A dynamic model of the Tube Digester System in Alumina (TDSA) production was developed by using Matlab/Simulink package. A novel workflow simulation method based on Virtual Operating Environment (VOE) was proposed, and a prototype system based on a commercial control-build software was presented. In order to increase the reliability and visibility of simulations, animations demonstrating the simulation process were studied. Based on the workflow virtual operating environment, the simulation engine can impel the workflow running and deal with semi-automatic or manual activities automatically. The workflow simulation model of TDSA can be used to assess the performances of operating processes, diagnose the existing process and provide qualitative and quantitative analysis for the optional retrofit methods.

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