How to achieve many results with few input conditions
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How can this be achieved when there are fewer independent variables than dependent variables in a distillation column? For example, it is required that the quality of the product at the bottom of the tower be better than x, the temperature at the top outlet of the tower be lower than y, and the reflux rate be less than z. What to use as a variable?
This is likely to lead to non-convergence, right?
When designing a tower, generally there are only two variables to choose from (two heat exchangers), but the requirements might involve more than two; in such cases you need to consider what you really need Or what is the key point? Generally, the tower top outlet temperature is adjusted based on the reflux temperature; therefore, you can set your reflux temperature (subcooled reflux), and this does not need to be specified in the definitions – it can be set at the condenser. The separation requirement is generally the most important criterion, so the separation index is usually chosen as the setting condition ； When a reflux rate requirement is present, it is possible to set such a reflux rate; in that case, you need to check whether the separation requirements of the tower can be met under that reflux rate.