Full-Scale Evaluation of SO2 Capture Increase for a Semi-Dry FGD Technology

摘要

The paper is focused on examination of a possibility of increase of current semi-dry FGDtechnology SO2 capture ratio for two 130 t/h PC boilers that burn a blend of lignite and hard coal. TheFGD unit has been designed to reach SO2 emission limit 1350 mg/Nm3, the aim of the work is to verifyreaching SO2 emission targets 500 and 200 mg/Nm3. The examination consisted of experiments withthe goal to determine real correlation of SO2 capture ratio with Ca/S and various differences oftemperature in absorber and dew point. Based on these correlations, solvent consumption for the newemission targets was obtained. Second objective was evaluation of solvent consumption for the case offuture substitution of recent coal blend by a new blend of lignite and hard coal. Experiments usingrecent fuel have been carried out in a long-time range in full scale operation, resulting in quantificationof correlation of Ca/S and temperature difference with the SO2 capture ratio