Li Zheng, Lu Langqing, Yao Min, Wang Zhilei, Luo Zhenmin, Huang Qianrui, Liu Tongshuang, Pan Xuhai
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, China.
ACS Omega. 2024 Aug 21;9(35):36961-36968. doi: 10.1021/acsomega.4c00357. eCollection 2024 Sep 3.
Syngas, composed of hydrogen and carbon monoxide, serves as an alternative fuel for hydrogen energy and a key raw material for chemical synthesis. However, due to its flammable nature, syngas poses risks of forming explosive mixtures in the event of a leak. This study explores potential accident scenarios in coal chemical environments involving syngas reaction vessels. Experimental investigations focus on the overpressure and propagation dynamics of jet flames resulting from syngas leakage, with CO volume fractions ranging from 50 to 80% and release pressures between 2 and 5 MPa. Results reveal that maximum flame overpressure occurs within a CO volume fraction range of 55-65%, with no consistent relationship observed between overpressure and CO fraction at fixed release pressures. During our experiments, the maximum recorded overpressure of 28.4 kPa was reached during vented explosions. Additionally, ignition outcomes categorize into three types based on flame propagation speed: combustion/flare, resembling normal deflagration; and high-velocity deflagration, characterized by rapid propagation and potential for steady jet fire formation. While shockwave-like features may be observed, these do not indicate true detonation. These findings offer insights for the safe handling and storage of syngas.
合成气由氢气和一氧化碳组成，是氢能的替代燃料以及化学合成的关键原料。然而，由于其易燃性质，合成气一旦泄漏就有形成爆炸性混合物的风险。本研究探讨了涉及合成气反应容器的煤化工环境中的潜在事故场景。实验研究聚焦于合成气泄漏导致的喷射火焰的超压和传播动力学，其中一氧化碳体积分数范围为50%至80%，释放压力在2至5兆帕之间。结果表明，最大火焰超压出现在一氧化碳体积分数为55%至65%的范围内，在固定释放压力下，超压与一氧化碳分数之间未观察到一致的关系。在我们的实验中，通风爆炸期间记录到的最大超压为28.4千帕。此外，根据火焰传播速度，点火结果可分为三种类型：燃烧/闪光，类似于正常爆燃；以及高速爆燃，其特征是传播迅速且有可能形成稳定的喷射火焰。虽然可能会观察到类似冲击波的特征，但这些并不表明真正的爆轰。这些发现为合成气的安全处理和储存提供了见解。
