Error analysis of ASPEN simulation for water absorption of sulfur dioxide

When using ASPEN PLUS to simulate absorption towers for the absorption of sulfur dioxide by water, significant differences in the results may be due to the following reasons: 1. Inappropriate selection of property methods: Ensure that property methods capable of accurately describing the properties of liquid and gas phases mixtures are used. For systems containing water and sulfur dioxide, it is recommended to use property models suitable for acidic gases and water, such as NRTL or Electrolyte NRTL. 2. Incorrect operating condition settings: Check whether the operating pressure, temperature of the tower, as well as the flow rate and composition of the feed, match exactly the conditions specified in the case study. 3. Incorrect equipment specifications: Check whether the settings for equipment parameters such as the number of trays and tower diameter are correct. These parameters directly affect the mass transfer area and gas-liquid contact efficiency. 4. Inappropriate selection of mass transfer and equilibrium models: When simulating absorption towers, appropriate mass transfer models (such as the Rate-based approach) as well as equilibrium/non-equilibrium models should be chosen. Different models can have a significant impact on the simulation results. 5. Fit quality and convergence conditions: Check whether all process units have been well fitted and converged. If convergence issues arise, it may be necessary to adjust the solver parameters. Adjustment suggestions: - Check and verify the accuracy of all input data, including material flow rates, composition, temperature, and pressure. - Re-evaluate the selected property method, and switch to another more suitable property model if necessary. - Adjust the specifications of the equipment inside the tower, such as the type of trays and the number of trays, to better match the actual operating conditions. - Simulation is carried out using a rate-based mass transfer model, which can describe the mass transfer process between the gas and liquid phases more accurately. - If convergence issues arise, try adjusting the parameters of the numerical solver, such as the iteration step size and convergence criteria, to improve computational stability and accuracy. After these adjustments, simulation is carried out again and compared with the original data to check whether the error has decreased; the model parameters are then fine-tuned further until satisfactory results are achieved. .

Okay. Thank you, I’ll first adjust it according to your idea