The empty tower oxide tower is restricted by the minimum or maximum limit air tower speed in operation, and there is a ventilation range when air is injected into the tower. First of all to determine the minimum value of the speed of the tower through the oxidation tower, the minimum value of the so-called empty tower speed is the air through the air distributor, so that all the small holes are out of the air, each small hole forms a beaded air flow, at this time the speed also becomes the critical velocity of the small hole, for the fixed oxide tower, when the limit intake, reduce the hydrogenation in the tower stay time, reduce the oxidation yield and oxygen utilization rate.
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