J?nschwalde retrofit, upgrade now complete

The flue gas desulfurization (FGD) plant installed at the 3,000 MW J?nschwalde lignite-fired power plant is complete. Siemens Power Generation Group prepared the system`s engineering concept and coordinated retrofit implementation. The contract, from VEAG Vereinigte Energiewerke AG, covered project planning for the power plant, located near Cottbus in Brandenburg, Germany.

VEAG opted for a two-stage, wet scrubbing FGD process developed by Noell/KRC that washes SO2 out of the flue gas with a milk of lime and converts it to gypsum. The process reduces the plant`s flue gas SO2 content from 5,000 mg/m3 to less than the 400 mg/m3 prescribed by the German Ordinance on Large-Scale Combustion Facilities. The annual release of SO2 will be cut by around 750,000 metric tons.

To improve operating economy and efficiency, the upgrade included replacement of all the wear parts in the power plant and its systems–everything from piping to the turbine generator. Individual system refurbishment was scheduled during plant outages, including the integration of the FGD plant and a new instrumentation and control system. The upgrade resulted in increased availability and a service life extension. The increase in auxiliary power demand to meet the needs of the FGD plant was fully compensated by the efficiency-enhancement measures.