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Explosive property and combustion kinetics of grain dust with different particle sizes

机译:不同粒径的粉尘的爆炸特性和燃烧动力学

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摘要

The effect of particle size on the combustion and explosion properties of grain dust is investigated by Hartmann tube, cone calorimeter (CC), and thermogravimetry (TG), it aims to provide fundamental experimental data of grain dust for an in-depth study on its potential risk. The fine-grain dust facilitates the decrease in the minimum ignition temperature (MIT) of dust layer and dust cloud, as well as the obvious increases in the maximum explosion pressure (climbs from 0.36 to 0.49 MPa) and pressure rising rate d /dt (rises from 6.05 to 12.12 MPa s ), leading to the increases in maximum combustion rate ( ) and combustion characteristic index , corresponding to the greater or severer potential risk. Because the corresponding to combustion increases from 106.05 (sample with a particle size of 180–1250 μm) to 153.45 kJ mol for the sample of 80–96 μm, the combustion process gradually transforms from diffusion-controlled into a kinetically controlled mode with the decreasing particle size of grain dust, together with the retardation of initially transient charring. It determines that the competition between the charring and combustion dominates the decomposition, and the combustion prevails for the coarse particle, while the charring controls the combustion for the fine-grain dust.
机译:利用Hartmann管,锥形量热仪(CC)和热重分析仪(TG)研究了粒径对谷物粉尘燃烧和爆炸特性的影响,旨在为谷物粉尘的深入研究提供基础实验数据。潜在风险。细粒尘埃有助于降低尘埃层和尘埃云的最低起燃温度(MIT),以及最大爆炸压力(从0.36到0.49 MPa的爬升)和升压速率d / dt(从6.05 MPa升高到12.12 MPa s),导致最大燃烧率()和燃烧特性指数增加,这对应于更大或更严重的潜在风险。因为对应的燃烧从106.05(粒径为180–1250μm的样品)增加到80.96μm的样品为153.45 kJ mol,所以燃烧过程逐渐从扩散控制转变为动力学控制模式,并逐渐减小。颗粒粉尘的颗粒尺寸,以及最初瞬态炭化的延迟。它确定了炭化和燃烧之间的竞争主导了分解,而粗颗粒则占主导地位,而炭化则控制了细粉尘的燃烧。

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