In negative pressure distillation, how is the flow rate of the forced circulation pump in the reboiler at the bottom of the tower determined?
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Forced-circulation reboilers are typically used to handle materials at the bottom of a tower that are heat-sensitive or prone to coking. What determines the flow rate of the pump used for circulation in the tower bottom?
First, determine the heat load required for distillation, then determine the vaporization fraction of the reboiler; forced circulation is generally set at less than 3%.
Wouldn’t that mean the calculated traffic volume would be very high? 3% or less is way too low For example, if my evaporation rate is 500 kg/h, wouldn’t that mean I need to choose a pump with a capacity of 15 m³? In reality, we’re only using 3 m³ in operation, right?
As I understand it, the forced circulation pump itself has a low vaporization rate; flash evaporation takes place inside the tower, which increases the vaporization rate.