关键词: 石灰石-石膏湿法脱硫, 浆液起泡, 表面张力, 粘度

Abstract: Slurry overflow happens from time to time due to slurry foaming in the absorber of the limestone-gypsum wet desulfurization system, which may endanger the operation of the flue gas desulfurization system (FGD). To find out the foaming causes, the composition and electrical microscope analysis on some FGD slurry and foaming samples is conducted from the aspect of foaming mechanism for different power plants. The results show that the FGD flue gas dust concentration, limestone and process water qualities all will promote slurry foaming, but the severity effects may vary in different plants. To eliminate or alleviate the foaming overflow problem, power plants should first prevent the overflowing liquid from going back to the absorber and then take corresponding measures according to their own situation.

Key words: FGD, slurry foaming, surface tension, viscosity