Compensation device for axial expansion of high-temperature molten urea jacket pipeline

The utility model relates to the technical field of urea conveying, in particular to a compensation device for axial expansion of a high-temperature molten urea jacket pipeline, which comprises an inner conveying pipeline and an outer thermal insulation pipeline, the outer thermal insulation pipeline is arranged on the outer side of the inner conveying pipeline, and the inner conveying pipeline comprises a first axial compensation piece and a plurality of first pipe sections which are arranged at intervals left and right. A first axial compensation piece is fixedly mounted between every two adjacent left and right first pipe sections; the outer heat preservation pipeline comprises a second axial compensation piece, sealing plates and a plurality of second pipe sections arranged left and right at intervals, and the sealing plates are fixedly installed between the inner sides of the ends of the second pipe sections and the corresponding positions of the outer sides of the first pipe sections. The inner conveyin