Flue gas fans make sure that a slight negative pressure is kept in the furnace to avoid leakage of hazardous flue gases. Flue gases formed during the com- bustion process are passed through three vertical ducts, transferring heat to tubes filled with circulating water. In the three superheaters, the steam reaches a temperature of 400 ◦C and a pressure of 40 bar. The steam is directed to a turbine driving a generator to produce some of the electricity produced in the plant. After passing the turbine the steam is directed to a condenser where district heating water is heated. Large parts of the plant are for cleaning flue gases in several stages. This part of the system falls outside the scope of the report and will therefore not be covered (Sysav, 2010a).