Hydrogen chloride synthesis furnace tail gas absorption system provided with explosion-proof device

The invention discloses a hydrogen chloride synthesis furnace tail gas absorption system provided with an explosion-proof device, which comprises a primary falling film absorber, a secondary falling film absorber and a tail gas absorption tower, the waste gas discharge pipeline between the first-stage falling film absorber and the second-stage falling film absorber is connected with a nitrogen source through a nitrogen main pipeline, an electromagnetic regulating valve electrically connected with the PLC is mounted on the nitrogen main pipeline, and a first stop valve and a second stop valve are mounted on the nitrogen main pipeline on the left side and the right side of the electromagnetic regulating valve; one side of the nitrogen main pipeline is connected in parallel with a nitrogen branch pipeline. By means of the valve set composed of the waste gas pipeline stop valve, the first stop valve, the electromagnetic adjusting valve and the second stop valve and the PLC, nitrogen can be filled in time accordin