Abstract
To effectively process the chemical waste water in power plant, a set of control system based on PLC upgrading and reform for chemical water is designed in this paper. In the process of treating chemical water, there are many operating procedures, complex technology and scattered positions and many pieces of equipment. With remote I/O control thought in this paper, the hot-standby series of PLC of Schneider is used as lower computer to form a set of chemical water treatment system. The subsystem monitoring screens are concentrated in one central control room to achieve remote monitoring and local/remote control on the whole chemical water system. In reform process, aiming at the regeneration link of chemical water desalination process in power plant, a prioritization scheme of single closed-loop control is put forward and simulated in MATLAB. In simulation result, the concentration of Na+ on cation bed is finally maintained to be 8.3µg/L; electric conductivity of water on anion bed is finally maintained to be 0.5µS/cm. This completely meets the standards of water discharge. In conclusion, the chemical water auto-control system based on PLC can not only achieve real-time detection but also raise the work efficiency of power plant. It has certain reference value to further reform on power plant.
