Why are upper and lower ports used for returning the slurry to the tower?

2009-12-15View Original

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Why are upper and lower ports used for returning the slurry to the tower?

Reply #22009-12-16

The upward flow serves to wash the catalyst and remove excess heat, while the downward flow is used to control the temperature at the bottom of the tower. It’s available in the technical Q&A for catalytic cracking units

Reply #32009-12-16

The upward flow in the tower serves to cool the oil and gas while also washing the catalyst; the main purpose is to cool the oil and gas, otherwise it would cause flooding of the tower. Lowering the tower is done to regulate the temperature at the bottom of the tower and prevent high-temperature coking.

Reply #42009-12-26

The upward flow serves to wash the catalyst and remove excess heat, while the downward flow is used to control the temperature at the bottom of the tower

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