Device for removing free chlorine in light salt brine and dechlorination method thereof

The invention discloses a device for removing free chlorine in light salt brine and a dechlorination method thereof. The device comprises a dechlorination tower, wherein one side of the upper end of the dechlorination tower is fixedly connected with a first light salt brine inlet pipe, one end of the first light salt brine inlet pipe is connected with a mixing pipeline through a flange, and the end, close to the mixing pipeline, of the first light salt brine inlet pipe is connected with a first short pipe; one end of the first short pipe is fixedly connected with a pH value online analyzer, and the upper end of the dechlorination tower is fixedly connected with a chlorine outlet pipe. According to the device for removing the free chlorine in the light salt brine and the dechlorination method thereof, the mixing pipeline is additionally arranged between the first light salt brine inlet pipe and the second light salt brine inlet pipe, before the light salt brine enters the dechlorinationtower, hydrochloric acid