Factors affecting 95% of catalyzed diesel
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Recently, the value of 95% in my unit has risen abnormally, from 362 degrees to 377 degrees. I made the following adjustments: 1. The reaction temperature was reduced from 511 degrees to 505 degrees; 2. The addition of small quantities of feed was stopped; 3. The temperature at the top of the distillation tower, the temperature at which diesel is extracted, and the temperature at the bottom of the tower were all reduced by about 10 degrees. However, the value of 95% remains high, without showing any decrease even after 16 hours. Could everyone help analyze what might be causing this?
Is it related to the pressure at the top of the fractionation tower?
How many diesel outlets do you have? We encountered a similar issue before; upon inspection, it was found that the lower outlet was open
The main cause of sudden changes is issues with the properties of the raw materials; it’s also possible that the trays become clogged or fall off, or else the gas-phase load increases, causing the heavier components to rise.
The up pull and up return I’m using now
The analysis doesn’t point to this as the cause; we have 2 sets of catalysts, and the raw materials used are the same, so there’s no problem with that set of catalysts
1 Is your unit designed to produce heavy diesel? When too much heavy diesel is extracted, it reduces the internal reflux in the tower, resulting in an increase in the dry point of the diesel. The impact of the 2nd refining counter tower or the second intermediate counter tower is similar. A decrease in the 3-pass refining ratio causes the dry point of diesel to rise. 4 The high catalyst activity causes an increase in the dry point. 5 problems with laboratory analysis. (Large tanks, dry products, high cutting – a few samples for you.) 6 If it is a device used for heat exchange with diesel and raw materials, heat exchanger leakage should be considered.
The heat exchanger for diesel and crude oil has high pressure in the diesel side