GONG Yanhai, ZHANG Wei, XIONG Zhihua. Zinc-ion concentration control based on mechanical model of zinc electrowinning process[J]. CIESC Journal, 2013, (12): 4396-4400.
GONG Yanhai, ZHANG Wei, XIONG Zhihua. Zinc-ion concentration control based on mechanical model of zinc electrowinning process[J]. CIESC Journal, 2013, (12): 4396-4400.DOI: 10.3969/j.issn.0438-1157.2013.12.019.
Zinc electrowinning process is a typical large time-delay system
so zinc ion and acid concentration are difficult to control.To overcome the fluctuations of current density and zinc ion concentration in the feed
feedforward-feedback control strategy based on the mechanism model of zinc electrolytic is used.First
based on the model given by Scott
the key parameters such as the mass transfer coefficient are estimated and the energy consumption model is built.Then
a more complete zinc electrowinning process simulation model is established by adding the dynamic balance model of zinc ion concentration in the cell.For the situation such as the changes of current density and fluctuations of feed zinc ion concentration that affect the zinc ion concentration in the cell
feedforward-feedback control strategy is put forward
where the feedback loop uses PID
while the feedforward gain is calculated directly from the mechanistic models.Finally
the control strategy is verified using the simulation model
and the results show that this method is simple and effective.