800 MWe Single Absorber FGD Plant with Wet Stack for Five Boilers in Poland Stand Alone Wet Stack Application

摘要

Central Europe has plenty of big power plants consisting of many units with various size and age. To desulphurize flue gas from these power plants with an own FGD for each unit is an uneconomical solution. With highly reliable technology and well designed redundancy of equipment make it possible to meet the European Union SO{sub}2 emission limits by connecting several boilers to one common FGD plant of remarkable size. The economics of size will benefit the owner both during construction and in operation and maintenance. Having only one plant to operate and maintain is economical during the several years of operation in comparison with having five of them. Recently wet stacks have become more accepted in Europe. Now there are plans to build FGD's with wet stacks but there are very few already operating FGD plants applying this solution in Europe. A new FGD II at Elektrownia Kozienice (Poland) has been commissioned and started commercial operation in December 2006. The FGD plant has been supplied by Hitachi Ltd. (Japan) and Poltegor (Poland) in consortium. This FGD is connected to five 200 MWe units and able to clean the flue gases of four units at full load simultaneously (800 MWe, 3200000 m{sup}3N/h, dry). This means that it is the largest FGD plant in Europe with single module absorber. The absorber diameter is 19.65 m. The plant can operate also with only one 200 MWe unit in operation. The flue gases are not reheated, but they are led out through a wet stack at a height of 120 m. The wet stack is built on top of the absorber and made of fiber reinforced plastic (FRP). The FGD II project at Elektrownia Kozienice was started in June 2004 and handed over to owner in December 2006, over two months ahead of schedule. For stand alone wet stack application the geometry between the flue gas ducting and wet stack flue for effective droplet collection are important. Selected geometry applied to recent FGD Projects of Hitachi Power Europe will be shown.