If the temperature at the bottom of the vacuum tower is above 380°C and the liquid level in the tower bottom rises, could this have an impact on the vacuum level at the top of the tower? Why?
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If the temperature at the bottom of the vacuum tower is above 380°C and the liquid level in the tower bottom rises, could this have an impact on the vacuum level at the top of the tower? Why?
It has an impact; a bottom temperature of 380 degrees in the vacuum distillation tower is already quite high, and this may lead to the cracking or coking of the oil products at the bottom of the tower. This is also the reason for the reduced diameter in the design of the bottom of the pressure relief tower. The cracking of oil products has a significant impact on the vacuum level
Lowering the liquid level reduces the risk of excessively high levels; longer residence time of heavy oil along with higher temperatures result in more pyrolysis gases, which in turn lowers the vacuum level
Prolonged residence time leads to cracking; without backwashing, coking will definitely occur, reducing the vacuum level
The liquid level at the bottom of the tower rises, the residence time of oil inside the tower increases, more pyrolyzed oil and gas are produced, and the vacuum level decreases.