Grading controllable pyrolysis system for chlorine-containing mixed waste plastics

The utility model relates to a graded controllable pyrolysis system for chlorine-containing mixed waste plastics. The device comprises an extrusion dryer, a first-stage lifting screw conveyor, a second-stage lifting screw conveyor, a catalytic mixing barrel, a semi-plasticizing feeder, a first-stage pyrolyzing furnace, a second-stage pyrolyzing furnace, a third-stage pyrolyzing furnace, a first-stage deslagging screw, a second-stage deslagging screw, a third-stage deslagging screw, a slag storage tank, a combustion chamber, a combustion engine, a first basket filter, a second basket filter, a third basket filter, a first-stage settling tower, a second-stage settling tower, a third-stage settling tower, an air-cooling first-stage heat exchanger, an air-cooling second-stage heat exchanger and an The system comprises water-cooling first-stage, second-stage and third-stage heat exchangers, first-stage, second-stage and third-stage gas-liquid separation tanks, first, second and third oil tanks and a non-condensabl