Dense-phase carbon dioxide pipeline safety discharge system

The utility model discloses a dense-phase carbon dioxide pipeline safety release system which comprises a dense-phase carbon dioxide pipeline conveying and cutting system, a valve chamber bypass system, a two-stage release system and a pipeline temperature and pressure detection system. And an interstage heat exchange system is arranged in the two-stage discharge system and is used for adjusting the temperature of the medium discharged from the previous stage. Based on the operation process characteristics of a dense-phase carbon dioxide pipeline, in combination with a conventional oil productpipeline overhauling and discharging scheme, the characteristics of low-temperature solidification of dense-phase carbon dioxide are considered, and units such as a two-stage discharging system, an inter-stage heat exchange system, a trunk line temperature detection system and a control system are arranged; the risk formed by dry ice of the dense-phase carbon dioxide pipeline emptying system is effectively avoided, the m