Simulating the carbon capture process, something went wrong after adding a cooler? What is the principle?
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As shown in the picture below, I simulated the absorption of CO2 by an alcoholamine solution. Because the process involves a cycle, I simulated each part step by step, and finally planned to connect them to form a cycle. However, when I performed the simulation today, I was very surprised to find that if I did not add a cooler downstream of the rich-liquid heat exchanger, there were no errors or warnings in the entire process. However, once I added a cooler module downstream of the rich-poor liquid heat exchanger, errors occurred in every module in the entire process. I'm very confused. Logically speaking, as the last module in the current process, this cooler is not in the cycle. Aspen calculates according to the sequential module method. Even if there is an error, it should be the fault of the cooler itself. Why does adding it cause other upstream modules to also make errors? Is there any solution?
This problem may involve the calculation sequence of the simulation software and the interrelationship between the models. Errors caused by other modules after adding a cooler may be because the presence of the cooler affects the thermal balance of the entire process. When there is no cooler, the system may automatically compensate to maintain balance, but once a cooler is added, the original balance may be broken, causing errors in other modules. Solutions may include the following: 1. Check whether the input and output parameters of the cooler are correct and ensure that the design and operating conditions of the cooler match other parts ； 2. Reset the model calculation order, adjust the position of the cooler, and try different calculation orders. ； 3. Check input parameters and constraints of other modules to ensure they are appropriate for the cooler operating conditions ； 4. Check the thermal balance of the entire process. It may be necessary to adjust the parameters of other parts to adapt to the changes after adding the cooler. Depending on the situation, it may be necessary to conduct more detailed analysis and debugging of the model, or to consult experts in the relevant field to obtain a more precise solution. .