从上图可以看出，管道长度在100km以内时，两种杂质对管道的性能影响较

从上图可以看出，管道长度在100km以内时，两种杂质对管道的性能影响较小，这是由于距离短是介质的压力和温度都无明显变化，混合介质在外部扰动较小的情况下表现出与纯二氧化碳接近的性质，但是随着管道距离的增加，温度和压力都会发生较大的 变化，氮气和甲烷杂质对管道压降和温降的效果就会明显，且随着管道输送距离的进一步增加，其影响效果会进一步加剧。 <br>不同含量的氮气和甲烷对管道性能的影响效果也不同，随着含量从0.5%增加到2%，这两种杂质对温降和压降的影响会增加，且氮气的甲烷要大于甲烷的影响，因此在实际输送过程中应该对这两种成分进行监测，尤其对氮气的监测，并尽量避免其存在。

From the above figure, it can be seen that when the pipeline length is within 100km, the two impurities have a relatively small impact on the performance of the pipeline. This is because the short distance results in no significant changes in the pressure and temperature of the medium. The mixed medium exhibits similar properties to pure carbon dioxide under small external disturbances. However, as the pipeline distance increases, significant changes in temperature and pressure occur, The effect of nitrogen and methane impurities on pipeline pressure drop and temperature drop will be significant, and its impact will further intensify with the further increase of pipeline transportation distance.<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.

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.