Abstract: The semidry flue gas desulphurization technology with dualcirculating fluidized bed boiler was introduced. Based on this, combining with the practical application example of flue gas suspension desulphurization technology with dualcirculating fluidized bed in the ‘four furnaces with one tower’ flue gas desulphurization system, several key technologies applied in semidry flue gas desulphurization project were expounded. 

Key words: dual-circulating fluidized bed, semi-dry flue gas desulphurization, ‘four furnaces with one tower’, flow field of flue gas