Aspen model debugging
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In the model that has just been created, errors or warnings always appear after it is run. Could you please tell me how to deal with these errors or warnings, what needs to be adjusted, and what causes them? Especially when there is a material imbalance, how should it be resolved? Block: B1 Model: FSPLIT * WARNING: NO FEED TO THE BLOCK. THE BLOCK IS BYPASSED. Block: RDC Model: RADFRAC *** SEVERE ERROR: A liquid feed/pumparound is required at the top stage when “Q1=0” is specified in the “COL-SPECS”; however, the required feed/pumparound has zero flow. Block: RDC Model: RADFRAC *** SEVERE ERROR: The composite feed flash calculation did not converge; supply T-EST, X-EST, and Y-EST are being used as a workaround. ** ERROR: The RDC block is not in mass balance – mass inlet flow = 0.71294976E-03, mass outlet flow = 0.00000000E+00; absolute difference = 0.71294976E-03
This post was last edited by luckstar88 on 2011-5-13 18:58. Reply to 1# 731271733: There should be no feed stream for the first one, so the fsplit module is ignored. The second issue is also the lack of feed at the top of the tower. It might be related to the previous error; fsplit didn’t allocate any fluid. The third one is related to feed flashing. Combined, these factors result in a loss of material conservation in the tower.
What does “Q1=0” IS SPECIFIED IN “COL-SPECS” mean in Article 2? Is there such an option as COL-SPECS?