彩跑粉燃爆特性及抑爆实验研究

发布时间：2018-03-05 08:43

  本文选题：彩跑粉　切入点：最低引燃温度　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：彩跑粉又称彩色玉米粉,主要应用于彩虹跑活动和某些庆祝活动,由于彩跑粉调节了娱乐氛围,它才被大量商业或庆典活动使用。2015年台湾发生彩跑粉爆炸事故,伤亡人数达524人,一时间彩跑粉在庆典活动中被政府部门禁止使用。如果彩跑粉在能发挥原来功效的同时又不能发生爆炸危险,彩跑粉将会再次兴起。本文重点对彩跑粉的燃烧与爆炸特性以及其抑爆进行实验探索。首先对彩跑粉样品进行理化性能分析,包括粒度分布规律和元素含量分布;其次本文利用HY16429型粉尘云引燃温度实验测试装置,对彩跑粉样品的燃烧温度特性进行实验,考察粉尘云质量浓度、系统喷尘压力和色素三种因素对最低引燃温度的影响,揭示了彩跑粉的燃烧特性;第三,用20 L近球形爆炸测试实验系统对其进行了爆炸特性及Mg(OH)_2、Al(OH)_3和NaHCO_3三种粉体抑爆材料的抑爆实验,揭示了彩跑粉的爆炸特性和抑爆材料对其抑爆的效果,研究结果表明:(1)在不同喷尘压力条件下,粉尘云最低引燃温度随粉尘云质量浓度的增加先下降后上升,在2250-3500 g·m3的范围内达到最危险浓度;在粉尘云浓度不同的条件下,最低引燃温度随喷尘压力的增加先下降后上升,在60 kPa-80 kPa的范围内达到最低值,最低引燃温度值为均365 ℃;无色彩跑粉的引燃温度普遍低于含有色素的彩跑粉,含有色素的四种彩跑粉中,在500-4500 g·m-3浓度区间内,红色彩跑粉最低引燃温度变化幅度最大,当粉尘云浓度小于1000 g·m-3时可达475 ℃,达到最危险浓度时引燃温度为最低值365 ℃;蓝色彩跑粉粉尘云最低引燃温度随粉尘云质量浓度的变化相对比较稳定。(2)在粉尘云浓度为70 g·m-3的实验条件下,随着点火延迟时间的增加,粉尘云最大爆炸压力先增大后减小,60 ms时达到最佳点火延迟时间;粉尘云最大爆炸压力随初始点火能量的增大而增大,最低初始点火能量为4 kJ;粉尘爆炸压力-时间曲线被划分为压力上升阶段、压力峰值阶段和压力衰减阶段;无色彩跑粉粉尘云最大爆炸压力随粉尘云浓度的增加先增大后减小,当浓度达到190 g·m-3时为最危险浓度,此时爆炸压力达到最大值0.368 MPa;不同颜色的彩跑粉爆炸下限浓度各不相同,其中红色彩跑粉爆炸下限浓度最大(70-80 g·m-3),蓝色彩跑粉爆炸下限浓度最小(40-50 g·m-3)。(3)经测试,Mg(OH)_2、Al(OH)_3和NaHCO_3三种粉体抑爆材料均能有效的抑制粉尘爆炸,其抑爆效果:NaHCO_3Al(OH)_3Mg(OH)_2。本文所得数据和结论能为预防彩跑粉燃爆提供一定的理论指导,对可燃性粉尘行业的安全生产具有重要意义。
[Abstract]:Color running powder, also known as colored corn flour, is mainly used in rainbow running and some celebrations. Because it regulates the entertainment atmosphere, it is used in a large number of commercial or celebration activities. In 2015, Taiwan had an explosion of color running powder. The number of casualties reached 524. For a while, the government banned the use of the powder during the celebrations. If the powder can not be used in the same way as it used to work, but without the risk of explosion, Color running powder will rise again. This paper focuses on the combustion and explosion characteristics of color running powder and its explosion suppression. Firstly, the physical and chemical properties of color running powder samples are analyzed, including particle size distribution and element content distribution. Secondly, using HY16429 model dust cloud ignition temperature test device, the combustion temperature characteristics of the color powder sample were tested. The effects of three factors, such as dust cloud mass concentration, dust spray pressure and pigment, on the minimum ignition temperature were investigated. The combustion characteristics of the powder were revealed. Thirdly, the explosion characteristics of the powder were tested with a 20L near-spherical explosion test system, and the explosion suppression experiments of three kinds of powder explosive suppression materials, MgOHJ 2AlAlOHNi3 and NaHCO_3, were carried out. The explosion characteristics of the powder and the effect of the explosive suppression material on it are revealed. The results show that the minimum ignition temperature of the dust cloud decreases first and then rises with the increase of the mass concentration of the dust cloud under different dust-spray pressure. In the range of 2250-3500g 路m ~ 3, the lowest ignition temperature decreased first and then increased with the increase of dust pressure, and reached the lowest value in the range of 60 kPa-80 kPa, and the lowest ignition temperature was 365 鈩，

本文编号：1569531