Cao Yong, Su Hao, Ge Lifang, Li Yuyan, Wang Yongxu, Xie Lifeng, Li Bin
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, China.
BGRIMM Technology Group, Beijing, 100081, China.
J Hazard Mater. 2019 Mar 5;365:413-420. doi: 10.1016/j.jhazmat.2018.11.022. Epub 2018 Nov 8.
The ignition sensitivity and flame propagation of zirconium powder clouds are investigated with the influence of initial turbulence. The effect of initial turbulence on the zirconium powder explosion is studied by the change of ignition delay time and dispersion pressure. Hartmann apparatus and Godbert-Greenwald furnace are used to evaluate the minimum ignition energy and minimum ignition temperature, respectively. The high-speed camera is used to analyze the flame propagation behaviors of zirconium powder cloud. The experimental results show that the minimum ignition energy is between 1 mJ and 3 mJ and minimum ignition temperature is 503 K. The ignition energy reaches the minimum value of 30 mJ at the 0.7 MPa. The ignition energy with the effect of ignition delay time has revealed the similar rule. The maximum flame speed increases with the increase of dispersion pressure. Although, the instantaneous flame speed with the lowest dispersion pressure (0.4 MPa) is significantly higher than two others in the early stage of flame propagation.
研究了初始湍流对锆粉云点火敏感性和火焰传播的影响。通过点火延迟时间和分散压力的变化，研究了初始湍流对锆粉爆炸的影响。分别使用哈特曼装置和戈德伯特-格林瓦尔德炉来评估最小点火能量和最小点火温度。利用高速摄像机分析锆粉云的火焰传播行为。实验结果表明，最小点火能量在1 mJ至3 mJ之间，最小点火温度为503 K。在0.7 MPa时，点火能量达到最小值30 mJ。考虑点火延迟时间影响的点火能量呈现出类似规律。最大火焰速度随分散压力的增加而增大。不过，在火焰传播初期，分散压力最低（0.4 MPa）时的瞬时火焰速度明显高于其他两种情况。
