Accurate filling system framework for process anticorrosion of atmospheric tower top in atmospheric and vacuum distillation unit was built.By using on-site online pH,LIMS assay analysis data and DCS data,the low temperature corrosion control of the atmospheric tower top was realized by intelligent control algorithm and advanced control technology.After usage of the accurate filling anticorrosion system,automatic real-time low temperature corrosion control of the atmospheric tower top was realized.Comparing with situation of the unit before usage of the accurate filling anticorrosion system,mass concentration of iron ions in sulfur-containing wastewater from the reflux tank on top of atmospheric tower was about 0.83 mg/L and decreased by 48.1 percentage points,pH was controlled at 7.16,pass rate of the two indexes were 100％.Consumption of the neutralizing agents was reduced by 30.6 percentage points while im-proving the stability of pH control,and consumption of the corrosion inhibitor was reduced by 10.7 percentage points while decreasing concentration of the iron ions,application effect of the accurate filling anticorrosion system was good.
维普
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