How to determine the number and diameter of oil collection tanks in a tower?
Thread Content
May I ask how to determine the diameter of the oil collection tank in a fractionation tower? The master said that it needs to be calculated based on the gas-liquid phase load; I still don’t quite understand it. Please give me some guidance.
How many oil collection tanks are there? What is their diameter? Oil collection tanks are installed wherever it is necessary to remove material, in areas that do not have liquid collection trays or similar devices. This is determined by the requirements of the process. If the diameter refers to that of the gas lift column in the oil collection tank, then it is required that the F factor for the gas phase passing through this column be no greater than 6; meanwhile, the volume of the collection ring formed by the gas lift column and the tower wall must ensure an appropriate residence time for the liquid phase. The residence time varies depending on the specific operating conditions.
Thank you. I was a bit vague; what I mean is the number and diameter of the vent pipes in the oil collection tank. So how exactly should it be calculated?
The F factor (Pa^0.5) = gas flow velocity (m/s) × square root of gas density (Kg/m3). F = V * ρ^0.5, where the gas flow velocity V is equal to the gas volume flow rate divided by the gas flow area. The number of vent pipes in a large-diameter oil collection tank can range from one to several dozen; it depends on the specific circumstances. Would you like us to carry out the design?
The master has shown you the way; he hopes that through the hints he gives, you will be able to use the principles of chemical engineering you’ve learned to conduct your own analyses, so as to understand not only the results but also the reasons behind them. What a great master. Back then, my master would often give some hints, provide a book……
The area of the vent holes in the oil collection tank should be 1.2 to 1.5 times greater than the opening ratio of the tray plates. The number of vent holes is related to the diameter of these holes, and as many holes as possible should be used.