Abnormal current
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Two-stage desalination tank, with a volume of approximately 175 cubic meters. The water injection level is around 5%. Temperature 127. Secondary level control is used for the water outlet from the third tube. The secondary current is normal. Cutting water is good. When the first-level threshold control is set slightly higher, the current increases significantly. What’s the reason?
My brother is also just starting to learn about atmospheric and vacuum distillation; I hope friends who are knowledgeable can help answer his questions. Thank you.
It might be affected by the emulsion layer; if possible, remove the emulsion layer and take a look!
There is no dedicated outlet for draining the emulsion layer; forced drainage can only be carried out at the water cutting point. With the same properties of the crude oil, why is there no problem at the second stage? Please advise
Because your level 2 rank hasn’t increased! I also think it’s because the emulsion layer is too thick; add more demulsifier or lower the interfacial tension a bit
This post was last edited by lyhgchem on 2009-12-24 at 12:37. The key point is that there is still room for adjustment in the setting for the second level; when it is adjusted to the fourth tube, the change in current is quite small. For the first level, oil and water are discharged at the second tube, and if the setting is increased further, the rate of increase in current is very fast. Could there be a problem with the electrical components?
Furthermore, the temperature of the crude oil entering the primary electrodesalination system is higher than that entering the secondary electrodesalination system; as a result, the emulsion layer in the primary electrodesalination tank is thicker than that in the secondary system. This leads to a slightly higher interface level in the primary electrodesalination system, with the emulsion layer being very close to the electrode plates, which may cause the crude oil to contain water. Moreover, the desalinated water from the primary electrodialysis system contains much higher levels of metal ions and has a much higher conductivity compared to that from the secondary electrodialysis system. So that leads to the phenomenon mentioned by the original poster. Suggestion: For raw materials from the same batch, take a sample at the primary electrodialysis stage when the current is normal ； When the potential is a bit higher and the increase in current stabilizes for a certain period, a sample is taken for analysis of the metal ion content as well as the water content. Comparing the two sample lists should allow for a more objective explanation of the reasons. The above is for reference only
It is likely caused by the emulsion layer; more demulsifier should be added at the first stage compared to the second stage, and an appropriate mixing intensity should be adjusted