Research on limestone dissolving characteristics in web FGD

In batch reaction system,some kinds of limestone were dissolved in dilute hydrochloric acid.The pH value in the solution increased as limestone was dissolving,and hydrochloric acid solution was added into the solution by an auto-titrator to maintain the pH invariable.With experimental pH value between 4.0～6.1 and temperature between 40 ℃～60 ℃,the limestone dissolution rate profiles were obtained.The results show that increasing the temperature and decreasing the pH value and lower Cl-concentration of the solution can accelerate the dissolution of limestone particles;different particle size distribution(PSD)of the different limestone has significant effect on dissolution rates;fitting equation is in good agreement with experimental results.These studies offer basic data for the design and operation of WFGD industrial set-up.