(Paid) Please, someone help save the child – ASPEN PLUS experiences errors during normal operation
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An error occurred in the atmospheric pressure column during ASPEN PLUS operation: ***SEVERE ERROR VAPOR OR LIQUID FLOW ON STAGE 39 IS TENDING TO DISAPPEAR. PLEASE REVIEW REFLUX/BOILUP SPECIFICATIONS, AND DUTY SPECIFICATIONS FOR HEATERS AND/OR PUMPAROUNDS. Does this mean that the calculation is not converging? It is now also possible to simulate the result, which is an error in the atmospheric pressure tower. Based on previous posts, I adjusted the flow rates at each outlet, the pump reflux, the number of iterations, and the tearing stream parameters – none of these worked. Please, someone experienced, help me figure out what the problem is and how to solve it. It can be paid for! Thank you so much! !
There is no material left on tray No. 39. You should set up some rules; try to cancel them first to see if convergence occurs, and then establish the rules one by one – don’t set too many at once
Hello, are you referring to the side-stream flow rate that has been set?
The model for each tray in ASPEN distillation is based on gas-liquid equilibrium calculations; therefore, flow rates for both the gas phase and the liquid phase are necessary. If either of these flow rates is 0 or close to 0, ASPEN will not be able to perform calculations for that tray and an error will occur. The solution is to increase the flow rate of the component that is 0, for example, in the case of absorption gases, if the gas flow rate is 0 (meaning absorption has been completed), then adding some inert gas that cannot be absorbed to the gas stream will resolve the issue