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Operating experience of the worlds largest lime kiln Roberto - - PowerPoint PPT Presentation
Operating experience of the worlds largest lime kiln Roberto - - PowerPoint PPT Presentation
Operating experience of the worlds largest lime kiln Roberto Villarroel Eldorado Brazil Sao Paulo, BRAZIL Honghi Tran University of Toronto Toronto, ON, CANADA The 7th International Colloquium on Eucalyptus Pulp Vitoria, Brazil, May 28,
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Eldorado Mill Project Fev 2010 Start-Up Nov 2012 Inaguration Dez/2012 Learn Curve Ago/2013 1.000.0000 ton/y Out/2013 Pulp Capacity 1.5mtpy
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Wood Handling 1.200 m³s/h Cooking 5.100 tsa/d Bleaching 4.750 adt/d Drying 5.022 adt/d Evaporation 1.600 tH2O/h Recovery Boiler 6.800 tds/d Power Boiler 120 t/h Causticizing 15.700 m³/d Lime Kiln 1.200 t/d Boiler Feedwater Treatment 630 m³/h Effluent Treatment 6.500 m³/h
Eldorado Design
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Lime Kiln
Reburnt Lime inventory 2 silo 3000 tonne 1 silo: 200 tonne Fresh Lime Bin 1silo 1000 tonne Purge by Lime milk to effluent in balance : 7,8Kg/Adt Fuel:
- Fuel Oil / (Natural gas)
- Methanol
- Hidrogên
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Global Survey on Lime Kiln Operation, Energy Consumption and Alternative Fuel Usage-Pulp & Paper Centre - University of Toronto - December 28, 2009
Lime Kiln Volume
200 400 600 800 1000 1200 1000 2000 3000 4000 Production, t CaO/d Kiln Volume, m3
2011 Design 2011 Operating 1993 Operating
Eldorado
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Main Dimensions
Cylinder Size: 5.5 m diam. x 165 m long Number of Supports: 5 Rotation 1.36 rpm Slope: 2.0 % Cyclone (LMD) Size: 5.5 m diam x 15.9m overall height
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Size Comparison
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Size Comparison
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Size Comparison
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9.8” 2,5”
Lime Kiln-burning Zone
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Lime Kiln Advanced Control
Strategy control in stable operation Feed End Temperature Firing Hood Temperature Excess Oxygen/emissions
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Lime Kiln Advanced Control
- Lab measure residual CaCO3 and Operator input every 4-8
hrs
- Kiln temperature profile is managed by ACE
- Production rate can de controlled by ACE automatically .
- ACE tries to minimize the fuel consumption based on target quality.
- Residual Carbonate target is set by the operator
- Emissions Limits are set by the operator
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200 400 600 800 1000 1200 1400 30 60 90 120 150 180 210 240 270 300 330 360 TPD Day (Nov2013-Nov2014)
Production TPD Lime
LK production Average production
Operation Stabibity
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2500 5000 7500 10000 30 60 90 120 150 180 210 240 270 300 330 360 MJ/tonne CaO Days ( Nov 2013- Nov 2014)
Kiln Heat Rate
Heat Rate-Op Avg-in Operation"
Energy Consumption
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65 70 75 80 85 90 2000 4000 6000 8000 Mud Solids % samples ( Nov 2013-Nov 2014)
Solids Content of mud-to-Kiln
DS%-Op Avg
Lime Mud Solids Content
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75 80 85 90 95 100 2000 4000 6000 8000 10000 Availability
samples ( Nov 2013-Nov 2014)
Lime Availability (%)
Quality
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Global Survey on Lime Kiln Operation, Energy Consumption and Alternative Fuel Usage-Pulp & Paper Centre - University of Toronto - December 28, 2009
Operation Issues
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100 200 300 400 500 600 100 200 300 400 mgr/Nm3 Day ( Nov 2013-Nov2014)
NOx Emissions
Emissions (?)
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Thermal efficiency
50 100 150 200 250 300 350 5 10 15 20 25 50 100 150 200 250 300 350 400 O2 Título do Eixo
O2 vs Gas Temp.
O2 Temp C
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Refractory Damage
- After 274 Day after the first Outage 10m in burning zone was replace
(27/09)
- 8 day out of operation
- Displacement of refractory rings- sensitive
- Complex Lime mud strategy (truck)
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Refractory Damage
Refractory(10m) 0.8 MMUS$ Fuel Oil
- 0.7
MMUS$
- Transp. Int.
0.1 MMUS$ Transp ext. 0.8 MMUS$ Purchased Lime 1.1 MMUS$ Total 2.2 MMUS$
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