An approach to problems of scaling and clogging etc. which affecting the operation of wet calcium flue gas desulfuration （FGD） facility for industrial boilers has been carried out

and concrete quantitative computation being made

obtaining the range of pH value having to be controlled. In order to control the pH value of desulfuration liquid

an intelligent online pH value controller can be installed in the said system; in addition

a gravity type dehydration tank can be added in the system

using the dust contained in the tank to filtrate solid matters produced in the said system

ensuring further to prevent the system from scaling and clogging. Practice shows that the developed scheme of antiscaling andclogging to be feasible.