To realize intelligent control for zero discharge of flue gas desulfurization(FGD)wastewater in thermal power plants

this paper proposed a FGD waste water evaporation treatment method using automatic control and protection logic.This method takes use of the thermal energy of the flue gas in front of and behind the air pre-heater(AHP)to carry out evaporation treatment of the desulfurization waste water.This control system is a cascade control system with a feedforward control.The feedforward control keeps the flue gas temperature of at the electrostatic precipitator(ESP)inlet in a suitable range by controlling the initial opening degree of the valves on the pipes in front of and behind the AHP.The cascade control system ensures a long-term stable operation of the whole system.Moreover

the corresponding protection logic is designed.This control system can significantly reduce the complexity of the operation and reduce the risk of human mistakes

which is conducive to the stable and economical operation of the FGD wastewater evaporation system.