Liu Tianqi, Mu Xiangzhen, Wu Xingchen, Jia Ruiheng, Xie Jining, Gao Zhongyi
School of Safety Engineering, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China.
Sci Rep. 2023 Sep 8;13(1):14804. doi: 10.1038/s41598-023-42117-x.
The ignition and explosion processes of suspended coal dust clouds and their suppression characteristics are important aspects of dust prevention and control. To understand the ignition temperature and explosion pressure of coal dust clouds, as well as the inhibitory effect of explosion suppressants, experimental tests are conducted. The study found that during the ignition process of coal dust clouds, the optimal dust spray pressure is 20 kPa, because coal dust clouds are more likely to ignite under this condition. When the mass concentration of coal dust cloud is 500 g m, the maximum pressure and maximum pressure rise rate are both the highest. When Al(OH) is mixed with coal dust and the mass percentage is 60%, the coal dust cloud can still be ignited. When KHPO is mixed with coal dust, the upper limit of the test temperature is reached when the percentage of mixture is 55%. When NHHPO is mixed with coal dust and the mass percentage is greater than 40%, the coal dust cloud can't be ignited anymore. The suppression effect of mixing Al(OH) and NHHPO is not as good as that of mixing KHPO and NHHPO.
悬浮煤尘云的着火与爆炸过程及其抑制特性是防尘与控尘的重要方面。为了解煤尘云的着火温度和爆炸压力，以及爆炸抑制剂的抑制效果，进行了实验测试。研究发现，在煤尘云着火过程中，最佳喷雾压力为20 kPa，因为在此条件下煤尘云更易着火。当煤尘云的质量浓度为500 g/m时，最大压力和最大压力上升速率均最高。当Al(OH)与煤尘混合且质量百分比为60%时，煤尘云仍能被点燃。当KHPO与煤尘混合时，混合比例为55%时达到测试温度上限。当NHHPO与煤尘混合且质量百分比大于40%时，煤尘云不再能被点燃。混合Al(OH)和NHHPO的抑制效果不如混合KHPO和NHHPO的抑制效果好。
