Abstract
Considerable effort is spent on development of technologies for CO2 capture and storage (CCS) to stabilise atmospheric levels of greenhouse gases. Oxy-coal combustion is one promising technical option for the CO2 capture from coal-fired power generation. A 30 MWth pilot oxy-coal fired power plant has been built by Vattenfall at Schwarze Pumpe in Germany to demonstrate the CCS technology. Lignite and bituminous coals will be tested for the oxy-coal combustion and CO2 capture. The flue gas cleaning system comprises electrostatic precipitator (ESP), scrubber and condenser. The ESP-often referred to as a cold ESP when it is placed downstream an air preheater in a conventional air fired plant-operates at a temperature below 200 °C. Conceptual studies are in progress for a full-scale demonstration plant and an attractive option is to have the ESP operating around 350 °C to improve the overall thermal efficiency of the oxy-coal concept. Such an ESP is frequently referred to as a hot ESP and is placed upstream the air preheater.
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