Training 2011
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Basic calculations in chip pile arearotation time
Montes del Plata Supervisory Training 2011
Sheet1
Base figuresunitsfactorscalculation formula
Pulp mill pulp production4080Adt/dADprod
Pulp mill pulp production3672Bdt/dAd to Bd 0.9BD_prod=ADprod*0.9
Wood needed6928tcooking yield: 0.53wood_in_tons=Bdprod/cooking yield
wood needed12597m3swood density:550kg/m3wood_in_m3s=wood_in_tons/wood_density
Chips needed in37791m3lchips packing factor: 3 m3/m3wood_in m3l=wood_in_m3s * packing factor
Chippile size80000m3l
chippile diameter118meducated quess
chippile height29mchip pile angle 45 degreducated quess
filling degree70%
chips in one pile56000m3l
rotation time of chips in pile3.0dwith 2 piles
angle speed of the reclaimer4.6 / h
chips in 1 degree sector222m3l
spread of chips from stacker57.3
spread of chips from stacker12.5h= mixing affect
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Mixing properties of a circular chip pilePile formationPile is formed with chip layersStacker rotation directionTime:00:00Time:01:00Time:02:00Layer 1Layer 2Layer3
Montes del Plata Supervisory Training 2011
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Mixing properties of a circular chip pilePile unloadingReclaimer is pealing / unloading several layers at same time = Is mixing the chipsTime:00:00Time:01:00Time:02:00Layer 1Layer 2Layer3Reclaimer rotation direction
Montes del Plata Supervisory Training 2011
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Raw material variation exampleMDP chip pile is mixing with 12h average at speed 3700 Adt/d- Pile is unable to reduce Longer then 12 hours raw material variations
Montes del Plata Supervisory Training 2011
Chart1
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450625.3846153846
450610.7692307692
450596.1538461538
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450552.3076923077
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640479.2307692308
640493.8461538462
640508.4615384615
640523.0769230769
640537.6923076923
640552.3076923077
640566.9230769231
640581.5384615385
640596.1538461538
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Density to chip piles
density in to cooking
time in hours
basic density of a chips
Chip pile affect to basic density to mill example(12 hour moving average) (Time shift between stacker and reclaimer removed)
Calculation
Base figuresunitsfactorscalculation formula
Pulp mill pulp production3700Adt/dADprod
Pulp mill pulp production3330Bdt/dAd to Bd 0.9BD_prod=ADprod*0.9
Wood needed6283tcooking yield: 0.53wood_in_tons=Bdprod/cooking yield
wood needed11424m3swood density:550kg/m3wood_in_m3s=wood_in_tons/wood_density
Chips needed in34271m3lchips packing factor: 3 m3/m3wood_in m3l=wood_in_tons / packing factor
Chippile size80000m3l
chippile diameter118meducated quess
chippile height29mchip pile angle 45 degreducated quess
filling degree70%
chips in one pile56000m3l
rotation time of chips in pile3.3dwith 2 piles
angle speed of the unloader4.6 / h
chips in 1 degree sector222m3l
spread of chips57.3
spread of chips in time12.5h= mixing affect
density example
into chip pileinto digester
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0450625.3846153846
1450610.7692307692
2450596.1538461538
3450581.5384615385
4450566.9230769231
5450552.3076923077
6450537.692307692386.1538461538
7450523.076923076943.75
8450508.4615384615814.2857142857
9450493.8461538462460
10450479.2307692308
11450464.6153846154
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0640464.6153846154
1640479.2307692308
2640493.8461538462
3640508.4615384615
4640523.0769230769
5640537.6923076923
6640552.3076923077
7640566.9230769231
8640581.5384615385
9640596.1538461538
10640610.7692307692
11640625.3846153846
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density example
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Density to chip piles
density in to cooking
time in hours
basic density of a chips
Chip pile affect to basic density to mill example(12 hour moving average)
Sheet3
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Screening Screening pros and cons based on Varkaus debarking plant?- - Result is sensitive to production changes
Montes del Plata Supervisory Training 2011
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Calculation exercise of chip characteristicsTask1: Estimate samples 1 & 2 basic and loose density kg/m3s and kg/m3l
Use following constants:Volume of chips samples 1 & 2: 1.8 litre1m3s = 3 m3lDrycontent can be held as = 1 (dryied chips)
Calculation:
Montes del Plata Supervisory Training 2011
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Calculation exercise of chip characteristicsTask2: Estimate samples 1 & 2 Dry content-%
Use following constants:Volume of chips samples 3 & 4: 2.1 litre1m3s = 3 m3lBasic density of chips = 400kg/m3
Calculation:
Montes del Plata Supervisory Training 2011