Dispersion Effect of Polyacrylic Acid on Sludge Particles in the Secondary Side of Steam Generator
The main component of sludge particles in the secondary side of steam generator(SG)of PWR nuclear power plant was iron oxide.The dispersion effect of polyacrylic acid(PAA)on Fe3O4 and Fe2O3 iron oxide particles was investigated by static sedimentation tests.The results show that the sedimentation rate of Fe3O4 and Fe2O3 particles slowed down with PAA addition,and it showed better on Fe3O4 particles.The dispersion effect of PAA on iron oxide particles increased with the decrease of particle size,and PAA had obvious dispersion effect on Fe3O4 particles with particle size below 12 μm.The effective mass concentration of PAA to maintain high dispersing effect on iron-based particles was quite wide,ranging from μg/L to mg/L.PAA had obvious dispersing effect on SG real sludge in particle size less then 28 μm,and the addition of PAA improved its suspension efficiency from 34.05％to 56.93％.
polyacrylic acid(PAA)iron oxide particlestatic sedimentation testdispersion effectpressurized water reactor nuclear power plant
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