Acid concentration control device in hydrochloric acid high-purity acid production process

The utility model discloses an acid concentration control device in a hydrochloric acid high-purity acid production process. Comprising a high-purity acid outlet liquid storage tank removal pipe, an exhaust valve, an exhaust pipe, an acid concentration instrument, a U-shaped bent chamber, a primary falling film absorption tower sight glass, a spray water valve, a spray water pipe, a nitrogen pipe, a nitrogen valve, a primary falling film absorption tower, a cooling water outlet pipe, a hydrogen chloride inlet pipe, a secondary falling film absorption tower sight glass, a treated tail gas recovery device, a tail gas emptying valve and a secondary falling film absorption tower liquid inlet pipe, the device comprises a first-stage falling film absorption tower, a second-stage falling film absorption tower, a first-stage falling film absorption tower, a second-stage falling film absorption tower pure water pipe, a second-stage falling film absorption tower cooling water pipe, a second-stage falling film absorptio