Numerical Simulation of Aluminite Dust Dispersion for Different Particle Sizes in 20 L Vessel
-
摘要: 20 L球型爆炸罐是用于测试粉尘爆炸特性参数的标准装置之一。粉尘颗粒在密闭空间内的运动规律,对于研究粉尘的最佳点火延迟时间段有重要的作用。基于计算流体力学理论,对20 L球型罐内的吹粉过程进行了数值模拟,监测了不同粒径的铝粉颗粒在20 L球型罐内的分散情况,对比了不同铝粉颗粒粒径在罐内的沉降时间。结果表明:粉尘沉降的时间段随粉尘粒径的增大而减小,颗粒大小超过一定尺寸时,铝粉将不能在密闭空间内均匀扩散。Abstract: 20 L spherical explosion tank is one of the standard devices used to test the dust explosion characteristics parameters.The motion law of dust particle in closed space is useful for the study of the best ignition delay time in dust explosion.The dust flow process in 20 L spherical tank was investigated by numerical simulation based on computational fluid mechanics theory.The dispersion condition of aluminite particle of different sizes was monitored, and the particle subsidence times of different sizes were compared.It is shown that the particle subsidence time decreases as the particle size increases.When the particle size is bigger than a certain degree, the dust will not disperse in the closed space.
-
Key words:
- 20 L vessel /
- dust explosion /
- numerical simulation /
- multiphase flow
-
表 1 监测点坐标
Table 1. The coordinates of monitoring points
Monitoring points Coordinates/(mm) Radius/(mm) a (0,146) 10 b (0,314) 10 -
[1] Liu Q M, Bai C H, Li X D, et al. Coal dust/air explosions in a large-scale tube[J]. Fuel, 2010, 89(2): 329-335. http://www.sciencedirect.com/science/article/pii/S0016236109003378 [2] 王绪友, 刘守华, 陈淮新.煤矿粉尘浓度比对性测量方案可行性探讨[J].工业计量, 2000(Suppl): 301-302. http://d.wanfangdata.com.cn/Periodical/gyjl2000Z1164Wang X Y, Liu S H, Chen H X. Feasibility study on the comparative metering schemes of coal mine dust concentration[J]. Industrial Metrology, 2000(Suppl): 301-302. (in Chinese) http://d.wanfangdata.com.cn/Periodical/gyjl2000Z1164 [3] Koichi I, Gotoh K, Higashitani K. Powder Technology Handbook[Z]. New York: Marcel Dekker Inc, 1991: 23-27. [4] 王福军.计算流体动力学分析[M].北京: 清华大学出版社, 2004.Wang F J. Computational Fluid Dynamics Analysis[M]. Beijing: Tsinghua University Press, 2004. (in Chinese) [5] 李新光, 张平, Radandt S, 等. 20 L球形装置上粉尘湍流速度的测量[J].东北大学学报(自然科学板), 2003, 24(10): 952-955. http://www.cnki.com.cn/Article/CJFDTotal-DBDX200310010.htmLi X G, Zhang P, Radandt S, et al. Measurement of turbulence velocity of dust in a 20 L-sphere[J]. Journal of Northeastern University(Natural Science), 2003, 24(10): 952-955. (in Chinese) http://www.cnki.com.cn/Article/CJFDTotal-DBDX200310010.htm [6] 尉存娟, 谭迎新, 路旭, 等.点火延迟时间对铝粉爆炸压力的影响研究[J].中北大学学报(自然科学板), 2009, 30(3): 257-260. http://d.wanfangdata.com.cn/Periodical/hbgxyxb200903013Yu C J, Tan Y X, Lu X, et al. Effect of the ignition delay time on the explosion pressure of aluminum dust[J]. Journal of North University of China(Natural Science Edition), 2009, 30(3): 257-260. (in Chinese) http://d.wanfangdata.com.cn/Periodical/hbgxyxb200903013