stockyard layout (re)design
DESCRIPTION
Stockyard layout (re)design. Delft University of Technology. Faculty 3ME, Transport Engineering & Logistics. G. Lodewijks, T.A. van Vianen and J.A. Ottjes. Export Terminal Saldanha Bay SA. 2. Bulk terminal simulation. Content. Stockyard functions Stockyard machines - PowerPoint PPT PresentationTRANSCRIPT
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1Stockyard layout (re)design
13-05-2013
Challenge the future
DelftUniversity ofTechnology
Stockyard layout (re)design
Delft University of Technology
G. Lodewijks, T.A. van Vianen and J.A. OttjesFaculty 3ME, Transport Engineering & Logistics
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2Stockyard layout (re)design
Export Terminal Saldanha Bay SA
2
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3Stockyard layout (re)design
Bulk terminal simulation
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4Stockyard layout (re)design
Content1. Stockyard functions2. Stockyard machines3. The machine selection for capacity & blending or
homogenizing 4. The machine selection for the storage of bulk materials5. CASE: stockyard layout design for an import terminal6. Summary
Delwaidedok, Antwerp (Courtesy HeliHolland/Kees Vlot)
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5Stockyard layout (re)design
1. Stockyard functions
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6Stockyard layout (re)design
Stockyard functionsStorage
(A)
Blending
(B)t
x(t)σx(t)
t
y(t)σy(t)
Homogenizing
(C)
y(t)σy(t)
x(t)σx(t)
t t
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7Stockyard layout (re)design
2. Stockyard machines
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8Stockyard layout (re)design
Stockyard machines - Overview (1)
Handling coal using wheel loaders and mobile feed bunker (Courtesy N.M. Heilig BV)
Stacking of coal using a stacker (Courtesy ThyssenKrupp) Circular storage (Courtesy HeliHolland/ Kees Vlot)
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9Stockyard layout (re)design
Stockyard machines - Overview (2)
Bucket wheel reclaimer (Courtesy FAM)
Bucket wheel stacker/reclaimer, left: stacking, right: reclaiming (Courtesy ThyssenKrupp)
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10Stockyard layout (re)design
Stockyard machines - Overview (3)
Double sided bridge scraper reclaimer (Courtesy ThyssenKrupp)
Reclaiming with a side scraper and stacking with an overhead belt conveyor (Courtesy Taim Weser)
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11Stockyard layout (re)design
3. The machine selection for capacity & blending or homogenizing
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12Stockyard layout (re)design
Stockyard machines - Effective capacity ratio (1)
• During terminal (re)design, the effective capacity ratio is essential to prevent selecting a machine with insufficient capacity
• Effective capacity ratio for a bucket wheel reclaimer relates to the used reclaiming method
Long-travel reclaiming method
Slewing bench reclaiming method
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13Stockyard layout (re)design
Δx
Δx
As(θ)
ωs
h
(A)
(B)
ωr
θ
As(θ)
MM’
pΔr
hs
θmax
Slewing reclaiming method A) top view and B) lateral view
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14Stockyard layout (re)design
cos( )cos( )
ssr s b bw mC h x l r
Nominal reclaiming capacity:
Para-meter
Description Value Unit Para-meter
Description Value Unit
hs Slice height 4.5 [m] rbw Radius of bucket wheel 4.5 [m]
Δx Max. chip thickness 1 [m] ωss Minimum slewing speed 0.145 [rad/min]
ρm Bulk density coal 0.8 [t/m3] ωsm Maximum slewing speed 0.58 [rad/min]
lb Boom length 60 [m] as Maximum slewing acceleration/ deceleration
0.5 [rad/min2]
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15Stockyard layout (re)design
• Reclaiming capacity for the slewing bench reclaiming method relates to (i) slice cross-sectional area, (ii) the slewing speed and (iii) bulk density of the reclaimed material.
• The reclaim capacity can be kept stable with an increase of the slewing speed
0
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0.5
0.0
0.4
0.8
1.2
1.6
2.0
0 10 20 30 40 50 60 70 80 90
ωs
[rad
/min
]
C r[k
t/h]
θ [°]
Crωs
0
0.1
0.2
0.3
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0.5
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2.0
0 10 20 30 40 50 60 70 80 90
ωs
[rad
/min
]
C r[k
t/h]
θ [°]
Crωs
Without slewing speed adjustment With slewing speed adjustment
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16Stockyard layout (re)design
Stockyard machines - Effective capacity ratio (2)
• The effective capacity ratio was calculated for bucket wheel reclaimers for the long-travel and the slewing-bench reclaiming method.
Para-meter
Description Value Unit Para-meter
Description Value Unit
lt Total pile’s length 325 [m] h Slice height 4.5 [m]
w Pile’s width 50 [m] Δx Maximum chip thickness 1 [m]
h Height of the pile 18 [m] lb Boom length 60 [m]
ρm Bulk density coal 0.8 [t/m3] rbw Radius of bucket wheel 4.5 [m]
α Angle of repose 38 [°] ωss Start slewing speed 0.25 [rad/min]
vt Travelling speed 10 [m/min] ωsm Maximum slewing speed 0.58 [rad/min]
at Travel acceleration and deceleration
0.15 [m/min2] as Maximum slewing acceleration & deceleration
0.5 [rad/min2]
y Distance centerline machine to pile
10 [m]
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17Stockyard layout (re)design
• The effective capacity ratio was for the long-travel reclaiming method 75% and for the slewing bench reclaiming method 45%
0.0
0.5
1.0
1.5
2.0
2.5
500 505 510 515 520 525 530 535 540
C r[k
t/h]
Time [min]
long-travelslewing bench
Reclaiming capacity during a time interval of 40 hours for two reclaiming methods
Note: these ratios are not general but were derived using specific input parameters
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18Stockyard layout (re)design
0
0.4
0.8
1.2
1.6
2
50 100 150 200 250 300 350
C r [k
t/h]
lt [m]
Reclaiming efficiency versus the pile's length for the long-travel reclaiming method
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19Stockyard layout (re)design
Stockyard machines Main Characteristics
Machine type Maximum capacity [t/h]
Effective capacity ratio [-]
Stockpile width [m]
Reclaiming method to the pile
Stacker 10,000 0.5-0.65 30-60 -Radial stacker 8,000 0.5-0.65 Ø120 -Side scraper reclaimer
1,000 0.75 10-25 Alongside
Single boom portal scraper reclaimer
2,200 0.75 15-60 Alongside
Double boom portal scraper reclaimer
4,400 0.75 15-60 Alongside
Bridge scraper reclaimer
1,800 0.95 15-60 At the face
Bridge bucket wheel reclaimer
10,000 0.95 30-60 At the face
Drum reclaimer 4,500 0.95 20-50 At the faceBucket wheel reclaimer
12,000 0.4-0.8 30-60 Alongside
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20Stockyard layout (re)design
Blending or homogenizing machines• Stacking is the starting point of the blending process.
Generally there are four basic stacking methods
Reclaimer machineStacking method
Cone Shell
Chevron Strata Windrow
Single scraper reclaimer andPortal scraper reclaimer
2 2 3-4 4-6
Bridge scraper reclaimer - 10 5-6 8-9
Bridge bucket wheel reclaimer
- 4-8 4-6 4-8
Drum reclaimer - 9-10 4-6 7-8Bucket wheel reclaimer - 4-5 5-6 4-6
out
in
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21Stockyard layout (re)design
4. The machine selection for the storage of bulk materials
• Selection of archetype
• Cost calculation
• Operational performance
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22Stockyard layout (re)design
• Multi-purpose machine (stacker/reclaimer) or two single-purpose machines (stacker and reclaimer)
Stacker/reclaimer Stacker Reclaimer
(I)
(II)
Incoming stream Outgoing stream
Belt conveyor
Stockyard lane
ṁin ṁout
B1
B2
A
ṁin ṁout
(A)
(B)
Two layout archetypes
Selection of archetype
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23Stockyard layout (re)design
• Selection must be based on the archetype’s investment cost and performance
• It was assumed that the machine investment cost relates to its weight
0
200
400
600
800
1,000
1,200
0 2 4 6 8 10 12
w [t
]
Cs + Cr [t/h]
lb=25±3 [m]
lb=30±3 [m]
lb=37±3 [m]
lb=46±1 [m]
lb=63±3 [m]
Stacker/reclaimers weight versus capacities as function of boom length
0
1
2
3
4
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9
10
0 1 2 3 4 5 6 7 8 9 10
κ bc
[k€/
m]
Cbc [kt/h]
Upper limitLower limitQuotations: 1 ≥ Lbc ≤ 1.5 [km]
Price per meter for belt conveyors versus its transport capacity
and the belt conveyor investment cost relates to its capacity
Cost calculation
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24Stockyard layout (re)design
• The performance at dry bulk terminals is generally expressed in the total time that ships and trains spend in the port
• The port time is the sum of the waiting time and service time
• The ships waiting time relates to:• Interarrival time distribution • Carrier tonnage distribution• The ship (un)loader utilization• Mean service rate• Mean arrival rate
Queuing theory formulas or simulation
Operational performance
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25Stockyard layout (re)design
5. Case: stockyard layout design for an import terminal
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26Stockyard layout (re)design
Main requirements:
• Import terminal with an annual throughput of 37 [Mt/y], 21% bypass (no storage and handling by stockyard machines)
• Required stockyard area: 92 [ha]• Seaside: bulk carriers, landside: trains• Interarrival time distribution seaside and landside: NED • Carrier tonnage distribution: based on historical data (avg. 101
[kt])• Train tonnage distribution : uniform distributed between 2 and
4 [kt]• Stockyard machine efficiency: 0.55 [-]• 4 unloaders at seaside and 4 loaders at landside• Average seaside’s port time (Wss): 3 days and average
landside’s port time (Wls): 0.5 day• Blending of coal: 1.7 [Mt/y]• 28 different grades of bulk materials must be stored
separately
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27Stockyard layout (re)design
Step 1:
Determine the number of stockyard lanes (nl) and dimension the stockyard lanes (length Ll and width w).
• Assume a machine’s boom length (lb) of 60 meter and use 10 meter as distance from the machine’s centerline to the stockyard lane (p).
• Assume that the lane’s length (Ll) must be in the range between 1,000 and 1,500 meter
• Number of stockyard lanes must be an even number to realize complete archetypes. Calculate the number of archetypes using the following equation:
• An outcome is nl = 14, Ll = 1,315 [m] and w = 50 [m]
plLnA bll
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28Stockyard layout (re)design
Step 2:
Determine the required machine capacity based on Wss ≤ 3 days and Wls ≤ 0.5 day for both archetypes.
SR1
SR2
SR3
SR4
SR6
SR5
SR7
1,315 [m]
A B
C DE F
G HI J
K LM N
O P
Q R
S TU V
W XY Z
AA BB
Stacker/reclaimer
Yard conveyor
Stockyard lane
Bulk carrier
Train
(un)loader
Layout A with 7x archetype (I)
S1
R1S2
R2S3
R3S4
R4S5
R5S6
R6S7
R7
A B
C DE F
G HI J
K LM N
O PQ R
S TU V
W XY Z
AA BB
Stacker
Yard conveyorStockyard lane
Bulk carrier
Train
(un)loader
Reclaimer
1,315 [m]
Layout B with 7x archetype (II)
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29Stockyard layout (re)design
Step 2: results of the simulation study
0.0
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0.7
0.8
0.9
1.0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5W
ls[d
]Cr [kt/h]
Layout A: 7x archetype (I)
Layout B: 7x archetype (II)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Wss
[d]
Cs [kt/h]
Layout A: 7x archetype (I)
Layout B: 7x archetype (II)
(A) (B)Layout Machine Cs [kt/h] Cr [kt/h]
A Stacker/Reclaimer 3.8 4.5
B Stacker 3.6Reclaimer 2.7
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30Stockyard layout (re)design
Step 3:
Calculate the total investment cost per archetype.
• Calculate the stockyard machine’s weight (w) based on the determined stacking and reclaiming capacities
• Investment cost of the stockyard machine(s): where for this case it was assumed that κsm was 8 [€/kg],
machine fully installed at the stockyard• Investment cost for the belt conveyor(s):
where Lbc is conveyor length (1,400 [m]) and κbc was according Figure slide 22 “upper limit”.
Layout Machine Cs [kt/h] Cr [kt/h] w [kt] ICsm [M€] ICbc [M€] TIC(A) [M€]
A Stacker/Reclaimer 3.8 4.5 925 7.4 6.3 13.7
BStacker 3.6 409 3.3 5
16.1Reclaimer 2.7 506 4 3.8
smsm wIC
bcbcbc LIC
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31Stockyard layout (re)design
Step 4:
Design the blending bed with associated machine types.
• Future: high-quality coal will probably become scarce thus install stacker and reclaimer combination which is able to realize the highest bed blending ratio
• Blending bed dimensions: assume coal-fired power plant’s own storage of 5 days and use two blending beds for simultaneously stacking and reclaiming.
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32Stockyard layout (re)design
Step 5:
Final layout.
SR1
SR2
SR3
SR4
SR6
SR5
SR7
1,315 [m]
A B
C DE F
G HI J
K LM N
O P
Q R
S TU V
W XY Z
AA BB
Stacker/reclaimer
Yard conveyor
Stockyard lane
Bulk carrier
Train
(un)loader
Stacker Double sided bridge scraper reclaimer
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33Stockyard layout (re)design
6. Summary
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34Stockyard layout (re)design
Summary
• Three main stockyard functions: storage, blending and homogenizing
• Main characteristics of stockyard machines were presented• The effective capacity ratio for bucket wheel reclaimers
differs per reclaiming method; a method has been provided. • Different combinations of stacking methods and reclaimers
result in specific bed blending effect ratios.• A selection procedure was introduced to select single-
purpose or multi-purpose machines for the storage of bulk materials
• For a specific case, the stockyard layout was designed
• Future work: Design of the network of belt conveyors
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35Stockyard layout (re)design
Questions?