Method and device for separating boric acid in reactor coolant for nuclear power station

The invention provides a method for separating boric acid in a reactor coolant for a nuclear power station. The method comprises the follow steps: (1) conveying the coolant containing boric acid to a reboiler for heating; (2) conveying the heated coolant to a distillation tower for distillation; (3) condensing the water vapor generated through the distillation to form distillate; (4) backflowing the coolant which is not evaporated to the reboiler for heating, and conducting steps (2)-(3) circularly; and (5) obtaining boric acid concentrate when the mass fraction of boron in the coolant reaches a preset value. According to the invention, a new technology for separating boric acid in the reactor coolant is provided, and the separation effect is good. The invention also provides a device for separating boric acid in the reactor coolant for the nuclear power station.