There is a significant amount of water in the oil stream from the first stage of the atmospheric pressure tower
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Our plant processes crude oil into low-quality heavy oil, and the electrodialysis desalination process does not work well, which results in frequent salt deposition in Line 1. Strangely enough, when salt is present in the crude oil, its water content is also relatively high; sometimes it even exceeds 0.2%, posing a serious risk to the safe operation of downstream facilities. I have always been puzzled by the fact that after salt formation, the water content of the product also increases – the temperature at which the liquid is drawn off is above 170°C. I would be very grateful if the experts in the group could help analyze this issue! ! !
Reasons for water leakage: ① Has the pump been turned on? Is there any internal leakage? ② Has the water cooler been checked for leaks? ③Is the bottom vapor stripping set a bit high? The reason for salt formation is the precipitation of salt from dissolved water; often, the temperature changes significantly when extracting it, so it is important to maintain stability. Even when the temperature drawn out is very low, it is easy for the cold return flow to flow back to the normal section in the form of a return flow.
Check whether the reflux at the top of the tower contains water; if it does, saturated liquid reflux can be used.