稻壳粉尘着火敏感性试验研究

Experimental study on ignition sensitivity of rice husk dust

为探究稻壳粉着火敏感性,利用激光粒度分析仪和SEM对其粒度进行分析及形貌表征,利用Godbert-Greenwald炉、固体自燃点、粉尘层最低着火温度测试仪对自燃点温度、最低着火温度进行试验研究。结果表明:稻壳粉颗粒越大粒度分布越集中;粉尘云最低着火温度随粒度的减小呈降低趋势;标准试验模式下,粒度D;=52.9μm的稻壳粉自燃点为225.1℃;粒度一定时,粉尘层最低着火温度随模具高度的增大而降低,当高度达到20 mm最低着火温度达到最低,且不再随模具高度的升高继续降低。本试验结果可为工业过程安全提供数据和理论支撑。

In order to study the ignition sensitivity of rice husk dust,the particle size and morphology of the rice husk dust were analyzed by laser particle size analyzer and SEM.The spontaneous combustion temperature,minimum ignition temperature were measured by Godbert-Greenwald furnace,solid spontaneous ignition point device and minimum ignition temperature of dust layer test device.The results indicated that the larger particle size of rice husk powder,the more concentrated the particle size distribution.The minimum ignition temperature of rice husk dust cloud decreases gradually with the decrease of dust particle size.The spontaneous combustion point of rice husk dust(D;=52.9μm)was 225.1℃under standard test mode.The minimum ignition temperature of rice husk dust layer decreases with the increase of mould height in the specific particle range when the particle size is the same.The minimum ignition temperature reaches the lowest as the mould height was 20 mm,and was no longer increasing with the increase of mould height.The test results can provide data and theoretical support for industrial process safety.