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Peter Wypych delivered the presentation at 2014 Bulk Materials Handling Conference. The 11th annual Bulk Materials Handling Conference is an expert led forum focusing on the engineering behind the latest expansions and upgrades of bulk materials facilities. This conference will evaluate the latest engineering feats that are creating record levels of throughput whilst minimising downtime. For more information about the event, please visit: http://www.informa.com.au/bulkmaterials14
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11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 1
New Design Methods toImprove Efficiency of Solids
Handling and Processing
Peter [email protected]
Aim: Improve Efficiency of BulkMaterials Handling and Processing
1. Reliability: Consistent and predictable start-up, flow, capacity, behaviour
2. O&M Costs
3. Service Life: Wear, process damage
4. Quality Control: Product integrity
5. Sustainable Operation: Spillage, dust, environment, economics, community…
6. Relevant Design Method/s: integrated total solution or systems approach
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 2
1) Bins, hoppers, stockpiles, feeders, bin wall loads…
Arch/rathole dimensions Bin/hopper design graphs Stockpile/bin live capacity Transport moisture limit
Flow patterns: mass-flow, funnel-flow and expanded-flow
Review and Comparison of Design and Modelling Techniques
Application & Product Dependent
Quasi-static applications Traditional FP (sub 4mm): b, , t, w, FF
TypicalFlow
Properties
Dangerous toExtrapolateor Assume!!
Internal Friction
Wall Friction
Internal Strength
Compressibility
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 3
2 4 6 8 10 12 14 16 18 20
20
18
16
14
12
10
8
6
4
2
Flow Functions – Coal 10% wb(effect of time storage)
FF, t = 0
FF, t = 2 days
1 (kPa)
c(kPa)
5 days ??
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 5 10 15
Hopper Outlet Dim
ension (m)
Moisture Content (% wb)
Effect ofMoisture
on ProcessRequirements
DEMC Saturation
Max Strength
Conical
Wedge
RangeFlow
BMEADustiness Tester(AS4156.6-2000)
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 4
Conventional FP Not applicable
Physical size of FP testers Inadequate
Friction, cohesion and adhesion Difficult to scale (dynamic applications)
Fine/sticky/clay ores Special impact tests
Traditional design methods…
2) CTs (hood-spoon, impact plate, rock-box, micro-ledge), “rapid-flow” chutes, trajectories, process equipment, wear… “Dynamic” applications:
Review and Comparison of Design and Modelling Techniques…
Traditional Design Methods1. Experience (including “rule-of-thumb”)2. Trial-and-Error3. Copy-and-Paste4. Analytical or “Continuum” Models5. Physical Scaled-Down Models6. “Traditional” DEM Research…● Time consuming and expensive● Assumptions and fine-tuning● Also Lack of validation
At UOW New Calibration Technology (with dynamic validation) for DEM Design
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 5
Full‐Scale Designs
Representative Dynamic Tests
New Calibration Technology for DEM Design
Industrial Application
Customer Know‐How
EDEMBulkSimCalibrated
Material Model
Calibration for DEM Material Model(New “Swing Arm” Slump Tester: Coal)
Video
Video
Shape, friction and moisture/cohesion
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 6
Calibration for DEM Material Model(New “Swing Arm” Slump Tester: Bauxite)
Video Video
Shape, friction and moisture/cohesion
Other Calibration Tests
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 7
Dynamic Validation of DEM for Design
Conveyor TransferResearch Facility
7 m/s
Video
Dynamic Validation of DEM for Design(Hood-Spoon Conveyor Transfer)
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 8
Dynamic Validation of DEM for Design
Exp VideoDEM Video
Case Study No. 1:Iron Ore Transfer Chute
Parameter Value
Capacity 2,300 tph
Belt Width 1,200 mm
Feed Belt Speed 2.6 m/s
Receiving Belt Speed 2.8 m/s
Bulk Density 2 t/m3
Troughing Angle 45 deg
Inclination Angle ofFeed Belt
2 deg
Chute Liner Ceramic Tile
Moisture Content 9% wb
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 9
Existing Design
Design Problems:
Off-Centre Loading
Reduced Capacity
Non-Symmetrical Wear Patterns
FeedChute
Design Problems
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 10
Solution Option for Re-Design
DeflectorPlate
Design Improvements:
Central Loading
Increased Capacity
Symmetrical Wear Patterns
Feed Chute
Design Improvements
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 11
Parameter Value
Capacity 11,000 tph
Belt Width 1,800 mm
Feed Belt Speed 4.6 m/s
Boom Belt Speed 4.8 m/s
Luff Angle 15 deg
Slew Angle 45 deg
Bulk Density 1.9 t/m3
Troughing Angle 45 deg
Feed Belt Inclination 15 deg
Chute LinerCeramic
Tile
Moisture Content 10% wb
Case Study No. 2:Iron Ore Stacker Transfer Chute
Existing Design
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 12
Design Problems:• Dead Zones• Potential Blockage• High Wear on Boom
Costs to Business:• Downtime• Limited Capacity (incl. surges)• Maintenance – Skirting, Spillage
and Belt Replacement• Overall Poor Reliability
Problems and Costs
ComplexVelocity Profiles
and Flow PatternsContinuum Models:● Particle Velocity● Trajectory● Cohesion ?
ContinuumModels
???
Chute Modelling and Analysis
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 13
Calibrated EDEM Material Modelused to Optimise Design Solution:
Modification B
Modificationof Hood
Modificationof Mid Chute
Modificationof Feed Chute
Modification B:
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 14
Acceleration on Boom
0
50000
100000
150000
200000
250000
300000
0 5 10 15 20
Tangential Cumulative Energy (J)
Simulation Time (s)
Original Design
Modification B
Improved Belt Life (20%)
Cumulative Wear on Boom
Improved Flowand Capacity+
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 15
Case Study No. 3: WSO Chute Blockages
Full-Scale Calibration Tests On-Site+ Special Impact Consolidation Tests
Case Study 4: 900tph Coal + 300tph Filtercake(wear and fines build-up)
Video
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 16
Product Coal Filtercake (dried)
Some Calibration Tests
Product Coal
Filtercake
11th Bulk Materials Handling Conference, 29-30 April 2014, PerthPeter Wypych, Bulk Materials Engineering Australia
© Wypych, 2014 17
Modified ChuteVideo
900tph Coal + 300tph Filtercake
Existing ChuteVideo
Calibrated EDEM Material model:
900tph Coal + 300tph Filtercake
Thanks to NEW Calibrated and Validated DEM Useful Design and
Troubleshooting Tool !!