There was a failure in the mechanical seal of the bottom pump in the hydrocracking distillation tower; inspection revealed salt deposition, and the cause was analyzed.
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There was a failure in the mechanical seal of the bottom pump in the distillation tower; inspection revealed salt deposition.
Personal understanding: 1. Whether the temperature of the reaction bed can achieve SN removal. 2. Whether there are any abnormalities in the bed pressure drop. 3. Whether the quality of the stripping steam meets the requirements. 4. Whether there is any internal leakage in the pump’s own water cooler
The analysis is quite comprehensive; thank you. During normal production, the refined bed layer removes SN, as well as O, Cl, and other elements from the raw material, while salts are removed through frequent water changes. It is generally not carried over to subsequent processes; if it is, the amount is very limited. Other aspects should be considered instead. Thank you for your reply; I am very grateful.
What kind of water is used for cooling the mechanical seal? Both fresh water and recycled water tend to form salts and scale. Also, it is important to ensure that the amount of cooling water used during operation is appropriate; excessive seal temperature can also lead to salt formation and scaling.
The cooling water system has been changed to desalinated water for cooling
The cooling water is recycled water; thank you for the reply.
Check whether the water injection volume is sufficient, and conduct sampling and analysis at high water levels to determine if the ammonia concentration is too high
The diesel product contains water and has a high sulfur content
Replacing the cooling water with deionized water would work, but the cost is a bit high.
The feed to the distillation tower comes from the stripping tower. If the stripping steam is plant-generated steam, then what amount of trisodium phosphate injection will cause an increase in salts in this steam? The salts present in the stripping steam enter the distillation tower and accumulate in the seal of the high-temperature pump at the bottom of the tower. This is also a possible scenario; my personal advice is for reference only!