State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081 Beijing, China.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081 Beijing, China.
J Hazard Mater. 2018 Jan 15;342:634-642. doi: 10.1016/j.jhazmat.2017.09.002. Epub 2017 Sep 5.
The sudden rupture of a vessel containing liquefied carbon dioxide (CO) can generate a boiling liquid expanding vapor cloud explosion (BLEVE). The entire evolution process and mechanism of CO BLEVE has not been fully characterized, and its influencing factors have not been systematically examined. In this study, the ejection process and microphase change process in the vessel were recorded by a high-speed camera. Within 20ms, the pressure peaks surpassed the initial values and were considered to be the initiation of a sequence that generated a CO BLEVE under certain conditions. In addition, a critical relief caliber with a diameter of 8mm was observed under the initial burst pressures of 3 and 5MPa. This critical relief caliber is essential for risk control and management. About 52ms after the rupture, a heterogeneous nucleation center was formed in the liquefied CO in the vessel. Subsequent nucleation center extension and swelling generated another pressure peak. The pressure peak did not surpass the initial pressure value. However, this phenomenon did not eliminate any possible connections between the heterogeneous nucleation process and the CO BLEVE. If the conditions had been proper, the explosion could have happened.
容器中液态二氧化碳（CO）的突然破裂会产生沸腾液体扩展蒸汽云爆炸（BLEVE）。CO BLEVE 的整个演化过程和机制尚未完全描述，其影响因素也尚未系统地研究。在这项研究中，高速摄像机记录了容器内的喷射过程和微相变过程。在 20ms 内，压力峰值超过了初始值，被认为是在一定条件下引发 CO BLEVE 序列的开始。此外，在初始爆破压力为 3 和 5MPa 时，观察到了直径为 8mm 的关键释放口径。这个关键释放口径对于风险控制和管理至关重要。在破裂后约 52ms，容器内的液态 CO 中形成了异质成核中心。随后的成核中心扩展和膨胀产生了另一个压力峰值。压力峰值没有超过初始压力值。然而，这种现象并没有排除异质成核过程和 CO BLEVE 之间的任何可能联系。如果条件合适，爆炸可能会发生。
