The causes resulting in low efficiency of desulfuration and dust-collection in circulating fluidized bed(CFB) boilers have been analysed

a new method consisting of two-stage desulfuration and two-stage dustcollection with injection of limestone and water being put forward.On the basis of original injection of limestone and dust-collection

a simple and easy water-spraying and atomizing activator has been additionally installed

a vast amount of unreacted CaO in the furnace being activated into Ca(OH)2

continuously carrying out desulfuration

making the total efficiency of desulfuration to reach above 90%.At the same time

the said method has function of dust-collection in advance

hence

the target of highly efficient desulfuration and dust-collection can be achieved at capital investment and operation cost as a dry process of desulfuration.