Model selection and parameter setting for atmospheric and vacuum distillation of crude oil in Aspen simulation
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Hello, everyone from Sichuan! I am currently using AspenV11.1 to simulate the atmospheric and vacuum distillation process of crude oil. I encountered very tricky difficulties during the simulation process. I earnestly ask my senior colleagues, seniors, and friends to help me out. Thank you so much! The question is as follows: 1. When simulating the initial distillation column (20 trays), with feeding at the middle of the column (15 trays), there is no stripping steam at the bottom of the initial distillation column, nor is there a reboiler or any pumping circulation – only outlet at the bottom of the column. How should this be set up in Aspen? 2. When simulating the initial distillation column, atmospheric pressure column, and vacuum column, there is no condenser at the top of the column; only the gas phase flows out from there. Afterwards, this gas phase exits the column and undergoes air cooling and wet cooling, with part of it returning to the first tray at the top of each column. How should this be set in Aspen? 3. For atmospheric and vacuum distillation columns, there is mid-stage reflux and side-line extraction – how is the column efficiency for each tray determined? I earnestly ask everyone to give me some valuable suggestions. Thank you! ! ! Thank you again! ! !
Will you select the modules in the column of the model library in Aspen? Select the appropriate modules and set the parameters such as temperature, pressure, and flow rate. It seems like you’re not very familiar with Aspen; within the module settings, there are various sub-components, and these sub-components include settings related to mid-stream reflux and side-stream extraction, specifying which plates to use for these processes. I’m a beginner and don’t understand much about these things
I can basically handle the basic module selection and parameter setting, but could you explain it in more detail? My QQ number is 309554513. Thank you!
This post was last edited by sjkg2 on 2011-1-28 at 12:16. You need to read the instructions more carefully; your first question is likely unanswerable: the initial distillation tower takes in material at its bottom, with a sampling point in the middle. How can feeding occur in the middle of the tower? When feeding is done in that area, there are no rising gases below the feeding plate; as a result, the conditions for vapor-liquid contact on the tray are lost. Correction: There are indeed several trays below the feed inlet of the initial distillation column; there is no rising gas phase there, nor any vapor-liquid contact. I don’t understand what the logic behind this design is I hope experts can provide an answer.
Aspen is relatively difficult to get started with; it’s better to use Unisim Design or HYSYS, especially for oil refining tasks
1. Generally, a primary distillation tower has vapor stripping steam inlets at its bottom, but there are not many of them. During simulation, the feed can be fed directly into the bottom of the tower, and the next 5 plates can be ignored. 2. When simulating a primary distillation tower or an atmospheric pressure tower, it is necessary to choose a tower top equipped with a condenser; setting the tower top as a fractional condenser will suffice. There is no vacuum tower; a top pump is used for reflux. 3. The tower efficiency can be set at 70% for the entire tower; after convergence, the efficiency of each section can be adjusted based on the actual temperatures at each outlet. Please refer to it.