I did a pretty simple simulation of an exothermic reaction using RPlug in Aspen plus. Initially the feed was heated using a heater block. Since the reaction is exothermic, I tried to use the reactor product stream to heat the reactor feed using heat exchanger block in aspen plus. After replacing the heater with heat exchanger, the simulation converged fairly easily, at first. But once I purge the simulation results, I cannot get the simulation converged again. Any idea how can I get the simulation converged after purging the results.??
Have you tried manually converging the recycle by putting in a closed valve and and manually adjusting the rate and composition of the "recycle" stream to see what is causing it to diverge?
It's solved now, the problem was either due to the design-spec block or the reactor volume. I put fairly large volume of reactor (with design-spec disabled) to get it converged, and then decreased the volume of reactor to the desired value after reactivating the design-spec.
I do not think you needed to remove the heater instead you keep the two but instead of eliminating one, you can introduce a controller (using logic blocks) to either adjust the heating role played by the heater when once the product stream is ready for the heat exchanger or to completely switch off the heater. Zeeshan Uddin
Thank you all, this issue has log been dealt with. but still thanks for your suggestions.
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