Analysis of the reasons for full liquid level at the bottom of the distillation tower and treatment methods
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I. Cause analysis 1. The reaction depth is too low, resulting in an excessive amount of material to be processed through the reaction. 2. The properties of the raw materials are too severe. 3. The crude oil tank or reprocessed oil tank overflows into the distillation tower. 4. Carbon accumulation occurs during the reaction. 5. The slurry pump is evacuated or malfunctioning. 6. The slurry circulation rate is too high or the temperature returning to the tower is too low. 7. The reprocessing of slurry oil is stopped, or the discharge of slurry oil is blocked. 8. Instrument failure. II. Handling methods 1. Quickly contact the reaction unit to reduce the dosage or increase the reaction depth. 2. Increase the amount of slurry recycled or the amount of slurry discharged externally. 3. Appropriately reduce the slurry circulation rate while ensuring effective catalyst washing and stable operation in the upper part of the fractionator. 4. Slightly increase the temperature in the middle section of the distillation tower. 5. Install the glass plate level gauge and contact the instrumentation team for handling. 6. Check the slurry discharge line; if it cannot be repaired, proceed with an emergency shutdown.
How to adjust when the liquid level at the bottom of the distillation tower is full? Answer: 1. Quickly contact the reaction unit to reduce the feed rate and increase the reaction depth ； 2. Increase the amount of slurry discharged outside and the amount of slurry recycled ； 3. Appropriately reduce the slurry circulation rate ； 4. Slightly increase the temperature in the middle section of the distillation tower ； 5. Check the actual liquid level at the bottom of the fractionation tower ； 6. If the above adjustment methods still fail to lower the liquid level at the bottom of the distillation tower, activate the emergency vent line.
In the case of a coking distillation tower, it’s also possible that the bottom filter is clogged.
What was said on the first floor is already quite comprehensive; it should also be taken into account the possibility that blockages in the downcomer or extraction ports could lead to an increase in the backflow within the tower
This question should definitely be included in the operating procedures as well as in the technical Q&A section; I’m not sure though...? .