Regarding the gas velocity in an empty distillation column
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A is the flooding velocity, B is the empty tower velocity, and C is the actual gas velocity. Under the same gas volume, what is the relationship between these three values? Could you please explain?
I’m not sure what “speed” refers to in A, B, and C of the question What guidance do these three relationships provide for your question? Is it an operation? Is it design? I’m not familiar with design, but if it’s about operation, it would be best if you could directly state the problem you’re facing; that way, I might be able to help.
The flooding speed is the maximum operating limit speed, and the actual speed is generally lower than this value. As for air speed and actual gas velocity, they seem to be the same concept
Will the gas velocity in an empty tower be the same as that during actual operation? That’s impossible
During the design process, the flooding velocity is determined based on parameters such as the amount of gas and liquid and the packing material. From this flooding velocity, the empty tower gas velocity is calculated, and then the tower diameter is determined using that value. Once the tower diameter is known, under actual operating conditions with such a tower diameter and the given amount of gas and liquid, what is the relationship between the actual gas velocity and the two velocities calculated earlier?
As a supplementary note, the gas velocity in an empty tower refers to the gas flow rate without taking into account the internal components and packing of the tower; this value needs to be calculated in practice. Therefore, the actual mass transfer area is smaller than that of an empty tower. Given a constant rise rate of the gas phase, the actual gas velocity is higher than the gas velocity in an empty tower