complex cross-feed and parallel-feed multi-evaporation systems for conventional design was first established to lucubrate on disciplinarian and influential factors of multi-evaporation. In this model, the energy-saving measures, such as extra steam being led off to preheat material liquid, the condensation water flash and solution flash, were adopted. The solid separation was also considered in the process of evaporation and solution flash. Material balance and energy balance equations of complex cross-feed...