Capacitive deionization technology for simulating the rotor cooling water treatment of synchronous condenser

Capacitive deionization(CDI) technology is a new and efficient water treatment technology with the advantages of low energy consumption, high efficiency, low cost, green and pollution-free, and renewable electrodes. CuSO4 solution was prepared to simulate rotor cooling water, and the feasibility of CDI technology based on activated carbon electrodes for synchronous condenser rotor cooling water was explored through a series of indicators such as solution conductivity, Cu2+ removal rate, energy consumption, and cycling stability. The results showed that after CDI treatment, the conductivity of the simulated rotor cooling water reached 4.1 μS/cm, the Cu2+ removal rate was 100%. The effluent was transparent, pure and free of mechanical impurities, which met the water quality control standards specified in the “Guidelines for Internal Cooling Water Treatment of Generators” (DL/T 1039-2016). The activated carbon electrode after adsorption of Cu2+ was characterized by SEM and XPS, and showed the presence of copper element on the carbon material. Further discussion and analysis of the electro-adsorption mechanism were conducted through the adsorption kinetics model, and the results showed that the adsorption behavior was more in line with the pseudo-first-order kinetics model. It was speculated that the adsorption of Cu2+ by the electrode was mainly physical adsorption mechanism.