粉尘云最小点火能测试方法的比较与分析

在1 2L哈特曼管、20L球、振动筛落管3种粉尘云最小点火能测试装置上对随时间和空间变化并对最小点火能测量有重要影响的湍流度、粉尘浓度和粉尘分散质量进行了定量测量和比较·在上述3种装置上借助最小点火能测试仪对粉尘云最小点火能进行了测量和比较,对影响最小点火能测量的因素进行了分析讨论·分析与测量表明:粉尘分散方法以及粉尘初始湍流度的大小对粉尘分散度影响很大;气流携带法(20L球)对粉尘的分散最好,堆积法(1 2L哈特曼管)次之,自由下降法(振动筛落管)最差·因此,振动筛落管不适宜作为最小点火能测试装置·

Comparison and Analysis of Different Testing Methods of Minimum Ignition Energy of Dust Cloud

The three important time/space-dependent influencing factors on the measurement of dust, were tested quantitatively by a 1.2L Hartmann bomb, 20L-sphere and vibratory sieving tube, as the testing apparatus for dust cloud, and the results were compared. Then, a special instrument was used together with the three apparatus to measure the minimum ignition energy of dust cloud, with the results also compared. Based on such results the influencing factors on the measurement of the minimum ignition energy were discussed. It was revealed that the great influencing factors on the dust dispersity are the way to disperse dust and the magnitude of initial turbulivity and, with respect to the dust dispersion effect, the air-borne dust by the 20L-sphere is the best and the dust-depositing by the 1.2L Hartmann bomb the second, with the free fall of dust by vibratory sieving tube the poor one. The fact implies that the vibratory sieving tube is improper to testing minimum ignition energy.