Global warming represents substantial and severe challenges for human beings today. As one of the most worth ways to slowing the global warming, Carbon Capture Utilization and Storage (CCUS) is promising technology receiving more attention. As an important link, CO₂ should be safe transportation from capture point to storage point. Pipeline transportation is most economical and more research is required to ensure safe operation. To carry out large-scale pipeline safety studies, a 258 m long and 233 mm inner diameter pipeline was built and many pressure sensors and several thermocouples were used to measure the many parameters during the CO₂ release process. This paper, the dense CO₂ was released from the diameter of 50 mm release orifice. And multi-dimensional characteristic of CO₂ had been focused during the release from the pipeline. The temperature was measured through six cross sections inside pipeline and the temperature evolution on each cross section was obtained. At each point temperature evolution deviated from overall trend gradually from top to down at each cross section. The evolutions of phase and density were obtained using the temperature and pressure data. When the CO₂ phase transformed into gas-liquid phase, the phase of CO₂ maintained at gas-liquid phase for a moment. At each cross section, the phase transformed from gas-liquid to gas gradually from up to down. At far away from the release part of pipeline, the phase evolution transformed at triple point. In addition, at the beginning of the release period, the density evolution was drastic, and with the experiment continued the density evolution became more gradual. Sound was created during the release process. Hence, the value of sound was measured around the release orifice and evolution of sound was discussed.

全球变暖是当今人类面临的严峻挑战。作为减缓全球变暖最有价值的方法之一，碳捕集利用与封存（CCUS）技术有望获得更多关注。作为一个重要的环节，CO ₂应该是从捕获点到储存点的安全运输。管道运输是最经济的方法，需要进行更多的研究以确保安全运行。为了进行大规模的管道安全研究，建造了一条258 m长，233 mm内径的管道，并使用了许多压力传感器和数个热电偶来测量CO ₂释放过程中的许多参数。本文中的致密CO ₂从直径为50毫米的释放孔释放。在管道释放过程中，CO _2的多维特性受到关注。通过管道内部的六个横截面测量温度，并获得每个横截面上的温度变化。在每个点处，温度演变在每个横截面上从上到下逐渐偏离整体趋势。利用温度和压力数据获得相和密度的变化。当CO ₂相变换成气-液相中，CO的相位₂保持在气-液状态片刻。在每个横截面处，相从气-液转变为气体，从上到下逐渐转变。在远离管道释放部分的地方，相变在三点发生了转变。另外，在释放期开始时，密度变化剧烈，并且随着实验的进行，密度变化变得更加渐进。在发布过程中创建了声音。因此，在释放孔周围测量了声音的值，并讨论了声音的演变。