The iron content in the water produced from the vacuum distillation unit is high
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The atmospheric and vacuum distillation unit has a processing capacity of 150 t/h. The corrosion inhibitor is injected in shifts on a daily basis, three times a day at 6 kg each time, with a concentration of 5 ppm. The water discharged from the decanter is dark in color, with a pH of 8.6 and an iron ion concentration of 25 mg/L. How can the tower top corrosion problem be solved in this situation? Thank you.
Should we consider changing the injection time, switching from the original mode to continuous injection at a low flow rate?
Continuous injection is required; at the beginning of injection, the amount of the slow-release agent should be increased to ensure a proper molding process
1. Is a pre-coating period required before the system is restarted? 2. What is the approximate concentration of the injection amount during the film-forming stage? Based on a production rate of 150 t/h, how long is the film-forming period approximately? 3. The pH value remains relatively stable after driving, although fluctuations were observed at first as well.
At the moment, it is a continuous injection of small volumes.
With continuous injection, the film-forming period is generally not fixed; it is sufficient to wait until the iron ions have stabilized, which takes about half a week to a week. Your raw materials are bound to fluctuate. The dose increase is quite small
Yes, the raw materials do change frequently. Can the iron ion level be kept below 5 ppm during pre-coating? How is it best to calculate the dosage for normal operation?
The general standard requirement is below 5PPM. During the pre-coating phase, iron ions are kept at levels of 5 ppm or less and remain stable for a certain period of time, before gradually decreasing to the dosage recommended by the manufacturer, which generally ranges from 20 to 50 ppm. Adjust the dosage in a timely manner when the raw materials change
Hello, could you give me your QQ or WeChat number? I’d like to ask you more questions. Thank you.
Just chat with each other; 571319448 is available on WeChat as well as QQ
Or consider using a neutralizing and corrosion-inhibiting agent; blackening indicates relatively severe corrosion, so it’s better to think about neutralizing the hydrogen sulfide present