2. The impurities in carbon dioxide mainly include nitrogen and methane, which have different effects on pipeline performance. When the pipeline length is less than 100km, the two impurities have a smaller impact on pipeline performance. This is because the short distance means that the pressure and temperature of the medium do not change significantly. The mixed medium exhibits similar properties to pure carbon dioxide under small external disturbances, but as the pipeline distance increases, Both temperature and pressure will undergo significant changes, and nitrogen and methane impurities will have a significant impact on pipeline pressure drop and temperature drop. As the pipeline transportation distance further increases, its impact will further intensify.<br>The impact of different concentrations of nitrogen and methane on pipeline performance also varies. As the content increases from 0.5% to 2%, the impact of these two impurities on temperature drop and pressure drop will increase, and the methane content of nitrogen is greater than that of methane. Therefore, in the actual transportation process, these two components should be monitored, especially nitrogen, and their presence should be avoided as much as possible.
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