1.气体状态下管道的压降最大，有效输送距离仅为37.5km；当距离超过

1.气体状态下管道的压降最大，有效输送距离仅为37.5km；当距离超过204.4km时，液态管道会出现两相流体，粘度会增加，管道的摩擦阻力增加，最终导致压降的增大，而超临界二氧化碳管道将会一直保持其较小的压降，且压降也呈线性增长方式，因此， 单独从压降方面考虑，超临界状态管道输送由于气态和液态。超临界二氧化碳管道中介 质温度降至临界点30.95℃时，压力为12.9 MPa，此时管道的输送长度为128.1 km，随 着管道长度的继续增加，介质的超临界性就会破坏，但是管道的压力还处于较高的水平， 完全能够满足现场的实际应用需求，当达到规定的压降即进口的5%时，输送距离会达 到1010km，因此若对超临界条件要求不高，完全可以满足实际生产。

1. The maximum pressure drop of the pipeline under gas state, with an effective conveying distance of only 37.5km; When the distance exceeds 204.4km, a two-phase fluid will appear in the liquid pipeline, and the viscosity will increase. The frictional resistance of the pipeline will increase, ultimately leading to an increase in pressure drop. However, the supercritical carbon dioxide pipeline will always maintain its small pressure drop, and the pressure drop will also increase linearly. Therefore, considering the pressure drop alone, the transportation of supercritical pipelines is due to the gas and liquid states. When the temperature of the medium in the supercritical carbon dioxide pipeline drops to the critical point of 30.95 ℃, the pressure is 12.9 MPa, and the transportation length of the pipeline is 128.1 km. As the pipeline length continues to increase, the supercritical nature of the medium will be destroyed. However, the pressure of the pipeline is still at a high level, which can fully meet the practical application needs on site. When the specified pressure drop, which is 5% of the inlet, is reached, the transportation distance will reach 1010 km, Therefore, if the requirements for supercritical conditions are not high, it can fully meet the actual production.

1. The pressure drop of the pipeline is the largest in gas state, and the effective transportation distance is only 37.5km；; When the distance exceeds 204.4km, two-phase fluid will appear in the liquid pipeline, the viscosity will increase, the friction resistance of the pipeline will increase, and finally the pressure drop will increase, while the supercritical carbon dioxide pipeline will always maintain its small pressure drop, and the pressure drop will also increase linearly. Therefore, considering the pressure drop alone, the pipeline transportation in supercritical state is due to gas and liquid. When the temperature of the medium in the supercritical carbon dioxide pipeline drops to the critical point of 30.95℃, the pressure is 12.9 MPa, and the transportation length of the pipeline is 128.1 km. With the continuous increase of the pipeline length, the supercritical nature of the medium will be destroyed, but the pressure of the pipeline is still at a high level, which can fully meet the practical application requirements on site. When the specified pressure drop is 5% of the inlet, the transportation distance will reach 1010km. Therefore, if the supercritical conditions are required,