玉米淀粉粉尘爆炸特性及火焰传播过程的试验研究?

为了全面地认识玉米淀粉粉尘爆炸的敏感性和爆炸破坏效应,分别采用粉尘云着火温度装置、20 L球粉尘爆炸装置和粉尘云火焰传播装置对玉米淀粉的粉尘云着火温度、爆炸下限质量浓度、爆炸压力、爆炸氧极限浓度以及粉尘云火焰传播过程进行了研究。结果表明:玉米淀粉粉尘云最低着火温度在380~390℃之间;粉尘云爆炸氧极限浓度(体积分数)在10%~11%之间;爆炸下限质量浓度和最大爆炸压力随着化学点火具质量的增加而呈现出不同的变化特征,随着化学点火具质量的增加,玉米淀粉的爆炸下限质量浓度逐渐降低,而玉米淀粉爆炸压力逐渐升高。在不同的粉尘质量浓度条件下,粉尘云火焰传播速度和火焰温度有一定的变化,在粉尘质量浓度为500 g/m3时,火焰传播速度和火焰温度均达到最大值,分别为13.81 m/s和1 107℃。

Experimental Study on Explosion Characteristics and Flame Propagation Process of Corn Starch Dust

To investigate the explosion sensitivity and explosion damage effects of corn starch dust explosion, a dust cloud ignition temperature device, 20 L spherical dust explosion device and dust cloud flame propagation device were used respectively to study ignition temperature, explosion limit concentration, explosion pressure,limit oxygen concentration, and the flame propagation characteristics of dust cloud. Results indicate that the lowest ignition temperature of corn dust cloud is 380-390 ℃ . The limit oxygen concentration(volume fraction)of corn dust cloud is 10% -11% . With the increased of chemi-cal igniter quality, the lowest explosive limit concentration reduces, and the explosion pressure increases. Propagation speed and temperature of flame changes with different concentrations of dust cloud. In the concentration of 500 g/ m3 , the maximum propagation speed of flame front is 13. 81 m/ s and the highest flame temperature is 1107 ℃ .