How is the operational flexibility of a tower calculated?
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I would like to ask the experts: how is the operational flexibility of a tower determined? Thank you
The ratio of the upper limit to the lower limit of the vapor load is referred to as the operating flexibility of the tower
The operating flexibility can also be expressed as the ratio of the current amount of gas or liquid being used to the upper or lower limit.
Operational flexibility refers to the range between the minimum allowable value of the rising gas velocity (lower load limit) and the maximum allowable value (upper load limit). When the upward gas velocity varies within this range, the distillation tower can maintain normal operation while achieving a certain level of separation efficiency. The upper limit on the load of the distillation tower is determined by ensuring that the amount of mist carried away by the rising steam does not exceed 10% of the steam flow rate ； The lower load limit is set such that the liquid leakage from the tray does not exceed 10% of the liquid flow rate. Generally speaking, float valve columns have the greatest operating flexibility; some tests show that the ratio of the upper load limit to the lower load limit can be around 7 to 9. Bubble cap columns come next, while tray columns have the lowest flexibility.