1. The maximum pressure drop of the

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.