Newbie seeking advice! Distillation column bottom liquid level
Thread Content
May I ask, why is it necessary to reduce the amount of oil being reprocessed and lower the temperature of the slurry returning to the tower when the liquid level at the bottom of the distillation tower is low?
1. Reduce the amount of oil recycled for reprocessing; what should be done is to decrease the amount of oil sent back to the reactor, and instead send more oil back to the tower to maintain the liquid level； 2. Reduce the temperature of the oil slurry returning to the tower, with the aim of condensing more of the reaction gases and liquids at the bottom of the tower.
This adjustment is wrong, right? With the liquid level at the bottom of the tower low, shouldn’t it be adjusted mainly through the reaction depth? Or keep the reaction depth unchanged and adjust the processing volume, the amount of slurry reprocessed, the amount of reprocessed oil, and the amount of diesel distillate
The adjustment of slurry reprocessing should be based on the amount of coke formed during the reaction, as well as considerations related to the thermal balance between the two reactors. When the liquid level in the distillation tower is low, it is necessary to adjust the flow rates of the material entering and leaving the tower as well as the temperature of that material, in order to condense more of the heavier components in the oil and gas, thereby maintaining a stable liquid level in the distillation tower
The adjustment methods for each set of equipment may vary slightly; the methods mentioned above are all valid. Adjustments should be made according to the actual conditions. In some cases, it is possible to adjust the amount of material used in processing, while in other cases, attention is paid to the reaction temperature. It is also possible to adjust the ratio of raw materials used. If the liquid level drops too low, it may even be necessary to add more raw material oil. All adjustments need to take the actual situation into account. I think you need to learn why the liquid level at the bottom of the tower should not be too high or too low, and what effects this can have
There are many ways to adjust the device, depending on the actual situation: 1) Adjust the amount of material processed, such as increasing it; 2) Adjust the raw material ratio by reducing the amount of wax oil used, thereby changing the composition of the raw materials; 3) Lower the temperature at the top of the tower, for example by reducing the steam supply to the reboiler, increasing the reflux volume, and lowering the temperature of the oil slurry returning to the tower
Control the components entering the tower; keep the bottom liquid level low to reduce the entry of relatively lighter components into the tower. Reduce the extraction of the liquid phase at the bottom of the tower.