Convergence for a recycle stream is defined as that point in the calculation cycle at which the values of composition, temperature, and pressure for either recycle (tear) stream or all streams have not changed more than a prescribed tolerance from the previous calculation values.
- PRO/II has default values for recycle tolerance which the user may alter if desired. The defaults for convergence are described in the General Data section of the PRO/II Input Manual.
- To alter the recycle tolerances, in the General data section, use:
TOLER STREAM=0.01,-1.0,0.01,0.01,TEMP=-0.1,PRES=0.005
About PRO/II: PRO/II is the major product in the Process Engineering Suite (PES). This process simulation software optimizes plant performance by improving process design, operational analysis, and performing engineering studies. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes. PRO/II allows users to evaluate the use of heat integration with case studies, rigorously evaluate process improvements with the help of a process flow diagram (PFD), or model crude distillation units. PRO/II offers a wide variety of thermodynamic models to virtually every industry and is incredibly cost effective, decreasing both capital and operating costs.
Technical Support: As always, feel free to reach out to your local technical support team for more information.
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