This project is the first set of high salt water zero discharge device for coal chemical industry using domestic technology, and also the first set of high salt water zero discharge device for coal chemical industry using the combination process of reduction and evaporative crystallization. The project includes two sets of devices: reduction device and evaporation crystallization device. Among them, 24 sets of Hertz low-voltage capacitor reactors and 24 sets of thyristor switching regulators are used.