Feed to the coking fractionation tower
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I have a gentle question: the oil and gas coming out of the coke tower enter the bottom of the distillation tower, and the feed oil also enters the bottom of the same tower. Which one is on top and which one is on bottom? Is it true that the oil and gas are located below the crude oil, so that the crude oil can wash away the coke particles in the oil and gas while also condensing them? I’m not sure if that’s correct Please tell me, thank you
Generally, the feed to the coking fractionation tower enters through the bottom feed port, including the oil and gas coming from the coke tower as well as the crude oil. Under normal circumstances, the crude oil first enters the bottom of the distillation tower, while the oil and gas coming from the coke tower enter above the crude oil. This design is intended to ensure that the crude oil can wash away coke particles from the gas oil, while also condensing the gas oil, thereby improving the quality of the product. In short, at the bottom of the coking fractionation tower, the crude oil is on top while the oil vapor is below; this allows for the washing of coke powder as well as the condensation of the oil vapor, which helps to improve the quality of the products. .
In fact, this design was considered carefully from the outset: the feed oil is supplied from both the top and the bottom, while the oil-gas line is located between these two supply points. The advantage of this design is that it allows for manual control over the amount of feed oil supplied from each side, thereby controlling the extent to which the feed oil comes into contact with the oil gas. It also serves as a key means of controlling the liquid level and temperature at the bottom of the tower. Similarly, during preheating, the oil separation line is also divided into upper and lower sections within the distillation tower, following the same principle.
You can take a look at the drawings of the fractionation tower; when combined with daily operations, they become very clear.