As can be seen from the above figure, when the length of the pipeline is less than 100km, the two impurities have little influence on the performance of the pipeline. This is because the pressure and temperature of the medium do not change obviously when the distance is short, and the mixed medium shows the property close to pure carbon dioxide when the external disturbance is small. However, with the increase of the pipeline distance, the temperature and pressure will change greatly, and the effects of nitrogen and methane impurities on the pressure drop and temperature drop of the pipeline will be obvious, and the influence effect will be further intensified with the further increase of the pipeline transportation distance.<br> Different contents of nitrogen and methane have different effects on pipeline performance. With the content increasing from 0.5% to 2%, the influence of these two impurities on temperature drop and pressure drop will increase, and the influence of nitrogen methane is greater than that of methane. Therefore, these two components should be monitored in the actual transportation process, especially nitrogen, and their existence should be avoided as far as possible.
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