ANDRITZ successfully starts up biomass boiler plant at Vattenfall AB, Uppsala, Sweden
The heating plant is located on Vattenfall’s existing combined heat and power plant site in Uppsala, Sweden, some 70 km north of Stockholm. This new plant supplies more than 110 MW of district heat to the Uppsala area and is also prepared for electricity production at a later stage. The fuel for the new plant comprises different kinds of wood-based biomass, such as recycled wood, bark, wood chips, and sawdust. The ANDRITZ scope of supply included biomass receiving, handling and storage silos, a biomass-fired boiler with flue gas cleaning, and a flue gas condenser. The boiler is based on the ANDRITZ EcoFluid bubbling fluidized bed design, which combines high efficiency with excellent environmental performance. Flue gas emissions are reduced to very low levels, with the selective catalytic reduction (SCR) method for NOx emissions and a baghouse filter, including sorbent feeding, for sulfur dioxide (SO2), hydrochloric acid (HCl), heavy metals, and dust emissions. The flue gas condenser significantly increases the district heat output and, therefore, improves plant efficiency to beyond 110% when calculated using the fuel lower heating value.