References
UNTHA's system solution for single-stage waste wood processing at UP Energiewerke GmbH in Dingolfing makes a valuable contribution to the sustainable use of waste materials and to closing regional material cycles. Waste wood categories A1 and A2 from the BMW Group plant in Dingolfing are processed with the XR2000RC single-shaft shredder, freed of metals, and then thermally utilized. The process heat obtained from this is fed back into the BMW plant.
The client
UP Energiewerke GmbH is a joint venture between Bayernwerk Natur GmbH and Stadtwerke Dingolfing − both partners hold a 50 percent stake. UP Energiewerke is entrusted with various renewable energy generation projects. One of these projects is a 15 MW waste wood and biomass heating plant that supplies the BMW Group plant in Dingolfing with process heat. The aim is to close regional material cycles and replace fossil fuels.
The problem
Large quantities of waste wood accumulate every day at the BMW Group plant in Dingolfing. For its economic processing and thermal utilization, UP Energiewerke GmbH, whose heating plant is in the immediate vicinity, sought a powerful and reliable solution that included a shredder, conveyor technology, storage facilities, and an incineration plant.
eta Energieberatung GmbH took on the conceptual design and technical consulting and ultimately recommended UNTHA as the general supplier for the shredding solution, including conveyor technology, metal separation, and fire protection system.
REQUIREMENTS
- High energy efficiency
- Defined final fraction in accordance with P63
- Low noise and dust emissions
- Slow-running drive
The solution
UNTHA delivered a turnkey system built around the XR2000 shredder with RC cutting system. This single-shaft shredder provides efficient and reliable processing of waste wood, even when the material contains contaminants such as nails and screws. The robust cutting system and specially designed cutter teeth deliver aggressive material intake, allowing the machine to operate without the need for a hydraulic pusher. Combined with a 70 mm perforated screen, the system produces a consistent finished product while processing approximately 6–7 tons of waste wood per hour in a single-stage operation. The goal is to produce an output fraction meeting P63 specifications, enabling efficient thermal utilization and optimal heat energy recovery. The shredded waste wood is discharged via an enclosed conveyor to a magnetic separator, where ferrous metals are removed to ensure a clean fuel stream. The material is then conveyed through a fire-rated wall opening to the outdoor storage area. There, three independently filled bunkers store the processed material and provide a consistent feedstock for the 3 MW waste wood boiler.
To reduce dust emissions, the XR's hopper has been equipped with a water spray system. In addition, an automatic fire protection system is used. Sensors located on the discharge conveyor and within the hopper area detect sparks and rising temperatures. If detected, the system automatically activates a water spray to suppress potential ignition at an early stage.
Another key component of the system is the control cabinet (technical room), which houses all equipment required to operate and monitor the shredder, conveyor system, and cooling components. Thanks to the complete pre-assembly, the container only needs to be set up and connected on site, greatly simplifying commissioning.
UNTHA took over the planning of this turnkey complete solution for us. All components were perfectly adapted to our requirements and optimally coordinated with each other. The cooperation was very positive and characterized by flexibility and professionalism. We can recommend UNTHA without reservation.
Stefan Hoppe
Head of District Heating and Operations Manager at the Industriestraße heating plant.