The forced-circulation evaporator is a multi-input and multi-output process with complex dynamics

such as strong nonlinearity

strong coupling.Therefore

the existing conventional control strategy can not satisfy production demand.The dynamic characteristics of forced-circulation were studied.According to the structure characteristics of the evaporator model

decoupling control was achieved by using the global input and output feedback linearization control technology and zero-dynamic stability of system was proved subsequently.Simulation results showed that the global input and output feedback linearization control technology could not only reduce the effect of nonlinearity on the system

but also eliminate the coupling between density loop and level loop.At the same time

the method could improve production quality and evaporation efficiency simultaneously.