Research On The Sensitivity And Suppression Of Zirconium Dust Cloud Explosion

As a rare metal powder,zirconium powder is widely used in industrial production and military industry due to its excellent properties.However,due to its high activity and energy,zirconium powder has certain risks in its production,transportation,storage and use.At present,there are still insufficiency in the domestic and foreign research on the danger and protection of zirconium powder explosion.Therefore,the research on the sensitivity parameters of zirconium powder explosion and its explosion suppression method have considerable theoretical reference and practical application value.?1?In this paper,the MITTA minimum ignition temperature tester and 1.2L Hartmann tube are used to experimentally study the partial explosion sensitivity parameters of zirconium powder.The effect of inert powder on zirconium dust cloud was investigated by using various powder suppressant.Finally,the orthogonal experimental design principle is used to investigate the influence of various factors on the minimum ignition energy and the minimum ignition temperature of zirconium powder.Research indicates that:?2?The minimum ignition temperature of zirconium dust cloud gradually decreases at first with the increase of concentration and tends to be stable after.The effect of air humidity on the minimum ignition temperature of zirconium dust cloud is not significant.The zirconium dust cloud increases slightly with the increase of air humidity.The minimum ignition temperature of zirconium dust cloud is 365°C.?3?The minimum ignition energy of zirconium dust cloud decreases first with concentration and then increases slightly.It increases slightly with the increase of air humidity.The influence of air humidity on the minimum ignition energy of zirconium dust cloud is slightly larger than the minimum ignition temperature,and the minimum ignition energy of zirconium dust cloud is measured to be 6.39mJ.?4?The inerting effect of the powder suppressant on the minimum ignition temperature of zirconium dust cloud is NH₄H₂PO₄>NaCl>CaCO₃ from large to small.When the content of the anti-explosive agent is 50%,the minimum ignition temperature of the Zr-CaCO₃ dust cloud is 430°C,the minimum ignition temperature of the Zr-NaCl dust cloud is 510°C,and the minimum ignition temperature of the Zr-NH₄H₂PO₄ dust cloud is 740°C.?5?When the content is in the range of 0 to 30%,the inerting effect of the suppressor on the minimum ignition energy of the zirconium dust cloud is NaCl>NH₄H₂PO₄>CaCO₃from large to small.When the content of the suppressor is in the range of 30%to 50%,the inerting effect is in the order of NH₄H₂PO₄>NaCl>CaCO₃ from large to small.This difference is caused by the uniformity of mixing of the suppressor with the zirconium powder in the tube.When the content of the suppressor is 50%,the minimum ignition energy of Zr-CaCO₃ mixed dust cloud is 26.28mJ,the minimum ignition energy of Zr-NaCl mixed dust cloud is 209mJ,and the minimum ignition energy of Zr-NH₄H₂PO₄ mixed dust cloud is 250mJ.?6?The interactive orthogonal test of zirconium dust cloud shows that the factors affecting the minimum ignition temperature of zirconium dust cloud from strong to weak are:suppressor content>interaction between zirconium dust cloud concentration and suppressor content>interaction between zirconium dust cloud concentration and diffusion pressure>interaction between diffusion pressure and suppressor content>diffusion pressure>zirconium dust cloud concentration.In the experimental range,the content of the suppressor has a highly significant effect on the minimum ignition temperature of the zirconium dust cloud while the concentration of zirconium dust cloud has no such significance.The visual analysis of the orthogonal test results of the minimum ignition energy of zirconium dust cloud shows that the factors affecting the minimum ignition energy of zirconium dust cloud from strong to weak are:suppressor content>interaction between zirconium dust cloud concentration and suppressor content>zirconium dust cloud concentration.