Pressure relief system and method for planned release of high-pressure CO2

The invention discloses a pressure relief system for planned release of high-pressure CO2, which belongs to the technical field of CO2 capture, utilization and storage engineering and comprises a release manifold, the upstream of the release manifold is communicated with high-pressure carbon dioxide equipment and a high-pressure carbon dioxide pipeline, and the downstream of the release manifold is communicated with an emptying arm. A pressure relief device is arranged at one end, far away from the relief manifold, of the emptying arm, so that the high-pressure carbon dioxide is directly sprayed into the atmosphere after passing through the pressure relief device, and the invention further discloses a pressure relief method for planned relief of the high-pressure CO2. The method that the pressure relief device is arranged at the tail end of the relief pipeline is adopted, dry ice formed after pressure reduction of high-pressure carbon dioxide is directly sprayed into the atmosphere, the problem that the dry i