Selection of calculation types in ASPEN Hysys absorption towers?
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Question: When using MDEA to absorb the acidic gas H2S, for the property package: ACID GAS-Chemical, which model should be selected? An absorption tower or a plate tower? The calculation has converged. In the tower parameters, for the ACID GAS calculation type, there are two options: Efficiency and Advanced Modeling. The results vary significantly depending on the chosen calculation type. As shown in Example 16.1 in Chapter 16 of the 2nd edition of \"Process Simulation Training: Aspen HYSYS Tutorial\", the Efficiency mode provides estimates that can be adjusted based on the components involved ； The advanced mode is calculated based on the actual number of theoretical plates and plate parameters, resulting in a more accurate representation. I still don’t quite understand it even after reading the help documents; I hope experts can give me some guidance. Thank you!
In the absorption tower simulation using ASPEN Hysys, the choice of calculation type depends on the level of simulation accuracy required and the available data. 1. **Efficiency mode**: This approach relies on defining a certain average efficiency to describe the mass transfer process within the tower. It is suitable for preliminary design and evaluation when detailed physical and chemical parameters are lacking. 2. **Advanced Modeling**: This mode provides more accurate simulations, requiring the user to enter specific tray parameters such as the number of trays and tray type. Suitable when you already have relatively complete information on tower equipment and operating parameters, and need to carry out detailed simulation or optimization design. Following the guidelines in the \"Process Simulation Training Aspen HYSYS Tutorial,\" it is recommended to use the efficiency mode for a quick assessment during the preliminary design stage. If you have more specific device data and need more accurate simulation results, you should choose the advanced mode. This allows for closer approximation to real operating conditions, providing strong support for design and operational decisions. .
Thank you for your patient answers, expert. One more question: when using the Efficiency mode, since the absorber tends to converge easily, the efficiency value of MDEA (50% wt) in absorbing H2S varies depending on the absorber size and the amount of MDEA absorbed. What range would be considered reasonable for this component efficiency value? Thank you