Inputs regarding the chemical reactions in the absorption tower
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For PDS desulfurization, in addition to the absorption of H2S and HCN, there is a characteristic reaction during the absorption stage: NaHS + NaHCO3 + (x-1)S = Na2Sx + CO2 + H2O (x=1,2,…,8). When this reaction is added to the process, the calculation does not converge. The report reads as follows: Block: B1 Model: RADFRAC *** SEVERE ERROR: AN INVALID FORTRAN OPERATION WAS ENCOUNTERED. The calculations were terminated due to internal errors in ASPEN PLUS. How can this problem be resolved?
Use multiple tunes; Aspen comes with many examples of reaction, absorption, and convergence, or you can use files.