The ignition and explosion of coal dust are significant hazards in coal mines. In this study, the minimum ignition temperature and energy of non-stick coal dust were investigated empirically at different working conditions to identify the key factors that influence the sensitivity and characteristics of coal dust explosions. The results showed that for a given particle size, the minimum ignition temperature of the coal dust layer was inversely related to the thickness of the coal dust layer. Meanwhile, when the layer thickness was kept constant, the minimum ignition temperature of the coal dust layer decreased with smaller coal dust particle sizes. Over the range of particle sizes tested (25–75 μm), the minimum ignition temperature of the coal dust cloud gradually increased when larger particles was used. At the same particle size, the minimum ignition temperature of the coal dust layer was much lower than that of the coal dust cloud. Furthermore, the curves of minimum ignition energy all exhibited a minimum value in response to changes to single independent variables of mass concentration, ignition delay time and powder injection pressure. The interactions of these three independent variables were also examined, and the experimental results were fitted to establish a mathematical model of the minimum ignition energy of coal dust. Empirical verification demonstrated the accuracy and practicability of the model. The results of this research can provide an experimental and theoretical basis for preventing dust explosions in coal mines to enhance the safety of production.

中文翻译：

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不粘煤尘爆炸的点火灵敏度特性变化

煤尘的着火和爆炸是煤矿的重大危害。在这项研究中，对不同工作条件下不粘煤尘的最低着火温度和能量进行了实验研究，以确定影响煤尘爆炸敏感性和特征的关键因素。结果表明，对于给定的粒径，煤尘层的最低着火温度与煤尘层的厚度成反比。同时，当层厚度保持恒定时，煤尘颗粒的最小着火温度随着煤尘颗粒尺寸的减小而降低。在测试的粒径范围（25–75μm）内，使用较大的颗粒时，煤尘云的最低着火温度逐渐升高。在相同的粒径下 煤尘层的最低着火温度远低于煤尘云的最低着火温度。此外，响应于质量浓度，点火延迟时间和喷粉压力的单个独立变量的变化，最小点火能量的曲线都呈现出最小值。还检查了这三个自变量的相互作用，并拟合了实验结果以建立煤粉最小点火能量的数学模型。实证验证表明了该模型的准确性和实用性。研究结果可为预防煤矿扬尘爆炸，提高生产安全性提供实验和理论依据。响应于质量浓度，点火延迟时间和喷粉压力的单个独立变量的变化，最小点火能量的曲线都呈现出最小值。还检查了这三个自变量的相互作用，并拟合了实验结果以建立煤粉最小点火能量的数学模型。实证验证表明了该模型的准确性和实用性。研究结果可为预防煤矿扬尘爆炸，提高生产安全性提供实验和理论依据。响应于质量浓度，点火延迟时间和喷粉压力的单个独立变量的变化，最小点火能量的曲线都呈现出最小值。还检查了这三个自变量的相互作用，并拟合了实验结果以建立煤粉最小点火能量的数学模型。实证验证表明了该模型的准确性和实用性。研究结果可为预防煤矿扬尘爆炸，提高生产安全性提供实验和理论依据。还检查了这三个自变量的相互作用，并拟合了实验结果以建立煤粉最小点火能量的数学模型。实证验证表明了该模型的准确性和实用性。研究结果可为预防煤矿扬尘爆炸，提高生产安全性提供实验和理论依据。还检查了这三个自变量的相互作用，并拟合了实验结果以建立煤粉最小点火能量的数学模型。实证验证表明了该模型的准确性和实用性。研究结果可为预防煤矿扬尘爆炸，提高生产安全性提供实验和理论依据。