The impurity components in carbon dioxide mainly include N2 and CH4, and their presence will inevitably have a certain impact on the transportation performance of pipelines. Therefore, analyzing the performance of mixed gas pipelines containing nitrogen and methane with different molar fractions of 0.5%, 1%, and 2%, Hysys simulation shows that the presence of nitrogen and methane has little impact on the gas and supercritical carbon dioxide pipelines, as shown in the following figure, Their impact on the pressure drop and temperature drop of pipelines in these two states can be ignored, but the presence of nitrogen and methane has a significant impact on liquid carbon dioxide pipelines: