PT. BANGUN ARTA HUTAMA Maximal capacity of crusher Project Client Operation
Site location Unit Input data : Moisture Content
= = = = =
Assesment equipment PT. Jhon Lin Baratama (JB) PT. Pandu Nusantara Sakti (PNS) Sungai Danau – Kal-sel, Indonesia CR-01
=
44 - 46
%
Assuming
ρb
=
0,85
t/m³
Assuming
Width of roll gap Width of Crusher roll
L W
Driver (Dia. V-Pulley) Driven (Dia. V-Pulley) Diameter roll crusher
Z1 Z2 D
= = = = = = = = = = = = = =
37 65 20 0,6 75-150 0,15 45 42,75 740 0,15 1,40 0,175 0,50 0,80
Deg
Power motor Drive Effieciency (95%) Angular speed motor
a HGI q db da m da P Pef s
= = = = =
0,15 0,85 0,05 97,44 0,55
Bulk Density Angle of Repose Hardgrove Grindability Index Surcharge Angle Input Size Output Size Gate opening
Assuming Deg m mm m kW kW rpm m m m m m
Assuming Assuming Assuming Actual Actual Assuming Assuming
Assuming
Reference data :
Efficiency factor (0,15 - 0,3) Bulk density
ɛ ρb
Bond's range: upper Bond’s coefficient Friction kinetic base on figure 2.5
dbu Kb µk
t/m3 m
Kick for d > 50 mm Thus Bond for 50 mm > d > 0.05 mm
Calculation : Kick’s coefficient
Kk
= =
1,151 . Kb . (dbu)^(-0,5) 501,57
Grinding Work
Wk
= =
KK ( ln (db) – ln (da) 695,32 kJ/t
by Kick’s Law
Specific energy required
Ek
= =
Wk / 3600 0,19 kWh/t
by Kick’s Law
Capacity (2XP)
Q
= 2.P / Ek = 590,23 TPH In practice, the actual capacity can be as little as 25 % of this calculated capacity. This correction is required due to voids between particles and the increase in bulk density of the particles as it passes through the crushing chamber. When the feed rate is irregular, the capacity would decrease. So, for correction actual capacity
Q
=
442,67
Friction factor between material
µ
= =
tan θ . µk 0,595
Velocity
v
= =
Q / (3600 . L . W . ɛ . v . µ . ρ b) 7,71 m/s
Angular Speer Roll
n
= =
v . 60 / 3,14 . D 184,25 rpm
TPH
Capacity 75%
