煤粉粒径对粉尘爆炸影响试验研究与数值模拟

发布时间：2018-05-05 01:20

本文选题：粉尘粒径 + 爆炸压力　；参考：《中国安全科学学报》2017年01期

【摘要】：为分析煤粉粉尘的爆炸特性,利用20 L爆炸球测试装置与Fluent软件,试验研究煤粉粒径、质量浓度对煤粉云最大爆炸压力、爆炸指数的影响。结果表明,当试验环境温度为293~303 K时,点火能量为10 k J,粒径为26,73和115μm等3种粉尘云的最大爆炸压力均随着粉尘质量浓度的增加先升后降,在350 g/m3处达到最大值。同一粉尘质量浓度下,最大爆炸压力、爆炸指数均随着粒径的减小而增大。在60~120 ms时间内,粒径为26μm、质量浓度为350 g/m3的粉尘颗粒在球体内能保持一定的稳定状态,60 ms左右扩散达到相对均匀状态。爆炸后,燃烧最高温度为2 060 K,未燃区温度由300 K上升至375 K。粒径为26μm的煤粉尘云爆炸危险性等级为Ⅱ级,粒径为73和115μm的煤粉尘云爆炸危险性等级为Ⅰ级。
[Abstract]:In order to analyze the explosion characteristics of pulverized coal dust, the effect of coal particle size and mass concentration on the maximum explosion pressure and explosion index of pulverized coal cloud is tested by using 20 L explosion ball test device and Fluent software. The results show that when the test environment temperature is 293~303 K, the ignition energy is 10 K J, and the particle size is the maximum explosion of 26,73 and 115 micron m. The explosion pressure rises first and then decreases with the increase of dust concentration, and reaches the maximum at 350 g/m3. Under the same dust mass concentration, the maximum explosion pressure and the explosion index increase with the decrease of the particle size. In the time of 60~120 MS, the particle size is 26 mu m, and the dust particles with mass concentration of 350 g/m3 keep a certain stability in the inner energy of the sphere. The diffusion reached a relatively uniform state at about 60 ms. After the explosion, the maximum combustion temperature was 2060 K, the coal dust cloud explosion risk grade of the unburned area from 300 K to 375 K. to 26 mu m was grade II, and the coal dust cloud explosion risk grade of 73 and 115 micron m was grade I.

【作者单位】：江苏省危险化学品本质安全与控制技术重点实验室;南京工业大学安全科学与工程学院;
【基金】：国家自然科学基金资助(21576136)
【分类号】：TD714.5

【相似文献】