The quality of sorbent has significant influence upon the desulphurization ability of the dry flue gas desulphurization(FGD) system.The sorbent has been prepared from quick lime with defferent contents of MgO

and desulphurization test being carried out

so as to determine the influence of MgO mass fraction upon the particle size distribution

the spesific surface area

the pore volume

and the SO2 absorption ability of sorbents.Study shows only small amount of MgO has converted into Mg(OH)2 during the dydration process.The mean particle size increases

and the specific surface area and the pore volume decrease along with the increase of MgO mass fraction

the SO2 absorption ability of sorbent also decreases.In order to ensure the desulphurization ability of sorbents

the mass fraction of MgO in the raw material has to be controlled during the time of sorbent preparation.