Mobile crushing and screening plants that are operated with electricity instead of diesel fuel are regarded as more environmentally friendly because they do not emit CO₂ on site. They are also ahead in terms of cost-effectiveness in the long term, according to Kleemann.
Although the initial investment costs are higher, they are quickly amortized due to the fuel savings. A sample calculation shows that this is already possible after around six years – if the plant can be supplied with energy via the customer’s own photovoltaic system, even after around four years.
“Our mobile plant train in the sample calculation consists of a jaw crusher MOBICAT MC 120 PRO, cone crusher MOBICONE MCO 110 PRO as a secondary crushing plant and a downstream screen machine MOBISCREEN MSC 953 EVO. The plant train consumes an average of approximately 77 liters of diesel fuel per operating hour. In the electrified version, it has an average fuel consumption of 302 kW per operating hour. The maximum power requirement is 542 kilowatt,” said Tobias Böckle, head of product management at Kleemann. “The energy requirement must first be met by the infrastructure and, ideally, by electricity from renewable energy sources. The power supply from the company’s own photovoltaic system is sustainable and a very fast cost-efficient solution.”
Many companies already have a transformer on their premises that adapts the voltage to requirements and, for example, provides low voltage for plants. Once the required power has been calculated, it is necessary to check whether the available transformer is sufficiently dimensioned. Does it deliver the required power? The amount of power that can be drawn from the transformer is indicated on the type plate.
It is also important to consider where the main distribution is located on the site and where the plant will be used. Good planning here is the prerequisite for efficient operation.
An example: The electrical energy required to supply the plant is not transformed to low voltage directly at the transfer station, but is instead routed over the medium-voltage level across the site to the plant. The cable cross-section can therefore be much thinner, making the cable more manageable and significantly cheaper.
At the mobile plant, a second transformer converts the current into low voltage in order to operate the mobile crushing or screening plant. The aim is to develop a suitable individual concept.
Kleemann (The Wirtgen Group), www.wirtgen-group.com