Plate hydraulic performance data
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I work in the field of equipment engineering, and I often come across data related to the hydraulic properties of trays. I would like to ask the experts here to help explain the meaning of the following values. Thank you. 1. Foam entrainment rate: 1.27% 2. Liquid leakage rate: 1.33% 3. Spray flooding rate: 43.9% 4. Downcomer flooding rate: 62.9% 5. Operating/downcomer velocity: 4.34
No one has told me, so I’ve guessed the meaning myself; I’m not sure if it’s correct or not. 1. Foam entrainment rate of 1.27%: The gas velocity at the valve opening is 1.27% of the velocity required to cause foam entrainment. 2. Liquid leakage rate of 1.33%: It represents 1.33% of the liquid flow rate that results in liquid leakage at the valve opening. 3. Spray flooding rate of 43.9%: The gas velocity at the valve opening is 43.9% of the velocity necessary to cause flooding. 4. Downcomer flooding rate of 62.9%: Flooding occurs due to the small area of the downcomer channel; the area responsible for this flooding is 62.9% of the actual downcomer area. 5. Operating/downcomer velocity of 4.34: ? What are everyone’s opinions?
1. The mist entrainment rate should generally be kept below 10%; of course, the lower it is, the better. This refers to the ratio of the amount of liquid carried to the previous tray due to an excessive gas phase load. 2. The liquid leakage rate should generally be kept within 10%; of course, the lower it is, the better. This refers to the proportion of liquid that leaks to the next tray due to an insufficient gas phase load. 3. The liquid spray rate should generally be kept within 30% to ensure effective contact, mass transfer, and separation between the gas and liquid on the tray. 4. The flooding rate in the downcomer should generally be kept below 50%, to ensure effective mixing and separation of gas and liquid within the downcomer, while preventing flooding. 5. The operation/fall hole velocity is an indicator that must be adjusted by modifying the opening rate and controlling the gas-phase flow velocity in order to prevent leakage.