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Insight into suppression performance and mechanisms of ultrafine powders on wood dust deflagration under equivalent concentration.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-03-28 , DOI: 10.1016/j.jhazmat.2020.122584 Chuyuan Huang 1 , Xianfeng Chen 1 , Bihe Yuan 1 , Hongming Zhang 2 , Sheng Shang 1 , Qi Zhao 1 , Huaming Dai 1 , Song He 1 , Ying Zhang 1 , Yi Niu 1
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-03-28 , DOI: 10.1016/j.jhazmat.2020.122584 Chuyuan Huang 1 , Xianfeng Chen 1 , Bihe Yuan 1 , Hongming Zhang 2 , Sheng Shang 1 , Qi Zhao 1 , Huaming Dai 1 , Song He 1 , Ying Zhang 1 , Yi Niu 1
Affiliation
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Flame propagation characteristics of wood dust deflagration and suppression mechanism of ultrafine powders are investigated systematically. The deflagration reaction intensity of wood dust increases firstly and then decreases with the increase in dust cloud concentration. This is due to factors such as oxygen supply, positive feedback among flame characteristic parameters. Thus, there is an equivalent dust concentration for greatest deflagration intensity. Nano-sized ultrafine zirconium hydroxide (Zr(OH)4) and silicon dioxide (SiO2) powder are introduced to suppress wood dust deflagration at the equivalent concentration. It is found that Zr(OH)4 has a suppression effect of endothermic decomposition to generate zirconia (ZrO2), dilution of oxygen and absorption of free radicals; while SiO2 exerts suppression effect due to its high melting point and heat absorption. The suppression performance of Zr(OH)4 is better than that of SiO2. This is because that Zr(OH)4 and ZrO2 have a catalytic carbonization effect. It can not only improve thermal stability of wood particles by catalyzing production of high-temperature resistant residuals, but also promote the formation of catalytic sites to reduce crystallite size of carbon layer on wood particles surface, weakening heat and mass transfer between particles.
中文翻译：
了解等效浓度下超细粉对木材粉尘爆燃的抑制性能和机理。
系统研究了木屑爆燃的火焰传播特性及超细粉的抑制机理。木屑的爆燃反应强度随粉尘浓度的增加先增大后减小。这是由于氧气供应，火焰特性参数之间的正反馈等因素造成的。因此，对于最大爆燃强度，存在相等的粉尘浓度。引入纳米级超细氢氧化锆（Zr（OH）4）和二氧化硅（SiO2）粉，以抑制木材粉尘在等效浓度下的爆燃。发现Zr（OH）4具有抑制吸热分解产生氧化锆（ZrO2），稀释氧气和吸收自由基的作用。SiO2的熔点高，吸热量大，因此具有抑制作用。Zr（OH）4的抑制性能优于SiO2。这是因为Zr（OH）4和ZrO2具有催化碳化作用。它不仅可以通过催化耐高温残留物的产生来提高木材颗粒的热稳定性，而且可以促进催化部位的形成，从而减小木材颗粒表面上碳层的微晶尺寸，从而减弱颗粒之间的热量和传质。
更新日期：2020-03-28
中文翻译：
了解等效浓度下超细粉对木材粉尘爆燃的抑制性能和机理。
系统研究了木屑爆燃的火焰传播特性及超细粉的抑制机理。木屑的爆燃反应强度随粉尘浓度的增加先增大后减小。这是由于氧气供应，火焰特性参数之间的正反馈等因素造成的。因此，对于最大爆燃强度，存在相等的粉尘浓度。引入纳米级超细氢氧化锆（Zr（OH）4）和二氧化硅（SiO2）粉，以抑制木材粉尘在等效浓度下的爆燃。发现Zr（OH）4具有抑制吸热分解产生氧化锆（ZrO2），稀释氧气和吸收自由基的作用。SiO2的熔点高，吸热量大，因此具有抑制作用。Zr（OH）4的抑制性能优于SiO2。这是因为Zr（OH）4和ZrO2具有催化碳化作用。它不仅可以通过催化耐高温残留物的产生来提高木材颗粒的热稳定性，而且可以促进催化部位的形成，从而减小木材颗粒表面上碳层的微晶尺寸，从而减弱颗粒之间的热量和传质。
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