Optimal location for injecting corrosion inhibitor in atmospheric and vacuum distillation units
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In the atmospheric and vacuum distillation units, the iron ion content in the distillate from the atmospheric unit is not high, at around 1 point several. The pressure reduction device: the ferric ions in the water taken out from the second condenser are at around 8. The pressure reduction unit has three heat exchangers, and the chemical dosing point is currently at the inlet of the first heat exchanger. I would like to ask what methods can be used to address the issue of high iron content in depressurized cut water?
1. Increase the dosage of the corrosion inhibitor. 2. Add inlets before each stage of the heat exchanger to facilitate adjustment
It’s currently 30 ppm; by how much more should it be increased? The secondary stage of the pressure relief device is steam, and the tertiary stage is circulating liquid; therefore, only the secondary atmospheric leg contains water. The pH of the water obtained is not very stable; it can change from 9 to 3.66. Why is that?