Online monitoring method for quality of desulfurization slurry of thermal power generating unit

The invention relates to a thermal power generating unit desulfurization slurry quality on-line monitoring method, which introduces a composite coefficient g to eliminate the influence of gas volume and inlet SO2 concentration on CaCO3 slurry flow. After simplification, the desulfurization efficiency, the pH value and the composite coefficient g are regarded as parameter input algorithms for monitoring the slurry quality. Acquiring historical health data of the health state of the desulfurization slurry according to the composite coefficient g, the desulfurization efficiency and the PH value; calculating an initial class center # imgabs0 # of each health state of the historical health data set according to a reliability peak value and a disjoint neighborhood, iteratively updating a class center # imgabs1 # of each health state of the data sample set and a class center # imgabs2 # of a transition health state, and then calculating the reliability of each data sample belonging to each performance state; and fin