Chlorine-containing dilute sulphuric acid recycling and regenerating device

The utility model relates to the technical field of PVC (polyvinyl chloride) production, in particular to a chlorine-containing dilute sulphuric acid recycling and regenerating device which comprises an electrolytic dilute sulphuric acid tank, a dechlorination tower, a vacuum pump, a dilute sulphuric acid storage tank, an acetylene cleaning tower and a cracking furnace, a second feeding end of the electrolytic dilute sulphuric acid tank is fixedly communicated with a sodium sulfite pipeline, a first dechlorination pipeline is fixedly communicated between a discharging end at the bottom of the electrolytic dilute sulphuric acid tank and a first feeding end at the upper part of the dechlorination tower, and a second feeding end of the dechlorination tower is fixedly communicated with an air pipeline; a second dechlorination pipeline is fixedly communicated between the bottom discharge end of the dechlorination tower and the third feed end of the electrolytic dilute sulfuric acid tank; and a first vacuum pipelin