The liquid carbon dioxide pipeline has been absorbing heat from the environment for the first 204.4km, causing its own temperature to rise. However, through pressure analysis, when the distance exceeds 204.4km, due to the decrease in pressure, gas-liquid two-phase flow occurs, and the influence of the Joule Thomson effect becomes prominent, causing the temperature of the fluid in the pipeline to decrease compared to before. As shown in the figure below, the curve will slightly upward.<br>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. Therefore, to maintain supercritical transportation, the effective transportation distance for one pressurized heating is 128.1 km, and further heating treatment is required, However, in general, when the pipeline distance exceeds 128.1km, the pressure accumulated by the pipeline is still at a relatively high level, which can fully meet the actual application needs on site. When the specified pressure drop, which is 5% of the inlet, is reached, the transportation distance will reach 1010km. Therefore, if the requirements for supercritical conditions are not high, it can fully meet the actual production needs.
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