The quality of the circulating oil deteriorates
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What are the reasons for the deterioration in the quality of recycled oil? The output at 270℃ dropped suddenly, from 60 to below 50. During this period, the operating parameters for crude benzene remained unchanged; only liquid alkali was added to the final cooling tower. Could it be the addition of alkali that caused this? Please help analyze it
That is, increase the discharge of the regenerated sludge and then add newly washed oil
Didn’t you use liquid alkali before? If it started to deteriorate after starting to use liquid alkali, then it’s a problem with the alkali used.
What is the purpose of adding lye to the final cooling tower?
I often see posts saying that “all other conditions remain unchanged” – can that be guaranteed 100%? If you don’t keep an eye on things on site, anything can happen!
Adding alkali solution to the final cooling tower is intended to decompose fixed ammonium salts, reduce corrosion, and protect the equipment.
Our distillate yield at 270 degrees is around 70, while yours has dropped below 50, which indicates a significant loss of light fractions. I suggest you check whether the density of the crude benzene recently has increased, and also verify whether the temperature at the top of the benzene removal tower is accurate. It is likely that an excessively high temperature at the tower top is causing the loss of light fractions and a decline in the quality of the washed oil. Special attention should also be paid to whether the tower pressure is stable. In production, it’s still necessary to rely on facts rather than just trusting the data shown. I hope this can help you.
Control the regenerator temperature properly; carry out more slag removal. The regeneration effect of the washing oil is poor; it is necessary to ensure that the temperature of the lean oil entering the tower is higher than that of the gas, in order to prevent water from being carried along with the washing oil
It is likely not due to the addition of the alkali washing stage; if the quality of the recycled cleaning oil deteriorates, attention should be paid to three aspects: the temperature and pressure in the regenerator, as well as slag discharge. As for the temperature and pressure parameters at the top and bottom of the benzene removal tower, what abnormalities exist in the indicators related to the lean oil?
Will the addition of ammonium sulfate to the circulating wash oil affect its quality?
What kind of base should be used? Where should it be added? Is it a circulating water system or a condensate spraying system? How should the amount of alkali added be determined? What concentration should the solution be maintained at?