Increase in top cooling temperature
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The temperature at the top of the vacuum distillation tower has increased; it used to be around 60 degrees, but now it is around 90 degrees. This increase does not have a significant effect on the reflux from the top of the tower. What problems might arise as a result?
If the entire tower rises, it means the heating amount is high; what about the tower pressure? Another situation is insufficient heat extraction in the middle section.
All other areas are normal; increasing heat extraction from the middle section and reducing the heat load on the upper part also had no effect
In the decanting tray separator, is the amount of oil used for decanting very large? If the reflux rate is too high, diesel components will circulate at the top of the tower, causing the temperature at the tower top to remain high. Pull out the diesel in the atmospheric tower, then increase the flow rate at the reduction unit as much as possible; it will be fine after some time
The key issue is that the flow rate of the reflux at the primary stage or at the intermediate stage, or the temperature of the liquid returning to the tower, isn’t properly controlled. Additionally, if the top temperature is too high, the vacuum level should be better than 60 degrees, which in turn results in a higher distillation efficiency.
Has the reflux temperature changed?； Vacuum level status ； It is more likely that the packing is damaged, causing an short circuit for the oil and gas and reducing the backflow effect.
It seems the pressure wasn’t fully relieved at normal pressure, which led to reduced pressure!
Is not enough diesel produced in the atmospheric pressure tower? Has the feed rate to the vacuum furnace increased? Is the atmospheric pressure vaporization rate sufficient?
The processing load, the properties of the raw materials, product quality control, and the effectiveness of vacuuming all have an impact!
I believe that first, it is necessary to ensure (increase) the draw rate of the atmospheric pressure column; secondly, it is important to optimize the operation of the vacuum column by adjusting its heat extraction balance, and to appropriately increase the heat extraction from the intermediate reflux. Slightly increase the furnace temperature and reduce the vacuum level. Third, reduce the return temperature of the oil from the top cutting process.
1. Increase the normal-pressure drawing rate. 2. Slightly reduce the temperature at the outlet of the vacuum furnace. 3. Check the condensation effect in the reflow section to see what the temperature is after cooling. 4. Examine the processing load of your facility to determine whether it is too high. 5. Appropriately increase heat extraction in the middle section. 6. Check the performance of the vacuum water cooling. 7. Inspect the equipment to determine whether there is a problem with a certain intermediate reflux pump, the roof-reduction reflux pump, or the trays. 8. Abnormality control: check for phenomena such as tower surging inside the tower. 9. Is the reduced mass controlled by an upper limit? These are the things that come to mind for now; I hope they’re helpful to you.