Diesel products contain water, how to deal with it, please give me some advice.
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The diesel water coming out of the hydrocracking unit is turbid, and the sampling appearance is turbid. The water content in laboratory analysis is within 100ppm. However, after standing for a period of time, clear water will appear. The water in the diesel has been emulsified, or is in the form of water-in-oil. At the bottom of the diesel stripping tower, 1.0MPa superheated steam is used as the stripping medium. The device has been running for more than 9 years. Such obvious signs have not appeared before. I have tried many methods, but they have no effect. I would like to ask friends for advice.
Check the diesel cooler, maybe the cooler is leaking!
You can also check the sealing fluid of the mechanical pump, and check any place that comes into contact with water or steam!
Add some diesel demulsifier to drain out the water and alkali residue during the diesel refining process!
The amount of stripping steam is too large. The overheat temperature is too low. In addition, adding a condenser will work well.
The reason may be that the diesel water cooler is leaking. After all, the device has been running for more than 9 years. Another possibility is that the amount of steam injected at the bottom of the tower is too large, causing the diesel product to contain water. Our diesel products have a dehydration coalescer at the outlet and two dehydration tanks before entering the product tank.
Check the steam consumption of the diesel stripper and add a coalescer to the diesel outlet device
It’s all the stripping steam that’s causing trouble, so what’s the solution?: (1) Stop steam stripping and switch to dry gas stripping to control the flash point. However, I don’t know if there is any case of this, just my personal opinion. (2) Stop the stripping steam and use the bottom reboiler to control the flash point. This investment is large, energy consumption is high, and it is uneconomical.
100PPM seems to be within the normal range because it is steam stripping!
Reply 1# shlydzh 100PPm can still be turbid? It is very translucent below 300PPm.