A OPEN PIT MINING AÇIK OCAK MADENCİLİĞİ

A. Wood
91 Tonne payload truck
3600 Seconds in one hour
90% Operator Efficiency
Loading cycles
Use equation 1.
Time to load truck
Use equation 2.
Trucks Loaded Per Hour
Use equation 3.
Hourly Production
Use equation 4.
Productivity Example 3
21m³ Hydraulic Excavator
38 Tonne wheel loader payload
91 Tonne payload truck
3600 Seconds in one hour
90% Operator Efficiency
Loading cycles
Use equation 1.
Time to load truck
Use equation 2
Trucks Loaded Per Hour
Use equation 3.
Hourly
Production
Use equation 4.
In this illustration, a 19m³ payload,
electric drive wheel loader, is equally as
productive as a 15m³ hydraulic excavator
with similar production availability. (Binns,
2012)
The capital purchase costs and life
expectancy are similar. The advantage of
electric drive wheel loaders is seen in the
operational costs, which are presented in the
next section. (Binns, 2012)
A 21m³ hydraulic shovel compared to the
19m³ electric drive wheel loader will be
more productive if matched for three pass
loading, but will have a higher capital cost
and higher operational cost per tonne loaded.
3 OPERATIONAL COSTS
Fuel consumption is a major cost for all
diesel powered loading tools, compared to
electric powered equipment such as rope
shovels, and to a lesser extent electric
powered hydraulic shovels.
Fuel consumption is minimized on electric
drive wheel loaders through efficient use of
regenerated energy. Mechanical systems
waste this potential energy saving through
heat in friction disks for braking.
Brake Specific Fuel Consumption (BSFC)
is a measure of fuel efficiency within a shaft
reciprocating engine. It is the rate of fuel
consumption divided by the power produced.
It may also be thought of as power-specific
fuel consumption, for this reason. BSFC
allows the fuel efficiency of different
reciprocating engines to be directly
compared.
Equation 5 Brake Specific Fuel Consumption
P = Power produced in kW
C f = Fuel Consumption
(L/hour @ RPM for stated power)
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