The liquid level in the catalytic fractionation bottom tank rose sharply
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According to the Q&A on catalytic unit technology, when the liquid level at the bottom of the distillation tower rises sharply, one of the measures is to increase the flow rate at the oil slurry inlet if necessary. How should this be understood? Thank you.
My understanding is that, with the total circulation volume of the slurry remaining unchanged, increasing the circulation volume of the slurry flowing downward means that the circulation volume of the slurry flowing upward decreases. As a result, the temperature of the oil and gas rises, allowing more diesel, gasoline, and other light liquid components to be carried away as product distillates, thereby reducing the liquid level at the bottom of the distillation tower.
After the reaction gas oil enters the distillation tower, it first comes into countercurrent contact with the circulating slurry. The level of the liquid at the bottom of the tower depends on the amount of heavy components that condense in the reaction gas oil. With a constant total volume of circulating slurry, increasing the flow rate of the material going downward in the tower means that the flow rate of the material going upward decreases; as a result, less of the heavy components in the reaction gas oil condenses, and thus the liquid level at the bottom of the distillation tower drops.