In the presence of South African President, Cyril Ramaphosa, Anglo American has launched its nuGen™ hydrogen-battery hybrid 290 t class mining truck at the Mogalakwena open pit platinum mine in Limpopo Province.
It was run with 150 t of payload for the launch, only due to there not being a matching shovel in the trial area, but Anglo said that the prototype is already fully capable of its full 290 t payload. The launch saw it drive up a 7% slope – representative of typical mine haul road grade at Mogalakwena – and then dump the 150 t load, with a main driver and co-driver on board the truck.
Tony O’Neill, Anglo American Group Technical Director, said the nuGen™ truck program started in 2018, but took a while to get traction due to COVID, however, he added that he remains hopeful that by mid-decade, Anglo American will start the rollout across its wider mining business, and that it will likely by then be on the third generation of the design.
“We are already working on the second generation as I speak. We have come a long way, but really we are at the beginning.” He acknowledged Anglo American’s Julian Soles, Head of Technology Development, Mining & Sustainability and Donovan Waller, Group Head of Technology Development for their and their teams’ key role in bringing the project to fruition as well as current Anglo American CEO Duncan Wanblad and just left CEO Mark Cutifani plus the Anglo American Board for their leap of faith and investment commitment to the project.
Specialised filtration system
The hydraulic system was unchanged, but one advantage of electric power, including control of braking, is that the delivered power to the truck systems is much more precise and efficient than diesel power without the engine revving that it requires. While it will take some time for the technology to achieve economic parity with diesel – some of the more obvious savings include vastly less lubricant use without a diesel engine and there being no need for a complex radiator system to prevent overheating, a new radiator design instead managing thermal aspects of the fuel cells.
The truck also has a specialised filtration system to limit dust and sulphur levels reaching the fuel cells. New safety features include special crackable glass allowing hydrogen can escape if necessary.
The nuGen™ truck also allows for the downhill recharge of the batteries to not waste potential regenerative energy that would normally be dissipated as heat on a diesel truck. Only water is emitted from the truck during operation. This one 930E truck unconverted uses 3,000 L/d of diesel – extrapolating this up to the carbon saving from Mogalakwena’s fleet alone, let alone Anglo’s wider mining truck population the potential is massive.
For the nuGen™ project, Anglo American has worked with some of the world’s leading creative engineering and technology companies, such as ENGIE, First Mode, Ballard and NPROXX, to design, build, and test the 1.2 MWh battery pack, as the haul truck system uses multiple fuel cells that deliver up to 800 kW of power, combining to deliver a total of 2 MW of power; plus design and implement a software solution to safely manage power and energy between the fuel cells, batteries, and vehicle drivetrain; and develop the power management and battery systems from the ground up, “enabling us to tailor the system to each mine and improve overall efficiency by designing in energy recovery as the haul trucks travel downhill through regenerative braking.”
It has also seen the building of a hydrogen production, storage, and refuelling complex at Mogalakwena that incorporates the largest electrolyser in Africa and a solar plant to support the operation of the haul truck. To maximise truck efficiency, the refuelling station will be positioned within the working pit area, to minimise travel distance for the nuGen™ trucks, with refuelling taking about nine minutes. While use of the nuGen™ truck does not mean a loss of productive performance, diesel trucks currently will be able to operate for longer before refuelling but these are the kinds of issues being worked on for the next generation of the truck.
The 2 MW hydrogen-battery hybrid truck actually generates more power than its diesel predecessor, and to give it its full title, is part of Anglo American’s nuGen™ Zero Emission Haulage Solution (ZEHS). nuGen™ provides a fully integrated green hydrogen system, consisting of production, fuelling and haulage system, with green hydrogen to be produced at the minesite. nuGen™ is part of FutureSmart Mining™, Anglo American’s innovation-led approach to sustainable mining – which brings together technology and digitalisation to drive sustainability outcomes, “including our commitment to carbon-neutrality across our operations by 2040.” And the trucks are appropriately being launched at a platinum mine – each utilises 4 oz of platinum in their fuel cells – with each truck using eight Ballard FCveloCity®-HD 100 kW modules.
nuGen™ conversions will have to happen as part of a phased approach with nuGen™ and diesel trucks co-existing at these mines for several years before conversions can be completed. And at some point as trucks would have been due for replacement anyway, conversions will have to make way for new FCEV trucks. There is also the complication of Anglo having numerous different truck types across its sites – looking at Komatsu alone it includes 730E/830E/860E/930E/960E/980E, all different size classes and with their own design nuances. Also Anglo doesn’t just run Komatsu trucks – at Quellaveco for example, it is using Cat 794 AC autonomous trucks that run off Cat’s Command for hauling system.