SURFACE LOADING
Komatsu says its 2650CX Hybrid is seeing a 40- 50 % reduction in diesel fuel consumption versus large hydraulic shovels but also with greater efficiency and productivity
they fit into operations that run a similar class of hydraulic excavators or rope shovels . We are seeing a 40-50 % reduction in diesel fuel consumption and greenhouse gas emissions compared to hydraulic excavators . Over its life , the hybrid shovel can save 14,000,000 litres of diesel fuel and 37,000 t of carbon emissions .”
SR Hybrid Drive Technology is leveraged on the hybrid shovel to capture regenerative power that is naturally produced . Diesel energy is converted to electrical energy through a switched reluctance generator , which provides power to hoist , crowd , and swing motors . When the 2650CX lowers its bucket or decelerates swing speed , motors become generators , supplying energy to the machine and shutting off fuel supply . Engines do not burn fuel for about 17 % of a typical loading cycle , including dig , swing , dump and return swing , contributing to reduced fuel consumption and longer engine life . To maximise efficiency , the machine utilises electric power over hydraulic to enable regeneration . The
result is 50-60 % less hydraulic fluids needed compared to hydraulic excavators . This translates to additional savings through reduced fluid costs , reduced hydraulic routings and fittings , and a reduced environmental impact .
With a payload capacity of 59 t enabling a four-pass match to 227 t haul trucks , it will accommodate trucks ranging from 135 to 360 t . Tolley adds : “ The P & H 2650CX leverages the hoist and crowd digging forces of P & H electric rope shovels and adds a third force , referred to as breakout force , ie bucket curl . Breakout force is key to flexible digging paths , allowing for horizontal digging along the floor , top-down digging , and selective digging — which is a potential requirement in hard rock , multi-seam coal , or banded iron formations . The 2650CX uses a hydraulic clamshell bucket , eliminating the door-latch mechanism commonly found on rope shovels . The capabilities of the 2650CX provide exceptional reach and height , compared to hydraulic excavators . This allows for higher bucket fill factors , increased material excavated between moves , and operation in bench heights up to 16 m . Additionally , efficiency comes from the fixed-boom architecture of the 2650CX . The fixed boom reduces digging mass from hoist motion , requiring less energy during the dig cycle and maximising bail pull throughout the dig profile .” IM
MARCH 2021 | International Mining